Hydraulic Actuator Cylinder for Rolling Mill Gap Control

Product Specifications

Technical details and manufacturing context for Hydraulic Actuator Cylinder

Definition

The hydraulic actuator cylinder is a critical component within the Heavy-Duty Rolling Mill Hydraulic Gap Control System. It is responsible for the precise, high-force linear positioning of the work rolls. The cylinder directly translates hydraulic pressure from the system's servo valves into controlled mechanical movement, enabling real-time adjustment of the gap between rolls to achieve the desired material thickness and profile during the metal rolling process. This component is designed for the demanding environment of basic metal manufacturing, where consistent and accurate roll gap control is essential for product quality and operational efficiency. The cylinder's construction typically includes a high-strength alloy steel barrel and piston rod, with ductile iron or forged steel for the piston and end caps. Wear rings and bearing strips are often made of bronze or composite materials, while specialized elastomers are used for seals and wipers to ensure reliable operation. Key parameters include a bore diameter range of 50–320 mm, stroke length from 100–2000 mm, and operating pressure of 16–35 MPa, resulting in a force output of 31–2815 kN. Positioning accuracy is ±0.05 mm, and the operating temperature range is -20 to 80 °C. The cylinder offers ingress protection ratings of IP65–IP67. Materials specified include 45# carbon steel for the cylinder and 40Cr for the piston rod, with NBR seals (optional FKM for high temperatures). Weight varies from 15 to 1500 kg depending on configuration. These specifications are reference values and must be verified with the manufacturer for specific models and applications. The cylinder operates on the principle that hydraulic fluid under high pressure, controlled by servo valves, acts on the piston area to generate linear force (Force = Pressure × Area). Position feedback from transducers enables closed-loop control with micron-level precision. For procurement, it is essential to confirm bore, stroke, pressure, mounting style, and environmental requirements with the supplier.

Working Principle

Hydraulic fluid under high pressure, controlled by servo valves, is directed into the cylinder's chamber(s). This pressure acts upon the piston's surface area, generating a linear force (Force = Pressure × Area). The piston rod extends or retracts, moving the attached roll housing or chock to adjust the gap. Position feedback from transducers allows the system's controller to achieve closed-loop, micron-level precision.

Common Materials

High-strength alloy steel (cylinder barrel, piston rod), Ductile iron or forged steel (piston, end caps), Bronze or composite materials (wear rings, bearing strips), Specialized elastomers (seals, wipers)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Bore Diameter	50–320 mm	Determines force output; larger bore for higher force.ISO 6020-2
Stroke Length	100–2000 mm	Custom strokes available; affects overall dimensions.ISO 6020-2
Operating Pressure	16–35 MPa	Higher pressure increases force but requires thicker walls.ISO 6020-2
Force Output	31–2815 kN	Calculated from pressure and bore; match to mill requirements.
Positioning Accuracy	±0.05 mm	Critical for roll gap control; requires feedback sensor.
Operating Temperature	-20–80 °C	Seals and fluid viscosity limit range.
Ingress Protection	IP65–IP67	Protects against dust and water jets; higher for washdown.IEC 60529
Cylinder Material	45#	Carbon steel; optional stainless for corrosive environments.GB/T 699
Piston Rod Material	40Cr	Hard chrome plated for wear resistance.GB/T 3077
Seal Material	NBR	Nitrile rubber; optional FKM for high temperature.ISO 1629
Weight	15–1500 kg	Depends on bore, stroke, and mounting style.

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
Forms the pressure vessel containing the piston and hydraulic fluid; provides mounting interface.

Material: High-strength honed alloy steel tube
Piston Assembly
Seals the pressure chambers and transmits force from fluid pressure to the rod.

Material: Forged steel or ductile iron with bronze wear rings
Piston Rod Part
Transmits the linear force from the piston to the external load (roll chock).

Material: Hard-chrome plated high-tensile alloy steel
Seal Kit Part
Prevents internal and external leakage of hydraulic fluid and contaminants.

Material: Polyurethane, Nitrile, or Fluorocarbon elastomers
Position Transducer
Measures the real-time position of the piston rod for closed-loop feedback control.

Material: Stainless steel housing with electronic components

Manufacturers of Hydraulic Actuator Cylinder

Manufacturer profiles associated with Hydraulic Actuator Cylinder.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 6 September 2026

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Frequently Asked Questions

What is the primary function of this hydraulic actuator cylinder?

It converts hydraulic pressure into linear mechanical force to precisely position the work rolls in a rolling mill, controlling the roll gap for accurate material thickness and profile.

What are the typical bore and stroke ranges?

The bore diameter ranges from 50 to 320 mm, and the stroke length from 100 to 2000 mm, per ISO 6020-2. Custom strokes may be available.

What materials are used in construction?

The cylinder barrel and piston rod are high-strength alloy steel, with ductile iron or forged steel for piston and end caps. Wear rings are bronze or composite, and seals are specialized elastomers.

How is positioning accuracy achieved?

Position feedback from transducers enables closed-loop control, achieving accuracy of ±0.05 mm. The system adjusts hydraulic pressure via servo valves to maintain the desired roll gap.

Data Basis

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Preliminary Technical Classification

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pressure:	Up to 350 bar (5000 psi)
flow rate:	Up to 200 L/min
temperature:	-20°C to +120°C
slurry concentration:	Not applicable - clean hydraulic oil required

Hydraulic Actuator Cylinder

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