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WO2013187239A1 - Filtre à gaz, dispositif de moulage, capteur de mesure d'informations de l'intérieur de moule, procédé pour évacuer un gaz dans un moule et procédé de fabrication d'un produit moulé par injection - Google Patents

Filtre à gaz, dispositif de moulage, capteur de mesure d'informations de l'intérieur de moule, procédé pour évacuer un gaz dans un moule et procédé de fabrication d'un produit moulé par injection Download PDF

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Publication number
WO2013187239A1
WO2013187239A1 PCT/JP2013/064997 JP2013064997W WO2013187239A1 WO 2013187239 A1 WO2013187239 A1 WO 2013187239A1 JP 2013064997 W JP2013064997 W JP 2013064997W WO 2013187239 A1 WO2013187239 A1 WO 2013187239A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas
mold
gas filter
cavity
vent pipe
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2013/064997
Other languages
English (en)
Japanese (ja)
Inventor
岩本　典裕
俊 加藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DIRECT 21 Corp
Hitachi Astemo Ltd
Original Assignee
DIRECT 21 Corp
Keihin Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by DIRECT 21 Corp, Keihin Corp filed Critical DIRECT 21 Corp
Publication of WO2013187239A1 publication Critical patent/WO2013187239A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/06—Permanent moulds for shaped castings
    • B22C9/067—Venting means for moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/14—Machines with evacuated die cavity
    • B22D17/145—Venting means therefor

Definitions

  • the present invention relates to a gas filter that discharges gas from a die cavity of a die casting apparatus, gravity casting machine, low pressure casting machine, injection molding machine, etc., a mold apparatus using the gas filter, and a pressure of a molten metal in the mold Mold internal information measuring sensor suitable for judging the quality of casting / resin molded product by detecting the gas, method of venting gas from the mold cavity, and injection molding using the gas filter
  • the present invention relates to an injection molded product manufacturing method for manufacturing a product.
  • the quality of die-cast products is affected by the injection speed and injection pressure when filling a metal mold with molten metal.
  • the molten metal is supplied to the plunger sleeve, and the plunger is driven at a low injection speed to avoid entrainment of air in the molten metal, and the plunger sleeve and product liner are full.
  • the plunger moves to a position where the tip of the molten metal reaches the mold gate, the plunger is switched to a high injection speed and driven to rapidly fill the molten metal into the mold cavity.
  • the pressure of the plunger is increased to pressurize the molten metal.
  • a mold used for a die casting apparatus is composed of a movable mold 1a and a fixed mold 1b.
  • the cavity 2 formed by the two molds 1a and 1b is provided with a casting port 3a, a runner 3b, and a gate 3c following the injection cylinder, and further a gas vent passage 4 through which the gas in the cavity 2 is vented, a sump 5 is provided.
  • FIG. 23 is a cross-sectional view showing a state in which metal is filled in the cavity 2 of the mold in the die casting apparatus.
  • a predetermined amount of molten metal ML is supplied using a ladle through a pouring port 6 a of the plunger sleeve 6.
  • This figure shows a state where the plunger 7 is driven at a low speed and injected from a state where a predetermined amount of the molten metal ML is supplied into the plunger sleeve 6.
  • the gas G is present together with the molten metal ML in front of the plunger tip 7 a, and the gas G is also present in the runner 3 b that guides the molten metal ML in the plunger sleeve 6 to the cavity 2.
  • a position FP shown in FIG. 23 is a point at which the plunger 7 is switched from low speed movement to high speed movement.
  • the plunger tip 7a reaches this position FP, the molten metal ML is filled in the plunger sleeve 6 and the runner 3b.
  • This is the position where the tip of the molten metal ML reaches the gate 3c, that is, the filling start position where the filling of the molten metal ML into the cavity 2 is started.
  • the pressure of the molten metal in the mold, the temperature of the molten metal at the time of injection, the pressure of the gas in the cavity 2 compressed by filling the molten metal, etc. are measured. It is important for product quality control. If it is possible to determine whether or not the die-cast product has sufficient strength for each casting shot using these pieces of information, it is possible to prevent the defective product from flowing to the subsequent process, resulting in a yield. Can be improved.
  • a gas vent passage 4 is opened in the cavity 2 in advance, and by filling the cavity 2 with molten metal, the gas in the cavity 2 is extruded into the gas vent passage 4 and is released from the gas vent passage 4 to the atmosphere. ing.
  • the molten metal is transformed from a molten state to semi-molten with time, and further transformed into a solid.
  • filling the cavity 2 in the molten state by shortening the filling time leads to the production of good products. ing.
  • the molten molten metal injected into the cavity 2 enters the gas vent passage 4 and the gap between the molds, and generates burrs and flashes. Since such burrs and flashes hinder the production of cast products, the gaps between the molds and the gas vent passage 4 are made as narrow as possible.
  • the gas existing in the cavity should be exhausted in a short time as the molten metal is filled. If the gap is narrow, there is a possibility that the gas cannot be exhausted. The gas that could not be exhausted is caught in the product and becomes a trap, causing a product defect.
  • the thickness of the opening portion of the gas vent passage 4 is such that the molten metal at the end is cooled by the mold and solidified to seal the molten metal extruded later.
  • it is a narrowed portion of about 0.1 mm.
  • a seal portion (minimum clearance within a range in which the pressure pin can slide) is provided at the tip of the pressure pin, and the mold outside is provided behind the tip portion. It is described that a gas passage that communicates with the mold cavity is provided, the pressurizing pin is disposed at a final filling position in the mold cavity, and the inside of the mold cavity is directly pressurized and degassed in the cavity. Yes.
  • the present invention has been made paying attention to the above-mentioned problems, and is a gas filter capable of surely venting gas from inside a mold cavity, a mold apparatus using the same, and a mold internal information measuring sensor.
  • An object of the present invention is to provide a method for venting gas from a mold and a method for producing an injection molded product.
  • a mold internal information measurement sensor that can measure at least gas pressure reliably and accurately as information necessary to judge the quality of injection molded products filled in the mold cavity. The purpose is to do.
  • a gas filter according to the present invention is a gas filter that vents gas from a cavity of a mold, and is a slit-like space formed of metal and penetrating in an axial direction.
  • a bar-shaped member having a portion is provided.
  • the gas filter is made of metal and has a rod-shaped member having a slit-like space portion penetrating in the axial direction, so that heat transfer is high and the molten metal has a high cooling capacity. Can be solidified at the slit-shaped space, allowing only gas to pass through. In addition, since it is strong against thermal shock and has high strength, there is no risk of breakage. Therefore, the gas can be reliably vented from the cavity.
  • the slit-shaped space portion is one or a plurality of space portions cut out from the outer peripheral surface of the rod-shaped member toward the center portion.
  • the gas in the mold cavity can be surely vented through one or more spaces cut out from the outer peripheral surface of the rod-shaped member toward the center.
  • the slit-shaped space has a cross-sectional shape including a curved shape.
  • the cut distance can be increased, the volume of the slit space can be increased, and a large amount of gas in the cavity can be discharged reliably. Moreover, the strength of the rod-like member can be ensured.
  • the rod-shaped member is a plurality of tubes having a multiple tube structure, and the slit-like space portion is formed between the plurality of tubes.
  • the gas filter can solidify the molten metal and allow only the gas to pass through. Also, since the strength is high, the gas filter can surely perform degassing from the cavity of the mold.
  • an interval holding portion having a certain height from the outer peripheral surface is formed on the outer peripheral surface of each of the plurality of tubes.
  • the distance between the tubes can be made constant and the thickness of the slit-like space portion can be made constant.
  • an interval holding part having a certain height from the inner peripheral surface is formed on the inner peripheral surface of each of the plurality of tubes.
  • the distance between the tubes can be made constant and the thickness of the slit-like space portion can be made constant.
  • a plurality of the interval holding portions are formed along the axial direction.
  • gas can be easily passed in the axial direction.
  • a positioning member is inserted into a pipe having the smallest diameter among the plurality of pipes, and an overhang portion is provided on an outer peripheral surface on one end side of the positioning member. Is characterized in that a communication passage communicating with the slit-like space is formed.
  • the plurality of tubes can be positioned by the protruding portion of the positioning member, and a gas filter can be easily and accurately produced. Further, gas can be passed through the slit-shaped space portion and the communication path in the axial direction of the gas filter.
  • the mold apparatus according to the present invention is characterized in that the gas filter is disposed in a gas vent pipe communicating with a cavity of the mold.
  • the gas filter formed of metal since the gas filter formed of metal has high cooling capacity and strength, the gas filter is disposed in the gas vent pipe to reliably vent the gas from the mold cavity. be able to.
  • the switching valve connected to the degassing pipe, and a position of the degassing pipe between the position where the gas filter is disposed and the position where the switching valve is connected are provided by the switching valve.
  • the gas pressure in the gas vent pipe can be measured as the gas pressure in the cavity in a state where the gas vent pipe is shut off from the atmosphere by the switching valve, and the gas filter is used for purposes other than gas venting. Can also be used.
  • the gas filter includes a control means for determining clogging of the gas filter based on a decreasing gradient of the gas pressure measured by the gas pressure sensor.
  • clogging of the gas filter can be automatically determined.
  • an air source connected to the switching valve is provided, and the air source is compressed to the gas filter via the gas vent pipe when connected to the gas vent pipe by switching the switch valve. It is characterized by supplying air.
  • compressed air can be supplied to the gas filter, and the gas filter can be cooled and cleaned.
  • the vacuum tank includes a vacuum tank connected to the switching valve, and the vacuum tank is connected to the gas vent pipe by switching the switch valve via the gas vent pipe and the gas filter. The gas in the cavity is sucked in vacuum.
  • gas can be surely extracted from the cavity by vacuum suction using a vacuum tank.
  • a mold internal information measuring sensor includes a rod-shaped casing that can be mounted in a mounting hole that is drilled in a mold and opens in a cavity of the mold, and the above-described rod-shaped casing disposed at a tip of the rod-shaped casing.
  • the gas filter since the gas filter has high cooling capacity and strength, the gas in the cavity is introduced into the introduction chamber through the gas filter, and the pressure of the gas in the introduction chamber is detected, so that the inside of the cavity is surely and accurately.
  • the gas pressure can be measured.
  • the degassing method in the mold according to the present invention is a degassing method in the mold when the molten metal is filled in the cavity of the mold to produce an injection molded product, and communicates with the cavity.
  • the gas filter is arranged in a gas vent passage formed in the mold, and the gas in the cavity is vented through the gas filter.
  • degassing in the cavity of the mold can be reliably performed by degassing the cavity through the gas filter.
  • the method for producing an injection-molded product according to the present invention is an injection-molded product using the mold in which the gas filter is disposed in a gas vent pipe formed in the mold so as to communicate with a cavity of the mold.
  • the gas vent pipe is opened to the atmosphere or evacuated in the step of injecting molten metal into the cavity, and the gas in the cavity is released through the gas filter. It is characterized by that.
  • the gas filter since the gas filter has a high cooling capacity and strength, the gas can be surely vented from the cavity of the mold.
  • the compressed air is supplied to the gas filter when a release agent is applied to the cavity surface of the mold, when the mold is clamped, and when the mold is opened.
  • the gas filter can be cooled and cleaned, and it is possible to prevent clogging due to the release agent and water droplets adhering to the gas filter.
  • the gas pressure in the gas vent pipe is measured after the supply of the compressed air is completed.
  • the gas filter is made of metal and has a rod-shaped member having a slit-like space portion penetrating in the axial direction, so that heat transfer is high and the molten metal has a high cooling capacity.
  • the hot metal is solidified in the slit-shaped space, and only gas can be passed.
  • the gas can be reliably vented from the cavity of the mold.
  • FIG. 4 is a cross-sectional view taken along line B-B ′ of the tube shown in FIG. 3. It is a front view of the pipe
  • FIG. 6 is a sectional view taken along line C-C ′ of the tube shown in FIG. 5. It is a front view of a positioning member.
  • FIG. 8 is a cross-sectional view taken along line D-D ′ of the positioning member shown in FIG. 7. It is typical sectional drawing which shows the usage example of a gas filter.
  • FIG. 1 is a front view of a gas filter 50 according to an embodiment of the present invention
  • FIG. 2 is a cross-sectional view of the gas filter 50 taken along the line A-A ′.
  • the gas filter 50 is disposed in a passage leading to the cavity of the mold and is used for discharging the gas in the cavity.
  • the gas filter 50 has a multiple tube structure in which a plurality of tubes 51 and 52 and positioning members 55 having different diameters are concentrically arranged.
  • the tubes 51 and 52 and the positioning member 55 are made of metal.
  • the term “metal” refers to a substance that is understood in a broad sense, transfers heat well, has high strength, and is solid at room temperature.
  • FIG. 3 is a front view of the pipe 51 having the largest diameter
  • FIG. 4 is a cross-sectional view of the pipe 51 shown in FIG. 3 taken along the line B-B ′.
  • 5 is a front view of a small-diameter pipe 52 inserted through the pipe 51
  • FIG. 8 is a cross-sectional view of the positioning member 55 taken along the line D-D 'shown in FIG.
  • interval holding portions 53 having a certain height from the outer peripheral surface are arranged on the outer peripheral surfaces of the tubes 51 and 52 at equal intervals along the axial direction, and the tube 52 is inserted through the tube 51.
  • the interval holding part 53 of the tube 52 is in contact with the inner peripheral surface of the tube 51. Therefore, in a state where the tube 52 is inserted through the tube 51, a thin slit-like space portion 54 penetrating in the axial direction is formed between the tubes 51 and 52 as shown in FIG.
  • the positioning member 55 is made of beryllium steel in order to improve the cooling effect. As shown in FIGS. 1, 2, 7, and 8, the positioning member 55 has a cylindrical portion 55a. Similarly to the pipes 51 and 52, four interval holding portions 53 having a certain height from the outer peripheral surface are arranged at equal intervals along the axial direction on the outer peripheral surface of the cylindrical portion 55a. Is inserted into the tube 52, the interval holding portion 53 of the cylindrical portion 55 a comes into contact with the inner peripheral surface of the tube 52. On the outer peripheral surface on one end side of the cylindrical portion 55a, a projecting portion 55b is provided along the outer periphery. The overhanging portion 55b is provided with a slit-shaped communication path 55c cut out inward from the outer peripheral surface. In a state where the pipes 51 and 52 and the positioning member 53 are assembled to the gas filter 50, the communication passage 55 c and the slit-like space portion 54 communicate with each other and gas can be passed in the axial direction of the gas filter 50.
  • the pipes 51 and 52 When assembling the gas filter 50, when the pipes 51 and 52 are inserted through the positioning member 55, the pipes 51 and 52 can be positioned by the overhanging portion 55b, so that the gas filter 50 can be easily manufactured with high accuracy. Can do.
  • tubes 51 and 52 and the communicating path 55c of the positioning member 55 can also be formed by an etching, and can also be formed by wire cut electric discharge machining.
  • FIG. 9 is a schematic cross-sectional view showing a usage example of the gas filter 50.
  • the gas filter 50 shown in the figure has a cross section taken along the line A-A 'shown in FIG.
  • the gas filter 50 is disposed in a passage leading to the cavity of the mold.
  • the gas filter 50 is inserted into an outer cylinder holder having a diameter larger than that of the gas filter 50.
  • the inner diameter of the front end portion of the outer cylinder casing is larger than that of other portions, and the gas filter 50 is mounted and fixed to the enlarged diameter portion.
  • a small-diameter columnar member for performing load detection or temperature detection for example, is inserted into the central space of the gas filter 50.
  • An air passage is formed between the outer casing and the columnar member.
  • an outer cylinder holder is provided at the outermost periphery, a cylindrical member is provided at the center, and gas filters 50 are concentrically arranged between them to form a gas filter unit.
  • This gas filter unit is arranged at the end on the cavity side in the passage leading to the cavity of the mold.
  • the protruding portion 55b side of the gas filter 50 is disposed on the opposite side to the cavity side.
  • the interval holding portion 53 provided in the pipes 51 and 52 and the positioning member 55 has a height from the outer peripheral surface of the pipes 50a and 50b of 0.04 mm or more depending on the temperature, injection speed, pressure, etc. of the molten metal or the mold 12.
  • the thickness is preferably about 0.10 mm. With such a thickness, the thickness of the slit-shaped space portion 54 can also be set to about 0.04 mm to 0.10 mm, and when the molten metal enters the slit-shaped space portion 54 from the cavity, the molten metal tip is made of metal.
  • the pipes 50a and 50b formed in (1) are immediately cooled by the high heat transfer properties, and the molten metal solidifies before the molten metal flows out from the slit-shaped space 54 to the passage side. Thereby, the molten metal that has entered the slit-shaped space portion 54 does not flow out from the slit-shaped space portion 54 toward the passage, and the slit-shaped space portion 54 can pass only gas.
  • the communication passage 55c provided in the overhanging portion 55b of the positioning member 55 may be any one that allows gas to pass in the axial direction, and is not limited to a slit, and may be, for example, a through hole.
  • a space may be formed between the outside of the overhang portion 55b and the outer casing by reducing the amount of overhang of 55b.
  • the shape of the positioning member 55 is not limited to a cylindrical shape, and may be a columnar shape when a central space is not required.
  • the interval holding portion 53 is formed on the outer peripheral surface of each of the tubes 51 and 52 and the positioning member 55 has been described.
  • the number of the interval holding units 53 is not limited to four, and may be two, three, or five or more.
  • maintenance part 53 is not limited to the shape extended linearly in the axial direction of the gas filter 50, The distance of each pipe
  • maintenance part 53 may be helical shape. Further, the interval holding portion 53 may be provided only in the pipes 51 and 52, and the interval holding portion 53 may not be provided in the positioning member 55.
  • the gas filter 50 may be formed by using a multiple tube structure with a plurality of tubes having different diameters formed with the interval holding portion 53 without using the positioning member 55. (Modification of gas filter)
  • the configuration of the gas filter 50 described above is merely an example, and the gas filter may be a rod-shaped member that is formed of metal and has a slit-like space portion that penetrates in the axial direction.
  • FIG. 10 to 13 show modified examples of the gas filter.
  • FIG. 10 is a front view of a gas filter 50A according to a modification
  • FIG. 11 is a side view of the gas filter 50A.
  • the gas filter 50A has a cylindrical shape.
  • the gas filter 50A according to this modification is also made of metal.
  • 16 slits 56 that are notched linearly from the outer peripheral surface toward the center are formed at intervals of 22.5 °.
  • a plurality of linear slits 56 extend radially from the center to the circumferential side.
  • the slit 56 is composed of a long slit 56a and a short slit 56b having different lengths, and the long slit 56a and the short slit 56b are alternately formed.
  • FIG. 10 shows that shows that the gas filter 50A is viewed from the front.
  • each slit 56 has penetrated in the axial direction of the cylinder, and can let gas pass in the axial direction.
  • Each slit 56a, 56b has a thickness of about 0.4 mm to 1 mm as in the above-described embodiment.
  • the slit 56 constitutes a “slit-shaped space”.
  • Such a slit 56 can be formed by wire cutting, electric discharge machining, laser machining, or the like. Since the volume of the slit-shaped space portion can be made larger than that of the gas filter 50 by using the gas filter 50A as described above, heat transfer from the gas filter 50A to the molten metal that has entered the slit-shaped space portion is improved. And the cooling rate of the molten metal can be increased.
  • the number and length of the slits 56 described above are merely examples.
  • a plurality of slits having the same length may be provided, and the number of slits may be any number in consideration of air permeability and strength. Can do.
  • a space may be provided in the center of the gas filter 50A so that the gas filter 50A has a cylindrical shape.
  • FIG. 12 is a front view of a gas filter 50B according to another modification
  • FIG. 13 is a side view of the gas filter 50B.
  • the gas filter 50B according to this modification is also made of metal and has a cylindrical shape.
  • the shape and number of slits 57 provided in the gas filter 50B are different from the slits 56 provided in the gas filter 50A.
  • the front shape of the slit 57 in other words, the shape of the surface (cross section) cut in the direction perpendicular to the axial direction is linear at both ends, Has a semicircular shape.
  • the slits 57 are formed by cutting away from the outer peripheral surface toward the center at intervals of 45 degrees by wire cut electric discharge machining or the like.
  • the cut distance can be made longer than when the slit 57 is formed in a linear shape, so that the volume of the space formed by the slit 57 can be increased. Therefore, the amount of gas passing through the slit 57 can be increased, and a large amount of gas in the cavity 14 can be reliably discharged, heat transfer to the molten metal can be improved, and the molten metal can be immediately cooled. Further, the strength of the gas filter 50B can be ensured.
  • the other configuration of the gas filter 50B is the same as that of the gas filter 50A described above.
  • the cross-sectional shape of the slit 57 is not limited to the shape including the semicircular shape described above, and may be a shape including an arbitrary curved shape.
  • the shape of a slit is not limited to these modifications, It can be set as arbitrary shapes.
  • the shape seen from the front may have a spiral shape.
  • FIG. 14 is a schematic cross-sectional view of the die casting apparatus 10.
  • the die casting apparatus 10 has a mold 12 having a fixed mold 12a and a movable mold 12b.
  • a cavity 14 serving as a product mold is formed on the mating surface of the fixed mold 12a and the movable mold 12b.
  • a gate 16 for introducing the molten metal 28 extruded from the molten metal injection device 20 into the cavity 14 is connected and opened.
  • the molten metal injection device 20 is connected to the runner 17 of the mold 12 and includes a hollow sleeve 22 and a plunger 24 arranged in the sleeve 22.
  • a molten metal 28 is supplied into the sleeve 22 from a molten metal supply device (not shown), and the molten metal 28 is injected into the cavity 14 through the gate 16 by pushing out the plunger 24.
  • the plunger 24 is operated by an injection driving means (not shown).
  • the end of the movable mold 12b on the downstream side (upper position in FIG. 1) along the direction of hot water flow in the cavity 14 is aligned with the surface of the cavity 14, and the gas filter described above. 50 is arranged.
  • One end of a gas vent pipe 62 is connected to the end surface of the gas filter 50 opposite to the cavity 14 side, and the gas vent pipe 62 extends to the outside of the mold 12.
  • FIG. 15 is a schematic side view of a place where the gas filter 50 is installed.
  • the gas filter 50 is mounted in a holder 58 having a diameter larger than that of the gas filter 50, and the holder 58 is fixed to one end of the movable mold 12b on the cavity 14 side with a fastening screw.
  • One end face of the gas filter 50 is disposed on the same plane as the cavity 14 face, and the other end face is connected to the gas vent pipe 62 via the coupler 59.
  • the gas vent pipe 62 is formed of a vinyl tube. A space in the center of the gas filter 50 is closed by inserting a member (not shown).
  • the gas vent pipe 62 may be a copper pipe. In this case, the copper pipe may be brazed to the gas filter 50.
  • the gas vent pipe 62 extends to the outside of the mold 12.
  • the other end of the gas vent pipe 62 is connected to the switching valve 70.
  • a gas pressure sensor 72 that measures the gas pressure in the gas vent pipe 62 is provided in the middle of the gas vent pipe 62.
  • the switching valve 70 is connected to an air source 88 via an air adjustment unit 80. By switching the switching valve 70, the compressed air is supplied to the gas filter 50 by connecting the air source 88 and the gas vent pipe 62, or the gas vent pipe 62 is opened to the atmosphere and from the inside of the cavity 14 through the gas filter 50. The gas can be released or the gas vent pipe 62 can be shut off from the outside.
  • the switching valve 70 is a four-way four-port three-position solenoid valve in this embodiment.
  • the switching valve 70 includes a first solenoid 70a and a second solenoid 70b, and switches the position of the valve body by turning on (excitation) or turning off the first solenoid 70a and the second solenoid 70b.
  • the ON / OFF of the first solenoid 70a and the second solenoid 70b of the switching valve 70 is controlled by a control signal from the control device 40.
  • the switching valve 70 is closed and the gas vent pipe 62 is shut off from the outside.
  • the gas vent pipe 62 is opened to the atmosphere.
  • a vacuum tank 74 may be connected to the gas vent pipe 62 via the switching valve 70 to perform forced suction.
  • the air source 88 and the gas vent pipe 62 are connected, and the compressed air from the air source 88 is sent to the gas filter 50 through the gas vent pipe 62. 50 air blows are performed.
  • An air adjusting unit 80 provided between the air source 88 and the switching valve 70 includes an air filter 80a that removes water droplets and dust from the air, a regulator 80b that adjusts the pressure of the compressed air, and a mist in the compressed air. And a pressure gauge 80d. The air pressure from the air source 88 is adjusted and sent to the degassing pipe 62 side.
  • the control device 40 includes a CPU (not shown), a storage device such as a memory / hard disk, an input / output interface, a monitor device, and an internal clock, and the storage device is a program for performing various controls. And data are stored.
  • a CPU central processing unit
  • a storage device such as a memory / hard disk, an input / output interface, a monitor device, and an internal clock
  • the storage device is a program for performing various controls. And data are stored.
  • the control device 40 is electrically connected to each part such as the switching valve 70, the gas pressure sensor 72, the injection driving means of the molten metal injection device 20, and the CPU executes processing according to a program stored in the storage device.
  • each part such as the switching valve 70, the gas pressure sensor 72, the injection driving means of the molten metal injection device 20, and the CPU executes processing according to a program stored in the storage device.
  • a release agent is applied to the surface of the cavity 14 of the mold 12 by spraying (step S1). At this time, since the air blow of the gas filter 50 is performed, it is possible to prevent the release agent from adhering to the gas filter 50.
  • step S2 the movable mold 12b is moved to the fixed mold 12a side to perform mold clamping.
  • the gas pressure sensor 72 is used to measure the gas pressure drop gradient with the switching valve 70 closed, and the cooling liquid or spray liquid of the mold 12 enters the gas filter 50. Then, it is confirmed that the gas filter 50 is not clogged (step S3). Specifically, the second solenoid 70b is turned off and the switching valve 70 is closed. In this state, the gas pressure in the gas vent pipe 62 is measured by the gas pressure sensor 72 provided in the gas vent pipe 62, and the measurement result is transmitted to the control device 40. The control device 40 determines whether or not the gas filter 50 is clogged according to the decreasing gradient of the gas pressure measured by the gas pressure sensor 72.
  • the gas pressure decrease gradient is steeper than a preset gradient, and the gas pressure decreases rapidly, it is determined that the gas filter 50 is not clogged.
  • the gas pressure decrease gradient is gentler than the preset gradient and the pressure drop is slow, it is determined that the gas filter 50 is clogged.
  • the control device 40 When it is determined that the gas filter 50 is clogged, the control device 40 outputs an alarm and stops processing. On the other hand, when it is determined that the gas filter 50 is not clogged, the first solenoid 70a of the switching valve 70 is turned on to open the valve body that leads to the outside, and the gas vent pipe 62 is opened to the atmosphere. At this time, a vacuum tank 74 may be connected to the gas vent pipe 62 via the switching valve 70 to perform vacuum suction.
  • the molten metal is supplied from the molten metal injection device 20 into the sleeve 22 (step S4).
  • the plunger 24 is moved toward the mold 12 by the injection driving means, and the injection operation is started (step S5). As the plunger 24 moves, the molten metal is filled into the cavity 14.
  • the gas in the cavity 14 is passed through the communication path 55 c of the gas filter 50, the slit-shaped space 54, the gas vent pipe 62, and the switching valve 70. Released to the outside.
  • the molten metal enters the communication passage 55c and the slit-like space portion 54 of the gas filter 50.
  • the thickness of the slit-like space portion 54 is about 0.04 mm to 0.10 mm, and the gas filter 50 is made of metal. Therefore, the molten metal is immediately cooled in the slit-shaped space portion 54 and solidifies at the molten metal tip. For this reason, the molten metal does not flow into the degassing pipe 62 side, and only gas can be passed through the degassing pipe 62 side.
  • the gas filter 50 is made of metal, it has high strength and is more resistant to thermal shock than ceramics and is not likely to be damaged. Therefore, the gas is reliably vented through the gas filter 50 during injection. It is possible to manufacture a high-quality cast product without a nest inside.
  • the molten metal filled in the cavity 14 is cooled and solidified to form a cast product.
  • the mold is opened, and the cast product is taken out from the mold 12 (step S6).
  • the second solenoid 70b of the switching valve 70 is turned ON, compressed air is supplied from the air source 88 to the gas filter 50 via the switching valve 70, and the gas filter 50 is cooled and cleaned. Thereafter, the clogging of the gas filter 50 may be checked by measuring the gas pressure as in step S3. This completes the manufacturing process for one casting.
  • one degassing pipe 62 is provided in the mold 12 and one gas filter 50 is disposed in the degassing pipe 62 to degas the cavity 14.
  • a plurality of degassing pipes 62 may be provided in the mold 12, and the degassing filter 50 may be disposed in each degassing pipe 62 to degas the cavity 14.
  • the gas vent pipe 62 may be provided not only on the movable mold 12b but also on the fixed mold 12a.
  • FIG. 17 is a schematic cross-sectional view of a die casting apparatus 10A according to the second embodiment.
  • the die casting apparatus 10A according to the second embodiment measures a gas pressure, a molten metal pressure, a molten metal temperature, and the like inside the mold 12 with a mold internal information measurement sensor 100. The structure for doing is added.
  • a sensor mounting hole 64 that opens into the cavity 14 is formed through the mold 12.
  • the sensor mounting hole 64 is attached with a mold internal information measuring sensor 100 in which sensors for detecting each of gas pressure, molten metal pressure, and molten metal temperature are incorporated in one rod-shaped casing.
  • the sensor built into the mold internal information measuring sensor 100 may be a single sensor. Two types of sensors selected from a gas pressure sensor, a molten metal pressure sensor, and a molten metal temperature sensor are built into the rod, or three types of sensors are rodd. It is possible to appropriately take a form to be built in.
  • the peripheral region where the sensor mounting hole 64 of the cavity 14 opens is formed in a flat surface. Thereby, it can attach in the form with which the front end surface of the measurement rod 102 corresponds to the surface of the cavity 14.
  • FIG. 18 is a cross-sectional view of the mold internal information measuring sensor 100.
  • the gas filter 50 shown in the figure shows a cross section taken along line A-A 'shown in FIG.
  • the mold internal information measuring sensor 100 is inserted into the sensor mounting hole 64 and can be attached so that the tip end surface thereof coincides with the surface of the cavity 14, and a movable die provided at the base end of the measuring rod 102. And a sensor block 104 positioned outside the mold 12b.
  • a fixing unit 110 composed of a bite joint 106 and a set screw 108 is slidably attached to the outer peripheral portion of the measuring rod 102 so as to correspond to the length of the sensor mounting hole 64.
  • the position of the measuring rod 102 is adjusted according to the surface of the cavity 14, the set screw 108 is tightened in the sensor mounting hole 64, and the biting joint 106 is turned to bite into the outer peripheral surface of the measuring rod 102. 102 is fixed in place.
  • the measuring rod 102 has an outer cylinder casing 112 and a pressure transmission rod 114 arranged along the axial direction at the center thereof.
  • the pressure transmission rod 114 is a cylindrical body having an outer diameter smaller than the inner diameter of the outer cylinder casing 112, and an air passage 115 is formed between the outer cylinder casing 112 and the pressure transmission rod 114.
  • the inner diameter of the outer cylinder casing 112 is slightly increased, and the distal end of the pressure transmission rod 114 is also formed in a smaller-diameter cross section than the main body portion of the pressure transmission rod 114.
  • the above-described multi-tube structure gas filter 50 is mounted between the measurement rod 102 and the pressure transmission rod 114.
  • the gas filter 50 is mounted such that the protruding portion 55b side is disposed on the side opposite to the distal end side of the measuring rod 102.
  • the distal end surface of the measuring rod 102 is arranged on the outermost end surface of the outer cylinder casing 112, the central portion is the end surface of the pressure transmission rod 114, and the gas filter 50 is concentrically arranged between them.
  • a part of the surface of the cavity 14 can be configured by attaching to the surface. Since the gas filter 50 is provided with the slit-shaped space portion 54 and the communication passage 55 c that communicate with each other in the axial direction, the gas in the cavity 14 is separated from the molten metal by the gas filter 50 and can be introduced into the air passage 115. Yes.
  • the gas filter 50 having the above-described configuration for the mold internal information measuring sensor 100 it is more resistant to thermal shock than the case of using a porous filter such as ceramic, so that it is possible to prevent breakage while ensuring high air permeability. It is possible to introduce only the gas into the mold internal information measuring sensor 100 efficiently and reliably.
  • the base of the measuring rod 102 is attached to the sensor block 104.
  • the sensor block 104 has a rectangular block body 120 as shown in FIG.
  • the block main body 120 has a gas introduction chamber 122 formed in an opening on one surface, and a first sensor chamber 126 is formed on the opposite surface on the same axis with the partition wall 124 therebetween.
  • the partition wall 124 is formed with a through hole that communicates the gas introduction chamber 122 and the first sensor chamber 126.
  • the measuring rod 102 is attached to such a sensor block 104. That is, the base end portion of the outer cylinder casing 112 of the measuring rod 102 is attached to a casing attachment hole 122a formed in the inlet opening of the gas introduction chamber 122 of the block main body 120, and the outer periphery of the outer cylinder casing 112 and the block main body are mounted. The corner portion with 120 is joined by welding.
  • the base end of the pressure transmission rod 114 in the measuring rod 102 is longer than the outer cylinder casing 112, and this base end portion extends through the through hole of the partition wall 124 and extends to the first sensor chamber 126. .
  • the through hole supports the pressure transmission rod 114 with a bearing while sealing a gap with the pressure transmission rod 114 with an O-ring 130. Therefore, the pressure transmission rod 114 is supported at two points by the guide bush 118 provided at the inner periphery of the tip end portion of the outer cylinder casing 112 and the through hole provided in the partition wall 124 of the sensor block 104, and It can move in the axial direction inside.
  • the pressure transmission rod 114 receives pressure, the pressure transmission rod 114 is pressed in the axial direction and moved toward the opening side of the first sensor chamber 126 of the sensor block 104.
  • the pressure transmission block 134 and the load cell 136 are laminated on the end surface of the proximal end portion of the pressure transmission rod 114 so as to face each other.
  • the sensor block 104 has an opening of the first sensor chamber 126 facing the back surface of the load cell 136 so that the stacked pressure transmission block 134 and the load cell 136 are sandwiched between the pressure transmission rods 114.
  • a block lid 132 is attached.
  • the air passage 115 formed between the outer cylinder casing 112 of the measuring rod 102 and the pressure transmission rod 114 is communicated with the gas introduction chamber 122 inside the sensor block 104.
  • a second sensor chamber 138 communicating with the gas introduction chamber 122 is formed in the block outer peripheral surface.
  • a gas pressure sensor 140 is disposed in the opening of the second sensor chamber 138 so as to seal the opening.
  • the gas pressure sensor 140 for example, a piezoelectric load detection sensor using a ceramic piezoelectric element is used.
  • the second sensor chamber 138 is sealed with a sensor fixing bolt 144.
  • the gas in the cavity 14 introduced into the mold internal information measurement sensor 100 through the gas filter 50 on the distal end side of the measurement rod 102 passes from the gas introduction chamber 122 to the second sensor chamber 138 via the air passage 115.
  • the gas pressure sensor 140 measures the pressure.
  • a purge air introduction hole 146 is opened in the gas introduction chamber 122.
  • a compressed air supply pipe 148 is connected to the purge air introduction hole 146 so that compressed air can be supplied from the air source 88. Thereby, compressed air can be flowed to the gas filter 50 side via the gas introduction chamber 122, and the clogging of the gas filter 50 can be checked.
  • a pore 150 is formed in the axial core portion of the pressure transmission rod 114 described above.
  • the pore 150 is opened at the center of the tip of the pressure transmission rod 114, and this is used as a metal temperature detection end 151.
  • the metal temperature detection end 151 is made of an SKD material to prevent melting damage, and a detection portion of a thermocouple 152 is embedded.
  • a lead wire 158 of a thermocouple 152 is routed inside the pore 150, and the lead wire 158 is led out of the block through a cut groove 160 formed at the proximal end of the pressure transmission rod 114.
  • a terminal box 162 is attached to the sensor block 104, and various lead wires of the load cell 136, the gas pressure sensor 140, and the thermocouple 152 are led here. Then, each sensor is connected to a measuring instrument (not shown) via the terminal box 162, and the measuring instrument outputs predetermined measurement data, transmits it to the control device 40, and displays it on the display means as necessary. it can.
  • the mold internal information measurement sensor 100 is attached to the movable mold 12b, but may be attached to the fixed mold 12a.
  • step S0 the measuring rod 102 of the above-mentioned mold internal information measuring sensor 100 is inserted into the sensor mounting hole 64 of the movable mold 12b so that the tip surface of the measuring rod 102 is flush with the surface of the cavity 14. In the state, it is fixed by the fixing unit 110 of the sensor 100.
  • step S ⁇ b> 5 the metal pressure of the molten metal acts on the tip of the measuring rod 102 of the mold internal information measuring sensor 100 facing the cavity 14, and the pressure transmission rod 114 is pushed, and this force is applied by the load cell 136. Detected.
  • the gas inside the cavity 14 is introduced into the gas introduction chamber 122 through the gas filter 50 through the air passage 115 of the mold internal information measuring sensor 100, and the gas pressure is detected by the gas pressure sensor 140. Further, the molten metal temperature is detected by a metal temperature detection end 151 provided at the tip of the pressure transmission rod 114.
  • the metal gas filter 50 is more resistant to thermal shock than ceramics, so that it is not damaged and has a high cooling capacity. Therefore, only gas can be reliably introduced into the air passage 115, and the gas pressure in the cavity 14 can be measured reliably and accurately.
  • FIG. 20 is a schematic cross-sectional view of a die casting apparatus 10B according to the third embodiment.
  • the die casting apparatus 10B according to the third embodiment includes an exhaust side passage 18 that discharges gas in the cavity 14 from the exhaust side path 18 during injection, and the inside of the cavity 14
  • a shut valve 30 for closing the exhaust side passage 18 when the molten metal filling is completed, a mechanism for controlling the shut valve 30, and the like are provided.
  • an inlet sensor 26A for detecting that the molten metal has reached is disposed at the inlet of the cavity 14 in the gate 16 side passage.
  • an outlet sensor 26B that detects that the molten metal has reached is disposed at the outlet of the cavity 14 of the exhaust side passage 18.
  • the electrical conductivity of the molten metal 28 is used, and the molten metal 28 adheres to the front end surface of the molten metal detection sensor 26, so What is constituted may be used.
  • the difference between the time points when the molten metal is detected to reach the sensors 26A and 26B is the molten metal filling time from when the molten metal 28 flows into the cavity 14 until it is completely filled.
  • a shut valve 30 for opening and closing the exhaust side passage 18 is disposed downstream of the exhaust side passage 18.
  • the shut valve 30 shuts off the exhaust-side passage 18 as the molten metal filling time expires under the control of the control device 40 electrically connected to the shut valve 30.
  • the shut valve 30 is not limited to a drive type, but in this embodiment, the shut valve 30 is configured by an electromagnetically operated valve mechanism, and the passage is blocked by the valve body by energizing the operating coil.
  • the shut valve 30 has a spool 30b that is mounted so as to be reciprocally movable in the cylinder 30a, and drives the spool 30b to reciprocate by energizing and shutting off the electromagnetic coil 30c.
  • a poppet type valve element 30e is formed at the tip of the spool rod 30d. The poppet type valve element 30e faces the exhaust side passage 18 and is seated on a valve seat 30f formed on the wall surface of the exhaust side passage 18 to thereby form an exhaust side passage.
  • the shut valve 30 is normally configured as a normally open valve that opens the exhaust-side passage 18, and is driven by the control device 40 so that the molten metal 28 is closed when it reaches the outlet sensor 26B.
  • the shut valve 30 is provided with limit switches 34A and 34B for detecting a valve opening position for opening the exhaust side passage 18 to the atmosphere and a valve closing position for closing the passage 18 by the poppet type valve element 30e. .
  • the limit switches 34 ⁇ / b> A and 34 ⁇ / b> B detect the movement forward limit and the reverse limit of the spool 30 b and output detection signals to the control device 40.
  • the control device 40 stores the time difference at each time point when the detection signal is output from each of the inlet sensor 26A and the outlet sensor 26B as “molten metal filling time” in the memory.
  • a control signal for closing the shut valve 30 is transmitted to the shut valve 30, and then the spool 30 b of the shut valve 30 closes the exhaust side passage 18.
  • the time until the detection signal is received from the limit switch 34A after moving in the direction may be measured, and the time may be stored in the memory as the “operation delay time”.
  • the control device 40 measures the time from the time when the detection signal is received from the inlet sensor 26A, and when the “molten filling time” stored in the memory has elapsed, the shut valve 30 Is transmitted to the shut valve 30. Thereby, the spool rod 30d of the shut valve 30 is driven and the exhaust side passage 18 is closed.
  • the control device 40 starts from the “melt filling time” stored in the memory in advance from the time when the detection signal is received from the inlet sensor 26 ⁇ / b> A to the “operation delay time”.
  • the control signal may be transmitted when the time obtained by subtracting "" has elapsed.
  • the control device 40 measures the “melt filling time” and the “operation delay time” in the current injection operation, and the “melt filling time” and “operation delay time” stored in the memory at the measured times. Update.
  • the gas in the cavity 14 is vented using both the exhaust side passage 18 and the gas vent pipe 62 at the time of injection, and the shut valve 30 is closed when the molten metal is completely filled in the cavity 14. Therefore, the gas in the cavity 14 can be surely vented, and a high-quality cast product without a nest can be manufactured. Operations other than those described above are the same as in the second embodiment.
  • the gas pressure in the cavity 14 is measured using the mold internal information measuring sensor 100 at the time of injection, but the gas pressure in the cavity 14 is measured using the gas pressure sensor 72. May be.
  • the switching valve 70 is closed so that the gas in the gas vent pipe 62 does not leak to the outside, and the gas vent pipe 62 is removed from the atmosphere. It is necessary to measure in the blocked state.
  • a standard mode in which the gas pressure sensor 72 is used for degassing and a gas pressure measurement mode used in gas pressure measurement are selected on the graphic panel provided in the control device 40. For this purpose, a changeover switch may be provided.
  • control device 40 When the control device 40 detects that the gas pressure measurement mode has been selected by operating the changeover switch from the outside, the control device 40 transmits a control signal instructing switching to the closed state to the valve 70 at the start of injection. do it. And the control apparatus 40 should just receive the data of the gas pressure measured by the gas pressure sensor 72, and may display the peak pressure of the gas at the time of injection
  • gas filter 50 In the above-described embodiment, the example in which the gas in the cavity 14 of the die casting apparatus 10 is discharged using the gas filter 50 has been described.
  • the gas filters 50A and 50B may be used.
  • the apparatus which can use gas filter 50, 50A, 50B is not limited to the die-casting apparatus 10, For example, the gravity casting machine and low pressure casting machine which manufacture a casting, a resin molding, a plastic molding, etc.
  • the present invention can be applied to any apparatus equipped with a mold, such as an injection molding machine.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
PCT/JP2013/064997 2012-06-12 2013-05-30 Filtre à gaz, dispositif de moulage, capteur de mesure d'informations de l'intérieur de moule, procédé pour évacuer un gaz dans un moule et procédé de fabrication d'un produit moulé par injection Ceased WO2013187239A1 (fr)

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JP2012133323A JP6134974B2 (ja) 2012-06-12 2012-06-12 ガスフィルター、金型装置、金型内部情報計測センサー、金型内のガス抜き方法及び射出成形品製造方法
JP2012-133323 2012-06-12

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EP3653316A1 (fr) * 2018-11-14 2020-05-20 Meissner Ag Modell- Und Werkzeugfabrik Outil de coulée, par exemple outil à tirer les noyaux ou lingotière, ainsi que procédé de coulée correspondant

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JP6624442B2 (ja) * 2016-01-22 2019-12-25 株式会社デンソー 真空ダイカスト装置

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JP2003164959A (ja) * 2001-11-30 2003-06-10 Ryobi Ltd ダイカスト用ガス抜きプラグ
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