African round punch and die of the automatically
Abstract: The CAD system in the die, using the method of circular arc polygons of non-circular punch and die shape to deal with an automatically generated under the vertical view of the way to the main view.
In the design of stamping dies, if the mold punch and die cutting the shape such as round or rectangular simple shape, punch and die are relatively easy to design, and cutting the size of the calculation is very simple. However, not all of the stamping die die punch and edge shape of the rules are, there are many stamping die die punch and the edge shape is irregular, which is composed of multi-segment or multi-paragraph arc segment and multi-paragraph composition, or entirely composed of multi-arc, such punch and die edge of the calculation and design are very troublesome.
As a result of non-circular punch and die of non-circular shape of the complex, in order to facilitate the processing, both in the design of the non-circular punch and die of non-circular cavity into a straight cylindrical design, which automatically designed using a computer more convenient. If you use the computer to achieve such a die punch and the automatic generation and combination of CAM, not only would the designers of the labor intensity, and can greatly improve the mold design and processing efficiency and quality.
A variety of non-circular punch can be divided into two situations: first, non-circular punch vertical view of the contour line segment composed entirely; second, non-circular punch from the vertical view contour line and circular arc or entirely arc formed. For the second scenario, the punch in the generation before the main view, vertical view of the need for proper handling of the arc, which is under the arc of the situation, consider the arc in the main view of the projection effects, or over a period of several segments replace the vertical view of the arc, the method referred to as the "arc of the polygon."
Analysis of various types of arc, in accordance with projection principle, the alternative arc can be divided into three situations: (1) if paragraph arc AB, as long as the level of circular arc with a diameter no point, line segment AB can be used to replace a round arc AB, as shown in Figure 1a. (2) if paragraph arc AB, as long as the level of arc in diameter with a round there are two intersection points C and D, available to the three segments AC, CD, DB alternative arc AB, as shown in Figure 1b. (3) if paragraph arc AB, as long as the level of arc in diameter and round, there is a point of intersection C, it can be two line segments AC, CB to replace arc AB.
