JP2514790Y2 - Punching mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a punching die, and more particularly to improvement of a part of stripper plates constituting the punching die.

(Prior Art) Conventionally, when punching a work with a punch press, a die including a punch and a die is used. That is, the work is placed on the die and punching is performed by the cooperation of the punch and the die.

The punch includes a punch head in the upper part and a vertically movable punch body in which a punch blade part is integrated in the lower part, a punch guide that guides when the punch body is mounted and moves up and down, and an upper part of the punch guide. An ammo that urges the punch body upward between the punch head and
A stripper plate is provided below the pan guide to hold the punched work.

Moreover, the stripper plate provided under the punch guide is made of iron, urethane, or the like.

(Problems to be solved by the invention) By the way, as mentioned above, when the material of the stripper plate is iron, the stripper plate first hits the work when punching the work. Since the noise and vibration generated at that time were extremely large, there was the problem of noise pollution.

Further, when the material of the stripper plate is urethane, the pressing force for pressing the work punched by the stripper plate is weak and the lateral pressure at the time of punching is weak, so that there is a problem that burrs are largely generated on the work.

An object of the present invention is to provide a punching die provided with a stripper plate so as to suppress vibrations and noises and hold a work with a sufficient pressing force in order to solve the above problems.

[Structure of the Invention] (Means for Solving the Problems) In view of the conventional problems as described above, the present invention provides a lower end portion of a punch guide in which a punch body having a punch blade portion at the lower end is vertically movable. In a punching die provided with a stripper plate, the stripper plate has a sandwich structure in which a cushioning material is sandwiched between a work surface side plate contacting a work and a punch guide side plate, and The thickness is set to be equal to or less than the thickness of the plate on the work surface side.

(Embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 3, a pair of rotatable upper turrets is provided for a turret punch press as a punch press, for example.
It is equipped with T _U and lower turret T _D. A plurality of punches 1 and dies 3 as punching dies are mounted around the circumference of the upper turret T _U and the lower turret T _D at appropriate intervals.

Of these plurality of punches 1 and dies 3, appropriate punches 1 and dies 3 are indexed to the processing position, and the work W placed on the dies 3 is subjected to desired punching processing by the vertical movement of the punches 3. Will be done.

For example, a hollow cylindrical punch guide 5 forming a part of the punch 1 is mounted in the mounting hole H of the upper turret T _U. A vertically movable punch body 7 is mounted in the punch guide 5, and a punch blade portion 9 is integrally provided below the punch body 7.

A punch driver 11 is fixed to the upper part of the punch body 7 with bolts 13. The punch body 7 and the punch driver 11 may be integrated. A punch head 15 is fixed to the upper part of the punch driver 11 with bolts 17.

A strip spring 19 as an ammunition is interposed between the flange 5F formed on the upper portion of the punch guide 5 and the flange 11F formed on the upper portion of the punch driver 11 to urge the punch body 7 upward. ing.

A lift spring 21 is interposed between the groove G formed in the upper turret T _U and the flange 5F of the punch guide 5 to urge the punch guide 5 upward. The urging force of the lift spring 21 is set to be stronger than the urging force of the strip spring 19.

A stripper plate 25 is held at the lower end of the punch guide 5 by a plurality of leaf springs 23.

With the above configuration, when a striker (not shown) hits the punch head 15, the punch guide 5 descends against the urging force of the lift spring 21 and contacts the work W placed on the die 3. Then, the punch body 7 is lowered through the punch head 15 and the punch driver 11 against the urging force of the strip spring 19, so that the punch blade portion 9 performs a desired punching process on the work W.

As shown in FIG. 1, the stripper plate 25 held by a plurality of leaf springs 23 at the lower end of the punch guide 5 has a work W surface side portion made of an iron plate 25A and a work W surface side portion. The lower end portion of the punch guide 5 on the opposite side is also made of an iron plate 25B, and a cushioning material 27 such as rubber, urethane, or a damping steel plate is interposed between the iron plate 25A and the iron plate 25B. That is, the stripper plate 25 has a three-layer structure and the cushioning material 27 is sandwiched between them.

With the above configuration, the stripper plate 25 contacts the work W placed on the die 3 and the punch blade portion 9
Vibration and noise generated when punching a workpiece W with a cushioning material
It is absorbed by 27 and can be greatly suppressed compared with conventional vibration and noise, and it is eliminated from noise pollution.

Further, as is clear from FIG. 1, the thickness of the cushioning material 27 is such that the plate 25A and the plate 2 on the side in contact with the work W are
Since the thickness is 5 B or less and is thin, it is possible to suppress an increase in the overall thickness even if the cushioning material 27 is sandwiched, and suppress the generation of noise as described above. Is what you can do.

Further, since the cushioning material 27 is thin, when the work W is pressed and fixed by the stripper plate 25, the cushioning material 27 is crushed into a rigid form, and the transmission of the pressing force from the plate 25B side to the plate 25A side is directly performed. This is a mode in which the pressing force is transmitted to an extremely large pressing force.

The structure of the stripper plate 25 has been described with reference to the sandwich structure as shown in FIG. 1.
A two-layer structure of the iron plate 25A and the cushioning material 27 can be used without providing 25B. Further, as shown in FIG. 2, even if the punch guide 5 and the stripper plate 25 are integrated and the cushioning material 27 is interposed therein, the same effect as that shown in FIG. 1 is exhibited. can do. In this case as well, it goes without saying that at least the iron plate 25A is provided on the side for pressing the work W.

The present invention is not limited to the above-described embodiments, but can be implemented in other modes by making appropriate changes.

[Effects of the Invention] As can be understood from the above description of the embodiments, the present invention is, in short, a punch guide (7) in which a punch body (7) having a punch blade portion (9) at the lower end is vertically movable. 5) A punching die having a stripper plate (25) at the lower end of the stripper plate (25)
A plate (25
A) and a plate on the side of the punch guide (5) are sandwiched with a cushioning material (27), and the thickness of the cushioning material (27) is the same as that of the plate (25A) on the work surface side. It is provided below.

As is apparent from the above configuration, in the present invention, the stripper plate 25 provided on the punch guide 5 in the punching die has the cushioning material 27 between the plate 25A on the work surface side that abuts the work W and the plate on the punch guide side. And a cushioning material 27 is provided below the thickness of the plate 25A on the work surface side.

Therefore, at the time of punching, the shock generated when the punch guide 5 comes into contact with the work W is alleviated by the cushioning material 27, and the generation of noise can be suppressed.

Further, since the thickness of the cushioning material 27 is equal to or less than the thickness of the plate 25A on the work surface side, in other words, the thickness dimension of the plate 25A on the work surface side is increased so that deformation does not occur during processing. The presence of the cushioning material 27 tends to increase the overall thickness dimension of the stripper plate, but by making the thickness of the cushioning material 27 thinner than the thickness of the plate 25A on the work surface side, the overall thickness is reduced. It is possible to prevent the size from becoming large, and since the cushioning material 27 is thin, it is crushed during punching and becomes a rigid body, and the transmission of the pressing force of the plate 25A on the work side is directly transmitted from the plate on the punch guide side. The plate 25A on the work side can firmly press the work W, which is similar to fine blanking during the punching process. Lifting is easy.

[Brief description of drawings]

FIG. 1 shows a main part of the present invention, and an enlarged detailed view of an arrow I portion in FIG. 3, FIG. 2 is another embodiment diagram replacing FIG. 1, and FIG. 3 is punching according to the present invention. Die punch,
FIG. 5 is a cross-sectional view showing a state in which the die is mounted on the upper and lower turrets. 1 ... Punch (punching die) 3 ... Die, 5 ... Punch guide 7 ... Punch body, 9 ... Punch blade 11 ... Punch ribber, 15 ... Punch head 19 ... Stripper spring (ammo) 23 …… leaf spring, 25 …… stripper plate 25A, 25B …… iron plate 27 …… cushioning material

Claims (1)

(57) [Scope of utility model registration request] 1. A punch guide (5) in which a punch body (7) having a punch blade portion (9) at its lower end is internally movably mounted.
A punching die having a stripper plate (25) at the lower end of the stripper plate (25)
A plate (25
A) and a plate on the side of the punch guide (5) are sandwiched with a cushioning material (27), and the thickness of the cushioning material (27) is the same as that of the plate (25A) on the work surface side. A punching die characterized by being provided below.