Do you think it is difficult to achieve a machining torelance of 1 μm?

People engaged in machining are unwilling to admit defeat when it comes to precision. Sometimes, some people seem to regard a machining accuracy of 1 micron as a piece of cake when they brag. However, in fact, high-precision machining is a technical topic that needs to be treated rigorously. This article aims to provide a comprehensive popular science on the common sense of high-precision machining.

01. The influence of temperature changes on materials

As we all know, materials are affected by thermal expansion and contraction. In precision machining, temperature issues must not be ignored! Temperature differences are the nemesis of precision. If we do not pay attention to the key issue of temperature, how can we discuss precision in depth? Since most of the components of the machine are made of steel and cast iron, they will change in shape and length under the influence of room temperature and the heat generated by the machine itself.

02 Temperature causes detection errors

For factories without experience in precision machining, when performing precision machining, they often attribute unstable precision to the accuracy of the equipment. On the contrary, factories with experience in precision machining know that this is the most basic understanding. They understand that the thermal balance of ambient temperature and machine tools is essential to maintaining stable machining accuracy. These experienced factories clearly understand that even with high-precision machine tools, stable machining accuracy can only be achieved by maintaining a stable temperature environment and thermal balance.

Generally speaking, if the machined parts are more precise but not accurate, it may be because the workshop temperature fluctuates within a small range, but there is a large deviation from the standard temperature. Therefore, the resulting part size is more consistent, but there is a large deviation from the target size; on the contrary, if the part is more accurate but not precise, it may be because the workshop temperature has obvious ups and downs relative to the standard temperature, resulting in a discrete distribution of part sizes; and if the part is neither precise nor accurate, this may indicate that the workshop temperature deviates greatly from the standard temperature and the fluctuation range is large.