JP2522417Y2 - Progressive die structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention is intended to prevent a warp of a stripper by efficiently transmitting a pressing force to a stripper for performing a press at the time of a fine press working on a thin member such as a lead frame. The present invention relates to a progressive die structure that can be used.

[0002]

2. Description of the Related Art Recently, printed wiring boards and the like on which semiconductor integrated circuits and the like are mounted have been designed to have high density and high mounting. For this reason, thinner members with more miniaturized lead frames etc. have been adopted, and in order to ensure the reliability of the finished product, finer press working with even higher precision is required when pressing. Has been requested.

[0003] A progressive die as shown in FIG. 2 is generally used as a metal press die for press-working a thinned member as described above.

[0004] The schematic configuration of this progressive die will be described.
A stripper holder 3 is attached to an upper sub 2 on the upper die 1 side of the mold, and a stripper plate 4 is attached to the stripper holder 3. As the stripper plate 4, as shown in FIG. 3, each of the cutting stages 4a, 4b,... Are arranged at predetermined intervals, and as a whole, a so-called integral structure or a structure similar thereto is used.

[0005] A die plate 8 is attached to the lower die 5 via a lower packing plate 7 as a floor plate on the lower sub 6. 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 figure, a coil-shaped press-cut material 1 to be a product.
3 are inserted from the inlet end of the upper mold 1 and the lower mold 5 to the outlet end (in the direction of the arrow in the figure), and are sequentially fed to each of the punching stages 4 sequentially.
a, 4b,... are punched by press working to obtain a finished processed product.

Next, a state of the press working by such a die will be described with reference to FIG. 4 which is a schematic sectional view when viewed from the direction of arrow A in FIG. The stripper plate 4 provided with each of the punching stages 4a, 4b,...
Are pressed directly by the strippers 9, 9,... Sequentially in contact with the die plate 8 on the lower die 5 side.

Further, a pressing mechanism 10 is provided on the upper die 1 side to apply a pressing force to each of the strippers 9, 9,. The pressing mechanism 10 includes a spring 11 provided on the upper sub 2 as a pressing force generating means, and a connecting rod 12 for transmitting the pressing force. The pressing force generating means may be a hydraulic means or the like in addition to the illustrated spring 11.

The punched material 13 pressed by the stripper 9 is punched by a punch 14 inserted into the punched holes 8a, 7a of the die plate 8 and the lower packing plate 7.

[0009]

However, in such a conventional progressive die, when the stripper 9 is pressed against the press punching material 13 to perform punching by press working,
In particular, when the press punching material 13 requires fine press processing such as a lead frame, it is important that the pressing force from the pressing mechanism 10 works efficiently on the required portion of the stripper 9. If this is neglected, the horizontal movement, the vertical movement, and the torsion movement (flexion) of the pressed material 13 are performed.
And so on, resulting in a defective product.

However, in the conventional progressive die, the stripper holder 3 is made of steel with a thickness of about 20 to 30 mm, and the stripper 9 is about 5 to 10 m thick.
It is formed as a thin plate made of cemented carbide or steel of about m. Therefore, when the pressing force from each pressing mechanism 10 is transmitted to each stripper 9 via the corresponding connecting rod 12 and the corresponding stripper holder 3, if the transmitting position of the pressing force is far away, the stripper holder 3 is transmitted to each stripper 9 and stripper 9
Warpage occurs, and a portion where the press punching material 13 cannot be pressed occurs, and twisting or shifting occurs in quality.

The present invention has been made in view of such circumstances, and a purpose of the present invention is to efficiently transmit a pressing force to a stripper when performing fine press working of a press punched material. An object of the present invention is to provide a progressive die that can prevent a stripper from warping.

[0012]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a stripper in which a stripper holder is mounted on an upper mold side and a plurality of strippers each provided with a cutting stage such as a lead frame. A progressive feeder in which the plate is attached to the stripper holder, and the press-cut material inserted between the lower die and each stripper is pressed by a pressing mechanism such as a spring structure provided on the upper die to sequentially press the strippers. In the mold
The pressing force at the time of the press working is transmitted to the corresponding stripper via each pressing plate made of cemented carbide .

Each pressing plate made of a cemented carbide is brought into contact with the lower end of any number of connecting rods connected to the corresponding pressing mechanism.

[0014]

According to the present invention, the pressing force from the pressing mechanism at the time of press working is equally transmitted to each stripper via the pressing plate made of a cemented carbide , thereby preventing each stripper from warping.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. The basic configuration of the progressive die used in the present invention is substantially the same as that used in the related art, and therefore, the description will be made using the names and reference numerals shown in the conventional example.

A stripper holder 3 is attached to an upper sub 2 on the upper die 1 side of the mold, and a stripper plate 4 is attached to the stripper holder 3. As the stripper plate 4, as shown in FIG. 3, the punching stages 4a, 4b,... Are arranged at predetermined intervals, and as a whole, a so-called integral structure or a structure similar thereto.

On the lower die 5 side, a die plate 8 is mounted on a lower sub 6 via a lower packing plate 7 as a floor plate. Then, between the stripper plate 4 on the upper mold 1 side and the die plate 8 on the lower mold 5 side, a coil-shaped press-cut material 13 as a product is supplied from the entrance ends of the upper mold 1 and the lower mold 5. The sheet is inserted into the outlet end, is sequentially fed, and is sequentially punched by pressing each of the punching stages to obtain a finished product such as a lead frame.

The stripper plate 4 provided with each of the punching stages for punching the lead frame or the like is attached to the stripper holder 3 and is inserted into the die plate 8 on the lower die 5 side.
3 are sequentially pressed directly by the strippers 9, 9,....

In order to apply a pressing force to each of the strippers 9, 9,...
0, the pressing mechanism 10 includes a spring 11 provided as a pressing force generating means provided on the upper sub 2,
It is constituted by an arbitrary number of connecting rods 12 transmitting this pressing force. The pressing force generating means may be a hydraulic means or the like in addition to the illustrated spring 11.

The stamping material 13 is punched by punching holes 8a, 8a in the die plate 8 and the lower packing plate 7.
This is performed by a punch 14 inserted through 7a.

On the other hand, reference numeral 15 denotes a pressing plate made of a wear-resistant cemented carbide such as V3 or V4. The pressing force from each pressing mechanism 10 at the time of press working is applied to each stripper via this pressing plate 15. 9, 9, ... are transmitted. This pressing plate 15
Usually formed as a thin plate with a thickness of about 10 mm,
Each end of an arbitrary number of connecting rods 12 attached to the upper surface of the stripper holder 3 and transmitting the pressing force of the pressing mechanism 10 is configured to press the pressing plate 15.

[0022] Thus, according to this embodiment, the pressing force from the pressing mechanism 10 during press working, cemented carbide
Through each of the pressing plates 15, 15 made of gold, transmitted to the stripper holder 3, the corresponding stripper 9,9, since it is transmitted ..., each pressing plate 1
Due to the rigidity of the pressure plate 5, even if the pressure plate 1 is a thin plate,
5 is evenly distributed over the entire area of each pressing plate 15. For this reason, even when the stripper 9 is made of a cemented carbide or steel thin plate having a thickness of about 5 to 10 mm as in the conventional case, it is possible to efficiently apply a pressing force to each stripper 9, 9 to prevent warpage.

Each pressing plate 15 is in contact with the lower end of an arbitrary number of connecting rods connected to the pressing mechanism 10, and the pressing force of the pressing mechanism 10 is transmitted via the connecting rod 12 to each pressing plate 15. It is transmitted to the plate 15 to prevent the stripper holder 3 from warping, and applies an even pressing force to each stripper 9.

[0024]

[Effects of the Invention] As described above, according to the present invention,
The pressing force from each pressing mechanism at the time of press working is efficiently transmitted to the entire area of the corresponding stripper, and the warpage of each stripper can be prevented to perform high-precision fine press working.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view illustrating a progressive die according to the present invention during press working.

FIG. 2 is a schematic side view showing a basic configuration of a conventional progressive die.

FIG. 3 is a plan view showing an example of a stripper plate used for a conventional mold.

FIG. 4 is a schematic sectional view when viewed from the direction of arrow A in FIG. 2;

[Explanation of symbols]

 9 stripper 10 pressing mechanism 15 pressing plate

Claims (2)

(57) [Scope of request for utility model registration] 1. A stripper holder having a plurality of strippers, each provided with a pull-out stage such as a lead frame, is attached to the upper mold side, is attached to the stripper holder, and is inserted between the stripper holder and the lower mold. In a progressive die, in which each stripper is pressed by pressing each stripper by a pressing mechanism such as a spring structure provided on the upper mold side, the pressing force at the time of the pressing is made of a cemented carbide. A progressive die structure characterized in that each of them is transmitted to a corresponding stripper via a pressing plate. 2. The progressive die according to claim 1, wherein each pressing plate made of a cemented carbide is brought into contact with a lower end of an arbitrary number of connecting rods connected to the corresponding pressing mechanism. Construction.