Precision problem in nc lathe processing Influence of position error in NC lathe processing on machining accuracy: Position error refers to the variation or deviation degree between the actual surface, axis or symmetry plane of the processed parts and their ideal positions, such as verticality, position and symmetry. CNC machine tool processing position error usually refers to the dead zone error, the cause of position error is mainly in the machine tool parts processing due to the transmission of clearance and elastic deformation caused by the processing error, As well as in the processing, the tool head of the machine tool needs to overcome friction and other factors resulting in position error. In the open loop system, the position accuracy is greatly affected, while in the closed loop follow-up system, It mainly depends on the accuracy of displacement detection device and the speed amplification coefficient of the system.
Machining accuracy error caused by geometric error in NC lathe processing: CNC lathe processing, due to the tool and fixture in the process of external forces and heat generated by the influence of external factors, the lathe's geometric accuracy is affected, lathe processing parts produce geometric deformation, resulting in geometric error. According to research, CNC lathes produce geometric error of the main reasons are nothing more than the following two: internal factors and external factors. The internal factors of lathe geometric errors refer to the geometric errors caused by the factors of the machine tool itself, such as the levelness of the lathe table surface, the level and straightness of the lathe guide rail, the geometric accuracy of the lathe cutter and fixture, etc. External factors mainly refers to the geometric error generated under the influence of factors such as thermal deformation in the external environment and processing process, such as cutting tools or parts in the cutting process, due to thermal expansion, deformation, thereby producing geometric error, affecting the machining accuracy of the lathe and parts processing accuracy.
Machining accuracy error caused by lathe positioning in CNC lathe processing: Through long-term data analysis and practical operation of parts processing, lathe positioning has great influence on the machining accuracy of CNC lathe. CNC lathe machining error, from the structure, caused by the positioning accuracy, which lathe feed system is the main link to affect the positioning accuracy. The feed system of CNC lathe is usually composed of mechanical drive system and electrical control system. The positioning accuracy is related to the mechanical drive system in structural design. In closed loop systems, CNC lathes can usually prevent position deviations from major components of the feed system, such as ball screws, by positioning detection devices. For the open-loop system, due to more factors, the situation is more complex, can not be monitored positioning, so the machining accuracy of CNC lathe has a greater impact.
Machining accuracy error caused by lathe positioning in CNC lathe processing: Through long-term data analysis and practical operation of parts processing, lathe positioning has great influence on the machining accuracy of CNC lathe. Countermeasures to improve the machining accuracy of CNC lathe: By controlling the original error of CNC machine tools to improve the machining accuracy reasonable design of the core components of machine tools to avoid positioning error through real-time monitoring technology to improve the machining accuracy of CNC machine tools with the continuous improvement of CNC technology, real-time monitoring of the whole machining process of CNC lathe, timely adjustment of the error link in the processing process, And the error data of each link in the processing process is collected, and feedback to the control terminal, and through the error data to take the corresponding error compensation mechanism, timely error compensation, can effectively improve the machining accuracy of parts. CNC lathe machining error, from the structure, caused by the positioning accuracy, which lathe feed system is the main link to affect the positioning accuracy. The feed system of CNC lathe is usually composed of mechanical drive system and electrical control system. The positioning accuracy is related to the mechanical drive system in structural design. In closed loop systems, CNC lathes can usually prevent position deviations from major components of the feed system, such as ball screws, by positioning detection devices. For the open-loop system, due to more factors, the situation is more complex, can not be monitored positioning, so the machining accuracy of CNC lathe has a greater impact.
