ME364_machining_gear - Valery Marinov, Manufacturing...

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Gear Manufacturing 123 Valery Marinov, Manufacturing Technology 6.6 GEAR MANUFACTURING Introduction Because of their capability for transmitting motion and power, gears are among the most important of all machine elements. Special attention is paid to gear manufacturing because of the speci±c require- ments to the gears. The gear tooth ²anks have a complex and precise shape with high requirements to the surface ±nish. Gears can be manufactured by most of manufacturing processes discussed so far (casting, forging, extrusion, powder metallurgy, blanking). But as a rule, machining is applied to achieve the ±nal dimensions, shape and surface ±nish in the gear. The initial operations that produce a semi±nishing part ready for gear machining as referred to as blanking operations; the starting product in gear machining is called a gear blank . Two principal methods of gear manufacturing include ± gear forming, and ² gear generation. Each method includes a number of machining processes, the major of them included in this section. Gear forming In gear form cutting, the cutting edge of the cutting tool has a shape identical with the shape of the space between the gear teeth. Form milling In form milling , the cutter called a form cutter travels axially along the length of the gear tooth at the appropriate depth to produce the gear tooth. After each tooth is cut, the cutter is withdrawn, the gear blank is rotated ( indexed ), and the cutter proceeds to cut another tooth. The process continues until all teeth are cut. The principle of gear forming. Two machining operations, milling and broaching can be employed to form cut gear teeth. Setup of form milling. Form milling of a helical gear.
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Gear Manufacturing 124 Valery Marinov, Manufacturing Technology Each cutter is designed to cut a range of tooth numbers. The precision of the form-cut tooth proFle depends on the accuracy of the cutter and the machine and its stiffness. ±orm cutters for Fnishing cutting ( Left ) and for rough cuts ( Right ). Dividing head (
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This note was uploaded on 12/11/2010 for the course MECH 364 at Cornell University (Engineering School).

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ME364_machining_gear - Valery Marinov, Manufacturing...

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