Internal polyhedron manufacturing method based on punching and cutting process

Abstract

The invention relates to an internal polyhedron manufacturing method based on a punching and cutting process. The method comprises the following steps of optimally using a normal hexahedron to transfer a torque; then reducing back engagement of a cutting edge by enlarging a prefabricated bottom hole so as to achieve a purpose of reducing the cutting force; then establishing a less cutting model toanalyze a change characteristic of the method; then determining the minimum back engagement of the cutting edge according to a manufacturing error standard of the normal hexahedron and a wrench; andfinally, controlling the reasonable back engagement of the cutting edge and the diameter of the prefabricated bottom hole by way of an amplified coefficient or a preferred coefficient according to thesize of a load. Machined by adopting the normal hexahedron and combining with a less cutting manufacturing method, on the premise of guaranteeing the service performance, the cutting force is reduced, precision reduction due to large punching and cutting forces is eliminated, interference to strength design of a part is avoided, and meanwhile, the manufacturing energy consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of punching manufacturing, in particular to a method for manufacturing an inner polyhedron based on a punching process. Background technique [0002] The mass production of internal polyhedrons of standard parts mostly adopts the method of upsetting, and the method of small trial production or special-shaped non-standard is generally not suitable for upsetting due to process restrictions. 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 threaded cartridge valves, hydraulic servo control system devices, and instruments, there are a large number of precise and slender rods used for adjustm...

AI Technical Summary

Problems solved by technology

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 threaded cartridge valves, hydraulic servo control system devices, and instruments, there are a large number of precise and slender rods used for adjustment, feedback, and fastening. The precision CNC machine tool completes the processing of all geometric elements except the inner polyhedron at one time, and finally uses the hydraulic press alone to complete the processing of the inner polyhedron

The cutting force when punching the inner polyhedron directly affects the precision formed by the previous processing and the design requirements for the strength of the part itself. In order to avoid punching deformation, the radial dimension of the matrix will be increased according to the punching force during design, resulting in Waste of material and unnecessarily impact other designs

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