Method for automatically compensating numerical control machining size error based on fractional order

Abstract

The invention discloses a method for automatically compensating a numerical control machining size error based on a fractional order. The method comprises the following steps of performing machining, and measuring the size of a machined workpiece to obtain actual machining size data; comparing expected size data with the actual size data to solve a size error, and analyzing the error to identify a system order; calculating the amount of error compensation to be applied before the machining of the next workpiece according to the system order and a size error generated during the machining of the previous workpiece by adopting an iterative learning control law; and correcting a numerical control machining program for the workpiece by using the amount of error compensation before the machining of the next workpiece, and performing numerical control machining on the next workpiece by adopting the corrected numerical control machining program. The size error is automatically compensated by programming and developing numerical control machining size error compensation processing software based on the steps. The size error of the machined workpiece is integrally reduced, the machining accuracy is improved, the qualified rate of the workpiece is remarkably increased, and the remarkable error compensation effect is achieved.

Description

technical field [0001] The invention relates to an error compensation method, in particular to an automatic compensation method for dimension errors of numerical control machining based on fractional order. Background technique [0002] Machining accuracy is one of the most important technical indicators of CNC machining. The main methods to improve machining accuracy are: error prevention method and error compensation method. The error prevention method is to eliminate or reduce possible error sources through design and manufacturing, and to meet the processing accuracy requirements by improving the manufacturing accuracy of machine tools. In many applications, the physical limitations of machine tool accuracy cannot be overcome by design and manufacturing alone. Moreover, after a certain accuracy is exceeded, the economic cost of trying to achieve higher accuracy by adjusting the structure of the machine tool is very high. The error compensation method is a software tech...

AI Technical Summary

Problems solved by technology

However, this method is only for a specific CNC machining environment. The model lacks flexibility and cannot cover all the factors that cause errors. Moreover, the detection is cumbersome, the calculation is large, and it is not easy to promote; the second is regular linear compensation. According to the processing technology and equipment conditions, Determine a compensation amount to be implemented after a certain processing time

Since the actual processed size error is nonlinear, this method cannot compensate the size error caused by accidental factors, and cannot effectively suppress the nonlinear factors that cause the size error.

It can be seen that there are imperfections in the existing error compensation technology, which affects its application in actual processing

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