Circumference distribution hole group position degree evaluation method based on coordinate conversion and array sorting

Abstract

The invention discloses a circumference distribution hole group position degree evaluation method based on coordinate conversion and array sorting. The method is characterized by arbitrarily selectingone hole on a component to be tested of a revolved body type possessing a circumference distribution hole group as a tangential reference, acquiring the position information of component circumference distribution holes, establishing a coordinate system, and according to a tolerance requirement, finding the ideal tolerance circle of each hole; in the coordinate system, calculating the hole centerdistances of the holes and the included angle of each hole center connection line; using the hole center connection line of the first hole to draw a circle, equally dividing an intersected arc and using each equal diversion point to determine a multi-group position after the hole group is rotated; calculating the position degree error of the hole located at the multi-group position hole groups; and carrying out bubble sorting, acquiring the accurate position degree error value of the component hole group, and accurately evaluating the position degree of the component to be tested of the revolved body type possessing the circumference distribution hole group. In the invention, a measurement range is wide, detection cost is low, measurement efficiency is high, a processing mode is simple, the tangent offset direction of each hole does not need to be determined, and the accurate position degree error of each hole can be acquired.

Description

technical field [0001] The invention belongs to the technical field of quality detection of rotary parts with circularly distributed hole groups, and in particular relates to a method for evaluating the position degree of circularly distributed hole groups based on coordinate transformation and array sorting. Background technique [0002] In the machining industry, rotary parts are a very important class of parts, which are widely used in industries such as automobiles, aviation, ships, and industrial robots. These parts are often distributed with circumferentially uniform holes, such as figure 1 As shown in the figure, (a) shows the schematic diagram of parts with circumferentially distributed hole groups, (b) shows the cross-sectional view of parts after being cut by rotation, and (c) shows the schematic diagram of the tolerance zone of parts. In order to ensure the assembly relationship between parts , The hole group generally needs to be processed very precisely. [000...

AI Technical Summary

Problems solved by technology

The qualification of the workpiece is judged by the special gauge, which is simple and easy to operate, but this method can only evaluate whether the workpiece is qualified or not, and cannot measure the accurate value of the position error

The three-coordinate measuring machine is a typical representative of coordinate measurement. It can accurately measure the position coordinate information of complex structures and hole groups, but the measurement cycle is long and the cost is high. It is suitable for offline sampling inspection of parts and has strict requirements on the measurement environment. requirements, unable to meet the online measurement of the production line

In recent years, the research on a special measuring instrument for certain parts has been greatly developed. This kind of special measuring instrument generally uses supporting special software to realize data processing, and the algorithm evaluation of position degree is more complicated.

[0005] In actual detection, if different holes are selected as tangential positioning references, the tangential deviation values ​​of the same hole are generally different, which causes a large error in the final measurement of the workpiece and easily leads to misjudgment

According to different design requirements, the traditional evaluation method evaluates the position degree of the circumferential hole group through translation or rotation in the polar coordinate or rectangular coordinate system for coordinate transformation. During the evaluation process, it is necessary to find the extreme point of rotation and judge the direction of rotation. The direction of rotation and the angle of rotation are related to the tangential error of each hole. Due to the randomness of workpiece processing, the offset direction of each hole in the tangential direction of each workpiece is uncertain. The judgment of the rotation direction needs to be based on the specific situation of the workpiece, and the processing method is complicated. Changeable, difficult to grasp

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