Main Data

• Description: tyre shaping and curing press double enveloping worm gear(globoidal worm gearing)
• GEARX No.: TPW203.2-1
• Center distance: 203.2 mm
• Ratio: 70/1
• Starts of worm: 1
• Number of teeth of worm gear: 70
• Transverse module(Mt): 4.8057 mm
• Pressure angle: 21.813°
• Helical angle: 3.927° Helical hand: Right
• Worm:
  • Material of worm: 42CrMo
  • Heat treatment: Through quenching and tempering, then nitriding
  • Tooth surface hardness: HV≥600
  • Nitriding depth(CHD): 0.4 mm
  • Tooth surface finish: Ground
  • Tip diameter: 90.6 mm
  • Reference diameter: 70 mm
  • Face width: 107.5 mm
  • Weight: 26 kg

• Worm gear
  
  • Material: ZQSn10-1
  • Tooth surface finish: Hobbing
  • Tip Diameter: 350 mm
  • Reference diameter: 336.4 mm
  • Face width: 63.5 mm
  • Weight: 35.1 kg

Application

• 40.5" Tyre curing press (NRM Brand)

The Main Fabrication Procedure

• 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

• Worm gear
  • Centrifugal casting
  • IRough turning
  • Semi-finish turning
  • Hobbing
  • Facing up

Technical Documents

• Inspection certificate of material
• Heat treatment certificate
• Certificate of ultrasonic inspection
• 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)