A dynamic test device for machine tool spindle under cutting state of CNC machine tool

Abstract

The invention discloses a testing device of tool spindle dynamics of a numerically-controlled machine tool in a cutting state and belongs to the mechanical vibration and testing field. The testing device of the tool spindle dynamics of the numerically-controlled machine tool in the cutting state comprises the numerically-controlled machine tool, a signal collecting system and an analyzing system. According to the testing device of the tool spindle dynamics of the numerically-controlled machine tool in the cutting state, actual vibration of a machine tool spindle cutting tool is measured through an electrical vortex sensor, an axel center track of the machine tool spindle is drew, cutting stimulus signals the cutting tool actually bear are measured through a cutting force tester, and the test and the analysis of dynamic characteristics of the cutting tool in the actual cutting state are achieved in combination with the measured actual vibration of the cutting tool. The testing device of the tool spindle dynamics of the numerically-controlled machine tool in the cutting state has the advantages of solving the problem that the stability of the machine tool system in the actual cutting state cannot be measured and achieving real-time measure of the numerically-controlled machine tool in the actual cutting state.

Description

technical field [0001] The invention belongs to the field of mechanical vibration and testing, and in particular relates to a dynamic testing device for a machine tool spindle under the cutting state of a numerically controlled machine tool. Background technique [0002] With the rapid development of science and technology, high-performance CNC machine tools continue to develop towards high speed, high precision and high efficiency, and the performance requirements for high-speed spindles are also increasing, especially in the field of high-speed machining, the dynamic characteristics of high-speed spindle processing Has become the core technology of high-speed machining. [0003] In the actual machining process, the dynamic characteristics of the machine tool spindle unit will directly affect the machining accuracy and efficiency. Through the study of the dynamic characteristics of the machine tool spindle, we can find out the weak link of the machine tool structure, and p...

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Problems solved by technology

[0004] At present, most of the domestic tests on the dynamic characteristics of the machine tool spindle are carried out in the static state of the machine tool spindle, that is, it is assumed that the dynamic parameters of the machine tool spindle at rest are the same as the actual cutting power parameters of the machine tool spindle, which is obviously more and more unsuitable for high-speed spindles. development needs

In addition, due to the lack of experimental verification of the dynamic characteristics of the machine tool spindle under high-speed operation obtained through numerical analysis, the analysis results obtained are not convincing

The correctness of the numerical analysis depends on the accuracy of the model and boundary conditions, but it is often difficult to accurately model the characteristics of the sliding bearing, hydrostatic bearing and the joint surface between the various parts of the machine tool, so the final analysis results will be very different. big error

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