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论述了美国格里森公司（ＧｌｅａｓｏｎＷｏｒｋｓ）加工弧齿锥齿轮的最新方法──精确双重螺旋法（ＥｘａｃｔＤｕｐｌｅｘ）．采用这种方法加工大轮和小轮时齿槽两侧是用一把双面刀盘同时切出的，得到轮齿的收缩方式为双重收缩齿，由于轮齿的双重收缩，使得大轮和小轮的根锥角同标准收缩齿相比发生了变化。推导出大轮和小轮在双重收缩方式下根锥角之和的计算公式，按倾斜点齿高比例分配给大轮和小轮，确定出大轮和小轮的几何尺寸．
The latest method of machining spiral bevel gears of America Gleason Works is described - ExactDuplex. When this method is used to process the big wheels and the small wheels, both sides of the tooth groove are cut out simultaneously with a double-sided cutter disk to obtain double-contraction teeth whose contraction way is double-retracted so that the big wheel and The root cone angle of the small wheels has changed compared with the standard contraction teeth. The formulas for calculating the sum of root and cone angles of the big wheel and the small wheel in the double contraction mode are deduced and distributed to the big wheel and the small wheel according to the tooth height ratio of the inclined point to determine the geometric dimensions of the big wheel and the small wheel.