JPH0127575B2 - - Google Patents

Description

[Detailed description of the invention] [Object of the invention] (Industrial application field) The present invention is directed to an IC (semiconductor integrated circuit device) or
The present invention relates to a storage tool suitable for storing lead frames used in the manufacture of LSI (large scale integrated circuit devices).

(Prior art and its problems) Conventionally, this type of storage device uses a mold to obtain a pair of cast metal members (die casting) with a U-shaped cross section, and then molds the inner surfaces of both U-shaped members to correspond to each other. After forming several guide grooves by cutting, etc., aligning both U-shaped members so that their openings match, and then fixing them with adhesives, screws, etc. to form a rectangular tube shape with openings at both ends. It is known what made up the block.

However, since the conventional type is die-cast, it is large and heavy, and since the upper and lower members are made separately and bonded together, the guide grooves are also separate. It has to be formed by cutting, which has drawbacks such as an increase in manufacturing steps and complication. In addition, it was difficult to align the guide grooves, resulting in a decrease in product yield. Furthermore, in the conventional device, since the guide grooves are formed to have a uniform depth and width, it is difficult to insert the lead frame, making it difficult to perform the work smoothly.

The present invention has been made in view of the above-mentioned circumstances, and allows for smooth and quick insertion of lead frames, as well as miniaturization and cost reduction of the device.
It is an object of the present invention to provide a lead frame storage device that can reduce manufacturing man-hours, simplify manufacturing processes, and provide a highly reliable product.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a structure in which symmetrical guide grooves are formed on opposing inner wall surfaces of a block that is an integrally molded body having openings at both ends. The guide groove is a tapered R groove that is deeper and wider at the end faces of the openings at both ends than at other parts.

(Function) Since it is an integrally molded body, there is no problem of difficulty in alignment, and the R groove of the above structure allows the lead frame to be inserted quickly and smoothly.

(Example) The present invention will be specifically described below with reference to Examples.
FIG. 1 is a schematic perspective view showing an embodiment of a lead frame storage device according to the present invention. In the figure, 1 is a lead frame storage device mainly consisting of a rectangular cylinder-shaped block (the one shown is a horizontally long rectangular parallelepiped-shaped rectangular cylinder with a narrow width) having openings 1A and 1A at both ends (left and right directions in the figure). For example, it is constructed as an integral molded body made of aluminum. U-shaped notches 1B, 1B are symmetrically provided in the upper and lower parts of the openings at both ends, and a pair of upright wall portions 1D, 1
On the inner wall surface of D, several guide grooves 3, 3 are formed at regular intervals along the openings 1A, 1A at both ends, and are arranged at mutually corresponding positions on both inner wall surfaces. As shown in FIG. 2, these several guide grooves 3 are formed with tapered R grooves 3A that are deeper and wider than other parts at the end faces of the openings at both ends of the block 1.

With the above configuration, the long lead frame 4 can be easily accommodated by inserting it from the opening side through the symmetrical guide grooves 3, 3. At this time, since deep and wide R grooves 3A, 3A are formed in the opening end surfaces of the guide grooves 3, 3, the insertion of the lead frame is performed smoothly, and there is no possibility that the lead frame will get caught at the entrance or fall off. There is nothing to do. In addition, the U-shaped notch 1
B and 1B are used to ensure that they do not get in the way when using jigs such as sprockets for transporting lead frames, and also function as confirmation windows to visually check the storage status. If there is no need to provide this function, it may not necessarily be provided.

Next, an example of a method for manufacturing the lead frame storage tool will be described with reference to FIGS. 3 to 5.

First, the extrusion process will be explained with reference to FIG. A male mold 5 in the shape of a rectangular parallelepiped is provided with a plurality of protrusions that are long along the lateral direction and spaced equally apart from each other on both sides (front and rear surfaces in the figure). A rectangular cylindrical female mold 6 is placed so as to surround the four sides of the mold 5 at predetermined intervals, and in this state is attached to the processed end surface of the container 8 via a holder 7. In this state, an alloy material (billet) 9 mainly made of aluminum is stored in the cavity 8A of the container 8, and is pressed in the direction of the arrow with the stem 10 from the left direction ( _X1 direction) in the illustration of the cavity 8A of the container 8. . At this time, since the billet 9 has been given flexibility by heating (for example, 400°C), it is pushed by the stem 10 and passes between the molds 5 and 6 forward (in the direction of arrow X ₂ in the figure).
pushed out. As a result, blocks 1' having several guide grooves 3 on opposing inner wall surfaces are successively taken out. The block 1' thus obtained is cut into appropriate lengths to obtain the block 1 having an external shape as shown in FIG.

Thereafter, as shown in FIG. 4, the end surfaces of several guide grooves 3 on the opening side are cut while the blocks 1 are arranged long in the lateral direction. The cutting tool used in this case includes the guide groove 3 on the shaft 11A.
Preferably, the cutter 11 includes a plurality of disc-shaped cutting blades 11B attached at intervals of .

If the diameter of the cutting blade 11B of this cutter 11 is made smaller than the inner wall spacing between the upper and lower walls 1D, 1D of the block 1, and the width is made slightly wider than the width of the guide groove 3, The above-mentioned R groove can be easily formed simply by rotating the cutter 11 and bringing it into contact with the open end surface of the block 1.

The above cutting is performed on the inner wall guide groove 3 of one wall surface 1D.
After applying it to wall 1, turn block 1 over and place it on the other wall 1.
This is also applied to the inner wall guide groove 3 of D to obtain an R groove 3A as shown in FIG. This R groove 3A is the guide groove 3
It tapers deeper and wider than the rest of the body.

In addition, if necessary, mark U on the top and bottom of the opening of block 1.
By forming the letter-shaped notches 1B, 1B by cutting or the like, the storage tool shown in FIG. 1 can be obtained.

[Effects of the Invention] According to the present invention detailed above, the following various effects can be obtained.

First, the lead frame storage device is integrally constructed by an extrusion process and is made of an alloy material, resulting in a small and lightweight product. Furthermore, the position of the guide grooves formed on the inner wall surface is also symmetrical, which improves the reliability of the product. Further, since the entrance and exit ends of the guide grooves are gradually deepened and wide toward the end face, insertion and storage of the lead frame is extremely easy, and there is no possibility of clogging or falling out.

Next, during manufacturing, the blocks with guide grooves are made integrally through an extrusion process, which eliminates the need for assembling a pair of blocks and aligning guide grooves, which was required in the past. It is possible to reduce man-hours and speed up work. In particular, when machining the entrance and exit portion of the guide groove, multiple disc-shaped cutters are used to cut the guide groove at the same time, which speeds up the cutting process and improves the uniformity of the finish. It exhibits excellent effects such as being able to secure

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing one embodiment of the lead frame storage device according to the present invention, FIG. 2 is a partially enlarged side view of a guide groove thereof, and FIGS. 3 to 5 are manufacturing of the lead frame storage device. FIG. 3 is a schematic cross-sectional view of the extrusion process, FIG. 4 is a schematic side view of the cutting process, and FIG. 5 is a diagram showing the shape of the guide groove after cutting. FIG. 1... Lead frame storage tool, 1A... Opening, 1B... U-shaped notch, 1D... Wall, 3...
...Guide groove, 3A...R groove, 4...Lead frame, 5...Male mold, 6...Female mold, 7...
...Holder, 8...Container, 9...Billet,
10... Stem, 11... Cutter.

Claims (1)

[Scope of Claims] 1. A rectangular tube-shaped storage device having openings at both ends and a plurality of lead frame storage guide grooves provided on an inner wall surface extending over the openings, wherein the rectangular tube is made of aluminum. The guide groove has a U-shaped cross section, is formed symmetrically on the opposing inner wall surfaces of the rectangular tube, and is deeper and wider at the end surfaces of the openings at both ends than at other parts. A lead frame storage device characterized by a tapered R groove.