Quantitative analyzing method for temperature fields and thermal deformations of cutter of numerical control machine tool

Abstract

The invention discloses a quantitative analyzing method for temperature fields and thermal deformations of a cutter of a numerical control machine tool. The quantitative analyzing method comprises the following steps of: (1) theoretically computing and analyzing the temperature fields and the thermal deformations of the cutter of the numerical control machine tool to obtain a distribution of theoretical temperature fields and theoretical thermal deformations of the cutter; (2) measuring temperatures of 7 points on different faces of the cutter by using a temperature sensor; (3) measuring thermal deformations of the cutter in an x direction, a y direction and a z direction during the cutting process by using a laser displacement sensor; (4) verifying and reverse solving actual boundary conditions for thermal conduction of the cutter according to an actually measured temperature value on a cutter face and the thermal deformations in the x direction, the y direction and the z direction, and modifying a theoretical computation module; (5) reloading the obtained cutter module and boundary conditions; and (6) obtaining an accurate distribution of the temperature fields and corresponding thermal deformations of the cutter of the numerical control machine tool. The quantitative analyzing method disclosed by the invention is an effective quantitative analyzing method for the thermal deformations of the cutter, and can be used for reducing a thermal error of a machine tool and increasing accuracy of the same.

Description

Technical field: [0001] The invention belongs to the field of measurement, and relates to a numerically controlled machine tool tool temperature field and thermal deformation quantitative analysis method, in particular to a mathematical model-based numerically controlled machine tool tool temperature field and thermal deformation quantitative analysis method. Background technique: [0002] Thermal error is the relative displacement between the workpiece and tool due to deformation or expansion of machine tool components due to increased machine temperature. The relative movement between the different parts of the machine tool generates a large amount of heat in the contact area of ​​the parts, and it is this heat that causes the deformation of the machine tool parts. Thermal error accounts for 40% to 70% of the overall error of the machine tool. How to reduce the thermal deformation error of machine tools has become the focus of the world's manufacturing industry. Due to t...

AI Technical Summary

Problems solved by technology

[0003] The tool will generate a lot of heat during the cutting process, which will increase the temperature of the tool and cause a large amount of deformation to cause cutting errors. However, domestic research on thermal deformation of tools has been in a qualitative research state.

With the engineering practice in recent years, it has been proved that the thermal deformation of the tool has become an important error source in high-precision machining, and it seriously hinders high-speed and high-precision machining.

In the factory, in order to reduce the machining error caused by the heating of the tool, various cooling methods are adopted to reduce the temperature of the tool, but the thermal deformation cannot be eliminated from the root.

Images