JPS6035213B2 - Hole punching method using a press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for punching a hole by applying a pre-strain in bending using a press.

Conventionally, pre-straining for bending has been carried out using a bending die with a fixed shape as shown in FIG.

However, in the case of short materials as shown in the figure, even if there is some variation in material or dimensions, the effect on the overall bending is small.
Therefore, there was no problem with the press working itself. However, when punching a material of good size, variations in the bending of individual punched parts due to variations in the material gradually accumulate, resulting in a considerable bend as a whole.

Therefore, it not only exceeds the allowable accuracy of the product, but also poses a problem in the pressing operation itself, such as conveying the material, and prevents the application of the punching method by applying bending pre-strain in the mold to long pieces. . An object of the present invention is to eliminate the drawbacks of the prior art and provide a method for punching holes using a press, which automatically controls and minimizes bending due to variations in material, dimensions, etc. during pre-straining bending of a long material. There is a particular thing. That is, in the case of a long material, the present invention first performs punching using the amount of bending pre-strain obtained in an experiment using a short material, and after punching to an appropriate length, a detection device is installed in a press mold or in a conveyance facility. This method is characterized by detecting bending in the mold and automatically controlling the amount of pre-strain for bending in the mold according to the detection result. The present invention will be specifically described below based on embodiments shown in the drawings.

FIG. 1 shows an embodiment of a press for carrying out the punching method using a press according to the present invention.

As shown in the figure, pre-straining of the long strip material 8 for bending is performed between the movable restraint plate 1, the bending amount adjustment punch 2, and the fixed side restraint plate 6 attached to the fixed side restraint plate base 7. . Note that the compression spring 4 is provided between the movable side restraining plate 1 and the bending amount adjusting punch 2. Although not shown, a bending detection mechanism is provided on the feeding direction side of the long strip material 8. The piston rod 11, which is the output of the hydraulic cylinder, is attached to the fixed block 12 and is connected to the movable restraint plate base 5, so that the strip material 8 is bent. In the example, the width is 3, the thickness is 8, and the length is 8.
A case will be described in which a row of long holes with width 5 and length 30 are punched in a line as shown in the figure in the longest copper band plate material 8 on the 000 side. First, an experiment was conducted using a short material with a length of 500 legs to determine the amount of pre-strain bending. The results are shown in Figure 2. Next, the wedge feeding mechanism 9 feed screw 13 and the bending weight adjustment wedge 3 are moved, and the bending amount adjusting punch 2 is moved so that the bending amount determined by the experiment is applied to the long strip material 8. . In this state, pre-strain for bending (6t ribs) is applied to the long strip material 8, and when about 500 ribs have been punched out, the processing is stopped and the amount of bending of the punched part (16 skins or 16 ribs) is measured. To detect. The bending amount adjusting wedge 3 is adjusted in accordance with this detected value (16 side or 16 side) to correct and increase or decrease the bending amount (Δ6[). The control method is to approximate the experimental results shown in Fig. 2 with a straight line, that is, to find the relationship between the amount of bending in the mold and the amount of bending after punching, and to store the equation outside the microconview. When the detected value is bent 6 times in one direction, the amount of push correction of the wedge 3 for adjusting the amount of bending is calculated to make the amount of bending (△6t) 6 times in the opposite direction. Let's do it. By correcting and adjusting the amount of pre-strain for bending in this way, even if the material or dimensions of the long strip material vary, it is possible to punch out the largest holes that are biased to one side one after another in a straight manner. becomes. Note that if the curvature cannot be removed with one correction, the curvature can be brought to zero by correcting it again. As explained above, according to the present invention, by adjusting the amount of pre-strain for bending, it is possible to minimize large variations in overall bending due to variations in material quality or dimensions of the material, and even for the longest material. It is possible to apply a pre-strain of bending inside the hole and punch it out.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of an apparatus for carrying out the punching method using a press according to the present invention, and FIG. 2 is a diagram showing experimental results for determining the amount of pre-strain for bending a long material. . Explanation of symbols, 1...Moving side restraint plate, 2...
Bending amount adjustment punch, 3...Wedge for bending amount adjustment, 4...Compression spring, 5...Moving side restraint plate base, 6...Fixed side Restraint plate, 7...
・Fixed side restraint plate base, 8...Length band plate material,
9...Wedge feeding mechanism, 10...Hydraulic cylinder, 11...Piston rod, 12...
...Fixed block, 13...Feed screw.

Claims (1)

[Claims] 1. In the opposite direction to the bending that occurs in the board width direction due to the hole punching process, bend the vicinity of both ends of the hole to apply appropriate bending pre-strain to prevent the board width ends from bulging due to the board width restraining member. Press holes are punched out at predetermined intervals in the longitudinal direction of a long strip of restrained material, and then the amount of bending is detected at the point where the predetermined length has been processed, and the amount of bending determined in advance is compared with the amount of bending. From the relationship, calculate the amount of bending that will result in the above-mentioned bending, correct the calculated bending amount in the opposite direction to the pre-strain of the bending, and adjust the width end of the plate by the plate width restraining member in a form without bending. A method for punching holes using a press, characterized in that holes are punched out at predetermined intervals in the longitudinal direction of a long strip material while restraining the material so as not to bulge.