Custom 35CrMo Ball mill Casting Segment Girth Gear

girth gear is a large ring-shaped gear with straight or helical teeth, widely used in heavy-duty rotating equipment such as rotary kilns, ball mills, and dryers. It transmits torque by meshing with a pinion gear, driving the main drum to rotate steadily. As a core part of the transmission system, girth gears are typically made from high-strength alloy steel and undergo precision machining and heat treatment to ensure durability and reliability. Designed for high-load, high-temperature, and dusty environments, they demand excellent material quality, precise engineering, and accurate installation.

一. Company instruction

– 40+ years prodcution experience

– 2 factories and 5 workshops

-50+ Sets of equipment ( Including 6 sets of well-type elecric furnaces)

– 40+ patments

– 50+ countries and regions

二. Production Description for girth gear

We can produce casting/forging/segment girth gears. (2/4/6/8/12 segments, etc)

Module	8-120
Material	Cabon steel,Alloy steel
Gear profile	Spur gear/Helical gear
Structure	Forging/Casting/Forging+Welding
Grade	6-9
Diameter	Max. 16 meters (Integrated whole circle)

Used in rotary kilns, ball mills and dragline excavators

三．Production process for girth gear

1.Make inspection model, modeling

2.Casting

After casting, keep the heat, clean the sand, cut the riser, and check the appearance dimensions.The castings were annealed to remove the stress and cooled to room temperature.

Surface polishing, shot blasting, check for casting defects, if any, according to the repair standards

3.Rough machining & UT

Roughing all finished surfaces and reserving heat treatment allowance according to the drawing process

4.heat treatment

We will choose the heat treatment method according to the product characteristics

5. Semi-finished maching,matching and closing

6. Hobbing

Carring out the hobbing to the girth gear

7.Finished -machining,matching and closing

Finished machining according to the drawing, matching and closing

8.Rust proof, spray paint and packaging

四. FAQs

• What kind of packing do you have? –Our packing is suitable for export, usually plywood cases.
• Can you issue the drawings?–We can according to customer’s parameters to issue the drawings.
• Do you accept third party inspection?–Yes.
• What’s your payment terms?–T/T & L/C
• What’s your ship method?– By sea. By rail. By air.

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