工厂钣金工、配管工,在制作弯头样板时,一般多沿用传统的习惯做法,即放大样。这个方法费工费料,而且精度也较低。从一些建筑图集或图册上,虽然也能查出弯头的背高与腹高,但所给的值一般都受弯曲半径和等分圆周份数的限制,在实际工作中不好照搬。放大样实质上就是以弯曲半径为中心,以钢管的半径作圆,把圆周长分为若干等份后,找出几条相应的线段长度,移至展开图上,按照线 Factories, metalworkers, and plumbers usually use traditional practices, ie, enlargement, when making elbow templates. This method is costly and less accurate. From some architectural atlases or atlases, although the back height and belly height of the elbow can also be detected, the value given is generally limited by the bending radius and the equally divided circumferential number, which is not easy to copy in practical work. . Magnification is essentially the bending radius as the center. The radius of the steel tube is used as a circle. After the circumference is divided into several equal parts, several corresponding line lengths are found and moved to the unfolding drawing.