JPS625694B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an upper mold clamping device for a forging press, and particularly to a clamping device for an upper mold set in a sub-holder in a method of exchanging molds while a die holder remains set in the press. It is related to the device.

Because the molds of the forging presses are used under harsh conditions,
Needs to be replaced frequently. However, in the case of hot forging presses, the environment for mold change work is poor, with narrow spaces, high temperatures, and contamination from mold lubricants. The mold clamping device according to the present invention was invented to relieve the operator from the above-mentioned work.

In conventional molds, the mold was fixed to a die holder with a plurality of bolts via a clamp metal fitting. This method forces workers to tighten and loosen bolts under poor working conditions. This work was particularly labor intensive when the molds were frequently replaced.

The present inventor has recently invented a method for exchanging the mold while the die holder remains set in the press, and has filed a patent application. When carrying out this method, the present invention provides a mold clamping device that uses a hydraulic cylinder and a spring, in particular for the upper die so that the operator does not have to directly enter the die holder to tighten and loosen the bolts. This invention relates to a mold clamping device.

Examples will be described below, and a clamping device for a lower mold related to the present invention and a method for replacing a mold clamped by these clamping devices will also be briefly described.

1 is an upper die holder, and 18 is a lower die holder. 2 is an upper mold, and 19 is a lower mold. 3 and 20
are upper and lower sub-holders that directly fix the mold, 4 is a front clamper, and 5 is a rear clamper. 6 is a clamp piston that fixes the sub-holder 3 via the clampers 4 and 5; 7 is a spring that pushes the clamp piston 6 upward during clamping; and 8 is a spring that pushes the clamp piston 6 down over the spring 7 to unclamp it. This is a hydraulic cylinder. Furthermore, clamper 4,
Reference numeral 5 has a long hole through which a clamp piston 6 passes, and is formed in a direction away from the sub-holder, so that the clampers 4 and 5 can be moved in a direction away from the sub-holder by means to be described later. 9 (Fig. 2) is a front clamp piston for pressing against the rear liner when clamping the sub-holders 3 and 20; 1;
0 is a hydraulic cylinder that operates when clamping the front clamp piston 9. Reference numeral 11 denotes a spring that pushes back the front clamp piston 9 when unclamping it. Reference numeral 12 denotes a side clamp piston for pressing against the left side liner when clamping the molds 2 and 19. 13 is a hydraulic cylinder that operates when clamping the side clamp piston, and 14 is a spring that pushes back the side clamp piston when unclamping it. Reference numeral 15 designates a lever for moving the unclamped clamper 4 when replacing the mold, and reference numeral 16 represents a hydraulic cylinder for moving the unclamped rear clamper 5 back and forth when replacing the mold. 17 is a limit switch for confirming that the rear clamper 5 is set at the clamper position, 21 is a clamper, and 22 is a clamp lever for fixing the sub-holder 20 via the clamper 21. 23 is a hydraulic cylinder for operating the clamp lever 22, and 24 is a rear clamper.

31 (Fig. 4) is a table on which the sub-holder 20 with the mold set is placed, 32 is a self-propelled mold exchange cart that moves with the table 31 placed thereon, and 33 supports the table 31, and the table 31 is used to hold the mold. This is a roller follower used to move on the exchange cart 32. 34 is a fastening T-head for taking the sub-holder 20 in and out of the die holder 18. 35
3 is a swing motor for rotating the T head 34;
6 is a hydraulic cylinder for connecting and moving the swing motor 35 to move the sub-holder 20 in and out of the die holder 18, and 37 (FIG. 5) is a T-head receiving fitting attached to the sub-holder 20.

The die of the forging press constructed as described above is clamped and replaced in the following manner.

(i) Mold clamping method Before the upper and lower sets of molds 2, 19, which have been previously set in the sub-holders 3, 20 outside the die holder, are inserted into the die holders 1, 18, the following operation is performed.

For the upper die holder 1, pressure oil is sent to the hydraulic cylinder 8, and the clamp piston 6 is moved in the unclamping direction (downward in the figure) by overcoming the spring force. Next, the clampers 4 and 5 are moved in a direction away from the sub-holder 3 using the lever 15 and the hydraulic cylinder 16, respectively, to a position where they do not interfere with the sub-holder 3. By removing pressure oil from the hydraulic cylinders 10 and 13, the front clamp piston 9 and the side clamp piston 12 can be retracted by the springs 11 and 14 to a position where they do not interfere with the sub-holder 3.

Hydraulic cylinder 2 for lower die holder 18
3 to lower the clamp lever 22 below the sub-holder sliding surface (phantom line in Figure 1). Since the clamp 24 secures a slight clearance from the shoulder of the sub-holder 20, it is fixed as is.

Next, after loading the sub-holder, for the upper die holder 1, pressure oil is sent to the hydraulic cylinders 10 and 13, and the sub-holder 3 and the mold 2 are pressed against each side liner by the clamp pistons 9 and 12.
After positioning, move clampers 4 and 5 to lever 1.
5 and hydraulic cylinder 16 to the sub-holder clamp position, the pressure oil in the hydraulic cylinder 8 is removed, the clamp piston 6 is moved upward by the spring 7, and the sub-holder 3 is clamped via the clampers 4 and 5. Since the clamping position of the clamper 5 can be detected by the limit switch 17 (FIG. 1), there is no need for the operator to go around to the rear of the press to check.

Hydraulic cylinder 1 for lower die holder 18
Pressurized oil is sent to 3, the sub-holder 20 and the mold 19 are pressed against the side liner by the clamp piston 12, and after positioning, the tip of the clamp lever 22 is lifted at one end by the hydraulic cylinder 23, and the clamper 21 is placed on the shoulder of the sub-holder 20. Then, the clamp lever 22 is lowered again using the hydraulic cylinder 23 to clamp the sub-holder 20 via the clamper 21.

A similar method can be used to take out the sub-holder 20.

(ii) Mold replacement method A case will be described below in which a die holder is set in a press and a sub-holder in which a mold is set is taken out from the die holder (see Fig. 4).

First, after all the clampers are released, the swing motor 35 and the T head 34 are attached to the T head receiving bracket 37 on the sub holder 20 using the hydraulic cylinder 36.
(Fig. 5) and move the swing motor 3
5 rotates the T-head 34, and after completing the joint between the T-head receiving bracket 37 and the T-head 34, the sub-holders 20 and 3 and the molds 19 and 2 are placed on the table 31 by the hydraulic cylinder 36, and the molds 19 and 2 are placed on top of each other. Moving.

Next, the mold changing cart 32 is moved to a predetermined position, the T head 34 is rotated again by the swing motor 35, the joint between the T head receiving bracket 37 and the T head 34 is released, and the T head 34 is moved with the hydraulic cylinder 36. Move from the inside of the T-head receiving fitting 37 to the outside. In this way, the table 31 can be moved in the horizontal direction with respect to the lower mold die holder 18 (with the direction in which the sub-holder is taken in and taken out being the vertical direction) by the roller follower 33, and the table 31 can be moved by the roller follower 33, and the table 31 can be moved in the horizontal direction with respect to the lower die holder 18 by the roller follower 33. It can be easily replaced with the table 31 on which the mold is set.

As described above, in the device of the present invention, the clamper that clamps the sub-holder can be moved vertically and laterally separately, thereby eliminating waste in the moving direction.
Furthermore, all of the spring force for clamping can be applied to the clamper, so a strong clamping force can be obtained. In addition, since the clamper is tightened by a spring, a reliable tightening force can be obtained without a decrease in tightening force or the effects of vibration, oil leakage, etc.

By employing the device of the present invention, an operator does not have to tighten or loosen bolts under the poor environment inside the die holder, and it is possible to facilitate the replacement of related molds.

Furthermore, by using the lower die clamping device and the die changing method that were filed at the same time as this application, the energy required for changing the die in the forging press can be extremely reduced.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a forging press using the upper mold clamping device according to the present invention. FIG. 2 is a sectional view of the front clamper of the sub-holder. Figure 3 is a front cross-sectional view of the forging press. Figure 4 is a side view of the mold exchange cart. Fifth
The figure is a detailed view of the section viewed from the V arrow in FIG. 4. In the figure: 1...Die holder, 2...Mold,
3...Sub holder, 4...Front clamper, 5...
Rear clamper, 6... Clamp piston, 7...
Spring, 8... Clamp cylinder, 9... Front clamp piston, 10... Hydraulic cylinder, 11...
Spring, 12...Side clamp piston, 13...
... Hydraulic cylinder, 14 ... Spring, 15 ... Lever, 16 ... Hydraulic cylinder, 17 ... Limit switch, 18 ... Die holder, 19 ... Mold, 2
0...Subholder, 21...Clamper, 22...
Clamp lever, 23... Clamp cylinder, 2
4... Rear clamper, 31... Table, 32...
...Mold exchange trolley, 33...Roller follower, 34
... T head, 35 ... Swing motor, 36 ... Hydraulic cylinder, 37 ... T head receiving metal fitting.

Claims (1)

[Claims] 1. A clamper for tightening and loosening an upper sub-holder in which an upper mold is set on the upper die holder, a hydraulic cylinder for urging the clamper upward by a spring, and a device for moving the clamper in a direction away from the sub-holder, An upper mold clamping device for a forging press, characterized in that the clamper has a long hole through which the cylinder piston passes in a direction away from the sub-holder.