For the precision parts processing industry, sufficient accuracy is usually a relatively intuitive reflection of its workshop processing strength. We know that temperature is the main factor affecting the machining accuracy.
In the inherent processing process, under the action of various heat sources (conflict heat, cutting heat, ambient temperature, thermal radiation, etc.), when the temperature of the machine tool, tool and workpiece changes, thermal deformation will occur. It will affect the relative displacement between the workpiece and the tool, form the machining deviation, and then affect the machining accuracy of the part. For example, when the linear expansion coefficient of steel is 0.000012, the elongation of steel parts with a length of 100 mm will be 1.2 um for every 1℃ increase in temperature. The change of temperature not only directly affects the expansion of the workpiece, but also affects the accuracy of the machine tool equipment.
In precision machining, higher requirements are put forward for the accuracy and stability of the workpiece. According to the statistics of relevant materials, the machining deviation caused by thermal deformation accounts for 40% - 70% of the total machining deviation of precision machining. Therefore, in order to prevent the expansion and contraction of the workpiece caused by temperature change, the reference temperature of the construction environment is usually strictly controlled. Draw the deviation boundary of temperature transformation, 200.1 and 200.0 respectively. The thermostatic treatment is still carried out at 1℃.
In addition, precision temperature control technology can also be used to accurately control the thermal deformation of parts to improve the precision machining accuracy. For example, if the temperature change of the reference gear of the gear grinder is controlled within ± 0.5 ℃, the gapless transmission can be realized and the transmission error can be eliminated; When the temperature of the screw rod is adjusted with the accuracy of 0.1 ℃, the pitch error of the screw rod can be controlled with the accuracy of micrometer. Obviously, precision temperature control can help machining achieve high-precision machining that cannot be achieved by mechanical, electrical, hydraulic and other technologies alone.
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Post time: Mar-14-2023