JPH07308933A - Transfer molding device - Google Patents

Abstract

PURPOSE:To provide a transfer molding device which is capable of holding scrap within the device and is capable of reducing exchange frequency of scrap boxes. CONSTITUTION:A resin sealing part 10 resin-seals a work 12. A scrap removal part 20 removes scrap such as a runner of a molded product stuck to the resin- sealed work 12 from the work 12. A scrap holding part 44 is provided on the lower part of the scrap removal part 20 and holds the scrap which is removed from the work 12 and fell in the holding part 44. A scrap processing part pulverizes the scrap falling into a space between the scrap removal part 20 and scrap holding part 44.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer molding apparatus, and more particularly, to a resin sealing portion for resin-sealing a work, and a scrap such as a molded product runner attached to the resin-sealed work. The present invention relates to a transfer mold apparatus including a scrap removing unit for removing a scrap from a work, and a scrap housing unit provided below the scrap removing unit for housing a scrap removed from the work and falling.

[0002]

2. Description of the Related Art In a transfer molding apparatus for resin-sealing a semiconductor device, a molded product which is formed during resin-sealing work after resin-sealing a lead frame, which is a work, but is completely unnecessary in a post process Scrap such as runner, molded product gate, molded product cull must be removed. Therefore, a transfer molding apparatus of recent years, particularly called an automolding apparatus, which automatically performs resin sealing work and scrap removal work, includes a resin sealing portion for resin-sealing a lead frame, A scrap removal section for removing scraps adhering to the resin-sealed lead frame that is juxtaposed in parallel with the resin sealing section from the lead frame, and is provided below the scrap removal section, removed from the lead frame, and dropped. A scrap storage section is provided which is composed of a scrap box for storing the incoming scrap.

[0003]

However, the above-mentioned conventional transfer mold apparatus has the following problems. In the conventional transfer molding apparatus, in order to improve the working efficiency, in the case of an apparatus that performs so-called hoop molding, in which a strip-shaped lead frame is continuously resin-sealed, the scrap size becomes long. In this case, if the scrap removed by the scrap removing device is stored in the scrap box as it is, that is, if it is stored in the scrap box in a rib shape, the scrap box becomes bulky and the scrap box becomes full in a short time, so that the scrap box must be frequently replaced. There is. Therefore, a method has been proposed in which the scraps removed are carried out of the transfer molding apparatus by a belt conveyor, but there is a problem in that the apparatus becomes large. Therefore, it is an object of the present invention to provide a transfer mold device that can store scrap in the device and can reduce the frequency of exchanging scrap boxes and the like.

[0004]

In order to solve the above problems, the present invention has the following constitution. That is, a resin sealing portion for resin-sealing a work, a scrap removing portion for removing scrap such as a molded product runner adhering to the resin-sealed work from the work, and a scrap removing portion. In a transfer molding apparatus, which is provided below the scrap and is removed from the work, and a scrap storage unit for storing the scrap that has fallen, between the scrap removal unit and the scrap storage unit,
It is characterized in that a scrap processing unit is provided for crushing the falling scrap. Sealing device.

For example, the scrap processing section may be composed of a die for crushing scrap and a punch, or a roller or a screw for crushing scrap. In particular, it is suitable for use in a transfer mold apparatus that automatically performs resin sealing work in the resin sealing unit, scrap removal work in the scrap removal unit, and scrap crushing work in the scrap processing unit.

[0006]

[Operation] The operation will be described. Between the scrap removal section and the scrap storage section, a scrap processing section for crushing the falling scrap is provided,
The scrap storage unit can store finely crushed scrap.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings. In this embodiment, an automolding device for automatically sealing a lead frame (work) of a semiconductor device with a resin and removing scrap such as a molded product runner will be described as an example. First, the configuration of the automolding apparatus of the embodiment will be described with reference to FIGS. FIG. 1 is a partial front view showing a main part of an automolding apparatus of an embodiment, FIG. 2 is a side view showing a structure of a scrap removing section thereof, and FIG. 3 is a structure of a scrap processing section and a scrap accommodating section. It is sectional drawing which showed.

In the figure, reference numeral 10 denotes a resin sealing portion, which is formed in a strip shape and sequentially seals a lead frame 12 on which IC chips (not shown) are mounted and which is supplied with a thermosetting resin. The lead frame 12 has a supply mechanism 14
Is automatically supplied in the direction of arrow A via. In this embodiment, as shown in FIG. 2, the strip-shaped lead frame 12 is formed.
Are supplied in parallel. The resin encapsulation unit 10 is similar to the conventional transfer molding apparatus and includes the upper mold 16 and the lower mold 1.
8 and. The upper die 16 can be moved up and down by a vertical movement mechanism (not shown) (for example, a motor press device).
The two lead frames 12 are clamped between the lower mold 16 and the lower mold 18 moved downward, and the molten resin is filled into the cavity formed in the upper mold 16 and / or the lower mold 18. Resin sealing is performed.

Reference numeral 20 denotes a scrap removing portion, which is arranged in parallel with the resin sealing portion 10. The two resin-sealed lead frames 12 are sequentially supplied to the scrap removing unit 20. The scrap removing portion 20 is formed at the time of resin encapsulation and is scrap 26 such as a molded product cull or a molded product runner that is attached across two lead frames 12 (the plan shape is shown in FIG. 4). ) Is removed from the lead frame 12. The scrap removing unit 20 of this embodiment includes a die plate 22 and a punch plate 24. Die plate 22
A through hole 28a is vertically formed at a position corresponding to the scrap 26. The punch plate 24 can be moved up and down by an air cylinder 30, and when the punch plate 24 descends, the scrap 26 is pushed downward to remove the scrap 26 from the lead frame 12. The scrap 26 that has been removed falls downward through the through hole 28a inside the drop tube 32. In the present embodiment, the scrap 26 whose lengthwise direction is the feed direction of the lead frame 12 (the direction of arrow A, which is the direction perpendicular to the paper surface in FIG. 2).
3 can be removed at the same time. Therefore, the through hole 28
The a is also formed in a rectangular shape whose long sides extend in the same direction.

Reference numeral 34 is a duct, which is a scrap removing section 2
It is arranged below 0. The lower end of the drop cylinder 32 of the scrap removing unit 20 reaches the upper portion of the duct 34 (see FIG. 3). It should be noted that it is effective to form the shape of the drop cylinder 32 into a hopper shape that expands upward in order to concentrate the scrap 26 in the duct 34. The duct 34 is a passage for the scrap 26 that has been removed by the scrap removing unit 20 and is falling inside the drop cylinder 32, and has an open upper surface.

Reference numeral 36 denotes a scrap processing section, which is the duct 3
It is provided corresponding to the lower part of 4. A scrap processing unit 36 is provided to crush the scrap 26 that has been removed from the lead frame 12 by the scrap removal unit 20 and has dropped through the duct 34. The scrap processing section 36 includes a die 38 and a punch 40.
Is provided at the lower end of the duct 34. The punch 40 can be moved up and down by an air cylinder device 42 fixed inside the device. The scrap 26 falling in the duct 34 is stacked on the die 38. The die 38 has a vertical through hole 28b smaller than the scrap 26. The punch 40 can enter into the through hole 28b when it moves downward, and the clearance between the inner wall surface of the through hole 28b and the outer wall surface of the punch 40 is set to about 7.5 mm in this embodiment. Has been done. Therefore, die 3
A plurality of scraps 26 that have been dropped and stacked on
The downward movement of the punch 40 allows it to be crushed into strips of less than 7.5 millimeters. In addition, in the case of the present embodiment, by forming a hopper shape in which the upper portion opens in a rectangular shape,
A plurality of scraps 26 can be crushed at the same time by a set of scrap processing units 36. The shapes and sizes of the die 38 and the punch 40 are not particularly limited as long as the scrap 26 can be crushed into scrap pieces.

Reference numeral 44 denotes a scrap storage unit, which is provided inside the apparatus and below the scrap processing unit 36. The scrap accommodating section 44 is composed of a scrap box 46 which is a box body having an open upper surface. The opened upper surface of the scrap box 46 corresponds to the through hole 28b of the die 38, and is crushed by the scrap processing unit 36 to form the through hole 2b.
The scrap pieces falling through 8b can be accommodated inside. In addition to the scrap box 46, bag-shaped accommodating means may be adopted as the accommodating means for the scrap pieces.

Next, the operation of the automolding apparatus having the above structure will be described. Two lead frames 1
The supply mechanism 14 sequentially supplies 2 in the direction of arrow A. The supply timing is a timing at which the timings of the resin sealing work in the resin sealing unit 10 and the scrap 26 removing work in the scrap removing unit 20 are synchronized. In the scrap removing unit 20, when the lead frame 12 with the scrap 26 attached is supplied onto the die plate 22,
When the air cylinder 30 operates to move the punch plate 24 downward, the protrusion 48 presses the lead frame 12 supplied onto the die plate 22, and the punch plate 24 pushes the scrap 26 downward. Due to this pushing force, the scrap 26 is broken and removed from the lead frame 12. In addition, if the scrap 26 is formed with, for example, a V-shaped groove so that the scrap 26 is easily broken, the scrap 26 can be reliably removed with a small pressing force. In that case, a protrusion corresponding to the V-shaped groove may be provided on the upper mold 16 and / or the lower mold 18 of the resin sealing portion 10.

In the scrap removing section 20, the lead frame 1
The scrap 26 removed from No. 2 falls through the through hole 28a and the dropping cylinder 32, enters the duct 34, slides downward in the duct 34, and reaches the die 38. Since the through hole 28b of the die 38 is smaller than the scrap 26, the scrap 26 that has fallen on the die 38. If multiple scraps 26 fall, the scraps 26
8 is stacked. The air cylinder device 42 of the scrap processing unit 36 is used for the air cylinder 3 of the scrap removing unit 20.
It is driven synchronously or asynchronously with the operation of 0. When the punch 40 moves downward with this drive, the die 3
The scrap 26 on 8 is crushed, and the crushed scrap 26 becomes a scrap piece and collects in the scrap box 46 of the scrap storage part 44 through the through hole 28b. The lead frame 12 from which the scrap 26 has been removed is sequentially sent to a subsequent process (for example, a trimming process) by the supply mechanism 14.

Since only the finely crushed scrap pieces are stored in the scrap box 46 of the scrap storage section 44, the scrap box 46 is different from the conventional transfer mold apparatus without the scrap processing section 36.
The time it takes to fill up can be extended considerably. Therefore, it is not necessary to frequently replace the scrap box 46.
The use of an automolding apparatus that automatically performs the scrap removing work in the scrap removing unit 20 and the scrap crushing work in the scrap processing unit 36 enables a long-time automatic operation and is particularly effective because it can improve productivity. Although various preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments. For example, the scrap processing unit 36 may include the die 38 described above.
In addition to the punch and the punch 40, a system such as a roller or a screw for crushing the scrap 26 may be provided.
Of course, many modifications can be made without departing from the spirit of the invention.

[0016]

When the transfer molding apparatus according to the present invention is used, a scrap processing section for crushing the scrap that has fallen is provided between the scrap removing section and the scrap accommodating section. Since the crushed scrap can be stored in the storage unit, it is possible to extend the time when the scrap processing unit is full. Therefore, it is not necessary to frequently replace the scrap box or the like in the scrap processing section. In particular, since it is not necessary to frequently replace the scrap box in the scrap processing section, the resin sealing work in the resin sealing section, the scrap removing work in the scrap removing section, and the scrap crushing work in the scrap processing section are automatically performed. When used in an automolding device, long-term automatic operation is possible, which has the remarkable effect of contributing to productivity improvement.

[Brief description of drawings]

FIG. 1 is a partial front view showing a main part of an automolding apparatus of an embodiment of a transfer molding apparatus according to the present invention.

FIG. 2 is a side view showing the structure of a scrap removal unit.

FIG. 3 is a cross-sectional view showing the structures of a scrap processing unit and a scrap storage unit.

FIG. 4 is a plan view showing the shape of scrap.

[Explanation of symbols]

 10 Resin Sealing Section 12 Lead Frame 20 Scrap Removal Section 26 Scrap 36 Scrap Processing Section 38 Die 40 Punch 44 Scrap Storage Section

Claims (5)

[Claims] 1. A resin sealing part for sealing a work with resin, a scrap removing part for removing scrap such as a molded product runner adhering to the resin-sealed work from the work, A transfer molding apparatus, which is provided below the scrap removing unit and includes a scrap receiving unit for receiving the scrap that has been removed from the work and has fallen, wherein the scrap removing unit and the scrap receiving unit are provided. The transfer molding apparatus is provided with a scrap processing section for crushing the scrap that has fallen. 2. The transfer mold apparatus according to claim 1, wherein the scrap processing section includes a die and a punch for crushing scrap. 3. The transfer mold apparatus according to claim 1, wherein the scrap processing unit includes a roller for crushing scrap. 4. The transfer mold apparatus according to claim 1, wherein the scrap processing unit includes a screw for crushing scrap. 5. A resin sealing work in the resin sealing portion,
The transfer mold apparatus according to claim 1, 2, 3 or 4, wherein the scrap removing operation in the scrap removing section and the scrap crushing operation in the scrap processing section are automatically performed.