JP2003080323A - Die device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a die device which can dispense with any die blade requiring the machining accuracy of micron unit, shorten the delivery time, reduce the cost, and dispense with any maintenance and adjustment of the clearance accuracy with a punch. SOLUTION: In the die device 1 in which a plate 20 to be punched is held by a stripper 7 on a die 2 side, and the plate 20 is punched by an extending/ retracting punch to manufacture a punched article, an elastic pad 10 of the thickness exceeding the bottom dead center for punching the plate 20 when the punch 6 is extended/retracted to/from the die 2 is arranged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die device for punching a punched plate to obtain a punched product having a predetermined shape.
In particular, the present invention relates to a die device capable of obtaining a punched product without forming a blade on a die.

[0002]

2. Description of the Related Art Generally, as a device for punching a plate to be punched to obtain a punched product having a predetermined shape such as a lead frame or an iron core piece, a die device having a punch and a die is used.

For example, there is the above-mentioned lead frame as an example of a punched product, and in a die device for producing a lead frame, a punched plate is punched using a progressive feed type cemented carbide die.

In the cemented carbide die, the fine shape of the lead frame is formed by punching accurately, so that a blade is formed at each of the tips of the punch and the die.

[0005]

However, it takes a lot of time and cost to form a blade on the tip of the punch and die of the cemented carbide die described above.

That is, the blade formed on the punch and the die is
It is formed using a grinding process or a wire-cut electric discharge machine, but the processing precision requires a finish of micron precision, so the number of man-hours required to manufacture the blade is about 60% of the total manufacturing of die equipment. This has been a major obstacle to short-term delivery and cost reduction of die equipment or punched products.

[0007] Further, in a punched product obtained by a die device, for example, the above-mentioned lead frame, the punched dimension is the product dimension as it is, and therefore the punch blade is required to have a micron-precision finishing dimension. Since not only the blade but also the die blade affect punching burrs and the like, the clearance with the punch blade must be accurately maintained. Therefore, similarly, a finish dimension with micron accuracy is required.

Further, the present invention, which requires a high degree of skill to adjust the position between the die blade and the punch blade, and to re-polish the die blade and the punch blade after a predetermined period of time or a predetermined number of punching operations, is required. In view of the above circumstances, a die device that does not require a die tool that requires micron-precision machining accuracy, and that can achieve a short delivery time and low cost, and that does not require maintenance and adjustment of clearance accuracy with a punch is also provided. The purpose is to

[0009]

In order to solve the above problems, in the present invention, a punched product is manufactured by pressing a punched plate to the die side with a stripper and punching the punched plate with a retractable punch. In the die apparatus, the die is not provided with a die blade that moves the punch forwards and backwards, and when the punch is forwards and backwards, the punching plate is punched on the die. An elastic rug with a thickness exceeding the dead point is arranged.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a mold apparatus according to the present invention will be described in detail below.

FIG. 1 is a conceptual sectional view showing an embodiment of a mold apparatus 1 according to the present invention.

The mold apparatus 1 comprises a lower mold (die) 2 and an upper mold 3 which is disposed above and facing the lower mold 2. The upper mold 3 is an upper surface of the lower mold 2. Guide 4 erected on
It is movably supported up and down via.

On the other hand, the upper surface 2 of the lower die 2 described above.
A plate-shaped flat plate 5 is embedded in a, and its upper surface 5a is flush with the upper surface 2a of the die 2. This plate-shaped flat plate 5
Is made of heat-treated wear-resistant steel, steel alloy, or super-steel alloy, which enhances the wear resistance of the upper surface of the die and supports the elastic rug described later with strong rigidity.

On the other hand, the flat plate 5 of the die 2 is provided on the upper mold 3 described above.
A plurality of punches 6 are embedded in the lower surface side 3a at a predetermined pitch, and the tip end portion 6a is fitted into a fitting insertion hole 7a of a stripper 7 which is movably supported vertically through a guide 4. There is.

A punch blade (not shown) is formed on each tip 6b of the punch 6 with a processing accuracy of micron accuracy.

On the other hand, the flat plate 5 arranged on the die 2 described above.
An endless elastic rug 10 having a belt shape is stretched over a plurality of conveying rollers 11 on the upper surface of the.

The elastic rug 10 is made of rubber, which is an elastic material.
It is made of synthetic resin or a combination thereof.

On the upper surface of the elastic rug 10, in order to manufacture a punch-molded product such as a lead frame,
A strip-shaped punched plate 20 is arranged.

Next, the operation of the mold apparatus 1 described above will be explained.
The configuration will also be described in more detail. A belt-shaped punched plate 20 is conveyed by an unillustrated feeding device as shown by an arrow A in FIG. When it is conveyed and stopped at a predetermined position on the upper surface of the flat plate 5, the stripper 7 descends from the initial position of FIG. 1 through the guide 4 as shown in FIG. The plate 20 is positioned and gripped between the stripper 7 and the elastic rug 10.

In this way, after the punched plate 20 is positioned and gripped between the stripper 7 and the elastic rug 10,
As shown in FIG. 3, the upper die 3 is lowered from the initial position of FIG. 1, whereby the tip 6b of the punch 6 supported by the upper die 3 is supported.
When is lowered to the bottom dead center, the tip 6b of the punch 6 enters below the upper surface of the elastic rug 10 and punches the punched plate 20 with high precision along the shape of the punch 6. In order to prevent the tip 6b of the punch 6 from coming into contact with the flat plate 5 when the tip 6b of the punch 6 descends to the bottom dead center, the thickness of the elastic rug 10 is set such that the tip 6b of the punch 6 is punched out. It goes without saying that the thickness is set to exceed the bottom dead center when punching the plate 20.

In this way, the tip 6b of the punch 6 enters under the upper surface of the elastic rug 10 and after punching the punched plate 20 in a good shape in accordance with the shape of the punch 6, as shown in FIG. When the die 3 is moved upward to the initial position, the punched product 30 such as a lead frame is accurately formed on the punched plate 20. Further, the punched dust is captured by the elastic rug 10.

Then, the belt-shaped punched plate 20 is again conveyed by a predetermined distance in the direction indicated by the arrow A in FIG. 1 by a feeding device (not shown), and the elastic rug 10 is moved by the conveyance roller 11 by a predetermined distance as indicated by the arrow B. When conveyed, punched products 30 are continuously obtained from the punched plate 20 by the punch 6 again.

On the other hand, as shown in FIG. 5 which is a fragmentary cross-sectional view of FIG. 3, punching residue 20a of the punched plate 20 generated after punching the punched plate 20 along the shape of the punch 6 is shown.
Is adhered to the elastic rug 10 as it is, the elastic rug 10 is bent downward by the conveying roller 11 (FIG. 1) on the exit side of the mold apparatus 1 as indicated by an arrow B, and is conveyed to and from the flat plate 5. If it is retracted, it can be easily removed from the inside of the elastic rug 10, so that no scrap rises.

In the above embodiment, the elastic rug 10 is formed in the shape of an endless belt and is stretched via the plurality of conveying rollers 11. However, the present invention is limited to the above embodiment. Elastic rug 10 simply formed in a strip shape without
May be movably arranged on the upper surface of the flat plate 5 of the die 2.

In the above embodiment, the mold apparatus 1 having a plurality of punches 6 has been described, but the invention can be applied to a mold apparatus having a single punch 6.

[0026]

As described above, according to the mold apparatus of the present invention, when the punch advances and retreats on the die, the elastic rug having a thickness exceeding the bottom dead center for punching the plate to be punched is arranged. , When the tip of the punch tries to enter below the surface of the elastic rug, the punched plate can be punched accurately along the shape of the punch to obtain a punched product with a fine shape. Since there is no need for a manufacturing process to form a high-precision die blade that requires micron precision for punching in and out, it is possible to shorten the delivery time of die equipment and punched products, lower the price, and maintain and adjust the clearance precision with the punch. It is possible to provide a mold device that does not require.

Further, since the elastic rug is arranged in a strip form so as to be movable on the upper surface of the die, the scraps of the punched plate adhering to the elastic rug are internally contained in the elastic rug.
If this elastic rug is moved from the upper surface of the die, it can be easily removed from the inside of the mold without causing scraps.

Further, when the elastic rug is made of rubber such as urethane rubber, synthetic resin, or a combination thereof, the punchability of the punched plate by the punch can be further improved.

[0029]

[Brief description of drawings]

FIG. 1 is a conceptual cross-sectional view of a mold device according to the present invention.

FIG. 2 is a conceptual cross-sectional view showing the operation of the mold device according to the present invention.

FIG. 3 is a conceptual cross-sectional view showing the operation of the mold device according to the present invention.

FIG. 4 is a conceptual cross-sectional view showing the operation of the mold device according to the present invention.

5 is an enlarged view of a main part of FIG.

[Explanation of symbols]

1 ... Mold device 2 ... die 5 ... flat plate 6 ... punch 7 ... Stripper 10 ... Elastic rug 20 ... Punched plate

Claims (4)

[Claims] 1. A die apparatus in which a punched plate is pressed to a die side by a stripper, and a punch capable of advancing and retreating is used to punch a punched plate to produce a punched product. Is equipped with an elastic rug having a thickness exceeding the bottom dead center for punching the punched plate when the punch moves forward and backward, without providing a die blade that moves forward and backward. And mold equipment. 2. The elastic rug is a belt-like member, and is movably arranged on the upper surface of the die.
Mold device according to. 3. The mold apparatus according to claim 1, wherein the elastic rug is made of rubber, synthetic resin, or a combination thereof. 4. A flat plate of heat-treated wear-resistant steel, steel alloy, or super-steel alloy is arranged on the upper surface of the die where the punch advances and retracts. Mold device according to.