JPH06328160A - Punching die - Google Patents

Abstract

PURPOSE:To securely perform stripping by a sufficient stripping spring force by installing a gas spring generating a stripping spring force between a punch guide member and a punch head member on the upper part of a punch body. CONSTITUTION:In a punching die 1 on which a punch body 7 is movably mounted on a punch guide member 3, a gas spring 19 generating a stripping spring force between the punching guide member 3 and a punch head member 35 on the upper part of the punching body 7, is provided. The punch body 7 is pulled out from a die 43 and a punched plate material W by a stripping spring force generated by the gas spring, and when a large stripping spring force is required, a stripping spring force is arbitrarily set so that a large stripping spring force is attained by the adjustment of a filled gas pressure. Consequently, stripping is securely performed, and the number of the component parts, is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punching die, and more particularly to a punching die used in a turret punch press or the like.

[0002]

2. Description of the Related Art In a punching die used in a turret punch press or the like, a punch body is movably mounted on a punch guide member. A stripping spring for urging the punch body in the returning direction is attached between the punch guide member and the punch head member above the punch body, and the punch body is punched by the spring force of the stripping spring after punching the punch body. It is pulled out from the die and the punched plate material, that is, stripping is performed.

A coil spring, a disc spring, a urethane spring, etc. are generally used as the stripping spring in this punching die.

[0004]

In pulling out the punch body, the punch body pulling force, that is, the stripping spring force is most necessary when the tip of the punch body is in the middle of the punching portion of the punching plate material. The amount of deflection of the ripping spring is equivalent to the plate thickness of the punched plate material, and is usually about 2 to 4 mm, which is small in a turret punch press or the like.

Since the amount of deflection of the stripping spring is small in the state in which the stripping spring force is most necessary, the stripping spring does not generate a sufficient repulsive force in the state in which the stripping spring force is most necessary. Therefore, the punch body is prone to stripping mistakes in which the punch body does not come out of the punched plate material.

Particularly in the turret punch press, since the space for arranging the punching die in the axial direction is small, there is not enough space for arranging the stripping spring in the punching die for the turret punch press, and stripping is caused by insufficient spring load. It is easy to make mistakes.

While the unmanned operation by the numerical control of the turret punch press is advancing, the stripping mistake of the punching die as described above causes the unmanned operation to be interrupted, which requires a large spring arrangement space. There is a need for a punching die that does not easily cause stripping mistakes.

The present invention has been made by paying attention to the above-mentioned problems in the conventional punching die, and a punching die which does not easily cause a stripping mistake without requiring a large spring arrangement space is provided. It is intended to be provided.

[0009]

SUMMARY OF THE INVENTION According to the present invention, the above object is to provide a punching die in which a punch body is movably mounted on a punch guide member. A punching die is characterized in that a gas spring that generates a stripping spring force is provided between the punch head member and the punching head member.

[0010]

According to the above construction, the stripping spring is composed of the gas spring, and the punch body is pulled out from the die and the punching plate material by the stripping spring force generated by the gas spring. By adjusting the filling gas pressure, the stripping spring force is arbitrarily set so as to obtain a large stripping spring force in the most necessary state.

[0011]

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

FIG. 1 shows an embodiment of a punching die according to the present invention. In FIG. 1, reference numeral 1 generally indicates a punching die. The punching die 1 includes a sleeve-shaped punch guide member 3, a punch body 7 that is fitted and attached to the punch guide member 3 so as to be movable in the axial direction (vertical direction in the drawing), and has a punch blade portion 5 at the tip, and a punch body. It has a stripper plate 9 fixedly mounted on the lower end of the guide member 3, and is fitted and mounted in a die mounting hole 13 formed in an upper turret disk 11 of a turret punch press, and a punch guide member 3 is lifted by a lifter spring 15.
The floating is supported.

A cylinder member 21 of a gas spring 19 is fixedly mounted on the upper flange 17 of the punch guide member 3. A piston member 23 is fitted on the cylinder member 21 so as to be movable in the same direction as the moving direction of the punch body 7, that is, in the same direction as the axial direction of the punch guide member 3. The piston member 23 is located below the cylinder member 2 in the drawing.
1 integrally has a lower rod portion 25 projecting outside and an upper rod portion 27 projecting upward in the drawing to the outside of the cylinder member 21, and the lower rod portion 25 is fixed by sandwiching a spacer 31 with a punch suspension bolt 29. It is connected. A punch head member 35 that is pressed by a striker 33 of a turret punch press is attached to the upper end of the upper rod portion 27.

The piston member 23 cooperates with the cylinder member 21 on the side of the lower rod portion 25 to define a gas filling chamber 37. The gas filling chamber 37 is made into a substantially closed space by the sealing members 39 and 41, and the gas filling chamber 37 is filled with a compressive fluid such as nitrogen gas or helium gas at a predetermined pressure.

The piston member 23 is biased upward in the drawing by the compressive fluid enclosed in the gas filling chamber 37, and is positioned at the upper limit position as shown in the figure under normal conditions to initialize the punch body 7. Lifted into position.

In FIG. 1, reference numeral 43 denotes a die mounted on the lower turret disk 45 of the turret punch press.

The striker 33 descends from the state shown in FIG. 1, and the striker 33 moves the punch head member 3
When 5 is pressed, first, the lifter spring 15 is bent and the entire punching die 1 is moved downward, and the stripper plate 9 is pressed against the punched plate material W on the die 43. As a result, the punched plate material W is sandwiched and fixed by the stripper plate 9 and the die 43.

When the striker 33 is further lowered, the pistunt member 23 is moved downward with respect to the cylinder member 21 while compressing the compressive fluid in the gas filling chamber 37, and the punch body 7 is moved to the punch guide member 3 accordingly. The punch blade portion 5 of the punch body 7 projects downward from the stripper plate 9 as it moves downward. As a result, the punch blade 5 cooperates with the die 43 to punch the punching plate material W.

The piston spring 23 compresses the compressive fluid in the gas filling chamber 37 and moves downward with respect to the cylinder member 21, so that the gas spring 19 generates an upward repulsive force, that is, a stripping spring force. When the striker 33 rises after the punching of the punched plate material W is completed, this punching spring force causes the punch body 7 to move.
The punch blade portion 5 moves upward so as to come out of the punching portion of the die 43 and the punching plate material W.

The punch blade portion 5 is the die 43 and the punched plate material W.
When the punching die 1 comes out of the punching portion, the punching die 1 rises to its original position by the spring force of the lifter spring 15,
The stripper plate 9 is separated from the punched plate material W.

Punch stroke of gas spring 19
The stripping spring characteristic is shown by the solid line in FIG. 2, and the gas spring 19 shows a large rise in the region where the punch stroke is small. The broken line in Fig. 2 indicates the punch stroke when a normal coil spring is used.
The stripping spring characteristics are shown.

As a result, when the stripping spring force is most necessary, that is, when the punch stroke is about 2 to 4 mm,
A large stripping spring force is obtained even when the tip of the punch (punch blade portion 5) is in the middle of the punching portion of the punching plate material W, and the punching blade portion 5 punches the die 43 and the punching plate material W by this large stripping spring force. Stripping that comes out of the part will be performed reliably.

FIG. 3 shows another embodiment of the punching die according to the present invention. Note that, in FIG. 3, portions corresponding to those in FIG. 1 are denoted by the same reference numerals as those in FIG.

In this embodiment, the gas spring 1
9, the piston member 23, the lower rod portion 25, and the upper rod portion 27 are formed hollow, and the stem portion 47 of the punch body 7 penetrates through these hollow portions, and the piston member 23, the lower rod portion 25, and the upper rod portion are penetrated. 27 is fixedly connected to the punch body 7 in such a manner that it is sandwiched between the punch head member 35 screwed to the tip of the stem portion 47 and the punch body 7.

The punch body 7 and the lower rod portion 25
The joining portion 49 with is tapered, so that the punch body 7 and the piston member 23 are automatically and concentrically connected.

Further, the lower bottom surface portion 51 of the punch guide member 3 is directly used as a stripper plate.

Except for the above-mentioned constitution, it is substantially the same as the embodiment shown in FIG. 1, and the punching die 1 of this embodiment is the same.
1 is substantially the same as that of the punching die 1 of the embodiment shown in FIG.

In the above, the present invention has been described in detail with respect to a specific embodiment, but the present invention is not limited to this, and various embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art.

[0029]

As can be understood from the above description, according to the punching die of the present invention, the punch body is pulled out from the die and the punching plate material by the stripping spring force generated by the gas spring, and the punch stroke of the gas spring is obtained. -The stripping spring characteristics are set arbitrarily by adjusting the pressure of the enclosed gas so that a large stripping spring force can be obtained when the stripping spring force is most needed. Stripping is reliably performed under the stripping spring force. Further, in this punching die, the number of component parts is reduced by using the gas spring.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a punching die according to the present invention.

FIG. 2 is a graph showing punch stroke / stripping spring characteristics of a gas spring used in a punching die according to the present invention.

FIG. 3 is a longitudinal sectional view showing another embodiment of the punching die according to the present invention.

[Explanation of reference numerals] 1 punching die 3 punch guide member 15 lifter spring 19 gas spring 21 cylinder member 23 piston member 33 striker 35 punch head member 37 gas filling chamber 43 die

Claims (1)

[Claims] 1. A punching die in which a punch body is movably mounted on a punch guide member, and a gas spring that generates a stripping spring force between the punch guide member and a punch head member above the punch body. The punching die is characterized by being provided with.