JPS6227302Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a hydraulic system for a closed forging machine that uses a punch to form the material in the upper and lower molds after the upper and lower molds are sealed. However, the workload of the press due to the lowering of the upper mold can be saved, and the peak pressure and pressure change in the cylinder that supports the upper mold can be suppressed, and the delay in switching from low pressure to high pressure of hydraulic pressure can be reduced. An object of the present invention is to provide a hydraulic device for a closed forging device that saves time.

Embodiments of the present invention will be described below based on the drawings.

In the figure, 1 is a lower mold fixed to the bolster side via a lower die set, and 2 is an upper die set fixed to a slide 3. The upper die set 2 is provided with a cylinder 4 for supporting the upper mold, and a piston 6 with a piston rod 5 projecting from the lower surface of the upper die set 2 is fitted into the cylinder 4. An upper mold 7 facing the lower mold 1 is formed at the tip of the piston rod 5.

Reference numeral 8 denotes a horizontal punch that is movable laterally with respect to the lower mold 1 and upper mold 7, and the tip of this horizontal punch 8 protrudes and retracts into both molds 1 and 7 which are sealed. I'm starting to do that. Reference numeral 9 denotes a swinging lever supported by a support shaft 10 on the lower die set so as to be swingable in the moving direction of the horizontal punch 8. The horizontal punch 8 is connected to one end of this swinging lever 9, and the swinging lever 9 is connected to one end of the swinging lever 9. A block 11 is connected to the other end of the swing lever 9 and to a portion located inside the lower die set from the fulcrum of the swing lever 9. Furthermore, a piston 12 is opposed to the other end of the swinging lever 9 and urges the swinging lever 9 in the direction of returning the horizontal punch 8.
This piston 12 is the cylinder 1 for returning the horizontal punch.
3 is fitted.

A piston 14 is fitted into a horizontal punch cylinder 15 provided in the upper die set 2. The tip of the piston 14 faces the upper surface of the block 11, and pressurized oil is supplied to the bottom chamber 16 of the cylinder 15. By supplying the punch, the swing lever 9 is rotated via the piston 14 and block 11 in the horizontal punching direction.

The cylinder 4 for supporting the upper mold is connected to a low pressure accumulator 17 and a high pressure accumulator 18. Both pressure accumulators 17 and 18 have pistons 19 and 2, respectively.
It consists of cylinders 21, 22 into which the cylinders 0 are fitted, and pressure accumulators 23, 24 connected to one chamber of each cylinder 21, 22 partitioned by pistons 19, 20. A bottom chamber 4a of the cylinder 4 for lowering the upper mold is connected to the chamber.

On the other hand, the bottom chamber 15 of the horizontal punch return cylinder 13 is connected to a pressure accumulator 26 .

Further, the bottom chamber 16 of the horizontal punch cylinder 25 is connected to a pressure accumulator 28.

Note that 27 and 29 in the figure are oil replenishment paths for replenishing the pressure accumulators 26 and 28 with oil.

In the above configuration, when the slide 3 descends, the upper mold 7 comes into contact with the lower mold 1, and the upper and lower molds 1 and 7 are sealed. When the slide 3 further descends, the piston 6 that molded the upper mold 7 rises relatively against the pressure in the bottom chamber 4a of the cylinder 4 for supporting the upper mold, and the pressure in the bottom chamber 4a increases. Thus, the upper and lower molds 1 and 7 are kept in a sealed state.

As the slide 3 descends, the pressure in the bottom chamber 4a of the cylinder 4 for supporting the upper mold increases, and the pressure is first absorbed by the low pressure accumulator 17 and then by the high pressure accumulator 18. Ru.

At this time, both low pressure and high pressure accumulators 17, 18
is the cylinder 21 into which the pistons 19 and 20 are fitted,
22, and pressure accumulators 23, 24 connected to one chamber partitioned by the piston of each cylinder 21, 22.
Since the pressure oil in the cylinder 4 for supporting the upper mold first acts on the cylinders 21 and 22 and then on the pressure accumulators 23 and 24, the pressure oil in the cylinder 4 for supporting the upper mold is Peak pressure and pressure changes are suppressed.

On the other hand, as the slide 3 above descends, the slide 3
The horizontal punch piston 14 provided at
is inserted into the closed mold, and the horizontal punch 8 forms the side surface of the molding material. The operating force of the horizontal punch 8 at this time is the piston 14 for the horizontal punch.
The lowering of the slide 3 after the block 11 has moved to the lower limit is supported by the pressure in the bottom chamber 16 of the cylinder 15 into which the block 11 is fitted, so that the pressure oil in the bottom chamber 16 is accumulated in the pressure accumulator 28. During this time, the horizontal punch 8 comes to a halt.

When molding is completed and the slide 3 rises, the upper mold 7 rises together with the piston 6, and during this time both low and high pressure pressure accumulators 1 are placed in the bottom chamber 4a of the cylinder 4.
Pressure oil is returned from 7 and 18. Pressure oil is also supplied from the pressure accumulator 28 to the cylinder 15 for horizontal punching. The horizontal punch 8 is a piston 12 for returning the horizontal punch.
It will be returned at

Since the present invention is as described above, the pressure in the bottom chamber 4a of the cylinder 4 for supporting the upper mold when the slide 4 is lowered is sequentially absorbed by the low pressure accumulator 17 and the high pressure accumulator 18. The workload of the press for actuating the slide 4 can be saved. Further, the pressure accumulators 17 and 18 are connected to cylinders 21 and 2 into which pistons 19 and 20 are fitted.
2, and the pistons 19 of these cylinders 21 and 22,
Pressure accumulators 23 and 24 are placed in one chamber partitioned by 20.
By connecting the bottom chamber 4a of the cylinder 4 for supporting the upper mold to the other chamber, the bottom chamber 4a of the cylinder 4 for supporting the upper mold is connected.
It is possible to suppress the peak pressure and pressure change within a, and also to eliminate the delay time in switching the hydraulic pressure from low pressure to high pressure.

[Brief explanation of the drawing]

The drawings are configuration explanatory diagrams showing an embodiment of the present invention. 1 is a lower mold, 2 is an upper die set, 4 is a cylinder for supporting the upper mold, 4a is a bottom chamber, 6 is a piston, 7 is an upper mold, 8 is a horizontal punch, 9 is a swing lever, 17, 18 is low pressure, high pressure accumulator, 19,2
0 is a piston, 21 and 22 are cylinders, 23 and 2
4 is pressure accumulation.

Claims (1)

[Scope of utility model registration request] The upper die set 2 is provided with a cylinder 4 for supporting the upper mold, and this cylinder 4 has a piston 6 provided in the upper mold 7 facing the lower mold 1 provided in the lower die set.
In addition, the slide 3 is provided with a cylinder 15 for horizontal punching, a piston 14 for horizontal punching with a piston rod protruding downward is fitted into this cylinder 15, and furthermore, the upper and lower parts are sealed by lowering the slide 3. A horizontal punch 8 that appears and retracts from the lateral direction inside the molds 1 and 7 is connected to one end of a swinging lever 9 provided on the lower die set, and the other end of this swinging lever 9
In a closed forging device in which the tip of the piston 14 for the horizontal punch is opposed to the operating direction of the horizontal punch 8, the cylinder has the pistons 19 and 20 fitted in the bottom chamber 4a of the cylinder 4 for supporting the upper mold. 21, 22, and a pressure accumulator 2 in one chamber partitioned by the pistons 19, 20 of the cylinders 21, 22.
3 and 24 are connected to the other chambers of the respective cylinders 21 and 22 of a low-pressure pressure accumulator 17 and a high-pressure pressure accumulator 18.