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Gear Sharper/ 2017-04-08 11:48
Gear shaper, is a kind of metal cutting machine tools.It used gear sharper cutter to process internal and external spur gear, helical cylindrical gears and other gear parts by the method of gear forming.
Introduction of Gear Sharper
Using the gear sharper cutter as the cutting tool to process the gear and rack,this kind of processing method is called "gear shaping".When the gear is processed, the cutter moves up and down, with the workpiece for the relative rolling at the same time.
The cutting tool is also gear shaped having the same pitch as the gear to be cut. However number of cutting teeth must be less than that of the gear to be cut for internal gears. For external gears the number of teeth on the cutter is limited only by the size of the shaping machine. For larger gears the blank is sometimes gashed to the rough shape to make shaping easier.
The principal motions involved in rotary gear sharper cutting are of the following :
Cutting Motion: The downward linear motion of the cutter spindle together with the cutter .
Return Stroke: The upward linear travel of the spindle and cutter to withdraw the cutter to its starting position.
Indexing Motion: Slow speed continuous rotation of the cutter spindle and work spindle to provide circular feed, the two speeds being regulated through the change gears such that against each rotation of the cutter the gear blank revolves through n/N revolution, where "n" is the number of teeth of the cutter, and "N" is the number of teeth to be cut on the blank.
Completion of Cutting Operation: The indexing and reciprocating motions continue until the required number of teeth to the required depth are cut all along the periphery of the gear blank.
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