The curve between the 1st and 2nd points should pass the 1st point and the 2nd point. The curve between the 2nd and 3rd points of the board in the set of molds required for the manufacture of the automobile body stamping parts should pass the 2nd point and the 3rd point. The blanking die, the mold designer often specifies some sparse points in the plane, and the curves between points 7 and 8 should pass through points 7 and 8.
The required cutting edge curve must pass through these points without giving the edge, which lists 14 equations. At the second point, the left and right first-order curves are composed of which line segments and arcs or by which equations the derivative values ​​should be equal; the left and right second-order derivative values ​​should also be equal non-circular curves.
This is also true at points 3, 4, 5, 6, and 7. Thus, it can be listed 12 in order to facilitate the manufacture of the blanking edge (cylinder) and to ensure its equation. At the 1st point, boundary conditions can be specified, such as the amount and accuracy of the boundary, and CNC milling is often required. The general number control is zero for the second derivative.
The same is true at the 8th point. In this way, the milling machine has only line segment and circular interpolation functions, and there is no non-circular curve interpolation to list two equations. That is to say, the segments of the cutting edge curve should not be the line connecting the above 28 equations.
I use the Gaussian main element to eliminate the arc, which should not be the other. To the software, the computer automatically solves the 28 pending values. If the edge curve is not smooth and there is a sharp corner somewhere, the milling then yields a 7-segment curve described by a 3rd degree polynomial, respectively.
When machining one of the convex and concave molds, it is inevitable that there is no "sounding" that cannot be milled. These 7 segments collectively form the entire curve required, and it will add trouble to the manufacturing mold through the 8 pieces, and it is not conducive to ensuring convex and concave mold points, and smooth, and the curvature is continuously changed.
The punching gap is uniform and affects the quality of the mold. Therefore, using the software I have compiled, it is convenient to calculate the smooth edge curve on the curve. The radius of curvature of the curve should be enough for the coordinates of multiple points. Then I use another software compiled by me to calculate that the milling is larger than the radius of the milling cutter. The curvature change is preferably continuous. When the contour of the curve is compared, the center of the milling cutter should be evenly distributed.
Once the blanking die blanking edge (two-dimensional curve) is solved, the coordinate data of a series of positions is solved. By flexibly manipulating the axial movement of the milling cutter, the CNC milling and trimming die cutting edge has passed the verification on the CNC milling machine of our factory. It is not difficult to solve the positive port (three-dimensional curve) and has been used for production.
(Finish)
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