JP5651082B2 - Mold with seal plate and casting method using the same - Google Patents

Description

  The present invention relates to a mold used for vacuum die casting or the like, and more particularly to a mold with a seal plate provided with a seal plate for sealing between a plurality of molds and a casting method using the same.

  As this type of mold, there are known die casting molds consisting of a fixed mold, a movable mold, and a sliding mold. For example, the sliding mold is set by sliding the movable mold with respect to the movable mold, and then movable. Casting is performed in such a process that the die is combined with the fixed die together with the sliding die, and then the cavity formed therein is evacuated and then the molten metal is filled into the cavity. Such a mold employs a structure for sealing between the combined molds for the purpose of preventing air entrainment at the time of filling the molten metal.

  As the sealing structure, a structure (Patent Document 1) in which a seal member such as an O-ring is sandwiched between the mating surfaces of the fixed type and the movable type with respect to the sliding type is facilitated. However, with this structure, when an air leak occurs due to a problem with airtightness, it is difficult to specify the location of the leak, or the mold must be disassembled to replace the seal, which makes maintenance easier. There are disadvantages that are inferior. Thus, the sealing structure (Patent Documents 2 and 3) in which the boundary between the fixed mold and the movable mold is covered with a seal plate from the outside, and the seal member provided on the seal plate is pressure-bonded to the mold (Patent Documents 2 and 3). Since the work is performed on the seal plate, it is easy, and there is no problem in terms of maintainability.

JP 2004-337955 A Japanese Patent No. 3984836 JP 2005-014077 A

  In the sealing structure using the seal plate as described above, a gap under atmospheric pressure is generated between the seal plate and the sliding mold, and air leaks from the gap into the cavity to maintain the degree of vacuum of the cavity. The problem that it becomes difficult occurs. In addition, due to thermal deformation and wear of the fixed and movable molds, or low assembly accuracy, the mounting surfaces of the fixed and movable molds are not flush with each other. As a result, the hermeticity is impaired, which causes a problem that air leaks into the cavity.

  Therefore, an object of this invention is to provide the metal mold | die with a seal plate by which the leak of the air into a cavity is suppressed effectively, and the casting method using the same.

  The mold with a seal plate according to the present invention is incorporated by sliding in a direction intersecting with the movable mold forward and backward with respect to the movable mold, a movable mold provided to be movable relative to the stationary mold. And a cylinder rod connected to the sliding mold, and a cylinder that drives the sliding mold by expansion and contraction of the cylinder rod, and is movably engaged in the expansion and contraction direction of the cylinder rod. It is elastically biased in the moving direction by an elastic member and covers and seals the boundary between the fixed mold and the sliding mold in the mold clamping state and between the movable mold and the sliding mold. In the mold with a seal plate provided with a seal plate, a gap is formed between the sliding mold and the seal plate in the mold-clamping state, and among the fixed mold, the movable mold, and the seal plate Small Both the one and a gas passage communicating from the outside to the air gap is formed.

  According to the mold with a seal plate of the present invention, for example, the sliding mold is slid with respect to the movable mold and set, and then the movable mold is combined with the fixed mold together with the movable mold. The air in the gap formed between the sliding mold and the seal plate is sucked through the gas passage to evacuate the gap, so that air leaks from the gap into the cavity. It is suppressed and the vacuum degree of the cavity is maintained.

  Next, the casting method of the present invention is a casting method using the above-mentioned mold with a seal plate, and before opening the mold after casting, air is supplied from the gas passage to the gap to positively press the gap. Then, the mold is opened.

  According to the casting method of the present invention, after casting, air is supplied to the gap from the gas passage to make the gap positive pressure, and then the mold is opened to separate the seal plate from the fixed mold and the sliding mold. Inside air is released into the atmosphere. At this time, if there is an adhering substance (for example, dust or burrs) on the seal portion that is in close contact with the fixed mold and the movable mold of the seal plate, the adhering substance is blown off by the air released from the gap and removed. Accordingly, the sealing performance of the seal plate is maintained, and problems such as air leaking into the cavity are less likely to occur.

  The casting method of the present invention includes a form in which mold clamping is performed while air is supplied from the gas passage during mold clamping before casting. According to this embodiment, by performing mold clamping while supplying air, the air is supplied to the gap, and the adhering matter is removed from the seal portion, so that the sealing performance of the seal plate can be improved.

  According to the present invention, in the mold with a seal plate, it is possible to effectively suppress the leakage of air into the cavity from the gap between the seal plate and the sliding mold.

It is a partial longitudinal cross-sectional view which shows the structure of the metal mold | die which concerns on one Embodiment of this invention. It is an II arrow directional view of FIG. It is sectional drawing which shows the structure of the metal mold | die which concerns on one Embodiment, and the process of operation | movement from mold opening to mold clamping. It is a flow which shows 1 cycle of the casting operation by the metal mold | die which concerns on one Embodiment.

Hereinafter, an embodiment according to the present invention will be described with reference to the drawings.
(1) Mold Configuration FIG. 1 is a partial cross-sectional view showing a structure of a mold 1 with a seal plate for vacuum die casting according to an embodiment, and FIG. 2 is a view taken in the direction of arrow II in FIG. Both are clamped). FIG. 3 shows the operation process of the mold.

  The mold 1 has a fixed mold 10, a movable mold 20, and a sliding mold 30. The movable mold 20 is disposed above the fixed mold 10 in the drawing, and is movable up and down with respect to the fixed mold 10 by moving up and down. In the opposing surfaces of the fixed mold 10 and the movable mold 20, recesses 11 and 21 constituting the cavity C are formed, respectively. The recessed portion 11 of the fixed mold 10 is surrounded by an edge portion 12, and the inner surface of the edge portion 12 is tapered toward the front (the forward direction of the sliding mold 30: leftward in FIG. 1) as it goes downward. 12a.

  The recess 21 of the movable mold 20 is opened on the right side in FIG. 1, and the sliding mold 30 is slidably set toward the inside of the movable mold 20 in the opening 21 a. A guide portion 31 protrudes downward from the lower surface of the front end portion (left end portion in FIG. 1) of the sliding die 30 on the movable die 20 side. The rear surface of the guide portion 31 is formed as a tapered surface 31a that protrudes rearward (to the right in FIG. 1) as it goes upward.

  FIG. 3A shows a mold open state in which the movable mold 20 is separated from the fixed mold 10. When the sliding mold 30 is advanced while sliding in the movable mold 20 from this mold open state, the sliding mold 30 has a predetermined set in which the guide portion 31 is located on the inner side of the edge portion 12 of the fixed mold 10. Positioned in position. Next, as shown in FIGS. 3B to 3C, the movable mold 20 is moved forward (lowered) together with the sliding mold 30 toward the fixed mold 10, and the lower surface 20 a of the movable mold 20 and the sliding mold 30 are moved. When the lower surface 30 a is brought into close contact with the upper surface 12 b of the fixed mold edge 12, the mold is clamped, and a cavity C formed by combining the recesses 11 and 21 is formed in the mold 1.

  When the movable mold 20 advances toward the fixed mold 10, the tapered surface 31 a of the guide portion 31 of the sliding mold 30 slides along the tapered surface 12 a of the fixed mold 10 as shown in FIG. Then, only the sliding mold 30 further advances into the mold 1, and the lower surface 31b at the tip of the guide portion 31 comes into contact with the bottom surface 11a of the recess 11 of the fixed mold 10 as shown in FIG. Is completed.

  The sliding mold 30 is driven by a first cylinder 40 that is operated by fluid pressure such as hydraulic pressure. The cylinder rod 42 of the first cylinder 40 has boundaries 5, 6 between the fixed mold 10 and the sliding mold 30 in the clamped state and between the movable mold 20 and the sliding mold 30. A rectangular plate-like seal plate 50 that covers and seals is slidably engaged.

  The first cylinder 40 has a configuration in which a cylinder rod 42 is provided in a cylinder body 41 via a coupling 44 so that the cylinder rod 42 can extend and contract, and the cylinder rod 42 extends in parallel with the advancing / retreating direction of the sliding die 30. The tip is fixed to the lower part of the surface of the sliding mold 30. The cylinder rod 42 penetrates the seal plate 50, and the cylinder rod 42 and the seal plate 50 are relatively movable in the axial direction of the cylinder rod 42.

  A guide shaft 35 that is parallel to the cylinder rod 42 and extends to the outside is fixed to the sliding mold 30. The guide shaft 35 is disposed at a position appropriately spaced upward from the cylinder rod 42, and the seal plate 50 is slidably engaged with the guide shaft 35. The seal plate 50 is guided by the guide shaft 35 and the cylinder rod 42 and is parallel to the sliding direction of the sliding mold 30 with respect to the movable mold 20 so as to be in contact with and away from the opening 21a of the movable mold 20 in the clamped state. It is movable.

  O-rings 51 and 52 for sealing the gap are mounted on the inner peripheral surfaces of the through holes 50a and 50b through which the cylinder rod 42 and the guide shaft 35 penetrate the seal plate 50, respectively. Further, a cooling pipe 36 that cools the inside of the sliding mold 30 is fixed to the guide shaft 35 so as to penetrate therethrough. The cooling pipe 36 reaches the inside of the sliding mold 30, and the cooling medium is supplied from the cooling pipe 36 to the inside of the sliding mold 30.

  A seal material 53 is attached to the outer peripheral portion of the inner surface of the seal plate 50 on the sliding mold 30 side. The seal plate 50 is driven by a second cylinder 60 that is operated by fluid pressure such as hydraulic pressure. The cylinder body 41 of the second cylinder 60 is integrated with the cylinder body 41 of the first cylinder 40 that drives the sliding mold 30. The second cylinder 60 has a cylinder rod 62 parallel to the cylinder rod 42 of the first cylinder 40, and the tip of the cylinder rod 62 that expands and contracts is fixed to the surface of the seal plate 50. The seal plate 50 is guided by the guide shaft 35 and the cylinder rod 42 by the expansion and contraction of the second cylinder 60, and is driven so as to be in contact with the opening 21a of the movable mold 20 in the mold-clamped state as described above. Is done.

  When the cylinder rod 62 of the second cylinder 60 extends in the mold clamping state, the seal plate 50 comes close to the opening 21a, and the seal member 53 eventually presses against the outer surfaces of the fixed mold 10 and the movable mold 20. As a result, as shown in FIG. 2, the boundary 5 between the fixed mold 10 and the sliding mold 30 and the boundary 6 between the movable mold 20 and the sliding mold 30 are surrounded by the inside of the seal member 53. In this state, it is covered with a seal plate 50 and sealed.

  A spring 70 is disposed on the surface of the sliding mold 30 to elastically contact the seal plate 50 when the seal plate 50 comes close to the opening 21a. The seal plate 50 is elastically energized by the spring 70 in the direction away from the second cylinder 60, that is, away from the opening 21a, and can float, and the cylinder rod of the second cylinder 60 resists the energizing force. When 62 extends, the seal plate 50 is pressed against the outer surfaces of the fixed mold 10 and the movable mold 20, and the seal member is pressed against the outer surfaces of the fixed mold 10 and the movable mold 20.

  As shown in FIG. 1, when the mold 1 is clamped, a gap 7 is generated between the seal plate 50 and the sliding mold 30. The movable mold 20 is formed with a gas passage 22 that communicates the gap 7 with the outside. The gas passage 22 is formed in an L shape from the lower surface 21 a to the outer surface 21 b of the movable mold 20, and the air in the gap 7 is sucked into the opening of the gas passage 22 through the pipe 23 to be evacuated. On the contrary, air supply / exhaust means (not shown) for supplying air into the gap 7 is connected.

(2) Casting The above is the configuration of the mold 1 of one embodiment, and then the casting operation by the mold 1 will be described with the flow of FIG. First, as shown in FIG. 3A, from the standby state in which the movable mold 20 is retracted from the fixed mold 10, the sliding mold 30 slides to the left in the figure along the movable mold 20 by the first cylinder 40. The guide portion 31 of the sliding die 30 is positioned at a predetermined set position located inside the edge portion 12 of the fixed die 10.

  Next, the movable mold 20 moves forward (down) together with the sliding mold 30 toward the fixed mold 10 side. Then, as shown in FIGS. 3B to 3C, the tapered surface 31a of the guide portion 31 of the sliding mold 30 slides along the tapered surface 12a of the fixed mold 10, and only the sliding mold 30 is the mold. Go further in 1. Then, the sliding mold 30 is matched with the fixed mold 10 to complete the mold clamping, and the cavity C is formed in the mold 1.

  Subsequently, the seal plate 50 is moved to the sliding mold 30 side by the second cylinder 60 and pressed against the outer surfaces of the fixed mold 10 and the movable mold 20, and the sealing material 51 is pressed against the outer surface. Thereby, the boundary 5 between the fixed mold 10 and the sliding mold 30 in the clamped state and the boundary 6 between the movable mold 20 and the sliding mold 30 are surrounded by the inside of the seal member 53. Thus, the inside of the mold 1 is sealed with the seal plate 50.

  Next, the air in the cavity C is sucked and vacuumed, and the air in the gap 7 is sucked and vacuumed. Thereafter, the molten metal is filled in the cavity C in the mold 1 and casting is performed.

  When the casting is completed, air is then supplied from the gas passage 22 into the gap 7 to set the gap 7 to a positive pressure, and then the seal plate 50 is moved backward to move away from the fixed mold 10 and the movable mold 20 to open the opening 21a. To do. Further, the movable mold 20 and the sliding mold 30 are both raised and separated from the fixed mold 10 to make the mold open, and finally the sliding mold 30 is retracted to the standby position. In this state, the cast product can be taken out.

  The above is one cycle of the casting operation by the mold. In casting, the mold 1 is heated and adjusted to a predetermined casting temperature in advance.

  According to the mold 1 of the above-described embodiment, the air in the gap 7 formed between the sliding mold 30 and the seal plate 50 is sucked through the gas passage 22 after the clamping state is obtained. By evacuating the gap 7, air leakage from the gap 7 into the cavity C is effectively suppressed, and the degree of vacuum of the cavity C is maintained.

  In addition, after casting, air is supplied from the gas passage 22 to the gap 7 to make the gap 7 positive pressure, and then the seal plate 50 is separated from the fixed mold 10 and the sliding mold 30. Air is released into the atmosphere. At this time, if there are deposits (for example, dust or burrs) on the seal portion of the seal plate 50 that is in close contact with the fixed mold 10 and the movable mold 20, the deposits are blown away by the air released from the gap 7 and removed. Is done. Accordingly, the sealing performance of the seal plate 50 is maintained even during the next casting, and the problem that air leaks into the cavity C is less likely to occur.

  Further, since the seal plate 50 is attached by the spring 70 so as to float, the thermal expansion of the sliding mold 30 is absorbed by the spring 70 and does not affect the seal plate 50. For this reason, the reliable sealing state by the seal plate 50 is maintained. Also, in the casting cycle, after removing the molded product from the mold after opening the mold, blow is applied to the cavity C to apply a release agent and remove burrs. There is. Therefore, even when the mold is clamped, the deposits can be removed by supplying air from the gas passage 22 to the gap 7, and the sealing performance of the seal plate 50 can be improved.

  In the above embodiment, the gas passage is formed in the movable mold 20. However, the present invention is not limited to this, and the gas passage communicating with the gap 7 from the outside may be the fixed mold 10, the movable mold 20, or Any form may be used as long as it is formed on at least one of the seal plates 50.

DESCRIPTION OF SYMBOLS 1 ... Mold with seal plate 5, 6 ... Boundary 7 ... Gap 10 ... Fixed mold 20 ... Movable mold 22 ... Gas passage 30 ... Sliding mold 40 ... First cylinder 42 ... Cylinder rod 50 ... Seal plate 70 ... Spring (elastic) Element)
C ... Cavity

Claims (3)

Fixed type,
A movable mold provided to be movable forward and backward with respect to the fixed mold;
A sliding mold that is incorporated by sliding in the direction intersecting the advancing and retreating direction of the movable mold with respect to the movable mold;
A cylinder rod connected to the sliding mold, and a cylinder for driving the sliding mold by expansion and contraction of the cylinder rod;
The cylinder rod is movably engaged in the expansion / contraction direction and is elastically biased in the movement direction by an elastic member, between the fixed mold and the sliding mold in a mold-clamping state, and the movable mold A seal plate that covers and seals each boundary between the sliding molds;
In a mold with a seal plate with
In the clamping state, a gap is formed between the sliding mold and the seal plate,
A mold with a seal plate, wherein a gas passage communicating with the gap from the outside is formed in at least one of the fixed mold, the movable mold, and the seal plate. A casting method using the mold with a seal plate according to claim 1,
A casting method using a mold with a seal plate, wherein the mold is opened after air is supplied to the gap from the gas passage and the gap is set to a positive pressure before mold opening after casting.   3. The casting method using a mold with a seal plate according to claim 2, wherein the mold is clamped while air is supplied from the gas passage at the time of mold clamping before casting.

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