EDM automatic programming system based on graphic exchange file method (3)

Straight line contour For a straight line contour, the straight line needs to be translated by a distance b along the normal direction of the direction of the pass. Knowing the point A(x _a , y _a ), B(x _b , y _b ) at both ends of the straight line, the straight line equation y= Kx+c
In the middle
After translation, the straight line equation is y=kx+c', and c' can be calculated by
c'=cf(1+k ² ) ^? (1)
The positive and negative signs in the formula are selected according to the machining direction and the internal and external characteristics of the contour. Let the angle between the vector and the X axis be a, and Table 1 is the value in different cases.
The compensation of the arc contour arc contour is simpler than the straight line, and only involves the increase or decrease of the arc radius r. First, we must judge the direction of the arc. From the DXF file, we can get the starting point and end point coordinates of the arc, the radius of the arc, and the starting and ending angles, so that the tangent of the starting point and the end point of the arc can be obtained, and the cross product of the starting point and the ending point is determined. The direction of the arc. The judgment rule is: the cross product is positive, the inverse circle: the cross product is negative, and the round is round. After the arc direction is judged, the tool path compensation is performed using Table 2.

After processing, the automatic compensation of the tool path is completed. However, when the two entities intersect to form a sharp corner, the sharp corners need to be transitioned to avoid the interference generated by the tool at the sharp corner or the discontinuity of the tool trajectory. We solved this problem by preprocessing the sharp corners with a circular transition.

According to the last tool trajectory, the NC code can be generated after post processing.

4 Conclusion

The DXF file exported by AutoCAD provides the basis for CAD/CAM integration of EDM. According to the DXF file structure, this paper develops the interface software for extracting the entity information, and proposes two methods to determine the processing direction. They can effectively judge the direction of rotation of the plane figure. The tool path can be calculated based on the machining direction and the internal and external characteristics of the contour. This laid the foundation for the final NC code generation. Tool trajectories can be obtained quickly and reliably using the methods described herein. However, the tool trajectory obtained according to the method of this paper is a theoretical trajectory, and the loss of tools during processing is not considered. To realize the integration of CAD/CAM in EDM milling and achieve better process results, it is also necessary to solve the problem of dynamic compensation of tool loss during processing.

Beaded Chandeliers

Looking for a beaded chandelier to decorate your home? beaded Chandeliers are known for their long beaded chains that hang from rings that hold the light together. These lighting devices have become more and more popular in the past few years. Whether you're looking for a Bohemian look or a farmhouse style, beaded chandeliers are perfect for an entrance, dining room or even a bedroom.

White Beaded Chandelier,Black Beaded Chandelier,Diy Beaded Chandelier,Blue Beaded Chandelier

INSHINE LIGHTING CO.,LTD , https://www.inshinelight.com