JP2515030B2 - How to punch a U-shaped plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a method for punching out concentric and same-shaped holes in upper and lower plates of a U-shaped bent plate.

(Prior Art) Generally, as a method of forming concentric and same-shaped holes in the upper and lower plates of a U-shaped plate, spacers are inserted between the upper and lower plates of the U-shaped plate and clamped, and then the upper plate / spacer.
There is a method of simultaneously machining the lower plate. Alternatively, there is a method in which a flat plate is dimensionally developed at a hole position, a hole is punched by a primary press work, and then a U-shaped bending is performed by a secondary work.

(Problems to be Solved by the Invention) As described above, when the spacers are inserted into the upper and lower plates of the U-shaped plate and clamped, and then the upper plate, the spacer and the lower plate are simultaneously machined, the upper and lower plates are thin plates. Therefore, there is a problem that the machined hole is elliptical or peels around the machined hole. When performing U-shaped bending after drilling, which is another method, it is very difficult to obtain the concentricity of the hole after U-shaped bending, and it is almost impossible to obtain perfect concentricity.

In any of the above cases, there remains a problem that the hole shape or the concentricity accuracy of the upper and lower holes cannot be obtained.

The present invention solves the above problems, and provides a U-shaped plate punching method capable of easily punching concentric and same-shaped holes in upper and lower plates of a U-shaped plate in a press stroke in a short time. The purpose is to do.

[Structure of Invention]

(Means for Solving the Problem) That is, according to the method for punching a U-shaped plate of the present invention, an intermediate plate having an air flow path groove for discharging an upper punching die is removed by sandwiching the intermediate plate with the U-shaped plate. It is placed on a die plate with a punching die, and punches the upper and lower holes in the press stroke.

(Operation) In the punching method for the U-shaped plate of the present invention having the above-described configuration, it is possible to easily punch the upper and lower plates of the U-shaped thin plate in the same core and in the same shape between the minor axes in the press stroke.

(Example) Hereinafter, the details of the method for punching a U-shaped plate of the present invention will be described with reference to the drawings for one example.

FIGS. 1, 2, and 3 show an implementation state of a method for punching a U-shaped plate according to an embodiment of the present invention, in which a punch (2) is fixed to a punch holder (1), The punch (2) slides vertically through the punch guide (4) fixed to the stripper plate (3) and the stripper guide (6) driven into the guide holder (5) while maintaining hole position accuracy. To do. The guide holder (5) is fixed to the die plate (8) in which the pilot hole die (7) is fitted by tightening bolts and knock pins to maintain the positional accuracy on the die side and the punch side. The die plate (8) has upper and lower plates (9a, 9b) of the U-shaped plate (9).
The intermediate plate (10) for holding the space is attached by the intermediate plate guide screw (11) while maintaining the hole position accuracy, but a plurality of ball springs (12) inserted in the die plate (8) are attached. ) Has become a floating mechanism. Upper plate die (13) for intermediate plate (10)
It has an air passage groove for discharging the upper hole scrap (9c) to the outside of the intermediate plate (10). The stripper plate (3) for holding the upper and lower (9a, 9b) of the U-shaped plate (9) and the intermediate plate (10) in the die plate (8) is a stopper bolt via a spring (14) to the punch holder (1). It is connected by (15).

As shown in FIG. 2, the air is guided from the outside of the press die through the air pipe (16) and the joint (17) to the air flow passage groove in the intermediate plate (10).

That is, first, a ram plate attached to a press ram (not shown) descends to lower the punch holder (1). Along with that, the punch (2) and the stripper plate (3) are also lowered, and the stripper plate (3) comes into contact with the upper plate (9a) of the U-shaped plate (9) and between the punch holder (1) and the stripper plate (3). The upper and lower plates (9a, 9b) of the U-shaped plate (9) and the intermediate plate (10) are compressed by a certain spring (14) into a die plate (8).
Hold down. Furthermore, the punch (2) continues to descend and the upper plate (9
Punch a). After punching, the upper hole scrap (9c) descends together with the punch (2), and when the upper hole scrap (9c) comes to the air passage groove of the intermediate plate (10), it is discharged to the outside of the intermediate plate (10) by air pressure. To be done. on the other hand,
The punch (2) further descends and punches the lower plate (9b) without any trouble. The spit (9d) is shot down as it is.

FIGS. 4 to 5 show the U-shaped plate (9) which has been punched, and punched at two locations simultaneously in the press stroke.

That is, in the method for punching the U-shaped plate of this embodiment,
In the press stroke, punching of concentric holes of the same shape can be easily performed on the upper and lower plates of the U-shaped plate in a short time.

Further, in the above-mentioned embodiment, the U-shaped plate is punched with the same shape of the upper and lower plates. However, if the punched hole has the same shape as the upper and lower plates, other holes may be used.

〔The invention's effect〕

As described above, according to the present invention, it is possible to easily punch holes of the same core and the same shape on the upper and lower plates of the U-shaped plate in the press stroke in a short time.

[Brief description of drawings]

FIG. 1 is a sectional view showing a state of implementation of a method for punching a U-shaped plate according to the present invention, FIG.
FIG. 3 is an enlarged view of part A of FIG. 1, FIG. 4 is a top view of the U-shaped plate after punching, and FIG. 5 is B of FIG.
FIG. 1 …… Punch holder, 2 …… Punch 3 …… Stripper plate 5 …… Guide holder, 7 …… Prepared hole die 8 …… Die plate, 10 …… Intermediate plate 13 …… Upper hole die, 20 …… Air flow Roadway

Claims (1)

(57) [Claims] 1. A U-shaped plate is sandwiched by an intermediate plate having an air flow channel for discharging dregs, which is carried by an upper hole punching die, and is placed on a die plate having a lower hole punching die, and an upper hole is punched by a punch. A method for punching a U-shaped plate, characterized by punching the hole and the pilot hole in a press stroke.