A Compensation Method for Geometric Errors in Five-Axis Ball Head Milling

Abstract

The invention discloses a five-axis ball-end milling geometric error compensation method and belongs to the machine tool error compensation field. The method includes the following steps that: with the structural parameters of a five-axis numerical control machine tool considered, the forward kinematics equation and post-processing program of the five-axis numerical control machine tool are established; a workpiece ideal cutter pose file is obtained according to a workpiece machining code and on the basis of the forward kinematics equation; transformation relationships between ball-end millingcutter poses and cutter contact points representing workpiece texture are established; a five-axis ball-end milling integrated geometric error analytical model is established according to the exponential product theory; cutter contact point safeguard measures are established for five-axis ball-end milling geometric error compensation; a swarm intelligence optimization algorithm is applied to obtain a compensated rotation axis angle; the translational axis motion amount of the compensated rotation axis angle is calculated; and the workpiece ideal cutter pose file is read, and a compensation matching code is calculated. With the method of the invention adopted, workpiece texture quality can be ensured when geometric error is compensated, and therefore, the machining precision of the five-axis machine tool and workpiece surface quality can be further improved.

Description

technical field [0001] The invention relates to the field of numerical control machining error compensation, in particular to a milling geometric error compensation technology. Background technique [0002] Five-axis milling has unique advantages in complex surface processing and manufacturing, and has been widely used in the processing of complex parts in various fields such as aerospace, aviation, navigation, automobiles, and national defense. Five-axis milling high-precision manufacturing has also become one of the important symbols to measure a country's advanced manufacturing level. The machining accuracy of five-axis milling is affected by many factors, among which geometric error and thermal error are one of the main error sources, accounting for about 60% of the total manufacturing error. Due to the characteristics of high systematicness, good repeatability, long-term stability and easy measurement of geometric errors, geometric error compensation has become an econ...

AI Technical Summary

Problems solved by technology

In the process of error compensation, adjusting the processing code or tool pose without restraint may cause irregular changes in the surface processing texture and may also cause large angle changes in the rotation axis, causing the tool to leave potholes on the workpiece surface during actual cutting trace

At present, there are few studies on surface texture changes caused by correcting the movement amount of the motion axis in five-axis milling error compensation, and there is also a lack of corresponding countermeasures

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