Main Data

• Description: Cement mill spiral bevel gear
  • GEARX No.: SB27-61RG
  • Module: 27 mm
  • No. of teeth: 61
  • Pressure angle: 20°
  • Helical angle: 35°
  • Helical hand: Right
  • Gear tooth system: Gleason
  • Material: 17CrNiMo6
  • Heat treatment: Through quenching and tempering, then carburizing hardened
  • Case hardening depth(CHD): 3.50 mm
  • Tooth hardness: HRC59~63
  • Tip Diameter: 1630 mm
  • Face width: 210 mm
  • Tooth surface finish: Ground
  • Accuracy grade: DIN 6
  • Weight: 378.9 kg

Application

• Cement mill

The Main Fabrication Procedure

• Forging the gear blank.
• Normalizing
• Rough machining
• Ultrasonic inspection, analyzing the chemical composition and testing the mechanical property of sample
• Quenching and tempering
• Grinding datum plane
• Milling
• Carburizing and tempering
• Turning the the carbon layer
• Hardening and tempering( 2 times)
• Shot peening
• Finish turning
• Finish grinding
• Gear grinding
• Inspection magnetic inspection the tooth flank, and then magnet demagnetization
• Mating

Technical Documents

• 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
• Tooth contact pattern report

Relative Standards

• DIN 3965 Pt 1 08.86 - Tolerancing of bevel gears - Basic concepts
• DIN 3965 Pt 2 08.86 - Tolerancing of bevel gears - Tolerances for individual parameters
• DIN 3965 Pt 3 08.86 - Tolerancing of bevel gears - Tolerances for tangential composite errors
• DIN 3965 Pt 4 08.86 - Tolerancing of bevel gears - Tolerances for shaft angle errors and axes intersection
• DIN 3971 07.80 - Definitions and parameters for bevel gears and bevel gear pairs