A method of axially layered cutting of large-pitch threads, a tool wear test method, and a method for calculating mechanical and thermal loads

Abstract

The invention discloses an axial layered cutting method for turning coarse-pitch threads, a tool wear testing method and a force-heat load calculating method of tool wear for eliminating principle errors caused by radial layered cutting of the coarse-pitch threads. The axial layered cutting method for turning the coarse-pitch threads, the tool wear testing method and the force-heat load calculating method of tool wear are technically characterized in that through the cutting method, a testing tool with a left cutting edge and a right cutting edge is used for axially turning a left thread surface and a right thread surface of a coarse-pitch test piece in a layered mode, wear tests of the tool turning the coarse-pitch threads are conducted through the cutting method, the wear pattern of the tool turning the coarse-pitch threads is obtained, the influence of tool wear on thread machining surfaces is revealed, then a finite element analytical model of the tool is reconstructed according to the flank wear data of the tool and the blunt round radius measurement data of the cutting edges, analysis and calculation of the temperature field and the stress field of the tool are carried out, and the force-heat load change characteristic on the tool wear condition is obtained.

Description

[0001] Technical field: [0002] The present invention relates to a large-pitch thread turning method and its tool wear, mechanical and thermal load testing and calculation methods, in particular to a large-pitch thread axial layered turning method, an experiment and test method for turning large-pitch thread tool wear, and The construction and calculation method of the mechanical and thermal load analysis model of tool wear. [0003] Background technique: [0004] As a large-scale press adjustment component, the large-pitch screw controls the parallelism and perpendicularity between the upper mold and the lower mold in the press, which has an important impact on the static and dynamic accuracy of the press machine. The existing large-pitch thread turning mainly adopts the radial layered cutting method, which uses the tip of the tool for cutting, and controls the position accuracy of the tool tip to form the surface of the large-pitch thread, which has the advantages of easy CN...

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Problems solved by technology

[0005] When the axial layered cutting method is used to finish the large-pitch thread, if all the finishing allowance is removed by one cutting, the cutting force generated will be large, which will affect the quality of the machined surface and the machining accuracy; in order to improve the machining accuracy; When the sub-layered cutting method is used to finish the large-pitch thread, too many times of cutting will aggravate the wear of the tool

[0006] In the process of large-pitch thread cutting, there is an interactive relationship between mechanical and thermal loads and tool wear; the tool is in constant contact with the workpiece and chips, and there is a high cutting temperature and pressure in the contact area. The mechanical and thermal loads on the tool are The main cause of its wear; at the same time, tool wear will cause changes in its mechanical and thermal loads; at present, the research on tool wear mainly focuses on the influence of mechanical and thermal loads on tool wear, ignoring the influence of tool wear on mechanical and thermal loads. The tool thermal load analysis model and boundary conditions used are the model and data in the initial cutting state of the tool, and the change characteristics of the thermal load with the increase of cutting stroke and tool wear cannot be obtained correctly, and the axial multiple layered turning with large pitch There are deficiencies in the experimental method of thread tool wear and the calculation method of mechanical and thermal loads

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