Bulging, rolling machines are special machines used in metalworking. They are used to smooth and strengthen metal surfaces. The equipment works by rolling metal plates or sheets, plastically deforming the material. In the process, minor irregularities and scratches are repaired and the surface is tightened. The equipment can also be used to create surface textures or increase the strength of materials. A bulging, rolling line usually consists of a rolling machine with rolls that have either a straight or a profiled surface. The rolls are pressed on top of each other and the material to be processed is passed between them. The material is tightened and smoothed by the plastic deformation. This type of equipment is often used in the automotive industry to process car body sheets and increase strength and stability. However, they can also be used in other areas where a smooth, tightened surface is required, such as in the production of containers or pipes.