For our precision machinery parts processing industry, sufficient precision is often the most intuitive way to reflect the processing capabilities of its factories. We are specialized in manufacturing non-standard metal parts. Our precision can reach 0.01mm, we know that temperature is the impact of processing A major element of accuracy
In the actual machining process, under the action of various heat sources (friction heat, cutting heat, ambient temperature, heat radiation, etc.), the machine tool, the tool, the workpiece being processed and other temperature changes will produce thermal deformation, which will affect the workpiece and the tool. The relative displacement between the two causes machining errors and affects the machining accuracy of the parts. For example, the coefficient of linear expansion of steel is 0.000012/°C. For a steel piece having a length of 100 mm, when the temperature rises by 1°C, the elongation will be 1.2 μm. In addition to directly affecting the expansion and contraction of the workpiece, temperature changes also affect the accuracy of the machine tool equipment.
In precision machining, higher requirements are placed on the accuracy and accuracy of the workpiece. According to statistics, the processing error caused by thermal deformation in precision machining accounts for 40%-70% of the total machining error. Therefore, in high-precision precision machining, in order to avoid the workpiece due to temperature changes caused by the expansion and contraction, generally strictly set the reference temperature of the environment. And the deviation range of the temperature change has been formulated. Constant temperature machining of 20°C±0.1°C and 20±0.01°C has emerged.
Under normal circumstances, for the constant temperature and humidity laboratory for precision machining, in order to avoid the expansion and contraction of the workpiece during processing and metering due to temperature changes, the indoor reference temperature is generally stipulated, and the deviation range of the temperature variation is defined. The relative humidity of the air is such that there is no strict requirement for the accuracy of textile testing. For example, a national-level 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 advancement of technology, the temperature control process of precision parts processing will become more and more developed