Trajectory regeneration compensation method of numerical control machine error

Abstract

The invention discloses a trajectory regeneration compensation method of numerical control machine error. The method comprises the steps that: at first, a temperature sensor is arranged on a numerical control machine to measure geometrical error and thermal error of the machine, and then a machine error model is established; second, an error compensation controller diverges a numerical control trajectory to be processed and reads data from the temperature sensor; afterwards, the error compensation controller substitutes a node coordinate subsequent to divergence and temperature data in the machine error model to obtain an error to which the coordinate is corresponding, the error is then superposed on the coordinate of the node, and the numerical trajectory is reconstructed according to the corrected coordinate; and finally, the error compensation controller transfers the reconstructed trajectory to numerical control system for being processed, so as to realize the compensation for numerical control machine error. Compared with other compensation methods, the method according to the invention has the advantages of great flexibility and convenience, strong adaptability and no need of changing numerical control system, etc.

Description

technical field [0001] The invention relates to a numerical control machine tool error compensation method, in particular to a numerical control machine tool error track regeneration compensation method compensated by an external compensation controller. Background technique [0002] The machining accuracy of CNC machine tools is an important index to measure the working performance of CNC machine tools. Among the machining accuracy affecting machine tools, geometric errors and thermal errors account for the largest proportion of errors. Geometric error is the error caused by the deformation of the overall structure of the machine tool. For large CNC machine tools, the weight of the components and the process of assembly may cause large deformation of the structure. A large number of studies have shown that thermal error is the largest error source of precision machining machinery such as CNC machine tools, accounting for about 70% of the total error, and for ultra-precision...

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Problems solved by technology

The advantage of this method is that all errors can be compensated within a rough interpolation cycle, and the compensation accuracy is high, but there are the following problems in practical applications: there are few CNC manufacturers that provide complete error compensation interfaces, because the overall error of the machine tool is a Spatial error, its calculation and processing are more complicated, and will consume a lot of computing resources

The disadvantage of this method is that the compensation error is limited. Since the trajectory of several sections to be processed is offset as a whole, the effectiveness of the error compensation is based on the same thermal error everywhere on the contour.

At this time, if the difference in thermal error at both ends of the track is relatively large, the final compensation effect will be poor, and in some cases it is not as good as the effect without compensation.

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