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Large 12-Starts Double Enveloping Worm Gear Set

Development of Large 12-Starts Double Enveloping Worm Gear Set

Based on the existing experience in design and manufacture of the double enveloping worm gear set with worm starts Z1 max=8, speed ratio i=5 = 5, center distance a=500, the possibility of designing and manufacturing double enveloping worm gear set with number of starts z1 = 12, number of worm gears z2 = 47, center distance a = 600, is attempted. The worm pair which meets the requirements of customers

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Gear Heat Treatment

Full Annealing

Full annealing consists of heating steel or other ferrous alloys to 1475-1650_F (802-899_C) and furnace cooling to a prescribed temperature, generally below 600_F (316_C). This treatment forms coarse lamellar pearlite, the best microstructure for machinability of low andmedium carbon steels. Unless otherwise stated, annealing is assumed to mean full annealing.

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Ferrous Gearing

Ferrous Gearing

Ferrous materials for gearing include carbon and alloy wrought and cast steels, cast iron and ductile irons. Gearing of alloy and carbon steel is manufactured from different forms of rough stock depending upon service, size, design, quantity, availability, and economic considerations. These forms include wrought steel, weld fabrications and castings.

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Copper Base Gearing

Copper Base Gearing

Non-ferrous gears are made from alloys of copper, aluminum, and zinc. Alloys of copper are in wide use for power transmission gearing. Most of these are used in worm gearing where the reduced coefficient of friction between dissimilar materials and increased malleability are desired.

  • Gear Bronzes. A family of four bronzes accounts for most of the nonferrous gear materials, mainly because of their “wear resistance”

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