JPH01241345A - Device for adjusting height of upper die in hot forging press - Google Patents

Abstract

PURPOSE:To correct the height of an upper die on each stage and to prevent the generation of a defective part by fitting an upper die into a slide vertically movably and changing the amt. of the hydraulic oil fed to the lower side oil pressure chamber of the upper die by the combination of plural hydraulic pumps. CONSTITUTION:The upper die 1 of a hot forging press is fitted into a slide 2 vertically movably and oil pressure chambers 5, 4 are formed at the upper and lower parts of the upper die 1. The selective turn-on operation of solenoid valves 18a-18c is executed along the pump work pattern set on each stage of the correction pattern input into a control device. A set oil amt. is discharged from the worked hydraulic pump of one or plural units 6a-6c, the hydraulic oil amt. of the hydraulic pumps 6a-6c is fed to a lower side hydraulic chamber 4 and the upper die 1 is ascended. When the solenoid valves 18a-18c are turned off, the hydraulic oil from a hydraulic pump 12 is flowed into the discharging side hydraulic chamber of the pumps 6a-6c via a solenoid valve 17 and the oil from a sucking side hydraulic chamber is circulated via the solenoid valves 18a-18c. The height of the upper die 1 can thus be corrected to the normal one.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an upper die height adjustment device in a hot forging press, and particularly to an apparatus that is effective for automating upper die height adjustment.

[Conventional technology]

Conventionally, in hot forging presses, the forming load in each forging process varies depending on the product, and the number of forged products in the press changes, so even though the elongation of the press frame changes, The height of the upper mold was not adjusted, but merely the height of the slide.

[Problem to be solved by the invention]

For this reason, when manufacturing a ring gear, for example, as shown in Figure 2, even though the actual upper mold height is H' compared to the normal upper mold height H in the upsetting process, the upsetting process It happens that you do this. In this upsetting process, the standard external dimension D becomes D', and this upsetting forged product is processed into the lower die 1 in the next roughing process.
9, the diameters of the lower die 19 and the forged product do not match, so the forged product is biased to one side in the lower die 19, causing spatter and pieces of part of the forged product. This had the inconvenience of producing defective products that were chewy or lacked meat.

[Purpose of the invention]

The present invention has been made to solve the above problems, and an object of the present invention is to enable easy correction and adjustment of the height of the upper die in each forging process.

[Means to solve the problem]

The upper die height adjustment device for a hot forging press of the present invention is a hot forging press in which the upper die is fitted into a slide so as to be movable up and down, thereby defining hydraulic chambers above and below the upper die. , multiple hydraulic pumps with different discharge volumes are connected to the lower hydraulic chamber, and the height of the upper mold is adjusted by changing the amount of hydraulic oil supplied or extracted by selectively combining the hydraulic pumps. It is characterized by

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In the figure, 1 is a plurality of upper molds arranged on the slide 2 along the workpiece transfer direction, and the upper end of each upper mold 1 is attached to the slide 2.
It is fitted in a mold case 3 that is integrally built into the mold case 3 so as to be movable up and down, and its lower end protrudes below the slide 2.

4.5 is each upper mold 1 by the upper mold 1 and mold case 3.
Hydraulic chambers are defined above and below (hereinafter, one upper mold 1 will be explained for convenience), and one hydraulic chamber 4 contains the discharge side hydraulic pressure of a plurality of cylinder type hydraulic pumps 6a, 6b, 6c. The chambers are connected in parallel and the hydraulic chamber 4 communicates with a tank 9 via a check valve 7 and via a solenoid valve 8.

A hydraulic pump 12 is connected to the other hydraulic chamber 5 via a check valve 10 and a solenoid valve 11, and a hydraulic pump 12 is connected to the other hydraulic chamber 5 via a relief valve 13 and a pilot operated check valve 1.
It communicates with tank 9 via 4. A hydraulic pump 12 is connected to the pilot circuit of the pilot-operated check valve 14 via a solenoid valve 15, and when the solenoid valve 15 is turned on, the pilot circuit communicates with the tank 9 and closes the check valve 14.

16a, 16b, and 16c are stoppers for adjusting the discharge amount;
They are attached to the hydraulic pumps 6a, 6b, and 6c, respectively, and limit the backward stroke of each piston.

The hydraulic pump 12 is connected to the discharge side hydraulic chambers of the hydraulic pumps 6a, 6b, and 6C via a solenoid valve 17, and
The suction side hydraulic chambers of the hydraulic pumps 6a, 6b, 6c are connected to the tank 9 via electromagnetic valves 18a, 18b, 18c, respectively.
When the solenoid valves 18a, 18b, and 18c are turned on, the hydraulic pump 12 is connected to the suction side hydraulic chambers of the hydraulic pumps 6a, 6b, and 6C, and communication with the tank 9 is cut off.

Reference numeral 19 denotes a plurality of lower molds mounted on the bed 20 and arranged opposite to the upper mold 1. When the slide 2 is at the upper end position, processed products are sequentially transferred to the lower mold 19 by transfer feed. Then, when the slide 2 is lowered, each forging process of a product, for example, a ring gear, is simultaneously performed by each set of the upper die 1 and the lower die 19.

[Effect]

Since the forming load in each forging process differs depending on the product, and the number of forged products in the press changes, the elongation of the press frame (change in the distance between the slide 2 and the bed 20) also changes. However, the amount of change is constant depending on the product, and moreover, the HMD method (thermal mass detection method) and feed claw clamp detection method detect which process of the press the forged product is in, so slide 2 is the most Retract the upper mold 1 to the upper end position with respect to the required height from the lower mold 19 to the upper mold 1 in each process when descending (the upper mold height corresponding to the regular dimensions of the forged product). If it is necessary to correct the upper mold height to the normal upper mold height H because the upper mold height in the original state (initial state before correction) is H', perform this for each upper mold 1. By vertical adjustment,
The amount of correction that takes into account the amount of change due to elongation of the press frame can be set for each process (correction pattern)
.

Further, the capacity (discharge amount) of the discharge side hydraulic chambers of the hydraulic pumps 6a, 6b, 6c is determined by the respective stoppers 16a, 16.
It can be set by limiting the piston backward stroke by bSl 6c, and each hydraulic pump 6a, 6b,
The solenoid valves 18a, 18b, and 18c are operated independently of each other by selectively turning on the solenoid valves 18a, 18b, and 18c, and the discharge amount of only one pump or the combined discharge amount of multiple pumps is adjusted to the hydraulic chamber 4 on the lower side of the upper mold 1. can be supplied to Therefore, pump operation patterns (seven patterns in the embodiment) can be set so that the amount of hydraulic oil supplied to the hydraulic chamber 4 can be changed appropriately to obtain the amount corresponding to the correction amount, so that each step of the correction pattern can be set. This means that a pump operation pattern corresponding to each correction amount can be set for each correction amount.

During forging work, when a correction pattern corresponding to the forged product is input into the control device, the solenoid valve 18a,
18b and 18c are selectively turned on, and the set amount is discharged from one or more activated hydraulic pumps, and when the solenoid valve 17 is turned off, hydraulic oil is not supplied from the hydraulic pump 12. Therefore, the amount of hydraulic oil from the activated hydraulic pump is supplied to the hydraulic chamber 4, and the upper mold 1 rises. On the other hand, when the solenoid valve 15 is turned on, the pilot pressure does not work on the pilot-operated check valve 14, and the check valve 14 is closed together with the check valve 10 even though the hydraulic pump 12 is in operation. The hydraulic pressure in the upper hydraulic chamber 5 increases as the upper mold 1 rises, and when it exceeds the hydraulic pressure set by the relief valve 13, oil flows back from the hydraulic chamber 5 to the tank 9, so that the upper mold The set hydraulic pressure of the relief valve 13 is held in the upper hydraulic chamber 5 of the valve 1. Therefore, the upper die 1 is raised by a correction amount corresponding to the amount of hydraulic oil supplied from the operating pump, and this correction operation is performed in each process to obtain a desired correction pattern, and at the time of forging in each process. The necessary forming load will be maintained.

When the solenoid valve 15 is turned off, the discharge pressure of the hydraulic pump 12 acts as a pilot pressure, the check valve 14 opens, and hydraulic oil is continuously supplied from the hydraulic pump 12 into the hydraulic chamber 5, so that the above state can be maintained. Forging operation can be performed while holding.

After the forging operation, when the solenoid valves 8 and 11 are turned on, hydraulic oil is supplied to the hydraulic chamber 5 by the hydraulic pump 12, and the hydraulic chamber 4 communicates with the tank 9, so that the oil is returned to the tank 9. Therefore, the upper mold 1 is quietly lowered by the action of the aperture mechanism.

Next, when the solenoid valve 15 is turned on, the check valve 14 is closed as described above, so the hydraulic oil from the hydraulic pump 12 flows into the hydraulic chamber 5 via the solenoid valve 11 and the check valve 10, and the relief valve 13 The hydraulic oil is circulated through the tank 9. Also, when the solenoid valve 17 is turned on,
The hydraulic oil from the hydraulic pump 12 flows into the hydraulic chamber 4 through the solenoid valve 17, and the hydraulic oil is circulated through the solenoid valve 8 and returned to the tank 9.

Thereafter, when the solenoid valves 18a, 18b, and 18c are turned off, the hydraulic oil from the hydraulic pump 12 flows through the solenoid valve 17 into the discharge side hydraulic chambers of the hydraulic pumps 6a, 6b, and 6C, and also flows into the suction side hydraulic chambers. Oil flows from the solenoid valves 18a, 18b,
Since the water flows back to the tank 9 via 18c, each piston retreats until it abuts against the stoppers 16a, 16b, and 16c.

Finally, when solenoid valve 8.11.15.17 is turned off,
Return to the original state before inputting the correction pattern.

Through the above correction procedure, the height of the upper die in each forging process can be corrected to the normal height using a correction pattern corresponding to the product.

Therefore, when manufacturing, for example, a ring gear using a hot forging press, each forged product has an appropriate outer shape, so the lower mold 1
It is stable within 9, and even when molded, it does not produce cracks or pieces of material that can cause defective products.

In this embodiment, one or more hydraulic pumps 6a,
An example has been described in which the height of the upper mold 1 is corrected by supplying hydraulic oil in an amount determined by the combination of 6b and 6c to the hydraulic chamber 4. , it goes without saying that the height of the upper mold 1 may be corrected by changing the amount of oil extracted from the hydraulic chamber 4 or the amount of oil supplied to the hydraulic chamber 5 based on this reference.

[Effects of the Invention] As described above, the present invention allows the upper die of each forging process to be fitted into the slide so as to be movable up and down, and to control the amount of hydraulic oil supplied to the hydraulic chamber on the lower side of the upper die by a plurality of units. By appropriately changing the combination of hydraulic pumps, the height of the upper mold can be corrected and adjusted for each forging process, ensuring that it corresponds to the product and preventing the occurrence of defective products such as jammed edges and insufficient thickness. It is possible to improve product quality. In addition, a correction pattern that determines the correction amount for each forging process, and a pump operation pattern that combines multiple hydraulic pumps to obtain the respective correction amount for each forging process corresponding to the pattern are set. It can be applied reliably to various products and is also effective in automating forging work.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing a forging process of a ring gear. 1... Upper mold, 2... Slide, 4.5... Hydraulic chamber, 6a, 6b, 6c... Hydraulic pump, 7.10...
・Check valve, 8.11.15.17.18a, 18b
, 18c... Solenoid valve, 12... Hydraulic pump, 13.
・Relief valve, 14... Pilot operated check valve,
16a, 16b, 16c...7. Toppa. Billet upsetting 2 diagram

Claims (1)

[Claims] (1) In a hot forging press, an upper mold is fitted into a slide so as to be movable up and down, hydraulic chambers are defined above and below the upper mold, and multiple units with different discharge volumes are installed in the lower hydraulic chamber. Upper mold height in a hot forging press characterized by connecting a hydraulic pump and adjusting the upper mold height by changing the amount of hydraulic oil supplied or extracted by using selective combinations of the hydraulic pumps. Adjustment device.