渐缩绞龙尤其是微渐缩绞龙在通常条件下,不易画出绞龙的锥顶点,这类绞龙片的实样画制和展开都是比较困难的,多年来一直采用三角法作近似展开,由于渐缩绞龙片的特点是一片一个规格,因此用三角法一片一片的展开需要繁重的劳动,且因作图复杂而容易出错,我经过多年的研究,创造了一种新展开法,制作方便、准确性高,现介绍如下供从 Reduced auger especially micro-tapered auger Under normal conditions, it is not easy to draw the auger vertex, such kind of auger piece real drawing and unfolding are more difficult, for many years has been the use of trigonometry Approximately unfolded, as the characteristics of the tapered gullet is a piece of a specification, so the triangular method to develop one by one requires heavy labor, and complex and easy to make mistakes in the drawing, I after years of research to create a new expansion France, easy production, high accuracy, are presented below as follows