A new determination method of tool step for 5axis NC machining
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Abstract:
The peculiar nonlinear error in the 5axis NC machining is studied. An improved tool step determination method for the 5axis NC machining is proposed, in which the nonlinear error is compensated. Both the arcchord error and the nonlinear error are considered when computing the tool step, and the comprehensive error is taken as the function of the tool path parameter. Due to the difficulty of gaining the derivative of this function and the tool step according to the prescribed tolerance, the secant method is improved to guarantee the real solution locating in the converging range which is adopted to compute the tool step. The implementing example shows that the proposed method can compensate the nonlinear error effectively with meeting the prescribed tolerance. The exact tool step can be gotten efficiently with the improved secant method.
