Free-form surface three-axis ball-end cutter equal approximation error finish machining tool path generation method

By importing the surface model into CNC machining, calculating the tool contact point and approximation error with constant height error, and adaptively adjusting the step size, the problem of approximation error calculation in three-axis machining of free-form ball-nose tools is solved, and high efficiency is achieved. Equal error tool path generation.

CN114859815AInactive Publication Date: 2022-08-05SUZHOU UNIV OF SCI & TECH
2 Cites 6 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SUZHOU UNIV OF SCI & TECH
Filing Date
2022-06-02
Publication Date
2022-08-05
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

The existing CNC machining tool path generation method cannot effectively calculate the approximation error of three-axis machining of free-form surface ball-nose tools, resulting in the inability to generate equal-error tool paths, especially due to the five-axis and three-axis, flat-bottomed and ball-nose tools, and curved surfaces. The difference between point cloud and point cloud makes existing methods inapplicable.

Method used

By importing the surface model, setting the processing parameters, calculating the constant bow height error tool contact points, calculating the approximation error between adjacent tool position points, and iteratively adjusting the step size to generate the equal error tool path, using geometric elements to express the bow height error Principle, the knife contact point adaptive discretization method is used to calculate the approximation error, and the step size is adaptively adjusted to iteratively calculate the equal error knife position points.

Benefits of technology

It achieves high-efficiency calculation of equal-bow high-error tool contact points and approximation errors, reduces the number of iterations, improves the efficiency of generating equal-error tool paths, minimizes the number of tool position points that meet accuracy requirements, and shortens the calculation time.

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Abstract

The invention discloses a free-form surface three-axis ball-end cutter equal approximation error finish machining tool path generation method which comprises the following steps: firstly, importing a free-form surface model to be machined, and setting data such as the radius, the line spacing, the approximation error maximum allowable value and the precision of a ball-end cutter; secondly, a group of section planes are planned according to the row spacing to intersect with the curved surface, the intersecting line serves as a cutter contact curve, and an equal-bow-height-error cutter contact iterative search method for driving cutter contact adjustment through the geometric distance is provided for the cutter contact curve on the section planes; the maximum distance between a cutter cutting envelope surface and a cutter contact track line is used as an approximation error, and an adaptive discrete method is adopted to carry out approximation error calculation; and finally, the cutter location points of the equal-bow-height-error cutter contact points serve as initial values, an equal-error cutter location point calculation method of step length self-adaptive adjustment iteration is provided, approximation errors between the cutter location points are all within an allowable range, and therefore the free-form surface three-axis ball-end cutter equal approximation error finish machining cutter path is obtained.
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Citation Information

Patent Citations

  • Method for Generating Equal Error Toolpaths in Parametric Surface Flat End Machining (5-Axis)

    CN112987647B

  • Equal-error tool path generation method for five-axis machining of parametric curved surface flat-bottomed cutter

    CN112987647A

Cited By

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  • A method and system for generating paths for diamond turning tools in the normal oscillating cutting of free-form surfaces.

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  • Layered row cutter path planning method for rough machining of free-form surface

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