"Machine Tool Knowledge" : The Influence of Temperature on Machine Tool Machining Accuracy and Countermeasures

Thermal deformation is one of the main reasons affecting the machining accuracy of machine tools. The machine tool is affected by the changes in the workshop environment temperature, the heat generated by the motor and the friction of mechanical movement, the cutting heat and the cooling medium, resulting in uneven temperature rise in various parts of the machine tool, which leads to changes in the shape accuracy and processing accuracy of the machine tool. For instance, when processing a screw on a CNC milling machine with ordinary precision, the cumulative error of the workpiece milled from 7:30 to 9:00 in the morning can change by as much as 0.05mm compared to that processed from 2:00 to 3:30 in the afternoon. For instance, a grinding machine, after continuous automatic grinding for one hour, saw the dimensional variation range increase to 0.012mm, and the coolant temperature rise from 17℃ at startup to 45℃. These examples all reflect a fact: the machining accuracy of machine tools is directly affected by thermal deformation caused by temperature changes. Thermal deformation is one of the main reasons affecting the machining accuracy of machine tools. The machine tool is affected by the changes in the workshop environment temperature, the heat generated by the motor and the friction of mechanical movement, the cutting heat and the cooling medium, resulting in uneven temperature rise in various parts of the machine tool, which leads to changes in the shape accuracy and processing accuracy of the machine tool. For instance, when processing a screw on a CNC milling machine with ordinary precision, the cumulative error of the workpiece milled from 7:30 to 9:00 in the morning can change by as much as 0.05mm compared to that processed from 2:00 to 3:30 in the afternoon. For instance, a grinding machine, after continuous automatic grinding for one hour, saw the dimensional variation range increase to 0.012mm, and the coolant temperature rise from 17℃ at startup to 45℃. These examples all reflect a fact: the machining accuracy of machine tools is directly affected by thermal deformation caused by temperature changes.