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US2792915A - Speed control of actuating element in die casting and injection moulding machines - Google Patents

Speed control of actuating element in die casting and injection moulding machines Download PDF

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Publication number
US2792915A
US2792915A US489705A US48970555A US2792915A US 2792915 A US2792915 A US 2792915A US 489705 A US489705 A US 489705A US 48970555 A US48970555 A US 48970555A US 2792915 A US2792915 A US 2792915A
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United States
Prior art keywords
pass
cylinder
die casting
injection moulding
actuating element
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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.)
Expired - Lifetime
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US489705A
Inventor
Smith Stanley
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E M B CO Ltd
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E M B CO Ltd
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Publication date
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/06—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam
    • F15B11/072—Combined pneumatic-hydraulic systems
    • F15B11/076—Combined pneumatic-hydraulic systems with pneumatic drive or displacement and speed control or stopping by hydraulic braking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/53—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
    • B29C45/531—Drive means therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41527—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a directional control valve
    • F15B2211/41536—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a directional control valve being connected to multiple ports of an output member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/421—Flow control characterised by the type of actuation mechanically
    • F15B2211/423—Flow control characterised by the type of actuation mechanically manually, e.g. by using a lever or pedal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/625—Accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7055—Linear output members having more than two chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/75—Control of speed of the output member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/885—Control specific to the type of fluid, e.g. specific to magnetorheological fluid
    • F15B2211/8855—Compressible fluids, e.g. specific to pneumatics

Definitions

  • This invention relates to die casting and injection moulding machines of the kind in which the molten metal or plastic material is forced into a die under the action of a plunger which is actuated by compressed air, the rate of movement of the plunger during the operative stroke being regulated by a hydraulic control means.
  • the said invention comprises the combination of a cylinder having a port at each end and an intermediate port, a piston slidable in the cylinder and adapted to control the intermediate port, an oil or other liquid reservoir in communication with the cylinder through one of the end ports, a by-pass arranged between the other two ports, an adjustable valve in the by-pass, a nonreturn valve between the by-pass and the intermediate port, and a second non-return valve between the by-pass and the reservoir.
  • the present invention relates to a modification of the invention above specified whereby the position of the piston at which the change from slow to rapid movement can be varied, and whereby the rate of the slow motion can be varied.
  • the present invention comprises a mechanism as above specified in which the cylinder consists of an angularly adjustable sleeve having therein a plurality of ports situated in different positions along the sleeve, any one of which'can be put into communication with the by-pass by angular movement of the sleeve, and an additional valve for controlling the rate of flow through the by-pass.
  • Figure 1 is a sectional side elevation of a hydraulic control means embodying the invention
  • Figure 2 is a cross-section on the line 2--2 of Figure 1.
  • the machine shown in the drawings comprises an operating cylinder a in which the motive fluid employed is compressed air.
  • This cylinder contains a piston b adapted to actuate the injection plunger (not shown) of the machine. From one side of the piston b extends a rod 1 carrying another piston g which is contained in the cylinder h of the hydraulic control means.
  • a reservoir 1' for oil or other liquid On a hollow body part h containing the cylinder h is arranged a reservoir 1' for oil or other liquid, and in the reservoir is contained a by-pass j which is in communication with the reservoir, and which can interconnect an end port k and any one of a plurality of intermediate ports 5 in the cylinder through the medium of a pair of ports m, m in the body part, the last mentioned ports being adapted to communicate respectively with opposite ends of the by-pass.
  • Communication between the by-pass and the port m is controlled by a nonreturn valve n loaded by a spring 0, and in the by-pass is contained a rotary regulating valve p which carries a non-return valve q loaded by a spring r ( Figure 2), this valve being adapted to allow liquid to pass from the reservoir to the by-pass.
  • the valve p is operable by a hand lever s.
  • a port u which may be open to the reservoir, but which is preferably adapted to communicate with the reservoir under the control of a non-return valve v loaded by a spring w.
  • the cylinder h containing the piston g consists of a sleeve which is angularly movable about its axis within the body part of the mechanism, the angular movement of the sleeve being efiected by a manually-operable worm 3 engaging a'worm wheel 4 formed on the exterior of the sleeve.
  • the intermediate ports 5 in the cylinder are disposed along an oblique line, that is to say, they are longitudinally and angularly spaced, and in the body part is formed a longitudinal channel 6 adapted to communicate with the by-pass through the port m and non-return valve n.
  • angular movement of the sleeve any one of its ports 5 can be moved into coincidence with the channel 6, thus enabling the position of the piston g at which liquid can pass from one end of the cylinder h to the other through the by-pass i to be varied.
  • the length of travel of the piston during the slowmotion phase of its movement can be varied to suit diflerent working conditions.
  • the rotary regulating valve p in the by-pass i which controls the rate of movement of the piston during the fast-motion phase is made hollow, and within it is contained a cylindrical and angularly adjustable valve 7 which is independently adjustable by hand-lever 8 for controlling the rate of flow of liquid from the right hand end of the cylinder h through the passageway 9 to the reservoir i, during the slow-motion phase of movement of the piston g.
  • the mechanism forming the subject of the above mentioned patent can be adapted in a simple and convenient manner to suit a wide variety of dilferent working conditions.
  • hydraulic control means comprising in combination a cylinder in the form of an angularly adjustable sleeve having therein a port at each end and a plurality of longitudinally and angularly spaced intermediate ports, means for imparting angular adjusting movements to the sleeve, a piston slidable in the cylinder and adapted to control any one of the intermediate ports depending on the angular position of the sleeve, an oil or other liquid reservoir in communication with the cylinder through one of the end ports, a by-pass arranged between the other end port and the intermediate port under the control of the piston, an adjustable valve in the by-pass, a non-return valve between the bypass and the intermediate port under the control of the piston, a second non-return valve between the by-pass and the reservoir, and an additional valve for controlling the rate of liquid flow through the by-pass.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Description

lTH 2,792,915 SPEED CONTROL OF ACTUATING ELEMENT IN DIE CASTING AND INJECTION MOULDING MACHINES Filed Feb. 21, 1955 2 Sheets-Sheet 1 S. SM
May 21, 1957 X S l 4; k/
EL/ I1 D fiv w m A 7 N F fl'nveni'or 6 02/6610 May 21. 1957 5. SMITH 2,792,915
SPEED CONTROL OF ACTUATING ELEMENT IN DIE CASTING AND INJECTION MOULDING MACHINES Filed Feb. 21, 1955 2 Sheets-Sheet 2 asm h tiwfl' 1322 zitjz/ United States Patent SPEED CONTROL OF ACTUATING ELEMENT IN DIE CASTING AND INJECTION MOULDING MACHINES Stanley Smith, Sutton Coldfield, England, assignor to E. M. B. Company Limited, West Bromwich, England Application February 21, 1955, Serial No. 489,705
Claims priority, application Great Britain March 19, 1954 3 Claims. (Cl. 188--97) This invention relates to die casting and injection moulding machines of the kind in which the molten metal or plastic material is forced into a die under the action of a plunger which is actuated by compressed air, the rate of movement of the plunger during the operative stroke being regulated by a hydraulic control means.
In the specification of United States Patent No. 2,720,946, I have described an invention whereby the hydraulic control means is adapted to effect a slow movement of the injection plunger during the initial part of its stroke, which movement is followed by movement of the plunger at a high rate of speed.
The said invention comprises the combination of a cylinder having a port at each end and an intermediate port, a piston slidable in the cylinder and adapted to control the intermediate port, an oil or other liquid reservoir in communication with the cylinder through one of the end ports, a by-pass arranged between the other two ports, an adjustable valve in the by-pass, a nonreturn valve between the by-pass and the intermediate port, and a second non-return valve between the by-pass and the reservoir.
The present invention relates to a modification of the invention above specified whereby the position of the piston at which the change from slow to rapid movement can be varied, and whereby the rate of the slow motion can be varied.
The present invention comprises a mechanism as above specified in which the cylinder consists of an angularly adjustable sleeve having therein a plurality of ports situated in different positions along the sleeve, any one of which'can be put into communication with the by-pass by angular movement of the sleeve, and an additional valve for controlling the rate of flow through the by-pass.
In the accompanying drawings Figure 1 is a sectional side elevation of a hydraulic control means embodying the invention, and Figure 2 is a cross-section on the line 2--2 of Figure 1.
The machine shown in the drawings comprises an operating cylinder a in which the motive fluid employed is compressed air. This cylinder contains a piston b adapted to actuate the injection plunger (not shown) of the machine. From one side of the piston b extends a rod 1 carrying another piston g which is contained in the cylinder h of the hydraulic control means.
On a hollow body part h containing the cylinder h is arranged a reservoir 1' for oil or other liquid, and in the reservoir is contained a by-pass j which is in communication with the reservoir, and which can interconnect an end port k and any one of a plurality of intermediate ports 5 in the cylinder through the medium of a pair of ports m, m in the body part, the last mentioned ports being adapted to communicate respectively with opposite ends of the by-pass. Communication between the by-pass and the port m is controlled by a nonreturn valve n loaded by a spring 0, and in the by-pass is contained a rotary regulating valve p which carries a non-return valve q loaded by a spring r (Figure 2), this valve being adapted to allow liquid to pass from the reservoir to the by-pass. The valve p is operable by a hand lever s. Further there is provided at the end of the cylinder h remote from the port k a port u which may be open to the reservoir, but which is preferably adapted to communicate with the reservoir under the control of a non-return valve v loaded by a spring w.
The mechanism so far described is essentially similar to that described in the specification of the above mentioned patent, but differs therefrom in the form of the cylinder h and the plurality of intermediate ports 5 therein.
The cylinder h containing the piston g consists of a sleeve which is angularly movable about its axis within the body part of the mechanism, the angular movement of the sleeve being efiected by a manually-operable worm 3 engaging a'worm wheel 4 formed on the exterior of the sleeve.
The intermediate ports 5 in the cylinder are disposed along an oblique line, that is to say, they are longitudinally and angularly spaced, and in the body part is formed a longitudinal channel 6 adapted to communicate with the by-pass through the port m and non-return valve n. By angular movement of the sleeve any one of its ports 5 can be moved into coincidence with the channel 6, thus enabling the position of the piston g at which liquid can pass from one end of the cylinder h to the other through the by-pass i to be varied. By this device the length of travel of the piston during the slowmotion phase of its movement can be varied to suit diflerent working conditions.
Further, the rotary regulating valve p in the by-pass i which controls the rate of movement of the piston during the fast-motion phase is made hollow, and within it is contained a cylindrical and angularly adjustable valve 7 which is independently adjustable by hand-lever 8 for controlling the rate of flow of liquid from the right hand end of the cylinder h through the passageway 9 to the reservoir i, during the slow-motion phase of movement of the piston g.
By the present invention the mechanism forming the subject of the above mentioned patent can be adapted in a simple and convenient manner to suit a wide variety of dilferent working conditions.
Having thus described my invention what I claim as new and desire to secure by Letters Patent is:
1. In a die casting or injection moulding machine of the kind specified, hydraulic control means comprising in combination a cylinder in the form of an angularly adjustable sleeve having therein a port at each end and a plurality of longitudinally and angularly spaced intermediate ports, means for imparting angular adjusting movements to the sleeve, a piston slidable in the cylinder and adapted to control any one of the intermediate ports depending on the angular position of the sleeve, an oil or other liquid reservoir in communication with the cylinder through one of the end ports, a by-pass arranged between the other end port and the intermediate port under the control of the piston, an adjustable valve in the by-pass, a non-return valve between the bypass and the intermediate port under the control of the piston, a second non-return valve between the by-pass and the reservoir, and an additional valve for controlling the rate of liquid flow through the by-pass.
2. A hydraulic control means as and for the purpose claimed in claim 1, in which the additional valve is adjustable and arranged to permit a variable liquid flow from the by-pass to the reservoir.
3. A hydraulic control means as and for the purpose 5 References Cited in the vfile of this patent UNITED STATES PATENTS
US489705A 1954-03-19 1955-02-21 Speed control of actuating element in die casting and injection moulding machines Expired - Lifetime US2792915A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2990821A (en) * 1958-10-23 1961-07-04 Holley Carburetor Co Secondary throttle dampening device
US3006204A (en) * 1958-07-11 1961-10-31 Hydro Chemie Ag Arresting device for parts moving up and down
US4043254A (en) * 1974-12-03 1977-08-23 Emhart Industries, Inc. Apparatus for cushioning the motion of a reciprocating member

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1484030A (en) * 1923-01-30 1924-02-19 Kitchen John George Aulsebrook Means for controlling motion in fluid-pressure apparatus
US2676572A (en) * 1949-08-10 1954-04-27 Perry Fay Company Fluid pressure tool slide control assembly
US2720946A (en) * 1952-04-07 1955-10-18 E M B Co Ltd Speed control of actuating element in die casting and injection moulding machines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1484030A (en) * 1923-01-30 1924-02-19 Kitchen John George Aulsebrook Means for controlling motion in fluid-pressure apparatus
US2676572A (en) * 1949-08-10 1954-04-27 Perry Fay Company Fluid pressure tool slide control assembly
US2720946A (en) * 1952-04-07 1955-10-18 E M B Co Ltd Speed control of actuating element in die casting and injection moulding machines

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3006204A (en) * 1958-07-11 1961-10-31 Hydro Chemie Ag Arresting device for parts moving up and down
US2990821A (en) * 1958-10-23 1961-07-04 Holley Carburetor Co Secondary throttle dampening device
US4043254A (en) * 1974-12-03 1977-08-23 Emhart Industries, Inc. Apparatus for cushioning the motion of a reciprocating member

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