A Tracking Method for Determining the Boundary of Local Interference Region in Free-form Surface Machining

Abstract

The invention discloses a tracing method for determining a local interference region boundary of free-form surface machining. Through analysis of principal curvatures of a free-form surface and an isometric offset surface, the local interference region boundary condition of the free-form surface machining is obtained. A tracing initial point of the local interference region boundary is obtained through combination of a surface discrete method and a dichotomy method. A rough point of the local interference region boundary is obtained through tracking along an osculating circle of the interference region boundary from the initial point. A precision point of the local interference region boundary is calculated through iteration by using a gradient method. Two tracing judgmental end conditions are obtained according to the condition that whether the local interference region boundary is enclosed on the surface. The tracing method for determining local interference region boundary of the free-form surface machining has the advantages that the tracing method is suitable for fast tracing and determining the interference region boundary of the complex free-form surface machining, a tool path track is regionally planned, a total length of the tool path track is reduced, and the surface machining efficiency is improved.

Description

technical field [0001] The invention relates to a tracking method, in particular to a tracking method for determining the boundary of a local interference area in free-form surface processing. Background technique [0002] In the prior art, five-axis linkage machining can greatly improve the machining accuracy and efficiency of free-form surfaces. However, due to the continuous change of the curvature of the surface and the improper selection of the machining tool size, local interference is easily generated. Tool path trajectory planning and machining tool size selection are extremely important. [0003] At present, there is a major problem in the research field of tool path trajectory planning technology for free-form surface machining: it is necessary to manually specify the size of the machining tool in advance, and most of them choose based on the experience of programmers. In order to avoid local interference, most of them use conservative tool sizes. Therefore, the t...

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Problems solved by technology

[0002] In the prior art, five-axis linkage machining can greatly improve the machining accuracy and efficiency of free-form surfaces. However, due to the continuous change of the curvature of the surface and the improper selection of the machining tool size, local interference is easily generated. Tool path trajectory planning and machining tool size selection are extremely important

[0003] At present, there is a major problem in the research field of tool path planning technology for free-form surface machining: it is necessary to manually specify the size of the machining tool in advance, and most of them choose based on the experience of programmers. In order to avoid local interference, most of them use conservative tool sizes

[0009] The method of determining the boundary of the local interference area in the pre-processing method includes the discrete method, which needs to calculate the principal curvature of each discrete point on the surface, and then compare it with the tool size. In order to improve the calculation accuracy of the interference area boundary, it is necessary to reduce the discrete distance and increase the discrete Therefore, the amount of calculation is large and the accuracy is not high, and it is difficult to meet the requirements of non-interference tool path trajectory planning for complex free-form surface processing. It is necessary to further develop a new method for determining the boundary of local interference areas.

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