JPH0231210Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a punching mold used in a punching machine such as a turret punch press or a punch press.

[Technical background of the invention and its problems] Conventionally, punching machines such as turret punch presses and punch presses are generally equipped with a punch head 3 at the upper end of a punch body 1 and a guide 5 around the lower part, as shown in FIG. A punching die 7 is used in which a strong stripping spring 7 is interposed between the punch head 3 and the guide 5. In order to fix the stripping spring 7, a punch head collar 9 is provided on the punch head portion 3 side, and a retainer collar 11 is provided on the guide 5 side. A punch head collar 9 is fixed to the punch head portion 3 with screws 13, and a retainer collar 11 is attached to the guide 5 with an O-ring 15.
Note that a punch key 17 is provided to prevent the guide 5 from rotating with respect to the punch body 1.

However, in the case of such a conventional punching die, when punching is performed by striking the punch head portion 3 with a striker, the force in the rotational direction of the stripping spring 7 is transferred to the punch body 1 via the retainer collar 11. This movement acts to rotate the punch key 17 fixed to the punch body 1. Since the guide 5 is usually fixed so as not to rotate by the key of the punching machine, the above-mentioned rotational force places a load on the punch key 17, causing the problem of wear and tear on the key.

[Purpose of the invention] This invention was made in view of the above-mentioned problems in the prior art. Equipped with a thrust bearing, it prevents the rotational force when the stripping spring expands and contracts from being transmitted to the punch body and guide, prevents rotational misalignment between the punch body and guide, and prevents wear and damage of the punch key. The purpose of the present invention is to provide a punching die that achieves this.

[Structure of the invention] This invention includes a punch head portion which is struck by a striking element at the upper part of the punch body, a guide is attached around the lower part, and a stripping spring is provided between the lower surface of the punch head and the upper end surface of the guide. In the case of a punching die having an interposed punching die, a thrust bearing is provided between either or both of the lower surface of the punch head and the upper end of the stripping spring, and between the upper end surface of the guide and the lower end of the stripping spring. The gist is a punching die made of.

[Embodiment of the invention] Figures 2 and 3 show the entire turret punch press, in which a large number of punching dies 21 are attached to the upper turret 19, and each of these dies is attached to the lower turret 23. A die 25 corresponding to the punching die 21 is attached. Upper and lower turrets 1
9 and 23 are rotated to bring and position a desired set of a large number of pairs of punching molds 21 and dies 25 directly below the striking element 27.

The carriage base 3 to which the carriage 31 to which the material gripping device 29 is attached moves the carriage 31 to which the material gripping device 29 is attached back and forth to move the desired processing portion of the workpiece W held by the material grasping device 29 to the desired processing area.
In combination with the movement in the left and right direction of step 3, it is brought directly under the striking element 27 and positioned between the punching die 21 and the die 25.

After positioning the pair of punching mold 21 and die 25 and positioning the processing part of the workpiece W,
By striking the punch head portion of the punching die 21 with the striking element 27, punching is performed in a desired shape according to the combination of the punching die 21 and the die 25.

The attachment relationship between the punching mold 21 and the die 25 will be explained in more detail based on FIG.
It is rotatably supported by a frame 39 at. The upper turret 19 is provided with a plurality of punch insertion holes 41 spaced apart appropriately on the same circumference so as to penetrate in the vertical direction. A punching die 21, a tapping device, and other tools are fitted into each punch insertion hole 41.

A donut-shaped die device plate 43 is attached to the lower turret 23. This die mounting plate 43 is provided with a plurality of die mounting holes 45 for mounting the die 25 therein.
5 is installed.

One embodiment of a punching die 21 is shown in FIG. In this punching die 21, a punch head portion 49 is screwed into the upper end of a punch body 47, and a guide 51 is attached around the lower portion. A strong stripping spring 53 is interposed between the lower surface of the punch head 49 and the upper end of the guide 51.

To explain in more detail the support for the stripping spring 53, the punch head portion 49
A punch head collar 55 is attached to the side by screws 57. A retainer collar 59 is attached to the guide 51 side with an O-ring 61. Furthermore, a thrust bearing 63 is mounted on the lower surface of the punch head collar 55, a thrust bearing 65 is similarly mounted on the upper surface of the retainer collar 61, and a stripping spring 53 is mounted between the two thrust bearings 63, 65.
It has an interposed shape.

Note that the punch body 47 is provided with a punch key 67, which engages with a key groove 69 provided in the guide 51 to prevent displacement of the punch body 47 and the guide 51 in the rotational direction.

The punching die 21 is attached to the punch insertion hole 41 of the upper turret 19 of a turret punch press, and a more detailed explanation thereof will be given with reference to FIG. A spring 71 is installed in the punch insertion hole 41.
A guide 51 of the punching die 21 is supported by the spring 71. Further, a key 75 on the turret 19 side engages with a key groove 73 provided on the outer periphery of the guide 51 to prevent the punching die 21 from rotating within the punch insertion hole 41.

Next, the operation of the punching die 21 having the above configuration will be explained. As shown in FIG. The die 25 and the guide 51 are brought into contact with each other with the material W in between. By the impact of the striking element 27, the punch body 47 is further lowered against the force of the strong stripping spring 53, and the material W is punched out.

After this punching, the strong stripping spring 53 works first to strip the punch body 47 of the material W.
Pull up from. Subsequently, the entire punching die 21 is pushed up by the force of the spring 71 and returns to its original position. As shown in FIG. 1, when the punch head 49 is struck by a striker and the stripping spring 53 is compressed, the stripping spring 47 is compressed in the vertical direction and generates a force in the rotational direction. This rotational force is absorbed by the rotation of the upper and lower thrust bearings 63, 65, and the rotational force is prevented from acting on the punch body 47 and guide 51. Therefore, the punch key 67 provided between the punch body 47 and the guide 51 is not damaged.

In the above embodiment, thrust bearings are provided at two locations, upper and lower, but if the rotational force of only one stripping spring can be absorbed, it is possible to provide this thrust bearing only at one of the upper and lower locations. is also possible.

[Effects of the invention] In this invention, a thrust bearing is interposed in either or both of the lower surface side of the punch head portion of the punch body and the upper end surface side of the guide to receive the stripping spring.
Therefore, the rotational force generated by the stripping spring during punching operation can be absorbed by the thrust bearing, and the force that causes rotational misalignment between the punch body and the guide can be prevented, and the punch key provided on the punch body can be rotated. Damage due to misalignment can be reliably prevented.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an embodiment of this invention, Fig. 2 is a front view of a turret punch press using the punching die of the above embodiment, and Fig. 3 is a turret part showing the turret punch press. FIG. 4 is a partially broken front view and a sectional view of a conventional punching die. 21... Punching mold, 47... Punch body, 49... Punch head section, 51... Guide,
53... Stripping spring, 55... Punch head collar, 59... Retainer collar, 6
7...Punch key, 63, 65...Thrust bearing, 67...Punch key.

Claims (1)

[Scope of utility model registration request] A punching die comprising: a punch head section which is struck by a striking element at the upper part of the punch body; a guide is attached around the lower part; and a stripping spring is interposed between the lower surface of the punch head and the upper end surface of the guide. A punching die comprising a thrust bearing installed between one or both of the lower surface of the punch head and the upper end of the stripping spring, and between the upper end surface of the guide and the lower end of the stripping spring.