JP5140517B2 - Resin molding apparatus and resin molding method - Google Patents

Description

  The present invention relates to a resin molding apparatus and a resin molding method suitable for molding with a resin having a low viscosity such as a liquid resin.

In a resin molding apparatus that resin molds a semiconductor device or the like, an air vent mechanism for discharging air in the cavity is important in order to prevent the occurrence of voids and resin filling defects.
Normally, this air vent mechanism forms an air vent groove on the parting surface of the mold so that air in the cavity can be discharged to the outside through the air vent groove at the time of resin injection. However, in the case of a resin having a low viscosity such as a liquid resin, there is a problem that the resin leaks out from the air vent groove. Therefore, the depth of the air vent groove is adjusted to a very shallow depth of 5 μm to 3 μm by trial and error according to the type of resin, and a system that sucks and discharges air in the cavity with a suction device is also used. Attempts have been made to vent. However, when the depth of the air vent groove is set to a shallow one such as 5 μm to 3 μm, it takes a long time to suck and discharge the air by the suction device. There is a problem that cannot be prevented.

In this regard, Patent Document 1 discloses a device provided with an opening degree adjusting means for adjusting the opening degree of the air vent portion (groove). Specifically, a movable pin is provided in the air vent part so as to be movable up and down, and the opening degree of the air vent part (groove) is adjusted by the movable pin. The movable pin is driven by vertical movement means such as a hydraulic cylinder, electric servo means, solenoid and the like.
Japanese Patent Laid-Open No. 10-92853

According to the resin mold apparatus shown in Patent Document 1, the air vent part is greatly opened at the initial to middle stage of the resin injection operation to facilitate air discharge, and the opening of the air vent part is opened at the end of the resin injection operation. Since it is made to minimize, resin leakage can be eliminated.
However, in the one shown in Patent Document 1, the movable pin is driven and controlled in response to the injection state of the resin material, for example, the injection amount, the injection pressure, the operation position of the plunger, etc. However, there is a problem that the system design of the drive system is extremely troublesome and accurate control is difficult.

  Accordingly, an object of the present invention is to solve the above-described problems and to provide a resin molding apparatus and a resin molding method capable of easily and accurately adjusting the opening degree of the air vent portion with a relatively simple configuration.

  The resin mold apparatus according to the present invention includes a clamper that is bullet-loaded by a spring so as to be movable up and down on one of the upper and lower molds and protrudes on the surface of the one mold. When the mold is closed while pressing the clamper against the urging force, a cavity surrounded by the lower mold surface, the upper mold surface and the clamper is formed, and the resin supplied into the cavity is transferred by the upper and lower molds. In a resin molding apparatus that compresses and molds a workpiece set in a cavity, an air vent groove for releasing air in the cavity to the outside is provided on the clamper surface, and the clamper at a position where the air vent groove is located is moved up and down. The air vent groove is normally opened in the through hole that penetrates the air vent, and the air vent groove is closed when it moves up or down. When the upper and lower molds are closed, the clamper and the air vent pin move relative to each other so that the upper and lower molds are moved. When the mold is closed halfway, the air vent pin does not completely close the air vent groove, allowing air venting, and the air vent pin closes the air vent groove immediately before completion of mold closing of the upper and lower molds. It is characterized by preventing leakage from the air vent groove to the outside.

  In addition, the resin mold apparatus according to the present invention presses the resin supplied in the pot with a plunger, and feeds it into the cavity formed between the upper and lower molds through the cull part, the runner part, and the gate part, In a resin molding apparatus for resin-molding a workpiece set in a cavity, an air vent groove for escaping air in the cavity to the outside is provided on one of the upper and lower molds, and the air vent groove is positioned An air vent pin is provided in the through-hole penetrating up and down the one mold of the part to be moved, and is normally provided with an air vent pin that opens the air vent groove and closes the air vent groove when moved up or down. A closing spring is provided to bombard the air vent pin to the one mold, inserted into the through hole, and moved up and down together with the plunger. A push-up pin that pushes up the air vent pin when it moves or descends and closes the air vent groove by the air vent pin is provided, and the plunger moves up or down to feed the resin into the cavity, and through the air vent groove, inside the cavity When the plunger is raised or lowered to the required position, the air vent pin is pushed up by the push-up pin and the air vent groove is closed by the air vent pin to prevent the resin from leaking out from the air vent groove. It is characterized by doing.

  Further, the resin mold apparatus according to the present invention presses the resin supplied in the pot with a plunger and sends it into the cavity formed between the upper and lower molds through the cull part, the runner part, and the gate part, In a resin molding apparatus for resin-molding a workpiece set in a cavity, a wall of the cavity on the side facing the gate is provided on a movable wall that can move up and down, and one of the upper and lower molds Is vertically movably disposed in a through-hole penetrating up and down, and is connected to the movable wall, so that there is always a gap for air vent between the movable wall and the mold surface. An air vent pin that closes the gap when the movable wall comes into close contact with the mold surface when lowered is provided, and a closing spring that provides a bullet bed for the one mold is provided, A push-up pin that pushes up the movable wall through the air vent pin when it moves up and down with the plunger and moves up and down with the plunger, and the plunger rises and falls, Resin is fed into the cavity, air inside the cavity is discharged to the outside through a gap between the mold surface and the movable wall, and when the plunger is raised or lowered to a required position, the movable wall is moved by the push-up pin. And the gap is closed by the movable wall to prevent the resin from leaking outside the cavity.

  The resin molding apparatus according to the present invention further includes a clamper that is bombarded by a spring so as to move up and down in one of the upper and lower molds and protrudes from the mold surface of the one mold. When the mold is closed while pressing the clamper against the urging force of the spring, a lower mold surface, an upper mold surface and a cavity surrounded by the clamper are formed, and the resin supplied into the pot is planned. In the resin molding apparatus that presses with a jar and feeds it into the cavity formed between the upper and lower molds through the cull part, the runner part, and the gate part, and the resin mold for the workpiece set in the cavity, the clamper surface In addition, an air vent groove for escaping the air in the cavity to the outside is provided, and the air vent groove moves up and down in a through hole penetrating up and down the clamper at the portion where the air vent groove is located The air vent groove is normally opened, and the air vent groove is closed when the air vent groove is moved upward or downward, and a closing spring is provided for bulleting the air vent pin to the one mold. When the upper and lower molds are closed, the clamper and the air vent pin move relatively, and when the upper and lower molds are closed halfway, the air vent pin does not completely close the air vent groove, It is characterized in that air venting is possible, and the air vent pin closes the air vent groove immediately before completion of mold closing of the upper and lower molds, thereby preventing the resin from leaking out from the air vent groove.

The resin molding method according to the present invention is to resin mold using the above resin molding apparatus.
The resin mold apparatus according to the present invention includes an upper and lower mold having one mold and the other mold, and a cavity formed in the one mold and the other mold when the mold is closed. A resin molding apparatus that fills a resin and molds a workpiece, and is provided to face the one mold and is driven to approach the one mold and is supplied to the upper and lower molds. A drive unit that deforms the filled resin into the cavity of the upper and lower molds, and is formed on at least one of the molds on the parting surfaces of the one mold and the other mold, and the cavity and the outside An air vent groove that communicates with each other in a groove shape, and is arranged to be movable up and down in a sliding hole formed at a predetermined depth from the parting surface side of the other mold at a planar position where the air vent groove is located A movable member whose one end is directed to the air vent groove, and an elastic member provided between the other end of the movable member and the drive unit, and the elastic member is moved by the approaching operation of the drive unit. The movable member is brought close to the one mold side through a member, and the one end portion of the movable member is projected to the air vent groove side to close the air vent groove.

  According to the present invention, since the air vent part is greatly opened in the stage from the initial stage to the middle stage of the resin injection operation, the air is easily discharged, and the air vent part is closed at the end of the resin injection operation. Leakage can be eliminated. Further, since the air vent portion is opened and closed mechanically in conjunction with the opening / closing operation of the mold or the vertical movement operation of the plunger, the air vent can be accurately performed with a simple configuration.

Preferred embodiments of a resin mold apparatus according to the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a partial cross-sectional view showing an example of a compression molding type resin molding apparatus 10.
12 is an upper mold corresponding to “one mold” in the present invention, and 14 is a lower mold corresponding to “the other mold” in the present invention, which is opened and closed by a mold clamping mechanism (not shown).
The upper mold 12 has a mold member (block) of an upper mold base 16, a chase 17 and an insert 18. The chase 17 and the insert 18 are integrated with a bolt (not shown), and the upper mold base 16 is detachable.

  A work 20 such as a semiconductor device is sucked and held on the lower surface side of the insert 18. The suction holding device 21 has a suction path 22 opened on the lower surface of the insert 18, exerts a negative pressure suction force on the lower surface side of the insert 18, and the work 20 is sucked and held on the lower surface side of the insert 18 by this negative pressure suction force. Is done. The lower surface of the insert 18 is formed on a satin surface, and the peripheral part thereof is formed on a mirror surface, so that a suction force is applied to the matte surface and the work 20 is sucked and held. Reference numeral 23 denotes a guide pin for positioning the workpiece 20.

  The lower mold 14 includes a lower mold base 24, a chase 25, and an insert 26. The chase 25 and the insert 26 are integrated with a bolt 27 and assembled integrally with the lower mold base 24, and a mold base (not shown). It is detachable from the unit. In this embodiment, these mold members are provided so as to face the upper mold 12 and are driven so as to approach the upper mold 12, thereby deforming the supplied resin into the cavity. It functions as a “driving part” of the present invention to be filled. In this case, the coordinates (position in the vertical direction) of the drive unit correspond to the resin filling rate in the cavity. A clamper 30 surrounds the insert 26 and can be moved up and down, and is placed on the lower mold base 24 by a spring 31. Specifically, the spring 31 is elastically mounted between the head 32a of the bolt 32 fixed to the lower surface of the clamper 30 and the lower mold base 24, and the head 32a abuts on the lower surface of the chase 25, whereby the clamper The upper movement of the clamper 30 is regulated, and the lower surface of the clamper 30 is brought into contact with the upper surface of the chase 25 so that the lowering of the clamper 30 is regulated. Thereby, the clamper 30 can be moved up and down within the range of p in FIG.

  When the upper and lower molds 12 and 14 are closed while pressing the clamper 30 against the urging force of the spring 31, they are surrounded by the lower mold surface, the upper mold surface and the clamper 30 inside these members. A cavity 33 is formed. Then, the resin 34 supplied into the cavity 33 is compressed by the upper and lower molds 12 and 14, and the work 20 held on the lower surface of the insert 18 and set in the cavity 33 is resin-molded as described above. It has become. The resin 34 can be supplied with various resins such as a silicon resin, a polycide resin, an acrylic resin, or an epoxy resin in various forms such as a plate-shaped resin, a pulverized granular resin, or a liquid resin.

An air vent groove 35 is provided on the upper surface of the clamper 30 to allow the air in the cavity 33 to escape to the outside. The “outside” indicates not only the outside of the resin molding apparatus 10 but also the area outside the cavity 33. FIG. 2 is an explanatory view showing an arrangement example of air vent grooves and air vent pins. In the drawing, an arrangement example of the air vent groove 35 and the air vent pin 38 in the present embodiment is conceptually illustrated (FIG. 2A), and an arrangement example in a configuration example without a conventional air vent pin is also conceptually illustrated. (FIG. 2 (B)). In any of the arrangement examples shown in FIG. 2, six air vent grooves 35 are provided in the illustrated example, one at each of the four corners of the cavity 33 and two at the center. The depth of the air vent groove 35 is particularly preferably about 0.5 mm to 0.6 mm as an example so that the air in the cavity 33 can be easily evacuated by facilitating discharge of air inside the cavity 33. It is preferable to set within the range of 0.1 mm to 1.0 mm. However, the depth of the air vent groove 35 may be shallower or deeper than this range as long as the above-described conditions are satisfied.
Unlike the conventional configuration example shown in FIG. 2 (B), a through-hole 36 that vertically penetrates the clamper 30 is provided at a position where each air vent groove 35 of the present embodiment shown in FIG. 2 (A) is located. ing. An air vent pin (corresponding to a “movable member” in the present invention) 38 is provided in the through hole 36 such that one end thereof is directed to the air vent groove 35 (FIG. 1). In this case, the through hole 36 corresponds to a “sliding hole” in the present invention, and is formed at a predetermined depth from the upper surface (parting surface) side of the clamper 30 at a planar position where the air vent groove 35 is located. The air vent pin 38 may be provided at a position that blocks the air vent groove 35 as shown in FIG. 3 (A), and the air vent groove 35 in a state where the air vent pin 38 is drawn into the through hole 36 as shown in FIG. 3 (B). It is good also as a structure which comprises. The air vent pin 38 may have a circular cross section as shown in FIG. 3A or a rectangular shape as shown in FIG. 3B, and the shape is not particularly limited. In any case, when the air vent pin 38 moves upward and the upper end of the air vent pin 38 comes into contact with the lower surface of the workpiece 20 or the insert 18 via the peeling film 37 (FIG. 1), the air vent groove 35 is closed (closed). ), The air vent groove 35 is opened when lowered.

A flange 38a is provided at the lower end of the air vent pin 38 (corresponding to the "other end" in the present invention). An example of the "elastic member" in the present invention is between the lower surface of the flange 38a and the lower mold base 24. A certain closing spring 39 is elastically mounted, and a return spring 40 having a spring force weaker than that of the closing spring 39 is elastically mounted between the upper surface of the flange 38 a and the chase 25. The return spring 40 is provided for the purpose of returning the air vent pin 38 to the initial position when the mold is opened. The air vent pin 38 is stationary at a position where the force from the closing spring 39 and the force from the return spring 40 are balanced, and is always at a position where the air vent groove 35 is opened (normally). The term “always” refers to a period during which air venting is possible, and as an example, refers to a period excluding a temporary mold closing period from immediately before completion of mold closing of the upper and lower molds 12 and 14 to mold opening. .
As shown in the drawing, a coil spring is preferably used for each of the above-mentioned springs, but the present invention is not limited to this. The air vent pin 38 may be lowered by its own weight, and the return spring 40 is not necessarily provided. In this case, for example, a configuration in which only one spring is mounted like the bolt 32 can be adopted. In addition, although it is not easy to assemble the mold, the structure using the return spring 40 is not sufficient, but in the lower mold base 24, one end portion of the closing spring 39 is fixed to the upper surface in the spring accommodating space and the lower surface of the flange 38a. If the other end portion is fixed, the same effect as when the return spring 40 is installed can be obtained.

In the present embodiment, the resin 34 is compression-molded with the peeling film 37 disposed on the upper surface of the clamper 30 in and around the cavity 33.
Between the peeling film 37 and the bottom surface of the cavity 33, air is sucked by the suction device 42, so that compression molding is performed in a state where the peeling film 37 is in close contact with the bottom surface of the cavity 33. A circumferential groove 43 is formed on the upper surface of the clamper 30 outside the air vent groove 35, and the peeling film 37 is also in close contact with the bottom surface of the circumferential groove 43. Reference numeral 44 denotes a suction hole for exerting a negative pressure suction force in the circumferential groove 43.

The present embodiment is configured as described above.
The operation will be described below together with the molding method.
The resin 34 is a thermosetting resin, and the upper and lower molds 12 and 14 are heated by a heater (not shown).
First, in a state where the upper and lower molds 12 and 14 are opened, the work 20 is attracted to the upper mold 12 and a peeling film 37 is stretched on the lower mold 14 to supply the resin 34. Subsequently, for example, the lower mold 14 is moved up to bring the upper and lower molds 12 and 14 closer to each other, thereby bringing the upper surface of the clamper 30 into contact with the lower surface of the insert 18 via the peeling film 37 and closing the mold. Do. FIG. 1 shows an initial stage of mold closing of the upper and lower molds 12 and 14. That is, the upper and lower molds 12 and 14 are closed while resisting the urging force of the spring 31, and the upper surface of the clamper 30 is placed on the lower surface of the insert 18 (the lower surface of the work 20 in FIG. 1) via the peeling film 37. It is in a loosely abutted state. Thereby, the cavity 33 is formed, and compression (filling) of the resin 34 supplied into the cavity 33 is started. As a result, the air in the cavity 33 that is expelled to the outside as the resin 34 is filled is gradually discharged to the outside through the air vent groove 35. That is, at this stage, as shown in FIG. 1, the air vent groove 35 is hardly closed by the air vent pin 38.

The upper and lower molds 12, 14 are further clamped against the urging force of the spring 31, and the stage in the middle of mold clamping is shown in FIG. At this stage, since the drive unit in the present embodiment further approaches the upper mold 12, the clamper 30 moves relative to the other end of the air vent pin 38 (the air vent pin 38 is Motion), one end of the air vent pin 38 passes through the parting surface of the clamper 30 and approaches the upper mold 12 side. As a result, the air vent pin 38 is brought into a loose contact with the peeling film 37. The distance between the upper surface of the chase 25 and the lower surface of the clamper 30 is q. The air vent pin 38 is pushed by the lower mold base 24 via the closing spring 39 and is received by the return spring 40 and the closing spring 39 from above and below, so that the air vent pin 38 is elastically brought into contact with the peeling film 37. There is no such thing as breaking through the peeling film 37.
Even at this stage, since the air vent pin 38 is in loose contact with the workpiece 20 via the peeling film 37, the air in the cavity 33 flows between the air vent groove 35 or the peeling film 37 and the workpiece 20. It can be discharged to outside.

  FIG. 5 shows the stage at the end of mold clamping (immediately before completion of mold closing) in which the upper and lower molds 12 and 14 are clamped more strongly against the urging force of the spring 31. In this final stage, the clamper 30 moves in a direction relatively closer to the air vent pin 38, and the air vent pin 38 is in strong contact with the workpiece 20 via the peeling film 37 by the action of the closing spring 39. It becomes. The distance between the upper surface of the teeth 25 and the lower surface of the clamper 30 is r, which is a state that is considerably narrower than the distances p and q described above. As a result, one end of the air vent pin 38 protrudes from the air vent groove 35 side with a strong pressing force, so that the air vent groove 35 is completely closed (closed), and the clamper 30 also attaches the peeling film 37 to the lower surface of the workpiece 20. Therefore, the cavity 33 is completely sealed, and the compression molding pressure is in the cavity 33 and the resin 34 is thermoset in a compressed state, thereby completing the compression molding. In this way, the air vent groove 35 is gradually closed from the fully opened state by the air vent pin 38 (the degree of opening is reduced), and the pressing force by the air vent pin 38 gradually increases even after closing. Is possible. The air in the cavity 33 is almost completely discharged out of the cavity 33 at the stage of FIG. 4, so that no voids or unfilled portions of the resin 34 occur. Subsequently, when the mold is opened, the air vent pin 38 is released from the abutting state, so that the closing spring 39 and the return spring 40 are also restored to their original lengths (see FIG. 1). . In this case, since the air vent pin 38 is held using not only the closing spring 39 but also the return spring 40, the air vent pin 38 can be reliably returned to the original position. Further, since the flange 38a can be returned to the position set by the lengths and the urging forces of the springs 39, 40, the positions can be easily changed by making the lengths and the urging forces of the springs 39, 40 different. can do. For example, when it is desired to increase the initial position (return position) of the flange 38a in order to advance the closing timing of the air vent groove 35, the length of the closing spring 39 is increased, the urging force thereof is increased, What is necessary is just to shorten length or weaken the urging | biasing force. Similarly, when it is desired to delay the closing timing of the air vent groove 35, the length of the spring and the urging force may be set opposite to those in the above-described example. As described above, since the closing timing of the air vent groove 35 can be easily changed by simply changing the design of a general-purpose spring, it is easy to change specifications without changing the length of the air vent pin 38 or the shape of the mold. And it can respond easily.

  In the present embodiment, the six air vent grooves 35 and the air vent pins 38 are provided as described above. However, the two air vents on the central side are performed first, and the two air vent grooves on the central side are provided. Is preferably closed first, and then the four air vent grooves at the corners are closed. In this case, for example, the length of the central closing spring 39 can be increased and the length of the corner closing spring 39 can be shortened. By adopting such a configuration, when the resin 34 is supplied to the center of the cavity 33, the air is finally discharged from the corner of the cavity 33, which is preferable because the remaining air hardly occurs. Further, for example, by making the length of the closing spring 39 opposite to that in the above-described example at the center and corners, X is configured by two straight lines that connect the opposing corners of the rectangular cavity 33. The air vent can be suitably performed when the resin 34 is supplied in a letter shape. That is, it is preferable to employ a configuration in which the time until the resin 34 reaches and the time until the air vent groove 35 is closed are proportional.

As described above, in the present embodiment, the air vent pin 38 closes the air vent groove 35 mechanically interlocked with the mold closing of the upper and lower molds 12 and 14, so that the air in the cavity 33 can be reliably discharged. In particular, even if the resin 34 is a liquid resin, air venting is preferably performed as described above at the initial stage or in the middle of mold closing, and the cavity is completely sealed at the end of mold closing. It does not occur. Further, unlike the conventional resin molding apparatus, a single drive unit is provided by mechanically interlocking the mold closing of the upper and lower molds 12 and 14 and the closing of the air vent groove 35 by the air vent pin 38 without providing a dedicated driving means. Can be executed by.
Even if there is some resin leakage in the middle of mold closing, the resin 34 accumulates in the circumferential groove 43, so that the mold is not contaminated. In particular, as shown in FIG. 4, since the position inside the circumferential groove 43 is located inside the outer end of the workpiece 20, it is possible to prevent the resin from being transmitted to the end surface of the workpiece 20 and the mold surface by capillary action. Does not contaminate the mold.

In the above embodiment, the clamper 30 mechanism and the air vent pin 38 mechanism are provided on the lower mold 14 side, but these mechanisms may be provided on the upper mold 12 side.
Further, the peeling film 37 is not necessarily used.

FIG. 6 shows still another embodiment of the resin mold apparatus 10 of the compression molding type. The same members as those in the above embodiment are denoted by the same reference numerals, and description thereof is omitted.
In the present embodiment, for example, a structure used for wafer molding is provided, and a suction device 46 for sucking air in the cavity 33 is provided.
The suction device 46 forms a suction path 47 communicating with the inside of the circumferential groove 43 in the clamper 30 and a seal ring 72 around the circumferential groove 43, and sucks air in the cavity 33 through the suction path 47. By discharging, the inside of the cavity 33 is decompressed, and thereby the air vent effect can be further enhanced. As described above, since the air vent groove 35 is not closed at the initial stage and in the middle of mold closing, air can be vented through the air vent groove 35 having a sufficiently large depth (for example, 0.5 mm). In addition, the pressure can be effectively reduced. In addition, since the air vent groove 35 is completely closed at the end of mold closing, resin leakage can be prevented even if it is a liquid resin. In the case of the compression molding type as shown in this figure, the planar shape in the cavity 33 is preferably a polygon such as a rectangle for a substrate mold, and a circle is preferably used for a wafer mold or the like. In this case, in the case of a circular shape, for example, an air vent groove 35 is provided at every predetermined angle (for example, 30 °, 60 °, 90 °, 120 °, 180 °) obtained by dividing 360 ° by one or more natural numbers, and simultaneously closed. Can be adopted.

Next, FIG. 7 to FIG. 10 show an embodiment in the case of a transfer type resin molding apparatus 50.
The same members as those of the compression molding type resin mold apparatus 10 are denoted by the same reference numerals.
The basic structure of the transfer resin molding apparatus 50 is also known, and the resin 34 supplied into the pot 52 is pressed by the plunger 54 and passed through the cull part 55, the runner part 56, and the gate part 57. The work 20 set so as to face the cavity 33 is resin-molded into the cavity 33 formed between the upper and lower molds 12 and 14. As shown in FIG. 7, the plunger 54 in the present embodiment cures a thermosetting seal portion forming resin at the tip portion thereof, covers the resin pressing surface of the plunger head portion, and goes around the outer peripheral surface. It is preferable to form and use a cap-shaped seal portion. As a result, the sliding clearance can be eliminated, and when the pressure applied to the tip of the plunger 54 is high, the airtight sealing can be performed by Poisson deformation. As an example, the seal portion can be formed in the above-described shape by supplying a resin for forming a seal portion onto a plunger 54 that is kept waiting in the pot 52 and curing the resin in the pot 52. At this time, it is preferable that the distal end portion of the plunger 54 is formed with a small-diameter portion, an undercut or a concave portion in order to prevent the seal portion from falling off. Such a plunger 54 can effectively prevent resin leakage in the pot 52.

Unlike the compression molding type resin molding apparatus 10, the resin molding apparatus 50 does not have a clamper.
In the present embodiment, the cavity 33 is formed as a space surrounded by the recess formed in the lower mold 14 and the lower surface of the workpiece 20. A configuration in which a space configured by clamping the upper and lower molds 12 and 14 without the work 20 is provided as the cavity 33 and the work 20 is set in the cavity 33 (specifically, in the recess). Can also be adopted.
In the present embodiment, an air vent groove 35 for releasing the air in the cavity 33 to the outside is provided on the parting surface (mold surface) of the lower mold 14 surrounding the cavity 33. In this case, the air vent groove 35 is necessarily provided on the parting surface on the opposite side of the gate portion 57 with the cavity 33 interposed therebetween.
A through hole 36 that vertically passes through the lower mold 14 where the air vent groove 35 is located is provided, and an air vent pin 38 is disposed in the through hole 36 so as to be movable up and down.

When the air vent pin 38 moves upward and the upper end of the air vent pin 38 comes into contact with the lower surface of the work 20 (the insert 18 when the upper and lower molds 12 and 14 are clamped without the work 20 interposed), the air vent groove 35 is closed ( The air vent groove 35 is opened when it is lowered.
A large diameter portion 36a is formed in the middle of the through hole 36, and the head 60a of the mediating pin 60 is in contact with the upper surface of the step surface 36b on the lower side of the large diameter portion 36a.

  A flange 38a is provided at the lower end of the air vent pin 38, and a closing spring 39 is elastically mounted between the lower surface of the flange 38a and the head 60a of the mediating pin 60, and a step difference between the upper surface of the flange 38a and the upper side of the large diameter portion 36a. A return spring 40 having a spring force weaker than that of the closing spring 39 is mounted between the surface 36c. The air vent pin 38 is stationary at a position where the force from the closing spring 39 and the force from the return spring 40 are balanced, and is normally at a position where the air vent groove 35 is opened at this position. The return spring 40 is not necessarily provided.

Reference numeral 62 denotes a push-up pin, which is inserted into the lower part of the through hole 36 and, when moved upward, pushes up the air vent pin 38 via the intermediate pin 60 and the closing spring 39, and the air vent pin 38 thereby closes the air vent groove 35 ( Close). In this case, the lengths of the push-up pin 62 and the mediation pin 60 are set so that the lower end surface of the mediation pin 60 and the upper end surface of the push-up pin 62 are separated from each other before the upward movement (see FIG. 7). Has been. In other words, the lengths of both pins 60 and 62 are set such that the gap between both end faces (the gap between the pin end faces) has a predetermined distance before the upward movement.
The push-up pin 62 is fixed to the movable plate 63 that moves in the vertical direction, and moves up and down together with the movable plate 63. A plunger 54 is attached to the movable plate 63 via a spring multi-unit. The movable plate 63 is connected to a drive shaft 64 that functions as a transfer mechanism for driving the plunger 54 in the vertical direction and moves up and down. In the present embodiment, the mediation pin 60, the push-up pin 62, the movable plate 63, and the drive shaft 64 function as the “drive unit” in the present invention. In this case, the transfer coordinate (position in the vertical direction) of the drive unit is a space obtained by adding the spaces of the cull unit 55, the runner unit 56, the gate unit 57 and the cavity 33 formed between the upper and lower molds 12 and 14. It corresponds to the resin filling rate. In particular, the predetermined range on the transfer completion position side in the transfer coordinates of the drive unit corresponds to the resin filling rate in the cavity 33.
A control device for controlling the air suction of the suction device 46 is provided outside the figure. This control device outputs an air vent (vacuum) based on an output signal output from a transfer encoder (not shown) provided on the drive shaft 64 and indicating the drive amount of the drive shaft 64 in the vertical direction, and the time from the start of drive. Pull) control the operation.

The resin mold device 50 according to the present embodiment is configured as described above.
The operation will be described below together with the molding method.
The workpiece 20 is set in the cavity 33 in advance. The set of the workpieces 20 can be sucked and held on the lower surface of the insert 18 of the upper mold 12 as in the above embodiment.
After storing the tablet-like resin 34 (resin tablet) in the pot 52, the upper and lower molds 12, 14 are closed (FIG. 7).

Next, the plunger 54 is moved upward via the spring multi-unit by the drive shaft 63, and injection of the resin 34 melted in the pot 52 into the cavity 33 is started. On the other hand, the suction of the air by the suction device 46 is started under the control of the control device. In a state where air is sucked, the melted resin 34 is injected into the cavity 33 from the cull portion 55, the runner portion 56, and the gate portion 57.
The air in the cavity 33 is discharged to the outside through the air vent groove 35. At this time, the control device performs switching control to temporarily stop or weaken the air suction immediately before the flow front of the resin 34 reaches the gate portion 57 based on the driving amount of the drive shaft 64 in the vertical direction. I do. This switching can prevent jetting. Subsequently, when the resin 34 starts to be injected into the cavity 33 and is filled to about 20% to 30% of the volume of the cavity 33, the control device resumes air suction.
FIG. 8 shows an initial stage of resin injection, and FIG. 9 shows a stage in the middle of resin injection. In any of these stages, the air vent groove 35 is in an open state, and air can be discharged well. In this case, although the upper end surface of the push-up pin 62 has risen considerably, the clearance between the pin end surfaces still remains, so that the air vent pin 38 has not started to close the air vent groove 35.

When the upper end of the push-up pin 62 comes into contact with the lower end of the mediation pin 62 and the clearance between the pin end faces disappears when the plunger 54 is raised to a position in the middle of resin injection, the push-up pin 62 causes the mediation pin 60 and the closing spring 39 to move. Then, the air vent pin 38 is raised, and the air vent pin 38 starts to close the air vent groove 35. Thus, by providing the clearance between the pin end faces, the air vent pin 38 is switched when the air vent pin 38 does not need to be operated and is operated when the need arises. The operation of 38 can be delayed. In other words, it is possible to start the upward movement of the air vent pin 38 later than the plunger 54. Subsequently, the air vent groove 35 is closed (closed) by the air vent pin 38 when the plunger 54 is raised to a required position immediately before the completion of resin injection. This predetermined position is preferably a position when the resin 34 is pumped until the resin 34 reaches just before the air vent groove 35. For example, the length of the air vent pin 38 and each of the springs 39 and 40 are adjusted by the above-described method so that the predetermined position is a position when the resin 34 is filled to about 80% to 90% of the volume of the cavity 33. The specification should be determined. Further, in the case of the transfer type, the closing timing of the air vent groove 35 can be adjusted more easily by adjusting the lengths of the intermediate pin 60 and the push-up pin 62 in addition to these.
Subsequently, when the flow front of the resin 34 reaches the air vent groove 35 by raising the plunger 54 from the position, the air vent groove 35 is completely closed by the air vent pin 38 (FIG. 10). Next, when the plunger 54 is raised to the position where the resin injection is completed, the resin 34 is thermally cured. At this time, since the air vent pin 38 is pressed against the intermediate pin 60 via the closing spring 39, the lift of the drive unit including the intermediate pin 60 is absorbed by the closing spring 39, and the air vent pin 38 presses against the workpiece 20. Only the pressure will rise. In this case, since the intermediate pin 60 and the push-up pin 62 are also raised, the air vent pin 38 pushed through the closing spring 39 is applied to the workpiece 20 with a stronger pressing force than immediately before completion of resin injection. It will be contacted (pressed).
For example, when a release film is stretched on the insert 26 constituting the cavity 33 (particularly from the cavity recess to the air vent groove 35 and its periphery) and resin molding is performed, a predetermined depth within a range not exceeding the thickness is provided. As a result, the air vent pin 38 is strongly brought into contact with the peeling film. As described above, also in this embodiment, the air vent groove 35 is gradually closed (squeezed) from the fully opened state by the air vent pin 38, and the pressing force by the air vent pin 38 gradually increases after closing. Closing is possible.
Thereby, a required resin pressure is generated in the cavity 33, and the resin molding of the workpiece 20 is performed. The control device continues the air suction after the resin 34 is filled, and stops after the gel time of the resin 34 has elapsed. Subsequently, compression molding is completed by applying a required resin pressure to the resin 34 and thermosetting it for a predetermined time.

Since the air vent pin 38 is pushed through the closing spring 39 and comes into contact with the work 20, the air vent pin 38 comes into soft contact with the work 20 and does not damage the work 20.
Since the air vent groove 35 is opened until just before the resin injection is completed, even if the depth of the air vent groove 35 is shallow, the air in the cavity 33 is suitably discharged. Since the air vent groove 35 is closed by the air vent pin 38 immediately before the resin injection is completed, no resin leakage occurs even in the case of a liquid resin. Further, if the resin pressure of the resin 34 in the cavity 33 rises due to the rise of the plunger 54, the air vent pin 38 can be brought into contact with the work 20 with a strong pressing force in conjunction with this, and the resin leakage is ensured. Can be prevented.

As described above, also in the present embodiment, the air vent pin 38 closes the air vent groove 35 mechanically interlocked with the rise of the plunger 54, so that the air in the cavity 33 can be reliably discharged. In particular, even if the resin 34 is a liquid resin, air venting is preferably performed as described above at the initial stage or in the middle of mold closing, and the cavity is completely sealed at the end of mold closing. It does not occur.
Moreover, since the position inside the circumferential groove 43 is located inside the outer end of the workpiece 20, it is possible to prevent the resin from being transmitted to the end surface of the workpiece 20 and the mold surface due to capillary action, so that the mold is contaminated. There is nothing to do.
In the above embodiment, the plunger mechanism and the air vent pin 38 mechanism are provided on the lower mold 14 side. However, these mechanisms may be provided on the upper mold 12 side.

FIG. 11 shows another embodiment of the transfer type resin molding apparatus 50.
The same members as those in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.
In the present embodiment, it is a triple plunger (multi-plunger) type resin molding apparatus having three pots 52 and plungers 54 for one cavity 33. In this way, it is possible to adopt a configuration in which the resin 34 pumped by the plurality of plungers 54 moved up and down using the spring multi-unit is injected into the cavity 33 from the plurality of gate portions 57. And the cavity wall part 33a which comprises the whole wall surface of the side (opposite side to a gate part) facing the gate part 57 is provided so that a vertical movement is possible. This cavity wall portion (movable wall) 33a is connected to an air vent pin 38 driven by a drive mechanism equivalent to the configuration of the previous embodiment, so that the cavity wall portion 33a can be moved up and down. In this case, the air vent pin and the cavity wall 33a correspond to the “movable member” in the present invention.

In the present embodiment, when the plunger 54 is raised, at the initial stage of resin injection and in the middle, the air vent gap is set between the upper end of the cavity wall 33a and the mold surface of the upper mold 12. The air vent is made.
Then, when the plunger 54 is raised to the required position immediately before the completion of the resin injection, the air vent pin 38 is raised by the push-up pin 62 in the same manner as in the above embodiment, whereby the cavity wall portion 33a is placed on the upper mold surface. The cavity 33 is hermetically sealed to complete the resin injection.
In this embodiment, air venting can be performed well.
In the present embodiment also, a suction device (not shown) for sucking the air in the cavity 33 may be provided.

12 and 13 show still another embodiment of the transfer type resin molding apparatus 50. FIG.
The same members as those in the above embodiment are denoted by the same reference numerals, and description thereof is omitted.
In the present embodiment, as shown in FIG. 13, two rows and three cavities 33 a and 33 b are formed as a configuration in which the runner portion 56 branches from the main runner connecting the cull portion 55 to the sub runner. 33c.
Since the cavity 33 closer to the plunger 54 (the cull portion 55) starts filling earlier due to the shorter distance of the runner portion (especially the main runner) 56 through which the resin 34 passes until reaching the cavity 54, The resin injection is sequentially completed from the cavity 33 on the side closer to the plunger 54. Therefore, the length of the push-up pin 62 in the cavity 33 closer to the plunger 54 is increased so that each air vent groove is closed by the air vent pin 38 in the order of the cavity 33a → the cavity 33b → the cavity 33c ( FIG. 12). Since the plurality of push-up pins 62 are erected on the single movable plate 63 in the above-described order, the plurality of air vent pins 38 with different closing timings of the air vent grooves 35 are operated by one drive mechanism. Will be able to.
In the present embodiment, the operations of the air vent pins 38 are almost the same as those shown in FIGS. 7 to 10 except that the closing timings of the air vent grooves 35 are different. For example, when the drive shaft is operated to fill the cull portion 55 with the resin 34 (FIG. 13 (A)), and the resin 34 is further pumped, the air vent groove of the cavity 33a as shown in FIG. 13 (B). The resin 34 reaches just before 35, and the cavities 33b and 33c are filled with the resin 34. At this time, the air vent groove 35 is closed by the air vent pin 38 provided in the cavity 33a. At this time, the air vent grooves 35 of the cavities 33b and 33c are opened. Subsequently, when the resin 34 is further pumped, the resin 34 reaches just before the air vent groove 35 of the cavity 33b as shown in FIG. At this time, the air vent groove 35 is closed by the air vent pin 38 provided in the cavity 33a. At this time, the air vent groove 35 of the cavity 33c is opened. Subsequently, when the resin 34 is further pumped, as shown in FIG. 13D, the resin 34 reaches just before the air vent groove 35 of the cavity 33c, and the air vent groove 35 is closed by the air vent pin 38 provided in the cavity 33a. Is done. At this time, all the air vent grooves 35 of all the cavities 33a to 33c are closed.
Thus, by using together the drive mechanism which operates the several air vent pin 38, the several air vent pin 38 closing timing can be varied, without providing a complicated closing mechanism. Further, since the length of the push-up pin 62 can be adjusted, the length can be easily adjusted. For example, the push-up pin 62 having the same length as the push-up pin 62 for the cavity 33a closest to the plunger 54 can be used. By using the cavities 33b and 33c and adjusting the length protruding above the movable plate 63, the same effects as the above-described configuration can be obtained. It should be noted that the length of the mediation pin 60 may be changed in place of the push-up pin 62, and a configuration is adopted in which the length of the push-up pin 62 is adjustable after the length of the mediation pin 60 is varied. You can also. Furthermore, a technique for changing the closing timing in the compression molding method can also be applied to this embodiment.

FIG. 14 shows a resin molding apparatus 70 according to still another embodiment.
The resin mold device 70 is of a compression molding type and a transfer type combined type, and is used for, for example, a resin mold of an LED package. Components that are basically the same as those of the above-described embodiments are given the same reference numerals, and descriptions thereof are omitted.
Since the resin mold device 70 has a plurality of recesses formed in the insert 26, a plurality of hemispherical lenses of the LED package can be formed in a lump. An LED chip is mounted on the workpiece 20 to be resin-molded so as to correspond to the position where the recess is formed (not shown). Further, the resin molding apparatus 70 includes a clamper 30 that is bullet-loaded by a spring 31 so as to move up and down on the lower mold 14 and protrudes onto the surface of the lower mold 14. When the upper and lower molds 12 and 14 are closed while pressing the clamper 30 against the urging force of the spring 31, a cavity 33 surrounded by the lower mold surface, the upper mold surface and the clamper 30 is formed. Then, the resin 34 supplied into the pot is pressed by the plunger 54 and sent into the cavity 33 through the cull part 55, the runner part 56, and the gate part 57, and the workpiece 20 set in the cavity 33 is resin-molded. It is like that. In this embodiment, a peeling film 37 capable of covering all the portions in contact with the resin 34 in the lower mold 14 provided with the pot is stretched, and a large-diameter pot is used. Thereby, the liquid resin 34 can be supplied onto the peeling film 37 bent so as to be recessed along the large-diameter pot. More liquid resin 34 can be supplied. In this case, wrinkles or the like do not occur in the peeling film 37 because a large-diameter pot is used. Further, a peeling film 37 covering the cull part 55 and the gate part 57 is stretched on the parting surface of the upper mold 12.

  An air vent groove (not shown in FIG. 14) for releasing the air in the cavity 33 to the outside is provided on the upper surface of the clamper 30. The air vent groove moves up and down through a through hole penetrating the clamper 30 at a position where the air vent groove is located. An air vent pin 38 that is disposed freely and normally opens the air vent groove and closes the air vent groove when moved upward is provided, and a closing spring 39 and a return spring 40 for bullet-loading the air vent pin 38 to the lower mold 14 are provided. Is provided.

When the upper and lower molds 12 and 14 are closed, first, the seal ring 72 is compressed by the upper and lower inserts 18 and 26 by performing a mold closing operation in the same manner as the compression molding type resin molding apparatus. At the same time, the clamper 30 is brought into contact with the workpiece 20. In this embodiment, the mold member approaching the upper mold 12 at this time corresponds to the “drive unit” in the present invention. Next, the resin 34 is injected into the cavity 33 by moving the plunger 54 upward as in the transfer type resin molding apparatus. At this time, when the clamper 30 and the air vent pin 38 move relative to each other and the upper and lower molds 12 and 14 are closed halfway, the air vent pin 38 does not completely close the air vent groove. Is possible. Also in the present embodiment, the operation state of the air suction by the suction device 46 is switched at each time point when the resin 34 is filled to the predetermined ratio as described above.
Next, when the plunger 54 is raised to the required position immediately before the completion of the resin injection, the upper and lower molds 12 and 14 are moved closer to each other so that the gap between the workpiece 20 and the insert 26 is sealed in the LED package. The lower mold 14 is moved up to a position thicker than the thickness of the stop portion (initial sealing thickness), and the air vent groove 35 is closed by the air vent pin 38. As a result, the air vent pin 38 closes the air vent groove and prevents the resin from leaking outside from the air vent groove. Subsequently, the lower mold 14 is moved upward so that the upper and lower molds 12 and 14 are kept close to each other so that the gap between the workpiece 20 and the insert 26 (interval between the cavities 33) becomes a desired sealing thickness. In this case, the insert 26 is moved upward, but the air vent pin 38 pushed through the closing spring 39 does not move up and is applied to the workpiece 20 with a stronger pressing force than immediately before the resin injection is completed. It will be contacted (pressed). On the other hand, the resin 34 pushed back from the cavity 33 is accommodated in a pot internal space formed by the plunger 54 moving downward. In this case, the holding pressure for applying a high resin pressure in advance by increasing the resin pressure by stopping the downward movement of the plunger 54 before reaching the desired sealing thickness is executed. In addition, a holding pressure (second holding pressure) in which a high resin pressure is applied by moving the plunger 54 upward after execution of the main holding pressure may be executed. Note that pressure holding may not be performed, and in this case, the plunger 54 can be controlled to move downward without being stopped. Subsequently, the workpiece 20 is resin-molded by holding in this state and thermosetting the resin 34.
Thus, at the time of resin injection, the transfer type is such that the resin is injected into the cavity 33 by the plunger 54, and the air vent pin 38 closes the air vent groove immediately before the upper and lower molds 12, 14 are closed. Since the resin pressure acts in the cavity 33 and the resin is slightly pushed back to the plunger 54 side via the gate portion 57 or is held in pressure, compression molding is performed at this stage.
Also in the resin mold apparatus 70 according to the present embodiment, the resin leakage can be prevented by the simple mechanical configuration as described above. In the case where it is necessary to increase the resin pressure in order to hold the resin back to the plunger 54 side as in this embodiment, the pressing force by the air vent pin 38 can be increased in proportion to the resin pressure. Therefore, it can be closed with an appropriate pressing force. That is, since the workpiece 20 is not pressed with an unnecessarily strong pressing force from the beginning, the resin leakage can be effectively prevented while suppressing the stress applied to the workpiece 20 as much as possible.
Also in this embodiment, the plunger mechanism and the clamper mechanism may be arranged on the upper mold side.

  Moreover, it is also possible to perform resin molding by compression molding using the resin molding apparatus 70 according to the present embodiment. In this case, the resin 34 is supplied to the cavity 33, and the resin 34 is filled into the cavity 33 in the same manner as the compression molding type resin molding method described above. Subsequently, in the same manner as described above, it is possible to adopt a configuration in which the surplus resin 34 is pumped to the plunger 54. In addition, the structure which provides an overflow cavity separately is also employable.

  In addition, the air vent groove 35 is configured to allow air venting between the cavity 33 (in other words, a cavity concave portion formed in a mold for forming the cavity 33) and the outside in a groove shape (band shape). If there is, it is not limited to the configuration described above. For example, various configurations formed on one or both of the parting surfaces of the upper mold 12 and the lower mold 14 can be employed. In the configuration in which the workpiece 20 is set in the cavity 33 without being clamped by the upper and lower molds 12 and 14 as shown in FIG. 6, the lower mold 14 provided with the air vent pin 38 is not provided with the air vent groove 35. A configuration in which the air vent groove 35 is provided at a planar position where the air vent pin 38 is located on the parting surface of the upper mold 12 may be employed. In other words, it is possible to employ a configuration in which the air vent groove 35 and the air vent pin 38 are provided so as to overlap in the vertical direction.

  In this case, the shape of one end of the air vent pin 38 is preferably a shape that can enter and close the air vent groove 35, and for example, a shape that can be fitted into the air vent groove 35 can be adopted. Further, it is possible to adopt a configuration in which a recess having a size capable of inserting one end of the air vent pin 38 is provided on the air vent groove 35. For example, in the case where a circular air vent pin 38 larger than the width of the air vent groove 35 is used, a circular concave portion large enough to allow the air vent pin 38 to be inserted can be provided on the air vent groove 35.

In the above-described embodiment, the configuration in which the coil spring is used as the closing spring 39 for moving the air vent pin 38 up and down has been described. However, the present invention is not limited to this, and the elastic member according to the present invention includes various types such as a leaf spring and a bamboo spring. In addition to the spring, various elastic bodies that can absorb the operation of the drive unit as needed can be used. For example, an air spring can be used as the elastic member.
Moreover, although the structure which moves the air vent pin 38 up and down via the closing spring 39 by the approaching operation of the drive unit by pressing the closing spring 39 has been described, the present invention is not limited to this. For example, another configuration can be adopted in the compression molding type shown in FIG. 1 or the transfer type combined type shown in FIG. Specifically, it is possible to employ a configuration in which a closing spring is provided at the position of the return spring 40 without providing a spring at the position of the closing spring 39 in the above-described embodiment. In this case, in the chase 25, one end of the closing spring is fixed to the lower surface of the spring accommodating space and the other end is fixed to the upper surface of the flange 38a, and the upper and lower molds 12 and 14 are closed and further clamped. The air vent pin 38 can be elastically brought into contact with the peeling film 37 by sometimes pulling the closing spring. According to such a configuration, the operation of the drive unit after the air vent groove 35 is closed can be absorbed by the closing spring, and the same effects as the above-described configuration can be achieved.

  Moreover, although the air vent pin 38 closed the air vent groove 35 completely and the resin 34 was prevented from leaking outside from the air vent groove 35 in the above-described embodiment, the present invention is not limited to this. That is, it is also possible to employ a configuration in which the resin 34 is finally closed to the extent that it can be prevented from leaking from the air vent groove 35 to the outside. For example, when a resin mold of the resin 34 having a high viscosity is performed, it may be in a state where only a minute predetermined interval is opened by closing (closing) until a predetermined interval. The predetermined interval can be set as appropriate depending on the sealing conditions (resin type, mold temperature, etc.). As an example, when an epoxy resin containing a general filler is used, it is set to 10 μm, or about 5 μm to 20 μm. Or can be set to

  Moreover, although the above-mentioned embodiment demonstrated the structure which transmits the driving force of the drive shaft 64 to the air vent pin 38 using the intermediary pin 60 and the push-up pin 62 for the convenience of assembly and adjustment, this invention is not limited to this. For example, a configuration is adopted in which the push-up pin 62 is omitted from the configuration of the above-described embodiment, the mediation pin 60 is extended to the extent that it protrudes from the lower surface of the lower mold 14, and the mediation pin 60 is pushed directly by the movable plate 63. May be. Further, the intermediate pin 60 is omitted and the length of the push-up pin 62 is extended so as to be able to contact the lower surface of the closing spring 39 at the start of closing by the air vent pin 38, and the closing spring 39 is directly pressed against the push-up pin 62. Such a configuration may be adopted. Thus, any configuration may be used as long as the driving force of the drive shaft 64 can be transmitted to the air vent pin 38 via at least the closing spring 39.

It is a fragmentary sectional view of a compression molding type resin mold device. It is explanatory drawing which shows the example of arrangement | positioning of an air vent groove and an air vent pin. It is explanatory drawing which shows the example of the shape of an air vent groove and an air vent pin. It is a fragmentary sectional view of the mold clamping middle part in the resin mold device of FIG. It is a fragmentary sectional view just before completion | finish of the mold clamping in the resin mold apparatus of FIG. It is sectional drawing which shows other embodiment of the compression molding type resin mold apparatus. It is a partial abandon figure which shows an example of a transfer type resin mold apparatus. It is sectional drawing in the state of the resin injection initial stage of the resin mold apparatus of FIG. It is sectional drawing in the state in the middle of the resin injection | pouring of the resin mold apparatus of FIG. It is sectional drawing in the state of the resin injection completion of the resin mold apparatus of FIG. It is explanatory drawing which shows other embodiment of the transfer type resin mold apparatus. It is a partial explanatory view showing still another embodiment of a transfer type resin molding apparatus. It is explanatory drawing which shows the state formed in the cavity of every 2 rows 3 pieces. It is sectional drawing of the resin molding apparatus of a compression molding type and a transfer type combined type.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Resin mold apparatus 12 Upper mold 14 Lower mold 20 Work 30 Clamper 31 Spring 33 Cavity 34 Resin 35 Air vent groove 36 Through-hole 37 Peeling film 38 Air vent pin 39 Closing spring 40 Return spring 50 Resin mold apparatus 54 Plunger 55 Cal Part 56 runner part 57 gate part 60 intermediate pin 62 push-up pin 64 drive shaft 70 resin molding device

Claims (14)

One of the upper and lower molds has a clamper that is bombarded by a spring so as to move up and down and protrudes onto the mold surface, and the upper and lower molds resist the urging force of the spring. When the mold is closed while pressing, a cavity surrounded by the lower mold surface, the upper mold surface and the clamper is formed, and the resin supplied into the cavity is compressed by the upper and lower molds and set in the cavity. In resin molding equipment for resin molding
The clamper surface is provided with an air vent groove for escaping air inside the cavity to the outside,
An air vent pin is provided that is vertically movable in a through hole that vertically penetrates the clamper at a position where the air vent groove is located, and that normally opens the air vent groove and closes the air vent groove when moved up or down.
A closing spring is provided for bullet-loading the air vent pin to the one mold,
When the upper and lower molds are closed, the clamper and the air vent pin move relatively, and when the upper and lower molds are closed halfway, the air vent pin does not completely close the air vent groove, A resin molding apparatus characterized in that air venting is possible, and the air vent pin closes the air vent groove immediately before completion of mold closing of the upper and lower molds to prevent the resin from leaking out of the air vent groove.   The resin mold apparatus according to claim 1, further comprising a return spring that urges the air vent pin in an opening direction of the air vent pin.   The resin molding apparatus according to claim 1, further comprising a suction device that sucks air in the cavity. Using the resin mold device according to any one of claims 1 to 3,
The resin supplied in the cavity is compressed while closing the upper and lower molds, and the air in the cavity is discharged to the outside from the air vent groove, and the air vent groove is closed by the air vent pin immediately before the upper and lower molds are closed. A resin molding method characterized in that compression molding is performed while preventing resin leakage from the air vent groove. The resin supplied in the pot is pressed with a plunger and sent into the cavity formed between the upper and lower molds through the cull part, the runner part, and the gate part, and the work set in the cavity is resin molded. In resin molding equipment,
An air vent groove for escaping air in the cavity to the outside is provided on the surface of one of the upper and lower molds,
An air vent pin that is vertically movable in a through-hole penetrating up and down the one mold at the position where the air vent groove is located, and that normally opens the air vent groove and closes the air vent groove when moved up or down Is provided,
A closing spring is provided for bullet-loading the air vent pin to the one mold,
A push-up pin that is inserted into the through-hole, moves up and down together with the plunger, pushes up the air vent pin when it moves up or down, and closes the air vent groove with the air vent pin, is provided,
When the plunger is raised or lowered, the resin is fed into the cavity, the air in the cavity is discharged to the outside through the air vent groove, and when the plunger is raised or lowered to a required position, the push pin pushes the air vent. A resin molding apparatus characterized by pushing up a pin and closing the air vent groove with an air vent pin to prevent the resin from leaking out of the air vent groove.   6. The resin mold apparatus according to claim 5, further comprising a return spring that urges the air vent pin in an opening direction of the air vent groove.   The resin molding apparatus according to claim 5, further comprising a suction device that sucks air in the cavity. Using the resin mold device according to any one of claims 5 to 7,
The plunger is raised or lowered to feed resin into the cavity, and the air in the cavity is discharged to the outside through the air vent groove. When the plunger is raised or lowered to a required position, the push-up pin causes the air vent to A resin molding method, wherein a pin is pushed up and an air vent groove is closed by an air vent pin to prevent resin from leaking outside from the air vent groove. The resin supplied in the pot is pressed with a plunger and sent into the cavity formed between the upper and lower molds through the cull part, the runner part, and the gate part, and the work set in the cavity is resin molded. In resin molding equipment,
The wall of the cavity facing the gate is provided on a movable wall that can move up and down,
One of the upper and lower molds is vertically movable in a through-hole penetrating up and down, and is connected to the movable wall, and is usually used for air vent between the movable wall and the mold surface. An air vent pin is provided that closes the gap when the movable wall is in close contact with the mold surface when moved up or down.
A closing spring is provided for bullet-loading the air vent pin to the one mold,
A push-up pin that is inserted into the through hole, moves up and down together with the plunger, and pushes up the movable wall via the air vent pin when moved up or down is provided,
The plunger ascends or descends, feeds resin into the cavity, discharges air in the cavity to the outside through the gap between the mold surface and the movable wall, and the plunger ascends or descends to the required position. In this case, the movable wall is pushed up by the push-up pin, and the gap is closed by the movable wall to prevent the resin from leaking outside the cavity. One of the upper and lower molds has a clamper that is bombarded by a spring so as to move up and down and protrudes onto the mold surface of the one mold, and the upper and lower molds resist the urging force of the spring. When the mold is closed while pressing the clamper, a cavity surrounded by the lower mold surface, the upper mold surface, and the clamper is formed, and the resin supplied in the pot is pressed by the plunger, so that the cull part, the runner In the resin molding apparatus for sending the workpiece set in the cavity through resin, through the part and gate part, into the cavity formed between the upper and lower molds,
The clamper surface is provided with an air vent groove for escaping air inside the cavity to the outside,
An air vent pin is provided that is vertically movable in a through hole that vertically penetrates the clamper at a position where the air vent groove is located, and that normally opens the air vent groove and closes the air vent groove when moved up or down.
A closing spring is provided for bullet-loading the air vent pin to the one mold,
When the upper and lower molds are closed, the clamper and the air vent pin move relatively, and when the upper and lower molds are closed halfway, the air vent pin does not completely close the air vent groove, A resin molding apparatus characterized in that air venting is possible, and the air vent pin closes the air vent groove immediately before completion of mold closing of the upper and lower molds to prevent the resin from leaking out of the air vent groove.   11. The resin mold apparatus according to claim 10, further comprising a return spring that urges the air vent pin in an opening direction of the air vent groove.   The resin molding apparatus according to claim 10, further comprising a suction device that sucks air in the cavity. Using the resin mold device according to any one of claims 10 to 12,
The plunger is moved up or down to inject resin into the cavity through the cull part, runner part, gate part, and compress the resin supplied into the cavity while closing the upper and lower molds, Air in the cavity is discharged from the air vent groove to the outside, and the air vent groove is closed by the air vent pin immediately before the upper and lower molds are closed to prevent resin leakage from the air vent groove. Resin mold method. An upper and lower mold having one mold and the other mold is provided, and a resin is molded into a cavity by filling a cavity formed in the one mold and the other mold with the mold closed. A resin molding device,
Drive that is provided opposite to the one mold and is driven so as to approach the one mold to deform the resin supplied to the upper and lower molds and fill the cavity of the upper and lower molds And
An air vent groove formed in at least one of the molds on the parting surface of the one mold and the other mold and communicating in a groove shape between the cavity and the outside;
A movable portion having one end portion directed toward the air vent groove, which is disposed in a sliding hole formed at a predetermined depth from the parting surface side of the other mold at a planar position where the air vent groove is located. Members,
An elastic member provided between the other end side of the movable member and the drive unit;
Closing the air vent groove by causing the movable member to approach the one mold side via the elastic member by the approaching operation of the drive unit, and projecting the one end of the movable member to the air vent groove side; A resin molding device.

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