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products

Main Data

  • Description: 12 starts double enveloping worm gear set
    • GEARX No.: TPW600-3.9167-12
    • Center distance: 600 mm
    • Ratio: 3.9167 (47/12) 
    • Starts of worm: 12
    • Number of teeth of worm gear: 47 
    • Transverse module(Mt): 20 mm 
    • Pressure angle: 29.7°
    • Helical angle: 43°
    • Helical hand: Right
  • Double enveloping worm
    •  Material of worm: 42CrMo
    • Heat treatment: Through quenching and tempering, then nitriding.
    • Tooth surface hardness: HV≥600
    • Nitriding depth (CHD): 0.5 mm
    • Tooth surface finish: Ground
    • Tip diameter: 288 mm
    • Reference diameter: 260 mm
    • Face width: 220 mm
    • Weight of gear blank: 850 kg
    • Weight: 600 kg
  • Double enveloping worm gear 
    • Material: ZCuAl10Ni6Fe5
    • Tooth surface finish: Hobbing
    • Tip Diameter: 968 mm 
    • Reference diameter: 940 mm
    • Face width: 176 mm
    • Weight of gear blank: 480 kg
    • Weight: 300 kg

Application

  • Roiling mill screw down

The Main Fabrication Procedure

  • Double enveloping worm  
    • Forging the gear blank
    • Normalizing
    • Rough turning
    • Ultrasonic inspection
    • Quenching and tempering
    • Semi-finish turning
    • Aging treatment
    • Coarse grinding the external and ends
    • Turning tooth threads
    • Semi-finish grinding tooth
    • Nitriding
    • Finish grinding the external and ends
    • Gear grinding
    • Inspection magnetic inspection the tooth flank, and then magnet demagnetization
    • Facing up
  • Double enveloping worm gear 
    • Centrifugal casting
    • Rough turning
    • Semi-finish turning
    • Hobbing
    • Facing up

Technical Documents

  • Inspection certificate of material
  • Heat treatment certificate
  • Certificate of ultrasonic inspection with grade II
  • Magnetic particle detection certificate(on tooth flank)
  • Size tolerance and geometric tolerance report
  • Inspection report of tooth quality

Relative Standards

  • GB/T16445-1996 Planar double-enveloping worm gear accuracy
  • ANSI/AGMA 6035-A02 American National Standard Design, Rating and Application of Industrial Globoidal Wormgearing (Metric Edition)