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Triangularization-based complex cavity high-speed numerical control milling spiral path generation method

A CNC milling and triangulation technology, applied in the direction of program control, computer control, general control system, etc., to achieve the effect of improving kinematics characteristics and avoiding sudden changes in curvature

Active Publication Date: 2020-07-31
DALIAN UNIV OF TECH
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Problems solved by technology

[0003] In order to overcome the deficiencies of the current spiral path design method for high-speed NC machining of complex cavities, the present invention provides a method for generating a helical path for high-speed NC milling of complex cavities based on triangulation, so as to realize high-speed NC machining of complex component cavities

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  • Triangularization-based complex cavity high-speed numerical control milling spiral path generation method
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  • Triangularization-based complex cavity high-speed numerical control milling spiral path generation method

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Embodiment Construction

[0034] A flow chart of a method for generating a helical path for high-speed NC milling of complex cavities based on triangulation in the present invention is as follows figure 1 shown. Below, with figure 2 The machining of the contour of the vehicle seat cavity is shown as an example, and the specific implementation process of the present invention will be described in detail in conjunction with the accompanying drawings and implementation steps. The specific implementation process is as follows:

[0035] (a) Triangulation of the cavity plane processing area, the specific steps include:

[0036] a1. First determine the sampling interval in the x direction and y direction of the cavity plane processing area and Its calculation formula is as follows:

[0037]

[0038] In the formula, X b and Y b is the length of the plane bounding box of the cavity processing area in the x direction and y direction, int(·) is the rounding operation, L Δ is the side length of the m...

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Abstract

The invention belongs to the technical field of multi-axis numerical control machining, and relates to a triangularization-based complex cavity high-speed numerical control milling spiral path generation method. The method comprises the following steps: dividing each layer of plane machining area of a cavity into triangular grids; establishing a mapping relationship between a cavity triangulationplane processing region and a plane circular region based on grid localization mapping; calculating the pitch increment between the planar spirals on the circular domain, and generating a piecewise linear guide spiral curve through the spiral linear interpolation between the adjacent circles; inversely mapping the guide spiral curve back to a cavity plane machining area to generate a spiral machining path; and finally, smoothing the spiral path by utilizing the B spline curve to generate a smooth and continuous complex cavity high-speed numerical control milling spiral path. The spiral numerical control machining path generated through the method can achieve continuous milling of a complex component cavity, curvature sudden change in a traditional machining path is avoided, and thus stableand smooth movement of a cutter is guaranteed, and the motion mechanical property of a numerical control machine tool during complex cavity machining is improved.

Description

technical field [0001] The invention belongs to the technical field of multi-axis numerical control machining, and relates to a method for generating a helical path for high-speed numerical control milling of complex cavities based on triangulation. Background technique [0002] CNC machining is a symbolic processing technology in modern industry, and it occupies a dominant position in the processing of precision and complex parts in the automotive, aerospace, shipbuilding, mold and other industries. According to statistics, more than 80% of CNC machining operations belong to cavity milling, so designing efficient and reliable cavity processing paths, especially spiral processing paths that can realize continuous milling, has become the key to efficient processing of complex cavities. Sun Yuwen et al. invented the patent "A Helical Guided Curved Surface CNC Machining Method" (Patent No.: CN200610134265.6), which realized the design of the helical machining path on complex cu...

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Application Information

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IPC IPC(8): G05B19/4099G05B19/41
CPCG05B19/4099G05B19/41G05B2219/34083
Inventor 徐金亭孙玉文潘通
Owner DALIAN UNIV OF TECH
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