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Based on the actual tool contour CNC machining tool path calculation

Author: WangJun
Tutor: DuanZhenYun；ZhaoWenHui
School: Shenyang University of Technology
Course: Mechanical Manufacturing and Automation
Keywords: Complex surface Cutter Profile Toolpath Precision
CLC: TG659
Type: Master's thesis
Year: 2009
Downloads: 84
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Abstract

With the continuous development of science and technology, engineering freeform production as well as research projects are already the most complex and frequently encountered surfaces, these more complex shape parts, precision requirements are also increasing, CNC machining, The quality of track tooling machining accuracy, especially on the free-form surface machining accuracy has a very important influence. Toolpath is calculated in CNC machining of the most important but also the most widely studied in-depth content, the tool path will directly affect the machining precision and efficiency. The traditional method is to use the tool path calculation tool ideal profile shape, but the effects of the tool wear profile shape manufacturing error and error will affect the machining accuracy. Thus proposed the use of the actual contour of the tool for CNC machining tool path calculation. First collected by the CCD image sensor rotating tool with image after image acquisition requires the use of Matlab image processing technology for image conversion to obtain a binary image, and extract the contour of the tool, and finally use the same Matlab image computing tool for the extracted contour image superimposed, the final tool contour image. Contours superimposed images obtained after the tool is made up of many data points consisting of the use of interpolation cubic spline function approach to these data points were fitted to obtain the tool contour curve equation. Specific principle is that the data points obtained after the coordinates specified endpoint conditions upon request to calculate the slope of each curve, and finally by-point calculations piecewise cubic spline interpolation function. Using minimum distance algorithm to compute a knife sites. After the calculated curve equation, move the tool coordinate system to the workpiece coordinate system, so in the same coordinate system, using minimum distance algorithm to compute a first cut contact, depending on the tool contour curve and the relationship between the tool center to get the first a cutter location coordinates of the point. Then the tool contour curves laterally move a short distance, again with a minimum distance algorithm has to get a second knife sites. So get all the tool position coordinates, so calculate the tool path. Using the tool for the actual contour toolpath calculation method can effectively improve the precision, and the ability to detect whether a new tool contour meet the standard requirements. The method can be widely used in the field of rotational tooling.

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