JPS60148629A - Press punching method of short-sized plate - Google Patents

Abstract

PURPOSE:To eliminate a single-size load of a punch, and to prevent a damage to a die by punching simultaneously the terminal edge of a preceding short-sized plate and the initial edge of its following short-sized plate, when executing press punching by punches which are arranged zigzag. CONSTITUTION:The number of strokes of a crank press 13 is counted for every short-sized plate fed in successively, and before a stroke of press punching containing the terminal edge of a preceding short-sized plate, that is to say, before press punching of a small piece 5, its following short-sized plate 1' is fed in and crossover punching can be executed. This feed-in quantity is controlled by measuring a rotational angle of a roller 10 after the time point when the short-sized plate 1' is pinched by the roller 10. In this way, when the short-sized plate 1' is fed in by a prescribed quantity so that the crossover punching can be executed, the short-sized plates 1, 1' are pinched by clamp cylinders 12, and the terminal edge of the preceding short plate 1 and the initial edge of the following short plate 1' are punched simultaneously by a press.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for continuously press-cutting small pieces of a predetermined shape from a short plate.

Conventionally, as the above-mentioned method, a method has been adopted in which punches are arranged in a staggered manner, the interval between the punches is set at one pitch, and the short plate is moved one pitch per stroke for punching. For example, as shown in Fig. 1, five small pieces 2 arranged in a staggered manner are punched out from a short plate 1 in the first stroke (however, three of the five pieces have their starting edges partially cut off). (It is either pressed or not punched at all.) In the second stroke, the short plate 1 is transferred by one pitch and five small pieces 3 are punched out. Similarly, the third stroke presses out the small piece 4, and the fourth stroke presses out the ξ small piece 5 (however, 3 of the 5 small pieces have their terminal edges partially pressed out. , it is a blank that has not been done at all).

However, in the above case, in Fig. 1, the total length of the short plate 1 is the length of the L1 piece! If the interval between the small pieces is C, unless the following relationship is satisfied: 3/+3C<L≦3A'+4C, at least one of the starting edge and the ending edge of the short plate 1 will be unloaded. In other words, it was not possible to obtain a small piece with a perfect shape, and the starting edge and the ending edge were partially pressed out, and there was a risk that the punch would become loose during this pressing process and damage the mold. .

The present invention provides a press punching method that eliminates the unbalanced load on the punch during press punching, eliminates the risk of mold damage, and improves the life of the punch.

That is, the present invention uses punches arranged in a staggered manner, and when the punches are arranged at intervals of one pinch and a short plate is transferred by one pitch per stroke for press punching, as shown in FIG. It is characterized in that the terminal end edge of the preceding short board 1 and the starting end edge of the following short board 1' are press-cut at the same time. The following short plate 1' is sent in at an appropriate distance from the preceding short plate 1, and the terminal edge of the preceding short plate 1, which has been partially pressed in the past, and the starting edge of the raft-shaped subsequent short plate 1' are aligned with each other. By straddling them and punching out the brace at the same time, the unbalanced load on the punch can be effectively prevented.

In order to feed subsequent short plates at appropriate intervals, perforations 6 are formed on both sides of the short plate 1', as shown in FIG.
is provided, the number of holes passed through is counted by an optical sensor, and control is performed so that feeding is stopped when a predetermined number of holes has been counted. Furthermore, as will be described later, the rotation angle of the feed roller of the roller feed device may be measured to control the feed amount.

Next, an example of press punching will be described together with its apparatus.

In FIG. 4, the short plate l is stored in a cassette 7, and after being sucked up by a suction cylinder 8, it is inserted into a roller 10 by a transfer cylinder 9. At the next instant, the short plate 1 is pressurized by the roller clamp cylinder 11, and is sent into the press punching device by the rotation of the roller IO. Thereafter, it is clamped and fixed by the clamp cylinder 12, and press punched by the stroke of the crank press 3. With each stroke, the short plate 1 is fed by 1 pitch by the gripper cylinder 14. That is, when the crank press 13 is lowered and unpressed, the clamp cylinder 12 is opened in that state, and in FIG. 4, the clamp cylinder 12 is moved one pitch to the left by the operation of the gripper cylinder 14. The clamp cylinder 12 closes again and clamps the short plate 1, and after the crank press 13- rises, the gripper cylinder 14 operates to move the clamp cylinder 12 to the right side.
After moving by a pitch, the next press punching process is performed.

In this way, the short plates are fed l or l pitch at a time and are successively press-cut.

At this time, the number of strokes of the crank press 13 is counted for each short plate that is successively fed, and before the press stroke including the terminal edge of the preceding short plate, in other words, in the example of FIG. 1, the press of the small piece 5 is The subsequent short plate 1' before punching
is sent in, making it possible to straddle and pull out. This feeding (2) is controlled by measuring the rotation angle of the roller 10 from the time when the short plate 1' is sandwiched between the rollers 10. In this way, when the short plate 1' is fed a predetermined amount so that it can be pulled out, the clamp cylinder 12 clamps the short plate 111' between the terminal edge of the preceding short plate 1 and the following short plate 1'. At the same time, press out the starting edge of the

As described above, according to the present invention, regardless of the length of the short plate, press punching can be performed continuously without the punch being loaded on one side.

Eliminating single loads allows for stable press punching, prevents breakage of the mold, and extends its lifespan.
Its industrial value is extremely great.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a press punching method to which the present invention is applied, FIG. 2 is a plan view illustrating the present invention, and FIG. 3 is a plan view showing an example of a short plate used in the present invention. FIG. 4 is a side view showing an example of an apparatus for implementing the present invention. 1.1' is a short plate, 2.3.4.5 is a small piece patent applicant 6-

Claims (1)

[Claims] 1. When punches are arranged in a staggered manner and the punches are arranged at one pitch and the short plate is transferred one pitch per stroke for press punching, the terminal edge of the preceding short plate and the following ( A press punching method for short plates, characterized by punching out the starting edge of the short plates at the same time.