Heavy-Duty Cast Girth Gears for Kilns and Mills

Yile Machinery is a leading manufacturer of large-diameter cast girth gears, the essential component for driving heavy rotating systems. We engineer and produce robust, high-endurance gears for the world's most demanding applications, including cement kilns, grinding mills, and industrial dryers.

The Core of Your Rotating Equipment

The girth gear is the heart of any large rotary drum system. It is responsible for transmitting the primary drive torque to rotate the main vessel. The reliability of your entire production line depends on the integrity and precision of this critical component. Our gears are engineered for:

• Maximum Load Capacity: Designed to handle immense operational loads and torque.

• High Durability: Manufactured for exceptional resistance to wear and fatigue.

• Precision Meshing: Machined for smooth, efficient power transmission with the drive pinion, minimizing vibration and wear.

The Right Material for the Right Component

A successful gear system relies on selecting the optimal material for both the large girth gear and its smaller drive pinion.

• Girth Gear Material - High-Strength Cast Steel (e.g., ZG42CrMo):

For massive components like girth gears, we use high-quality cast alloy steels. ZG42CrMo is a proven material that offers an excellent combination of surface hardness (for wear resistance) and core toughness (to absorb shock loads). The casting is subjected to a normalizing or quenching & tempering heat treatment to optimize its mechanical properties for long service life.

• Drive Pinion Material - Premium Forged Steel (e.g., 34CrNiMo, 42CrMo):

The pinion operates at higher speeds and stress levels. For this component, we use superior forged, high-tensile alloy steels. Materials like 34CrNiMo provide exceptional strength, toughness, and fatigue resistance, ensuring it can withstand the relentless demands of driving the main gear.

Our Manufacturing Process: A Commitment to Quality

1. Modeling & Casting: We begin with advanced modeling and precise pattern-making. The gear is cast using quality-controlled alloy steel and advanced foundry techniques to ensure a defect-free casting.

2. Heat Treatment: The raw casting undergoes a crucial normalizing and tempering process in our large-capacity heat treatment furnaces to refine the steel's microstructure and achieve the desired mechanical properties.

3. Precision Machining & Gear Cutting: Using our heavy-duty vertical lathes and CNC gear hobbing machines, we machine all surfaces and cut the gear teeth to exact specifications for a perfect profile.

4. Rigorous Quality Assurance: Every girth gear is thoroughly inspected before shipment. Our QA protocol includes:

• Non-Destructive Testing (NDT): Ultrasonic (UT) and Magnetic Particle (MT) inspection to guarantee the casting is free from internal and surface flaws.

• Hardness Testing: To verify the success of the heat treatment process.

• Full Dimensional Inspection: To ensure it meets all drawing specifications.

Applications for Cast Girth Gears

Our gears are the driving force in a wide range of heavy industrial sectors:

• Cement & Lime Production (Rotary Kilns)

• Mining & Mineral Processing (Ball Mills, SAG Mills)

• Fertilizer Production (Granulators, Dryers)

• Pulp & Paper Industry

Request a Quote for a Complete Girth Gear Solution

Provide your technical drawings and operational requirements. Our engineering team will deliver a robust, reliable gear and pinion set designed for your specific application.