JPH0220143B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates 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).

[Technical Background of the Invention and Problems Therewith] Conventional storage devices of this type include a mold that is used to obtain a pair of cast metal members (die-casting) with a U-shaped cross section, and then a mold is formed on the inner surface of both U-shaped members. After forming several guide grooves that correspond to each other by cutting, etc., aligning both U-shaped members so that their openings match, and then fixing them by gluing or screwing, etc., to form a corner with openings at both ends. One is known that consists of a cylindrical 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 pasted 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. Furthermore, it is difficult to align the guide grooves, resulting in a decrease in product yield. Further, in the conventional device, since the guide groove is formed to have a uniform depth and width, there was a problem that it was difficult to insert the lead frame and the work could not be performed smoothly.

[Object of the Invention] The present invention has been made in view of the above-mentioned circumstances, and it is possible to smoothly and quickly insert a lead frame, and also to reduce the size and cost of the device.
It is an object of the present invention to provide a lead frame storage device that can reduce and simplify the number of manufacturing steps and provide a highly reliable product.

[Embodiments of the invention] The present invention will be specifically explained below using 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 tool 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). U-shaped notches 1B, 1B are symmetrically provided in the upper and lower parts of the opening, and the inner wall surfaces of the pair of upright walls 1D, 1D are provided along the openings 1A, 1A at both ends. Several guide grooves 3, 3 arranged at mutually corresponding positions on both inner wall surfaces are formed at regular intervals. As shown in FIG. 2, these several guide grooves 3 are formed with tapered R grooves 3A that are deeper and wider than the other portions at the end faces of the openings at both ends of the block 1.

With the above configuration, the elongated lead frame 4 can be easily accommodated by inserting it from the opening side through the symmetrical guide grooves 3, 3. At this time, deep and wide R grooves 3A, 3A are formed on the opening end surfaces of the guide grooves 3, 3.
, the lead frame can be inserted smoothly and will not get caught or fall off at the entrance. Note that the U-shaped notches 1B, 1B are used to avoid getting in the way when using jigs such as sprockets for transporting lead frames, and also function as confirmation windows for visually checking the storage status. However, if it is not necessary to have such a 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 open 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 stem 8, and the stem 8
Press the cavity 8A from the left direction ( _X1 direction) in the direction of the arrow with the stem 10. At this time, since the billet 9 has been made flexible 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.
It 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 is deeper and wider than the rest of the area.

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. Furthermore, the entrance and exit ends of the guide groove are deep,
In addition, since the lead frame is wide, it is extremely easy to insert and store the lead frame, and the lead frame will not become clogged or fall 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 the number of steps and speed up work.
In particular, when machining the entrance and exit portions of guide grooves, a cutter that cuts multiple guide groove sections at once is used, which has advantages such as speeding up the cutting process and ensuring uniform finish. It has a great effect.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram 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 cylinder-shaped block body having openings at both ends is integrally formed, and a pair of opposing inner wall surfaces of this block body are symmetrically provided with several guide grooves extending over the openings at both ends. are formed at predetermined intervals, and notches are symmetrically formed in the vicinity of openings at both ends of a pair of wall surfaces intersecting the opposing inner wall surfaces on which the guide grooves are formed. 2. The lead frame storage device according to claim 1, wherein the guide groove has a tapered groove that is deeper and wider at the end faces of the openings at both ends of the block body than at other parts.