JPH0890106A - Die assembly for molding - Google Patents

Abstract

PURPOSE: To prevent that an excessive load occurs on a positioning guide means such as a guide block, etc., and early wear occurs, and to properly and correctly perform the positioning of respective chase blocks when performing resin molding with chase blocks. CONSTITUTION: On either base plate 1b out of a pair of base plates 1a and 1b, a chase block 2b is provided so that it can be moved along with the same direction as the surface direction of the base plate 1b. And, on the outer surroundings of the chase block 2b, plural elastic bodies 4 are provided, which give a pressing force or tension in a direction making this chase block 2b return to an original specific place to the chase block 2b when this chase block 2b is shifted along with the surface direction of the base plate 1b from a prescribed specific place.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding die device used by being incorporated in a transfer molding machine or the like.

[0002]

2. Description of the Related Art For example, when resin molding is carried out in packaging of semiconductor electronic parts, a transfer molding method or the like is adopted. Conventionally, in such a case, molding having a structure as shown in FIG. The mold equipment was often used. That is, in this conventional molding die device, a pair of upper and lower chase blocks 2c and 2d in which a plurality of cavities 20a or cores (not shown) are formed are provided with a knock pin 5 in the same manner as general die fixing means. By using it, it is positioned and fixed to each base plate 1c, 1d.

[0003]

However, in the above-mentioned conventional molding die apparatus, since both upper and lower chase blocks 2c and 2d are fixed to the base plates 1c and 1d respectively, each chase block 2c is fixed. , 2d when the guide blocks 81 and the guide holes 81a are fitted to each other to align the chase blocks 2c and 2d with each other, when the amount of displacement of the chase blocks 2c and 2d is small. Even in this case, however, a very large load is generated in both the guide block 81 and the guide hole 81a. That is, conventionally, when the pair of upper and lower chase blocks 2c and 2d are misaligned, the guide block 81 and the guide hole portion 81a are forcedly fitted to each other, resulting in a very large resistance force. Was there.

Therefore, conventionally, the guide block 8 is used.
1 wears in a short period of time, and as a result, it becomes difficult to align the chase blocks 2c and 2d at an early stage.
There has been a problem that the mold of the resin molded product is misaligned.

The present invention has been devised under such circumstances, and when resin molding is performed using a chase block, an excessive load is generated on a positioning guide means such as a guide block. It is an object of the invention to prevent wear from occurring at an early stage so that the chase blocks can be properly and accurately aligned.

[0006]

In order to solve the above problems, the present invention takes the following technical means.

That is, in the invention described in claim 1 of the present application, a chase block is attached to each of a pair of base plates arranged so as to face each other, and each of the chase blocks has the above-mentioned pair. In the molding die device, there are provided mutually-fitting convex and concave positioning guide means for guiding the alignment of the chase blocks when the base plates are brought close to each other for mold clamping. Then, in any one of the pair of base plates, the chase block is provided so as to be movable along the same direction as the surface direction of the base plate, and the outer periphery of the chase block is This chase block is displaced from a given location along the surface of the base plate. The resulting pressing force or tensile force in a direction to return the chase block based on a predetermined point in time is characterized by a plurality of elastic bodies to be added to the chase block is provided.

According to a second aspect of the present invention, in the molding die apparatus according to the first aspect, the plurality of elastic bodies are arranged in front of and behind and right and left of a chase block provided on the one base plate. Each part of the outer peripheral side of
The fixed frame is provided so as to be interposed between each of the at least one fixed frame and the at least one fixed frame attached to the one base plate so as to face each of these portions.
In order to prevent the chase block from rising above the surface of the one base plate by a certain size or more, a pressing piece facing or sliding against the surface of each side edge of the chase block is provided.

[0009]

In the invention described in claim 1, since the chase block attached to any one of the base plates can move in the same direction as the surface direction of the base plate, it is attached to each base plate. When the two chase blocks are misaligned, one of the chase blocks can be moved along the surface direction of the base plate by the positioning guide action when the positioning guide means are fitted to each other. Becomes Therefore, it is possible to reduce the load or resistance when fitting the positioning guide means to each other, and to reduce the wear. As a result, it is possible to solve the problem that the chase blocks cannot be properly aligned with each other due to the early wear of the positioning guide means, and it is possible to obtain a resin molded product of good quality without mold deviation. Can be obtained.

Further, since the chase block provided on the one base plate is constantly subjected to a force such that it is positioned at a predetermined fixed position by the pressing force or the pulling force of the elastic body, this chase block Can be preliminarily positioned and arranged at a position where it can be properly aligned with the other chase block. That is, if the chase block is simply provided so as to be movable in the direction along the surface of the base plate, the chase block will be largely displaced when the base plate vibrates, and the chase block will no longer be aligned with the other chase block. May occur, but
Such a fear can be appropriately eliminated by the positioning action of the chase block by the elastic body. Therefore, it is possible to eliminate an adverse effect caused by movably providing the chase blocks, and it is possible to obtain an excellent effect that the work of aligning the chase blocks can be appropriately performed.

According to the second aspect of the invention, an elastic body is provided between each portion of the outer peripheral side surface of the chase block and a fixed frame attached to the base plate so as to face each of these portions. With this configuration, the elastic body can be easily and surely attached. Further, since a pressing piece is provided on the fixed frame to prevent the chase block from rising above the surface of one of the base plates by a certain size or more, the chase block is largely lifted due to vibration of the base plate or the like. This can be solved, and the advantage that the chase block can be properly attached and held to the base plate can be obtained.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention will be described below.
A specific description will be given with reference to the drawings.

FIG. 1 is a partially sectional front view showing an example of a molding die apparatus according to the present invention, FIG. 2 is a plan view taken along the line II of FIG. 1, and FIG. 3 is a line II-II of FIG. FIG.

In FIG. 1, the molding die apparatus is such that a pair of upper and lower chase blocks 2a and 2b are attached to the respective surfaces of a pair of upper and lower base plates 1a and 1b. Of these, the upper chase block 2a is positioned and fixed to the upper base plate 1a by a knock pin 5, while the lower chase block 2b is
It is not fixed on the lower base plate 1b. This lower chase block 2b is a lower base plate 1b.
It is placed on the lower base plate 1b so as to be horizontally movable along the surface direction (direction of arrow a).

Further, the lower base plate 1b includes:
In addition to the chase block 2b, a total of four fixed frames 3
(3a to 3d) are attached, and a plurality of coil springs 4 as elastic bodies according to the present invention are provided between each of the fixed frames 3 and the chase block 2b.

The set of chase blocks 2a, 2b
Is formed by mounting a core block or a cavity block as a mold body in which a plurality of cores 20 or cavities 20a are respectively formed on a predetermined metal frame body. As shown in FIG. 3, the guide blocks 21, 21 formed in a convex shape are formed at the left, right, front and rear ends of the upper surface of the lower chase block 2b.
Is provided. A chamfered taper surface 22 is formed at the tip of each of these guide blocks 21 so that it is tapered toward the tip. Each of the guide blocks 21 is formed separately from the chase block 2b, for example, and is detachably screwed to the chase block 2b by a bolt (not shown) or the like. On the other hand, on the lower surface side of the upper chase block 2a, a pair of left and right notched guide holes 23 for fitting the guide block 21 is provided.

The four fixed frames 3 (3a to 3d) are formed in a substantially L-shaped cross section, and as shown in FIG. 2, a total of 4 in front, back, left and right of the lower chase block 2b.
After being arranged in a hollow rectangular shape so as to surround each outer peripheral side surface 24a to 24d of the location, it is attached to the lower base plate 1b using bolts 6 or the like. At the time of this attachment, in order not to hinder the horizontal movement of the chase block 2b, as shown in FIG. 1, a gap S is formed between each part of the outer peripheral side surfaces 24a to 24d of the chase block 2b and the inner side surface 30 of each fixed frame 3. Are considered to be formed.
Note that each of these fixed frames 3 does not necessarily need to be mounted in such a manner as to surround the entire circumference of the chase block 2b, but is mounted in such a manner that they are intermittently arranged at locations facing each of the outer peripheral side surfaces 24a to 24d. May be.

In addition, an inward horizontal pressing piece 3 that approaches the chase block 2b is provided on the upper portion of each fixed frame 3.
1 is provided. The pressing piece 31 has a concave step portion 26 formed on each side edge portion of the entire circumference of the chase block 2b.
It is set so as to face the front surface 25 through a constant gap S1. As a result, when the lower chase block 2b is lifted from the lower base plate 1b, the surface 25 of the side edge portion of the lower chase block 2b is pressed by the pressing piece 3.
1 is abutted, and further lifting is prevented. In the present invention, when the pressing piece 31 is formed, the gap S1 is not formed between the surface 25 of the side edge portion of the chase block 2b and the pressing piece 31, and the horizontal movement of the chase block 2b is not hindered. The pressing piece 31 may be brought into sliding contact with the surface 25 of the chase block 2b to some extent.

A compression spring, for example, is used as each of the coil springs 4. Each of these coil springs 4
The chase block 2b is provided so as to be interposed between the outer peripheral side surfaces 24a to 24d and the inner side surface 30 of each pressing piece 31. The chase block 2b receives a pressing force F by the coil springs 4 from the front, rear, left, and right directions, so that the chase block 2b coincides with the upper chase block 2a at a predetermined position, for example, four fixing frames 3 in total. It is set to be located exactly in the center of the area surrounded by. When mounting the coil spring 4, the mounting of the coil spring 4 may be ensured by, for example, forming a recess 32 into which one end of each coil spring 4 is fitted in each inner side surface 30 of the fixed frame 3. . The pressing force F of each coil spring 4 is set so as not to hinder the horizontal movement of the chase block 2b.

Next, an example of use and operation of the molding die device having the above construction will be described.

In order to perform the resin molding operation, first, the pair of base plates 1a and 1b are previously attached to, for example, a floating plate 7a or a movable plate 7b of a transfer molding machine (not shown), and the chase blocks 2a and 2b are connected to each other. Are placed facing each other. In this case, although the lower chase block 2b can move in the horizontal direction of the arrow a, it can be positioned at a predetermined position by the pressing force F from the four sides of the plurality of coil springs 4, so that the lower chase block 2b can be moved up and down. The chase blocks 2a and 2b can be appropriately face-to-face arranged.

Even if a large vibration or the like occurs in the lower base plate 1b in the above-mentioned set state, this does not maintain the state in which the lower chase block 2b is displaced to an improper position. . Even if the lower chase block 2b is displaced due to vibration or the like, it is possible to immediately return the chase block 2b to the original predetermined position by the pressing force F of the coil spring 4.

Further, since the chase block 2b is prevented from rising above the lower base plate 1b by a certain size or more by the pressing piece 31 of the fixed frame 3, the chase block 2b is securely attached and held. It Further, this also makes it possible to favorably transfer heat from the lower base plate 1b functioning as a heater block to the chase block 2b, and keep the chase block 2b at a temperature suitable for heating the resin molding material. You can also

Next, after the above setting is completed, the lower base plate 1b is brought closer to the upper base plate 1a to perform mold clamping. In this case, the lower base plate 1b is attached to the lower base plate 1b in the state shown in FIG. When the lower chase block 2b rises, the guide blocks 21 and 21 move to the upper chase block 2
It is fitted in each guide hole 23 of a. At the time of this fitting, since the tapered surface 22 is formed on the tip end side of the guide block 21, the chase block 2
When the positions a and 2b are misaligned, the guide block 2 is adjusted so that the positions of the guide blocks 21 and the guide holes 23 are properly aligned as shown in FIG. 4, for example.
A horizontal force (arrow b) acts on 1 to exert the alignment guide action. Then, the lower chase block 2b moves in the direction of the arrow b against the pressing force F of the spring 4.

As described above, when the lower chase block 2b moves horizontally when the guide block 21 and the guide hole 23 are fitted, and the guide block 21 escapes,
Guide hole 23 that acts on guide block 21 by that amount
The pressing force on the guide block 21 and the guide hole 23 decreases.
The frictional force generated between the two can be reduced. as a result,
The wear of the guide block 21 can be reduced, and accurate alignment can be ensured for a long period of time. If the guide block 21 is worn due to long-term use, only the guide block 21 needs to be replaced.

In the above embodiment, a coil spring as a compression spring is used as a concrete example of the elastic body, but the present invention is not limited to this. As the elastic body according to the present invention, not only a coil spring as a tension spring may be used, but also other types of springs, rubber, air springs, etc. may be used.

In the above embodiment, the fixed frame 3 having the pressing piece 31 is provided on the outer periphery of the lower chase block 2b, and the fixed frame 3 and the chase block 2b are provided.
Although the coil spring 4 is provided between the outer peripheral side surface and the outer peripheral side surface (corresponding to claim 2), the invention of claim 1 is not limited to this. For example, an elastic body may be attached to the base plate 1b and the chase block 2b may be pressed by the elastic body, without providing a means such as the fixed frame 3 on the lower base plate 1b.

In addition, the specific construction of each part of the molding die device according to the present invention can be variously changed in design.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional front view showing an example of a molding die device according to the present invention.

FIG. 2 is a plan view taken along the line II of FIG.

FIG. 3 is a sectional view taken along the line II-II of FIG.

FIG. 4 is a sectional view of an essential part showing an example of a state where a guide block and a guide hole are fitted to each other.

FIG. 5 is a front view showing an example of a conventional molding die device.

[Explanation of symbols]

 1a Upper base plate 1b Lower base plate 2a, 2b Chase block 3 Fixed frame 4 Coil spring (elastic body) 21 Guide block (positioning guide means) 23 Guide holes (positioning guide means) 24a to 24d Outer peripheral side surface (of chase block) 31 Holding piece

Claims (2)

[Claims] 1. A chase block is attached to each of a pair of base plates arranged so as to face each other, and the pair of base plates are brought close to each other to perform mold clamping. A molding die device, which is provided with mutually-fitting convex and concave positioning guide means for sometimes performing a positioning guide between the chase blocks, wherein any one of the pair of base plates is provided. A chase block is provided on one of the base plates so that the chase block can move along the same direction as the surface direction of the base plate, and the chase block is provided around the outer periphery of the chase block from a predetermined fixed position. This chase block can be used as a starting point when misalignment occurs along the surface direction. The pressing force or tensile force in a direction to return to a predetermined position, wherein a plurality of elastic bodies to be added to the chase blocks are provided, the molding die apparatus. 2. The plurality of elastic bodies are provided on each of the front and rear and left and right outer peripheral side surfaces of the chase block provided on the one base plate, and at least one or more elastic bodies are attached to the one base plate so as to face these parts. The chase block is provided on the fixed frame so as to prevent the chase block from rising above a surface of the one base plate by a certain dimension or more. The molding die device according to claim 1, further comprising a pressing piece that faces or slides on a surface of the side edge portion.