JPH079522U - Punch breakage detection mechanism in punch press machine - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a punch breakage detection mechanism capable of quickly and surely detecting punch breakage in a punch press device. In a punch breakage detection mechanism of a punch press device for punching a workpiece using a punch holder 4, a sleeve 1, a punch 3, a die 6 and the like, the conductivity driven by the punch holder 4 is driven. Sex punch parts 1, 3
A conductive die portion 6 for receiving the punched portion and performing a punching process on the workpiece, and the punched portions 1, 3
And a detection means for detecting electrical connection between the punch portion 6 and the punch portion 6, and when the punch portion 3 is damaged, the electrical connection between the punch portion 3 and the die portion 6 is cut off. A punch breakage detection mechanism for detecting breakage of the punched portion was used.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a punch breakage detection mechanism for reliably detecting punch breakage in a press die of a sheet metal punching punch press device.

[0002]

[Prior art]

 If a punch breaks during shearing in a sheet metal punching punch press, if the punching is continued as it is, defective products will naturally appear in the workpiece.

Therefore, when the punch breaks during continuous processing, it is necessary to immediately find it and stop the press machine to prevent the generation of defective products.

However, in the conventional device, for example, a laser displacement sensor is swept to the lower part of the punch to irradiate the laser beam to the tip of the punch each time the shearing process is performed, and the reflected laser beam is applied to the displacement sensor. The output signal, the vertical axis represents the voltage, and the horizontal axis represents the punch tip width as a function. There is known a device for stopping the press device when the press is started.

On the other hand, a shear plate is provided on the side of the striker for hitting the punch, and when the punch press body is overloaded, the shear plate is sheared and a safety device is generally used so that the press body is not loaded. Although provided in the press device, there is also known a device that utilizes this safety device to detect shearing of the shear plate when an overload occurs during processing. A punch breakage detection device of the type that utilizes shearing of such shear plates will be described with reference to FIGS. 6 (a) and 6 (b) and FIGS. 7 (a) and 7 (b).

FIGS. 6 (a) and 6 (b) are operation explanatory views of an apparatus for detecting shearing of the shear plate when an overload occurs during processing, and FIG. 7 (a). (B) shows an operation explanatory view of the detection device by shear plate shearing after shear plate shearing.

As shown in FIG. 6A, a punching part is formed by a punch 31 provided on the upper turret 35 and a die 32 provided on the lower turret 33 that rotates in synchronization with the upper turret 35.

The work piece 34 placed between the punch 31 and the die 32 has the striker 36 descending in the direction of arrow B and hitting the head 31 a of the punch 31 to cause the punch 31 to descend in the direction of arrow B. Then, the workpiece 34 is punched, inserted into a receiving hole (not shown) of the die 32, and then returned to its original position by the restoring force of the spring 46.

Hereinafter, the detection portion by shear plate shearing will be described in detail.

The convex portion 42 is provided at the center of the cylindrical ram 43, and the cylindrical insulating material 40 is provided which is in close contact with the surface on which the convex portion 42 is provided and has the same outer diameter. A cylindrical striker holder 38 having the same outer diameter is provided on a certain back surface.

The ram 43 is held by the ram guide 41 and moves up and down in the directions of arrows A and B.

A striker 36 is provided at the center of the striker holder 38 so as to be movable up and down, and an end portion 36a thereof is provided so as to abut a shear plate described later, and the shear plate is sheared when a constant load is applied. 37 is provided between the backup plate 39 and the striker 36.

The shear plate 37 and the striker 36 are fixed to each other by the bolts 44 so that the projections 42 and the heads of the bolts 44 have a constant space.

The electric circuit shown in FIG. 6B is configured by connecting one end to the conductive ram 43 and the other end to the conductive striker holder 38 via the NC device 45.

Before the conductive striker 36 hits the head 31a of the conductive punch 31, the striker 36 and the head 31a are in non-contact with each other, and as shown in FIG. Has no continuity.

However, as shown in FIG. 7A, when an overload is applied by the press, the striker 36 is pressed in the direction of arrow A, shearing the shear plate 37, and the head of the bolt 44 is projected. Since it contacts the portion 42, as shown in FIG. 7B, electrical continuity occurs in the electric circuit connected to the NC device 45, and the electrical continuity is detected, and measures such as stopping the NC device 45 are taken. Can be taken.

[0017]

[Problems to be solved by the device]

 In such a conventional punch press device, a punch damage detection device that uses a laser displacement sensor is used to sweep the laser displacement sensor at the bottom of the punch every time the punch is operated during punching. The mechanism for sweeping is complicated because the method of detecting the voltage change due to the change of the shape of the punch tip by the reflection of the laser beam from the tip and checking the damage situation of the tip is adopted. However, there is a disadvantage that sweeping each time processing requires extra processing time.

On the other hand, as described with reference to FIGS. 6A and 6B and FIGS. 7A and 7B, in the device that detects shearing of the shear plate when overload occurs, However, the structure in which the shear plate is sheared when an overload occurs has a drawback that the structure for holding the shear plate becomes complicated and the volume of the striker part becomes large.

Further, when the shear plate is sheared, it is necessary to replace the shear plate anew, which causes a problem in that the workability is troublesome.

An object of the present invention is to provide a punch breakage detection mechanism that solves the above problems.

[0021]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a punch damage detection mechanism of a punch press device for punching a workpiece by using a punch holder, a sleeve, a punch, a die, etc. A conductive punch portion driven and driven, a conductive die portion for receiving the punch portion and making a hole in the workpiece, and detecting conduction between the punch portion and the die portion. When the punch portion is broken, the breakage of the punch portion is detected by interrupting the electrical connection between the punch portion and the die portion.

[0022]

[Action]

 According to the above, when normal pressing operation is performed, there is one conduction (conduction between the punch part and the die part) for each pressing operation, but the punch is damaged. In this case, since the conduction between the punch part and the die part is cut off, the breakage of the punch part can be detected quickly and reliably.

[0023]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 (a), 1 (b), 2, 3 (a), 3 (b), 4 (a), (b), 5 (a), and 5 (b). ) Will be described in detail.

FIG. 1 is a partial sectional view of a punch breakage detection mechanism before striking of a striker of the punch press device of the present invention, FIG. 2 is an enlarged view of an X portion indicated by a circle in FIG. 1, and FIG. 3 is a striker of the punch press device. 4 is a partial sectional view of the punch breakage detection mechanism of the present invention after striking, FIG. 4 is an enlarged view of a Y portion indicated by a circle in FIG. 3, and FIG. 5 is a partially enlarged view of a punch breakage state in the mechanism of the present invention. .

As shown in FIG. 1A, the punch breakage detection mechanism of the present invention has a cylindrical sleeve 1 held and fixed by a punch holder 17, the center of the sleeve 1 being the same, and a through hole 18 and The spring holding hole 19 is provided, and the spring 7b is inserted into the spring holding hole 19 so that the spring 7b can be expanded and contracted from the end on the arrow A direction side. Insert slidably in the B direction.

Therefore, the spring 7b is configured so as not to come out by the flange portion provided on the guide 2.

From the end of the through hole 18 on the arrow B direction side, a stripper 5 whose surface is coated with an insulating material or which is made of an electrical insulator is press-fitted and fixed.

As shown in FIG. 2, the stripper 5 is provided so as to penetrate the punch guide hole 20 at the center of the end surface on the arrow B direction side, and the escape hole 2 for the conductive punch 3 is provided on the end surface on the arrow A direction side. 3 is provided.

As shown in FIGS. 1A and 1B, the punch holder 4 is inserted between the punch holder head 4 a and the guide 2 from the end of the through hole 22 provided in the center of the guide 2 on the arrow A direction side. Is inserted through the spring 7a.

The punch holder 4 is for holding the punch 3, and when the punch holder head 4 a is hit by the striker 8, the punch holder 4 moves down in the direction of arrow B and is held at the tip end of the punch 3. Is for penetrating the workpiece 9 to perform a drilling process.

On the other hand, the die 6 held and fixed to the die holder 16 by the die fixture 10 is placed at a position corresponding to the punch 3.

Therefore, when the punch 3 descends in the direction of the arrow B, the punch 3 has a positional relationship of being inserted into the receiving hole provided in the die 6 after drilling the workpiece 9.

One end of the cable 14 is connected to the connecting portion 11 provided on a part of the die 6, the other end is connected to the NC device 13, and the cable 15 is connected to the connecting portion 12 provided on a part of the sleeve 1. By connecting the other end to the NC device 13, the electric circuit 21 shown in FIGS. 1 (a) and 1 (b) is configured.

The operation of the punch breakage detection mechanism of the present invention will be described below.

First, when the striker 8 descends, the punch 3 hits the punch holder head 4 a, and the punch 3 held by the punch holder 4 becomes integral with the guide 2 and the stripper 5 and contacts the workpiece 9 while the spring 7 b is compressed. It descends until it touches.

As shown in FIG. 3 (a), when the striker 8 is further lowered, the spring 7 a is compressed, and the workpiece 9 sandwiched between the die 6 and the stripper 5 is pressed and fixed in a state of being punched. 3 descends, and a hole is drilled at a predetermined position on the workpiece 9.

In this case, it is recognized that the punch 3 and the die 6 come into contact with each other to bring them into conduction as shown in FIG. 3 (b), and a current flows through the electric circuit 21 via the cables 14 and 15.

When the boring process is completed, as shown in FIG. 1A, the punch 3 moves upward in the direction of arrow A by the restoring force of the spring 7a, and the guide 2 rises by the restoring force of the spring 7b. Then return to the original position.

Therefore, as shown in FIG. 1B, the punch 3 and the die 6 are out of contact with each other, and no current flows in the electric circuit.

In the above process, when the punch 3 is damaged when the workpiece 9 is sheared, the striker 8 does not become conductive even after a certain time elapses after the striker 8 operates. As a result, damage to the punch 3 is detected.

Therefore, the damage of the punch 3 can be automatically detected by recognizing the presence or absence of the current flow in one pressing process.

As described above, in the state before hitting the striker, as shown in FIG. 1B, there is no conduction between the punch portion and the die portion. Similarly, as shown in FIGS. 3 (b) and 4 (b), during the pressing operation, the electric circuit is closed and conduction exists.

Further, as shown in FIGS. 5 (a) and 5 (b), in the case of punch breakage, there is no conduction, so the electric circuit is not closed.

[0044]

[Effect of device]

 According to the present invention described above, when normal pressing operation is performed, there is one conduction (conduction between the punch portion and the die portion) for each pressing operation. When the punch is broken, the conduction between the punch portion and the die portion is cut off, so that the punch portion can be reliably detected. Therefore, the defective product is not sent to the next step, and the punch is not damaged by the damaged punch.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a punch breakage detection mechanism before hitting a striker of a punch press device of the present invention.

FIG. 2 is an enlarged view of a portion X in FIG.

FIG. 3 is a partial cross-sectional view of a punch breakage detection mechanism after striker strike of the punch press device of the present invention.

FIG. 4 is an enlarged view of a portion Y in FIG.

FIG. 5 is a partially enlarged view of the mechanism of the present invention with the punch broken.

FIG. 6 is an operation explanatory view of an apparatus for detecting shearing of a shear plate in a conventional punch breakage detecting apparatus of a type utilizing shear plate shearing.

FIG. 7 is an operation explanatory view in a state where the shear plate is sheared in the detection device of FIG.

[Explanation of symbols]

 1 Sleeve 2 Guide 3 Punch 4 Punch Holder 4a Punch Holder Head 5 Stripper 6 Die 7a Spring 7b Spring 8 Striker 9 Workpiece 10 Die Fixture 11 Connection Part 12 Connection Part 13 NC Device 14 Cable 15 Cable 16 Die Holder 17 Punch Holder 18 through hole 19 spring holding hole 20 punch guide hole 21 electric circuit 22 through hole 23 escape hole 31 punch 31a end 32 die 33 lower turret 34 work piece 35 upper turret 36 striker 37 shear plate 38 striker holder 39 backup plate 40 Insulation material 41 Ram guide 42 Convex portion 43 Ram 44 Bolt 45 NC device 46 Spring

Claims (2)

[Scope of utility model registration request] 1. In a punch damage detection mechanism of a punch press device for punching a workpiece using a punch holder, a sleeve, a punch, a die, etc., a conductive punch portion driven by being driven by the punch holder. And a conductive die part for receiving the punched part to perform a punching process on the workpiece, and interrupting the conduction between the punched part and the die part when the punched part is damaged. The damage to the punch portion is detected by the punch damage detecting mechanism of the punch press device. 2. The detecting means according to claim 1, wherein: N
A punch damage detection mechanism of a punch press device, which is a C device.