JPH0487599U - - Google Patents

Description

[Brief explanation of the drawing]

The drawings show one embodiment of the invention, FIG. 1 is a circuit diagram, and FIG. 2 is a flowchart explaining the operation.
FIG. 3 is a line diagram, and FIG. 4 is an explanatory diagram showing another embodiment. 1 is the press body, 1a is the bolster, 2 is the lower die,
2a is a lower die-cutting pad, 3 is a die-cutting pin, 4 is a die-cutting pin, 5 is a pin holder, 8 is a locking device, 8a is a chamber, 14 is a servo valve, 21 is an upper die, 23 is a hydraulic cylinder .

Claims (1)

[Claims for Utility Model Registration] (1) A lower die cushion pad provided in the vicinity of the lower die 2 installed on the bolster 1a of the press body 1 is elastically supported by a dictation 4 via a dictation pin 3. In this case, the pin holder 5 supporting the dictation pin 3 is raised to the upper limit position of the dictation by the hydraulic pressure supplied to the chamber ₈₃ of the locking device 8, and the hydraulic pressure in the chamber ₈₃ is controlled by the upper die 21. This pre-lowering device for a dictation is characterized in that the lower mold cushion pad 2a is preliminarily lowered at a speed corresponding to the lowering speed of the upper mold 21 by draining from a pin touch position where it collides with the lower mold cushion pad 2a by a servo valve 14. (2) The preliminary lowering device according to claim 1, wherein the servo valve 14 is controlled so that the pressure in the chamber ₈₃ gradually increases, so that the pressure becomes approximately equal to the ducting capacity when the preliminary lowering is completed. (3) The pre-lowering device according to claim 1, wherein a hydraulic cylinder (23) for supporting the dictation pin (3) is provided within the pin holder (5), and the pressure within this hydraulic cylinder (23) is controlled by a servo valve (14).