外文翻译--链轮的制造方法.doc

Gear manufacturing methods Abstract This paper deals with the production process of the chain wheel. It Detailed description of gear planning ,gear shaping, gear hobbing, gear broaching , gear shaving ,gear grinding, and introduce the teeth of the production of a variety of methods and the used occasions. Key Words gear planning ,gear shaping, gear hobbing, gear broaching , gear shaving ,gear grinding, Gear Planing the shape of the space between gear teeth is complex and varies with the number of the gear as well as tooth module, so most gear manufacturing methods generate the tooth flank instead of forming . Gear planing uses a reciprocating racks, stroking in the direction of the helix on agear with a gradual generation of from 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 planning .It has the great advantage that the cutting tools is a sampling rack with (nearing) straight sided teeth which can easily be ground accurately .This method is little used for high production because it is relatively slow in operation due to the high tool and slide mass; for jobbing purpose the slow stroking rate does not matter and low tool cost give an advantage where unusual sizes or profile modification are required . Gear shaping gear shaping is inherently similar to gear planning but uses a circular cutter instead of a rack and the resulting reduction in the reciprocating inertia allows much higher stroking speed ;modern gear shapers cutting car gears can run at 2000 cutting strokes per minute .The shape of the cutter is roughly the same as an involute gear but the tips of the teeth are rounded . The generating drive between cutter and workpiece does not involve a rack or leadscrew since only circular motion is involve a rack or leadscrew since only circular motion is involved . The tool and workpiece move tangentially typically 0.5 mm for each stroke of th