A unified method for toolpath generation in wide-row end milling

Abstract

A unified method for generating a wide line end milling tool rail comprises the following steps that first, a concave area or a convex area on a parametric surface is selected; second, the tool rail is scattered into tool location points, and the yaw angles of the tool location points are determined; third, a mid-pointed method is used for optimizing each tool location to obtain the pitch angle, the tool lifting amount, the yaw angle and the line width of each tool location; fourth, the pitch angles of the tool rail in the third step are fitted by using the least square method to get the maximum deviation of a fitted curve and an original curve, the fitted curve is deviated upwards to obtain the deviation value, and an initial pitch angle is obtained by interpolation; fifth, the corresponding pitch angle range is obtained when the line width obtained in each tool location is a certain fixed value; sixth, the relation of the initial pitch angle determined in the fourth step and the pitch angle range determined in the fifth step is judged, and therefore the pitch angle and the tool lifting amount which meet the demands for the smoothness of the tool rail and the evenness of the line width at the same time are obtained; seventh, whether the machining line width covers the effective line width of the entire line of the tool rail under the tool posture obtained in the sixth step is judged, and if not, the pitch angle and the tool lifting amount are corrected.

Description

technical field [0001] The invention provides a unified method for generating tool tracks in wide-row end milling, which relates to a tool track generation algorithm in wide-row CNC machining, and in particular to a tool track generation algorithm for realizing uniform cutting width and smooth and uniform tool tracks . It belongs to the technical field of metal cutting processing. Background technique [0002] In the field of complex surface machining, five-axis machining has two more degrees of freedom than three-axis machining, and the flexibility of the machine tool is greatly improved. Through tool position optimization, the best fit between the tool and the curved surface can be achieved, thereby maximizing the processing line width. In wide row machining, the row width of some tool positions is too wide, which will make the material removal rate fluctuate violently, which may cause damage to the surface quality of the part, such as grinding burns. In addition, if the...

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Problems solved by technology

In addition, the double-end point trace driving method and the double tangent point trace driving method proposed by Xu Rufeng et al. can keep the processing width of each row of tool paths consistent, and realize the arrangement of equal residual height tool paths, but the smoothness of the tool paths cannot be achieved. good guarantee

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