Aluminum Hub PU Coated Industrial Wheel

We were established in 2007 and are a manufacturing and trading enterprise specializing in the R&D, production, and sales of polyurethane products. Our main products include polyurethane wheels, polyurethane air hoses, polyurethane sheets, polyurethane screens, polyurethane forklift covers, polyurethane pipeline pigs, and other polyurethane products. With our development, we have also begun to expand into the field of polyurethane raw materials. We have become an integrated enterprise covering everything from raw material production to product manufacturing and sales, meeting your needs at every stage. Our aluminum hub PU coated industrial wheel has won consistent praise from domestic and international customers for their high quality and reasonable prices. You are welcome to visit our factory at any time.

Producing aluminum hub PU coated industrial wheel centers on solving one core challenge: bonding two materials with vastly different properties - aluminum and PU. The aluminum core provides rigid load-bearing capacity, while the PU layer delivers wear resistance and shock absorption. Whether the two can stay bonded without delamination or cracking under long-term high loads depends on several critical process control points.

1. Interface Pretreatment of the Aluminum Core

1)The bond strength between the aluminum core surface and the PU directly determines wheel service life. Aluminum surfaces readily form an oxide layer or become contaminated with oil and grease. Without proper treatment, PU behaves like adhesive applied to smooth glass - separation under heavy load is inevitable.

2)The aluminum core must undergo thorough chemical degreasing to remove oil contamination, followed by sandblasting. After cleaning and roughening, a dedicated PU-to-metal adhesive must be applied immediately.

3)Both the primer and PU raw materials are extremely sensitive to moisture. Compressed air must be equipped with drying and filtration devices to prevent water vapor from contacting the uncured adhesive layer. Otherwise, bubbles or whitening may occur at the interface, severely weakening bond strength.

2. Structural Design and Deformation Prevention of the Aluminum Core

1)Aluminum is less rigid than steel, and its coefficient of thermal expansion is greater than that of PU. During high-temperature PU pouring and subsequent cooling, the aluminum core is prone to dimensional deviation or deformation caused by thermal expansion and contraction.

2)Preventing thermal deformation: For wheels with high precision requirements, the process sequence must be optimized. For example, rough-machine the aluminum core first, then perform final machining (such as finish turning the outer diameter and bore) after the PU has been cast, cured, and fully cooled. This eliminates deformation caused by thermal stress and ensures finished tolerances.

3)Beyond adhesion, the aluminum core can be structurally designed with grooves, knurling, or drilled holes, allowing liquid PU to embed into these features during curing and form a physical "interlock."

3. Pouring Process and Curing Control

1)The PU raw material ratio, mixing, and curing temperature curve are key to ensuring the physical properties of the PU layer itself - hardness, rebound resilience, and wear resistance.

2)Precisely calculate the isocyanate-to-polyol ratio according to hardness requirements. Mixing must be uniform, and pouring must follow deaeration to prevent bubbles within the PU layer from becoming stress concentration points.

3)After pouring, a strict stepped curing schedule must be followed. Typically, initial curing is performed in an oven at 80–120°C to give the PU initial strength, followed by room-temperature maturation or prolonged low-temperature post-curing to achieve final crosslink density and physical properties. Under-cured PU tends to be soft with poor wear resistance; over-curing may cause brittleness.

4. Environmental and Safety Control in Production

During the production of aluminum hub PU coated industrial wheel, attention must also be paid to environmental and safety control, including aluminum machining areas, grinding zones, and pouring and adhesive spraying procedures.

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