Analysis and Research on the identification method

2022-09-23
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Analysis and Research on tool wear identification method

in the process of metal cutting, tool wear inevitably exists. With the wear of the tool, the geometric parameters and other properties of the tool will change accordingly, resulting in the change of cutting conditions, which will have a negative impact on the machining process and product quality. With the continuous improvement of mechanical manufacturing automation, the research on tool wear identification method is of great significance to ensure the processing quality and process

1 main causes of tool wear

in the cutting process, the cutting conditions of the tool are different, and the causes of wear are also different. Tool wear is often the combined result of mechanical action, thermal action and chemical action after the completion of small-scale and pilot production. So far, it is believed that the causes of tool wear mainly include hard spot wear, bonding wear, diffusion wear, chemical wear and thermoelectric wear

2 influence of tool wear on machining

with the continuous cutting process, tool wear also gradually increases. Tool wear will increase the cutting force, increase the cutting temperature and the degree of advanced non-ferrous materials, reduce the machining quality of the workpiece surface, and affect the normal progress of the whole machining process

(1) cutting force increases due to tool wear. Due to wear, the back angle of the tool decreases, the product of the back tool contacting the workpiece increases, and the arc radius of the tool tip also increases, making the tool blunt and increasing the friction between the tool and the workpiece, thus causing the cutting force to increase

(2) tool wear causes the cutting temperature to rise. Tool wear will worsen the cutting effect and intensify the friction between the tool and the workpiece, resulting in the increase of cutting temperature, which not only affects the processing quality, but also intensifies the diffusion wear, oxidation wear and plastic deformation of the tool with low stress corrosion cracking sensitivity

(3) workpiece size deviation caused by tool wear. When the radial wear of the tool NB is increased, the actual cutting depth will be less than the nominal cutting depth, resulting in the deviation of the workpiece size, especially in the finishing machining, attention should be paid to this

(4) tool wear reduces the quality of the workpiece table. After the tool is worn, the plastic deformation of the surface of the workpiece intensifies, resulting in greater residual stress. At the same time, the roughness of the workpiece surface will increase due to the bonding between the tool and the workpiece, the scratch of some hard points on the workpiece surface during cutting, and the vibration generated during cutting

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