JPS6058813A - Mold - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a mold for a resin mold apparatus such as a transfer mold or an injection mold, and a press machine.

[Background technology]

Transfer resin molding equipment is generally used for sealing (packaging) in the manufacture of resin molded semiconductor devices. In this equipment, the lead frame with chips mounted and wire tensioned is sandwiched between the upper and lower molds (mold clamping), and then placed into a pot in the center of the upper mold. , Plunge the resin tablet placed on the cull in the center of the lower mold, melt it under pressure with Y, and feed the resin into the cavity through the resin flow path (main 7 runner, sub runner, gate) formed by the upper and lower molds. The 1-node frame part located inside is covered with resin. Moreover, since the resin in the cavity and the resin flow path is hardened by kear treatment, the upper mold and the lower mold are separated after hardening (mold opening) and then taken out as a molded product.

By the way, in order to form a good molded product, the upper mold and the lower mold need to face each other with high precision.

Conventionally, the upper mold and lower mold were aligned by fixing the upper mold to the four corners of the upper mold plate, and using guide posts installed at the four corners of the lower mold plate to fix the lower mold. A so-called guide post/pussy structure (described in Electronic Materials Magazine, July 1966 issue, p. 79) is known in which positioning is achieved by fitting.

Furthermore, as a positioning structure for the upper and lower molds, the present applicant provided concave blocks at the center of each of the four peripheral parts of the lower mold plate, and provided convex blocks at the center of each of the four peripheral parts of the upper mold plate, thereby clamping the mold. We have developed a block fitting structure that allows alignment of the upper and lower molds by fitting a concave block and a convex protrusion.

However, the inventors have found that the side structure has the following problems and is not preferable.

(1) The guide posts and guide bushings should be fixed to the template (upper template, lower template) at the four corners of the template, avoiding the upper and lower molds. Therefore, the overall size of the mold (molding mold) including the template becomes large, which causes a decrease in mold M degree and a decrease in transport and installation work efficiency.

(2) The guide post/button structure has guide posts on both sides of the front of the mold, and the tips of these guide posts protrude from the parting line (parting surface) of the mold, making it easy to automatically load the lead frame. It becomes a hindrance when considering automatic removal of molded products.

(3) The block structure has a block placed at the center of each of the four sides of the upper and lower molds. Therefore, the block will be located in the center of the front of the mold.

Furthermore, the tip of the convex block fixed to the upper mold plate protrudes beyond the parting line of the mold. For this reason, when opening the mold, for example, if a roller of an automatic cleaning device is inserted between the parting surfaces of the mold to clean the parting surface of the mold, the convex prongs on the front of the mold will It becomes a hindrance.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a molding technique that does not have a structural member that protrudes beyond the parting line on the front surface of the mold.

Another object of the present invention is to provide a mold that has high precision of mold fitting and can be downsized.

The above and other objects and novel features of the present invention include:
It will become clear from the description of this specification and the accompanying drawings.

[Summary of the invention]

A brief overview of typical inventions disclosed in this application is as follows.

In other words, pro-roughs are placed in the center of both sides of the mold,
By adopting a structure in which the molds are matched in the X and Y directions by fitting these two sets of blocks, the front surface of the mold can be opened without locating a structural member that would act as a trench on the front surface of the mold. Furthermore, by adopting a structure in which thin blocks are installed, the size of the entire mold can be reduced.

〔Example〕

FIG. 1 shows a mold (molding mold) according to an embodiment of the present invention.
FIG. 3 is a front view showing the main parts of the lower mold, FIG. 3 is a plan view showing the main parts of the lower mold, and FIG.

As shown in FIG. 1, the mold consists of a lower mold unit 1 and an upper mold unit 2, and is used by being attached to a transformer 7 allezine molding device (not shown). The lower mold unit 1 includes a lower mold 3° and a lower mold plate 4 to which this lower mold 3 is attached. 5. Bottom outer plate fixed to a floating plate (not shown) of the transfer resin molding device. It consists of a bottom spacer block 6 disposed between the bottom outer plate 5 and the lower mold plate 4. Further, as shown in FIGS. 2 and 3, female positioning blocks 7.8 are respectively disposed in a protruding state at the center portions of both side edges of the lower mold mounting surface of the lower mold plate 4. As shown in FIGS.

On the other hand, the upper mold unit 2 is the upper mold 9. Upper mold plate 10 to which this upper mold 9 is attached. Top outer plate 1 fixed to a fixed plate (not shown) of the transfer resin molding device
1. It consists of a top spacer block 12 arranged between this top outer plate 11 and the upper mold plate 10. In addition, as shown in FIG. 3, the t &
A male positioning block 17.18 is protruded and fixed, the tip of which has protrusions 15, 16 that fit into the recesses 13, 14 of the mold positioning block 7.8 (see also FIG. 2).
.

The male positioning block 17, 18 consists of a flat plate part 19 and a protrusion 20 protruding from the center of the flat plate part 19, each having a convex cross section.
are fixed to the upper mold plate 10 in a back-to-back manner so that they are located on the outside. Therefore, the female positioning block 7
．． 8 is provided with a recess 13° 14 at the upper end into which the protruding portion 20 and the flat plate portion 19 are inserted. That is, the upper end of the female positioning block 7.8 has a stepped structure with one step lower on the inside, and the outer protruding plate 21 forming the stepped state.
A groove extending downward to a stepped height is provided in the center of the block, and this groove serves as a recess 13 into which the protrusion 20 of the male positioning block 17, 18 is inserted. Further, the other recess 14 of the female positioning block 7.8° has a structure in which the inner side created by the stepped surface 22 and the inner surface of the protruding plate 21 is open. Therefore, when the lower mold unit 1 is raised and the mold is clamped, the positioning of the male mold in the Block 17. I
This is done by fitting the EL protrusion 20, and Y
Directional positioning is done using male positioning blocks 17.18
This is done by restricting the outer surface of the flat plate portion 19 to the inner surface of the protruding plate 21 of the female positioning block 7.8.

Also, positioning blocks 7, 8. 17. The corners of the fitting portion 18 are chamfered or rounded to ensure smooth fitting.

Note that FIG. 2 is a plan view showing the main parts of the lower mold unit, and the lower mold 3 is attached to the rectangular lower mold plate 4. As shown in FIG.

The lower mold 3 includes a center block 25 having a main surface including a cull 23 and a main runner 24 connected to the cull 23 and branching from the middle, and a sub-runner 26 on the main surface. gate 2
7. Multiple chase blocks 2 with cavities 28
It consists of 9.

In addition, although the upper mold is not detailed, the chase block 2
9 and a chase block 30 having a cavity (not shown) and a center block 32 having a pot 3'1.

Therefore, when such a mold is used, the lower mold 3 and the upper mold 9 are aligned with each other by the positioning blocks 7.8, 1.
7. Fix to a transfer resin molding device while being fitted through 18, and perform resin molding. That is, after the object to be molded is placed on the parting surface of the lower mold 3, the mold is clamped. During this mold clamping, the lower mold 3 and the upper mold 9 are positioned by mutual positioning blocks 7, 8. 17. 1
8 for positioning in the XY directions. Therefore, a preheated resin tablet (not shown) is put into the bot 31 from the input port 33 of the upper mold unit 2,
By pressurizing with a plunger (not shown), the molten resin on the cull 23 is transferred to the main runner 24, sub-runner 26, and so on. The resin is sequentially fed into the resin flow path such as the gate 27 to fill the cavity 28 with the resin. Furthermore, after applying resin curing, the mold is opened and the molded product is removed, thereby completing one transfer resin molding process.

〔effect〕

(1) According to the present invention, the uneven positioning blocks 7 and 8 that fit into each other define the mutual positional relationship of the lower mold 3 and the upper mold 9. 17. 18 is used. Further, the uneven positioning blocks 7.8°ff7.18 are not installed on the front and back sides of the mold, but are placed on both sides.

As a result, the objects to be molded (including molded products) are placed on the front and back surfaces.
An automatic machine for loading and unloading the parts, or a cleaning device for cleaning the parting surfaces, cavities, etc. of the upper mold 9 and lower mold 3 is installed, and these operating parts are installed between the upper and lower molds when the mold is opened. This makes it easier to automate resin mold work.

(2) According to the present invention, the uneven positioning blocks 7.8, 17, and 18 degrees provided on the upper and lower mold units 2.1 are positioned in the X direction by protruding into the recesses 13 defined on both sides by the protruding plates 21. Since the structure in which the strips 20 fit together is adopted, the length of the female positioning block 7.8 in the X direction,
That is, although @a of the female positioning block 7.8 is longer, positioning in the Y direction is performed by two female positioning blocks 7.

One recess is formed by the inner surface of the protruding plate 21 of No. 8, and two male positioning blocks 17.1 are inserted into this one recess.
Since the female positioning block 7.8 has a structure in which one convex part whose outer surface is the outer surface of the flat plate part 19 of 8 is fitted, the female positioning block 7.8 has a concave part 14 whose inner side is open.
This means that the length of the female positioning block 7.8 in the Y direction, that is, the thickness b, can be made smaller than in the case of a concave structure defining both sides. therefore,
The male positioning block 17.18 that fits into the female positioning block 7.8 has the same dimensions, and the dimensions of the upper and lower mold plates 10, 4 can be reduced. Effects such as improved accuracy and improved efficiency of transportation and installation work can be obtained.

(3) According to the present invention, the number of positioning parts for the mold is reduced because it has a two-set positioning block structure compared to the conventional four-set guide bush packaging or four-set block structure. It is also possible to reduce mold manufacturing costs.

(4) Due to (1) to (3) above, high precision positioning of the mold, miniaturization, and improved usability due to the absence of any member blocking the front and back parts, 8! ! A synergistic effect can be achieved by reducing manufacturing costs and providing high performance molds.

Although the invention made by the present inventor has been specifically explained above based on Examples, it goes without saying that the present invention is not limited to the above Examples and can be modified in various ways without departing from the gist thereof. Nor.

[Application field]

In the above explanation, the invention made by the present inventor was mainly applied to the transfer resin molding technology, which is the background field of application, but the invention is not limited to this, for example, injection molding, etc. The present invention can also be applied to a mold for a press machine or a mold for a general press machine, and the same effect can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the main parts of a mold according to an embodiment of the present invention, FIG. 2 is a plan view showing the main parts of the lower mold, and FIG. 3 is a perspective view showing the positioning block.

Claims (1)

[Claims] 1. A mold having an upper mold unit and a lower mold unit, wherein the upper mold plate of the upper mold unit and the lower mold plate of the lower mold unit are provided at the center portions of both side edges so as to fit into each other when the mold is clamped. A mold characterized in that a pair of positioning blocks for positioning a mold and a lower mold are provided.