How to correct these errors in the machining center and improve accuracy

1、 The error synthesis method to eliminate errors in the machine tool itself is the most important way to ensure the final machining accuracy of the workpiece. The error synthesis method requires measuring the original errors of each axis of the machine tool. Laser interferometer is the primary detection instrument in machining centers due to its high measurement accuracy and flexible application.

2、 Error compensation method refers to artificially creating an error to offset the inherent original error in the process system, or using one original error to offset another original error, in order to achieve the intention of improving the machining accuracy of the workpiece. Generally, by reducing the gap of the machine tool, improving the stiffness of the machine tool, and selecting preloads to generate preload in the relevant cooperation, the influence of the gap is eliminated. It is also possible to improve the stiffness of the workpiece and tool, reduce the overhang length of the tool and workpiece, and improve the stiffness of the process system. Reasonable clamping and processing methods can also be selected to reduce cutting force and its changes, select tool data reasonably, increase rake angle and main deviation angle, and perform reasonable heat treatment on workpiece data to improve the processing performance of the data.

3、 The direct reduction of original errors method refers to the method of directly eliminating or reducing the primary original error elements that affect machining accuracy after identifying them. For example, after long-term use, the positioning of the transmission system may be misaligned due to natural wear, resulting in reverse gaps, etc.

4、 The error uniformity method is the use of closely related surfaces to compare and correct each other, or to use each other as a benchmark for processing, in order to achieve the intention of eliminating processing errors.

5、 The essence of error transfer method is the inductive error caused by the adjustment error, stress deformation, and thermal deformation of the transfer process system. If the machining center performs some hole processing, the coaxiality of the workpiece is not ensured by the rotation accuracy of the machine tool spindle, but by the fixture. When the machine tool spindle and the workpiece are selected for floating connection, the original errors of the machine tool spindle will no longer affect the machining accuracy, but will be transferred to the fixture to ensure the machining accuracy.

6、 The error grouping method in processing results in processing errors in this process due to the presence of rough errors in the process. The change in blank errors has two main impacts on this process: reaction errors and positioning errors.

It is based on the workpiece design drawing to develop the process program as a plan, and uses the computer to automatically compile the part processing program to convert the processing process parameters required by the workpiece into the information that can be recognized by the NC device of the machine tool. Command and control, the machine has strong adaptability and good flexibility to the processing of parts. It uses three-dimensional variable diameter structure design, and through finite element analysis, the machine body structure is optimized to a greater extent to ensure the stability and reliability of the machine body, It can also prevent deformation of the machine body, greatly improving the service life of the machine tool.