Hot Rolling Mill Intermediate Roll Bearing Chock

The Intermediate Roll Bearing Chock in a hot rolling mill is an important component of the hot rolling production line. It is mainly used to support and secure the intermediate roll and maintain accurate and stable roll positioning during rolling operations. The Bearing Chock needs to withstand high rolling forces, repeated impact loads, and heat transferred from the hot rolling process. It must also maintain reliable performance in environments containing cooling water, moisture, dust, and iron oxide scale.

Application Scenarios of Intermediate Roll Bearing Chock in Hot Rolling Mill

The Intermediate Roll Bearing Chock is mainly used in hot rolling production lines operating under high-temperature and heavy-load conditions. During the hot rolling process, the surrounding temperature of the rolling mill can exceed 800 °C. The Bearing Chock is therefore exposed to both radiant heat and conducted heat and needs to maintain stable mechanical properties and dimensional accuracy during operation.

The Bearing Chock must also withstand high rolling forces, which can reach thousands of tons depending on the rolling mill configuration, together with frequent impact loads. At the same time, rolling cooling water and iron oxide scale may enter exposed areas of the equipment. Therefore, suitable sealing and corrosion-resistant protection are important for maintaining the operating condition and service life of the Intermediate Roll Bearing Chock.

Functional Requirements

Accurate positioning:
The Intermediate Roll Bearing Chock needs to provide accurate support and positioning for the intermediate roll. Proper positioning helps maintain roll parallelism and rolling accuracy and contributes to the stable operation of the hot rolling mill.

Wear and fatigue resistance:
The Bearing Chock operates under repeated mechanical loads and continuous working conditions. Suitable material selection, heat treatment, precision machining, and process control help improve wear resistance and fatigue resistance, extend service life, and reduce maintenance downtime.

Lubrication:
A reliable lubrication system is required to reduce friction and wear between the bearing and mating components. According to the equipment configuration, a high-pressure lubrication system such as oil-air lubrication can be used to provide suitable lubrication during operation.

Heat Treatment Process of Intermediate Roll Bearing Chock

Heat Treatment is an important manufacturing process for improving the mechanical properties and dimensional stability of the Intermediate Roll Bearing Chock. The specific treatment method is selected according to the material, structure, operating load, and technical requirements.

Pre-treatment — Normalizing or Annealing:
Normalizing or annealing can be used to reduce internal stress in castings or forgings, refine the grain structure, and prepare the material for subsequent machining and heat treatment.

Quenching and Tempering:
When required by the material specification, the Bearing Chock can undergo quenching and tempering. Quenching may involve heating to a critical temperature such as 850-900 °C, followed by rapid cooling using water or oil to obtain the required hardened structure. Medium-temperature tempering at approximately 400-600 °C can then be used to balance hardness and toughness and reduce the risk of brittle fracture.

Surface Strengthening:
Surface strengthening can be applied to selected bearing contact surfaces according to the product requirements. Induction hardening can improve local surface hardness and wear resistance. Carburizing or nitriding may be considered for suitable alloy steel materials where higher surface hardness and fatigue resistance are required.

Stress-Relief Annealing:
After precision machining, low-temperature annealing at approximately 200-300 °C can be used to reduce machining stress and improve dimensional stability.

GW Precision Manufacturing and Quality Control

GW Precision manufactures Intermediate Roll Bearing Chocks and other precision parts for rolling mill equipment. The company uses high-precision intelligent CNC manufacturing equipment, experienced technical personnel, mature processing systems, strict quality inspection procedures, and controlled production management processes to support the manufacturing quality of the Bearing Chock.

In addition to regular dimensional inspection, GW Precision has equipped its production facility with a high-precision mobile bridge-type coordinate measuring machine. The measuring accuracy can reach the 2-micron level, providing a reliable inspection basis for critical dimensions and geometric tolerance inspection.

Through CNC machining, Heat Treatment, process inspection, and precision measurement, the manufacturing process of the Intermediate Roll Bearing Chock can be controlled according to the required technical specifications. Critical dimensions, geometric tolerances, and other quality requirements can be inspected before final delivery to ensure consistent product quality.