JPH0418931B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to the configuration of a press mold having a large number of processing parts such as cutting and bending.

Structure of a conventional example and its problems FIG. 1 shows a conventional product having multiple pieces cut and bent. As shown in FIG. 2, this mold has a punch 2 for processing a material 1, a stripper 5 having bitter holes 3 and 4 of the punch 2, and a punch plate having a holding hole 6 for holding the punch 2. 7 and a die 9 having a machining hole 8 with a certain clearance with respect to the punch shape.
0 and a holding shaft part 11 that holds the punch 2 on the punch plate 2 so that it does not fall out of the mold, and the punch plate holding hole 6 is press-fitted with a diameter of about 0 to 0.01 smaller than the punch holding shaft 11. The mold has a hole and a key 12 is fixed thereto to prevent the punch 2 from rotating.

In such a configuration, as shown in FIG.
However, warpage occurs and product accuracy cannot be ensured.

In addition, as shown in FIG. 4, the stripper 15
And since the die 16 has many irregularly shaped holes,
A large amount of time is consumed in manufacturing the stripper and die parts. There were also problems in mold assembly, such as directional press-fitting when attaching the punch, fixing the key, and aligning the blades of the punch and die, which required a lot of time.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and its effects can be expected.

Structure of the Invention The present invention provides a punch for processing a material, a stripper having a guide hole for guiding the punch, a punch plate having a holding hole for holding the punch, and a processed hole having a certain clearance with respect to the punched shape. A mold consisting of a die having a
The shape of the stripper guide hole and the die processing hole are the same size, and the punch has a tip part for processing the material, a guide shaft part for determining the position of the punch itself with the stripper guide hole, and a die processing hole. It consists of a holding shaft part that is held on the punch plate to prevent it from coming off, and the guide shaft and stripper guide hole have an appropriate guide clearance of, for example, 0.03 mm or less, and
The punch holding shaft and the punch plate holding hole have a mutual gap that is larger than the guide gap, which greatly reduces parts manufacturing time, and is extremely advantageous in terms of product accuracy and assembly as a whole.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 6 and 7. Figure 6 shows the state before processing, and Figure 7 shows the state before processing.
The figure shows the state during processing.

In FIG. 6, the punch 18, which is attached to the punch plate 22 without being press-fitted but with a constant clearance, is being guided by the guide hole 19 of the stripper plate 20 while the punch 18 is attached to the die 22.
4 into the processing hole 23, and the material 17 is processed.

Note that the punch is always guided by the stripper's guide hole before and after processing, so
The punch itself does not rotate; processing is performed.

In addition, in FIG. 7, the punch 18 is provided with a step 30 equivalent to the shear clearance and a step 31 equivalent to the material plate thickness, so the punch guide hole 19 of the stripper 20 and the machined hole 23 of the die 24 have the same dimensions. There is.

Therefore, as shown in FIG. 8, the punch guide hole 19 of the stripper 20 and the machined hole 23 of the die 24 can be simultaneously machined by wire cut electric discharge.

Effects of the invention (1) Since the punch is attached to the punch plate with a gap maintained instead of being press-fitted, warping of the punch plate is eliminated.

(2) Because the punch is guided by the stripper,
It is no longer necessary to use a key to prevent rotation.

(3) In manufacturing the stripper and die, simultaneous machining using wire cut electric discharge can be performed, resulting in a significant reduction in manufacturing time.

(4) It has become easier to match the punch and die blades. In addition, overall, it is extremely advantageous in terms of product accuracy and assembly.

Note that the present invention is applicable not only to cutting and bending processing, but also to
Another feature is that it can be applied to square hole drilling and irregularly shaped holes.

[Brief explanation of drawings]

Figures 1a and b are perspective views of examples of cutting and bending products; Figure 2 is a sectional view of a conventional cutting and bending mold;
FIG. 3 is a partial cross-sectional view showing warping of the punch plate due to the conventional punch fixing method, FIG. 4 a and b are plan views of the conventional stripper and die, and FIG. FIG. 6 is an enlarged cross-sectional view of a cutting and bending mold according to an embodiment of the present invention, and FIG. 7 is a cross-sectional view of a cutting and bending mold according to an embodiment of the present invention. FIG. 8 is an enlarged cross-sectional view during machining, and is a cross-sectional view showing simultaneous machining of the stripper and die by wire-cut electric discharge. 2, 11, 13, 18... punch, 7, 14,
22...Punch plate, 12...Key, 5,1
5, 20... stripper, 9, 16, 24...
Die, 1, 17... Material, 3, 4... Gap between punch and stripper, 21... Punch plate holding hole, 10, 25... Machining tip of punch, 19
...Stripper guide hole, 26...Punch guide shaft, 27...Punch holding shaft, 8,2
3, 35, 43, 49...Die processing hole, 28...
... Stripper guide clearance, 6, 29 ... Clearance between punch holding shaft and punch plate holding hole, 3
0...Step equivalent to shear clearance, 31...
Step equivalent to the thickness of the material plate, 32... Wire for wire cut electric discharge processing.

Claims (1)

[Claims] 1 A punch for processing a material, a stripper having a guide hole for guiding the punch, a punch plate having a holding hole for holding the punch, and a die having a processing hole with a certain clearance with respect to the punched shape. The guide hole of the stripper and the processed hole of the die have the same shape, and the punch has a tip for processing the material and a hole for determining the position of the punch itself with the stripper guide hole. It consists of a guide shaft and a holding shaft for holding the punch on the punch plate so that the punch does not fall out of the mold, and has a guide gap between the guide shaft and the stripper guide hole, and
The mold has a gap larger than the guide gap between the punch holding shaft and the punch plate holding hole.