Cutting Force Coefficient Identification Method Based on CNC Machine Tool Spindle and Servo Axis Power

Abstract

The invention discloses a cutting force coefficient identification method based on numerical control machine tool main shaft and servo shaft power. Through a current sensor and a voltage sensor which are arranged on a machine tool main shaft motor and a servo feed shaft motor, corresponding current and voltage data is acquired. And through further calculating, motor power is acquired. Through linear fitting, an expression function is acquired and then a cutting force coefficient of each shaft is obtained. The method is convenient and is suitable for the numerical control lathe cutting process application field. Power testing is used to replace cutting force testing. High-specification high value measurement systems, such as a dynamometer and the like, are not needed. Used measurement apparatuses mainly include the current sensor, the voltage sensor and one data collection card. A whole set of apparatus can be constructed flexibly and a price is low.

Description

Technical field: [0001] The invention relates to the technical field of metal cutting, in particular to a cutting force coefficient identification method based on the power of a CNC machine tool spindle and a servo shaft. Background technique: [0002] The cutting force coefficient is an important parameter to evaluate the cutting force. The cutting force coefficient is used to express the cutting force required by the tool to remove the material per unit area in the cutting process, and it is related to the material to be cut, the tool, and even the machine tool. It can be used to characterize the machinability of materials, the cutting performance of tools, and the rigidity of machine tools. It is usually used as an empirical formula, data book or database to find, so that it is convenient for technicians to check the strength of tools or machine tools, determine the energy consumed to remove materials, or use it as an input condition for predicting cutting chatter in cutt...

AI Technical Summary

Problems solved by technology

However, special dynamometers are required and the price is relatively high; for turning processing, the main body of the dynamometer is suspended outside the tool holder or turret, which reduces the rigidity of the tool system and is prone to chatter, which will have an adverse effect on processing. At the same time, the cutting force data where chatter occurs is not easy to identify

In addition, the cutting force obtained by cutting the tool system with reduced stiffness is larger than the actual value

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