Double-support-plate numerically-controlled hydraulic cushion for double-die production of pressing machine

Abstract

A double-support-plate numerically-controlled hydraulic cushion for double-die production of a pressing machine comprises a support plate I, a support plate II, bases, support bases, a workbench, ejector rods I, ejector rods II, blank holders I, blank holders II, a lower die I, a lower die II, an upper die I, an upper die II and a hydraulic system. The workbench is fixedly mounted on the bases, the upper dies I and II are fixedly mounted on a pressing head of the pressing machine, the upper end of each ejector rod I is fixedly connected with the corresponding blank holder I, the lower end of each ejector rod I is fixedly connected with the support plate II, the upper end of each ejector rod II is fixedly connected with the corresponding blank holder II, and the lower end of each ejector rod II is fixedly connected with the support plate I. Eight hydraulic cylinders of the hydraulic system are mounted on the support bases, and the support bases are fixed on the bases. Each of the support plate I and the support plate II is supported by four of the hydraulic cylinders, and a hydraulic control system is connected with the hydraulic cylinders through pipelines. The double-support-plate numerically-controlled hydraulic cushion has the advantages that pressure of the two support plates can be adjusted respectively, and double-die production with different pulling depth can be performed; pressure fluctuation is small during working, and quality of stamping parts is good; the cushion is small in size, and nominal blank holder force can be large enough.

Description

technical field [0001] The invention belongs to the technical field of stamping machinery engineering, and in particular relates to a numerically controlled hydraulic stretching mat used for a press, in particular to a double-crown numerically controlled hydraulic stretching mat used for double-mode production of a press. Background technique [0002] At present, the commonly used stretching pads for domestic stamping and drawing presses are pure gas single crown (supporting plate) stretching pads. The disadvantages of pure gas single crown (supporting plate) stretching pads are: 1), Double-mode production with different drawing depths cannot be carried out; 2), the pressure fluctuation is very large, which makes the stretched workpiece prone to cracking or wrinkling; 3), the pressure of the air cushion is not adjustable, and cannot provide different deformation stages of the workpiece 4) The volume is large, and the nominal blank-holding force is limited. Contents of the ...

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