A coaxiality evaluation method for the dual minimum physical requirements of bore shaft parts

Abstract

The invention belongs to the field of precision metrology and computer application, in particular to a method for evaluating coaxiality required by double minimum entity of stable, fast and simple hole shaft parts, which can evaluate the condition that the standard is the shaft and the measured element is the hole. The invention comprises the following steps: step 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, determining whether to analyze a reference axis or a measured hole; Step 1.2, fusing the parameter matrix of the reference axis and the measured hole; 2, adding a key point; 3, constructing an analysis matrix by using a set of key point; 4, analyzing the analysis matrix, deciding whether to continue the optimization, and deciding the optimization strategy; 5, calculating an optimization direction; Step 6, deciding whether to generate a new key point, generating a new key point if necessary, and updating part of the parameter matrix; Step 7, calculating and judging whether the coaxiality of the part to be tested based on the principle of double minimum entity isqualified or not.

Description

technical field [0001] The invention belongs to the field of precision measurement and computer application, and specifically relates to a stable, fast and simple coaxiality evaluation method based on double minimum physical requirements for hole shaft parts, which can be used for the double minimum 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 minimum physical requirement is a tolerance principle that reflects the assemblability of parts. [0003] The national st...

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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] In summary, when the current geometric evaluation method is applied to the error evaluation of the coaxiality of the dual minimum physical requirements of the hole shaft parts, it cannot be stable, fast and simple in form at the same time.

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