• Internal gear 内齿轮, 齿圈（也称为annular gear ）
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Helical gear 斜齿轮
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• Worm 蜗杆 Worm wheel 蜗轮 • 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
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• Broach 拉刀
拉齿
• 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。
• 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。
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Text tour
Gear planing uses a reciprocating rack, stroking in the direction of the helix on a gear with a gradual generation of form as the rack effectively rolls round the gear blank. The rack is relieved out of contact for the return stroke as in normal shaping or planing.
刨齿采用往复运动的齿条刀，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。与普 通的刨削加工相同，在回程中齿条刀与齿轮脱离接触。
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Gear shaping is inherently similar to gear planing but uses a circular cutter instead of a rack and the resulting reduction in the reciprocating inertia allows much higher stroking speeds.
Lesson 38 Gear Manufacturing Methods
• Terminology
• Text tour
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Terminology
• Annular • Shaped like or forming a ring. • 环形的，轮状的：形状像环或形成环状。
required.
滚齿是最常见的金属切削方法。它采用齿条展成原理，
但是通过安装在旋转刀具上的许多“齿条”来避免缓慢
的往复运动。这些“齿条”轴向排布，形成了有缝的蜗
杆。由于滚刀和工件均不作往复运动，因此滚齿加工时
的
金
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插齿加工在本质上与刨齿加工类似，只是采用了圆形刀具来 取代齿条刀。
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For helical gears, a helical guide is required to impose a rotational motion on the stroking motion; such helical guides cannot be produced easily or cheaply so the method is only suitable for long runs with helical gears since special cutters and guides must be manufactured for each different helix angle.
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• 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.
加工斜齿轮时，需要有一个能够产生绕插齿运动行程本身 旋转的螺旋导轨。这种螺旋导轨不易制造，或者说其制造 成本较高。由于对每一种不同螺旋角的齿轮，应该制造不 同参数的插齿刀和螺旋导轨，因此这种方法仅适用于斜齿 轮的大批量加工。
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Gear hobbing, the most used metal cutting method, uses the rack generating principle but avoids slow reciprocation by mounting many “racks” on a rotating cutter. The “racks” are displaced axially to form a gashed worm. Metal removal rates are high since no reciprocation of hob or workpiece is
A gear shaving cutter looks like a gear which has extra clearance at the root (for swarf and coolant removal) and whose tooth flanks have been grooved to give cutting edges. It is run in mesh with the rough gear with crossed axes so that there is in theory point contact with a relative velocity along