Main Data

• Description:
  • Heavy plate mill ZC-worm gear set
  • Module: 17 mm
  • Helical angle: 33°36’11”
  • Helical hand: Right
• Heavy plate mills ZC-worm
  • GEARX No.: SW17-1RG
  • Module: 17 mm
  • No. of starts: 1
  • Helical angle: 33°36’11”
  • Helical hand: Right
  • Material: 20CrMnMo
  • Heat treatment: Through quenching and tempering, then carburizing hardened
  • Tooth hardness: HRC48-52
  • Case hardening depth(CHD): 1.5 mm
  • Tip Diameter: 289 mm
  • Reference diameter: 255 mm
  • Root diameter: 212.5 mm
  • Face width: 400 mm
  • Tooth surface finish: Ground
  • Accuracy grade: ISO 6
  • Weight of gear blank: 592 kg
  • Weight: 348 kg
• Heavy plate mill ZC-worm gear
  • GEARX No.: BWG17-64R
  • Module: 17 mm
  • No. of teeth: 64
  • Helical angle: 33°36’11”
  • Helical hand: Right
  • Material:
  • Centrifugal casting bronze ZQSn10-1
  • Tip Diameter: 1139 mm
  • Reference diameter: 1105 mm
  • Root diameter: 1062.5 mm
  • Face width: 835 mm
  • Tooth surface finish: Hobbing
  • Accuracy grade: ISO 6
  • Weight of gear blank: 5700 kg
  • Weight: 3845 k

Application

• Heavy plate mills

The Main Fabrication Procedure

• Heavy plate mill ZC-worm
  • Forging the gear blank
  • Normalizing
  • Rough machining
  • Ultrasonic inspection, analyzing the chemical composition
  • Quenching and tempering
  • Semi-finish turning
  • Rough grinding the external and ends
  • Rough notch
  • Rough gear grinding
  • Carburizing and quenching
  • Finish grinding the external and ends
  • Gear grinding
  • Inspection magnetic inspection the tooth flank, then magnet demagnetization
• Heavy plate mill ZC-worm gear
  • Centrifugal casting the gear blank
  • Rough machining
  • Semi-finish turning
  • Finish turning
  • Hobbing

Technical Documents

• Heavy plate mill ZC-worm
  • Inspection certificate of material
  • Heat treatment certificate
  • Certificate of ultrasonic inspection
  • Magnetoscopic test certificate(on tooth flank)
  • Size tolerance and geometric tolerance report
  • Inspection report of tooth quality
• Heavy plate mill ZC-worm gear
  • Inspection certificate of material
  • Size tolerance and geometric tolerance report
  • Inspection report of tooth quality

Relative Standards

• ISO/TR 10828:1997(E) Worm gears - Geometry of worm profiles
• ISO 1122-1:1998 Vocabulary of gear terms - Part 1 Definitions related to geometry
• ISO 1122-2:1999(E/F) Vocabulary of gear terms - Part 2: Definitions related to worm gear geometry
• ISO/TR 14521:2010 Gears -- Calculation of load capacity of wormgears