Axis vector programming method for non-developable ruled surface blade side milling cutter
A technology of side milling cutter and axis vector, applied in the direction of electrical program control, digital control, etc., to achieve the effect of improving processing efficiency and shortening processing cycle
Inactive Publication Date: 2016-08-17
BEIJING JIAOTONG UNIV
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Problems solved by technology
Due to the distortion of the non-developable ruled surface blade, the direction of the normal vector on the same generatrix of the non-developable ruled surface is different, and the resulting tool axis vector will inevitably produce an overcut error
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[0068] Such as Figure 6 The geometric shape of a centrifugal compressor impeller, in which the impeller blades are long and short blades, and the long and short blades are non-developable ruled surfaces. Now take the side milling process of the pressure surface of one of the long blades as an example, as shown Figure 7 is the blade shape and cutter axis vector of a certain centrifugal compressor. Among them, the surface S 1 is the original non-developable ruled surface, surface S 2 It is the equidistant surface of the non-developable ruled surface, the curve lengths of the two directrixes of the non-developable ruled surface are 96.439mm and 96.372mm respectively, the length of the longest end of the busbar is 24.919mm, and the length of the shortest end is 5.894mm. For side milling of an 8mm end mill, use the two-point method, the least square method, and the method of the present invention to plan the axis vector of the side mill, and take a representative straight gener...
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The invention discloses a vector planning method for the axis vector planning of a non-developable ruled surface blade side milling cutter, which belongs to the technical field of high-precision numerical control processing. The steps of this method are: 1) Find the equidistant surface of the non-developable ruled surface; 2) Find the asymptotic direction of the equidistant surface; 3) Search for a point with a step length of δ along the asymptotic direction; 4) Repeat Steps 2), 3) search for an asymptotic curve on the equidistant surface; 5) process the asymptotic curve and determine the tool axis vector; 6) repeat steps 2), 3), 4), and 5) to obtain the entire The tool axis vector of the non-developable ruled surface. The method proposed by the present invention breaks through the constraints of the existing method when planning the cutter axis vector. First, the equidistant surface of the ruled surface is made, and then the cutter axis vector is planned on the equidistant surface. The theoretical error generated by this method is controlled at the micron level, which is an order of magnitude smaller than the theoretical error generated by the existing method, and meets the high-precision requirements of blade processing. It is an ideal tool axis vector planning method.
Description
technical field [0001] The invention belongs to the technical field of high-precision numerical control machining, and in particular relates to a method for vector planning of a side milling cutter axis of a non-developable ruled surface blade. Background technique [0002] The non-developable ruled surface is processed with high efficiency by side milling, but there is a theoretical error in the line contact itself. Therefore, in order to meet the high-precision processing requirements, domestic manufacturing companies often abandon the efficient side milling method and use ball-end cutter point milling to improve efficiency. Change precision. The control of theoretical error in side milling of non-developable ruled surface is a difficult point, among which the planning of tool axis vector is the most critical, which directly affects the machining error of ruled surface. The normal vector is offset by a distance of one tool radius to obtain the tool axis vector. The exist...
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IPC IPC(8): G05B19/19
Inventor 蔡永林李建勇孙卫青
Owner BEIJING JIAOTONG UNIV