JPH0649390Y2 - Grip die clamping mechanism in forging machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a grip die clamping mechanism in a forging machine.

(Prior Art) An example of a conventional forging machine is shown in FIG. 5 and FIG.
The figure is a top view showing a partial cutaway, and FIG.
FIG. 6 is a sectional view taken along line VI-VI.

In FIGS. 5 and 6, 01 is a heading die and 02
Is a fixed grip die and 03 is a movable grip die. The movable grip die 03 is reciprocated toward the fixed grip die 02 fixed to the main body 05 by being driven via the crank mechanism 04.

Molds 02a and 03a are fixed to the facing surfaces of the fixed grip die 02 and the movable grip die 03, respectively.
A plurality of recesses 07 for contacting the outer peripheral surface of the work 06 from both sides and shaping the outer contour of the work 06 into a desired shape are provided at intervals on the opposite surfaces of the work 3a.

The heading die 01 includes a holder 01a and a plurality of slide punches 01b supported by the holder 01a and protruding to the front surface thereof.
Crank mechanism driven in synchronization with the crank mechanism 04
Slide punch 01b by being reciprocated via 08
Is projected and retracted inside the work 06 held by the molds 02a and 03a to shape the inner contour of the work 06 into a desired shape.

As shown in FIG. 4, the fixed grip die 02 and the movable grip die 03 are installed in a recess 05a formed in the main body 05 via a mold liner 013. Next, the stud bolt 010 planted in the main body 05 is passed through the hole 011a formed in the center of the pressing piece 011 and the rear end of the pressing piece 011 is placed on the upper surface of the main body 05.
Place the washer 012 on the protruding end of the stud bolt 010 while the front end of the presser piece 011 is in contact with the pressing surface of the grip dies 02, 03.
The nut 013 was screwed and fastened via.

(Problems to be solved by the invention) In the above-mentioned conventional mechanism, every time the grip dies 02 and 03 are replaced, the nut 013 is unscrewed by using a tool such as a wrench to remove the nut 013 and the washer 012 from the stud bolt 010. After removing the pressing piece 011 from the stud bolt 010, the grip dies 02 and 03 are taken out from the recess 05a.

After that, since the other grip dies 02 and 03 to be replaced were attached in the reverse order of the above, there was a problem that the replacement of the grip dies 02 and 03 consumes a lot of trouble and time.

(Means for Solving Problems) The present invention has been proposed to address the above problems, and the gist thereof is in the front-rear direction formed in the central portion of the presser piece 3. The tip thread portion 4b of the stud bolt 4 penetrating the long slot 12 is screwed into the main body 2 so that the stud bolt 4 is planted in the main body 2 and the pressing piece 3
By moving forward and backward, the front end lower surface 3c of the pressing piece 3 is loaded on the pressing surface 1a of the grip die 1 installed in the recess 2a formed in the body 2,
The second fluid pressure cylinder 6 for switching the front end lower surface 3c of the pressing piece 3 to the rear unclamp position where it is separated from the pressing surface 1a, and the rear part of the pressing piece 3 is moved up and down, and the pressing piece 3 is clamped. When in the position, the rear portion of the pressing piece 3 is pushed upward to push the pressing piece 3 into the stud bolt 4
A clamp die clamp for a forging machine, characterized in that a first fluid pressure cylinder (5) for pressing and clamping the grip die (1) by the front end lower surface (3c) of the pressing piece (3) by rotating the bolt head (4a) as a fulcrum is provided. It is in the mechanism.

(Operation) Since the present invention has the above configuration, the pressing piece 3 is expanded and contracted by expanding and contracting the second fluid pressure cylinder 6 with the rear portion of the pressing piece 3 being moved downward by the first fluid pressure cylinder 5. Can be moved forward and backward. And the presser piece 3
Is in the advanced clamp position, the first fluid pressure cylinder 5 pushes the rear portion of the pressing piece 3 upward to rotate the pressing piece 3 with the bolt head 4a of the stat bolt 4 as a fulcrum. The pressing surface 1a of the grip die 1 is pressed by the lower surface 3c of the front end to clamp the grip die 1 in the recess 2a.

(Embodiment) One embodiment of the present invention is shown in FIGS.

1 to 3, reference numeral 1 denotes a fixed or movable grip die, which is installed in a recess 2a formed in the main body 2 through a mold liner 17.

A pressing piece 3 is provided with a recess 3a on the lower surface of the rear portion thereof, and a long hole 12 is formed on the front upper surface 3b in the front-rear direction.

Reference numeral 5 is a first fluid pressure cylinder composed of a hydraulic cylinder or the like housed in the recess 3a, and its piston 5a is a recess 3a of the pressing piece 3.
Abut on the top surface 3c of the cylinder via the cap 16 and
Is fixed to the upper surface 2b of the main body 2.

6 is a second fluid pressure cylinder such as an air cylinder,
The piston 6a is pivotally attached via a pin 10 to a bracket 8 fixed to the inner surface of a connecting plate 7 that interconnects the rear ends of a plurality of pressing pieces 3 arranged side by side, and its cylinder 6b is the upper surface of the main body 2. It is pivotally attached via a pin 11 to a bracket 9 fixed to 2b.

Reference numeral 4 denotes a stud bolt, which penetrates an elongated hole 12 formed in the pressing piece 3, and a threaded portion 4b at its tip is screwed into a screw hole 2c formed in the upper surface 2b of the main body 2 and the bolt head 4a contacts the upper surface 3b of the pressing piece 3 via the washer 13. 14 is a bush,
The upper surface of the stud bolt 4 is locked by the screw 15
14a has the same height as the pressing surface 1a of the grip die 1. The upper surface of the washer 13 is a spherical surface that is concave downward,
The stud bolt 4 is adapted to be in sliding contact with the lower spherical surface of the bolt head 4a.

Then, in normal time, as shown in FIG. 1 and FIG.
When the second fluid pressure cylinder 6 is shortened, the pressing piece 3 moves forward and its lower surface 3c at the front end is the pressing surface of the grip die 1.
It occupies the clamp position loaded on top of 1a. And
The first fluid pressure cylinder 5 extends and pushes the rear portion of the pressing piece 3 upward, whereby the pressing piece 3 is moved to the stud bolt 4
The bolt head 4a is pivoted clockwise as a fulcrum, and the pressing surface 1a of the grip die 1 is pressed downward by the lower surface 3c of the front end thereof to clamp the grip die 1 in the recess 2a for fixation.

To replace the grip die 1, this is shortened by draining the pressure fluid from the first fluid pressure cylinder 5. Then, when the pressure fluid is supplied to the second fluid pressure cylinder 6 to extend the pressure fluid, the stud bolt 4 moves in the elongated hole 12 at the same time as the pressing piece 3 moves backward, and the lower surface 3c of the front end of the pressing piece 3 moves. The grip die 1 separates from the pressing surface 1a and moves to the upper surface 14a of the bush 14 to occupy the state shown in FIG. 2, that is, the unclamped position. Then, the grip die 1 is taken out from the recess 2a of the main body 2.

Next, after another grip die 1 to be replaced is installed in the recess 2a, the second fluid pressure cylinder 6 is shortened to move the pressing piece 3 forward, and then the first fluid pressure cylinder 5 is extended. Then, the pressing piece 3 rotates clockwise around the bolt head 4a as a fulcrum, and the front end lower surface 3c presses the pressing surface 1a of the grip die 1 downward.

In the above embodiment, the pressing piece 3 is moved backward by extending the second fluid pressure cylinder 6, but the pressing piece 3 is moved forward by extending the second fluid pressure cylinder 6. Can be

(Effect of the Invention) In the present invention, the second fluid pressure cylinder 6 is moved with the rear portion of the pressing piece 3 being moved downward by the first fluid pressure cylinder 5.
The presser piece 3 can be moved back and forth by expanding and contracting. When the pressing piece 3 is in the advanced clamp position, the rear part of the pressing piece 3 is pushed upward by the first fluid pressure cylinder 5 to rotate the pressing piece 3 with the bolt head 4a of the stat bolt 4 as a fulcrum. Thus, the pressing surface 1a of the grip die 1 can be pressed by the lower surface 3c of the front end of the pressing piece 3 to clamp the grip die 1 in the recess 2a.

Therefore, it is not necessary to screw or unscrew the nut to the upper end of the stud bolt using a tool as in the conventional case, and the pressure fluid is supplied to and discharged from the first fluid pressure cylinder 5 and the second fluid pressure cylinder 6. By this, the presser piece 3 is moved forward and backward, and
Since the grip die 1 can be pressed or the pressing force can be removed by the front end 3c of the pressing piece 3, it is possible to replace the grip die 1 easily and quickly without using any tool.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention. FIG. 1 is a sectional view taken along line II of FIG. 3, and FIG. 2 corresponds to FIG. 1 when the pressing piece 3 is retracted. 3 is a top view. 4 to 6 show a conventional example, FIG. 4 is a partial sectional view taken along the line IV-IV of FIG. 5, and FIG. 5 is a top view showing a part of the forging machine by cutting out. FIG. 6 is a sectional view taken along the line VI-VI in FIG. Body …… 2, recess …… 2a, grip die …… 1, pressing surface …… 1a, pressing piece …… 3, slotted hole …… 12, stud bolt…
... 4, first fluid pressure cylinder ... 5, second fluid pressure cylinder ... 6

Claims (1)

[Scope of utility model registration request] 1. A threaded portion 4b at the tip of a stud bolt 4 which penetrates an elongated hole 12 formed in a central portion of a pressing piece 3 and which is long in the front-rear direction.
This stud bolt 4 is planted in the main body 2 by screwing the stud bolt to the main body 2, and the pressing piece 3 is moved forward and backward so that the lower surface 3c of the front end of the pressing piece 3 is a recess formed in the main body 2. The second clamping position is set on the pressing surface 1a of the grip die 1 installed on the gripping die 2a, and is switched to the rearward unclamping position where the lower surface 3c of the front end of the pressing piece 3 is separated from the pressing surface 1a. The hydraulic cylinder 6 and the rear portion of the pressing piece 3 are moved up and down, and when the pressing piece 3 is in the clamp position, the rear portion of the pressing piece 3 is pushed upward to push the pressing piece 3 into the bolt of the stud bolt 4. A first fluid pressure cylinder 5 for pressing and clamping the grip die 1 by the lower surface 3c of the front end of the pressing piece 3 by rotating the head 4a as a fulcrum is provided. Flop mechanism.