Application Of Error Compensation In Improving Machining Accuracy | CNCLATHING

Mechanical production requires the participation of CNC machine tools. In the processing process, there is a perfect precision adjustment system. It is usually carried out according to the use requirements of parts, but it is more necessary to consider the hard standard of management and improve it through technical means. Accuracy of machined parts. The specific technical improvement mainly includes the following aspects. The first is the part temperature control in the processing stage. If the temperature exceeds the range of raw materials, it will deform due to overheating, thus reducing the accuracy of parts. Second, adjust the tool angle. Tools will be worn to varying degrees over a long period of time. The parts produced by the machine tool will also be affected by the specification and size. Regular inspection tools can avoid such problems. The vibration generated by the old machine tool during operation will also reduce the accuracy. If it cannot be recovered through commissioning, the infrastructure must be replaced. Finally, the error caused by the control system. It is necessary to evaluate the feedback parameters of the system and optimize the system through programming. Several common error compensation control methods are summarized below.

1. Error proofing method

After finding out the cause of the error, the CNC machine tool can be adjusted locally, the parts with serious wear can be replaced, and after adjustment, check whether the parameters return to the normal range. According to the error of processed products, judge the unreasonable phenomena in the NC system and solve them in time. Preventing errors can also save construction costs and avoid cost losses caused by secondary maintenance. The error prevention method reduces the temperature rise of the heat source, balances the temperature field and reduces the thermal deformation of the machine tool to a certain extent, but it is impossible to completely eliminate the error sources such as thermal deformation and geometric error. Error proofing method is the most basic means to ensure the machining accuracy of NC machine tools, but on the one hand, this method is mainly restricted by the accuracy of machining machine tools, on the other hand, the improvement of part quality leads to the expansion of machining cost, which limits the use of this method.

2. Prevention of dimensional error and geometric error

Once there is something wrong with the machine, the ratio between parts will be wrong. In the error repair technology, it is necessary to clarify the geometric characteristics of each structure and find out the places with relatively weak stress as the basis of error detection, which can save a lot of maintenance time. The maintenance of NC machine tools through geometric error adjustment technology can promote mechanical production and processing more efficient and stable. In order to prevent and reduce the geometric errors of various machine tool parts in the manufacturing and installation process, many countries have invested a lot of human and material resources, adopted improved processes and new materials, and developed high-precision spindle and guide rail. measures; Many scholars at home and abroad have studied the static and dynamic stiffness, anti vibration analysis and topology optimization of CNC machine tools such as bed, ram, column and worktable. The static and dynamic stiffness and temperature changes of screw and other mechanical parts largely determine the machining accuracy of the whole CNC machine tool and improve the machining accuracy of the whole machine tool.

3. Prevention of thermal deformation error

In order to prevent thermal deformation, the most important thing is to control the temperature of the machining process. The numerical control system judges whether there are potential safety hazards according to the temperature obtained by feedback, and makes automatic adjustment. The setting of the temperature circulation system is also important. When the temperature of the production link exceeds the standard, part of the heat can be taken away through the cold cycle to meet the production and use requirements. The process of thermal deformation error is: the heat of the heating element is transmitted to the surrounding environment through the contact surface or radiation, causing the element to deform and produce error. It has the characteristics of multivariable, large time delay, nonlinearity and strong coupling. The research on thermal deformation error is relatively late, mainly by reducing heat source, controlling heat transfer path and adopting thermal stability structure.