JPS583728A - Punch-working method of lap plate - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for punching stacked plates made of a surface material and a base material, and particularly to a method for punching stacked plates in which the punched end surface of the base material is covered with the surface material. It is about the method.

FIG. 1 is a sectional view showing a stacked plate made of a surface material and a base material.

In FIG. 1, 2 is the surface material of a thin plate made of high-grade material (for example, 888304), 3 is the base material of a thick plate (for example, 8FCC), which is a low-grade material, and 1.1 is the surface material 2 of the thin plate. It is made by stacking the base material 3 and the base material 3.

When drilling holes in this stacked board 1, if the electric board 1 is punched out using a normal method, the base material 3 will be exposed at the punched end surface, which will cause problems in terms of corrosion resistance and design.

In order to avoid this, a method is conventionally known in which the cut end surface of the base material 3 is coated with the surface layer material 2. This method is described in the second section.
This will be explained using Figure 3.

Fig. 2.3 explains the prior art, Fig. 2 is a sectional view showing a state in which the surface material is burred, and Fig. 3 is a sectional view of the extracted end surface of the base material by the method according to Fig. 2. FIG. 3 is a cross-sectional view showing a nine-ply board covered with a surface material.

First, holes 3 are punched out only in the base material 3, and holes 2a, which are somewhat smaller than the punched holes 3a in the base material 3, are punched in the surface layer 2 in a separate process. Next, as shown in FIG.
The die 5 has a hole 5m with the same diameter as the diameter of the punched hole 3m, and the thickness of the surface material 2 is determined from the diameter of the punched hole 3a of the base material 3. punch 4 with a diameter twice smaller than
Use K to purl only the surface layer material 2.
As a result, as shown in FIG. 3, one stacked board can be obtained in which the cut-out edges of the base material 3 are coated with the surface layer material 2.

However, in this method, the base material 3 and the surface material 2 are punched out in separate processes, and then the holes 3a and 2m of both are centered, and the holes 3a and 2m of both are aligned and then the purling process is performed. Not only is productivity low (especially when the plate size is large), but the centering accuracy is insufficient.
Since a part of the edge of the base material 3 is exposed, there is a problem in terms of corrosion resistance and design.

The purpose of the present invention is to eliminate the drawbacks of the above-mentioned conventional techniques, and to provide a method for punching stacked plates in which the punched end surface of the base material is coated with a surface layer material, with high productivity and high precision. That is.

A feature of the present invention is that in the method for punching stacked plates made of surface material and base material, pilot holes are punched in advance in the stacked plates, and then a die with sharp holes at the corners and a punch with rounded corners are used. The area around the prepared hole of the stacked plate is placed on the die so that the base material is in contact with the die using a punching burring die having a clearance similar to the thickness of the surface material. The present invention provides a method for punching out stacked plates in which only the base material is punched out and the surface material is coated on the punched end surface.

Hereinafter, the present invention will be described as a surface material (SUS304) with a plate thickness of 0.5-
and plate thickness 13m (D base material (SPCC) stacked plate,
The cut end surface of the base material is coated with the surface layer material, and 923 wm
By the specific example of punching out holes in /, the fourth
This will be explained using Figures 9 to 9.

FIG. 4 is a sectional view showing a stacked plate used for carrying out a stacked plate punching method according to an embodiment of the present invention, and FIG.
FIG. 4 is a sectional view showing the stacked board after punching a pilot hole in the stacked board, FIG. 6 is a sectional view showing the stacked board shown in FIG. Figure 7 is
FIG. 6 is a sectional view showing the state in which the stacked plate in the state shown in FIG. 6 is being processed with a punching burring die; FIG. teeth,
FIG. 9 is an enlarged cross-sectional view showing the details of the vicinity of the section ■ in FIG. 8;

First, a stacked board 1 consisting of a surface material 2 and a base material 3 shown in FIG.
Then, the diameter d s −= l @■f as shown in Fig. 5
Punch out the pilot hole. This punching process can be performed without any problem in the same way as normal punching process by punching with a clearance of about 5% on one side.

Next, place this stacked plate 1 on a die 5A of a punching and burring type (details will be described later) so that the base material 3 side of the plate 1 is in contact with the die 5A (see Fig. 6). Center and set. The centering of the legs can be done using the pilot hole centering method used in normal press working, so it is extremely convenient.

As shown in FIG.
The diameter dH is larger than that of the prepared hole in anticipation of covering the
= 24mm hole x5A and 'p' in the corner
” 2 X t * ” 2 X O, 5” L OW
(However, there is a circle # with t, the plate thickness of the second surface material 2), and the diameter ds = d, -2Xt, : 24-2 Clearance of the same size as plate thickness t, 0.5■
2=(24-23)/2=0.5■).

When this punch 4A of the punch burring type is lowered to process the area around the pilot hole of the stacked plate 1, the seventh
As shown in the figure, the base material 3 is sheared near the sharp corners of the die 5A, while the surface material 2 is not sheared and is deformed close to overhanging because the corners of the punch 4A are rounded. Become. The four punchers pushed in further,
When the indentation amount reaches approximately 1.5cm, shearing of the base material 3 is completed, and after that, only the surface layer material 2 is formed by burring using the punched end surface of the base material 3 as a die, and finally is the 8th
As shown in the figure, the diameter dl that covers the punched end surface of the base material 3 =
Can punch out a 23mm hole. In addition, in the vicinity of the punched end surface, as shown in FIG. 9, the surface material 2 wraps around the convex portion 31 on the punched end surface of the base material 3, so that the effect of fastening the base material 3 and the surface material 2 is also achieved. be.

In this example, r is twice the thickness of the surface layer material 2, that is, one piece, but when r is even larger, for example, 3 sm, a good coated surface can be obtained. However, r,
When r is 0.5 square meters (the same thickness as the surface material 2), partial fracture has occurred, and this degree of r is the minimum r under the present conditions.

According to the nine embodiments described above, with the surface material 2 and the base material 3 stacked together as a pair, it is possible to punch out a pilot hole and punch out the area around the pilot hole. Since positioning of the two plate materials 2 and 3 that was previously performed is no longer necessary, it is possible to perform stacked plate punching with high productivity and accuracy.

As described in detail above, according to the present invention, in the method for punching stacked plates made of surface material and base material, pilot holes are punched in advance in the plate having a patterned shape, and then holes with sharp corners are punched. It is a combination of a die with rounded corners and a punch with rounded corners, and a punching die with a clearance equal to the thickness of the surface material is used so that the base material side is in contact with the die. By processing the periphery of the prepared hole of the stacked plate placed on the plate, only the base material is punched out and the surface material is coated on the punched end surface, resulting in a highly productive and highly accurate base material. It is possible to provide a method for punching a nine-ply board by covering the punched end surface of the material with a surface layer material.

[Brief explanation of the drawing]

Figure ts1 is a sectional view showing a stacked plate made of surface material and base material, Figure 2.3 is for explaining the conventional technology, and Figure 2.
The figure is a cross-sectional view showing the state of burring the surface material.
The figure is a cross-sectional view showing a stacked plate in which the punched end surface of the base material is coated with a surface material by the method shown in FIG. FIG.
Fig. 6 is a sectional view showing the stacked plate according to Fig. 5 set in a punching and paring die, and Fig. 7 is a cross-sectional view showing the stacked plate of shape mK according to Fig. 6 in a punching and paring die. FIG. 8 is a cross-sectional view showing the processed product after the processing is completed; FIG. 9 is an enlarged cross-sectional view showing details of the vicinity of the ■ part in FIG. 8. It is. 1... Stacked board, IB... Stacked board with surface material coated on the cut-out end surface of base material, 2...-Surface material, 3... Base material, 4A
... Punch, 5A... Dice. Agent Patent attorney Kosaku Fukuda (and 1 other person) Yl Mouth 30th 40th $, 5th '4z Koko 7th A Kaya δ Eye 8th De Ref 7th base 3^ 3

Claims (1)

[Claims] 1. In the method of punching stacked boards made of surface material and base material, after punching a pilot hole in the stacked board in advance, punching is performed using a combination of a die with sharp holes at the corners and a punch with rounded corners. B. Machining the periphery of the prepared hole of the stacked plate placed so that the base material side is in contact with the die, using a punching burring die having a clearance comparable to the thickness of the surface material. A method for punching stacked plates, comprising punching out only the base material and punching the punched end face so as to cover the surface layer material.