Multi-scale wavelet antivibration design method of high-speed main shaft of machine tool

Abstract

The invention relates to a multi-scale wavelet antivibration design method of a high-speed main shaft of a machine tool, which comprises the steps of: 1. by using interval cubic Hermite spline wavelets as the multi-scale interpolation basis, establishing a multi-scale wavelet numerical value solving model influenced by comprehensive gyroscopic couple, transverse shear deformation, main shaft rotary inertia, material delay and viscous damping, bearing cross rigidity and cross damping; and 2. carrying out the dynamic characteristic analysis on the high-speed main shaft of the machine tool by using the computation model established in step 1 to obtain a rotation speed range during smooth running and designing the running speed of the main shaft of the machine tool. The experimental result indicates that the invention can greatly enhance the precision of the analysis on the critical eddy speed and the half-speed eddy speed of the emulated high-speed main shaft of the computer, and avoids the resonance region and the unstable region for carrying out the antivibration design of the main shaft rotation speed of the high-speed machine tool according to the acquired dynamic characteristic data , thereby ensuring the machining quality. The invention has the advantages of high design efficiency and low cost.

Description

technical field [0001] The invention belongs to the field of dynamic analysis and dynamic design of machine tool structures, and in particular relates to a multi-scale wavelet anti-vibration design method for a high-speed spindle of a machine tool. Background technique [0002] High speed is the eternal theme of machine tool design and manufacture, and the key components of the machine tool——the dynamic performance of the spindle, such as modal parameters and stability, are its most critical indicators. At present, the spindle speed of machining centers is generally (20000-32000) r / min, the spindle speed of gear machine tools has also been increased to (9000-12000) r / min, and the ultra-high-speed grinding center has reached 150,000 r / min. This constantly poses new challenges to the design and manufacture of machine tool manufacturers and scientific research institutions, and urgently requires people to conduct quantitative description and analysis of the design process throu...

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Problems solved by technology

[0004] Wavelet numerical solution is a newly developed numerical analysis method. Using the multi-resolution characteristics of wavelet, a variety of basis functions for structural analysis can be obtained. According to the accuracy requirements of solving problems, different basis functions are used. However, how to implement High-efficiency multi-scale wavelet numerical solution to analyze the dynamic characteristics of the high-speed spindle of the machine tool to obtain a smooth running speed range, thereby reducing vibration and ensuring the processing quality of the machine tool has not yet been reported

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