JP2001001073A - Die device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a die device having a function to prevent a punched piece from a work from moving upward integrally with a punch. SOLUTION: In the die device 1 where the die 5 is removably fitted to a die holder 3, longitudinal grooves G, reaching to the position close to the die edge 5B fitted at the upper edge part of the punched hole 5H, is provided in appropriate plural positions of the inside surface of a punched hole 5H provided in the die 5, plate springs 21 fitted at the lower part of the die 5 or in a die holder 3 is fitted long in the vertical direction so as to be deflected in the grooves, a catch, projected inward with a inclined part at the upper part thereof is provided at the upper edge of each of the plate spring 21, so as to allow the punched piece to pass through downward, however prevent it to return upward, and the support point of the defection of each of the plate spring 21 is placed near the down part of the plate spring 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die apparatus used for punching a plate-shaped work, and more particularly, to a die, such as a scrap or blank, punched from a work. The present invention relates to a die device having a function of preventing the punch from rising upward and returning to the upper surface of the die when the punch returns.

[0002]

2. Description of the Related Art Japanese Unexamined Utility Model Publication No. 63-66518 (Prior Art 1), Japanese Utility Model Application Laid-Open No. 5-70 is a prior art example of the invention.
No. 725 (Prior Art 2) and Japanese Utility Model Registration No. 2543774 (Prior Art 3).

[0003]

In the above-mentioned prior art 1, as shown in FIG.
1 is provided with a punch dust removing mechanism 103 that elastically presses against the punch 102, so that the punched piece S of the plate-like work 104 is locked with the punch dust removing mechanism 13 by a punch. 102 is the punching hole 1 of the die 100
01, it is necessary to increase the stroke of the ram for pressing the punch 102, which is a problem in improving work efficiency.

[0005] In the above-mentioned prior example 2, as shown in FIG. 5, a circumferential groove 1 is formed on an inner peripheral surface of a punching hole 101 of a die 100.
The ring member 107 provided with a plurality of locking portions 106 that can be bent and deformed on the inner peripheral surface is engaged with the peripheral groove 105, and punching is performed by the locking portion 106 provided on the ring member 107. It is the structure which locks a piece.

According to this configuration, although the penetration of the punch into the punching hole 101 of the die 100 can be suppressed to a small value, the locking portion 106 is easily sheared by the punch, and when the punched piece passes downward. There is a problem in prolonging the service life easily due to repeated bending deformation.

Further, in Prior Example 3, as shown in FIG. 6, a horizontal hole 108 is provided in the die 100 in a direction orthogonal to the punching hole 101 so as to face the horizontal hole 108.
The gripping pin 111 facing the U-shaped connecting pin 109 inserted into the punching hole 101 faces the punching hole 101, and the punched piece is locked by the gripping pin 111.

In this configuration, although the set-up of the connecting pin 109 can be suppressed, the punched piece is to be locked at the arc of the gripping pin 111 having a circular cross section. There is a problem of lack of reliability in locking.

[0008]

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, the present invention relates to a die apparatus in which a die is removably mounted on a die holder. At an appropriate number of locations, a vertical groove is provided to a position close to a die blade provided on the upper edge of the punching hole, and a leaf spring provided at the lower part of the die or the die holder is provided vertically long and the groove is provided in the groove. The plate is provided with a locking claw having an inclined portion at an upper portion and having an inwardly protruding portion so as to allow the punched punched piece to pass downward in a downward direction but to prevent the punching piece from returning upward. It is provided at the upper end of the spring, and the fulcrum of the leaf spring is provided near the lower part of the leaf spring.

[0009]

Referring to FIG. 1, a die apparatus 1 according to an embodiment of the present invention has a configuration in which a die 5 is detachably mounted on a die holder 3.

The die holder 3 is, as shown in FIG.
A die mounting hole 7 in which the die 5 can be removably mounted is provided on the upper part.
A locking ring 11 engaged with a die outer circumferential groove 9 formed on the outer periphery of the die 5 and a locking groove 13 which can be detachably engaged are formed. A positioning pin 17 is provided in the die mounting hole 7 so as to be detachable from a positioning groove 15 (see FIG. 1) formed in the die 5. A positioning key 19 is provided on the outer peripheral surface of the die holder 3 for performing directional positioning when the die holder 3 is mounted on a punch press.

According to the above configuration, when the die 5 is mounted in the die mounting hole 7 of the die holder 3, the positioning groove 15 of the die 5 and the positioning pin 17 are engaged to position the die 5 with respect to the die holder 3. And the locking ring 11 provided on the die 5 is engaged with the locking groove 13 of the die holder 3,
The die 5 is prevented from coming out of the die mounting hole 7 of the die holder 3. When the die 5 is extracted from the die mounting hole 7 of the die holder 3, as shown in FIG. 2, the die 5 is detached with the locking ring 11 provided.

Here, the following structure can be used as a structure for making the locking ring 11 common to each die 5 that is attached to and detached from the die holder 3. That is,
The depth of the locking groove 13 formed in the die mounting hole 7 is made deeper than the depth of the die outer peripheral groove 9 formed in the die 5, and the locking is performed more than the depth of engagement of the locking ring 11 with the die outer peripheral groove 9. When the die 5 is attached to and detached from the die mounting hole 7 by increasing the engagement depth of the locking ring 11 with the groove 13,
The locking ring 11 is always locked in the locking groove 13, so that the locking ring 11 can be commonly used for each die 5 to be detached and replaced.

Prevention of punched pieces S such as scraps and blanks on the upper surface of die 5 when punching plate-shaped work W is performed by cooperation of die 5 and punch P (see FIG. 3). For this purpose, a locking claw for locking the punched piece S is provided.

More specifically, in the die 5, the inner peripheral surface of the punched hole 5H (see FIG. 2) provided in the die 5 is close to the die blade portion 5B provided at the upper edge of the punched hole 5H. A plurality of vertical grooves 5G reaching the position are provided from the lower surface. In the die mounting hole 7 of the die holder 3, a plurality of leaf springs 21 are provided corresponding to the vertical grooves 5G. Since the width of each vertical groove 5G is only slightly larger than the plate thickness of the leaf spring 21 and is relatively narrow, even if the upper portion of each vertical groove 5G is close to the die blade portion 5B, It does not affect the strength of the die blade 5B.

The leaf spring 21 holds the die 5 in the die holder 3
When it is engaged with the die mounting hole 7, it is positioned in the vertical groove 5G as shown in FIG. 1, and its shape is vertical as shown in FIG. The horizontal portion 2 whose width is relatively large with respect to the thickness of the leaf spring 21
A substantially vertical rising portion 21V whose width in the horizontal direction, 1H, is smaller than the vertical width of the horizontal portion 21H, is long in the vertical direction, and the rising portion 21V is flexible so that the upper end portion enters the vertical groove. It is provided in.

Then, above the rising portion 21V,
A locking claw 21C is provided which protrudes inward from the peripheral surface of the punched hole 5H of the die 5. The locking claw 21C is located near the upper portion of the vertical groove 5G and in the vicinity of the die blade portion 5B, and has an inclined portion 21S on the upper side which allows the punched piece S to pass downward. The center side of the punched hole 5H is formed so as to be lower, and the inner end thereof is formed at a sharp end, for example, in the shape of a tongue beak. Although the case where the plate spring 21 is provided on the die holder has been described, the plate spring 21 may be provided directly on the die 5.

In the above configuration, as shown in FIG. 1, after the die 5 is mounted in the die mounting hole 7 of the die holder 3, the punch P is placed on the work W (see FIG. 3) set on the die 5. When the punching process is performed on the punched piece S (FIG. 3A), the peripheral portion of the punched piece S comes into contact with and presses the inclined portion 21S of the locking claw 21C of the leaf spring 21. 21 rises 21V flexes around the joint with the horizontal portion 21H as a flexure fulcrum.
Portion enters the vertical groove 5G (FIG. 3B). Then, when the punched piece S passes through the portion of the locking claw 21C, the locking claw 21C returns to the original position by the elasticity of the leaf spring 21 (FIG. 3C).

Thereafter, when the punch P rises and returns, when the punched piece S tends to rise integrally with the punch P, as shown in FIG. Thus, the upper side of the peripheral edge of the punched piece S is locked to prevent the punched piece S from rising.

As already understood, the locking claw 21C provided at the upper end of the rising portion 21V of the leaf spring 21 is close to the die blade portion 5B of the die 5, so that the punching hole 5H of the die 5 is formed.
However, even if the amount of the punch P penetrated by the punch C is small, the punched piece S can be reliably locked by the locking claw 21C.

The rising portion 21V of the leaf spring 21 bends with the vicinity of the connection with the horizontal portion 21H as a bending fulcrum. Since the locking claw 21C is largely separated from the bending fulcrum, it is long. Even when used for a long time, the set of the leaf spring 21 is small and the life is long.

[0021]

As will be understood from the above description, according to the present invention, a punched piece of a plate-shaped work after punching can be reliably locked and held inside the die, and the above-described punching can be performed. It is possible to achieve a long life without causing settling of the locking claw for locking the piece. Therefore, the conventional problem as described above can be solved.

[Brief description of the drawings]

FIG. 1 is a plan explanatory view and a sectional explanatory view showing a state where a die is mounted on a die holder.

FIG. 2 is an explanatory cross-sectional view in a state where a die is separated from a die holder.

FIG. 3 is an operation explanatory view showing a state in which a punched piece punched from a work is locked by a locking claw of a leaf spring.

FIG. 4 is an explanatory view of a conventional die device according to Prior Art 1.

FIG. 5 is an explanatory diagram of a conventional die device according to Prior Example 2.

FIG. 6 is an explanatory view of a conventional die device according to Prior Example 3.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Die apparatus 3 Die holder 5 Die 5H Punching hole 5B Die blade part 5G Vertical groove 7 Die mounting hole 11 Locking ring 13 Locking groove 21 Leaf spring 21C Locking claw 21S Inclined portion

Claims (1)

[Claims] 1. A die device comprising a die holder removably mounted on a die holder, a die blade portion provided at an appropriate number of locations on an inner peripheral surface of a punched hole provided in the die, at an upper edge of the punched hole. And a plate spring provided in the lower part of the die or in the die holder is provided vertically long and is flexibly provided in the groove, so that a punched punched piece passes downward. A tongue is provided at the upper end of the leaf spring with an inwardly projecting locking claw having an inclined portion at the top so as to prevent upward return, and a bending fulcrum of the leaf spring is A die device provided near a lower portion.