Hydraulic machine for fine blanking of sheet metal

Abstract

The invention discloses a hydraulic machine for fine blanking of sheet metal. The hydraulic machine comprises a machine body, a main oil cylinder, a back-pressure cylinder, a gear ring cylinder and a sliding block, wherein the gear ring cylinder is arranged in a lower workbench of the machine body; the upper end of a piston rod of the gear ring cylinder is supported in a lower guide sleeve; the lower guide sleeve is fixed in a central hole of a workbench plate; the main oil cylinder perpendicularly downward penetrates through an upper cross beam and is fixed at the center of the upper cross beam; the head part of a piston rod of the main oil cylinder is fixed on the upper side of the sliding block; the back-pressure cylinder is positioned in the sliding block; the lower side of the back-pressure cylinder is fixed inside the lower part of the sliding block; the lower end of a piston rod of the back-pressure cylinder is supported in an upper guide sleeve; and the upper guide sleeve is fixed in a central hole of the lower side of the sliding block. The hydraulic machine disclosed by the invention is simple in structure and has the advantages that the defect of desynchrony of a multi-cylinder system is overcome, the rigidity of the machine body is greatly improved, the running precision of the sliding block is guaranteed, and the requirement for utilization of a high-precision fine blanking die is met; meanwhile, the forming rate of blanked parts is improved and the material waste cost is reduced; and the flatness, the surface smoothness and the size precision of the blanked parts are improved.

Description

technical field [0001] The invention relates to a hydraulic press with a vertical fuselage, in particular to a precision blanking hydraulic press capable of significantly improving the quality of blanking parts, and belongs to the technical field of forging machinery. Background technique [0002] Use a precision blanking press and a special fine blanking die to fine blank the sheet, so that the blanking area of ​​the sheet is in a special three-dimensional compressive stress state to obtain precise dimensions, flat surfaces and smooth shear surfaces, without Re-cutting is required, which can improve the processing efficiency and reduce the processing cost of parts. The advantages of fine blanking parts make them widely used in the body shell of automobiles and motorcycles and the stamping parts of computers. For fine blanking parts, the fine punching die installed on the three-action press must be used to press the plate first and then cut, so as to obtain high-quality f...

AI Technical Summary

Problems solved by technology

However, there are also the following problems: the gap between the column and the guide sleeve of the four-column hydraulic press is relatively large, and the rigidity of the four-column body is small, which cannot meet the requirements for the use of high-precision fine punching dies

From the attached drawings of the patent specification figure 2 It can be seen from the figure that the clamping forces of the upper push cylinder and the lower jack cylinder are not in the same axis, which cannot overcome the roughening or tearing of the punching surface that is easy to occur when the slider goes down to punch the plate, resulting in the failure of the punched parts. To the actual surface finish or dimensional accuracy requirements

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