Cast Steel Girth Gears for Ball Mills, SAG Mills, and Rotary Kilns
Product Description
As the primary drive component for your grinding mills and rotary kilns, the girth gear is the heart of your operation. Yile Machinery specializes in the engineering and manufacturing of large-scale, cast steel girth gears designed for unmatched durability and reliability. We provide critical replacement gears that meet or exceed OEM specifications, helping you minimize costly downtime and restore your plant's productivity.
The Foundation of Durability: Superior Casting & Heat Treatment
The service life of a girth gear is determined by the quality of its casting. We use advanced simulation software and a tightly controlled process to produce castings with exceptional integrity.
High-Quality Cast Steel: We utilize robust steel alloys like ZG45 and ZG42CrMo, known for their high strength and wear resistance.
Optimized Heat Treatment: Each gear casting undergoes a unique heat treatment process (such as normalizing and tempering) in our large-scale furnaces. This refines the internal microstructure, providing the perfect balance of high surface hardness for wear resistance and core toughness to withstand heavy shock loads.
Rigorous Quality Control: All castings are subject to extensive Non-Destructive Testing (NDT) , including Magnetic Particle Inspection (MPI) and Ultrasonic Testing (UT) , to guarantee they are 100% free of any internal or surface defects.
Precision Machining for a Perfect Drive System
After casting and heat treatment, the gear is finished with extreme precision on our large-capacity machine tools.
Massive CNC Machining: The gear segments are machined on our large CNC Vertical Turret Lathes (VTLs) to ensure perfect roundness and flatness.
Advanced Gear Cutting: Using specialized CNC gear hobbing or milling machines, we cut the gear teeth with exceptional accuracy. This precision ensures a smooth, efficient power transmission, reducing vibration, noise, and wear on both the girth gear and the drive pinion.
Split Gear Design: The Solution for Efficient Installation
Due to their immense size, girth gears are manufactured in two, four, or more segments (Split Gear) . This design is critical for transportation and, most importantly, for installation. It allows the gear to be fitted around the mill or kiln body on-site, dramatically reducing shutdown time and installation complexity. The mating faces of each segment are precision-machined to ensure a rigid and seamless assembly.
Emergency Service: Reverse Engineering Your Worn or Failed Girth Gear
When original drawings are unavailable, we are your solution.
In a breakdown situation, our reverse engineering team can act quickly. We can use on-site 3D scanning or your existing worn/broken gear segments to create a complete set of manufacturing drawings. We will analyze the material, replicate the exact dimensions, and produce a new girth gear that fits flawlessly into your existing drive train.
Get Your Mill Running Again – Request a Quote
Whether you have full technical drawings or a broken segment on the ground, our team is ready to help. Contact us to manufacture the replacement girth gear you need to get back to full production.