WO2002000415A1 - Moule metallique destine a une machine a injecter et procede de moulage par injection utilisant ce moule metallique - Google Patents

Moule metallique destine a une machine a injecter et procede de moulage par injection utilisant ce moule metallique Download PDF

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Publication number
WO2002000415A1
WO2002000415A1 PCT/JP2000/004221 JP0004221W WO0200415A1 WO 2002000415 A1 WO2002000415 A1 WO 2002000415A1 JP 0004221 W JP0004221 W JP 0004221W WO 0200415 A1 WO0200415 A1 WO 0200415A1
Authority
WO
WIPO (PCT)
Prior art keywords
mold plate
mold
injection molding
cavity
plate
Prior art date
Application number
PCT/JP2000/004221
Other languages
English (en)
Japanese (ja)
Inventor
Itsuo Shibata
Ryoichi Sekiguchi
Masashi Kobayashi
Original Assignee
Ju-Oh Inc.
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 Ju-Oh Inc. filed Critical Ju-Oh Inc.
Priority to PCT/JP2000/004221 priority Critical patent/WO2002000415A1/fr
Publication of WO2002000415A1 publication Critical patent/WO2002000415A1/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
    • B29C45/26—Moulds
    • B29C45/263—Moulds with mould wall parts provided with fine grooves or impressions, e.g. for record discs
    • B29C45/2642—Heating or cooling means therefor
    • 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
    • B22D17/2218—Cooling or heating equipment for dies

Definitions

  • the present invention relates to a mold and an injection molding method for an injection molding machine (including die casting) for obtaining a molded product having a predetermined shape by injecting a molten material into a cavity with a mold closed. Also, the present invention relates to a mold and an injection molding method for an injection molding machine in which a material is injected while a core surface is preheated to improve the fluidity of the material inside the cavity and the transferability to the mold.
  • a molten material is injected into a cavity with a fixed mold and a movable mold closed, and heat of the material is transferred to the cavity through the fixed mold and the movable mold. Heat is exchanged by discharging the material to the outside, and the material is solidified to obtain a molded product in the shape of the cavity.
  • the temperature of the mold is set considerably lower than the molten material injected to increase the heat exchange efficiency.
  • the injected molten material immediately begins to solidify and flows on the cavity surface while being sent by the injection pressure, resulting in poor transferability and warpage due to uneven residual stress.
  • it may cause the need for large injection pressures, or cause unfilled products that are not perfectly shaped.
  • Japanese Patent Application Laid-Open No. 8-39571 discloses an invention aimed at improving the transferability of a material (resin) ejected into a cavity by preheating a mold surface by induction heating. Is disclosed.
  • an induction heating coil is disposed in front of a movable mold with a pot, and the surface of the mold is preheated by induction heating of the induction heating coil. At the time of opening and closing, the induction heating coil and the mold are The heating coil is kept away from the mold. Another idea is to incorporate an induction coil inside the mold.
  • This method is an effective means for improving the transferability of the molded product surface and preventing warpage.
  • the mold since the mold is generally formed to be sufficiently large for the cavity in order to obtain sufficient rigidity during injection molding, it is necessary to set the surface of the mold to the desired temperature. It takes a long time. In addition, there is a problem that it takes a long time for cooling as a result of inputting extra heat energy, thereby prolonging the molding cycle time.
  • the thermal conductivity and melting point are considerably higher than those of resins, so that the injected molten metal touches the mold immediately. However, there is a problem that the above-mentioned inconveniences appear remarkably.
  • the present invention has been made in view of the above problems, and when performing the injection process, the temperature of the cavity surface or the core surface is heated to a certain value or more and uniformly, and the good fluidity of the injected material is obtained.
  • Injection molding machine that retains heat and obtains molded products with excellent transferability, promotes rapid heat dissipation of molten resin and molten metal injected into the cavity, and does not extend the cycle time of injection molding It is an object of the present invention to provide a metal mold and an injection molding method. Disclosure of the invention
  • the input heat is stored inside the mold, which increases the cycle time of injection molding and improves heat dissipation.
  • the following method was devised.
  • the portion where the cavity surface or the core forming the cavity is formed is made independent of the mold plate, and the portion is made into a thin plate shape so that the heat capacity thereof is made as small as possible. Preheating can be quickly performed to a surface temperature that can maintain fluidity.
  • the temperature distribution of the independent portions can be made substantially uniform, and the predetermined portion necessary for good transfer can be obtained. It has been found that the temperature can be maintained.
  • FIG. 1 is a perspective view for explaining the inventive concept of the present invention more specifically.
  • the mold of the present invention is formed with a first mold plate and a second mold plate that can be opened and closed, and between the first mold plate and the second mold plate.
  • a third mold plate (3) is interposed between a first mold plate (2) and a second mold plate (4).
  • a cavity surface (5A) or a core surface (5B) is formed on the third mold plate, and the third mold plate is supported in an insulated state by supporting means (6) in a mold-open state.
  • the present invention may be applied to a mold formed by reversing the cavity surface and the core surface.
  • the third mold plate By preheating the third mold plate supported in an insulated state by heating means, The third mold plate can be preheated to a uniform temperature distribution over almost the entirety. It is advisable to select an optimal preheating temperature according to the characteristics of the material.
  • the third mold plate which has been preheated to a predetermined temperature, is moved relative to the first mold plate to close the mold, and the material melted from the molding machine is placed in the capty. Almost simultaneously, the second mold plate is pressed against the third mold plate.
  • the third mold plate should have as small a heat capacity as possible in order to quickly heat it by the heating means and to improve the heat radiation when the second mold plate is pressed. For example, it is preferable to make the thickness of the portion where the cavity surface or the core surface is formed as thin as possible, but the molten surface flows until the molten material flows through the cavity surface or the core surface and the filling is completed. It is necessary to select a wall thickness so that heat remains in the wall.
  • the rigidity of the third mold plate is reduced, and if the injection is started, the third mold plate is deformed by the injection pressure. Therefore, in the present invention, the second mold plate is pressed against the third mold plate at the time of the injection step to secure the rigidity of the third mold plate.
  • the second mold plate By making the heat capacity of the second mold plate significantly greater than that of the third mold plate, the second mold plate not only ensures the rigidity of the third mold plate, but also It also plays a role as a heat radiating means to quickly radiate the heat of the template.
  • the opening / closing operation of the mold is not limited to the case where the third mold plate is moved with respect to the first mold plate to open and close, and the first mold plate is moved with respect to the third mold plate. This includes the case where the template is moved to open and close. ⁇ Since the third mold plate is pre-heated to a predetermined temperature, the material injected from the molding machine is filled to every corner of the cavity with good fluidity, and is molded at low pressure and excellent in transferability. Goods can be obtained.
  • the third mold plate is formed to have an extremely smaller heat capacity than the first mold plate and the second mold plate.
  • the heat of the third mold plate is quickly radiated to the first mold plate and the second mold plate, and the material in the cavity is quickly solidified. It can be quickly heated to the desired temperature in preparation for the next injection.
  • a temperature detecting means such as a temperature sensor is provided on a third mold plate for performing preheating, and control is performed so that the third mold plate has a predetermined temperature. Do Is good.
  • the support means is a guide pin of a mold, and the guide pin supports the third mold plate and is movable with respect to the first or second mold plate.
  • the third mold plate can be surrounded by the guide bin. It is supported thermally independent of the structure. Therefore, if a part of the third mold plate is preheated by the heating means, the heat spreads over the entire mold plate, and the entire third mold plate is preheated to a substantially uniform temperature. can do.
  • the third mold plate includes a thin portion having a small heat capacity including a cavity surface or a core surface, and a thick portion having a large heat capacity formed around the thin portion.
  • the mold plate may be configured to abut at least the thin portion during injection.
  • the first or second mold plate against the thin portion of the third mold plate, it is possible to quickly release the heat of the material injected into the gap. Considering the balance between the amount of heat supplied from the thick part to the thin part and the amount of heat transferred from the thin part to the first or second mold plate, the volume of the thick part and the thin part is taken into account.
  • Heat capacity is preferably determined.
  • a heat insulating member may be provided on at least a part of the periphery of the thick part.
  • the heating means may be provided outside the third mold plate separately from the third mold plate, or may be provided integrally with the third mold plate.
  • the heating means when a heating means is provided integrally with the third mold plate and heat is transmitted by heat conduction, the heating means may be configured to always preheat the third mold plate.
  • the timing of closing the mold may be such that when the injection step is started, the mold is moved from a state having a minute gap between the third mold plate and the second mold plate.
  • the third mold plate is brought into contact with the first mold plate, and simultaneously with the start of the injection, the second mold plate is moved to the second mold plate. It is preferable that the third mold plate is brought into contact with the third mold plate and the third mold plate is pressed with a force against the injection pressure.
  • the cavity surface or the core surface can be maintained at the optimum temperature for improving the transferability until the injected material is filled in the cavity, and almost simultaneously with the completion of the injection.
  • the material can be solidified in a short time.
  • mold clamping is performed in two stages, and the transferability of the material can be improved.
  • one or more air vent holes communicating with the cavity are formed in the second mold plate from the side where the second mold plate abuts, and the material is injected into the cavity. In such a case, the air may be discharged into the atmosphere through the minute gap.
  • the air in the cavity can be released more smoothly, the flow of the material in the cavity can be improved, and the transferability can be further improved.
  • a stamper for forming pits on the optical disk may be arranged on the first mold plate side. ⁇ By doing so, the effect of preheating on the stamper is minimized be able to.
  • the material to be injected into the cavity may be a metal such as a magnesium alloy, an aluminum alloy, or a zinc alloy.
  • the support means is a guide pin
  • the guide pin is formed, for example, as two pieces at the center of the mold, and a hole in the second mold plate passing therethrough is formed in the second mold plate. May be formed in a long hole extending in the horizontal direction from the center.
  • the mold plate is a first mold plate and a second mold plate that are openable and closable, and the mold plate is the first mold plate.
  • a third mold plate provided between the mold plate and the second mold plate, wherein a cavity surface or a core surface of the cavity is formed on the third mold plate;
  • the third mold plate is supported in a thermally insulated state, is movable in a pressing direction and a mold closing direction, and in the mold opened state, the third mold plate is heated by a heating means, and the preheated third mold plate is heated.
  • the mold plate is closed by moving the mold plate relatively toward the first mold plate, and is brought into contact with the third mold plate from the back of the second mold plate to perform injection molding. And cooling. Even with this method, it is possible to obtain a molded product that has sufficient transferability to all corners of the cavity while maintaining the viscosity of the material at a certain level or more.
  • FIG. 1 is a perspective view for explaining the inventive concept of the present invention.
  • FIG. 2 is a sectional view of a mold according to the first embodiment of the present invention.
  • FIG. 3 is an enlarged cross-sectional view of a thick portion of an intermediate mold plate supported by guide pins.
  • FIG. 4 is a longitudinal sectional view of a mold for explaining the operation of the first embodiment of the present invention, wherein (a) shows a state in which an intermediate mold plate abuts on a fixed mold, and (b) shows a movable state. This shows a state in which the mold plate comes into contact with the intermediate mold plate and the material is injected from the sprue runner.
  • FIG. 5 is a longitudinal sectional view of a mold according to a second embodiment of the present invention.
  • the fixed mold, the intermediate mold, and the movable mold plate at the timing when the molten material is injected from the sprue runner. It is a figure explaining the positional relationship of.
  • FIG. 6 (a) is a sectional view of a mold for explaining a third embodiment of the present invention
  • FIG. 6 (b) is a plan view of a mold of a fourth embodiment of the present invention.
  • FIG. 7 is a cross-sectional view of a mold according to a fifth embodiment of the present invention, wherein (a) shows a mold open state, and (b) shows a state when an intermediate mold plate abuts on a fixed mold plate. Is shown. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 2 is an explanatory view of a configuration of a mold according to the first embodiment of the present invention, a longitudinal sectional view thereof, and FIG. 3 is a view of a thick portion of an intermediate mold plate supported by guide pins.
  • FIG. 4 is an enlarged cross-sectional view, and FIG. 4 is a view for explaining the operation of the mold shown in FIG. 2; (a) shows the state when the intermediate mold plate is in contact with the fixed mold;
  • FIG. 2 is a longitudinal sectional view showing a state in which the mold is closed.
  • the mold 10 of this embodiment is used for manufacturing optical disks such as CDs and DVDs.
  • the mold 10 includes a fixed mold plate 20 as a first mold plate fixed to a main body of an injection molding machine (not shown) via a mounting plate 21.
  • Fixed mold plate 2 A movable mold plate 40 which is a second mold plate provided to be able to move forward and backward with respect to 0; and a fixed mold provided between the fixed mold plate 20 and the movable mold plate 40.
  • a plate 20 and an intermediate mold plate 30 which is a third mold plate movable with respect to the moving mold plate 40 are provided.
  • the cavity surface 51 5 is formed on the fixed mold 20 side
  • the core surface 51B is formed on the intermediate mold plate 30.
  • a stamper (not shown) for forming a pit of ⁇ 0 ⁇ 13 ⁇ 0 is placed on the fixed mold plate 20 side where preheating is not performed.
  • the reason why the stamper is provided on the mold side where preheating is not performed is to protect the stamper, which requires extremely high-precision pit positioning, from the influence of thermal distortion due to preheating.
  • the heating means for preheating the movable mold plate 40 is provided at the standby position A of the movable mold plate 40 in the mold open state.
  • the heating means an electric heating heater, a wrench, an induction heating coil or the like can be used.
  • an induction heating coil 70 for heating the intermediate mold plate 30 from the outer periphery is provided at a standby position A of the intermediate mold plate 30 when the mold is opened. I have.
  • the stationary mold plate 20 is provided with a sprue runner 24 for injecting a molten material such as polycarbonate injected from a cylinder of the injection molding machine into the cavity 51 (see FIG. 4).
  • the intermediate mold plate 30 has a thin portion 32 having a small heat capacity and a thick portion 31 having a large heat capacity formed on the outer periphery of the thin portion 32. ing.
  • the core surface 5 1 B is included in the thin portion 32.
  • the intermediate mold plate 30 When the intermediate mold plate 30 is preheated by the induction heating coil 70, heat is quickly transmitted from the outer periphery of the intermediate mold plate 30 to the entire intermediate mold plate 30 and the injection molding is performed. It is preferable to use a metal having excellent thermal conductivity, for example, beryllium, so that the heat of the material injected into the cavity 51 may be quickly dissipated.
  • a metal having excellent thermal conductivity for example, beryllium
  • the thin portion 32 of the intermediate mold plate 30 contacts the fixed mold plate 20. At this time, the heat of the pre-heated intermediate mold plate 30 is reduced by the thin portion. 3
  • the contact area between the thin portion 32 and the fixed mold plate 20 Is preferably as small as possible.
  • the movable mold plate 20 is set to the intermediate mold plate Needless to say, when 30 is pressed, a contact area that does not cause plastic deformation of the intermediate mold plate 30 must be ensured.
  • a temperature sensor 34 for burying a temperature of the preheating of the intermediate mold plate 30 by the induction heating coil 70 is buried near the portion where the core surface 51B of the thin portion 32 is formed. ing.
  • a control device (not shown) of the mold 1 guides the intermediate mold plate 30 to a predetermined temperature based on the detection result of the temperature sensor 34.
  • the control of the voltage applied to the heating coil 70 is performed.
  • the thick part 31 of the intermediate mold plate 30 acts as a heat storage part at the time of opening and closing.
  • the heat stored in the thick portion 31 is quickly transferred to the thin portion 32, so that the core surface 51 of the intermediate mold plate 30 is formed. B
  • the temperature can be raised quickly. Therefore, the temperature of the core surface 51 B, which must be increased by preheating the induction heating coil 70 for the next injection molding, can be small, and the heating time for preheating can be shortened.
  • the thick portion 31 may be provided with one or more heat storage members 35 made of metals having different specific heats in order to enhance heat storage.
  • the width of the thick portion 31 is such that when the mold is closed, there is a slight gap between the fixed mold plate 20 and the movable mold plate 40. It is formed to be able to. —This is to prevent heat from moving from the thick part 31 as the heat storage part to the fixed mold plate 20 and the movable mold plate 40.
  • a heat insulating member 33 made of ceramic or the like having excellent heat insulating properties is provided on both surfaces of the thick portion 31.
  • the volume (heat capacity) of the thin portion 32 is set so that the temperature of the core surface 51 B is at a temperature at which the transferability of the material is optimized by the heat transferred from the thick portion 31. It is preferable to be able to quickly release the heat of the material in the cavity 51 when the movable mold plate 40 comes into contact. Further, it is preferable that the thin portion 32 be thin for quick heat exchange as described above. Therefore, the rigidity is secured by bringing the movable mold plate 40 into contact so that the thin portion 32 is not deformed by the external force acting during opening / closing of the mold, preheating and during the injection process.
  • each of the thick portion 31 and the thin portion 32 forming the intermediate mold plate 30 depends on the melting point of the material to be injection-molded, the cycle time of the injection molding, It is preferable to determine the optimum one by experiments, calculations, etc., taking into account the form of the heating means. If the volume of the thick portion 31 is too large, it takes a long time for preheating. Conversely, if the heat capacity of the thick portion 31 is too small, the thick portion 31 does not sufficiently act as a heat storage portion, and it takes a long time to heat the next injection molding.
  • a plurality of (four in this embodiment) guide pins 60 are erected on the movable mold mounting plate 41 in order to support the intermediate mold plate 30 in an insulated state.
  • the intermediate mold plate 30 is supported by the guide pins 60.
  • through-holes 3 la are formed in the thick portion 31 of the intermediate mold plate 30 at a plurality of locations (four locations in this embodiment) in accordance with the positions of the guide pins 60. ing.
  • a spring 63 is provided between the movable mold plate 40 and the intermediate mold plate 30 as an urging means, and the intermediate mold plate 30 is always attached to the fixed mold plate 20 side. I'm going.
  • the movable mold plate 40 is formed with a receiving hole 46 for a guide pin 60 and a spring 63.
  • a sleeve 47 made of a material having excellent heat insulation such as ceramic is fitted into the through hole 3 la, and the sleeve 47 is inserted between the guide pin 60 and the intermediate mold plate 30.
  • the guide pins 6 • 0 may be formed of a material such as ceramic.
  • the movable mold plate 40 as the second mold plate is brought into contact with the intermediate mold plate 30 at the time of the injection step, and presses the intermediate mold plate 30 with a predetermined pressing force to the fixed mold plate 20 side. Not only ensures its rigidity but also acts as a heat radiating member for promoting heat radiation of the intermediate mold plate 30. Therefore, it is preferable that the heat capacity of the movable mold plate 40 be much larger than that of the intermediate mold plate 30. Further, in order to promote heat radiation, it is preferable to form a flow passage for allowing a cooling fluid to flow.
  • the heating means for preheating the movable mold plate 40 is provided at the standby position A of the movable mold plate 40 when the mold is opened, and heats the movable mold plate 40 from the outer peripheral side.
  • Induction heating coil 70 is provided at the standby position A of the movable mold plate 40 when the mold is opened, and heats the movable mold plate 40 from the outer peripheral side.
  • the induction heating coil 70 preheats the thick part 31, a part of the heat is Then, the core surface 51 B of the intermediate mold 30 is heated to a substantially uniform temperature over the entire surface.
  • the optimum temperature of the intermediate mold plate 30 preheated by the induction heating coil 70 is determined in consideration of the melting point of the material of the molded product and the temperature drop from the stop of heating to the closing of the mold and the start of injection. .
  • a hole 26 is formed in the fixed mold plate 20 at a position corresponding to the guide pin 60 so that the guide pin 60 can be guided into the hole 26 when the mold is closed. That is, at the time of closing the mold, the intermediate mold plate 30 moves toward the fixed mold plate 20 unless guided by the guide pins 60.
  • a convex portion 43 is formed on one side of the movable mold plate 40.
  • the contact surface of the convex portion 43 contacting the thin portion 3 2 is larger than the area of the core surface 5 10 B formed in the thin portion 32, and can contact the thin portion 32 entirely. It is formed as a flat surface so that it can be formed.
  • a voltage is applied to the induction heating coil 70 provided outside the thick portion 31 of the intermediate mold plate 30 to remove the thick portion 31.
  • Preheat The heat from the induction heating coil 70 is transmitted from the thick portion 31 to the thin portion 32, and heats the core surface 51B (thin portion 32) of the intermediate mold plate 30 almost uniformly over the entire surface. I do.
  • the temperature of the thin portion 32 is monitored by a temperature sensor 34. Based on the temperature detected by the temperature sensor 34, a control device (not shown) controls a voltage applied to the induction heating coil 70 and the like.
  • a driving body (not shown) is driven to move the movable mold plate 40 and the intermediate mold plate 30 toward the fixed mold plate 20. Since the intermediate mold plate 30 is supported in front of the movable mold plate 40 by the guide pins 60, the intermediate mold plate 30 is fixed to the fixed mold plate 20 before the movable mold plate 40. (See Fig. 4 (a)). At this time, the contact area between the fixed mold plate 20 and the thin portion 32 is relatively small as compared with the area of the core surface 50B. The amount of heat transferred to the template 20 is small, and the temperature of the core surface 50B does not decrease so much.
  • the driving body advances the movable mold plate 40 against the urging force of the spring 63, and brings the movable mold plate 40 into contact with the intermediate mold plate 30 (see FIG. 4 (b)). ).
  • the molten material is injected into the cavity 51 from the molding machine.
  • the timing of the start of the injection of the material can be determined, for example, based on the output of a start signal for starting the injection.
  • the intermediate mold plate 30 Since the intermediate mold plate 30 is pre-heated, the material injected from the molding machine can maintain a certain level of viscosity for a relatively long time. As a result, it is possible to obtain a molded product with high material transferability and a high transferability to every corner of the cavity 51.
  • the movable mold plate 40 Since the movable mold plate 40 is maintained at a temperature sufficiently lower than the temperature of the intermediate mold plate 30 and has a heat capacity much larger than that of the intermediate mold plate 30, it is thin after the end of the injection process. The heat of the material in the section 32 and the cavity 51 is quickly transferred to the movable mold plate 40, and the material is rapidly solidified.
  • the thin-walled part 3 2 with small heat capacity is mainly brought into contact with the movable mold plate and cooled, the temperature of the molten material injected into the cavity 51 can be quickly lowered, and the cycle time of injection molding The problem of extending the length does not occur.
  • a movable body (not shown) is driven to retract the movable mold plate 40 and the intermediate mold plate 30 from the fixed mold plate 20 to open the mold. As a result, the molded product comes off the cavity 51. .
  • the cavity surface 51A of the cavity 51 is formed on the fixed mold plate 20 side. • In the molded product, the cavity surface 51A may be formed on the intermediate mold plate 30 side.
  • FIG. 5 is a cross-sectional view of a mold according to a second embodiment of the present invention.
  • FIG. 9 is a view for explaining a positional relationship among a fixed mold plate 20, an intermediate mold plate 30 and a movable mold plate 40 when a molten material is injected from 24.
  • FIG. 5 Since the basic configuration of the mold 1 of this embodiment is the same as that described in the previous embodiment, in FIG. 5, the same parts and members as those in the first embodiment are shown in FIGS. The same reference numerals as those in the drawings are attached, and the detailed description is omitted.
  • the material injected into the cavity 52 is a metal such as a magnesium alloy, an aluminum alloy, and a zinc alloy.
  • a cavity surface 52A is formed on the intermediate mold plate 30, and an induction heating coil 72 serving as a heating means is provided on the intermediate mold plate behind the portion where the cavity surface 52A is formed.
  • the temperature control of the intermediate mold plate 30 by the induction heating coil 72 is detected by the temperature sensor 35 embedded near the cavity surface 52 A of the intermediate mold plate 30 as in the previous embodiment. This is performed based on this detection result.
  • the preheating of the intermediate mold plate 30 by the induction heating coil 72 is preferably performed at all times. However, when the material in the cavity surface 52A is solidified, the preheating by the induction heating coil 72 should be stopped in order to promote heat radiation from the material.
  • the timing of starting the injection of the material may be determined, and the preheating by the induction heating coil 72 may be stopped simultaneously with the start of the injection.
  • the intermediate mold plate 30 of this embodiment is provided with a plurality (for example, four) of the protrusion pins 58 for protruding the molded product and a uniform interval near the periphery of the cavity surface 52A. Then, by driving a driving body (not shown) provided on the movable mold plate 40 side, the tip of the protruding pin 58 protrudes from the hole 54 formed in the cavity surface 52A, and the molded product is protruded. Like that.
  • the sprue runner 2 is used in this embodiment.
  • the timing of injecting the molten material from 4 is slightly earlier than the timing of the movable mold plate 40 of the first embodiment. That is, immediately before the movable mold plate 40 comes into contact with the intermediate mold plate 30, the injection of the material M is started, and at this time, a gap is formed between the movable mold plate 40 and the intermediate mold plate 30. S is formed.
  • the gap S is shown in an enlarged manner for convenience of explanation, but in practice, 'is set so that the gap S is about several mm to several mm when starting injection. The timing is adjusted.
  • the air in the cavity 52 is smoothly discharged to the atmosphere, thereby further improving the flow of the material M in the cavity 52, increasing the flow length, and improving the transferability. It is possible to obtain a molded product having a high degree of performance.
  • the heat capacity of the intermediate mold plate 30 is large, it is suitable for forming a metal such as magnesium having a relatively long forming cycle. Even if the heat capacity of the intermediate mold 30 is large, the material injected into the cavity 52 is a metal with high thermal conductivity, so the heat of the intermediate mold plate 30 is only from the movable mold plate 40. Instead, a large amount of heat is radiated from the fixed mold plate 20 via the material in the cavity 52.
  • the intermediate mold plate 300 is divided into an outer portion 301 supported by guide pins 60 (see FIG. 2) and an outer portion 301 31 and an inner portion 302 having a cavity 5100.
  • a groove 304 is formed over the entire periphery. Then, the outer peripheral edge of the inner portion 302 is fitted into the groove 304.
  • the outer portion 301 may be formed of a heat insulating member such as a ceramic, and the inner portion 302 may be integrally provided with the induction heating coil 72 as described in the second embodiment.
  • a hole 315 through which the guide pin 60 passes is formed along the outer peripheral edge of the intermediate mold plate 310. Are formed at equal intervals.
  • Each of the holes 3 15 is formed as an elongated hole extending radially from the center of the intermediate mold plate 3 10. The length of the hole 3 15 in the longitudinal direction is determined in consideration of the amount of thermal expansion of the intermediate mold plate 3 10 due to preheating.
  • the intermediate mold plate 310 supported by the guide bin 60 is radiated from the center of the intermediate mold plate 310 in the radial direction. Thermal expansion occurs at almost the same ratio.
  • the hole 3 15 through which the guide pin 60 passes is formed in the shape of a long hole having a long axis in the same direction as the direction of the thermal expansion.
  • the positional relationship between the cavities 24 and the cavities 5 20 can be kept constant.
  • FIG. 6 (b) shows a circular movable mold 9, but the same applies to other rectangular movable molds.
  • two guide pins are provided at the center of the mold, and the holes of the third mold plate passing therethrough are formed into elongated holes extending horizontally from the center of the third mold plate. It is good to form.
  • the cavity surface 52OA is formed on the intermediate mold plate 310, it may be formed on the fixed mold plate side as described above.
  • FIG. 7 is a longitudinal sectional view for explaining the configuration of a mold according to a fifth embodiment of the present invention.
  • FIG. 7 (a) shows a mold in an open state
  • FIG. 7 (b) shows an intermediate mold attached to a fixed mold plate. This shows the case when the plate is in contact.
  • the mold configuration of the fifth embodiment is basically the same as the mold of the first embodiment, except that the intermediate mold plate shown in FIG. 6 (a) is used. I have. Therefore, the same portions and the same members as those of the first and third embodiments are denoted by the same reference numerals, and detailed description is omitted.
  • an induction heating coil 75 as a heating means is provided on one surface (the surface of the convex portion 43) of the movable mold plate 40 facing the intermediate mold plate 300.
  • the intermediate mold plate 300 is thermally independent, and the induction heating coil 75 A gap S ′ is provided to allow induction heating of the intermediate mold plate 300 by the method.
  • the movable mold plate 40 and the intermediate mold plate 300 move to the fixed mold plate 20 while keeping the gap S' as shown in Fig. 7 (b). I do.
  • the intermediate mold plate 300 contacts the fixed mold plate 20 and immediately before the movable mold plate 40 contacts the intermediate mold plate 300, the intermediate mold using the induction heating coil 75 The heating of plate 300 is stopped.
  • the intermediate mold plate 300 can be heated by the induction heating coil 75 until just before injection, and the core surface 5100B can be kept at a certain temperature or higher. Also, compared with the case where the induction heating coil is provided on the intermediate mold plate, the heat capacity of the intermediate mold plate 300 can be made much smaller, so that heat exchange can be performed advantageously. There are advantages.
  • the core surface 5100B of the intermediate mold plate 300 is preheated by the induction heating coil .75, the material spreads to every corner of the cavity 5100, and the transferability is improved. A molded article having a good quality can be obtained. Further, since the heat capacity of the intermediate mold plate 300 can be made extremely small as compared with the fixed mold plate 20 and the movable mold plate 40, the heat of the material filled in the cavity 5100 can be reduced. Quickly dissipates heat and the material solidifies in a short time.
  • the first mold plate is described as a fixed mold plate
  • the second mold plate is described as a movable mold plate.
  • the first mold plate is described as a movable mold plate.
  • the second mold plate may be used as a fixed mold plate.
  • the present invention is not limited to such single-cavity molding, but can be applied to a multi-cavity mold plate.
  • the present invention can be applied to a mold having a plurality of sprue runners in one cavity.
  • the driving body for driving the movable mold plate and the driving body for driving the intermediate mold plate may be separate or common.
  • the case where only one sprue runner is provided per capita has been described.
  • the present invention can be applied to a mold in which a plurality of sprue runners are provided in one cavity.
  • the injection start timing is determined based on the start signal
  • the injection start timing is determined based on the detection results of the cavity and the temperature sensor embedded in the slug pocket of the cavity. It is also possible.
  • a molded article having excellent transferability can be obtained by preheating the cavity surface or the core surface to a predetermined temperature.
  • this preheating can be performed promptly and a mold with a large heat capacity By pressing the plate, the material injected into the cavity can be cooled quickly, so that the cycle time of injection molding is not extended.
  • the present invention is applicable to all injection molding machine dies such as cold runner type, hot and runner type, die casting, etc., as long as they are molds of injection molding machines that form molded products by injecting materials into cavities. Is possible. Further, the present invention can be applied to not only resin but also metal injection molding.

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

Abstract

L'invention concerne un procédé de moulage par injection à l'aide d'un moule métallique comprenant une plaque ouvrable et une empreinte formée dans la plaque et capable de conserver au matériau injecté une excellente aptitude à l'écoulement, de donner un produit moulé d'excellente transférabilité, de favoriser une rapide dissipation de la chaleur issue de la résine fondue ou du métal fondu injecté(e) dans l'empreinte de telle façon qu'une durée de cycle du moulage par injection ne soit pas prolongée. Une plaque en mince feuille comporte une surface d'empreinte ou une surface principale de l'empreinte est installée indépendamment de la plaque de moule métallique, la surface d'empreinte ou la surface principale formée sur la plaque est maintenue à une température spécifique au moment de l'injection. La plaque de moule métallique est amenée en contact avec la plaque de moule lorsque le moulage par injection est réalisé, et la déformation de la plaque moule est supprimée par la plaque de moule métallique et enfin la plaque de moule est refroidie.
PCT/JP2000/004221 2000-06-27 2000-06-27 Moule metallique destine a une machine a injecter et procede de moulage par injection utilisant ce moule metallique WO2002000415A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2000/004221 WO2002000415A1 (fr) 2000-06-27 2000-06-27 Moule metallique destine a une machine a injecter et procede de moulage par injection utilisant ce moule metallique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2000/004221 WO2002000415A1 (fr) 2000-06-27 2000-06-27 Moule metallique destine a une machine a injecter et procede de moulage par injection utilisant ce moule metallique

Publications (1)

Publication Number Publication Date
WO2002000415A1 true WO2002000415A1 (fr) 2002-01-03

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PCT/JP2000/004221 WO2002000415A1 (fr) 2000-06-27 2000-06-27 Moule metallique destine a une machine a injecter et procede de moulage par injection utilisant ce moule metallique

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003062884A (ja) * 2001-08-29 2003-03-05 Murata Mfg Co Ltd 射出成形装置
WO2006112571A1 (fr) 2005-03-24 2006-10-26 Myung-Ho Kang Moule pour machine de moulage par injection
EP1919686A1 (fr) * 2005-08-30 2008-05-14 Myung-Ho Kang Appareil de moulage par injection comprenant un moule de type séparation et son procédé de commande
CN102476180A (zh) * 2010-11-23 2012-05-30 苏州春兴精工股份有限公司 适用于平板薄壁件的卡模解决方法
WO2017088422A1 (fr) * 2015-11-25 2017-06-01 深圳市华腾精密机械有限公司 Moule destiné au moulage d'alliage d'aluminium par injection

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS574748A (en) * 1980-06-11 1982-01-11 Asahi Chem Ind Co Ltd Injection molding equipment
JPH08132498A (ja) * 1994-11-10 1996-05-28 Ricoh Co Ltd 光ディスクの成形方法及び成形装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS574748A (en) * 1980-06-11 1982-01-11 Asahi Chem Ind Co Ltd Injection molding equipment
JPH08132498A (ja) * 1994-11-10 1996-05-28 Ricoh Co Ltd 光ディスクの成形方法及び成形装置

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003062884A (ja) * 2001-08-29 2003-03-05 Murata Mfg Co Ltd 射出成形装置
WO2006112571A1 (fr) 2005-03-24 2006-10-26 Myung-Ho Kang Moule pour machine de moulage par injection
EP1861235A1 (fr) * 2005-03-24 2007-12-05 Myung-Ho Kang Moule pour machine de moulage par injection
EP1861235A4 (fr) * 2005-03-24 2009-07-08 Myung-Ho Kang Moule pour machine de moulage par injection
JP4865734B2 (ja) * 2005-03-24 2012-02-01 ミュン ホ カン 射出成形機用金型装置
EP1919686A1 (fr) * 2005-08-30 2008-05-14 Myung-Ho Kang Appareil de moulage par injection comprenant un moule de type séparation et son procédé de commande
EP1919686A4 (fr) * 2005-08-30 2009-09-02 Myung-Ho Kang Appareil de moulage par injection comprenant un moule de type séparation et son procédé de commande
CN102476180A (zh) * 2010-11-23 2012-05-30 苏州春兴精工股份有限公司 适用于平板薄壁件的卡模解决方法
WO2017088422A1 (fr) * 2015-11-25 2017-06-01 深圳市华腾精密机械有限公司 Moule destiné au moulage d'alliage d'aluminium par injection

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