JPS625695B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a die changing method in a forging press. The purpose of this is to significantly shorten the time required for changing molds and to reduce the burden on workers during mold changing operations, compared to methods in which molds are changed while the die holder is still set in the press. The purpose is to significantly reduce the

Conventionally, when replacing the mold with the die holder still set in the press, the following method was used.
That is, since the mold is fixed to the die holder by a plurality of bolts via a clamp metal fitting, the bolts are first loosened for each mold. Next, a worker directly hooks the clamp hardware and the mold from inside the die holder to a trolley or the like prepared outside the press with a wire, and moves it using a crane or the like. Conversely, the same applies when setting a new mold in the die holder. In addition to the poor working environment, this method involved dangerous work because the mold and clamp hardware were generally quite heavy.

For this reason, some machines have been designed to take the die holder in and out of the press machine and replace the mold outside the press machine, but it is a considerable amount of work to take the entire die holder in and out, and requires a large amount of power and equipment.

The present invention improves the drawbacks of the known techniques as described above. In other words, when replacing the die with the die holder set in the press, the clamping method was replaced with a hydraulic cylinder so that the operator did not have to go directly into the die holder and tighten and loosen bolts, which was the case in the past. This method uses a spring, and with the die holder set in the press, the sub-holder in which the mold is set is taken out from the die holder using a device such as a hydraulic cylinder.
Examples will be described below.

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. 9 (Fig. 2) is a front clamp piston for pressing against the rear liner when clamping the sub-holders 3 and 20; 10
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 to the clamp position, 21 is a clamper, and 22 is a clamper 2.
This is a clamp lever for fixing the sub-holder 20 via the clamp lever 1. 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 moving the sub-holder 20 in and out of the die holder 18 by connecting the swing motor 35; 37 (FIG. 5) is the sub-holder 20;
This is the T-head bracket attached to the.

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. Since the clamp 24 secures a slight clearance from the shoulder of the sub-holder 20, it is fixed as it is.

Next, after loading the sub-holder, for the upper die holder 1, hydraulic pressure is sent to the hydraulic cylinders 10 and 13, and the sub-holder 3 and the mold 2 are pressed against each side light 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 fitting 37 and the T-head 34, the sub-holders 20 and 3 and the molds 19 and 2 are superimposed on the table 31 using the hydraulic cylinder 36.ゝMove.

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. Thus, the table 31 is the T-die holder 1
A table that is movable by a roller follower 33 in the horizontal direction with respect to 8 (with the direction in which the sub-holder is taken in and taken out is vertical) and has a mold to be replaced prepared in advance set on a separately provided stand with a roller follower. It can be easily replaced with 31.

As described above, according to the present invention, there is no need to tighten or loosen bolts or move the mold under the poor environment inside the die holder, and the mold can be replaced easily, quickly, and safely. be able to.

As mentioned above, the present invention uses a sub-holder type with a length to set the mold, and uses a mold exchange method in which only this sub-holder is taken in and out, and the sub-holder is automatically clamped inside the machine, so that it is possible to replace the mold by several tons as in the conventional method.
It is no longer necessary to take in and out the die holder, which weighs as much as Therefore, the energy required for loading and unloading is extremely small, which is effective in saving energy, and at the same time, it is possible to downsize the loading and unloading equipment, making it possible to achieve safer work.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of an apparatus for carrying out the mold changing method according to the present invention. FIG. 2 is a sectional view of the front clamper of the sub-holder. FIG. 3 is a front view (cross-sectional view) of a device that implements the mold exchange method. Figure 4 is a side view of the mold exchange cart. FIG. 5 is a detailed view of the section viewed from arrow V 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. Unclamp the sub-holder clamped to the die holder of the forging press and in which the die is set from the automatic clamping device, and take out the sub-holder from the die holder using the sub-holder take-out device installed on the die exchange cart. , place it on the table of the mold exchange trolley, slide the table laterally with respect to the lower die holder, place the new sub-holder previously mounted on the table of the mold exchange trolley on the die holder using the loading/unloading device, and place it on the automatic clamping device. A method for changing a die in a forging press, characterized in that a new sub-holder is clamped to a die holder. 2. A table that carries a sub-holder with a die set thereon and moves laterally with respect to the lower die holder;
a swing motor equipped with a T-head that can be engaged with and detached from a lower sub-holder on the side opposite to the forging press with respect to the table;
The table, the swing motor, and the hydraulic cylinder are provided on a movable mold exchange cart, and are connected to the upper and lower die holders of the forging press. A device for carrying out a die changing method in a forging press, characterized in that a clamping device is provided for automatically clamping upper and lower sub-holders to upper and lower die holders using hydraulic pressure and springs.