Broaching surface quality evaluation method based on chip bending degree measurement

Abstract

The invention discloses a broaching machining surface quality evaluation method based on chip bending degree measurement. The evaluation method comprises the following steps: 1, collecting cuttings in a broaching process, and carrying out edge extraction to obtain an edge characteristic curve of the cuttings; 2, extracting a plurality of feature points on the edge feature curve obtained in the step 1; 3, measuring the distance L from each feature point to the starting point of the edge feature curve and the curve length S; and 4, carrying out quadratic function fitting on the distance L and the curve length S corresponding to each measured feature point to obtain a cutting morphological feature curve. And 5, taking the distance corresponding to the highest point of the chip morphological characteristic curve as the characteristic height h. And the feature height h is substituted into a surface roughness-feature height relation function obtained through pre-fitting, and the surface roughness of the broaching machining face during cutting is obtained. According to the invention, the direct measurement object is the cuttings generated in broaching, so that the real-time evaluation of the quality of the machined surface of the workpiece can be realized when the machining of the workpiece is not finished.

Description

technical field [0001] The invention belongs to the field of broaching surface quality evaluation, and in particular relates to a broaching surface quality evaluation method based on the measurement of the bending degree of chips. Background technique [0002] Broaching technology has the advantages of high machining accuracy, wide machining range, high production efficiency and simple operation, and is widely used in high-precision machining and manufacturing fields such as marine equipment, auto parts, aerospace equipment and nuclear industry. However, due to the increasingly fierce competition in the global industrial market, the products are becoming more and more complex, and the requirements for processing quality are getting higher and higher, and the high-precision standards of key components are gradually rising. The surface processing quality of the current broaching workpiece is mainly evaluated by the surface roughness. Common test methods for surface roughness ...

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Problems solved by technology

It can be seen from the above publications that many researchers have paid attention to the evaluation method of machined surface quality, but none of the above studies have paid attention to the relationship between chip shape and machined surface quality

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