武科大机械专业英语Lesson39.pptVIP

《电子信息工程专业英语教程》 Lesson 39 Gear Manufacturing Methods Terminology Text tour Terminology Annular Shaped like or forming a ring. 环形的，轮状的：形状像环或形成环状。 Annular gear 内齿轮, 齿圈（也称为internal gear） Hob 滚刀 Worm 蜗杆 Worm gear 1. A gear consisting of a spirally threaded shaft and a wheel with marginal teeth that mesh into it 蜗轮蜗杆副 2. The toothed wheel of this gear, a worm wheel 蜗轮 Broach 拉刀 Swarf Fine metallic filings or shavings removed by a cutting tool. 小铁屑：用锉或剃等加工方法去除的细小金属屑。 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. 砂轮修整：使砂轮表面磨钝的磨粒上产生新的锋利的切削刃，使其能够更有效地进行切削工作。 Text tour Gear Planing（刨齿） 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（模数），so most gear manufacturing methods generate the tooth flank (齿腹) instead of forming（采用展成法加工齿面而不是采用成形法加工）. * * 《机械工程专业英语教程》 * * 《机械工程专业英语教程》 《机械工程专业英语教程》 * Helical gear 斜齿轮 * * 《机械工程专业英语教程》 * * 《机械工程专业英语教程》 * * 《机械工程专业英语教程》 * * 《机械工程专业英语教程》 * 《机械工程专业英语教程》 * * Gear planing uses a reciprocating rack（往复运动的齿条刀）, stroking（击、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 (齿轮毛坯) （当齿条刀绕齿轮坯料滚切并沿其螺旋线方向运动时，齿形就会被逐渐展成）. …… ……The rack is relieved out of contact（脱离接触）for the return stroke as in normal shaping or planing（与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(刀具为具有直线齿形或者接近与直线齿形的齿条，其齿面易于进行精确磨削加工). …… ……This method is little used (几乎不用) for high production because it is relatively slow in operation due to the high tool and slide mass(由于刀具和滑枕的质量较大)；for jobbing（重复性很小的工作）purposes the slow stroking rate does not matter and low tool costs give an advantage where unusual sizes or profile modifications are required. （对于单件或者少量的齿轮加工而