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扇形坐标法,也称放射线法,此法适用于展开正圆锥形的构件,也适用于以正圆锥为基础上下端均带有各种截头形式和侧面接有支管的构件。可用等分扇形坐标法展开的一些构件见图5。扇形坐标是指x轴为正圆锥底的展开弧线,一般用底圆的圆周长分成十二等分(或更多等分),作为坐标格,y轴指从顶点至底圆的素线长度,即扇
Fan-shaped coordinate method, also known as radiation method, this method is suitable for the development of positive conical member, also applies to the positive cone on the basis of the lower end with a variety of truncated forms and the side of the branch pipe connected components. Figure 5 shows some of the components that can be exploded using the fan-shaped coordinate method. The fan-shaped coordinate refers to the unwinding arc with the positive x-axis at the bottom of the cone, which is usually divided into twelve equal parts (or more) by the circumference of the bottom circle. As the coordinate grid, the y-axis refers to the prime line from the apex to the bottom circle Length, ie fan