Composite cutter path generation method based on discrete cutter location point

Abstract

The invention provides a composite cutter path generation method based on a discrete cutter location point. A composite cutter path is a cutter patch which comprises multiple interpolation modes such as a line, an arc, a spline curve and the like and optimization combinations thereof. The combination form changes with the shape characteristics of a processed workpiece and a processing trajectory. According to the invention, for cutter location point information on an already known processing trajectory, the composite cutter path formed by reasonable combination of the three interpolation modes as the line, the arc and the B spline curve is studied through such means as interpolation priority arrangement, error analysis, optimization segmentation, fitting calculation and the like, under the condition that allowed processing errors are satisfied, smoothing processing on the cutter path is realized, at the same time, a numerical control program is simplified, and the processing quality and efficiency are improved.

Description

technical field [0001] The invention relates to the field of curve processing, in particular to a compound tool path generation technology. Background technique [0002] In the fields of automobiles and aviation, some special transition curves and surfaces that play a role in aesthetic decoration or rigidity enhancement are often involved, which are usually also called free curve surfaces. [0003] The processing of free curves and surfaces is mainly completed by CNC milling. The quality of tool path design directly affects the surface processing quality of curves and surfaces. [0004] The tool path design of the free curve surface is usually realized by using CAM (Computer Aided Manufacturing, computer-aided manufacturing) software. In the process of tool path design for free curved surfaces, the CAM software system first calculates the tool contacts on the machined surface according to the processing conditions, and then converts them into corresponding tool points accor...

AI Technical Summary

Problems solved by technology

The tool path generated by this linear interpolation method is a broken line tool path. This kind of broken line tool path often has some shortcomings in high-performance NC machining of free curves and surfaces. For example, the existence of a large number of tool points leads to a large amount of code programs. The tool path itself does not have continuity, which makes the machined surface not smooth, and at the same time causes problems such as unstable cutting motion, decreased actual cutting speed and prolonged cutting time

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