Spindle thermal distortion compensation method for precision horizontal machining center

Abstract

A spindle thermal distortion compensation method for a precision horizontal machining center comprises the steps as follows: a spindle model of a machine tool is simplified structurally; an ANSYS (finite element analysis software)-Workbench is utilized to perform mesh generation on a spindle entity model that is simplified, so as to obtain a spindle finite element model; and boundary conditions are calculated by combining with the practical spindle rotational speed, the environmental temperature, the coolant velocity, the flow rate, the inlet and outlet oil temperature and the like, and configuration is performed. Thermodynamics analysis and statics analysis are carried out in the ANSYS-Workbench to obtain more accurate spindle temperature field distribution and thermal deformation. Based on a finite element emulation result, the spindle temperatures in different positions and the spindle thermal deformations are analyzed at different rotational speeds by utilizing the Spearman rank correlation analysis, and spindle thermal key points are found out, so that references are provided to spindle thermal error tests and thermal error compensation. Finally, a thermal error compensation model is built up by utilizing a least squares method according to the key point temperature of the spindle and the thermal errors in the practical tests. Based on the thermal error compensation model, the spindle thermal error compensation is carried out by combining with thermal error compensation strategies of a numerical control system of the machine tool.

Description

technical field [0001] The invention belongs to the processing process of a precision horizontal machining center, and in particular relates to a method for compensating thermal error of a spindle of a precision horizontal machining center, including a temperature field of a spindle system and a thermal deformation finite element simulation calculation method, a method for selecting thermal key points, thermal error testing and construction modeling methods, and thermal error compensation implementation methods. Background technique [0002] As the key component of the machine tool, the performance of the spindle directly affects the machining accuracy, stability and application range of the machine tool. In recent years, high-speed spindles have become a development trend of spindles. However, the internal bearings of the spindle will generate a lot of heat under high-speed rotation, which will cause deformation of the spindle and affect the machining accuracy. At present,...

AI Technical Summary

Problems solved by technology

The above two methods can realize thermal error compensation and greatly reduce thermal error, but they need to add compensation hardware devices outside the system, and professional software programming is required, which not only increases the complexity of the system, but also increases the cost

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