⑴Reduce the original error. Improve the geometric accuracy of the machine tool used in parts processing, improve the accuracy of fixtures, measuring tools and tools themselves, control the process system force, heat deformation, tool wear, deformation caused by internal stress, measurement error are considered to directly reduce the original error. In order to improve the machining accuracy, it is necessary to analyze the original processing errors, and take different measures to solve the main original processing error according to different situations. The machining of the precision spare parts should be improved as much as possible to reduce the geometric accuracy, stiffness and control of the machining thermal deformation of the used precision machine tools.
⑵Error compensation method. For some original errors of the process system, the error compensation method can be adopted to control the influence on the machining error.
⒈ Error compensation method: this method is artificially created a new original error, so as to compensate or offset the original error inherent in the original process system, to reduce the processing error and improve the processing accuracy.
⒉ error offset method: the use of the original original error to cancel the part or all of the original original error or another original error.
(3) Original error of differentiation or homogenization. In order to improve the machining accuracy of a batch of parts, the method of dividing some original errors can be adopted. For the surface of the parts requiring high machining accuracy, the method of equalizing the original error can also be adopted gradually, in the process of continuous trial cutting.
⒊Differentiation original error (grouping) method: According to the law of error reflection, the size of the workpiece of the blank or the previous process is divided into n groups according to the size after measurement, and the size range of each workpiece is reduced to the original 1 / n. Then adjust the accurate position of the tool relative to the workpiece according to the error range of each group, so that the size dispersion range of each group workpiece is basically the same center, so as to greatly reduce the size dispersion range of the whole batch of workpiece.
⒋Homalize original error: this process is a process of narrowing and averaging the original error of the processed surface through processing. The principle of homogenization is to find out the differences between them through the surface comparison and inspection of closely related artifacts or tools, and then conduct correction processing or reference processing for each other.
⑷Transfer of the original error. The essence of this method is to transfer the original error from the error-sensitive direction to the error-non-sensitive direction. Transfer of the original error to the non-sensitive direction. The degree of various original errors reflected in the part machining errors is directly related to whether they are in the error-sensitive direction. If it tries to transfer it to the non-sensitive direction of processing error in the processing process, the processing accuracy can be greatly improved. Transfer the original error to other aspects that have no impact on the machining accuracy.
In machining, error is inevitable. Only with a detailed analysis of the causes of error, can we take corresponding preventive measures to reduce the processing error and improve the machining accuracy.
