A Method for Determining Smooth Toolpath in Triangular Mesh Milling

Abstract

The invention belongs to the numerical control processing technology and particularly discloses a triangular mesh milling smoothing tool path determination method. According to the method, firstly, a tool path border line, a cutting beginning center point and the cutting turn number are determined, each turning arc center of a cutting area is further determined, quadratic B spline curve control point s are selected after characteristic points are extracted, and a quadratic b spline curve is generated. The method is advantaged in that a tool path is generated according to the actual shape of a mesh bottom surface area, the method is simple and convenient, the tool path smoothing degree is substantially improved compared with a traditional numerical control milling method, program computing complexity is relatively small, good stability is realized, tool movement along rows can be completely eliminated, and high-order smoothing demands can be satisfied.

Description

technical field [0001] The invention belongs to numerical control processing technology, and in particular relates to a tool path generation method for grid feature processing in the field of numerical control milling processing. Background technique [0002] Ordinary milling machine processing, the knife method is often used in the programming of CNC milling programs with low feed rates. The method of relying on the knife means that the same cylindrical milling cutter is used in the milling process as the fillet between the side walls of the mesh, and the tool path is sharp at all the reversal points of the contour. At the same time, the reciprocating tool rail or circular tool rail designed on the inner side is also sharp at the reversing position. [0003] With the continuous improvement of the performance of CNC machine tools and the urgent need to improve cutting efficiency, the disadvantages of the above-mentioned tool paths have become more and more prominent. Becau...

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Problems solved by technology

Such measures have significantly improved the harsh working conditions at the reversing position, and the tool paths in other areas remain unchanged. The main disadvantage is that it is difficult to achieve high-order smoothness at the splicing joint, which cannot meet the requirements of high feed speed

The other is to propose a new tool path generation method. Each grid has only one smooth tool path, which completely eliminates the tool movement between rows, and can meet the needs of high-order smoothing. However, many algorithms need to solve Large-scale differential equations are complicated to calculate, so there are often problems such as large amount of calculation, long calculation time, and slow tool path generation speed, and the rationality of modeling has a great impact on the results, and poor control can easily cause the shape of the tool path to be distorted

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