JP3099300U - Combination device of transfer cylinder and transfer plunger of transfer molding machine - Google Patents

Abstract

To prevent bubbles in a transfer molded product.
A transfer cylinder includes a cylinder body, the cylinder body penetrating through two ends in the axial direction, a resin injection hole provided in a circumferential portion of the cylinder body and communicating with the hole, and An airtight gate which is hingedly connected to the cylinder body and is used to close the resin injection hole; and two pipe joints 20 and 21 which are screwed to the cylinder body circumference and communicate with the holes. Is connected to a vacuum pump and a vacuum controller by a pipe. The material softened by heating is introduced into the hole through the resin injection hole 15 when the gate 16 is opened, and after the gate is closed, the air in the hole is sucked by a vacuum pump to make a vacuum, Further, the material is pressed into the cavity by the transfer plunger 24 so that the product does not contain bubbles.
[Selection diagram] Fig. 4

Description

The present invention relates to a transfer cylinder and transfer plunger combination device of a kind of transfer molding machine, and in particular, the transfer plunger presses a material after heating and softening into a cavity from a vacuum transfer cylinder to contain air bubbles in a product. To a device that prevents

(4) In transfer molding, a thermosetting resin powder or a small lump formed in advance by pressure is put into a pot above a mold, heated and plasticized to form a liquid, and pressed into a lower cavity. The thermosetting resin is molded at least under pressure during a necessary polymerization time in a transfer molding die. In addition, most of the raw materials used are pre-press molded, the material is dense and the volume is reduced, so that both the time for loading and heating the material are reduced, and the thermosetting resin forms a polymerization action. Therefore, there is no need to worry about softening again, and therefore there is no need to cool the mold and release it from a low temperature, so that the entire working time can be greatly reduced. The material that has entered the cavity has a very high plasticity and is close to a liquid state. At this time, there is not much pressure applied to the cavity, and when inserting a small insert part into the mold, the impact of the resin Will not move. That is, when a resin product having a metal insert component is manufactured by this method, the insert component can be fitted into the resin at an accurate position, which is a special advantage of transfer molding. In addition, since the material approaches the liquid state and the fluidity is very high, it is complicated, irregular or has a very large change in cross-section, such as electronic devices such as diodes, transistors, integrated circuits and light emitting diodes. Can be used for manufacturing.

FIG. 1 is a sectional view of the upper mold 51 and the lower mold 52 of the transfer molding die 50 when separated. FIG. 2 shows a situation in which the heated and softened material 40 is put into the transfer cylinder 53 and pushed out by the transfer plunger 54 after the mold 50 is clamped. FIG. 3 shows a situation in which the material 40 is pressed into the cavity 58 through the sprue runner 55 by lowering the transfer plunger 54. After the product is pressed and cured, the mold is opened and removed.

前 Before the transfer plunger 54 descends and enters the transfer cylinder 53, the transfer plunger 54 and the transfer cylinder 53 are separated from each other, and the transfer cylinder 54 and the atmosphere communicate with each other and are filled with air S. When the material 40 is pressed into the cavity using the transfer plunger 54, the air S in the transfer cylinder 53 is also pressed into the cavity 58, and the product contains bubbles.

Spacers 56 are provided around the four sides of the upper mold 51 and the lower mold 52. When the molds are clamped, a cushion pad 57 produces a tight bonding effect, and the vacuum pump sucks air between the upper mold 51 and the lower mold 52. , During which a vacuum is formed. Since this part is not within the scope of the present invention, detailed description is omitted.

気 泡 Bubbles in electronic devices form scratches on the appearance and affect the performance of electronic devices. For light emitting diodes, the bubbles in the LED create irregular scattering of the light beam, which significantly reduces light collection and brightness. Bubbles in other electronic components expand when exposed to high temperatures and, in severe cases, damage electronic devices. For this reason, the presence of bubbles in the electronic device is not allowed. Electronic components manufactured by well-known transfer molding tend to generate unacceptable air bubbles.

The present inventor studied and tentatively extended the length of the transfer cylinder, provided a resin charging hole in the front of the cylinder body, closed the resin charging hole with an airtight gate, and changed the plunger head of the transfer plunger with the transfer cylinder as needed. It is slidably combined and held in a sealed state, the gate is opened, the material is charged into the transfer cylinder from the resin charging hole, the transfer cylinder is closed, and the air in the transfer cylinder is sucked out by a vacuum pump until a vacuum is achieved. It has been found that by injecting the material into the cavity with the plunger, it is possible to prevent air from entering the cavity during the press-in operation.

Accordingly, a main object of the present invention is to provide a kind of improved transfer cylinder and transfer plunger combination device, which extracts air in the transfer cylinder after charging the material into the transfer cylinder. Then, the material is brought into a vacuum state, and further, the material is used to press the material into the cavity by the transfer plunger, so that it is possible to prevent the product from containing unacceptable air bubbles.

According to a first aspect of the present invention, there is provided a transfer cylinder / transfer plunger combination apparatus for a transfer molding machine, comprising a transfer cylinder and a transfer plunger, the transfer cylinder comprising a cylinder body, and penetrating the cylinder body at two axial ends. A hole, a resin injection hole communicating with the hole, an airtight gate joined to the cylinder body by a hinge to serve to close the resin injection hole, and two females provided on the cylinder body and communicating with the hole. A screw is provided, and the female screw is connected to a line of a vacuum pump and a vacuum controller,
The transfer plunger includes a plunger body, a threaded portion is provided at one end of the plunger body, an outer diameter of an opposing end is enlarged to form a plunger head, and a plurality of O-rings are provided on the plunger head, and When the transfer plunger is at the upper limit of movement, some of the plunger heads are located in the holes of the transfer cylinder, and the plunger head is slidable in the transfer cylinder and at least one O-ring is provided between the plunger head and the transfer cylinder. Form a sealed state between the holes in the cylinder,
When the gate is opened, the lump of material after heating and softening is injected into the hole of the transfer cylinder from the resin injection hole, and after the gate is closed, the air in the hole is sucked out by the vacuum pump until the air reaches the set vacuum degree. The transfer plunger is used to press-fit a material into a cavity of a metal mold. The transfer plunger has a transfer cylinder and a transfer plunger.
According to a second aspect of the present invention, in the transfer cylinder / transfer plunger combination device of the first aspect, the inner diameter of the hole of the transfer cylinder is larger than the outer diameter of the bulk material, whereby the material is injected into the hole. After that, a gap is generated between the transfer cylinder and the material, and the apparatus is a combination device of a transfer cylinder and a transfer plunger of a transfer molding machine.
According to a third aspect of the present invention, in the combined apparatus of the transfer cylinder and the transfer plunger of the transfer molding machine according to the first or second aspect, a seal pad around the gate is provided, and a magnet coated on the seal pad is embedded. The gate is tightly closed by magnetic force, and the transfer cylinder and the transfer plunger of the transfer molding machine are combined.

The transfer cylinder and transfer plunger combination device according to the present invention is designed so that after the material is charged into the transfer cylinder, the transfer cylinder is depressurized and evacuated, and the transfer plunger presses the material into the cavity. It contains no unacceptable air bubbles, is very advantageous for ensuring the quality and appearance of the product, has extremely industrial value, and meets the requirements for novelty and inventive step of utility model registration.

According to the transfer cylinder and transfer plunger combination device of the transfer molding machine of the present invention, the transfer cylinder has a cylinder body, and the cylinder body is provided in a hole penetrating two ends in the axial direction and a cylinder body circumference. A resin injection hole communicating with the hole, an airtight gate connected to the cylinder body by a hinge and used to close the resin injection hole, and two pipe joints screwed to the cylinder body circumferential portion and communicating with the hole. The other ends of the two fittings are connected by lines to a vacuum pump and a vacuum controller. A plurality of O-rings are provided on the plunger head of the transfer plunger to form a good slidable sealed state between the plunger head and the transfer cylinder. After being charged into the hole and closing the gate, the air in the hole is sucked out to a vacuum by a vacuum pump, and the resin is pressed into the cavity by a plunger.

4 to 6 show an embodiment of the transfer cylinder and transfer plunger combination device 10 of the transfer molding machine of the present invention. The transfer cylinder 11 includes a cylinder body 12 having a generally cylindrical shape. The cylinder body 12 includes a hole 13 penetrating two ends in the axial direction, and accommodates a bulk material 40 in the hole 13. The transfer plunger 24 is supported to be able to move up and down. The above-mentioned cylinder body 12 has a flat surface 14 at its circumferential portion, and a resin injection hole 15 is provided in the flat surface 14. The resin injection hole 15 communicates with the hole 13, and the shape of the resin injection hole 15 is limited. Instead, it can be circular, square or any other shape. However, it is preferable that the shape of the resin injection hole 15 is circular so that the resin injection hole 15 can be easily formed, which is convenient for drilling. The epoxy resin material 40 which has been softened by heating at a high frequency is injected into the hole 13 through the resin injection hole 15 and is supplied to the transfer plunger 24 for press-fitting into the cavity 38 (FIG. 8). This design and the method of charging the material from the upper opening of the known transfer cylinder are greatly different. In the preferred embodiment, the inner diameter of the transfer cylinder bore 13 is greater than the diameter of the solid material 40, the purpose of which is to create a gap 22 between the two after the material 40 has been introduced into the bore 13 (FIG. 9). The air between the upper mold 31 and the lower mold 32 is sucked out by the gap 22 at the time of mold clamping, so that another duct for decompression is formed in addition to the existing decompression path, and the decompression efficiency is improved. Enhanced. The transfer cylinder 11 further includes a gate 16 whose lower part is joined to the cylinder main body 12 by a hinge, and the resin injection hole 15 is closed by the gate 16. A seal pad 17 is fitted around the gate 16 to form an airtight state between the cylinder body 12 and the gate 16 when the gate 16 is opened, so that air passes through the seal pad 17 and enters the hole 13. Can be prevented. Since the operation is performed in a high temperature environment of about 150 degrees Celsius, the seal pad 17 has heat resistance. In the illustrated embodiment, a strong magnet (not shown) further covered by a sealing pad 17 is embedded above the gate 16 so that the gate 16 can be tightly closed by magnetic force. In practice, when the transfer cylinder 11 is evacuated, a pressure difference is created between the inside and the outside of the transfer cylinder 11 so that atmospheric pressure tightens the gate 16 and tightly couples it with the cylinder body 12. Therefore, there is no danger of leakage. Leakage means that the atmosphere passes through the seal pad 17 and enters the hole 13.

The above-mentioned transfer cylinder 11 has two female screws 18 and 19 provided on a circumferential portion of the cylinder body 12 and communicating with the hole 13, of which a first pipe joint 20 is screwed to the first female screw 18. The other end of the pipe joint 20 is connected to a vacuum pump via a pipe (not shown), and when the material 40 is charged into the hole 13 of the transfer cylinder and the gate 16 is closed, the air in the hole 13 is released by the vacuum pump. It is sucked out and made into a vacuum. A second pipe joint 21 is screwed into the second female screw 19, and the other end of the pipe joint 21 is connected to a vacuum controller (not shown) via a pipe, and the vacuum controller connects the hole 13 to a predetermined vacuum. Control to turn off the vacuum pump when the temperature reaches a certain level, automatically stop the decompression operation of the vacuum pump, and generate an alarm signal that is visually and / or audibly sensed, so that the operator can perform the material press-in operation. Prompt. Since the above-mentioned atmospheric pressure control circuit belongs to a well-known technique and is not within the scope of the present invention, a detailed description thereof will be omitted.

Further, as shown in FIGS. 4 and 5, the transfer plunger 24 includes a plunger main body 25, and a screw portion 26 is provided at one end of the plunger main body 25, and driving means such as a piston rod (not shown) of a hydraulic cylinder is provided. ) Is screwed, the outer diameter of the opposite end is enlarged to form a plunger head 27, and a plurality of annular grooves 28 are formed on the outer periphery of the plunger head 27, and an O-ring 29 is provided in each annular groove 28. The function of the O-rings 29 is to form a sealed state between the plunger head 27 and the hole 13 of the transfer cylinder so as to slidably hold the plunger head 27, thereby preventing air leakage from the O-ring 29. To prevent. Leakage refers to the atmosphere passing through the O-ring 29 and entering the hole 13 below the plunger head 27. Once leaked, air bubbles form in the product.

違 い The differences from the well-known technology of the present invention are as follows. In the well-known technique, the material is supplied from above (or from the side) of the transfer cylinder, and the transfer plunger and the transfer cylinder are separated from each other. Therefore, the transfer plunger descends and enters the transfer cylinder to compress the material. At this time, the transfer cylinder and the atmosphere communicate with each other to fill with air, and the air in the transfer cylinder is one of the causes of generating bubbles in the product. In contrast, when the transfer plunger 24 of the present invention is at the upper limit, the plunger head 27 is located in the hole 13 of the transfer cylinder (FIG. 5), and at least one O-ring 29 is slidable in the transfer cylinder. Thus, a sealed state of the hole 13 of the transfer cylinder is formed (FIG. 5). That is, the plunger head 27 and the transfer cylinder 11 are connected in any of the separation of the mold (FIG. 7), the mold clamping (FIG. 8) and the material injection (FIG. 9), or the material press-fitting (FIG. 10). . Since the resin injection hole 15 is located at the circumferential portion of the cylinder body 12, it is not enough to use only one O-ring 29, and it is necessary to use a plurality of O-rings 29. When moving to the resin injection hole 15 range, the other O-rings 29 located outside the resin injection hole 15 form a sliding seal between the plunger head 27 and the hole 13 of the transfer cylinder, so that air leakage and resin To prevent leakage.

FIG. 7 is a schematic cross-sectional view of the transfer mold 30 of the present invention, and shows a state in which the upper mold and the lower mold are separated. In the drawing, reference numeral 31 denotes an upper die, 32 denotes a lower die, 33 denotes a guide pin, 34 denotes a sleeve, 35 denotes a sprue runner, 36 denotes a spacer, 37 denotes a cushion pad, and 38 denotes a cavity.

FIG. 8 shows a state in which the upper mold and the lower mold are closed and the gate 16 is opened. After the gate 16 is opened, the material 40 which has been softened by heating at a high frequency is charged into the hole 13 of the transfer cylinder through the resin charging hole 15, and after the gate 16 is closed, the hole 13 is removed using a vacuum pump. The inside air S (FIG. 9) is sucked out and the holes 13 are set to the set vacuum degree (controlled by the vacuum controller). Further, the material 40 is pressed into the cavity 38 through the sprue runner 35 by the transfer plunger 24 (FIG. 10), and after pressing and curing, the mold is opened, and the product is knocked out and taken out. As the transfer plunger 24 descends to press the material in, the transfer cylinder bore 13 remains vacuum all the time, thus preventing air from being pressed into the cavity 38 with the material 40.

The embodiments described above do not limit the scope of the present invention, and any modification or alteration of details that can be made based on the present invention shall fall within the scope of the present invention.

It is sectional drawing of a well-known transfer molding machine, and shows the state which the upper mold and the lower mold separated. It is sectional drawing of the well-known transfer molding machine, and shows the state in which the material was thrown in the transfer cylinder. FIG. 3 is a cross-sectional view showing an operation subsequent to FIG. 2, showing a state in which a transfer plunger moves down and waits for press-fitting a material into a cavity. FIG. 3 is an exploded view of a transfer cylinder and transfer plunger combination device of the transfer molding machine according to the present invention. FIG. 3 is an axial sectional view of the present invention. It is AA sectional drawing of FIG. FIG. 2 is a cross-sectional view of the present invention attached to a transfer molding machine, showing a state when an upper mold and a lower mold are separated. FIG. 8 is a sectional view taken along the line BB of FIG. 7, showing a state in which the gate is opened after the mold is clamped and the material is put into the transfer cylinder. FIG. 9 is a structural operation display diagram of FIG. 8, showing a state in which a gate is closed and pressure reduction is started, in which an arrow indicates an air flow path. FIG. 10 is a cross-sectional view taken along the line CC of FIG. 9, showing a state where the transfer plunger descends to press the material into the plunger.

Explanation of reference numerals

Reference Signs List 10 Combination device of transfer cylinder and transfer plunger 11 Transfer cylinder 12 Cylinder body 13 Hole 14 Flat surface 15 Resin charging hole 16 Gate 17 Seal pad 18 First female screw 19 Second female screw 20 First pipe joint 21 Second Pipe joint 22 Gap 24 Transfer plunger 25 Plunger body 26 Thread 27 Plunger head 28 Annular groove 29 O-ring 30 Die 31 Upper die 32 Lower die 33 Guide pin 34 Sleeve 35 Sprulner 36 Spacer 37 Cushion pad 38 Cavity 40 Material 50 Gold Mold 51 upper mold 52 lower mold 53 transfer cylinder 54 transfer plunger 55 sprue runner 56 spacer 57 cushion pad 58 cavity

Claims (3)

In a combination device of a transfer cylinder and a transfer plunger of a transfer molding machine, a transfer cylinder and a transfer plunger are provided, the transfer cylinder includes a cylinder body, and a hole penetrating the cylinder body at two axial ends; A resin injection hole, an airtight gate joined to the cylinder body by a hinge and used to close the resin injection hole, and two female screws provided in the cylinder body and communicating with the hole, Connected to the vacuum pump and the vacuum controller by screw,
The transfer plunger includes a plunger body, a threaded portion is provided at one end of the plunger body, an outer diameter of an opposing end is enlarged to form a plunger head, and a plurality of O-rings are provided on the plunger head, and When the transfer plunger is at the upper limit of movement, some of the plunger heads are located in the holes of the transfer cylinder, and the plunger head is slidable in the transfer cylinder and at least one O-ring is provided between the plunger head and the transfer cylinder. Form a sealed state between the holes in the cylinder,
When the gate is opened, the lump of material after heating and softening is injected into the hole of the transfer cylinder from the resin injection hole, and after the gate is closed, the air in the hole is sucked out by the vacuum pump until the air reaches the set vacuum degree. A transfer cylinder and a transfer plunger of a transfer molding machine, wherein a material is press-fitted into a cavity of a mold by a transfer plunger. 2. The transfer cylinder and transfer plunger combination device according to claim 1, wherein the inner diameter of the hole of the transfer cylinder is larger than the outer diameter of the massive material, so that after the material is put into the hole, the transfer cylinder and the material are removed. Wherein a gap is generated between the transfer cylinder and the transfer plunger of the transfer molding machine. The transfer cylinder and transfer plunger combination device of a transfer molding machine according to claim 1 or 2, wherein a seal pad around the gate is provided, and a magnet coated on the seal pad is embedded, and the gate is tightly closed by magnetic force. A combination device for a transfer cylinder and a transfer plunger of a transfer molding machine, wherein the device is closed.

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