Method and system for finding intersection between tool and workpiece surface in five-axis milling
A surface intersection and cutting tool technology, applied in the field of milling processing and manufacturing, can solve the problems of low calculation efficiency and narrow application range, and achieve the effect of high calculation efficiency and wide application range
Active Publication Date: 2022-05-20
武汉数字化设计与制造创新中心有限公司
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is to provide a method and system for finding the intersection between the tool and the workpiece surface in five-axis milling in view of the defects of low calculation efficiency and narrow application range in the prior art
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[0037] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0038] Such as figure 1 As shown, a method for finding the intersection between the tool and the workpiece surface in five-axis milling is provided, including the following steps:
[0039] S1. Discretize the tool surface along the axial and circumferential directions, and the resulting discrete axial height and circumferential angle are:
[0040]
[0041] Among them, z i is the discrete axial height, is the discrete circumferential angle, H is the tool length, N zis the axially discrete quantity, is the circumferential discrete quantity, i=1,2,...,N z , Use (i,j) to represent discrete ...
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The invention discloses a method for intersecting the curved surface of a tool and a workpiece in five-axis milling. By discretizing the curved surface of the tool along the axial and circumferential directions, the z 1 According to the search in the circumferential direction, calculate the normal vector angle of the nearest plane of the workpiece adjacent to the discrete points (i, j) and (i, j+1) on the tool surface, if the adjacent discrete points (i, j) and ( i, j+1) The angle between the normal vector of the nearest plane of the workpiece is less than the threshold, then (i, j) is the intersection point, and then z 1 Intersection point of layers; then from z 2 To search layer by layer along the axis, the zth i layer search with z i‑1 The intersecting position determined by the layer is used as a reference to expand the search until the intersecting points of all layers are searched, and finally all the intersecting points searched are calculated by the curve fitting method. The method of the invention has higher calculation efficiency and wider application range.
Description
technical field [0001] The invention relates to the field of milling processing and manufacturing, in particular to a method for finding the intersection of a tool and a curved surface of a workpiece in five-axis milling. Background technique [0002] Five-axis end milling is widely used in the processing of turbine blades, propeller blades, aircraft landing gear and other structural and surface complex parts to avoid interference between tools and workpieces and improve processing efficiency and surface quality. During the above-mentioned processing, the cutting force is an important factor affecting the processing accuracy, tool life and processing vibration, and its prediction and accuracy are of great significance to the optimization of process parameters. The modeling of five-axis milling force usually uses a mechanical model, in which the intersection of the tool and the workpiece surface is crucial to judging the cutting state of the micro-elements of the blade. [0...
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IPC IPC(8): G06F30/17G06Q50/04
CPCG06F30/17G06Q50/04Y02P90/30
Inventor 彭芳瑜唐小卫吴嘉伟杨岑岑周林邓犇
Owner 武汉数字化设计与制造创新中心有限公司