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)