JPS6160743B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transfer feed device in a forging press.

Conventionally, in this type of transfer feed device, a pair of feeder bars are moved synchronously, so that claws attached to the feeder bars grip the feeder bars.
In order to perform each operation of lifting, shifting, lowering, releasing, and returning, a combination of a lever mechanism and a cam are operated synchronously, and the operating characteristics are fixed for each cam. Therefore, in order to change the operating characteristics, a pair of cams must be newly created and replaced, resulting in lack of versatility.

The present invention was devised to solve the above-mentioned conventional problems, and each operation of the transfer feed is performed by a cylinder, and the operation cylinder is controlled using a servo motor, and the operating characteristics can be arbitrarily selected. It is an object of the present invention to provide a transfer feed device for a forging press that can perform optimal handling according to the workpiece.

Hereinafter, the present invention will be explained with reference to the illustrated embodiments. 1 is a synchronizing device, and a cylindrical guide case 2
Attachment flanges 3 and 4 are provided at both ends of the servo motor 5, and a servo motor 5 is integrally and concentrically attached to the attachment flange 4. A bearing 6 is provided at the center of the mounting flange 2, and a guide 7 extending in the case length direction is provided on the inner surface of the guide case 1.

Inside this synchronizer 1, a moving frame 8 is arranged to engage with a guide 7 and to be slidable up and down on the inner surface of the guide case 1, and a ball screw nut 9 is provided at the center of the moving frame. A screw shaft 10 is engaged with the ball screw nut 9, is rotatably supported by the bearing 6, and is connected to the output shaft of the servo motor 5 via a coupling 10' to be rotatably driven.

Further, two single-rod type control cylinders 11 are fixed to the mounting flange 3 in parallel with the screw shaft 10, and their pistons 12 can freely come into contact with the moving frame 8.

The rod retraction side oil chambers 15a of two operation cylinders 14 for actuating the feeder bar are connected to the oil chamber 13 of this control cylinder 11 via oil passages 16, respectively, and the rod extrusion side oil chambers 1 of the operation cylinders 14 are connected to each other through oil passages 16.
A clamp circuit 17 is connected to 5b. This clamp circuit 17 includes an accumulator 20, a pressure switch 21, a check valve 22, a relief valve 23, and a solenoid valve 24 in an oil passage 19 that connects a hydraulic pump 18 and an operating cylinder 14. When the set pressure is reached, the pressure switch 21 is activated and the solenoid valve 24 is activated.
is energized, the setting value of the relief valve 23 is set close to zero, and the hydraulic pump 18 is placed under no load. When the internal pressure of the accumulator 20 decreases, the pressure switch 21 is activated to cut off the excitation of the solenoid valve 24, and the hydraulic pump 18 is turned off.
The pressure oil from 8 is sent to the accumulator 20.

Further, the maximum capacity of the oil chamber 13 of the control cylinder 11 is slightly larger than that of the rod retraction side oil chamber 15a of the operation cylinder 14, and the rod extrusion side oil chamber 15b of the operation cylinder 14 has a slightly larger maximum capacity than the rod retraction side oil chamber 15a of the operation cylinder 14.
5, 26 and an oil passage 28 with a relief valve 27, the oil passage 28 is connected to the oil passage 16 between the check valves 25, 26.

In the above configuration, the servo motor 5 has the required rotational characteristics (start-up -
When the screw shaft 10 rotates, the moving frame 8 moves along the guide 7 through a screw mechanism consisting of the screw shaft 10 and the ball screw nut 9. Moving. The servo motor 5 is servo-controlled while detecting the position of the moving frame 8 by the rotation of the screw shaft 10. For example, if the characteristics of cycloidal motion are input, the motion of the moving frame 8 will have the characteristics as shown in FIG.

On the other hand, the clamp circuit 17 constantly applies appropriate pressure to the rod push-out side oil chamber 15b of the operating cylinder 14, and the operation cylinder 14 operates, and the rod retracting-side oil chamber 15a flows into the oil chamber 13 of the control cylinder 11. Hydraulic oil is sent through the oil passage 16 to cause the piston 12 of the control cylinder 14 to protrude, and the piston 12 comes into contact with the moving frame 8 and does not come off.

As a result, the moving frame 8 is driven by the servo motor 5.
When the piston 12 of the control cylinder 11 is pushed up through the piston 12, the oil from the control cylinder 11 is sent into the rod retraction side oil chamber 15a of the operation cylinder 14, and the rod retraction operation of the operation cylinder 14 is performed. At this time, the oil pushed out from the rod extrusion side oil chamber 15b is accumulated in the accumulator 20 through the oil passage 19. As mentioned above, the oil chamber 13 is larger than the oil chamber 15a, so the piston of the operating cylinder 14 is operated to the end of the cylinder.
After the operation is completed, the oil of the volume difference is transferred from the oil path 16 to the oil tank 29 via the check valve 26 and the relief valve 27.
Return to Also, due to the reverse rotation of the servo motor 5, the moving frame 8
When the pressure is lowered, the pressure in the oil chamber 13 disappears, and therefore, the oil is supplied from the accumulator 20 to the oil chamber 15b, and the operation cylinder 14 performs a rod pushing operation. As a result, the oil in the rod retraction side oil chamber 15a is sent to the control cylinder 11.
The piston 12 of No. 1 operates to protrude. When the piston of the operating cylinder 14 reaches the stroke end, pressure oil is sent into the oil chamber 13 via the oil passages 28 and 16, and the piston 12 of the control cylinder 11 protrudes so as to be in constant contact with the moving frame 8. Operate.

In addition, if the servo motor 5 is driven to push up the piston 12 via the moving frame 8 and the piston of the operation cylinder 14 is being retracted, if the feeder bar gets caught and the piston cannot be retracted, The oil in the oil chamber 13 is returned from the oil passage 16 to the tank 29 via a check valve 26 and a relief valve 27 to prevent accidents in such cases.

Therefore, the two operating cylinders 14 can be reliably operated synchronously by the servo motor 5 via the screw mechanism and the control cylinder 11.

In this embodiment, two operation cylinders 14 are to be operated synchronously, but the number is not limited.

As described above, the present invention controls the operating cylinders of the transfer feed device to be operated synchronously by control cylinders that supply operating pressure, and converts the rotation of the servo motor into piston movement of the control cylinders via a screw mechanism, By configuring the operating cylinders to be actuated synchronously by the servo motor, the operating characteristics of the operating cylinders can be selected arbitrarily, which enables optimal handling according to the workpiece, and also enables control of the operating cylinders. Versatility can be obtained as a means.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing an example of operating characteristics. 1... Synchronous device, 5... Servo motor, 6...
Bearing, 7... Guide, 8... Moving frame, 9... Ball screw nut, 10... Screw shaft, 11... Control cylinder, 12... Piston, 13... Oil chamber, 14...
...Operating cylinder, 15a, 15b...Oil chamber, 16
...Oil passage, 17...Clamp circuit, 28...Oil passage.

Claims (1)

[Claims] 1. The operation cylinders of the transfer feed device to be synchronously operated are each controlled by a control cylinder that supplies operating pressure, and the rotation of the servo motor is converted to piston movement of the control cylinder via a screw mechanism, and the servo motor is used to A transfer feed device for a forging press, characterized in that the operating cylinders are configured to operate in synchronization.