武科大機械行業管理專業英語Lesson39(PPT 43頁)

主要內容：
Dressing
Dressing is the process of conditioning worn grains on the surface of a grinding wheel by producing sharp new edges on grains so that they can cut more efficiently.
砂輪修整：使砂輪表麵磨鈍的磨粒上產生新的鋒利的切削刃，使其能夠更有效地進行切削工作。
Gear Planing（刨齒） The shape of the space between gear teeth is complex and varies with the number of teeth on the gear as well as tooth module（模數），so most gear manufacturing methods generate the tooth flank (齒腹) instead of forming（采用展成法加工齒麵而不是采用成形法加工）.
Gear planing uses a reciprocating rack（往複運動的齒條刀）, stroking（擊、打、切）in the direction of the helix（螺旋） on a gear with a gradual generation of form as the rack effectively rolls round the gear blank (齒輪毛坯) （當齒條刀繞齒輪坯料滾切並沿其螺旋線方向運動時，齒形就會被逐漸展成）. ……
……The rack is relieved out of contact（脫離接觸）for the return stroke as in normal shaping or planing（與普通的刨削加工相同）. It has the great advantage that the cutting tool is a simple rack with (nearly) straight sided teeth which can easily be ground accurately(刀具為具有直線齒形或者接近與直線齒形的齒條，其齒麵易於進行精確磨削加工). ……

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