Abstract
The present study shows how to improve the working accuracy of numerically controlled lathe by predicting and compensating the thermal expansion of tool during machining, which is known to affect much on the machining accuracy. The method is based on to correct the numerical control commands corresponding to the thermal expansion of tool in advance of operation. The amount of the thermal expansion can be accurately calculated by the program developed, in which the amount of heat generation is represented as a function of cutting condition. When the program judges that the expansion of tool exceeds a certain value, new numerical control commands are generated with the position of tool compensated in the direction of cut. The cutting tests by a lathe with this compensation have shown to improve the machining accuracy considerably.
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