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Effect of Temperature on machining of Precision Parts

2019/8/7 13:29:08 Viewers:

As far as our precision machine parts machining industry, adequate accuracy is often a relatively intuitive reflection of the processing strength of its workshop. We know that temperature is a major factor affecting the processing accuracy. Here is a brief introduction from Xiaobian.

Under the action of various heat sources (conflict heat, cutting heat, ambient temperature, thermal radiation, etc.) in the process of intrinsic machining, thermal deformation will occur when the temperature of machine tool, tool and workpiece being processed changes, thus affecting the relative displacement between workpiece and tool, forming processing deviation, and then affecting the processing accuracy of parts. For example, when the linear expansion coefficient of steel is 0.000012 /, the elongation of steel parts with length of 100mm will be 1.2um when the temperature rises by 1C. Temperature transformation not only directly affects the expansion of workpiece, but also affects the accuracy of machine tool equipment.

In precision machining, higher requirements are put forward for the accuracy and stability of the workpiece. According to the statistics of related materials, the processing deviation caused by thermal deformation accounts for 40%-70% of the total processing deviation in precision machining. Therefore, in order to prevent the expansion and contraction of the workpiece due to the temperature transformation, the reference temperature of the constitutional environment is usually strictly controlled. The deviation boundaries of the temperature transformation are drawn up, which are 20 +0.1 and 20 +0.0.0. Constant temperature processing at 1 C still occurs.

Normally, for the constant temperature and humidity laboratory for precision processing, in order to prevent the workpiece from expanding and shrinking due to the temperature change during processing and measurement, the standard temperature in the laboratory is usually strictly regulated, and the deviation boundaries of temperature change are drawn up. However, the requirement of relative humidity of air has no requirement for the accuracy of textile testing. Strict. For a national ultra-precision processing laboratory, the required temperature is 20 +0.2, while the relative humidity is 45%+5%.

In the future, with the development of society and the progress of technology, the technology of temperature control for precision parts processing will be more and more developed.