GS42CrMo4 Alloy Cast Steel Mill Girth Gear Ring Gear For Mining Mill

GS42CrMo4 Alloy Cast Steel Mill Girth Gear Ring Gear For Mining Mill

1. Introduction of large ring gear of  Mill Girth Gear
Because of the large gear ring modulus and large diameter, the machined gear ring of the Great Wall adopts the spoke plate structure, which is composed of two and a half gear rings.The big gear ring is the main driving part of the rotary kiln, mill and other equipment. The pinion is driven by the motor, and the pinion is driven by the big gear mounted on the barrel, so that the mill is driven, and the big gear is closed with the barrel.

2. Product parameters of big ring for mill girth gear

3. Technical requirements of large gear ring for mill girth gear

(1) The surface pretreatment before quenching is normalized, and the hardness should be HB210~250; Mechanical properties are strength limit Rb690MPa, yield limit Rs490MPa, elongation d511%, area reduction w25%, impact toughness value Ak30J. Tooth induction hardening, hardness of HRC50~55; Effective hardening depth 3~5mm.

(2) Ultrasonic inspection shall be carried out on the whole, and the internal quality shall meet the secondary requirements stipulated in GB7233-87 standard; Gear tooth and transition fillet magnetic particle inspection, quality should meet GB/T9444-88 standard requirements.

(3) Uncast rounded corners R5~R10.

(4) Chamfering of both ends and edges along the tooth width. Big gear ring by two half gear ring connected with high strength bolts into a whole gear ring, the joint surface must be in the center of the tooth bottom.

mill girth gear