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...

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 screw-in cartridge valves and hydraulic servo control system devices, there are a large number of precise and slender rods used for adjustment, feedback, and fastening. Due to the limitations of their own structural characteristics and application occasions, the tightening can only be adjusted in the form of an inner hexahedron. At the same time, due to the influence of precision requirements, the center-type precision CNC machine tool can only be used to process all the other geometric elements except the inner hexahedron at one time, and finally the inner hexahedron is processed by hydraulic press alone

The cutting force when punching the inner hexahedron directly affects the precision formed by the previous processing and the design requirements for the strength of the part itself. The diameter of the prefabricated bottom hole in traditional punching is smaller than the opposite side size of the inner hexahedron. According to the traditional inner hexahedron structure After the basic size is selected, the punching force is also determined. In order to avoid punching deformation, the radial dimension of the matrix will be increased according to the punching force during design, resulting in material waste and unnecessary impact on other designs

Images