An Efficient Compensation Method for Key Grinding Errors

Abstract

The invention discloses a grinding critical error efficient compensation method. The method comprises steps of first, establishing an actual forward kinematics model for grinding processing accordingto geometric error distribution of a forming grinding machine and a machine actual kinematic chain, and reflecting a functional relationship between a cutter posture in a cutter coordinate system andcutter position data in a workpiece coordinate system under impact of geometric errors; then deducing an analytical expression of a motion axis actual motion instruction after error compensation basedon an actual inverse kinematic compensation principle, and disclosing a mapping law among the geometric error, ideal cutter position data and actual motion instruction; and finally, establishing a geometric error-tooth surface error model according to a conjugate grinding principle, calculating and evaluating actual tooth profile and tooth direction precision, and identifying a key error source of s tooth profile error. An actual inverse kinematic compensation method is simplified, and tooth profile deviation reduction-oriented efficient error compensation is realized.

Description

technical field [0001] The invention relates to the technical field of error analysis and precision control of numerical control machine tools, in particular to an efficient compensation method for key errors of gear grinding. Background technique [0002] CNC form gear grinding machine is a special machine tool for gear finishing. The gear grinding accuracy is affected by multi-source errors, including machine tool geometry error, thermal error, force error, servo control error, etc. Among them, the geometric error is considered to be a quasi-static error, which does not change or changes slightly with time, and can be eliminated by compensation. [0003] In order to compensate the geometric errors of multi-axis machine tools, experts and scholars have proposed a large number of methods, including differential operator decoupling methods, iterative regression calculation methods, differential error prediction methods, etc. The existing error compensation methods are ineffi...

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Problems solved by technology

However, the form gear grinding machine is a special processing machine tool for gears. Although the structure of the machine tool is not special, due to the processing characteristics such as spiral grinding and conjugate contact, as well as the particularity of the gear accuracy evaluation index, there is currently no special tool for form grinding gear. Geometric Error Compensation Method Based on Practical Inverse Kinematics

[0005] In addition, the existing actual inverse kinematics method is to compensate for the influence of geometric errors on the tool position data. Since the actual grinding process is not considered, the final improvement of the single grinding accuracy evaluation index may not be completely ideal.

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