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An Assembly-Oriented Method for Determining Evaluation Parameters of Rectangular Planar Shape Errors

A technology for evaluating parameters and plane shapes. It is used in electrical digital data processing, special data processing applications, instruments, etc. It can solve the problems of difficult parameters and many characterization parameters, and achieve the goal of improving assembly accuracy, improving processing quality, and optimizing assembly processes. Effect

Inactive Publication Date: 2019-01-01
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

However, due to the complexity of the three-dimensional surface, there are many characterization parameters, how to obtain the parameters related to the assembly accuracy is difficult

Method used

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  • An Assembly-Oriented Method for Determining Evaluation Parameters of Rectangular Planar Shape Errors
  • An Assembly-Oriented Method for Determining Evaluation Parameters of Rectangular Planar Shape Errors
  • An Assembly-Oriented Method for Determining Evaluation Parameters of Rectangular Planar Shape Errors

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Embodiment 1

[0052] An assembly-oriented method for determining the evaluation parameters of rectangular planar shape errors, such as image 3 As shown, the specific steps are as follows:

[0053] Step 1. The shape error of the part surface is obtained by the following method. The cutting surface is generated by the non-Gaussian plane simulation method, and the autocorrelation function R or the power spectral density function G of the given plane is used. z (ω x ,ω y ), get the system transfer function H(ω x ,ω y ), using the Johnson transformation system to obtain a random column η′ of non-Gaussian distribution with a certain skew and kurtosis, and using a computer to generate a non-Gaussian rough plane. Afterwards, the shape error surface is obtained by wavelet filtering; wavelet analysis is used, and the basis function Bior6.8 is used as the decomposed wavelet basis function to perform multi-scale separation of the feature information of the part's plane shape, and the shape error p...

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Abstract

The invention relates to a method for determining assembly-oriented rectangular plane shape error evaluation parameters and belongs to the field of error evaluation. The method comprises: generating a cutting surface by non-Gaussian plane simulation method, acquiring a shape error surface via wavelet filtering, and extracting characterization parameters of surface shape error distribution; subjecting the shape error surface to simulation assembly through contact algorithm, calculating assembly precision of spatial orientation changes of a second part after assembly, determining a relation between surface characterization parameters and post-assembly part assembly precision through correlation analysis, thereby determining shape error evaluation parameters and enabling quantitative description for the relation between the surface distribution characterization parameters and assembly precision. Plane characteristic parameters having important impact on assembly precision are obtained, and scientific basis is provided for improving machining quality of mating planes and optimizing assembly process to improve assembly precision.

Description

technical field [0001] The invention relates to an assembly-oriented method for determining error evaluation parameters of a rectangular plane shape, belonging to the field of error evaluation. Background technique [0002] In the assembly process of precision mechanical systems in our country, the shape error of parts is one of the important factors that affect the relative position accuracy of parts after assembly in the whole machine. In the modern manufacturing industry, the assembly workload accounts for 45% of the total manufacturing workload on average, and the assembly cost accounts for 20-30% or more of the total manufacturing cost. The research on the influence mechanism and coupling relationship of various factors in the processing and assembly links (ie, manufacturing characteristics) on the performance of the assembled system has gradually become a hot spot in research at home and abroad, and it is also a main direction that needs to be strengthened in manufactu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/20G06F2119/18
Inventor 张发平郭少伟张体广王戈张田会张凌雲樊红丽
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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