In this paper a new grinding method, using small cylindrical face grinding wheel to grind straight outline hourglass worm, is put forward and the mathematical model is set up.

本文提出了用小圆柱面砂轮磨削直廓环面蜗杆的新方法，建立了数学模型。

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SHOULDER: Defect found on rib or outer diameter; a raised edge on rib face caused by grinding wheel; raised surface at either end of outer diameter raceway.

挡肩：外径或挡肩上发现的缺陷；挡肩上由于磨床砂轮所造成的突起；在外径滚道两端的突起。

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Cylinders, straight cups, and flaring cups are used for surface grinding with the end face of the wheel.

用其端面进行表面磨削的圆柱、直杯及外展杯状砂轮。

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