JPS59179314A - Molding device of resin - Google Patents

Abstract

PURPOSE:To contrive an improvement in the rate of operation and molding yield of multiplunger type molding device of resin, by providing a function pushing up piled up tablets from the lower part, grasping the top tablet and supplying the same into a pot of an uppr metal die. CONSTITUTION:A tablet sticks 2, 2'... are loaded with resin tablets 3, 3'... and push up plate 23 moving vertically is planted with a push up rods 22, 22'... pushing up the tablet. The tablet 3 exposed one by one on each of the tablet sticks is entered into penetrating through tunnels 27, 27'... of the tablets. A clamper of a holding structure 28 holding the outside of the tablet by pinching the same is provided in this place. Then a tablet holder 26 is carried to a place above an upper metal die 12a of a multiplunger type resin molding structure 11 through a carrying cylinder 33, the penetrating through tunnel of the tablet is made concentric with a pot 13 of the upper metal die and the tablet holder 26 is made to fall spontaneously into the pot by giving instructions to the clamper. With this construction, the rate of operation and molding yield are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a resin molding device, and more particularly to improvements in a multi-plunger type resin molding device used for resin molding of resin molded semiconductor devices.

[Technical background of the invention]

An example of a conventional multi-plunger type resin molding device is shown in FIG. In the figure, (1) is a resin tablet alignment mechanism, and the tablet snacks (2), (2)..., which are arranged vertically in parallel, are arranged with resin, respectively, as shown in Figures 2 and 3. A resin tablet molded into a tablet shape (31, (3')...) is loaded, and a shirt flap plate (4) that slides on the lower end is provided to support the tablet. A first cylinder (5) provided on the side is equipped with a through hole (4a) shaped to allow the resin tablet to pass vertically during the sliding process.
) is driven horizontally by the tablet to slide onto the bottom edge of the tablet snack. Next, for the plurality of resin tablets supported by the shutter plate, through holes (6), (6)... ( A stop plate (7a) for horizontally pushing the l/gin tablet with one through hole for each tablet snack and a part of the side surface exposed in these through holes is connected to the second cylinder (7a). ) is driven by. This stop plate (7a) moves forward and backward alternately with the shirt stopper plate (4) to prevent the resin tablet at the lower end of the tablet snack (3), (3)
... is dropped and placed in the tablet transport jig (8) located below. The tablet conveyance jig (8) is composed of an upper plate (8a) and a lower plate (8h) each having a slightly mortar-shaped through hole corresponding to each tablet snack.
Furthermore, a partition plate (8c) is slidably inserted into the mating surface of the upper plate and the lower plate. The resin tablet dropped from the diagonally above tablet snack is placed in the through hole (9a) of the upper plate (8a) so as to land on the partition plate (8c).

The slanted transport jig (8) is connected to the first and second cylinders (
5), the third cylinder (
10a) and is conveyed onto the mold 021 of the adjacent multi-plunger resin mold section (old).

The multi-plunger resin mold part 01) is a mold for resin molding (as shown in Figs. 1, 3, and 4r), an upper mold (12a) and a lower mold (1-2b) The openings (9b) of the lower plate (8b) of the conveying jig correspond to the holes (13), (13...) which are placed on the mating molds and opened on the top surface of the stopper mold (12a). By removing the partition plate (8c) with the fourth cylinder (10h) provided in parallel to the third cylinder (10a), the resin tablet is securely inserted into the pot via the through hole (9b) of the lower mold. The upper mold (12a) and the lower mold (12a) are loaded in the multi-plunger resin mold section of j.
After the lead frame 04) is clamped in advance between the pot and the lead frame 04) and the resin tablet loaded in the pot is melted, the multi-plungers 0, (1...) descend from above, and the resin reaches the gate part. It fills cavities 07), e17+, etc. through ae, o6), and so on.

Next, (18) in the figure is the base of the mold press, which is equipped with control signal transmission, power sources, various adjustment mechanisms, etc. for the above-mentioned parts to accomplish the diagonal mold processing according to a predetermined schedule.

[Problems with Background Art] The conventional technique of tilting upwards has the following disadvantages because the tablets are fed using the natural falling of the tablets.

(At) Since the weight of one tablet is light at 0.2 to 7 grams, when it falls naturally along the path from the tablet snack to the top plate and from the top plate to the pot, it often gets caught on the walls along the way.

(bl If the stop plate is not pressed properly, it will cause a tablet) (3
All the tablets above (3') fall and the path is blocked.

(c) Taplets stopped on the falling path from the tablet snack to the upper plate) When the K shutter plate (4) collides with the tablet, the tablet is crushed and the machine stops.

(, l) Tablets at the bottom of a stack are more likely to chip because they are subject to a greater impact due to natural falling.

As a result, molds that are not filled with tablets of insufficient weight, molds that are insufficiently filled, and mold cavities occur, resulting in a decrease in molding yield. In addition, a chipped tablet is likely to get caught in the falling path of the tablet, which may cause it to fall incorrectly or enter the tablet supply mechanism, resulting in malfunction.

(e) The tablet supply mechanism is complicated, making repair, maintenance, and inspection difficult in the event of a breakdown.

(f) To prevent tablet shortages, it is necessary to use expensive hard tablets (hardened by increasing density).

(gl It is powerful because it allows you to use tablets with significantly different lengths.

[Purpose of the invention]

This invention improves the problem of sloping. It improves the tablet feeding rate in the molding device, improves the operating rate and molding yield, and makes it possible to use tablets with low density and tablets with different lengths. The purpose of the present invention is to provide a multi-plunger type resin molding device that can handle the production of a wide variety of products using different amounts of molding resin.

[Summary of the invention]

This invention pushes up stacked tablets from below,
The tablets are fed by a tablet feeding mechanism that has the function of grasping the topmost tablet and feeding it into the pot of the upper mold.

[Embodiments of the invention]

Below, this invention will be described in detail with reference to FIG. 5 and subsequent figures for one embodiment of the resin molding apparatus, with particular emphasis on the tablet supply and conveyance mechanism. In the resin molding apparatus, parts that are the same as those of the conventional apparatus are designated by the same reference numerals in the drawings, and their explanation will be omitted. (21) in FIG. 5 is a resin tablet alignment mechanism, and as shown in FIG. 6, tablet snacks f21, which are vertically arranged in parallel,
(2')...Resin tapelets made of dark resin molded into tablets) (3).

(3') ... is loaded and pushes up the resin tablet under each tablet snack (c), (2
2')... are planted on a push-up plate I23) that moves up and down. This push-up plate (231U) is pushed up by a pair of screws C provided below it by a step motor C251, and the number of revolutions of the step motor is set so that the push-up pitch corresponds to the length of one resin tablet. Therefore, the number of revolutions of the step motor can be changed to correspond to the push-up amount for tablets of different lengths, making it easy to switch to other types with different amounts of resin.

The resin tablets exposed one by one on each tablet snack as if diagonally upward are moved to the tablet insertion tunnels (27), (27') and (27') provided in the tablet holder (a), which is positioned above the tablet snack. ...Go inside. The tablet insertion tunnel of the tablet holder is provided with a support mechanism (2 clampers) that clamps and supports the outer surface of the resin tablet.This clamper is equipped with an internal magnet (2 clampers) as shown in Figure 7. The resin tablet e is closed and grasped by the repulsion or suction force generated by energizing it. Note that (301 is a spring;
Controls the clamper when the magnet wire is de-energized. Further, the cushion 01 is provided on the opposite surface of the gripping member in order to prevent the gripping member 01) from directly contacting the resin tablet and causing damage such as chipping when the resin tablet is gripped by the clamper. Next, the clamper shown in FIG. 8 has a cam (32) for gripping, and a spring bolt for releasing the grip.

Next, the tablet holder (A) is transported by the transport cylinder (G) to the upper mold (12a) of the multi-plunger-type jinmold mechanism circle, and the tablet insertion tunnel is passed through the upper mold's bottom (+3). ) Make it K coaxial. Also, the clamper is commanded to perform an operation opposite to that for gripping the resin tablet, for example, to stop energizing the magnet (two screws).As a result, the resin tablet naturally falls into the pot of the clasp type.

Next, after pulling back the tablet holder (26), the multi-plunger (1!51) is lowered in the same multi-plunger resin mold section as in the prior art to accomplish resin injection and molding.

〔Effect of the invention〕

According to the multi-plunger type resin molding device according to the present invention, since the resin tablet is pushed up from the tablet alignment mechanism to the tablet holder, it has the following advantages.

(a) Resin tablets do not get caught or clogged, and the operating rate of the turntable and resin molding equipment is 61% higher than before.
I saw an improvement from % to 86ch.

(b) Since the occurrence of resin tablet chips has become more frequent, the number of unfilled and molded holes has decreased, and the mold yield has improved from 92 chips to 98%.

(c) Since the resin tablet supply mechanism has been simplified, repair, maintenance, and inspection are easier.

(dl) It has become possible to use low-density, inexpensive resin tablets.In other words, the compression ratio (tablet density/molded product density) has increased from 91% to 85%, and the price of the resin tablet has increased to 10% compared to the previous model. We saw a reduction in chi.

(e) Tablets of different lengths can be handled by simply changing the rotation speed of the step motor and the amount of push-up, so it can be easily applied to a variety of products with different amounts of resin.

(f) Falling of resin powder has been drastically reduced, and mistakes in detecting abnormalities in resin tablet supply and transportation have been reduced.

(g) The preheating mechanism (high-frequency heating device) of the tablet was easily increased by -1.

[Brief explanation of drawings]

Figure 1 is a front view of a conventional multi-plunger type resin molding device, Figure 2 is a sectional view of the tablet alignment mechanism, and Figure 3 is a front view of a conventional multi-plunger type resin molding device.
4 is a top view of the lower mold on which the molded product is placed, FIG. 5 is a front view of a multi-plunger type resin molding device according to an embodiment of the present invention, and FIG. 6 is a perspective view of the conveyance mechanism section. 7 is a perspective view showing a tablet alignment mechanism, a tablet holder, and a tablet holder transport mechanism, and FIGS. 7 and 8 are top views, respectively, for explaining the resin tablet support mechanism. 2.2'... Tablet stick 3.3'
・・・Resin tablet transfer Mold 13 Pot erosion of mold mold
Tablet alignment mechanism 22.22'... Push-up Rondo 23
Push-up plate 25 Step motor 26 Tablet holder 27.27'... Tablet insertion tunnel agent Patent attorney Inoue-Otokofue a Fat No. 5 Zuchoji Li Bar No. 7 Figure J Figure 8 B

Claims (1)

[Claims] A tablet aligning mechanism comprising parallel tablet snacks and a push-up rod that pushes up a plurality of resin tablets loaded onto each of these tablets in parallel; a tablet aligning mechanism that includes a push-up rod that pushes up a plurality of resin tablets loaded onto each of these tablet snacks in parallel; A tablet holder equipped with a tablet insertion tunnel incorporating a support mechanism for pinching and supporting the outer surface of the tablet and releasing the support, and a tablet holder conveyance for conveying the tablet holder between a tablet snack and a multi-plunger type resin mold mechanism. A multi-plunger type resin molding device, comprising: a mechanism; and a multi-plunger resin mold section having a pot of a mold die facing the tablet insertion tunnel.