All these conclusions and methods are valuable in instructing the design and manufacture of envelope surface of cylinder family.
这些结论和方法对指导圆柱族包络面的设计与制造具有重要价值。
The surface of the sun is a glowing gas envelope.
太阳的表面是一层炽热的气体层。
Using a helical involute pinion surface to form the grinding worm surface, a helical face gear is formed via a two-parameter worm envelope.
针对面齿轮硬齿面磨削加工中存在的困难，提出用蜗杆砂轮磨削的双参数法来磨削面齿轮。
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