Multi-axis numerical control machine tool C-axis geometrical error measuring system and parameter identification method

Abstract

The invention relates to a multi-axis numerical control machine tool C-axis geometrical error measuring system and a parameter identification method. A motion equation with geometrical error and a motion equation under an ideal state are established under radial, tangential and axial three linkage modes by aiming at the structure and the characteristics of the multi-axis numerical control machine tool C-axis and by using a multibody system theory according to the working principle of a ball bar instrument, the two-end coordinates of the ball bar instrument are expressed into the same coordinate system separately through the variable quantity of the two-end positions of the ball bar instrument, and the actual distance between the two points is evaluated, so that the relation between a theoretical model and an actual measurement value is established and identification of eight geometrical error parameters of the C axis is realized. All the error items of the rotary C axis are identified, the coupling phenomenon existing in the geometrical error parameters is solved, accuracy and rapidness are realized, the identification precision is high, and important theoretical significance and practical significance in realizing the rest rotating shafts of the multi-axis numerical control machine tool are achieved.

Description

technical field [0001] The invention relates to a geometric error parameter identification and measurement system and method, which are suitable for the C-axis of the rotation axis of a multi-axis numerical control machine tool, and realize the identification of geometric error parameters by establishing the relationship between a theoretical mathematical model and an actual measurement value. Background technique [0002] In modern manufacturing, multi-axis CNC machine tools can simultaneously adjust the cutting position and direction of the tool relative to the workpiece. Therefore, compared with traditional three-axis CNC machining, multi-axis CNC machine tools have higher cutting efficiency and machining accuracy, and play an important role in processing complex parts in the fields of aviation, aerospace, energy and national defense. Horizontal technological breakthrough. [0003] However, due to the addition of rotating axes to multi-axis CNC machine tools, the geometr...

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Problems solved by technology

[0003] However, due to the addition of rotating axes to multi-axis CNC machine tools, the geometric error parameters increase significantly, and there are complex coupling relationships between them.

Therefore, it brings great difficulties to the identification of geometric error parameters, and at the same time puts forward higher requirements for error identification methods. At present, there are relatively few identification methods for the rotation axis, and most of them have carried out the error parameters in the model. Simplification, ignoring the coupling between various error parameters, resulting in a decrease in identification accuracy

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