JP2002172434A - Plate stock supporting structure and method of stamping die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformly hold a plate stock by a striper plate and necessarily and sufficiently supply holding pressure therein. SOLUTION: In the stamping die 1 having a punch 8 and die 11 for stamping the plate stock out and the striper plate 14 for pressing and fixing the plate stock 12 when stamped out, a plurality of hydraulic cylinders 16 in which the striper plate 14 is pressed toward the die 11 are arranged on an upper part of the striper plate 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punching die provided with a punch and a die for punching a plate material, and a stripper plate for pressing and fixing the plate material at the time of punching, and pressing the stripper plate to fix the plate material appropriately. The present invention relates to a plate material supporting structure and a supporting method for a punching die.

[0002]

2. Description of the Related Art In a punching die including a punch, a die, and a punch and a die for punching a plate material, and a stripper plate for pressing and fixing the plate material at the time of punching, a steel die is conventionally provided on the back side (upper side) of the stripper plate. A plurality of stopper blocks or springs are provided.

FIG. 5 is a sectional view showing a punching die provided with a plurality of springs on the back side (upper part) of a stripper plate. Hereinafter, the case where the stripper plate is pressed by the spring will be described with reference to FIG.

As shown in FIG. 5, a punching die 51 is provided with a punch backing plate 53 at a lower portion of an upper die 52, and a punch 54 is fixed at a lower portion thereof. A die 55 having a die hole (not shown) is provided below the die 55. Punch backing plate 53 and die 5
5, a stripper plate 56 is provided.

[0005] The stripper plate 56 is attached to the lower surface of the punch backing plate 53 via a spring 57.

In FIG. 5, reference numeral 58 denotes a plate, and 59 denotes a guide post.

[0007] The plate member 58 is guided by the guide post 59, is fed between the die 55 and the stripper plate 56, and is clamped. The force for pressing the plate member 58 at this time is given by a spring 57 arranged above the stripper plate 56. Then, in this state, the entire upper die descends, and punching is performed between the punch 54 and the die 55.

[0008]

However, the conventional punching dies have the following problems.

In a punching die in which a stopper block presses a stripper plate, all the stopper blocks are simultaneously polished and their heights are made uniform, so that the stripper plate uniformly presses the plate material. , Processing accuracy of stripper plate and die is low,
When the parallelism is not obtained, it is difficult to uniformly hold the plate with the stripper plate.

[0010] Even when the load applied to the stripper plate is an uneven load, it is difficult to uniformly press the plate material with the stripper plate.

On the other hand, in the punching die for pressing the stripper plate 56 by the spring 57 shown in FIG. 5, the same problem as described above occurs, and in some cases, the pressing pressure is insufficient. .

The present invention has been devised in order to solve the above-mentioned problems. An object of the present invention is to provide a stripper plate capable of uniformly pressing a plate material and providing a necessary and sufficient pressing pressure. It is an object of the present invention to provide a punching die plate supporting structure and a supporting method capable of performing the above.

[0013]

According to the present invention, there is provided a punch and a die for punching a sheet material,
In a punching die having a stripper plate for pressing and fixing a plate material at the time of punching, a plurality of hydraulic cylinders for pressing the stripper plate toward the die are provided above the stripper plate.

According to the above construction, the stripper plate is pressed toward the die by the hydraulic cylinder at the time of punching, so that the pressing pressure can be adjusted, and the plate material can be uniformly pressed by the stripper plate.
The pressing pressure can be provided as necessary and sufficiently.

It is preferable that the plurality of hydraulic cylinders can individually adjust the hydraulic pressure.

Further, it is preferable that the hydraulic cylinder is provided in a punch plate located above the stripper plate.

Further, the present invention provides a stamping die for fixing a plate material by pressing the stripper plate toward the die with a plurality of hydraulic cylinders provided above a stripper plate for pressing and fixing the plate material between the die and the die during punching. This is the method of supporting the plate material of the mold.

[0018]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view showing a preferred embodiment of a plate material supporting structure for a punching die according to the present invention, FIG. 2 is a cross-sectional view showing the punching die of FIG. 1 at the time of punching, and FIG. FIG. 2 is a plan view showing the upper mold of FIG. 1.

First, the overall configuration of the punching die will be described.

As shown in the figure, the punching die 1 includes an upper die 2
And a lower mold 3. The upper mold 2 and the lower mold 3 are connected via a hydraulic cylinder 4, and the upper mold 2 moves up and down by expansion and contraction of the hydraulic cylinder 4.

A punch backing plate 5 is provided below the upper die 2. A punch plate 6 is provided below the punch backing plate 5.
A plurality of punch support holes 7 are formed in the punch plate 6, and the punches 8 are inserted into the punch support holes 7 and fixed respectively.

Below the punch 8 is a punch 8 at the time of punching.
And a die 11 having a die hole 9 into which a scrap is inserted. This die 11 is fixed to the upper part of the lower mold 3.

Between the punch plate 6 and the die 11,
A stripper plate 14 for pressing and fixing the plate 12 at the time of punching is provided. Stripper plate 14
A punch through hole 15 is formed in a portion where the punch 8 is located, so that the stripper plate 14 moves up and down with respect to the punch 8.

The present invention is characterized in that a plurality of hydraulic cylinders 16 for pressing the stripper plate 14 are provided above the stripper plate 14. In the present embodiment, the hydraulic cylinder 16 is inserted and provided in the punch plate 6 located above the stripper plate 14. A hydraulic cylinder insertion hole 17 for inserting and fixing the hydraulic cylinder 16 is formed in the punch plate 6. The hydraulic cylinder 16
Are provided at ten places, and are appropriately arranged around the respective punches 8 (see FIG. 3).

As shown in FIG. 1, when the punching die 1 is not punching (the upper die 2 is being lifted), the hydraulic cylinder 16 has its lower end face in contact with the upper surface of the stripper plate 14. They are arranged so that there is a gap between them.

The height of the lower end surface of the hydraulic cylinder 16 is set so that the lower end surface of the hydraulic cylinder 16 comes into contact with and presses the upper surface of the stripper plate 14 when the press machine enters the bottom dead center state.

These hydraulic cylinders 16 are connected to a control device (not shown) so that the hydraulic pressure can be adjusted individually.

Reference numeral 18 in FIGS. 1 and 2 denotes a guide post for guiding the plate 12 onto the die 11.

Next, the operation of the method for supporting the plate material of the punching die according to the present invention and the operation of the plate material supporting structure of the punching die having the above configuration will be described.

When performing the punching, the plate 12 is set, the hydraulic cylinder 4 expands and contracts, and the upper die 2 descends. Then, as shown in FIG. 2, when the press machine is in the bottom dead center state, the hydraulic cylinder 16 contacts the upper surface of the stripper plate 14, and the stripper plate 14 is pressed, and the stripper plate 14 removes the plate 12. It will be fixed by pressing.

At this time, since the hydraulic pressure of the hydraulic cylinder 16 has been adjusted in advance so as to have an appropriate pressing pressure, the pressing pressure can be applied sufficiently and sufficiently. Further, since the hydraulic pressure of the hydraulic cylinders 16 can be adjusted individually, even when the processing accuracy of the stripper plate 14 and the die 11 is low and the parallelism is not achieved, each hydraulic cylinder 16 has an optimal holding force. By setting the pressure, the plate member 12 can be uniformly pressed. Therefore,
Product quality accuracy can be improved.

The holding pressure set in the hydraulic cylinder 16 is determined by performing punching in advance with the punching die 1 and observing sagging at the punched portion.

Specifically, when the product manufactured by the punching die 1 was confirmed, it was found that the portion to be punched in the latter half of the punching die 1 had a large droop. Is set high, and the stripper plate 14 presses the plate 12 with a high pressing pressure. Thereby, sag can be suppressed small. Further, in addition to the suppression of sagging, it is possible to obtain the effects such as suppression of the size of burrs, suppression of the magnitude of twisting without narrow width, and improvement of the stability of coining.

In the present embodiment, the hydraulic cylinder 1
The punch 6 is provided in the punch plate 6, but it may be difficult to provide the punch 6 in the punch plate 6 depending on the size of the punching die. In this case, as shown in FIG. 4, a hydraulic cylinder 16 is installed in the upper die 2, and a through hole 21 of the punch backing plate 5 and a through hole of the punch plate 6 are provided between the hydraulic cylinder 16 and the stripper plate 14. If the stud 19 penetrating through the hole 22 is provided, the same operation and effect as the above-described punching die 1 can be obtained.

The number of hydraulic cylinders 16 is ten in the above embodiment, but is not limited to this. As the number of hydraulic cylinders 16 increases, the effect of equalizing the pressing pressure and the like increases.

[0037]

In summary, according to the present invention, since the stripper plate is pressed to the die side by the hydraulic cylinder at the time of punching, the pressing pressure can be adjusted, and the plate material can be pressed uniformly by the stripper plate. And an excellent effect that a pressing pressure can be provided as necessary and sufficiently.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a preferred embodiment of a plate supporting structure of a punching die according to the present invention.

FIG. 2 is a sectional view showing a state of the punching die of FIG. 1 at the time of punching.

FIG. 3 is a plan view showing the upper mold of FIG. 1;

FIG. 4 is a sectional view showing another embodiment of the plate material supporting structure of the punching die according to the present invention.

FIG. 5 is a cross-sectional view showing a plate supporting structure of a conventional punching die.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Punching die 6 Punch plate 8 Punch 11 Die 12 Plate material 14 Stripper plate 16 Hydraulic cylinder

Claims (4)

[Claims] 1. A punching die having a punch and a die for punching a plate material, and a stripper plate for pressing and fixing the plate material at the time of punching, wherein the stripper plate is pressed on the upper side of the stripper plate toward the die side. A plate material supporting structure for a punching die, wherein a plurality of hydraulic cylinders are provided. 2. The plate material supporting structure for a punching die according to claim 1, wherein said plurality of hydraulic cylinders are individually adjustable in hydraulic pressure. 3. The plate supporting structure for a punching die according to claim 1, wherein the hydraulic cylinder is provided in a punch plate located above the stripper plate. 4. The stripper plate is pressed against the die by a plurality of hydraulic cylinders provided above a stripper plate for pressing and fixing the plate material between the die and the die during punching, thereby fixing the plate. A method of supporting a plate material of a punching die.