Roll Chocks for Rolling Mills | Precision Housings

Product Specifications

Technical details and manufacturing context for Roll Chocks

Definition

Roll chocks are precision-engineered housings that securely hold and position the work rolls within a heavy-duty rolling mill stand. They provide rigid support to withstand the extreme forces generated during metal rolling operations while maintaining precise roll alignment and gap control. As critical components of the mill stand assembly, they directly influence product quality, dimensional accuracy, and operational stability. Roll chocks are typically manufactured from forged alloy steel or cast steel, offering high strength and durability. They are designed to accommodate roll neck diameters ranging from 100 to 500 mm, with overall widths from 150 to 800 mm, and can support static loads up to 5000 kN. The operating pressure range is 1.0 to 1.6 MPa, and the operating temperature range is -20 to 80°C. Tolerance grades IT6 to IT7 ensure precise roll alignment, while surface roughness of 0.8 to 1.6 µm Ra is critical for sealing. Material grades such as ZG270-500 (cast steel) are specified for strength. The weight of roll chocks varies from 500 to 5000 kg, affecting handling and installation. These parameters are reference ranges and must be verified for specific models and applications. Roll chocks function by providing a stable mounting platform for roll bearings, transferring rolling forces to the mill housing, and allowing roll gap adjustment via screw-down mechanisms. They maintain roll parallelism and prevent deflection under load, ensuring consistent material thickness and surface quality. When selecting roll chocks, consider bore diameter matching the roll neck, overall width for mill stand spacing, load capacity, operating pressure, temperature, tolerance grade, surface roughness, material grade, and weight. Verification questions include confirming the exact dimensions, load ratings, and compliance with relevant standards such as ISO 286, ISO 76, ISO 1302, and GB/T 11352. Maintenance signals include excessive wear, misalignment, or seal degradation. Failure boundaries include exceeding load capacity or operating temperature limits. Always verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

Roll chocks function by providing a stable mounting platform for the roll bearings, which in turn support the rotating work rolls. They transfer rolling forces from the rolls to the mill housing while allowing for roll gap adjustment through screw-down mechanisms. The chocks maintain precise roll parallelism and prevent deflection under load, ensuring consistent material thickness and surface quality throughout the rolling process.

Common Materials

Forged alloy steel, Cast steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Bore Diameter	100–500 mm	Matches roll neck diameterISO 286
Overall Width	150–800 mm	Affects mill stand spacing
Load Capacity	500–5000 kN	Static load ratingISO 76
Operating Temperature	-20–80 °C	Above 80°C seals degrade
Tolerance Grade	IT6–IT7	Ensures roll alignmentISO 286
Surface Roughness	0.8–1.6 µm Ra	Critical for sealingISO 1302
Material Grade	ZG270-500	Cast steel for strengthGB/T 11352
Weight	500–5000 kg	Affects handling and installation

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Chock Body
Main structural frame that houses bearings and transfers loads

Material: Forged alloy steel
Bearing Housing Part
Precision-machined cavity for mounting roll bearings

Material: Hardened steel
Sealing System Part
Prevents lubricant leakage and contamination ingress

Material: Rubber/Synthetic seals
Cooling Channels Part
Internal passages for coolant circulation to manage heat

Material: Integrated into chock body
Mounting Flanges Part
Attachment points for connecting to mill housing and adjustment mechanisms

Material: Steel
Roll Bearings
The bearings the chock is built around; they carry the rolling load.

Manufacturers of Roll Chocks

Manufacturer profiles associated with Roll Chocks.

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Frequently Asked Questions

What are roll chocks used for?

Roll chocks are used to support and align work rolls in a rolling mill stand. They provide a stable mounting platform for roll bearings, transfer rolling forces to the mill housing, and allow for precise roll gap adjustment.

What materials are roll chocks made of?

Roll chocks are typically made from forged alloy steel or cast steel. The material grade, such as ZG270-500, is specified for strength and durability.

What parameters should be considered when selecting roll chocks?

Key parameters include bore diameter (matching roll neck), overall width, load capacity, operating pressure, operating temperature, tolerance grade, surface roughness, material grade, and weight. These must be verified for the specific application.

How do I verify the suitability of roll chocks for my mill?

Check the manufacturer's specifications for dimensions, load ratings, and compliance with standards such as ISO 286, ISO 76, ISO 1302, and GB/T 11352. Always confirm model-specific values with the legal manufacturer or supplier.

Data Basis

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Preliminary Technical Classification

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pressure:	Max 50 MPa (7,250 psi) static, 30 MPa (4,350 psi) dynamic
other spec:	Roll force capacity: 10,000-50,000 kN, alignment tolerance: ±0.05 mm
temperature:	Ambient to 150°C (302°F) continuous, peak 200°C (392°F) short-term

Roll Chocks

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