Inner hexahedron punching manufacturing method

Abstract

The invention discloses a few-cutting manufacturing method for an inner hexahedron. The method comprises the steps that firstly, the back engagement of the cutting edge is reduced by enlarging a prefabricated bottom hole, so that the purpose of reducing cutting force is achieved, then the change characteristic of the method is analyzed by establishing a small-cutting-amount model, the minimum backengagement of the cutting edge during manufacturing is determined according to the manufacturing error standard of an inner hexahedron and a wrench, and finally the reasonable back cutting depth andthe diameter of a prefabricated bottom hole are controlled in an amplification coefficient or optimization coefficient mode according to loads. A few-cutting manufacturing method is adopted for machining the inner hexahedron, on the premise that the using performance of the inner hexahedron is guaranteed, the cutting force is reduced, precision reduction caused by too large punching force is eliminated, interference on the strength design of parts is avoided, and meanwhile manufacturing energy consumption is reduced.

Description

technical field

[0001] The invention relates to the technical field of punching manufacturing, in particular to a punching manufacturing method of an inner hexahedron. Background technique

[0002] The batch production of standard fasteners such as screws and bolts with internal hexahedrons mostly adopts the upsetting method, and the small-quantity trial production or special-shaped non-standard products that are not suitable for upsetting due to process restrictions generally use punching. Punching requires prefabricated bottom holes, and the punching process is arranged after the previous machining, which will bring greater impact to the matrix of semi-finished parts, resulting in deformation of the matrix, especially for slender rods, the punching force is too high The assembly causes the disappearance of the precision of the front processing. However, in screw-in cartridge valves and hydraulic servo control system devices, there are a large number of precise and slender...

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