JP2000202696A - Fitting tool of punch for compacting die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To tighten and fix a punch for compacting die with a uniform force. SOLUTION: Screws 12 different in thread are provided on both end parts of a tightening bar 9 provided orthogonal to the axis of a punch land cylindrical pieces 14 to be continuously connected to one end of a clamping parts 13 are respectively screwed thereto. The tightening bar 9 is in a floating condition. The cylindrical pieces 14 are moved in a symmetric manner in the right-to-left direction by the turning operation of the tightening bar 9, the turning motion is caused in a lever 15 engaged with the cylindrical pieces 14 with its bent part 17 as a supporting point, and a flange 2 of the punch 1 is loosened/ tightened even by the tip 18. The punch 1 can be attached/detached in one operation, and the tightening force becomes uniform in the right-to-left direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixture capable of fastening and fixing a punch for a powder molding die with an equal force.

[0002]

2. Description of the Related Art A conventional method of mounting a punch mounted on a powder molding die apparatus will be described with reference to FIGS. In these figures, a punch 1 is an upper punch with a press surface directed downward, and a flange 2 is formed at a base end portion. A punch plate 3 is mounted on the end of the spindle on the apparatus side, and the punch 1 is mounted on the punch plate.

In FIG. 3, the clamp plate 4 is pressed from below by a fastening bolt 5 and fixed. That is, a screw hole 6 is formed in the punch plate 3, and the clamp plate 4 is pressed upward by screwing the tightening bolt 5 passed through the mounting hole 7 penetrating the clamp plate 4 into the screw hole 6. A part of the central portion of the clamp plate 4 is engaged with the flange 2 so that the punch 1 is pressed and fixed.

In FIG. 4, a clamp plate 4 is pulled up and fixed by tightening bolts 5. That is, a screw hole 6 is formed in the clamp plate 4, and the clamp plate 4 is pulled upward by screwing with the screw hole 6 through a mounting hole 7 penetrating the punch plate 3. A part of the central portion of the clamp plate 4 is engaged with the flange 2 so that the punch 1 is pressed and fixed.

[0005]

In each of the conventional methods described above, a plurality of tightening bolts are sequentially tightened, so that it is not easy to obtain a uniform tightening force. If the balance of the tightening force is poor, the punch is fixed in a slightly inclined state, which may cause chipping of the punch during pressing. In particular, in the case of FIG. 3, the mounting operation from the inside has a problem that a work space is narrow and workability is poor.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and is directed to a fixture for fixing a punch for a powder molding die to a punch plate. In the direction, there is a clamping rod having oppositely threaded parts at both ends, and when this is turned, the clamp parts screwed to each of the threaded parts of the clamping rod move symmetrically to punch. Are fastened and fixed.

Further, the fastening rod is not fixed in the axial direction and the radial direction. Further, the clamp component body has an L-shape, one end of which is engaged with the screw portion of the tightening rod to be moved symmetrically, and the punch is tightened and fixed by the action of a lever having the bent portion as a fulcrum. It is characterized by doing so. The punch is fixed via a clamp piece interposed between the punch part and the clamp piece, and the clamp piece is configured to be openable and closable when there is no load.

By turning the tightening rod having the oppositely threaded portions at both ends, the ends of the clamp components screwed to each other approach or separate symmetrically with the same amount of movement. By converting this symmetrical movement into a movement in the direction of tightening the punch, the punch is simultaneously tightened and fixed with an equal force.

Means for further improving the uniformity are as follows. That is, the clamp component receives a reaction force from the flange of the punch when tightened. If the reaction forces received by the clamp components are not uniform, the clamping rod in the floating state will naturally move to a position where the reaction forces are equal, thereby accurately equalizing the clamping force at both ends.

As a specific means for converting the axial movement of the tightening rod into the movement of the punch in the tightening direction, a clamp component having an L-shaped lever as a main body is employed and tightened by the action of a lever. . By interposing the clamp piece between the punch and the clamp component, the pressing force becomes a distributed load according to the contact surface of the clamp piece, and more stable fixing can be obtained. When no load is applied, the clamp piece can be opened and closed, and when the clamp piece is opened, the punch can be freely moved in the axial direction of the punch, thereby facilitating the attaching / detaching operation.

[0011]

Next, an embodiment of the present invention will be described with reference to the drawings. Note that the same reference numerals are given to the same portions as those in the above-described conventional technology.

In FIG. 1, a mounting hole 8 is provided through a punch plate 3 mounted on a spindle end of a powder molding die apparatus (not shown) in a direction perpendicular to the axis of the punch. A fastening rod 9 is inserted therein. Mounting hole 8
Is set sufficiently larger than the outer diameter of the tightening rod 9,
The tightening rod 9 is in a floating state in which there is no restriction in the axial direction and the radial direction to some extent. Both ends of the tightening rod 9 are provided with mutually different screws 12.

A cylindrical piece 14 which is a part of a clamp component 13 is screwed into each of the screws 12 having different abilities. One end of an L-shaped lever 15 is engaged with the cylindrical piece 14 by a pin 16. The bent portion 17 of the lever 15 is rotatably fixed to the device portion.

In the mounting device configured as described above,
If the fastening rod 9 is turned with a wrench or the like, the left and right cylindrical pieces 14 approach or separate symmetrically. Along with this, the lever 15 performs a rotating motion with the bending portion 17 as a fulcrum.
When the tubular piece 14 is operated to be separated, the lever 15
The punch 1 rotates so as to press the flange 2 of the punch 1 upward, so that the punch 1 is pressed and fixed to the end face of the punch plate 3.

At this time, since the tightening rod 9 is in a floating state, the tightening rod 9 naturally moves to a position where the reaction force received by the distal end 18 of the lever 15 becomes equal on the left and right sides, and the force balance is maintained. First, a uniform tightening force can be obtained by one operation.

FIG. 2 shows an embodiment according to claim 4, in which a clamp piece 11 is interposed between the punch 1 and the lever 15 as compared with the embodiment shown in FIG. Accordingly, the pressing force against the flange 2 is dispersed according to the size of the contact surface of the clamp piece 11, so that the fixing of the punch 1 is further stabilized. The clamp piece 11 can be opened and closed right and left when the lever 15 is loosened.
The attachment / detachment work can be performed smoothly in the axial direction.

[0017]

According to the present invention, since the right and left clamp parts simultaneously fix the punch with an equal tightening force, the punch mounting tool for the powder molding die according to the present invention can be accurately mounted without being inclined with respect to the axis of the punch. Can be. Therefore, interference between the punch and the die is prevented, and chipping due to the interference is avoided. Further, the work of attaching the punch can be performed by a single operation from the side of the apparatus, so that the workability is improved.

[Brief description of the drawings]

FIG. 1 is a front view including a partial cross section showing an embodiment of the present invention.

FIG. 2 is a front view including a partial cross section showing another embodiment of the present invention.

FIG. 3 is a front view including a partial cross section showing a conventional case.

FIG. 4 is a front view including a partial cross section showing another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Punch 3 Punch plate 9 Tightening bar 11 Clamping piece 12 Screw 13 Clamping part 14 Cylindrical piece 15 Lever 17 Bending part 18 Tip of lever

Claims (4)

[Claims] 1. A mounting tool for fixing a punch for a powder molding die to a punch plate, comprising a tightening rod having oppositely threaded portions at both ends in a direction orthogonal to the axis of the punch, A powder molding die, characterized in that the punch is tightened and fixed by symmetrically moving the clamp parts screwed to each of the screw portions of the tightening rod when this is turned. Fixture for punch. 2. The mounting tool according to claim 1, wherein the fastening rod is not fixed in the axial direction and the radial direction. 3. The clamp component body is L-shaped,
2. The punch according to claim 1, wherein one end thereof is engaged with a screw portion of the tightening rod to be symmetrically moved, and the punch is tightened and fixed by an action of a lever having the bent portion as a fulcrum.
Or a mounting tool for the punch for a powder molding die according to claim 2. 4. The punch is fixed through a clamp piece interposed between the punch and the clamp component.
4. The mounting tool for a powder molding die punch according to claim 1, wherein the clamp piece is configured to be openable and closable when there is no load.