JPH10263706A - Punching press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a punching press not leaving any curved strain by press working in a work. SOLUTION: In the punching press 10 providing with the die 11 arranged in the upper side of the press, the punch 13 fixed and arranged in the lower side and the plate 15 provided in the punch side, the surface 15b facing the die of the plate 15 is formed into an upward projecting curved surface and an elastic body 17 is provided in the die 11. When the die 11 and the punch 13 are approached to execute press working to the work, the work is held between the elastic body 17 and the curved surface 15b and the curved strain along this curved surface is given to the work. This strain is offset with the curved strain given by press working, whereby the strain is hardly left in the work.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punching press apparatus, and more particularly to a punching press apparatus in which a workpiece after press working does not cause a bending distortion due to warpage.

[0002]

2. Description of the Related Art A punching press apparatus has a die and a punch, presses a work therebetween, and presses the work such as bending and punching. FIG. 3 shows a conventional punching press device. The punching press apparatus 1 shown in FIG. 1 has a die 2 at an upper part and a punch 3 at a lower part. The punch 3 is a punch holder 4
And the punch holder 4 is fixed to the main body of the punching press device so as not to move. The die 2 is movable in the vertical direction in the figure, and has a hole 2a at a position facing the punch 3 so that the punch 3 can enter.

[0003] A plate 6 is attached to the punch holder 4 via elastic members 5, 5.
Can move in and out of a hole 6a formed in the center of the hole.
A work 8 made of a metal plate such as a steel plate is fed along the upper surface of the plate 6, inserted between the die 2 and the punch 3 and placed at a predetermined position, and the die 2 is placed as shown in FIG. When the workpiece 8 is moved downward and pressed against the work between the die 2 and the punch 3, a bent portion 8 a is formed at a portion of the work 8 sandwiched between the punch 3 and the die 2. Thereafter, the die 2 is moved to the position shown in FIG.
When it moves upward as shown in (1), a gap is formed between the punch 3 and the plate 6 rises by the return force of the elastic members 5 and 5, and the work 8 is forcibly lifted from the punch 3. When the work 8 lifted in this way is moved, the die 2 is lowered again, and another part of the work 8 is pressed against another, a bent portion 8a is formed there. By repeating the above, a large number of bent portions 8a are formed at predetermined positions of the work 8,
For example, a corrugated plate can be obtained.

[0004]

However, in the above-mentioned punching press, the work 8 after press working is applied to the work 8 shown in FIG.
A curved distortion as shown in FIG. Therefore, a process for correcting this distortion was required. In addition, when the distortion is large, the punching press itself cannot be performed, and continuous processing may not be performed.

The present invention has been conceived in view of the above facts, and it is an object of the present invention to provide a punching press apparatus which does not leave a bending distortion on a work by press working.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a die and a punch which are arranged to face each other and at least one of which is advanced or retracted toward a counterpart, and the die provided on the punch side. In a punching press apparatus having a plate that can move forward and backward, the surface of the plate facing the die was a curved surface, an elastic body was provided on the die, and the die and the punch approached to perform press working on the work. At this time, the elastic body sandwiches the work between the elastic body and the curved surface and applies a curved strain to the work along the curved surface. Alternatively, the curved surface may be configured to be a cylindrical surface protruding toward the die, or the elastic body may be configured to be made of urethane rubber.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a main part of a punching press apparatus 10 according to the present invention. The punching press device 10 has a die 11 as an upper die and a punch holder 12 as a lower die. The punch holder 12 has a punch 13 standing in the center toward the die 11. The die 11 is provided with a hole 11a into which the punch 13 enters.
Further, a plate 15 is attached to the punch holder 12 via an elastic body 14, and the punch 13 can pass through a hole 15 a of the plate 15. 16 is the plate 1
5 is a guide pin for determining the trajectory of the vertical movement of No. 5. The above configuration is the same as the conventional example.

The present invention is characterized in that a plurality of elastic bodies 17 are provided below the die 11, and the surface of the plate 15 facing the die 11 is a curved surface 15b. As the elastic body 17, urethane rubber is used. The above curved surface 15
Although b is shown as an arc whose cross section is upwardly convex in the illustrated embodiment, it is not a spherical surface but a cylindrical surface that forms a part of a cylindrical shape.

FIG. 2 shows a state in which a workpiece is processed by the punching press apparatus of the present invention. First, the die 11 is raised upward, the interval between the die 11 and the punch 13 is widened, and the work 8 made of a plate material such as a steel plate is inserted between the die 11 and the punch 13 and positioned at a predetermined position. Next, FIG.
As shown in (a), the die 11 is lowered, and the work 8 is pressed between the die 11 and the punch 13. Then, a bent portion 8a is formed in a portion of the work 8 sandwiched between the die 11 and the punch 13. At the same time, the tip of the elastic body 17 provided on the die 11 transfers the work 8 to the curved surface 15 of the plate 15.
b to give the workpiece 8 a curved strain along the curved surface 15b.

When one press working is completed and the die 11 is raised again, the plate 15 is raised by the elastic body 14 and the work 8 is removed from the punch 13. The work 8 is simply placed on the plate 15 and returns to the natural state. At this time, the bending strain applied by the curved surface 15b is
The bending distortion given by the press working (the bending distortion that would occur when there is no curved surface 15b and flat) is canceled out, and a straight state with almost no distortion is obtained.

In general, when a workpiece is processed by the above-mentioned punching press, if the processing conditions such as the thickness of the work, the material, the shape and size of the punch, the pitch between the bent portions 8a, and the like are determined, the press work is performed. The shape (curvature radius) of the bending strain is also determined. In addition, since this curved distortion is usually a cylindrical surface having an arc-shaped cross section, the surface 11b of the plate 11 is formed as a cylindrical surface in the opposite direction so as to apply a distortion opposite to this distortion. At this time, if the radius of curvature of the surface 11b is appropriate, the bending distortion is canceled and a flat work can be obtained. The radius of curvature of the surface 11b is initially determined by trial and error, but can be determined by calculation or the like as the number of actual examples increases.

As the elastic body 17, a metal coil spring or the like can be used, but if it is made of urethane rubber, the condition will be improved. That is, as shown in FIG. 2A, when the bent portion 8a hits the lower surface 17a of the elastic body 17, the bent portion may be deformed with a metal coil spring. If it is made of rubber, the lower surface 17a of the elastic body 17 is deformed along the bent portion 8a, and the bent portion 8a is surely deformed along the surface 15b without deformation.

Depending on conditions such as the shape of the punch, the material of the work, and the thickness of the work, the work may be distorted in the direction opposite to that shown in FIG. In such a case, the configuration of the punching press apparatus is such that the die 11 is a lower mold, and the punch 13 and the plate 15 are an upper mold, that is, FIG.
Alternatively, the curved surface 15b of the plate 15 may be a concave curved surface (a downwardly convex shape).

Further, in the above-described embodiment, the punching press apparatus performs the bending process. However, even in the case of the punching process, a bending distortion may occur. According to the present invention, such a distortion is eliminated. It is also possible.

Further, in the present invention, the surface of the plate 15 is a curved surface, and only the elastic body 17 is attached to the die 11, so that the configuration is simple. In particular, various curved surfaces can be obtained simply by replacing the plate 15, and it is easy to respond to changes in processing conditions.

[0016]

According to the present invention as described above,
In a punching press apparatus having a die and a punch which are arranged to face each other and at least one of which moves toward and away from the other side and a plate which is provided on the punch side and which can move toward and away from the die, The surface to be curved is a curved surface, and an elastic body is provided on the die, and when the die and the punch approach each other and press work is performed on the work, the elastic body sandwiches the work between the work and the curved surface and follows the work along the curved surface. Since the curved distortion is given, the curved distortion applied at the time of press working can be offset, and a work with almost no distortion can be obtained.

If the elastic member provided on the die is made of urethane rubber, the elastic member is deformed even if there is a bent portion in the portion of the work pressed by the elastic member, so that the work can be pressed without being deformed. it can.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a configuration of a main part of a punching press device of the present invention.

2A and 2B are diagrams illustrating the operation of the present invention, in which FIG. 2A is a diagram illustrating a state during press working, and FIG. 2B is a diagram illustrating a completed state of press working.

3A and 3B are diagrams illustrating a configuration of a main part of a conventional punching press device, in which FIG. 3A illustrates a state during press working, and FIG. 3B illustrates a completed state of press work.

[Explanation of symbols]

 Reference Signs List 8 Work 10 Punching press device 11 Die 13 Punch 15 Plate 15b Surface facing die 17 Elastic body

Claims (3)

[Claims] 1. A punching press apparatus comprising: a die and a punch, which are disposed to face each other, at least one of which advances and retreats toward a counterpart, and a plate provided on the punch side and which can advance and retreats toward the die. The surface of the plate facing the die is a curved surface, and an elastic body is provided on the die. When the die and the punch approach each other and press-work the work, the elastic body sandwiches the work between the curved surface and the work. A punching press device for applying a bending strain along the curved surface to the punching press. 2. The punching press according to claim 1, wherein the curved surface is a cylindrical surface protruding toward the die. 3. The punching press according to claim 1, wherein the elastic body is made of urethane rubber.