Machine tool machining cutter three-dimensional abrasion on-line monitoring method

Abstract

The invention discloses a three-dimensional abrasion on-line monitoring method for a machine tool machining cutter. The method is suitable for monitoring the abrasion amount of the machine tool machining cutter obtained through a three-dimensional measurement method. The method mainly comprises the following steps of: respectively measuring a three-dimensional point cloud model without abrasion and a three-dimensional point cloud model after abrasion by using a fringe projection method; respectively extracting angular points of two surfaces of the cutter in the point cloud model, and carrying out registration and alignment on the point cloud model; performing different Boolean operation on the point cloud model based on a K-D tree and a DBSCAN algorithm, and performing calculation to obtain a three-dimensional point cloud model structure of the abrasion area; the abrasion damage volume is extracted according to an O-C tree grid division method, and parameter extraction is conducted on abrasion damage characteristic quantities such as a KT value, the average abrasion damage amount of the front tool face, a VB value and the average abrasion damage amount of the rear tool face according to point-surface characteristics. According to the method disclosed by the invention, an innovative scheme is adopted in links such as point cloud registration of different visual angles, point cloud registration of different models and wear damage volume extraction, so that the method has both robustness and efficiency.

Description

technical field [0001] The invention belongs to the field of on-line monitoring of machining conditions, and in particular relates to an on-line monitoring method for tool wear and tear in machine tool machining. Background technique [0002] The wear and tear of the machine tool tool has an extremely important influence on the quality of the processed workpiece. When the tool wear and tear reaches a certain level, the tool needs to be scrapped. At present, the measurement systems for the wear and tear of machine tools can be divided into indirect measurement methods and direct measurement methods according to different measurement methods. Among them, the indirect method refers to the use of sensors such as acceleration, vibration, strain force, piezoelectricity and power to detect the motor power, cutting force, vibration signal, etc. to indirectly represent the tool wear and damage state, that is, to establish a certain empirical relationship based on the parameters trans...

AI Technical Summary

Problems solved by technology

The wear and damage information extracted by the three-dimensional reconstruction method is more intuitive and rich, but there are few researches on three-dimensional reconstruction methods for cutting tools at home and abroad, and the existing research methods still have the following shortcomings: the measurement method is low-precision measurement methods such as binocular systems. Therefore, the accuracy of the data acquisition results of the worn and damaged area is low; the registration method of the standard tool point cloud model and the worn and damaged tool point cloud model usually includes processes such as rough registration and ICP fine registration, and the algorithm is complex and the degree of self-adaptation is low; The extraction of worn and damaged areas needs to convert the data format from point cloud to triangular mesh, and the conversion process is usually complicated and time-consuming

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