JP7057963B2 - Molding system - Google Patents

Description

The present invention relates to a molding system for thermosetting resin materials.

For example, in the conventional transfer molding machine disclosed in Patent Document 1, a molding material such as rubber for molding is loaded into a pot, a plunger is pushed into the pot, the molding material in the pot is pressurized, and the molding material in the pot is pressed through a press-fit hole. , Press-fit into the hollow part (cavity) of the sealed and heated mold to mold. Such a molding method is also used for molding a product made of a thermosetting resin material.

Japanese Unexamined Patent Publication No. 8-281649

The transfer molding machine loads a tablet, which is a molding material, into a pot for each molding operation to mold a product, and such a tablet is manufactured in a separate process independent of the molding process as described above. I needed it.

Therefore, an object of the present invention is to provide a molding system for a thermosetting resin that can be molded without manufacturing a tablet.

In order to achieve the above object, the molding system according to the present invention is a molding system for a thermosetting resin material, which is a supply unit for supplying a thermosetting resin material melted in a pot, and a supply unit in the pot. It is characterized by having an injection unit for pushing a thermosetting resin material into a cavity of a mold with a plunger.

According to the present invention, the molten thermosetting resin material is supplied into the pot and pushed into the cavity of the mold with a plunger. Since this is done, the molten thermosetting resin material can be directly supplied to the pot, so that the thermosetting resin material can be continuously supplied and pushed into the cavity.

In the present invention, the mold has a pot and a resin flow path that communicates the pot with the outside, and the supply unit has a cylinder with an open tip and a screw housed in the cylinder. However, the tip is arranged toward the mold, is movable in the axial direction, and is configured to communicate with the resin flow path when the tip comes into contact with the mold . The inner diameter of the cylinder is constant from the position where the screw is arranged in the cylinder to the opening at the tip . By doing so, the cylinder can be brought into direct contact with the mold, and the thermosetting resin material melted in the cylinder can be supplied into the pot through the resin flow path. Further, by putting the thermosetting resin material and the fiber material into the cylinder, it is possible to knead them with a screw so that they are effectively mixed. Further, unlike normal injection molding, the structure does not have a nozzle at the tip of the cylinder, so that it is possible to prevent the molten resin from being cured in the nozzle.

In the present invention, it is preferable that the screw is provided so as to be movable so as to block the resin flow path at the tip of the screw when the tip of the cylinder is in contact with the mold. By doing so, when the thermosetting resin material in the pot is pushed into the cavity, the screw is moved so as to block the resin flow path, so that the backflow to the cylinder can be prevented.

In the present invention, it is preferable to further have a heating device for heating the tip of the cylinder. It is preferable that the heating device has an induction heating type heater. It is preferable to further have a cooling device for cooling the portion closer to the base end than the tip end portion of the cylinder. By doing so, the amount of heat applied to the thermosetting resin material can be further reduced, and the resin viscosity can be effectively lowered while suppressing an increase in the cumulative amount of heat applied to the thermosetting resin material. By suppressing the increase in the cumulative amount of heat, it is possible to suppress the thermosetting resin material from being cured in the cylinder, and by lowering the resin viscosity, it is possible to suppress breakage when the long fibers are kneaded.
In order to achieve the above object, the molding system according to the present invention is a molding system for a thermosetting resin material, which is a supply unit for supplying a thermosetting resin material melted in a pot, and a supply unit in the pot. It has an injection unit that pushes a thermosetting resin material into the cavity of a mold with a plunger, and the mold is formed with the pot and a resin flow path that connects the pot and the outside, and the supply unit. However, it has a cylinder having an open tip and a screw housed in the cylinder, and the cylinder is arranged with the tip facing the mold, is movable in the axial direction, and the tip hits the mold. A heating device that is configured to communicate with the resin flow path when in contact with the resin flow path, and the molding system instantly heats the tip of the cylinder and a cooling device that cools a portion closer to the base than the tip of the cylinder. And, further, the heating device is characterized by having an induction heating type heater.

According to the present invention, a product made of a thermosetting resin material can be molded without manufacturing a tablet.

It is sectional drawing of the main part of the molding system which concerns on one Embodiment of this invention. It is a figure explaining the weighing operation in the molding system of FIG. It is a figure explaining the injection operation in the molding system of FIG. It is a figure explaining the curing waiting operation in the molding system of FIG. It is a figure explaining the product take-out operation in the molding system of FIG.

Hereinafter, a molding system for a thermosetting resin material according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5.

FIG. 1 is a cross-sectional view of a main part of a molding system according to an embodiment of the present invention. 2 to 5 are diagrams illustrating a weighing operation, an injection operation, a curing waiting operation, and a product take-out operation in the molding system of FIG. 1, respectively.

The molding system 10 according to the present embodiment injects (pushes) the melted thermosetting resin material P into the cavity 8 of the mold 1 and then cures the product to form a product.

The mold 1 has an upper mold 2, a middle mold 3, and a lower mold 4 arranged in order from the upper side to the lower side in each drawing. The upper mold 2 is formed with a pot 5 which is a columnar space penetrating in the vertical direction. Further, a first resin flow path 6 for communicating the pot 5 and the outside of the mold 1 is formed between the upper mold 2 and the middle mold 3. The middle mold 3 is formed with a second resin flow path 7 penetrating in the vertical direction. A cavity 8 is formed between the middle mold 3 and the lower mold 4. The second resin flow path 7 communicates the pot 5 with the cavity 8. A recess 9 is formed on the side surface of the mold 1, and a first resin flow path 6 is opened in the central portion of the recess 9. Further, the mold 1 is provided with a heater (not shown) for heating and curing the thermosetting resin material filled in the cavity 8.

The molding system 10 uses a supply unit 20 for supplying the thermosetting resin material P (hereinafter, simply referred to as “resin material P”) melted in the pot 5 of the mold 1 and the resin material P in the pot 5 to be molded. It has an injection plunger 30 as an injection unit to be pushed into the cavity 8 of 1.

The supply unit 20 includes a cylinder 21, a screw 22, a heating device 23, a cooling device 24, a cylinder drive unit (not shown), and a screw drive unit (not shown).

The cylinder 21 is formed in a cylindrical shape in which the tip 21a is opened, and the tip 21a is arranged toward the mold. The tip 21a has a shape that can be fitted into the recess 9 of the mold 1. The cylinder 21 is moved in the axial direction (left-right direction in each drawing) by a cylinder drive unit (not shown).

The screw 22 is housed in the cylinder 21, is rotated in the cylinder 21 by a screw drive unit (not shown), and is moved in the axial direction (left-right direction in each drawing).

The heating device 23 is provided at the tip end portion 21b of the cylinder 21. The heating device 23 has an induction heating type heater (Induction Heating; IH). Since the induction heating type heater has a relatively high heating rate, the tip portion 21b of the cylinder 21 can be heated instantaneously. In addition to the induction heating type heater, the heating device 23 may have other types of heaters such as a resistance heating element and a conduit through which the heated heat exchange medium flows, but the temperature rise rate is high and the cylinder 21 A heater that instantly heats is preferable. A band heater generally used has a heating rate of about 0.28 ° C./sec, but an induction heating type heater can realize 8.8 ° C./sec. In the present specification, "instantaneous heating" means that the heating rate is 8 ° C./sec or more.

The cooling device 24 is provided in a portion of the cylinder 21 closer to the base end (the end opposite to the tip end 21a) than the tip end portion 21b in order to transport the resin material forward in a solid state without melting. The cooling device 24 has a conduit through which a relatively low temperature heat exchange medium such as water flows. The cooling device 24 can cool the cylinder 21.

The injection plunger 30 has a plunger drive unit (not shown) that moves the plunger tip 31 movably housed in the pot 5 of the mold 1 in the vertical direction.

Further, the molding system 10 has a control unit (not shown) that controls the overall operation. The control unit includes, for example, a microcomputer for an embedded device having a CPU, ROM, RAM, EEPROM, various I / O interfaces, and the like. The control unit controls each drive unit of the molding system 10 in various operations such as a mold closing operation, a weighing operation, an injection operation, a curing waiting operation, a mold opening operation, and a product taking-out operation.

Next, an example of the operation according to the present invention in the molding system 10 of the present embodiment described above will be described.

The control unit of the molding system 10 controls a mold drive unit (not shown) to superimpose the upper mold 2, the middle mold 3, and the lower mold 4 and fasten the mold (mold closing operation). Further, the resin material P in the cylinder 21 is kneaded and melted by the screw 22.

The control unit controls the cylinder drive unit to move (that is, advance) the cylinder 21 so as to approach the mold 1, and the tip 21a is fitted into the recess 9 as shown in FIG. In this state, the inside of the cylinder 21 and the first resin flow path 6 of the mold 1 are communicated with each other, and the tip 22a of the screw 22 faces the first resin flow path 6 with a gap. Then, the control unit controls the screw drive unit to advance the screw 22 to a predetermined position.

Next, the control unit controls the heating device 23 to instantly heat the cylinder 21. This lowers the viscosity of the resin material P. By heating instantaneously, the heating time of the resin material P in the cylinder 21 can be shortened, the amount of heat applied to the resin material P can be reduced, and the increase in the cumulative amount of heat applied to the resin material P can be suppressed. .. In the present embodiment, the cylinder 21 is heated to such an extent that the resin material P reaches 150 ° C. to 160 ° C. Further, the control unit controls the screw drive unit to rotate the screw 22 and supply the amount of resin material P required for one injection into the pot 5 through the first resin flow path 6 (measurement operation). .. In the weighing operation, the plunger tip 31 is lifted upward by the resin material P flowing into the pot 5. When the supply of the resin material P into the pot 5 is completed, the control unit controls the heating device 23 to stop the heating of the cylinder 21.

Next, the control unit controls the screw drive unit to stop the rotation of the screw 22 and advance the screw 22 so that the tip 22a is brought into contact with the mold 1 as shown in FIG. 3, and the first resin flow path is formed. Block 6 This prevents the resin material P from flowing back from the first resin flow path 6 to the cylinder 21. Then, the control unit controls the plunger drive unit to push down the plunger tip 31 downward. As a result, the resin material P in the pot 5 is pushed into the cavity 8 through the second resin flow path 7 (injection operation).

Next, the control unit controls the heater of the mold 1 to heat the resin material P in the cavity 8 so as to be cured (curing waiting operation). In parallel with this, the control unit controls the cylinder drive unit to move (that is, retract) the cylinder 21 away from the mold 1, and as shown in FIG. 4, the tip 21a and the recess 9 are fitted together. Is released. Further, the control unit controls the screw drive unit to retract the screw 22 until the tip 22a comes to a position corresponding to the cooling device 24. Further, the control unit controls the cooling device 24 to cool the cylinder 21. As a result, the amount of heat applied to the resin material P in the cylinder 21 is reduced, and an increase in the cumulative amount of heat applied to the resin material P is suppressed.

Next, the control unit controls the mold drive unit to open the upper mold 2, the middle mold 3, and the lower mold 4 in the vertical direction (mold opening operation), and the product S is opened from the cavity 8 by an eject pin (not shown). And remove the runner R (product removal operation).

After that, the product S is molded by repeating the mold closing operation and the product taking-out operation.

As described above, according to the molding system 10 of the present embodiment, the molten resin material P is supplied into the pot 5 and pushed into the cavity 8 of the mold 1 by the plunger tip 31. Since this is done, the molten resin material P can be directly supplied to the pot 5, so that the resin material P can be continuously supplied and the 8 can be continuously pushed into the cavity. Therefore, the product S made of the thermosetting resin material P can be molded without manufacturing the tablet.

Further, the pot 5 and the first resin flow path 6 that communicates the pot 5 with the outside are formed in the mold 1, and the supply unit 20 is housed in the cylinder 21 having the tip 21a opened and the cylinder 21. It has a screw 22 and. Then, the cylinder 21 is arranged with the tip 21a facing the mold, is movable in the axial direction, and when the tip 21a comes into contact with the mold 1, it communicates with the first resin flow path 6. By doing so, the cylinder 21 can be brought into direct contact with the mold 1 and the resin material P melted in the cylinder 21 can be supplied into the pot through the first resin flow path 6. Further, by putting the resin material P and the fiber material into the cylinder 21, the resin material P and the fiber material can be kneaded by the screw 22 so as to be effectively mixed with each other. Further, since the structure does not have a nozzle at the tip of the cylinder 21, it is possible to prevent the molten resin from being cured in the nozzle.

Further, the screw 22 is movably provided so as to block the first resin flow path 6 at the tip 22a of the screw 22 when the tip 21a of the cylinder 21 is in contact with the mold 1. By doing so, when the resin material P in the pot 5 is pushed into the cavity 8, the screw 22 is moved so as to block the first resin flow path 6, so that backflow to the cylinder 21 can be prevented.

Further, it further has a heating device 23 that instantly heats the tip end portion 21b of the cylinder 21. The heating device 23 has an induction heating type heater. Further, it has a cooling device 24 for cooling a portion closer to the base end than the tip end portion 21b of the cylinder 21. By doing so, the amount of heat applied to the resin material P can be further reduced, and the resin viscosity can be effectively lowered while suppressing an increase in the cumulative amount of heat applied to the resin material P. By suppressing the increase in the cumulative amount of heat, it is possible to suppress the thermosetting resin material P from being cured in the cylinder 21, and by lowering the resin viscosity, it is possible to suppress breakage when the long fibers are kneaded. ..

In the description of the above-described embodiment, the main components of the supply unit 20 and the injection plunger 30 included in the molding system are shown. However, the injection molding machine having a cylinder and a screw has components common to the supply unit 20. The transfer molding machine has components in common with the injection plunger 30. Therefore, the molding system of the present invention may be realized by configuring the supply unit 20 based on the injection molding machine and configuring the injection plunger 30 based on the transfer molding machine and combining them.

Although embodiments of the present invention have been described above, the present invention is not limited to these examples. As long as the gist of the present invention is provided, a person skilled in the art may add, delete, or change the design of the above-described embodiment as appropriate, or combine the features of the embodiment as appropriate. Included in the scope of the invention.

1 ... mold, 2 ... upper mold, 3 ... middle mold, 4 ... lower mold, 5 ... pot, 6 ... first resin flow path, 7 ... second resin flow path, 8 ... cavity, 9 ... recess 10, ... Molding system, 20 ... Supply unit, 21 ... Cylinder, 21a ... Cylinder tip, 21b ... Cylinder tip, 22 ... Screw, 22a ... Screw tip, 23 ... Heating device, 24 ... Cooling device, 30 ... Injection plunger, 31 ... plunger tip, P ... thermosetting resin material, R ... runner, S ... product

Claims (6)

A molding system for thermosetting resin materials
A supply unit that supplies the molten thermosetting resin material into the pot,
It has an injection unit that pushes the thermosetting resin material in the pot into the cavity of the mold with a plunger.
The pot and a resin flow path that communicates the pot with the outside are formed in the mold.
The supply unit has a cylinder with an open tip and a screw housed in the cylinder.
The cylinder is configured such that the tip is arranged toward the mold, is movable in the axial direction, and communicates with the resin flow path when the tip abuts on the mold.
A molding system characterized in that the inner diameter of the cylinder is constant from the position where the screw is arranged in the cylinder to the opening at the tip . The first aspect of the present invention is characterized in that the screw is provided so as to be movable so as to block the resin flow path with the tip of the screw when the tip of the cylinder is in contact with the mold. Molding system. The molding system according to claim 1 or 2 , further comprising a heating device for heating the tip of the cylinder. The molding system according to claim 3 , wherein the heating device has an induction heating type heater. The molding system according to claim 4 , further comprising a cooling device for cooling a portion closer to the base end than the tip end portion of the cylinder. A molding system for thermosetting resin materials
A supply unit that supplies the molten thermosetting resin material into the pot,
It has an injection unit that pushes the thermosetting resin material in the pot into the cavity of the mold with a plunger.
The pot and a resin flow path that communicates the pot with the outside are formed in the mold.
The supply unit has a cylinder with an open tip and a screw housed in the cylinder.
The cylinder is configured such that the tip is arranged toward the mold, is movable in the axial direction, and communicates with the resin flow path when the tip abuts on the mold.
The molding system further includes a heating device that instantly heats the tip end portion of the cylinder, and a cooling device that cools a portion closer to the base end portion than the tip end portion of the cylinder.
A molding system in which the heating device has an induction heating type heater.

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