JPS5919038A - Outrun working and die in punch press - Google Patents

Abstract

PURPOSE:To work the periphery of additional hole neatly by producing an easily cut slack part by succeeding blanking on both sides of the tip of preceding blanking of a punch press, and making outrun working by succeeding blanking. CONSTITUTION:In a die 1 consisting of a die 3 having a square hole and a punch 5, corner clearances 15, 17 larger than other outer peripheral clearance 13 to the die 3 are provided at two corners 9, 11 in the direction of an outrun blanking of the punch 5 shown by the arrow 7. The outrun blanking of three steps A, B, C is performed using this die 1. The part corresponding to slack parts 23, 25 of the third step C directed to the center corresponding to two corner clearances 15, 17 of each steps are overlapped parts 19, 21 of the outrun blanking, and removed completely by succeeding blanking.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a J3 punching method and mold for pan-desires, and more specifically, it involves generating drooping parts that are easy to cut out in the subsequent punching process, and cutting out the drooping parts one after another.
This invention relates to a processing method for beautifully machining the area around a punched hole and a mold used for this punching process.

Conventionally, the molds used for pandesires have a uniform gap between the punch and the tie over the entire circumference of the mold shape, and leakage of clearance has occurred. Therefore, when punching an independent hole IJ, it is not very noticeable [However, after punching with a square mold C (hole + 111-1 from one punch, shift the plate U in one direction and punch with the same mold) The process of punching out long holes with continuous holes.

), a phenomenon in which small protrusions as shown in Fig. 2 remain on both side walls in the passing direction after subsequent punching occurs, for example, when a hole to be moved in the longitudinal direction in a long hole is removed.
There are disadvantages such as problems such as not being able to move smoothly and deterioration of the aesthetic appearance.

This phenomenon occurs because when the first hole punched is a corner, the vertical and horizontal clearances overlap at the corner, so the sagging part protrudes more toward the center of the passing width than other parts. However, this is because the protrusion is not large enough to be cut by subsequent punching. As a result, the later punch C' is pushed by the punch and bent or pushed into the base material, and when the punching process is finally completed, it becomes a small protrusion similar to the J shown in Figure 2. It appears.

The present invention has been made to overcome the above-mentioned disadvantages, and preferred embodiments thereof will now be described in detail with reference to the drawings.

In the mold 1 according to the embodiment of the present invention shown in FIG. 1, the die 3 has a rectangular hole, while the punch 5 has holes 9 and 11 at both corners of the arrow 7 indicating the overtaking direction. Both corner clearances 15 and 17 are provided which are larger than the other opposing clearances 13 on the outer periphery.

FIG. 3 shows a state in which three stages of overtaking A, B, and C are performed using the mold 1 consisting of a pair of the die 3 and punch 5 described above.

In FIG. 3, the hatched areas between Δ and B and between B and C are additionally added. There are unique overlapped parts 19 and 21C. Also, the upper and lower floors at the left end of C have both corner clearances of 15.
17, and the sagging portion 23°25 protrudes more toward the center of the overtaking width than that punched with a conventional uniform clearance die.

Figure 4 shows the state in which the last stage of [additional handling] [2] has been punched out,
After receiving the inside of the mold 1, the direction of the bump 5 is changed by 180°.
Drop portion 2≦ that occurred during punching of 7 Tee / Front 11 I)
), 31 were completely cut off.

Using the example mold of the present invention detailed above, additional I
By performing this method, you can obtain a sag with enough protrusion to cut it in the subsequent overtaking process, so as shown in Figure 4, during overtaking process, you can remove small protrusions that are inconvenient on the side of the hole. We were able to obtain a smooth and beautiful elongated hole without leaving any residue.

[Brief explanation of drawings]

Fig. 1 is a plan view of a mold according to an embodiment of the present invention, Fig. 2 is a plan view of an elongated hole shape created by the addition of a conventional mold with uniform clearance all around the circumference, and Fig. 3 is a plan view of an elongated hole shape made by a conventional mold with uniform clearance all around. , B, is a plan view of the progress state of the overtaking process at the 03rd stage, and FIG. 4 is a plan view of the process state at the final stage E of the same. Explanation of symbols representing the main parts of the drawing 1...Mold 3...Die 5...Punch 13...Perimeter clearance 15...Both corner clearance 23...Dip portion 25... Partial patent applicant: AMADA Co., Ltd.

Claims (2)

[Claims] (1) During additional punching in the punch press, a sagging part is created on both sides of the leading edge of the previous stage punching, which is cut off by the subsequent punching process, toward the center of the punching width, and the sagging part is cut off by the subsequent punching process. Method. (2) A mold used for additional punching (3) in a punch press, with clearance parts for the die larger than the other surrounding areas at both ends in the punching direction.