SMS group has further developed the push bench process into CPE (Cross-roll Piercing and Elongation) and TPE (Three-roll Piercing and Elongation). This means thee product range is has thereby been extended compared to previous concepts and the processes offer substantial benefits in terms of both quality and cost efficiency. Both methods differ from the conventional push bench method in the first forming stage, the piercing process.
With the CPE method, the piercing press, elongator, and hollow billet reducing mill are replaced by a high-performance two2-roll piercing mill, which acts as a piercing and pre-stretching unit. The process therefore requires fewer forming stages, so plant owners can reduce conversion costs measurably. At the same time, they can use higher billet weights and achieve better wall thickness tolerances. The output on CPE mills is considerably higher than with the conventional push bench method. Modern CPE mills, therefore, are a highly efficient, flexible, and economic alternative in the production of tubes with medium to small diameters.
With TPE mills, SMS group uses a three3-roll instead of a two2-roll cross-roll piercer. As a result, the quality of the hollow before the stretching process on the push bench has increased even further.