WO1993001926A1 - Procede de moulage par injection-compression dans une machine de moulage par injection - Google Patents

Procede de moulage par injection-compression dans une machine de moulage par injection Download PDF

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Publication number
WO1993001926A1
WO1993001926A1 PCT/JP1992/000899 JP9200899W WO9301926A1 WO 1993001926 A1 WO1993001926 A1 WO 1993001926A1 JP 9200899 W JP9200899 W JP 9200899W WO 9301926 A1 WO9301926 A1 WO 9301926A1
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WO
WIPO (PCT)
Prior art keywords
cavity
injection
synthetic resin
volume
mold
Prior art date
Application number
PCT/JP1992/000899
Other languages
English (en)
Japanese (ja)
Inventor
Akira Yokota
Original Assignee
Komatsu Ltd.
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 Komatsu Ltd. filed Critical Komatsu Ltd.
Publication of WO1993001926A1 publication Critical patent/WO1993001926A1/fr

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Classifications

    • 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
    • B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
    • B29C45/561—Injection-compression moulding

Definitions

  • the present invention relates to an injection compression molding method for an injection molding machine in which a plasticized synthetic resin is injected and filled into a mold cavity from within a cylinder of an injection molding machine main body, and particularly has a high melt viscosity and a high fluidity.
  • the present invention relates to an injection compression molding method of an injection molding machine suitable for application to a plasticized synthetic resin having low heat resistance,
  • Injection molding enables molding with high dimensional accuracy, and among various injection molding materials, for example, ultra-high molecular weight polyethylene, fluororesin, etc. have excellent impact resistance, wear resistance, self-lubrication, chemical resistance, etc. Therefore, it is being widely used for various machine parts and household goods.
  • these plasticized synthetic resins such as ultrahigh molecular weight polyethylene and fluororesin have high melt viscosity and extremely low fluidity, and therefore are difficult to mold using ordinary molding methods.
  • an injection compression molding method has been employed to injection-mold such plasticized synthetic resin having a high melt viscosity and a low fluidity.
  • Various injection compression molding methods have been disclosed, but the following two injection compression molding methods are examples.
  • plasticized synthetic resin of melt-plasticized ultra-high-molecular-weight ethylene is injected and filled in a powder state into a cavity with a cavity volume 1.5 to 3.0 times the volume of the injected resin.
  • the cavity volume is less than or equal to 1.5 to 3.0 times the initial resin volume and less than or equal to 2.0 times the injection resin volume. Compress.
  • ultra-high molecular weight ethylene or fluorine that has been melt plasticized The plasticized plastic resin is injected and filled in the powder state into the cavity at the initial cavity volume of the target molded product volume.
  • the volume of the cavity was measured immediately before the end of injection filling and after the end of injection filling, by the time when there was a pressure difference between the inside of the cavity and part of the runner and the plasticized synthetic resin in the runner SU did not solidify. Is instantaneously expanded to 1.2 times or more of the initial cavity volume, and the plasticized synthetic resin of a part of the runner is introduced into the cavity in a powdered state. Subsequently, the volume of the cavity is compressed until it reaches the target volume.
  • the cavity is fixed to a cavity volume 1.5 to 3.0 times the injection resin volume
  • Powdered plasticized synthetic resin is injected and filled into the cavity fixed to the volume of the molded product. Therefore, in the case of the first method, since the pressure of the plasticized synthetic resin in the cavity does not increase and the powder state is maintained, the laminar separation in the single-piece molded mold is performed. A molded article of excellent quality and appearance can be obtained without any occurrence of cracks.
  • the pressure of the plasticized synthetic resin in the cavity does not increase, in a multi-cavity mold, the filling balance between the cavities for each molded product cannot be maintained, and there is no space between the molded products.
  • the weight or the shape varies.
  • the pressure or pressure of the plasticized synthetic resin in the cavity is reduced, so that the weight or shape of the molded product varies among molded products in a multi-cavity mold. The problem is solved.
  • the pressure of the plasticized synthetic resin in the cavity increases, the powder state is not maintained, and the pressure applied to the plasticized synthetic resin that has been fused and injected into the cavity is generally uniform. Then, the plasticized synthetic resin moves in the cavity based on the pressure difference, and solidifies in layers sequentially as it moves from the wall surface of the cavity. There is a problem that occurs.
  • the present invention has been developed in order to solve such a problem. It is an object of the present invention to provide an injection compression molding method for an injection molding machine in which a weight or a shape does not vary between molded products even in a multi-cavity mold, and a laminar separation does not occur.
  • An injection compression molding method for an injection molding machine basically comprises:
  • a plasticized synthetic resin is injected and filled into a mold cavity from a cylinder of the injection molding machine body and compressed.
  • a plasticizable synthetic resin is injected into the mold cavity from within the cylinder of the injection molding machine main body, and the injected plasticized synthetic resin reduces the target molded product volume of the mold.
  • a movable mold that constitutes the mold so that the pressure applied to the plasticized synthetic resin injected into the cavity until the cavity is filled with the excess cavity capacity is uniform.
  • the injection-filled plasticized synthetic resin has a cavity volume. Compression process for applying a pressing force to the movable mold to compress to the volume of the target molded product
  • a predetermined pressing force is applied to the movable mold to apply an urging force to shrink the volume of the cavity and press the plasticized synthetic resin, the pressure of the plasticized synthetic resin in the cavity increases, Also, the pressure applied to the plasticized synthetic resin injected into the cavity becomes uniform as a whole. Furthermore, the predetermined pressing force is applied to the cavity in the cavity where the injected plasticized synthetic resin exceeds the target molded product volume.
  • the injection molding machine body is inserted into the cavity in a cavity having a cavity volume smaller than a target molded product volume of the mold while applying a pressing force to the movable mold to prevent the expansion of the cavity volume.
  • the injection filling in the second step is performed by reducing the elastic recovery stress at least when the pressure applied to the plasticized synthetic resin injected and filled in the cavity in the cavity having a cavity volume smaller than the target molded product volume of the mold is small. Injection filling is performed up to the pressure that causes the plasticized synthetic resin to be in a so-called adiabatic compression state, and the temperature of the plasticized synthetic resin rises. Absent.
  • the movable mold has a cavity volume such that the pressure applied to the plasticized synthetic resin injected and filled into the mold cavity from within the cylinder of the injection molding machine main body becomes uniform.
  • the first embodiment it is preferable to set a restriction on the expansion amount for expanding the third step, and in the second embodiment, to the cavity volume exceeding the target molded product volume in the second step.
  • the present invention provides an injection molding machine in which a flow path opening / closing valve is interposed in a flow path of a plasticized synthetic resin between a cylinder of an injection molding machine main body and a mold cavity. Even in the case of a molding machine, by controlling the opening and closing of this flow path opening / closing valve, and even in the case of an injection molding machine in which such a flow path opening / closing valve is not interposed, the cylinder of the main body of the injection molding machine is appropriately formed. It goes without saying that the present invention can be applied by controlling the injection pressure of the plasticized synthetic resin into the mold cavity from inside.
  • ultra-high molecular weight polyethylene Fluorine resin or the like can be used as the plasticized synthetic resin.
  • This ultra-high molecular weight polyethylene is, for example, obtained by Ziegler polymerization, has a much larger molecular weight than ordinary polyethylene, and has a very high melt viscosity among the plasticized synthetic resins used for injection molding. It is known as a resin that is more difficult to mold than plasticized synthetic resins.
  • “HIZEXMI” has a limiting viscosity [] force of 16.7 dl / g and a melt index (ASTM D 1238 FMI 120) of less than 0.01 g / 10 min in a delican of 135 :.
  • Fluorinated resin refers to tetrafluoroplastic styrene resin, tetrafluoroplastic styrene, hexafluoropropylene copolymer resin, and methylene trifluoride chloride.
  • the temperature at the time of injection of these ultra-high molecular weight ethylene, fluorine resin, etc. is particularly limited as long as it is a temperature substantially higher than the melting point of the resin and lower than the decomposition temperature of the resin. There is no.
  • FIG. 1 to 11 are drawings for explaining a preferred embodiment of an injection compression molding method for an injection molding machine according to the present invention
  • FIG. 1 to FIG. 3 are a semi-illustrated longitudinal sectional view of the entire injection molding machine of the first embodiment, an enlarged longitudinal sectional view of a main part, and a sequence diagram of the first embodiment of the present invention.
  • FIGS. 4 and 5 are a semi-illustrated longitudinal sectional view of the entire injection molding machine of the second embodiment, a sequence diagram of a second embodiment of the present invention
  • FIGS. 6 to 8 are semi-illustrated longitudinal sectional views of the entire injection molding machine of the third embodiment, sequence diagrams of the first and second embodiments of the present invention, and FIGS. 9 to 11 show the fourth embodiment.
  • FIG. 3 is a half-sectional schematic longitudinal sectional view of the entire injection molding machine of the present invention, and each sequence diagram of the first and second embodiments of the present invention.
  • HIZEX MILLION 340 M an ultra-high molecular weight polyethylene, is used at a temperature substantially higher than the melting point of the resin and higher than the decomposition temperature of the resin.
  • the injection temperature is set and used within the range of 170 to 240, which is a low temperature.
  • FIG. 1 which shows the overall outline of the injection molding machine 1
  • the injection molding machine main body 11 is joined to a mold 10 for molding an injection molded product at a nozzle portion 12.
  • the pelletized or powdered material resin of the plasticized synthetic resin supplied from the material hopper 14 in the heated cylinder 13 is melted and mixed. While kneading, the melt-plasticized material resin is measured, and a flow path 15 formed in the nozzle portion 12, and further, as shown in FIG.
  • a screw 19 to be injected and filled into the cavity 18 of the mold 10 via the socket 17 is provided. The screw 19 is rotated by a screw rotation motor 20 for melting and kneading the material and resin.
  • the screw 19 and the screw rotation motor 20 are mounted on a base 21, and the base 21 controls a flow control valve 22 and an electromagnetic relief valve 23 by a control device 24.
  • a control device 24 controls the pressure oil is supplied to and discharged from the hydraulic bis tons device 27 via line 26 from the pressurized oil source 25 in have been, in other words c is driven to the left and right in FIG. 1, plasticized emitted Takashi ⁇
  • the synthetic resin is measured and the plasticized synthetic resin being measured is moved forward and backward toward the nozzle portion 12 of the screw 19 for filling the mold 18 into the cavity 18 of the mold 10, and the like.
  • the application of a predetermined pressing force to the screw 19 for setting the plasticized synthetic resin in the cylinder 13 to the predetermined injection pressure is performed via the base 21 by supplying and discharging the pressurized oil to and from the hydraulic piston device 27. Done.
  • the controller 24 includes a stroke set value set in the stroke setter 28 and a screw position actually measured by the screw position detector 29 engaged with the base 21. The result of comparison with the value is Given. Based on the comparison result, the control device 24 controls the flow rate control valve 22 and the pressure relief setting control for the electromagnetic relief valve 23 in accordance with a predetermined program. Control such as forward and backward movement toward the nozzle section 12 and application of a predetermined pressing force is performed. The control of the rotation or stop of the screw rotation motor 20 is also performed by the control device 24 in connection with the advance and retreat of the screw 19 and the like.
  • the mold 10 is composed of a fixed mold 31 joined to the nozzle 12 of the injection molding machine body 11, an intermediate mold 32 forming the cavity 18, and a movable mold 31.
  • the cavity volume is contracted and expanded by the reciprocation of the movable mold 33.
  • the movable mold 33 is engaged with a piston rod 35 of a compression cylinder 34, and the piston rod 35 is similarly controlled by an control device 24 for an excitation switching control for an electromagnetic switching valve 36 and for an electromagnetic relief valve 37.
  • a return pin 40 is provided on the front side of the movable mold 33.
  • the return pin 40 contacts the intermediate mold 32 when the movable mold 33 advances, the movable mold 33 advances.
  • the minimum cavity volume of cabin 18 is secured.
  • a stop 41 is provided behind the movable mold 33, and the movable mold 33 comes into contact with the stop 41 when the movable mold 33 retreats. By controlling the retreat, the expansion of the capacity of the cavity 18 is regulated.
  • the intermediate mold 32, the movable mold 33, and the stopper 41 are integrally brought close to the fixed mold 31 by known means, and the mold is closed.
  • the solenoid a of the electromagnetic switching valve 36 is excited, and the set pressure value of the electromagnetic relief valve 37 is set and controlled to the highest value in the settable range, and the pressure oil source is set. From 38, the highest pressure oil is supplied to the piston side 34a of the compression cylinder 34.
  • the supplied pressure oil causes the pressure value of the hydraulic pressure in the piston side 34a of the compression cylinder 34 to reach the maximum value, and the screw rod 35 is driven rightward in FIG.
  • the movable die 33 is moved forward by the application of this pressing force until the return pin 40 comes into contact with the intermediate die 32. In this way, The cavity volume at the cavity 18 is contracted to the initial cavity volume which is the minimum cavity volume, in other words, a cavity volume smaller than the target molded product volume is secured.
  • the set pressure value of the electromagnetic relief valve 23 is set and controlled to an arbitrary pressure value A kgZ crf, and the hydraulic pressure Supply pressurized oil to the ton device 27.
  • the pressing force to be driven to the left in FIG. 1 is applied to the screw 19, and the screw 19 is advanced by a predetermined stroke set value set in the stroke setting device 28. .
  • the advance by the predetermined stroke set value is performed by controlling the flow rate of the pressure oil by the flow control valve 22. In this way, as the screw 19 advances, a predetermined amount of melt-plasticized plasticized synthetic resin corresponding to the target molded product in the cylinder 13 is pressurized into the cavity 18 having the initial cavity volume.
  • the set pressure value of the electromagnetic relief valve 23 is changed from the arbitrary pressure value A kg Z cni to the injection pressure at which the plasticized synthetic resin is not further injected into the cavity 18.
  • the volume of the cavity is shrunk so as to reduce the pressure to a predetermined pressing force for applying an urging force to pressurize the plasticized synthetic resin. Therefore, due to the elastic recovery stress of the injection-filled plasticized synthetic resin that resists the predetermined pressing force, the movable mold 33 is retracted to the left in FIG. The capacity of 18 cavities is expanded. The amount of expansion of the cavity volume is regulated by the movable mold 33 being brought into contact with the flange 41 by retreating.
  • the plasticized synthetic resin in the cavity 18 does not solidify, but after the plasticized synthetic resin in the gate section 17 has solidified, the electromagnetic relief valve of the solenoid-operated switching valve 36 while still maintaining the excitation of the solenoid a.
  • the set pressure value of 37 is set and controlled to the highest value in the settable range, and pressure oil is supplied from the pressure oil source 38 to the piston side 34a of the compression cylinder 34. Due to the supply of the supplied pressure oil, the pressure value of the hydraulic pressure in the piston side 34a of the compression cylinder 34 rises, and the piston rod 35 is driven rightward in FIG.
  • the movable mold 33 is advanced so as to compress the plasticized synthetic resin until the cavity volume of the cavity 18 reaches the target molded product volume by the application of the pressing force. .
  • the set pressure value of the solenoid relief valve 23 is set and controlled to the lowest value in the settable range.
  • the solenoid a of the solenoid-operated directional control valve 36 is de-energized and the piston side 35a and the piston rod 35 side of the compression cylinder 34 are connected to the tank. Therefore, after the hydraulic pressure in the piston side 34a of the compression cylinder 34 is reduced, the intermediate mold 32, the movable mold 33, and the stock are fixed to the fixed mold 31 by known means. Go away from par 41 and open mold 10.
  • the solenoid a of the electromagnetic switching valve 36 is excited to supply pressure oil from the pressure oil source 38 to the piston side 34a of the compression cylinder 34, and the piston rod 35 is moved to the position shown in FIG.
  • the excitation of the solenoid a of the electromagnetic switching valve 33 is cut off to excite the solenoid Kb, and the set pressure value of the electromagnetic relief valve 37 is set and controlled to the lowest value in the settable range, thereby controlling the pressure oil source.
  • Pressure oil is supplied from 38 to the piston rod 35 side of the compression cylinder 34, and the biston rod 35 is driven to the left in FIG. 1 to retreat the movable mold 33 to prepare for the next molding cycle.
  • the hydraulic oil source for the hydraulic piston device 27 and the compression cylinder 34 is shared, and the electromagnetic relief valve 37 and the hydraulic oil source 38 in the first embodiment are omitted, and the electromagnetic relief valve 23 and The hydraulic oil source 25 is shared by the hydraulic piston device 27 and the compression cylinder 34.
  • the pressure applied to the plasticized synthetic resin injected and filled into the cavity 18 is made uniform in the pipe line 39 a on the piston side 34 a between the compression cylinder 34 and the electromagnetic switching valve 36.
  • Shrink the cavity volume to As a counterbalance valve for applying a constant pressing force to the movable mold 33 to apply a biasing force to pressurize the growth fat, a relief valve 50 with a fixed set pressure value and a check valve 51 are provided in a parallel arrangement.
  • the piston rod 35 is connected to the pressure oil source 25 by controlling the pressure value setting control for the electromagnetic relief valve 23 by the control device 24 and the excitation switching control for the electromagnetic switching valve 36.
  • the intermediate mold 32, the movable mold 33, and the stopper 41 are integrally brought close to the fixed mold 31 by a known means, and the mold is closed.
  • the solenoid a of the solenoid-operated directional control valve 36 is excited to supply pressure oil from the pressure oil source 25 to the piston side 34a of the compression cylinder 34.
  • the supplied pressure oil is sealed in the piston side 34a of the compression cylinder 34 by the action of the check valve 51, and the pressure value of the hydraulic pressure in the piston side 34a of the compression cylinder 34 is
  • the piston port 35 is driven rightward in FIG. 4 to apply a constant rightward pressing force to the movable mold 33.
  • the fixed pressing force moves the movable mold 33 forward until a return pin (not shown) comes into contact with the intermediate mold 32.
  • the constant pressing force applied to the movable mold 33 reduces the volume of the cavity so that the pressure applied to the plasticized synthetic resin injected and filled into the cavity 18 becomes uniform throughout.
  • the solenoid valves a and b of the electromagnetic switching valve 39 are de-energized by the action of the relief valve 50 and the check valve 51. Is also retained.
  • the set pressure value of the solenoid relief valve 23 is increased and set to a predetermined pressure value, and the hydraulic pressure source 25 is used to control the hydraulic piston device.
  • the plasticized synthetic resin in the cavity 18 does not solidify, but after the plasticized synthetic resin in the gate section 17 has solidified, the solenoid a of the electromagnetic switching valve 36 is excited and the set pressure value of the electromagnetic relief valve 23 is set.
  • the supplied pressure oil causes the pressure value of the hydraulic pressure in the piston side 34a of the compression cylinder 34 to increase, and the piston rod 35 is driven rightward in FIG. A pressure is applied, and the movable mold 33 is advanced so as to compress the plasticized synthetic resin until the cavity volume of the cavity 18 reaches the target molded product volume by the application of the pressing force.
  • the solenoid a of the electromagnetic switching valve 36 is excited to supply pressure oil from the pressure oil source 25 to the piston side 34a of the compression cylinder 34, and the piston rod 35 is opened.
  • the molded product held in the intermediate mold 32 is protruded from behind and is released from the mold 10 by moving the movable mold 33 forward by driving it to the right.
  • the solenoid a is turned off in the solenoid-operated directional control valve 33 to excite the solenoid Kb, and the pressure oil source 25 supplies the pressure oil from the pressure oil source 25 to the piston rod 35 side of the compression cylinder 34.
  • the screw opening 35 is driven to the left in Fig. 4 to move the movable mold 33 backward, preparing for the next molding cycle.
  • the hydraulic oil source for the hydraulic piston device 27 and the compression cylinder 34 is shared, and the electromagnetic relief valve 37 and the hydraulic oil source 38 in the first embodiment are omitted and the electromagnetic oil supply is omitted.
  • Leaf valve 23 and pressure oil source 25 is shared with the hydraulic biston device 27 and the compression cylinder 34.
  • an electromagnetic relief valve 50 ′ and a check valve 51 are provided in parallel in a pipe line 39 a on the piston side 34 a between the compression cylinder 34 and the electromagnetic switching valve 36.
  • the piston rod 35 includes an electromagnetic relief valve 50 ′ in addition to the control operation of the pressure value setting control for the electromagnetic relief valve 23 by the control device 24 and the excitation switching control for the electromagnetic switching valve 36.
  • the solenoid a of the electromagnetic switching valve 36 is excited, and the set pressure value of the electromagnetic relief valve 50 'is set and controlled to the highest value in the settable range, so that the hydraulic oil source 25 is controlled. Supplies the highest pressure oil to the piston side 34a of the compression cylinder 34.
  • the supplied pressure oil is sealed in the piston side 34a of the compression cylinder 34 by the action of the check valve 51, and the pressure value of the hydraulic pressure in the piston side 34a of the compression cylinder 34 is At the maximum value, the movable mold 33 is advanced until a return pin (not shown) comes into contact with the intermediate mold .32. Others are the same as in the first embodiment.
  • the solenoid a of the electromagnetic switching valve 36 is de-energized, but the set pressure value of the solenoid relief valve 50 'is set to the maximum value.
  • the pressure value of the pressurized oil enclosed in the piston side 34a of the compression cylinder 34 is maintained at the maximum value, and the cavity 18 continues to maintain the initial cavity volume. I have. This initial cavity volume is retained and the cavity is maintained.
  • the screw 19 is advanced by the predetermined stroke within the cavity 18 where the expansion of the tee 18 is prevented, and a predetermined amount of melt-plasticized plasticized synthetic resin corresponding to the target molded product Is charged at high pressure and at high speed. Others are the same as in the first embodiment.
  • the set pressure value of the electromagnetic relief valve 23 is further reduced to an injection pressure at which the plasticized synthetic resin is not injected and charged into the cavity 18, and the electromagnetic relief valve is further discharged.
  • the set pressure value of the valve 50 ' is set and controlled from the highest value to an arbitrary 7-lower pressure value E kg / ciii.Injection into the cavity 18 based on this set pressure value E kg Z cni
  • a biasing force is applied to the filled plasticized synthetic resin such that the volume of the cavity is shrunk so that the pressure applied to the plasticized synthetic resin becomes uniform throughout and the plasticized synthetic resin is pressed.
  • the other points are the same as in the first embodiment, including that the cavity volume is expanded by the elastic recovery stress of the plasticized synthetic resin.
  • the plasticized synthetic resin in the cavity 18 does not solidify, but after the plasticized synthetic resin in the gate portion 17 has solidified, the set pressure value of the electromagnetic relief valve 23 is adjusted to an arbitrary pressure according to the molding conditions.
  • the solenoid a of the solenoid-operated directional control valve 36 is excited, and the set pressure value of the solenoid relief valve 50 ′ is set and controlled to the maximum value in the settable range. In this way, the hydraulic pressure in the piston side 34a of the compression cylinder 34 is increased, and the movable mold 33 is moved to the plasticized plastic until the cavity volume of the cavity 18 reaches the target molded product volume. Compress.
  • the set pressure value of the solenoid relief valve 50 ' is set and controlled to the maximum value within the settable range, and the solenoid a of the solenoid-operated switching valve 36 is excited to supply pressure oil. From 25, pressurized oil is supplied to the piston side 34a of the compression cylinder 34, and the movable die 33 is advanced to project the molded product held in the intermediate die 32 from behind and release it from the die 10. Let it.
  • the solenoid a is turned off for the solenoid-operated switching valve 33 to excite the solenoid b, and the set pressure value of the solenoid relief valve 50 ′ is set and controlled to the lowest value in the settable range, and the movable metal The mold 33 is retracted to prepare for the next molding cycle.
  • the solenoid a of the solenoid-operated switching valve 36 is excited, and the set pressure value of the solenoid relief valve 50 'is set and controlled to an arbitrary pressure value G kg Zc, and the hydraulic oil is controlled.
  • Pressure oil is supplied from the source 25 to the piston side 34a of the compression cylinder 34, and a constant rightward pressing force is applied to the movable mold 33 in Fig. 6 determined by the pressure value G kg Z crf.
  • Others are the same as the second embodiment.
  • the plasticized synthetic resin in the cavity 18 does not solidify, but after the plasticized plastic in the gate section 17 has solidified, the solenoid s of the electromagnetic switching valve 36 is excited and the electromagnetic relief valve 50 'is set.
  • the pressure value is set and controlled to the maximum value within the settable range, and pressure oil is supplied from the pressure oil source 25 to the piston side 34a of the compression cylinder 34.
  • the hydraulic oil source for the hydraulic piston device 27 and the compression cylinder 34 is shared, and the electromagnetic relief valve 37 and the hydraulic oil source 38 in the first embodiment are omitted.
  • the relief valve 23 and the pressure oil source 25 are shared by the hydraulic screw device 27 and the compression cylinder 34.
  • an electromagnetic relief valve 50 "and a pilot check valve 52 are sequentially provided from the compression cylinder 34 side to a pipe line 39a on the piston side 34a between the compression cylinder 34 and the electromagnetic switching valve 36.
  • the pilot check valve 52 receives a pilot pressure from a pipe 39 b on the piston rod 35 side between the compression cylinder 34 and the electromagnetic switching valve 36.
  • the piston rod 35 controls the pressure value setting control for the electromagnetic relief valve 23 by the control device 24 and the control operation of the excitation switching control for the electromagnetic switching valve 36,
  • the pressure value setting control for the electromagnetic relief valve 50 " By controlling the pressure value setting control for the electromagnetic relief valve 50 ", the pressure oil supplied and discharged from the pressure oil source 25 to the compression cylinder 34 via the lines 39, 39a, and 39b is also controlled. As a result, it is driven left and right in FIG.
  • the set pressure value of the solenoid relief valve 50 " is set and controlled to the maximum value within the settable range, and the solenoid a of the solenoid-operated switching valve 36 is excited to move the movable metal.
  • the mold 33 is moved forward and the molded product held in the intermediate mold 32 is protruded from behind and released from the mold 10.
  • the set pressure value of the electromagnetic relief valve 50 " is set to the maximum value.
  • injection molding in which a flow path opening / closing valve that opens and closes the flow path 15 in the flow path 15 of the nozzle portion 12 of the injection molding machine main body 11 is not provided.
  • the present invention is not at all hindered by using an injection molding machine in which a flow passage opening / closing valve is interposed. After that, by closing the flow path on-off valve, the molding cycle can be shortened and the control operation can be simplified.
  • the return pin is used to minimize the inside of the cavity 18 by the return pin.
  • the initial capacity which is the capacity of the capacity, is secured, it is not particularly necessary to secure the initial capacity.
  • the state of the plasticized synthetic resin injected into the cavity 18 has not been clarified.However, the present invention is applicable to any state including the powder state. Needless to say.
  • the present invention even if a plasticized synthetic resin having a high melt viscosity and low fluidity is used for a multi-cavity mold of a molded product, there is no variation in weight or shape between the molded products, and laminar separation occurs. Does not occur. Accordingly, similarly, the present invention can be applied not only to a mold having a single molded product but also to a plasticized synthetic resin having high fluidity to obtain a molded product having excellent quality and appearance.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

On applique à un moule mobile une pression prédéterminée destinée à exercer une force productrice d'énergie telle que la cavité d'un corps creux est comprimée afin de mettre sous pression une résine synthétique plastifiante. La pression appliquée à cette résine de synthèse plastifiante ainsi injectée à l'intérieur du corps creux devient uniforme jusqu'à ce que la résine synthétique plastifiante injectée ait rempli le corps creux, le volume de ce dernier étant supérieur au volume de l'objet destiné à être moulé. La résine synthétique plastifiante ainsi injectée est ensuite comprimée jusqu'à ce que le volume du corps creux atteigne le volume de l'objet destiné à être moulé.
PCT/JP1992/000899 1991-07-15 1992-07-15 Procede de moulage par injection-compression dans une machine de moulage par injection WO1993001926A1 (fr)

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JP20130891 1991-07-15
JP3/201308 1991-07-15

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Cited By (1)

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EP1125712A1 (fr) * 2000-02-09 2001-08-22 Sony Disc Technology Inc. Commande de pression pour une machine de moulage par injection

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NL1021421C2 (nl) * 2002-09-10 2004-03-11 Fountain Patents B V Inrichting en werkwijze voor het vervaardigen van producten uit een warm plastische massa.

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EP1125712A1 (fr) * 2000-02-09 2001-08-22 Sony Disc Technology Inc. Commande de pression pour une machine de moulage par injection
US6841103B2 (en) 2000-02-09 2005-01-11 Sony Disc Technology Inc. Injection molding apparatus and method

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