A Quantitative Analysis Method of Temperature Field and Thermal Deformation of CNC Machine Tools

Abstract

The invention discloses a method for quantitatively analyzing the temperature field and thermal deformation of a CNC machine tool tool, comprising the following steps: (1) performing theoretical calculation and analysis on the temperature field and thermal deformation of a CNC machine tool tool to obtain the theoretical temperature field and theoretical thermal deformation distribution of the tool temperature ;(2) Use temperature sensors to measure the temperature of 7 points on different surfaces of the tool; (3) Use laser displacement sensors to measure the thermal deformation in the three directions of x, y, and z during the cutting process of the tool; (4) Through actual measurement The temperature value on the surface of the tool and the thermal deformation in the three directions of x, y, and z are used to verify and reverse the actual boundary conditions of the tool heat conduction; at the same time, the theoretical calculation model is modified; (5) the tool model obtained in step (4) and the boundary (6) Accurate temperature field distribution and corresponding thermal deformation of CNC machine tools are obtained. The method of the invention is an effective quantitative analysis method for the thermal deformation of the tool, which reduces the thermal error of the machine tool and provides an effective method for improving the precision of the machine tool.

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...

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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.

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