me0203 manufacturing...
TRANSCRIPT
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ME0203 Manufacturing Technology
Gear cutting ch04
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Involute Spur Gear
Figure 24.29 Nomenclature for an involute spur gear.
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Gear cutting methods:
(a) Casting • Sand casting
Die castingInvestment casting
(b) Stamping.(c) Powder metallurgy.(d) Extruding.(e) Plastic molding.(f) Rolling.(g) Machining
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• Form cutter in milling machine. Form cutter in broaching machine.Form cutter in shaper
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Form cutting in milling machine
A - Foot Stock D - Mandrel
B - Form Cutter E - Index Plate C - Tooth Depth F - Workable for Milling Machine
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Gear shaping
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Gear Generating with Various
Cutters
Figure 24.30 (a) Producing gear teeth on a blank by form cutting. (b) Schematic illustration of gear generating with a pinion-shaped gear cutter. (c) and (d) Gear generating on a gear shaper using a pinion-shaped cutter. Note that the cutter reciprocates vertically. (e) Gear generating with rack-shaped cutter. Source: (d) Schafer Gear Works, Inc.
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Hobbing
Figure 24.31 (a) Schematic illustration of gear cutting with a hob. (b) Production of worm gear through hobbing. Source: Courtesy of Schafer Gear Works, Inc.
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Bevel Gears
Figure 24.32 (a) Cutting a straight bevel-gear blank with two cutter. (b) Cutting a helical bevel gear. Source: Courtesy of Schafer Gear Works, Inc.
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Methods of Gear Finishing
(a) Gear shaving(b) Gear grinding(c) Gear burnishing(d) Gear lapping(e) Gear honing(f) Gear tooth rounding
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Finishing Gears by Grinding
Figure 24.33 Finishing gears by grinding: (a) form grinding with shaped grinding wheels; (b) grinding by generating with two wheels.
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Gear Manufacturing Cost as a Function of Gear Quantity
Figure 24.34 Gear manufacturing cost as a function of gear quality. The numbers along the vertical lines indicate tolerances.