At present, the key task of CNC machine tools companies in China is to speed up the transformation of economic development methods, to master the core technologies of several high-end numerical control systems and key functional components, and to continuously improve the capabilities of enterprises in technological innovation. The same machine tool, due to the different standards used, the resulting position accuracy is not the same, so when selecting the accuracy index of CNC machine tools, we must pay attention to the standards it adopted. At present, the accuracy test of CNC machine tools usually adopts the international standard ISO 230-2 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 has integrated the information for everyone, and share tips for improving the progress of CNC machine tools.
Reverse deviation on the CNC machine tool, due to the counter-dead zones of the drive components (such as servo motors, servo-hydraulic motors and stepping motors, etc.) on the feed chains of the coordinate axes, and the backlash of the mechanical drive transmission pairs. The existence of this causes the axes to form a reverse deviation when they move from a forward motion to a reverse motion, which is also often referred to as a backlash or inactivation. For CNC machine tools using a semi-closed-loop servo system, the existence of reverse deviation will affect the positioning accuracy and repeatability of the machine tool, which will affect the machining accuracy of the product. If the G01 cutting movement, reverse deviation will affect the accuracy of the interpolation movement, if the deviation is too large will cause the circle is not round enough, not square; In the G00 rapid positioning movement, reverse deviation affects the positioning of the machine Accuracy makes the positional accuracy between holes smaller when drilling holes, boring holes, etc. At the same time, with the increase of the equipment operation time, the reverse deviation will increase with the gradual increase of the wearer's clearance due to wear. Therefore, it is necessary to periodically measure and compensate the reverse deviation of each coordinate axis of the machine tool.
Positioning Accuracy The positioning accuracy of CNC machine tools refers to the position accuracy of the measured moving parts of the machine tool under the control of the CNC system. It is an important precision of CNC machine tools that is different from ordinary machine tools. It is in common with the geometric accuracy of machine tools. The machine tool's cutting accuracy has an important influence, and it has a decisive influence on the pitch error in the hole machining. A CNC machine tool can judge its machining accuracy from the positioning accuracy it can achieve. Therefore, the detection and compensation of the positioning accuracy of CNC machine tools is a necessary way to ensure the processing quality.
The reverse bias and positioning accuracy of CNC machine tools are very important for the accuracy of the machine tool. The above two points of information are expected to help everyone and apply the theory to practice.
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