JPH0719640Y2 - Mold locking device for forging machine - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to a locking device for a die such as a die or a punch in a forging machine for forging bolts, nuts and various other parts.

[Prior art]

A die in a press forming machine such as a bolt former is inserted into a through hole formed in a machine base or a ram and fixed by a lock member inserted from an angle direction intersecting the through hole. Further, in order to facilitate the exchange of the die or to make it suitable for automatic exchange, for example, as shown in JP-A-60-162545 or 63-281739, a semi-finished die is formed on a part of the peripheral surface of the die. A means for locking by engaging a rod-shaped pin inserted into and removed from the outside into the circular locking groove is adopted.

[Problems to be solved by the invention]

By the way, the engaging pin according to the disclosure is a mere rod-shaped body having a constant diameter, and the engaging groove formed on the outer periphery of the die for engaging the engaging pin with the axial center of the die. Since they are formed at right angles, therefore, if there is a dimensional error between them, not only will the locking be incomplete, but the above-mentioned engaging pin will simply lock the mold, The die cannot be finely adjusted in the axial direction by the dowel pin.

The present invention was made by paying attention to the fact that the engaging pin and the outer periphery of the mold are both circular, and the centering is automatically performed by slightly rotating the mold when locked by the engaging pin. The purpose is to make it possible to adjust the axial direction of the mold by curling.

[Means for solving problems]

In the lock device of the forging machine of the present invention, a circular mold having a circular outer periphery fitted into a holding hole of the fixture so as to be able to be inserted and removed from the front is inserted into an engaging groove provided on the outer periphery of the mold. In a die lock device of a press forming machine, which is adapted to be fixed by engaging a lock pin having a circular cross section inserted through a hole, an engaging groove of the die is axially directed to one side of a peripheral surface of the die. Is formed as an inclined surface that gradually increases in depth, and further, the lock pin has a tapered surface which has a circular cross section and can be brought into close contact with the engaging groove, and the lock pin is formed on the side surface of the mold. It is characterized in that it is inserted so as to be able to move forward and backward into a through hole formed in the fixture in a direction orthogonal to the axial direction of the mold so as to expose the peripheral surface.

[Action]

According to the present invention, when the required die is inserted into the holding hole of the forging machine, the engaging groove formed on the side of the die is made to substantially correspond to the through hole for inserting the lock pin. Then, when the lock pin is inserted into the through hole, both the mold and the lock pin can be rotated, so that the mold and the lock pin are both slightly rotated, so that the mold is automatically aligned and accurately positioned at a predetermined position. You can lock onto. Further, since the locking groove of the die is formed as an inclined surface that increases in depth in the axial direction, if the stopper is screwed into the through hole in the upper part of the lock pin so that the stopper can move forward and backward, the stopper moves forward and backward. Thus, the depth of insertion of the lock pin into the through hole can be adjusted, and the die can be retracted backward (or, conversely, advanced) within the required hole. The mold can be removed by retracting the lock pin from the through hole.

(Embodiment) Hereinafter, the present invention will be described with reference to an embodiment shown in the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a die as a die used in a forging machine, and the die has a cylindrical outer shape, and an axially intermediate outer peripheral surface has an arcuate shape when viewed from the front. A locking groove 1 ', which is an inclined surface that gradually increases in depth in the axial direction, is formed in an appropriate angle range, and is fitted from the front into a holding hole 3 provided in a fixture 2 such as a case or a block. Is held. Reference numeral 4 is a through hole which is provided in the fixture 2 in a direction orthogonal to the axis of the mold 1 so as to expose the circumferential side portion of the mold 1 in which the locking groove 1'is formed. A lock pin is inserted so that the lock pin can be moved back and forth in the axial direction of the through hole and can be slightly rotated. The lock pin 7 has a circular cross section and a tapered surface 7a which is in close contact with the inclined surface of the locking groove 1'is formed on the side surface of the tip end which projects into the through hole 4. The pin is inserted into and held in the vacant chamber 6 of the housing 5 provided in the fixture 2 by screwing the guide tube 5a into the through hole 4 so as to measure the forward and backward movements from the outside. The lock pin head 7b is pressed by a spring 8 housed in the empty space 6 between the lock pin 5 and the stopper lid 5b of the housing 5, and the lock pin 7 is provided with an anti-spring 8 of the head 7b. The fluid pressure from the trachea 9 opened in the hollow space 6'resists against the spring 8. The guide tube 5a of the box 5 has a recessed portion 5c on the corresponding surface of the mold 1, and the lock pin 5 has a key groove 7c provided on the head 7b and a shaft of the box 5. The direction protrusion 5d is engaged with a slight allowance in the circumferential direction. 10 is a stopper screwed from the other end of the through hole 4 to the leg portion.
The degree of insertion into the through hole 4 of the lock pin 7 can be finely adjusted via 10 '.

According to the above configuration, when the mold 1 is first removed from the fixture 2, when air is sent into the empty chamber 6 ', the lock pin 7 is lowered against the spring 8 and the locking groove 1'is formed. The engagement is released and the mold can be pulled out forward. Further, when mounting the die, the die is fitted into the holding hole 3 in such a manner that the lock pin 7 is lowered and the locking groove 1 ′ substantially corresponds to the through hole 4 as described above. After that, when the air is removed, the lock pin 7 is urged upward by the spring 8 and the tapered surface 7a of the pin is engaged with the locking groove 1'to lock the mold. At the time of locking, the mold 1 and the lock pin 7 each have a circular outer periphery and can rotate within the guide tube 5a of the holding hole 3 and the casing 5, respectively, so that the locking groove of the mold is formed. Even if 1 ′ and the taper surface 7a of the lock pin do not exactly coincide with each other initially, when the lock pin 7 is raised, the two are slightly rotated, so that the mold rotates in the self-aligning manner. The reliable fitting is achieved.

The lock pin 7 is biased in one direction by the spring 8. Therefore, if the stopper 10 is screwed onto the upper part of the through hole 4 so as to be able to move forward and backward, the mold 1 can be moved forward and backward appropriately. It is possible to adjust the degree of fitting of the mold into the holding hole by advancing and retracting in the axial direction at any time.

In the above embodiment, the die 1 is an example of a die, but the die may be a punch as long as the outer circumference is circular.

(Effect of the Invention) According to the present invention, the tip end of the lock pin having a circular cross section to be engaged with the locking groove provided on the outer peripheral surface of the mold is formed with a tapered surface on the side surface of the lock pin so as to be in close contact with the locking groove Therefore, when the lock pin is inserted, the die having a circular outer periphery and the lock pin are automatically turned slightly so that the two can be closely contacted with each other and the die can be completely locked. . When the stopper is screwed into the through hole in the upper portion of the lock pin so as to be able to advance and retreat, the fitting depth of the die into the holding hole can be adjusted by moving the stopper forward and backward.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of an essential part of the device of the present invention, and FIG. 2 is a sectional view taken along the line AA in FIG. 1 is a mold, 1'is a locking groove, 2 is a fixture, 3 is a holding hole, 4
Is a through hole, 7 is a lock pin, 7a is a tapered surface, and 10 is a stopper.

Claims (2)

[Scope of utility model registration request] 1. A circular cross-section obtained by inserting a die having a circular outer periphery fitted into a holding hole of the fixture from the front side into an engaging groove provided on the outer periphery of the die through a through hole of the fixture. In a die lock device of a forging machine adapted to be fixed by engaging with a lock pin of the die, the inclination of the engagement groove of the die gradually increasing in the axial direction toward one side of the peripheral surface of the die. The lock pin is formed as a surface, and further, the tip end of which the cross section is circular has a tapered surface which can be in close contact with the engaging groove, and the lock pin exposes the peripheral surface of the mold. A mold lock device for a forging machine, wherein the mold lock device is inserted so as to be able to advance and retract into a through hole formed in a fixture in a direction orthogonal to the axial direction of the mold. 2. A metal for a forging machine according to claim 1, wherein a stopper for regulating the upward movement of the lock pin is screwed into the through hole in the upper portion of the lock pin so as to be adjustable forward and backward. Mold locking device.