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Influence of Temperature on Process in Precision Parts Processing
Time:2020-3-17 10:47:24  Views:1515
The impact of temperature on the process in the processing of precision parts For our precision machinery parts processing industry, sufficient accuracy is often the most intuitive reflection of the processing capabilities of its factories. We, Grace Precision Machinery, specialize in manufacturing non-standard metal parts, and our accuracy It can reach 0.01mm, and we know that temperature is a major factor affecting processing accuracy.
In the actual machining process, under the action of various heat sources (friction heat, cutting heat, ambient temperature, heat radiation, etc.), changes in the temperature of the machine tool, tool, and workpiece being processed will cause thermal deformation, which will affect the workpiece and the tool. The relative displacement between them causes machining errors, which in turn affects the machining accuracy of the part. For example, the linear expansion coefficient of steel is 0.00012 / ° C. For steel pieces with a length of 100mm, when the temperature rises by 1 ° C, it will stretch 1.2 μm. In addition to directly affecting the expansion and contraction of the workpiece, temperature changes also affect the accuracy of machine tools.
In precision machining, higher requirements are imposed on the machining accuracy and stability of the workpiece. According to relevant statistics, in precision machining, machining errors due to thermal deformation account for 40% -70% of the total machining errors. Therefore, in high-precision precision machining, in order to avoid the workpiece shrinking due to temperature changes, the reference temperature of the environment is generally strictly specified. The deviation range of temperature change has been established. Constant temperature machining at 20 ℃ ± 0.1 ℃ and 20 ± 0.01 ℃ has appeared.
In general, for the constant temperature and humidity laboratory for precision processing, in order to avoid the expansion and contraction of the workpiece due to temperature changes during processing and measurement, the reference temperature in the room is generally strictly specified, and the deviation range of the temperature change is established. The requirement of relative air humidity is not as strict as the accuracy of textile testing. For example, a national ultra-precision machining laboratory requires a temperature of 20 ° C ± 0.2 ° C and a relative humidity of 45% ± 5%.
In the future, with the development of society and technological progress, the temperature control technology for precision parts processing will become more and more developed!
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