Roll bending is a metalworking process used to shape metal by passing it through two rotating rolls, typically in a rolling mill. The process involves flattening and reducing the metal to a sheet or plate. Rolling mills can be either hot or cold, depending on the temperature of the metalworking application.
In the roll bending process, the metal is fed into the gap between two or more rolls arranged in a symmetrical pattern, with half above the work and half below the work to be rolled. The rolls are mounted one above the other and rotate at the same speed in opposite directions. The metal is passed through the machine multiple times with the spaces between the cylinders decreasing each time, causing the metal to become increasingly thinner.
The process parameters for a rolling mill include machine, method of operation, and rheological behavior. The rheological behavior is the most important group but cannot always be influenced. The machine has to be able to handle a wide range of viscosities, either with very low line force or with an accurate roll positioning system. If the mill base can be adapted, this can optimize the process the most.
Design features for the roll design and pressing have changed over the years due to different applications. For example, metal pastes need to be processed very gently in the beginning, and more aggressively at the end. Electronic materials are getting lower in viscosity because of very thin film applications, and need to be processed by roll positioning.
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