Rotary Kiln Heavy large Rolling Ring forging tyre

As a key supporting component of the rotary kiln shell, our rotary kiln tyre directly determines the operational stability of the equipment. It is suitable for heavy-duty kilns in industries such as cement, metallurgy, and chemical engineering, and is a core consumable to ensure continuous production.

The rotary kiln tyre transmits the entire gravity of the shell (including refractory bricks, internal devices, materials, etc.) to the supporting rollers, ensuring the shell can rotate smoothly on the supporting rollers; meanwhile, it enhances the radial stiffness of the shell. For casting, high-quality cast steel such as ZG45/ZG42CrMo is usually selected. Compared with the casting process, the forged tyre refines metal grains and densifies the structure through the forging process, which is superior in strength, toughness, and wear resistance, making it the preferred core component for ultra-large and heavy-duty rotary kilns.

Production Process

1.Forging

Electro-hydraulic hammers/quick forging machines (e.g., 10,000-ton forging equipment) are adopted. Forging steps (upsetting → drawing out → rounding → punching → hole expanding) are designed according to the rotary kiln tyre size, and metal grains are refined through multiple forgings.

2.Heat Treatment

Normalizing + quenching and tempering are applied. Normalizing refines the structure, and quenching and tempering (quenching + high-temperature tempering) enable the rotary kiln tyre to obtain comprehensive mechanical properties of “high strength + high toughness”, with the hardness uniformity controlled within HB±15.

3.Machining

Rough turning, semi-finish turning, and finish turning are performed. The surface finish of the outer circle and end face reaches Ra1.6, and the dimensional accuracy meets “national standards + industry customized standards”.

4.Inspection

In addition to conventional non-destructive testing (UT/MT), we use imported SPECTRO spectrometers from Germany to conduct chemical composition analysis and mechanical property tests (tensile and impact tests) on the products to verify the quality in all aspects. We also support third-party inspection.

5.Packaging and Delivery

Application Scenarios

• Metallurgy: Large-scale ferronickel rotary kilns, copper smelting rotary kilns (heavy load, high impact working conditions);
• Building Materials: 10,000-ton-per-day cement rotary kilns (scenarios with high stability requirements);
• Environmental Protection: Hazardous waste incineration rotary kilns (with additional requirements for high temperature resistance and corrosion resistance).

Advantages

• Excellent Mechanical Properties: Forged from high-strength alloy structural steels such as 42CrMo and 35CrMo, with a tensile strength of ≥800MPa, yield strength of ≥600MPa, and impact toughness increased by 40%, it can withstand extreme heavy loads and frequent alternating stresses.
• Controllable Dimensional Accuracy: The dimensional tolerance of the forging is controlled within ±0.2mm, and the fit clearance with the shell and supporting rollers is precise, reducing the vibration amplitude by 20% during operation and significantly improving equipment stability.
• Longer Wear-resistant Service Life: The surface hardness after forging reaches HB280-320, the wear resistance is 50% higher than that of cast tyres, and the service life exceeds 10,000 hours, making it suitable for high-impact working conditions in metallurgy, building materials, etc.