Method for realizing extraction of comprehensive errors and determination of compensation values for jig system

Abstract

The invention discloses a method for realizing extraction of comprehensive errors and determination of compensation values for a jig system, and relates to the field of mechanical processing. The method includes the following steps of: acquiring a comprehensive error parameter model of the jig system; establishing an on-machine detection platform, and determining the position and the posture deviation delta qW of a workpiece below a machine tool coordinate system on the basis of an on-machine detection technique and the comprehensive error parameter model of the system; establishing a comprehensive error compensating model of the jig system according to a coordinate transformation theory, and determining compensation values of the machine tool in three directions at each point of the motion track of a cutter by compensating operation. The method clearly and simply clarifies the mapping relation between the jig system error and the workpiece posture offset, and has a sufficient theoretical basis; a concise and precise error extraction method is provided; the precise measurement and calculation of jig errors can be realized. According to the method, the real-time processing compensation can be carried out, and the processing precision is further improved.

Description

technical field [0001] The invention relates to the field of machining, in particular to a method for realizing comprehensive error extraction of a fixture system and determining a compensation value. Background technique [0002] A fixture is a device used to position and clamp a workpiece during machining. It plays a very important role in shortening the manufacturing cycle and ensuring the processing quality, and thus reduces the production cost. However, the error in the fixture system has become one of the important factors affecting the processing quality. [0003] The positioning element of the fixture is used to establish the reference coordinate system, and the tool moves according to the machine tool coordinate system. When there is an error in the positioning element, the reference coordinate system will be offset and rotated, so that the phenomenon of misalignment with the machine tool coordinate system will occur, resulting in a pose deviation of the workpiece...

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Problems solved by technology

[0013] The above models are essentially the prototype or extension of the model given by (Asada, 1985). The shortcoming is that although the established error models are different, they do not give the extraction method of the fixture error, that is, all the models are Based on known fixture errors

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