How to reduce the machining error of the CNC lathe? To improve the machining accuracy of the CNC lathe, the error compensation method and error prevention method can be used.

Error compensation method

The error compensation method is a method to use the compensation function of the CNC lathe system to compensate for the existing errors of the lathe coordinate axis, to improve the accuracy of the CNC lathe. Through error compensation technology, high-precision parts can be machined with low accuracy on a CNC lathe. The realization of error compensation can be achieved through hardware or software.

This programming method can realize the interpolation processing of the CNC lathe when the mechanical parts remain unchanged and the low-speed unidirectional positioning reaches the interpolation starting point. In the interpolation process, when the feed is reversed, the formal interpolation of the gap value can meet the tolerance requirements of the parts. Other types of CNC lathes can provide multiple addresses in the memory of CNC equipment to be used as a dedicated storage unit to store the reverse clearance value of each axis. When the axis of the CNC lathe is instructed to change the direction of motion, the numerical control device of the CNC Lathe will read the reverse clearance value of the axis from time to time, compensate and correct the coordinate displacement command value, and accurately position the lathe at the specified position according to the requirements, to eliminate or reduce the impact of the reverse deviation on the machining accuracy of parts.

For a CNC lathe with a semi-closed loop servo system, the positioning accuracy and repeated positioning accuracy of the lathe are affected by the reverse deviation, which further affects the machining accuracy of machined parts. For the error, in this case, the compensation method can be used to compensate for the reverse deviation and reduce the accuracy error of the machined parts. Nowadays, the positioning accuracy of many CNC lathes in China's machining industry is more than 0.02mm. This kind of lathe generally has no compensation function. In some cases, the programming method can be used to realize its unit positioning and clear the reverse gap.

Other methods

For the machining accuracy error caused by the geometric parameters of the turning tool, the following methods can be adopted: during the programming process, make the trajectory of the tooltip consistent with the machining contour of the part and the ideal contour, that is, before programming, convert the actual arc-shaped tool tip trajectory into the trajectory of the imaginary tool tip through artificial calculation, and try to achieve zero error in theory.

At the same time, it is also extremely important to take the center of the tooltip arc as the tool location in the programming process, because the drawing of the center track of the tooltip arc and the calculation of its feature points are cumbersome in this process, and a slight error will cause great errors. To avoid and reduce the occurrence of this error, this operation can be completed by using the drawing function of the isometric line in CAD software and the coordinate query function of the point. However, when machining with this method, pay attention to check whether the value of the tooltip arc radius of the tool used is consistent with the value in the program, and take the value into account when setting the tool.

Make a purchase of low cost cnc lathe, optimum cnc lathe, smart cnc lathe from China, you can get them at a good price if you have a large quantity. We hope to be your long-term partner.