Forged & Machined Segments for Large Diameter Slewing Rings

For massive equipment like mining shovels, draglines, and large-scale cranes, a single-piece slewing ring is often too large to forge, transport, or install. The solution is a segmented slewing ring—a high-precision assembly of multiple forged gear segments that form a complete, large-diameter track for the machine's rotation.

Yile Machinery is a specialist in manufacturing these critical, heavy-duty ring gear segments, engineered for maximum load capacity and service life in the world's most demanding applications.

Manufacturing Process for Unmatched Strength & Precision

The reliability of a multi-million dollar piece of equipment depends on the integrity of each slewing ring segment. Our manufacturing process is focused on delivering superior mechanical properties and perfect interchangeability.

1. Open-Die Forging: Each segment begins as a high-quality alloy steel ingot, which is forged to shape. The forging process refines the steel's grain structure, eliminating internal defects and creating a component with exceptional strength and resistance to impact and fatigue.

2. Quenching & Tempering: After forging, the entire segment undergoes a full-body heat treatment process (quenching and tempering) to establish the core strength, toughness, and durability required to handle immense operational loads.

3. Precision Gear Machining: Using large-format CNC milling and gear hobbing machines, we cut the gear teeth to precise specifications, ensuring a smooth, accurate mesh with the drive pinions. Mounting holes and mating faces are also machined to tight tolerances for a seamless assembly.

4. Gear Tooth Induction Hardening: This is the most critical step for wear life. The gear teeth surfaces are selectively hardened using an induction heating process, followed by a controlled quench. This creates an extremely hard, wear-resistant surface on the teeth while maintaining the toughness of the gear's core.

Materials & Quality Assurance

• High-Strength Alloy Steels: We typically utilize robust CrMo alloy steels such as 42CrMo (AISI 4140) for our gear segments, a material renowned for its excellent balance of strength, toughness, and hardenability.

• Rigorous Inspection: Every segment is subjected to a strict quality control regimen, including:

• Dimensional verification with CMM or laser trackers.

• Non-Destructive Testing (NDT) such as Ultrasonic Testing (UT) and Magnetic Particle Testing (MT) to guarantee freedom from sub-surface flaws.

• Hardness testing to verify the heat treatment results.

Applications for Heavy Rotating Machinery

Our segmented slewing rings are the foundation for rotation in a wide range of heavy equipment:

• Electric Mining Shovels & Hydraulic Excavators

• Walking Draglines

• Stacker-Reclaimers and Bucket-Wheel Excavators

• Ship-to-Shore (STS) Cranes and Large Gantry Cranes

• Tunnel Boring Machines (TBMs)

• Large Radar and Antenna Installations

Build Your Foundation for Reliable Rotation

Partner with an expert in large gear segment manufacturing. Contact us with your technical drawings, material specifications, and quantity requirements to get a detailed quote for your project.