Large-pitch screw turning process system comprehensive frequency response function equation construction method

Abstract

The invention relates to a large-pitch screw turning process system comprehensive frequency response function equation construction method. The method comprises steps: a tool-machine feed system subsystem frequency response function model is constructed; 2, a workpiece-machine spindle subsystem frequency response function model is constructed; 3, through linear superposition of the tool-machine feed system subsystem frequency response function and the workpiece-machine spindle subsystem frequency response function in a corresponding direction, a large-pitch screw turning process system comprehensive frequency response function equation is constructed. In consideration of influences on dynamic characteristics of the processing system by the machine, the tool and the workpiece comprehensively, a concept of generalized dynamic space is put forward, the space scale of the dynamic study is expanded, and based on the generalized dynamic space large-pitch screw turning process system comprehensive frequency response function equation construction method, the vibration characteristics of the turning system can be characterized more accurately, and the dynamic behaviors of the whole process system are reflected.

Description

technical field [0001] The invention relates to a method for constructing a comprehensive frequency response function of a cutting system, in particular to a method for constructing a comprehensive frequency response function equation of a large-pitch screw turning process system, belonging to the technical field of screw turning. Background technique [0002] As the main component of large presses, large-pitch screw plays a key role in the manufacturing and forging of key components in nuclear power, aerospace and large ships. The large-pitch screw has the processing characteristics of long thread processing size, large radial depth of cut and high feed speed. During the turning process, the processing method of low speed and layered cutting is adopted. Due to the long stroke and multi-directional cross-feed turning in the machining process, the vibration characteristics are complex and changeable, which has a great impact on the machining accuracy and roughness of the larg...

AI Technical Summary

Problems solved by technology

Due to the long stroke and multi-directional cross-feed turning during the machining process, the vibration characteristics are complex and changeable, which greatly affects the machining accuracy and roughness of the large-pitch screw, and at the same time affects the service life of the tool system.

[0003] At present, most of the research on vibration in the cutting process takes the machine tool, tool, workpiece, spindle-tool holder-tool, tool-workpiece or machine tool-workpiece as the research objects, and establishes corresponding vibration equations and dynamic models, but none of these models Considering the comprehensive influence of the machine tool, tool and workpiece on the dynamic characteristics of the machining system, it cannot reflect the dynamic behavior of the entire process system

[0004] In view of the fact that high-feed cutting technology and existing equation establishment methods cannot reflect the status quo of the dynamic behavior of the entire machining system

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