JPH0715198U - Progressive die structure - Google Patents

Abstract

(57) [Abstract] [Purpose] When performing fine press working of press-cut materials, high-precision fine press working is performed at low cost. [Structure] A surrounding area of a punching hole 9a formed as a punching shape in a stripper 9 is provided corresponding to a portion where a pressing force needs to be applied to a press punching material 13, and a flat surface in which the punching hole 9a is opened. The pressing convex portion 16 having 16a is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a progressive feed which receives a pressing force applied to a press-cut material at a portion requiring a fine-press work on a press-cut material in a thin member such as a lead frame, and performs a highly accurate micro-press work at low cost. It concerns the type structure.

[0002]

[Prior art]

 Recently, printed wiring boards and other devices that incorporate semiconductor integrated circuits have been designed for higher density and higher packaging. For this reason, thin materials with finer lead frames have been adopted, and in order to ensure the reliability of the finished product, the press processing requires even higher precision. Is required.

As a metal-pressing die for press-working such a miniaturized thin member, a progressive die as shown in FIG. 5 is generally used. The schematic structure of the mold will be described.

A stripper holder 3 is attached to the upper sub 2 on the upper die 1 side of the die, and a stripper plate 4 is attached to the stripper holder 3. As shown in FIG. 6, as the stripper plate 4, stripping stages 4a, 4b, ... Are arranged at predetermined intervals on the strippers 9, 9 ,. It is an expression or a structure close to it.

On the lower die 5 side, a die plate 8 is attached on the lower sub 6 via a lower packing plate 7 which is a floor plate. Then, between the stripper plate 4 on the upper die 1 side and the die plate 8 on the lower die 5 side, as shown by a dotted line in the drawing, a coiled press-cut material 13 to be a product is provided. And the lower die 5 are inserted from the inlet end to the outlet end (in the direction of the arrow in the figure), and are sequentially fed to perform punching by press working of the respective punching stages 4a, 4b ,. We have obtained processed products of such thin materials.

At the time of punching by press working, each stripper 9 provided with each punching stage 4 a, 4 b, etc. for working a lead frame and the like is provided with a spring 11 as a pressing force generating means provided on the upper sub 2. The pressing mechanism 10 constituted by the connecting rod 12 which transmits the pressing force presses each stripper 9, and the press-extracting material 13 is inserted into the extraction hole 9a of the stripper 9 and the extraction hole 8a of the die plate 8. It is punched by the punch 14 (see FIG. 8).

[0007]

[Problems to be solved by the device]

 By the way, in such a conventional progressive die, when the stripper 9 is pressed against the press-cutting material 13 to perform punching by press working, the press-cutting material 13 particularly requires fine press working such as a lead frame. In such a case, it is difficult to secure a predetermined accuracy because the press-extruded material 13 moves in a horizontal direction, an up-down direction, or a twisting direction, that is, warpage or deflection occurs.

For this reason, post-processing such as heat treatment or hitting is required after the press working, but the cost increases if such a process is required.

Further, as shown in FIG. 7, a method has also been proposed in which a convex portion 15 is provided along the edge of the punched hole 9a to prevent warping, blurring, etc. of the stamping material 13 and improve working accuracy. However, it is very expensive to manufacture the convex portion 15 having a shape along the edge of the fine hole 9a.

The present invention has been made in view of such circumstances, and an object of the present invention is to perform highly precise fine press working at low cost when performing fine press working of a press-cut material. Providing a progressive die structure to do.

[0011]

Means for Solving the Problems In order to achieve such an object, the present invention inserts a press-cutting material between a stripper plate on the upper die side and a die plate on the lower die side, and press-presses the material. In a progressive die in which a material is pressed to punch a thin material such as a lead frame, and fine pressing is performed, the area surrounding the punched hole formed as a punched shape on the die side is the pressing force applied to the punched material. It is characterized in that it is formed as a pressing convex portion having a flat surface provided corresponding to a portion where it is necessary to add and having a punched hole.

The pressing convex portion can be provided at a portion where the upper die side stripper plate needs to apply a pressing force to the press-cutting material, and the lower die side die plate presses the pressing-out material. You may provide in the part which needs to add. Further, the pressing convex portion may be provided at a portion where both the upper mold side stripper plate and the lower mold side die plate need to apply a pressing force to the press-cut material.

[0013]

[Action]

 According to the present invention, in the press punching material at the time of press working, the pressing convex portion on the die side is joined to the area requiring the punching processing, and the other portion has a step with the pressing convex portion. In the formed space, the pressed state is released. Therefore, the pressing force applied to the press-cut material can be released in this area of the space, so that the press-cut material can be easily prevented from warping or blurring, and high-precision fine press processing can be performed at low cost. You can do it.

[0014]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. Since the basic structure of the progressive die used in the present invention is almost the same as that of the conventional example, those shown in FIG.

A stripper holder 3 is attached to the upper sub 2 on the upper die 1 side of the die, and a stripper plate 4 is attached to the stripper holder 3. As shown in FIG. 6, the stripper plate 4 has stripping stages 4a, 4b, ... Arranged at predetermined intervals on each stripper 9, 9 ,. The structure is similar to that.

On the lower die 5 side, a die plate 8 is attached on the lower sub 6 via a lower packing plate 7 which is a floor plate. Then, between the stripper plate 4 on the upper die 1 side and the die plate 8 on the lower die 5 side, as shown by a dotted line in the drawing, a coiled press-cut material 13 to be a product is provided. And the lower die 5 are inserted from the inlet end to the outlet end (in the direction of the arrow in the figure), and are sequentially fed to perform punching by press working of the respective punching stages 4a, 4b ,. We have obtained processed products of such thin materials.

At the time of punching by press working, each stripper 9 provided with each punching stage 4a, 4b, ... Such as a lead frame is provided with a spring 11 as a pressing force generating means provided in the upper sub 2 and A pressing mechanism 10 composed of a connecting rod 12 that transmits a pressing force presses each stripper 9, and the press-cutting material 13 is inserted into the hole 9a of the stripper 9 and the hole 8a of the die plate 8. It is punched by the punch 14 (see FIG. 8). The pressing force generating means may be a hydraulic type other than the spring 11 shown.

On the other hand, as shown in FIG. 1 and FIG. 2, each stripper 9 (on the stripper plate 4 side) of the upper die 1 in the die is provided with a surrounding area of a punching hole 9a formed as a punching shape. The pressing convex portion 16 having the flat surface 16a in which the hole 9a is formed is formed, and the remaining area other than the pressing convex portion 16 is formed with a space portion 17 by the pressing convex portion 16 and the step 16b. .

As shown in FIG. 2, the flat surface 16a of the pressing convex portion 16, that is, the surrounding area (S ₁ ) of the punch hole 9a is, for example, X with respect to the widths x and y of the punch hole 9a. = X + 15 mm, and Y = y + 15 mm.

Therefore, when the pressing convex portion 16 is not provided and the pressing is performed with the area (S) of the entire surface which is flat as in the conventional case, the pressing force per unit area is S> S ₁ . Therefore, in the present invention, the pressing force is strongly received, and the desired highly accurate press working can be performed.

Further, the pressing convex portion 16 and the space portion 17 may be provided on the die plate 8 of the lower mold 5 as shown in FIG. 3, or as shown in FIG. It may be provided both on the board 8 and the board 8.

The stripper holder 3 to which the stripper plate 4 is attached is formed of a cemented carbide material, or is constructed such that a cemented carbide plate formed of a cemented carbide material is attached thereto. The rigidity of may be increased.

As described above, according to this embodiment, in the press punching material 13 at the time of press working, the flat surface 16a of the pressing convex portion 16 on the die side is joined to the region requiring the punching work, and The portion is released from the pressed state in the space portion 17 formed by the pressing convex portion 16 and the step 16b, and the pressing force can be released. Therefore, in the space 17, it is possible to easily prevent the press-cut material 13 from warping, blurring, and the like, and perform highly accurate fine press working.

Further, since it is not necessary to provide the projection 15 along the hole 9a formed in the stripper 9 as a fine shape as in the conventional case, the cost can be reduced.

[0025]

[Effect of device]

 As described above, according to the present invention, the press punching material at the time of press working is pushed by the pressing convex portion on the die side at the portion requiring punching, so that the pressing force is stronger than the conventional one. Can be received.

Further, the other part of the press-cut material is released from the pressed state in the space formed by the step with the pressing protrusion. Therefore, the pressing force applied to the press-cut material can be released in this area of the space, so that the press-cut material can be easily prevented from warping or blurring, and high-precision fine press processing can be performed at low cost. Can be done.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment according to the present invention.

FIG. 2 is a plan view showing the stripper in FIG.

FIG. 3 is a sectional view showing a second embodiment according to the present invention.

FIG. 4 is a sectional view showing a third embodiment according to the present invention.

FIG. 5 is a side view showing the basic structure of a conventional progressive die.

FIG. 6 is a plan view showing an example of a stripper plate used in the mold of FIG.

FIG. 7 is a plan view showing an example in which a protrusion is provided in a hole of a conventional stripper.

FIG. 8 is a cross-sectional view showing a punching process in the case of FIG.

[Explanation of symbols]

 9 Stripper 9a Vent hole 13 Pressed material 16 Pressing convex part 16a Flat surface

Claims (4)

[Scope of utility model registration request] 1. A press-cutting material is inserted between a stripper plate on the upper mold side and a die plate on the lower mold side, and the press-cutting material is pressed to punch a thin member such as a lead frame, and a fine press is performed. In the progressive die for processing, the surrounding area of the punched hole formed as a punched shape on the die side is provided corresponding to the site where pressing force needs to be applied to the punched material, and the punched hole is opened. A progressive die structure characterized by being formed as a pressing convex portion having a flat surface. 2. The progressive die structure according to claim 1, wherein the pressing convex portion is provided at a portion where the stripper plate on the upper die side needs to apply a pressing force to the stamping material. 3. The progressive die structure according to claim 1, wherein the pressing convex portion is provided at a portion where the die plate on the lower die side needs to apply a pressing force to the press-cut material. 4. The pressing convex portion is provided at a portion where both the upper die side stripper plate and the lower die side die plate need to apply a pressing force to the press-cut material. The progressive die structure described.