The processing method is simpler and more accurate than the other spline fitting method because the arc spline fitting method, and the obtained fitting curve gives the circular arc information directly used for numerical control machining. This information includes the starting coordinates of the arc, the radius of the arc, the direction of the arc, and so on. The following paper discusses the formation and algorithm of arc fitting. The position of the tangent point is given by the angle of Aj and Bj. When we specify the arc spline, the common tangent point T is taken on the mid-perpendicular line of the node connection. This allows the calculation to be simple and each The segment arc is relatively uniform. When the curvature of the curve is large and the value of the curve is relatively thin, the curvature may change the sign, and the curve fitted by the arc spline will have an inflection point, resulting in a smoothing. In order to prevent this phenomenon, a point is encrypted between Pj and Pj+1, which is taken on the vertical line of PjPj+1 or taken at the inner center of vPjPj+1C (such as the curve of the processing of the straight line segment) The last paragraph is a straight line segment, which can be uniformly processed by the following methods to avoid the inconvenience caused by segmenting the straight line and the curve. When Pj, Pj+1 and Pj+2 are collinear, 5jX0, 5j+1X0, 5j+2X0. Corresponds to Bj=5j, Aj=0, and Bj+2=0, Aj+2=5j+2 in the string-cut angle relationship. For Pj point, in order to make Aj=0, it can be in relation KjAj -1-3Aj+LjAj+1=bj+Gj, let Kj=Lj=0, bj=Gj=0 for Pj+1, 5j+1=0, Aj+1=Bj+1=0, so you can continue Let Kj+1=Lj+1=0, bj+1=Gj+1=0. For Pj+2 points, let Kj+2=1, Lj+2=0, bj+2=35j+2, Gj+ 1=Aj+1 thus obtains bj+2=5j+2, and Bj+2=0 substitutes the above relation into the matrix in the formula, and the required straight line can be automatically generated in the unified chasing method. AutoCAD It is legal to determine the end point of the arc radius curvature and the arc direction of each segment, and the program to be compiled is also very complicated, thus increasing the workload of programming. Currently, we use general drawing soft. The arc fitting function of AutoCADR14 greatly simplifies the calculation process.
The specific steps are as follows: (1) Using AutoLISP language supported by AutoCADR14 to compile a data input program, read all discrete points into AutoCADR14 and connect the discrete points with polylines. (2) Edit the polyline using the PEDIT command in AutoCADR14. Select the Fit option to process the polyline into a polyline connected by multiple arcs. Due to the direct use of the arc fitting function provided by AutoCADR14, the accuracy and smoothness of the curve fitting can be greatly improved. (3) Use AutoCADR14 to generate a data exchange file (*.DXF file) of the fitted curve, that is, use the DXFOUT command to output the fitted graphic data to the specified exchange file, so that the graphic file can be converted into an applicable application. The data file exchanged by the program. (4) Using the general algorithm language programming, the data in the graphics exchange file is processed and output to the data file in a code format acceptable to the numerically controlled machine tool. (5) Use the programmer to edit the above data file, and add the machine tool auxiliary code in the first line to convert the file into a processing file that the CNC machine tool can directly accept. (6) This file is input to the CNC machine through the disk medium to realize the processing of the list curve.
When processing the list point curve, the above two methods can meet the specified requirements, but the latter method borrows the curve fitting function of Au-toCADR14, eliminating a lot of cumbersome fitting calculation programming, which can be done. Fast and accurate, but you must also write an interface program to handle the graphics data files accordingly. In general, the latter method is more convenient and reliable. After this processing, the processing of such list point curves can be made by the application by the input and output of the data, and the final result is a file that can be directly used for numerical control processing. This not only has data processing functions, but also has the post output function of CAM software, which initially has the characteristics of CAD/CAM software. This not only reduces the workload of a large amount of data input and output, but also improves the reliability of the data. With this method, the processing of the list point curve can be successfully achieved and the specified requirements and precision can be achieved.
(Finish)
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