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3.闭合平面图形的形成 在平面几何学中,关于点、线、面、体形成关系的定理为:点动成线,线动成面,面动成体。其中,所谓“线动成面”就是说,任意线段在平面内运动的轨迹都可以构成一个平面图形。同时也可以看作是若干个全等的平面图形依这个任意线段为拼合边进行无缝隙拼合而构成的闭合平面图形。 围成冲裁件平面图形的母线,经过在两条平行直线中平移、旋转、相向移动、背向拉开等运动,使母线变成相邻两平面图形的共线,形成多个全等平面图形的无缝隙拼合,构成能进行无搭边排样的闭合平面图形。 众所周知,能实施无搭边排样的闭合平面图形必须具有与条(带)料两边重合的直线。所以,要进行无搭边排样的冲裁件在无缝隙拼合构成闭合平
3. The formation of closed plane graphics In plane geometry, the point, line, surface, body forming the relationship between the theorem as follows: point into a line, moving into the surface, the surface moving body. Among them, the so-called “line into a surface” means that any line in the plane of the trajectory of movement can form a plane graph. At the same time can also be seen as a number of congruent planar graphics according to this arbitrary line segment for the split edge of the flat without the formation of a closed flat graphics. The generatrix that forms the plane figure of blanking piece, after moving in two parallel straight lines, such as translating, rotating, moving in the opposite direction and pulling away in the opposite direction, make the generatrix become the collinear of the two adjacent plane figures and form multiple congruent planes Graphic seamless combination, constitute a seamless plane can be closed with a flat pattern. It is a well-known fact that a closed planar pattern that can be laid out without a blank side must have a straight line that coincides with both sides of the strip. Therefore, to carry out no side of the blanking blanking pieces in the seamless split to form a closed flat