Screening method for key geometric errors of forming gear grinding machine based on gear surface error model

A geometric error and error model technology, which is applied in the field of key geometric error screening of form grinding machines, can solve the problem that the key geometric error screening results are not completely reliable, etc.

Active Publication Date: 2018-12-18
CHONGQING UNIV +1
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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

Method used

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  • Screening method for key geometric errors of forming gear grinding machine based on gear surface error model
  • Screening method for key geometric errors of forming gear grinding machine based on gear surface error model
  • Screening method for key geometric errors of forming gear grinding machine based on gear surface error model

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Embodiment Construction

[0130] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

[0131] In this embodiment, the screening method for key geometric errors of profile gear grinding machines based on the tooth surface error model includes the following steps:

[0132] Step 1: Establish tooth surface error model based on machine tool kinematic chain and form conjugate grinding theory

[0133] According to the homogeneous transformation matrix, the pose transformation relationship between the adjacent parts of the machine tool is established; based on the kinematic chain of the machine tool, the pose transformation relationship between the gear coordinate system and the grinding wheel coordinate system is obtained by using the matrix multiplication method; then cons...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23F9/02B23F23/00B23Q15/14
CPCB23F9/025B23F23/00B23Q15/14
Inventor 夏长久王时龙康玲孙守利林晓川于春建方成刚黄筱调
Owner CHONGQING UNIV
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