Method for positioning and monitoring wear of ball nose end mill cutter

Abstract

The invention discloses a method for positioning and monitoring wear of a ball nose end mill cutter and belongs to the field of monitoring wear of numerically-controlled milling cutters. The method is characterized by comprising the following steps: mounting a vision monitoring system on a numerically-controlled machine tool; collecting an image of the new ball nose end mill cutter prior to machining, pretreating the image, extracting data points on the cutting edge in the image, fitting the data points to obtain a straight line indicative of overall trend of the cutting edge, calculating the horizontal included angle of the straight line, rotating the new cutter image, and extracting the position of the cutter nose in the image after rotation; collecting an image of the worn cutter which maintains the same position and angle as those in the new cutter image; positioning circumferentially and positioning the cutter nose in the worn cutter image by use of the horizontal included angle and the cutter nose position, which are obtained by treating the new cutter image; and extracting current wear extent of the mill cutter. The invention is significant in that the method achieves the purpose of positioning the ball nose end mill cutter during the wear monitoring process of numerically-controlled milling cutters and completes on-line measurement of cutter wear.

Description

technical field

[0001] The invention relates to the problem of tool positioning and wear measurement in machine vision-based ball end milling cutter wear monitoring in numerical control machining, and belongs to the field of tool wear monitoring. Background technique

[0002] In the milling process, the wear of the tool has an important impact on the processing quality and efficiency, which directly hinders the further improvement of processing automation. The key to solving this problem lies in the development of tool wear monitoring technology. Tool wear monitoring can be divided into direct method and indirect method from the means of tool wear measurement. Generally speaking, the indirect method has strong real-time performance and can realize online synchronous monitoring. Commonly used indirect methods include cutting force method, machine tool power method, vibration method and acoustic emission method. The indirect method reflects the change of the amount of wear b...

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