different helix angle的用法和样例：
- The equations of different helix in cross wedge rolling in different coordinates were studied in this paper.
- The influence of the force location and helix angle on the bend stresses of pinion and face-gear is discussed.
- It adopts large helix angle and special arc configuration that is suitable for processing some hard materials such as stainless steel and titanium etc.
- It is found from the stability graphs that the milling stability improves with the increase of the helix angle and the normal rake angle.
- There is no common normal in the conical involute gear and the fixed chordal tooth thickness can not be measured accurately because of the coexistence of helix angle and taper.