Method for predicting and simulating errors of end-milled surface

Abstract

The invention discloses a method for predicting and simulating errors of an end-milled surface. The method includes the steps that various influence factors causing the machining deformation errors in the end-milling cutting process are analyzed, and a machined-surface single-factor and multi-factor error vector model and an error accumulation vector relation model are built in cooperation with end-milling characteristics; by virtue of a calculation and simulated analysis method, based on a solving method for the machined-surface flatness errors, according to a least regional method, the flatness errors are calculated with a self-adaptation genetic algorithm based on real number encoding, verification is carried out through living example calculation, and contrastive analysis is carried out on the errors and errors of a traditional genetic algorithm. The method is simple and convenient to operate, and the problems that heat stress is caused by cutting heat, residual stress is caused by unloading and loading loads, strict quantitative or logical relationships do not exist between the heat stress and the residual stress, and great difficulty is brought to analysis of the machined surface errors are well solved.

Description

technical field [0001] The invention belongs to the technical field of end milling, in particular to a surface error prediction and simulation method for end milling. Background technique [0002] Among the many error sources, the machining deformation error caused by cutting force, cutting heat, clamping, stress, etc. is closely related to the cutting process, and its impact on machining accuracy is difficult to reduce by improving the structure or material of the machine tool. Therefore, research on the relationship between the above error sources and machining deformation error is one of the prerequisites for accurate prediction, control and improvement of machining accuracy. [0003] The processing objects of end milling are mainly large-sized planes on large and medium-sized parts such as boxes, racks, and bed bodies. The error of the machined surface caused by processing deformation is the main form of end milling processing errors. [0004] Cutting force is one of th...

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Problems solved by technology

[0019] The purpose of the embodiments of the present invention is to provide a surface error prediction and simulation method for end milling, which aims to solve the thermal stress caused by cutting heat, the residual stress caused by unloading and clamping load, etc., but most of them do not have strict quantification Or logical relationship, which brings great difficulties to the analysis of machining surface errors

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