Main Data

• Description: Grinding mill girth gear
• GEARX No.: SG30-232RG
• Normal module: 30 mm
• No. of teeth: 232
• Pressure angle: 20°
• Helical angle: 13°
• Helical hand: Right
• Material: GB ZG45CrMo
• Heat treatment: Quenching and tempering
• Tooth hardness: HB270-320
• Tip Diameter: 7,061.935 mm
• Reference diameter: 7,031.935 mm
• Root diameter: 6,956.935 mm
• Face width: 800 mm
• Tooth surface finish: Ground
• Accuracy grade: DIN5
• Blank weight: 63,183 kg
• Weight: 30,591 kg

Application

• Grinding mills

The Main Fabrication Procedure

• Casting the girth gear blank.
• Rough machining
• Ultrasonic inspection
• Quenching and tempering to HB270-320
• Combining the 2 semi girth gear blank into a single entity.
• Turning the gear.
• Hobbing
• Dimensional (run out) and quality test of the hobbing
• Grinding
• Inspection magnetic inspection the tooth flank, and then magnet demagnetization
• Packaging and delivery to the customer

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

• ANSI/AGMA 6004-F88 Gear Power Rating for Cylindrical Grinding Mills, Kilns, Coolers and Dryers
• I SO 6336 Calculation of load capacity of spur and helical gears
• DIN 3990 Calculation of load capacity of cylindrical gears