Hydraulic Cylinder Assembly for Rolling Mills | Specifications & Verification

Product Specifications

Technical details and manufacturing context for Hydraulic Cylinder Assembly

Definition

The Hydraulic Cylinder Assembly is a component used in heavy-duty rolling mill hydraulic screwdown systems. Its primary function is to apply and maintain the precise rolling force required to reduce the thickness of metal slabs or plates. By directly controlling the gap between work rolls, it ensures consistent product thickness and quality. The assembly operates by directing high-pressure hydraulic fluid into the cylinder chamber, acting on a piston to create linear force that extends or retracts the piston rod. This force is transmitted to the screwdown mechanism to adjust the roll gap. A servo-valve system precisely controls fluid flow and pressure for accurate positioning and force control. The cylinder is manufactured from high-strength alloy steel, with a chrome-plated piston rod, bronze or composite bearings, and nitrile or polyurethane seals. Key parameters include bore diameter (40–200 mm, ISO 6020-2), stroke length (50–2000 mm), operating pressure (1.0–16 MPa), piston rod diameter (20–100 mm, ISO 6020-2), maximum pull force (12–500 kN), maximum push force (15–600 kN), operating temperature (-20 to 80°C, ISO 5597), sealing type (NBR/PU, ISO 5597), cushioning type (adjustable), mounting style (flange/clevis, ISO 6020-2), port size (G1/4–G1, ISO 228-1), and weight (5–150 kg). These values are reference ranges and must be verified for the specific model and application. The assembly is designed for integration into existing machinery, and its selection requires consideration of force requirements, stroke, mounting interface, and environmental conditions. Verification of model-specific values and standards with the legal manufacturer or supplier is essential before procurement.

Working Principle

High-pressure hydraulic fluid is directed into the cylinder chamber, acting on the piston. This pressure creates a linear force that extends or retracts the piston rod. The force is transmitted to the screwdown mechanism to adjust the roll gap. A servo-valve system precisely controls the fluid flow and pressure for accurate positioning and force control.

Common Materials

High-strength alloy steel, Chrome-plated piston rod steel, Bronze or composite bearing materials, Nitrile or polyurethane seals

Technical Parameters

Parameter	Typical range	Notes & selection driver
Bore Diameter	40–200 mm	Determines force outputISO 6020-2
Stroke Length	50–2000 mm	Custom lengths available
Piston Rod Diameter	20–100 mm	Affects buckling strengthISO 6020-2
Maximum Pull Force	12–500 kN	Calculated from bore and pressure
Maximum Push Force	15–600 kN	Calculated from bore and pressure
Operating Temperature	-20–80 °C	Seals degrade outside rangeISO 5597
Sealing Type	NBR/PU	NBR for oil, PU for waterISO 5597
Cushioning Type	Adjustable	Reduces end-of-stroke impact
Mounting Style	Flange/Clevis	Must match machine interfaceISO 6020-2
Port Size	G1/4–G1 inch	Affects flow rateISO 228-1
Weight	5–150 kg	Depends on bore and stroke

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

Cylinder Barrel Part
Forms the pressure chamber and guides the piston. Houses the hydraulic fluid.

Material: High-strength alloy steel
Piston Part
Seals the pressure chamber and converts hydraulic pressure into linear force.

Material: Alloy steel with wear-resistant seals
Piston Rod Part
Transmits the linear force from the piston to the external screwdown mechanism.

Material: Hardened and chrome-plated steel
Rod Gland / End Cap
Seals the rod exit point, contains bearings, and prevents fluid leakage.

Material: Alloy steel with integrated seal housing
Seal Kit Part
Provides dynamic and static sealing to contain hydraulic fluid and prevent contamination.

Material: Nitrile rubber, Polyurethane, PTFE

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Roll Gap Adjustment System

View system integration details

Manufacturers of Hydraulic Cylinder Assembly

Manufacturer profiles associated with Hydraulic Cylinder Assembly.

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Frequently Asked Questions

What is the primary function of this hydraulic cylinder assembly?

It converts hydraulic pressure into linear mechanical force to precisely control the roll gap in a rolling mill, ensuring consistent product thickness.

What materials are used in its construction?

High-strength alloy steel for the cylinder, chrome-plated steel for the piston rod, bronze or composite bearings, and nitrile or polyurethane seals.

What are the key parameters to consider when selecting this cylinder?

Bore diameter, stroke length, operating pressure, piston rod diameter, force ratings, temperature range, sealing type, mounting style, port size, and weight. These must be matched to the application.

How should I verify that this cylinder meets my requirements?

Check the model-specific datasheet from the manufacturer or supplier, and confirm that the parameters and standards (e.g., ISO 6020-2) align with your system's needs.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 300 bar (4350 psi)
flow rate:	Up to 100 L/min (26.4 GPM)
temperature:	-20°C to +80°C
slurry concentration:	Not recommended for slurry applications

Hydraulic Cylinder Assembly

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards