JPH0328964B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a die clamper for setting a die on a slide, bolster, etc. in a press machine, and more specifically to a die clamper for setting a die on a slide, bolster, etc. in a press machine, and more specifically, for changing a die with a simple operation using a hydraulic mechanism. Regarding the die clamper that can be used.

Prior Art and Problems Theretofore, a wide variety of types of clampers have been proposed and actually used, but a typical example is one in which the die fixing means is tightened with bolts. There is something to attach the die to.

However, this type of clamper requires complicated manual work when exchanging the die, and requires many accessory parts, leading to high costs. Further, in the case of this type of clamper, since the distance from the die mounting position to the processing area is long, it is difficult to accurately position the die at the proper position when the die is mounted.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a die clamper that can perform die replacement easily and reliably.

Means for Solving the Problems As shown in the attached drawings, the die clamper according to the present invention includes a casing 1 having a cylinder portion 1a at the top and a positioning guide hole 1b at the bottom.
A piston 2 that is fitted inside the cylinder portion 1a and is moved up and down by hydraulic pressure, and a push spring 3 that urges the descended piston 2 upward are housed. A plurality of clamp pieces 4 having a portion 4a and an inner protrusion 4b at the upper end are attached with each claw portion 4a protruding downward from the rod 8, and the inner protrusion 4b Annular groove 8 of the piston rod 8
The claw portion 4a can be freely opened and closed in the radial direction by being hooked to the clamp portion a, and each of the clamp pieces 4 in an open state is slid to close as the clamp pieces 4 rise in the lower part of the casing 1. A sliding contact member 5 is provided, and the neck 7a of the shank 7 screwed onto the die 6 is
The claw portion 4 of each clamp piece 4 that closes as it rises
a, and the upper protrusion 6a of the die 6 is fitted into the guide hole 1b of the casing 1.

In a preferred embodiment of the present invention, the upper end of each clamp piece 4 is urged inwardly by the elastic ring 12, so that the lower end of each clamp piece 4 is urged outward. ing.

In this specification, regarding the inside-outside direction, the axial direction of the radial direction is referred to as "inward", and the opposite direction is referred to as "outward".

Embodiments Next, embodiments of the present invention will be specifically described based on the drawings.

A clamper casing 1 according to the invention is provided on the underside of the slide of the press machine. The casing 1 has a cylinder portion 1a at the top and a positioning guide hole 1b at the bottom.
A top wall 10 is fixed to the upper end of the casing 1 with bolts 9, and a hydraulic pressure passage 11 is provided through the side protrusion 1c of the casing 1 and the top wall 10 to the cylinder portion 1a. Inside the casing 1, a piston 2 fitted into a cylinder portion 1a and a push spring 3 disposed below the piston 2 are housed. The push spring 3 is composed of a plurality of disc springs wound around the piston rod 8, and is interposed between the piston 2 and a horizontal portion of a sliding contact member 5, which will be described later. Piston 2 is
Oil is press-fitted into the cylinder portion 1a so as to overcome the biasing force of the push spring 3, thereby causing the cylinder portion 1a to be lowered. Further, the push spring 3 returns the lowered piston 2 to its original height as the hydraulic pressure is released.

An annular groove 8a surrounding the outer periphery is formed in the lower part of the piston rod 8, and a plurality of clamp pieces 4 are provided. Each clamp piece 4 has a claw part 4a provided on the inside of the lower end, an inward protrusion 4b provided on the inside of the upper end, and an outer protrusion 4c provided on the outside of the lower end.
and an intermediate connecting portion 4d. Each clamp piece 4 has its inner protrusion 4b latched in a pressure-contact manner within the annular groove 8a of the piston rod 8 by an elastic ring 12 provided on its outer periphery. The piston rod 8 is attached to the piston rod 8 with the piston rod 8 projecting downward from the piston rod 8. Boundary portion 4 between claw portion 4a of each clamp piece 4 and connecting portion 4d
e is received by the shoulder 8b of the piston rod 8 and acts as a fulcrum. As a result, the claw portion 4a of each clamp piece 4 can be freely opened and closed in the radial direction, and the outer surface of the lower end of each clamp piece 4 is urged outward by the action of the elastic ring 12, so that sliding contact, which will be described later, is achieved. It is always in contact with the corner 5a at the inner lower end of the member 5.

A sliding contact member 5 made of a toric body having an inverted L-shape in cross section is provided at the inner lower portion of the casing 1 . Then, as the piston 2, piston rod 8, and each clamp piece 4 are raised within the casing 1 by the release of hydraulic pressure from the cylinder portion 1a and the urging force of the compression spring 3, the sliding member 5 is opened. Each clamp piece 4 in the state is slid inward in the radial direction so as to be closed. Further, each clamp 4 is completely closed by causing the inner circumferential surface 5b to slide upward on the outer surface of the outer protrusion 4c of each clamp piece 4.

Upper protrusion 6 of die 6 to be attached to a press machine
In a, a shank 7 having a neck portion 7a on the outer periphery of the upper end is shown.
is screwed on. As shown in FIG. 2, the neck portion 7a of the shank 7 is fastened by the claw portion 4a of each clamp piece 4, which closes as it rises. At the same time, the upper protrusion 6a of the die 6
The die 6 is tightly fitted into the positioning guide hole 1b, and the die 6 is positioned at the proper mounting position. In this way, the die 6 is securely attached to the press machine.
A knockout bar 13 is inserted through the axial center of the die 6. A spacer 14 is provided on the upper surface of the die 6 to adjust the dimensions when the die is attached.

When removing the die 6, as shown in FIG. The fastening between the portion 4a and the neck portion 7a of the shank 7 is released.

Functions and Effects of the Invention Since the die clamper according to the present invention is configured as described above, the claw portion 4a of each clamp 4 and the shank can be connected simply by applying hydraulic pressure to the cylinder portion 1a and releasing hydraulic pressure from the cylinder portion 1a. The die 6 can be fastened to and released from the neck portion 7a of the die 6, and therefore the die 6 can be replaced easily and reliably.

Moreover, since the upper protrusion 6a of the die 6 is fitted into the positioning guide hole 1b of the casing 1 as the die 6 rises, the die 6 can be mounted in a state where it is always accurately positioned at the normal mounting position.

[Brief explanation of drawings]

The drawings show embodiments of the invention,
FIG. 1 is a vertical longitudinal sectional view showing the state before die attachment, and FIG. 2 is a vertical longitudinal sectional view showing the state after die attachment. 1...Casing, 1a...Cylinder part, 1
b...Guide hole, 2...Piston, 3...Press spring, 4...Clamp piece, 4a...Claw portion, 4b...
Inner protrusion, 5... sliding contact member, 6... die, 6a...
...Upper projection, 7...Shank, 7a...Neck, 8
...Piston rod, 8a...Annular groove, 12...
...elastic ring.

Claims (1)

[Scope of Claims] 1. In a casing 1 having a cylinder part 1a in the upper part and a positioning guide hole 1b in the bottom part, a piston 2 fitted inside the cylinder part 1a and moved up and down by hydraulic pressure, The piston 2
The piston rod 8 is surrounded by a plurality of clamp pieces 4 having a claw portion 4a on the inside of the lower end and an inward protrusion 4b on the upper end. The piston rod 8 is mounted with each claw portion 4a protruding downward from the piston rod 8, and the inner protrusion 4b is attached to the annular groove 8 of the piston rod 8.
The claw portion 4a can be freely opened and closed in the radial direction by being hooked to the clamp portion a, and each of the clamp pieces 4 in an open state is slid to close as the clamp pieces 4 rise in the lower part of the casing 1. A sliding contact member 5 is provided, and the neck 7a of the shank 7 screwed onto the die 6 is
The claw portion 4 of each clamp piece 4 that closes as it rises
a, and the upper protrusion 6a of the die 6 is fitted into the guide hole 1b of the casing 1. 2 The upper end of each clamp piece 4 has an elastic ring 12
2. The die clamper according to claim 1, wherein the lower end of each clamp piece 4 is biased outward by being biased inwardly.