Screening Method for Key Geometric Errors of Form Grinding Machine Based on Tooth Surface Error Model

Abstract

The invention discloses a screening method for key geometric errors of a forming gear grinding machine based on a gear surface error model. The screening method comprises the following steps that step1, a gear surface error model is established, specifically, step 11, geometric errors are defined, step 12, the geometric errors are considered, and the pose transformation between a grinding wheel coordinate system and a gear coordinate system is calculated; and step 13, according to a forming conjugate grinding principle, the gear surface error model is established; and step 2, the key geometric errors which affect the grinding precision of a gear are screened, specifically, step 21, according to the gear surface error model, a first-order sensitivity index is used for representing the contribution rate of a single parameter to a model output variance, and a higher-order sensitivity index is used for representing the contribution rate of the coupling effect of multiple parameters to themodel output variance; meanwhile, the individual effect of the single parameter and the coupling effect with other parameters are considered, and a global sensitivity index is used for representing the comprehensive contribution rate of the parameter to the model output variance; and step 22, a modified Sobol method is adopted, and the first order sensitivity index and the global sensitivity index are calculated based on Monte-Carlos estimated valves.

Description

technical field [0001] The invention belongs to the technical field of error analysis and precision control of numerically controlled machine tools, in particular to a screening method for key geometric errors of form gear grinding machines based on tooth surface error models. Background technique [0002] Large-scale precision gears are widely used in power transmission systems of high-end equipment such as wind power, ships, aerospace and heavy machinery, directly affecting the service performance and reliability of the equipment. With the increasing requirements on the service life, safety and reliability of equipment, the precision performance of gear making equipment must be controlled and enhanced. Five-axis CNC form gear grinding machine is a typical equipment for finishing large-scale gears. It is widely used due to its advantages of high production efficiency and easy tooth surface modification. However, the machining accuracy of the machine tool is affected by mul...

AI Technical Summary

Problems solved by technology

However, due to problems such as motion interference in actual machining, for complex gear helical tooth surface machining, the relative pose error between the tool and the workpiece is not enough to accurately describe and replace the machining error

Obviously, the key geometric error screening results based on the pose error are not completely reliable

In addition, even if the error model has been successfully established, how to accurately and effectively screen out key errors is still a big problem

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