A coaxiality assessment method for the dual maximum physical requirements of bore shaft parts

Abstract

The invention belongs to the field of precision metrology and computer application, in particular to a stable, fast and simple coaxiality evaluation method based on the principle of double tolerance,which can evaluate the case that the reference is a hole and the measured element is an axis. The invention comprises the following steps: 1, a plurality of parameter matrices are constructed by measuring points of a part to be measured to describe the geometric error of the part to be measured; 1.1, whether to analyze a reference section or a measured section is determined; Step 1.2, the parameter matrix of the reference section and the measured section are fused; 2, a key point is added; 3, an analysis matrix by using a set of key point is constructed; 4, the analysis matrix is analyzed to deicde whether to continue the optimization, and decide the optimization strategy; 5, an optimization direction is calculated; 6, whether to generate a new key point is decided to generate a new key point if necessary, and update part of the parameter matrix; 7, whether the coaxiality of the part to be tested is qualified based on the principle of double tolerance is calculated and judged.

Description

technical field [0001] The invention belongs to the field of precision measurement and computer application, and specifically relates to a stable, rapid and simple coaxiality evaluation method based on double maximum physical requirements for hole shaft parts, which can be used for the double maximum physical requirement coaxiality of hole shaft parts The evaluation results can provide guidance for the improvement of processing technology. Background technique [0002] Dimensional error and shape error (abbreviation of shape error and position error) directly affect product quality, assembly and service life. It is of great significance to quickly and accurately calculate part error. The relationship between dimensional tolerance (tolerance is the allowable range of error) and shape and position tolerance is called the tolerance principle, among which the maximum physical requirement is a tolerance principle that reflects the assemblability of parts. [0003] The national s...

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Problems solved by technology

However, this method is very sensitive to the initial value and is not always stable for the geometry evaluation task

[0013] To sum up, when the current geometric evaluation method is applied to the error evaluation of the coaxiality of the dual maximum physical requirements of the hole shaft parts, it cannot be stable, fast and simple in form at the same time.

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