Mill Girth Gear Cast Iron Custom Large Diameter Ring Gear Rotary

Mill Girth Gear Cast Iron Custom Large Diameter Ring Gear Rotary Large Girth Gear

1. 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.

2. Product parameters of big ring for mill girth gear

3. Manufacturing process of big tooth ring for mill girth gear

(1) Blank

The steel casting blank is provided by the heavy casting and forging Plant of CITIC Heavy Industry Machinery Co., LTD. It is implemented in accordance with gb11352-89 standard. Molding, smelting, pouring, box beating, cleaning and dressing castings according to casting process requirements; During the inspection and acceptance, the cast steel blank shall be checked according to the drawings and technical requirements, and the process shall be put down after passing the acceptance according to JB/T6402-92 standard.

(2) Rough machining

Draw lines according to the requirements of the drawings and set aside processing allowance, alignment, connection, processing inner and outer circle, milling joint surface, drilling and other processes.

(3) Agent injury

Ultrasonic inspection shall be carried out on the whole, and the internal quality shall meet the secondary requirements of GB7233-87 standard.

(4) Normalizing pretreatment

The half ring is normalized and tempered in pairs to provide good microstructure for subsequent surface quenching. And according to the requirements of the drawings to check the deformation of half gear ring after heat treatment.

4. Case introduction of large ring gear

Citic Pacific's SINO iron project in Australia, the world's largest 7.9 x 13.6 m ball mill first big gear ring recently in a casting casting factory citic juki company success Sand production line. With a diameter of 12 meters and the height of a four-story building when broken, the size of the blank is the largest ever produced by Citic Heavy Machinery Company. At the same time, the casting also refreshed with the invention of the company and even heavy machinery industry records. First, 375 tons of molten steel was used, and second, 6 furnaces and 5 cladding casting were used to achieve this, breaking the company's record of 346 tons of molten steel set in 2007 by Saudi "Kiln King" wheel. Third, the quality scale requested for the company's similar products ever high. SINO Iron Mine is the world's largest mine project invested by CITIC Pacific in Australia together with steel groups such as Wuhan Iron and Steel Co., LTD. Citic heavy machinery for the development of the world's most progress, the specifications of the largest 5 group 1 (2) x 11 meters from the mill and 7.9 x 13.6 meters of ball mill, and will it as a "zero project".

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Mill Girth Gear Cast Iron Custom Large Diameter Ring Gear Rotary Images