Research On Tribological Behavior Of Rubber Roller For Strip Steel Transportation In Tin Electroplating Line

The rubber roll is commonly used in the strip production units of the strip transmission.It is composed of a cylindrical steel core and wrapping rubber layer. Rubber roller is in contact with the strip directly, and the strip endure great tension, which will definitely lead to serious friction and wear between the rubber roller and the strip. Due to its good mechanical properties and wear resistance, rubber rollers are commonly used in strip production process. But under the condition of high-speed operation and the relatively rough surface of the strip, rubber rollers are likely to fail, which cause the adhesion of debris stick to the strip, affecting the surface quality of the strip. But replacing the rubber roller will affect the continuity, which will cause serious economic losses.In this dissertation, spectroscopy analysis of rubber rollers on the existing strip tin electroplating unit had been conducted. The result indicated that most rubber rollers are made of CSM or NBR. Fourier spectroscopy analysis was used to analyze the sticky substance on the strip surface.The test showed that there was rubber in the mixture, so it can be concluded that rubber rollers had worn.And wear mechanism of rubber roller had also been discussed.In order to have a comprehensive understand of mechanical properties of rubber rollers, a finite element model had been created. Stress distribution of rubber roller was analyzed by FEM. Effect of strip wrapping angle, rubber layer thickness and strip tension on stress distribution of roller were discussed respectively, and fitting model of maximum von-mises stress on roller was developed. The computational results indicated that the maximum stress always appears where the rubber roller was to contact the strip steel and the magnitude of wrapping angles exert no effect on stress value. Maximum stress on roller was in exponential relationship with wrapping angle, increases with the thickness of rubber layer and was proportional to strip tension.A new kind of rolling wear test rig was established to test the friction and wear behavior of rubber roller cured by different degree.The different vulcanization degree had been proved to influence the mechanical properties of the rubber, the surface quality of the wrapping-layer rubber, the coefficient of friction and viscoelasticity. CSM rubber roller failure mechanisms was cracks and expansion when undercured, crack propagation when optimum cured and softening when overcured. NBR rubber roller failure mechanism was obvious softening and material accumulation when undercured, crack growth and result in material missing when optimum cured, rubber layer seperated from the steel core when overcured.