(1) Backlash compensation
In the transmission system of CNC machine tools, the servo motor and screw are generally connected in three ways: direct connection, synchronous belt transmission and gear transmission. Gears, ball screws, nuts, etc. The existence of this backlash will cause the servo motor to idle and the workbench will not actually move when the machine tool table moves in reverse, or when the servo motor moves. but the measuring device does not detect the displacement. For CNC machine tools, backlash will affect the positioning accuracy and repetitive positioning accuracy of the machine tool, thereby affecting the accuracy of processed products. This requires the CNC system to provide a software backlash compensation function to compensate for machine tool backlash, reduce its impact on machine tool accuracy, and improve the accuracy of machined parts. Often, as the use life of CNC machine tools increases, the backlash gradually increases due to the wear of mechanical parts. Therefore, the backlash of each coordinate axis of the CNC machine tool should be measured and compensated regularly.
(2) Pitch compensation
The linear feed axis on CNC machine tools mainly uses ball screws as mechanical transmission components. The motor drives the movement of the ball screw and converts the rotational movement of the motor into the linear movement of the feed shaft. If there is no error between the pitches of the ball screw, the rotation angle of the ball screw is linearly related to the linear displacement of the corresponding feed axis. However, in practice, there are always errors in both the manufacturing process and assembly, and there is a pitch error with each pitch of the ball screw. The linear movement of the feed axis is also reflected in a certain error, which will reduce the machining precision of the machine tool. Most CNC systems provide a pitch error compensation function, which can compensate for the pitch error that occurs in CNC machine tools to reduce machine tool errors and improve the accuracy of the machine tool. ‘machining. In addition, after a long time use of a CNC machine tool, due to the different wear degrees of each ball screw pitch, the error between each pitch will further increase, resulting in a decrease in the machining precision of the machine tool. Through periodic calibration and error compensation of machine tools, the life of machine tools can be extended while maintaining precision.
Daguang focuses on providing solutions such as precision CNC machining services (3-axis, 4-axis, 5-axis machining), CNC milling, 3D printing and rapid prototyping services.
