Evaluation method of part flatness error based on minimum area

Abstract

The invention discloses an evaluation method of a part flatness error based on a minimum area method. The evaluation method comprises the steps of measuring and obtaining coordinates of measuring points on a measured plane, giving an initial parameter of the plane, enquiring the measuring points contacted with an error containing area according to the distances from the points to the plane, projecting the measuring points into a designated plane and converting into straightness error calculation in the designated plane by a coordinate system transformation method according to the quantity and the relative positions of the contact points, searching the measuring points contacted with the containing area and satisfying a straightness error discretion rule through the rotation change of the containing area in the projection plane, obtaining a rotated containing area, redefining a projection plane, conducting iterative calculation sequentially according to the straightness error calculation till a flatness discretion rule is satisfied, and outputting the flatness error and an optimal value corresponding to an ideal plane parameter. With the adoption of the evaluation method, the flatness error satisfying a minimum area discretion rule can be accurately calculated.

Description

Technical field [0001] The invention discloses a method for evaluating the flatness error of a part based on a minimum area, which belongs to the field of precision measurement and computer application, and can be used for the qualification detection of plane elements in geometric products under various conditions, and is an improvement of the processing process and the processing technology. Provide guidance. Background technique [0002] Flatness error is an important evaluation index for the plane accuracy of parts, which is widely used in work platforms, machine tool rails and various flat parts. Commonly used evaluation methods for flatness are: least square method, minimum area method, three-point plane method and diagonal plane method. Only the minimum area method meets the tolerance definition, and the calculation result is the smallest and unique. International ISO standards and most national standards stipulate the minimum condition as the arbitration criterion for th...

AI Technical Summary

Problems solved by technology

Due to the shortcomings of these methods, such as poor calculation stability, low calculation efficiency, limited number of sampling points, and difficulty in achieving accurate solutions for calculation results, it is difficult to apply the minimum area method in actual detection.

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