Aluminum strip rolling mill cast steel sleeve (dynamic balance inspection)
The Aluminum Strip Rolling Mill Cast Steel Sleeve is designed for high-speed aluminum strip and foil rolling applications with rolling speeds of 1200–2500 m/min and material thicknesses of 0.1–2.0 mm. Made from 35NiCrMo steel, the sleeve has a specification of 565 × 505 × 1700 mm. It is suitable for four-high and six-high cold rolling mills and 20-high Sendzimir rolling mills used for battery foil and packaging foil. The sleeve is designed for dynamic stability at high rotational speeds, with residual unbalance controlled to ≤0.4 g·cm/kg (G0.4 grade) and vibration amplitude controlled to ≤0.8 μm. The rolling-zone temperature can reach approximately 150–250°C, requiring the sleeve to withstand repeated thermal and mechanical stresses during operation.
- GW Precision
- China，Luoyang
- Contractual Stipulation
- Anual Capacity of Steel Spool is 4000 pieces
- Information
Aluminum strip rolling mill cast steel sleeve (dynamic balance inspection)
The Aluminum Strip Rolling Mill Cast Steel Sleeve is a large-size cast steel component designed for aluminum strip and aluminum foil rolling equipment. It is manufactured from 35NiCrMo steel and has a specification of 565 × 505 × 1700 mm. The sleeve is designed for high-speed rotating conditions, repeated mechanical loading and alternating thermal stress encountered during aluminum rolling.
The sleeve is suitable for aluminum strip rolling applications with rolling speeds of 1200–2500 m/min and material thicknesses of 0.1–2.0 mm. Typical equipment includes four-high and six-high cold rolling mills and 20-high Sendzimir rolling mills. In 20-high mill applications, the sleeve can be used for battery foil and packaging foil production.
35NiCrMo Steel and Heat Treatment
The sleeve uses 35NiCrMo steel, with a specified tensile strength of ≥850 MPa. The material provides the strength, impact toughness and fatigue resistance required for a large rotating component subjected to repeated mechanical loading.
The material is treated by quenching and high-temperature tempering. After heat treatment, the specified hardness is HRC 30–40. This heat-treated condition provides a controlled combination of strength, hardness and toughness for the sleeve's working conditions.
The actual instantaneous temperature in the rolling zone is approximately 150–250°C. The supplied material data also specifies a short-term working temperature capability of approximately 400–500°C. These conditions require the sleeve to withstand repeated thermal-mechanical loading without compromising its structural stability.
Dynamic Balance for High-Speed Rolling
Dynamic balance is an important requirement for this aluminum rolling mill sleeve because of its high rotational speed. The residual unbalance is controlled to ≤0.4 g·cm/kg, corresponding to G0.4 grade.
The sleeve is also designed to suppress high-frequency vibration, with the specified vibration amplitude controlled to ≤0.8 μm. Controlling residual unbalance and vibration helps improve rotating stability during high-speed aluminum strip and foil rolling and supports consistent rolling conditions.
The combination of material strength, heat treatment, dimensional accuracy and dynamic balance is therefore considered throughout the manufacturing process rather than only during final inspection.
Large-Size Precision Machining
The sleeve blank is initially processed on a hole drilling machine developed by GW Precision Technology. During boring, the machining process is used to control the concentricity between the front and rear ends of the inner aperture.
The workpiece remains fixed while the tool shaft rotates to cut the inner hole. This machining method helps reduce taper and form errors in the aperture. It also supports smoother chip removal during machining, which helps improve surface finish and reduce the possibility of scratches caused by chip accumulation.
After the initial hole machining, the sleeve is further processed on a double self-centering CNC machine tool developed through years of experience in high-precision large-size machining.
Hydraulic support chucks are installed at both ends of the machine to quickly locate the inner-hole ends of the workpiece. This positioning method helps maintain the required concentricity during subsequent machining. The CNC process is then used to machine the outer cylindrical surface while maintaining the required relationship between the inner and outer surfaces.
The conical circular surfaces of the inner holes at both ends are also machined with the required concentricity. This machining sequence provides controlled geometric accuracy for a large rotating sleeve used in high-speed rolling equipment.
Welding and Quality Control
When welding repair is required, the sleeve is preheated to approximately 200–300°C before welding. After welding, post-weld heat treatment is applied to reduce the risk of cracking and control residual thermal stress.
Quality documentation for the finished sleeve includes a chemical composition analysis report, heat treatment report, material mechanical analysis report, dimensional tolerance report, and shape and positional tolerance report. These records provide traceability for the material, heat-treatment condition and finished machining results.
The combination of 35NiCrMo material, controlled heat treatment, large-size precision CNC machining, dynamic balance inspection and documented quality control provides a complete manufacturing process for cast steel sleeves used in high-speed aluminum strip and foil rolling mills.
Customized Manufacturing
GW Precision Technology manufactures this 35NiCrMo cast steel sleeve according to the technical and dimensional requirements of the customer's rolling equipment. The 565 × 505 × 1700 mm sleeve specification, high-speed application range, dynamic balance requirement, machining process and inspection documentation can be incorporated into the manufacturing and quality-control process for the specified aluminum rolling application.
