Two tips to easily determine the accuracy of CNC machine tools

At this stage, the key tasks of China's CNC machine tool enterprises are to accelerate the transformation of economic development mode, vigorously implement technological innovation, promote product structure adjustment, accelerate research and development, master several core technologies of high-end CNC systems and key functional components, and in technological innovation. Continuously improve the capabilities of the company. Note: This article is from [China Machine Tool Business Network]


At this stage, the key task of China's CNC machine tool enterprises is to accelerate the transformation of economic development mode, vigorously implement technological innovation, promote product structure adjustment, accelerate research and development, master several core technologies of high-end CNC systems and key functional components, in technology. Innovation constantly improves the capabilities of the company.



The same machine tool, because of the different standards used, the positional accuracy is not the same, so when choosing the accuracy index of CNC machine tools, also pay attention to the standards it uses. At present, the inspection of the positional accuracy of CNC machine tools usually adopts the international standard ISO230-2 or the national standard B10931-89.



The position standard of CNC machine tools usually refers to the reverse deviation and positioning accuracy of each CNC axis. The editor of China Machine Tool Business Network integrates the information for everyone, and share with you the tips for improving the progress of CNC machine tools.



Reverse deviation



On the numerical control machine tool, due to the error of the reverse dead zone of the drive components (such as servo motor, servo hydraulic motor and stepping motor) and the backlash of each mechanical motion transmission pair in each coordinate axis feed chain, Causes each coordinate axis to form a reverse deviation when it is converted from forward motion to reverse motion, and is also commonly referred to as backlash or loss. For CNC machine tools with semi-closed-loop servo system, the existence of reverse deviation will affect the positioning accuracy and repeat positioning accuracy of the machine tool, thus affecting the machining accuracy of the product. For example, in the G01 cutting motion, the reverse deviation will affect the accuracy of the interpolation motion. If the deviation is too large, the circle will not be round enough, and the square is not enough. In the G00 rapid positioning motion, the reverse deviation affects the positioning of the machine tool. Accuracy makes the positional accuracy between the holes in drilling, boring and the like reduced. At the same time, with the increase of equipment running time, the reverse deviation will increase with the increase of the movement auxiliary gap due to wear. Therefore, it is necessary to periodically measure and compensate the reverse deviation of the machine axes.



positioning accuracy



The positioning accuracy of CNC machine tools refers to the positional accuracy that can be achieved by the movement of the moving parts of the machine tool under the control of the numerical control system. It is an important precision of the CNC machine tool which is different from the ordinary machine tool. It is the same as the geometric precision of the machine tool. Accuracy has an important impact, especially on the pitch error in pore processing. A CNC machine tool can judge its machining accuracy from the positioning accuracy it can achieve. Therefore, detecting and compensating the positioning accuracy of CNC machine tools is the necessary way to ensure the processing quality.



The reverse deviation and positioning accuracy of CNC machine tools are very important for the accuracy of the machine tool. The above two points of information, I hope to help everyone, apply the theory to practice.



This document is provided by an excerpt from "Silver CNC".


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