The basic feature of St52 Honed Tube production is that the pipe material before cold deformation and after the accumulated cold deformation has reached a certain level, a series of preparations are required to eliminate work hardening and other needs before continuing to cold deformation. There are more processes. ; The pipe material usually undergoes many cold deformations from being put into production to being processed into finished products. Moreover, the entire production process often includes multiple production cycles consisting of preparation and deformation processes. The cycle is repeated, the production cycle is long, and the metal consumption is large; there are many equipment It is a single layout, usually intermittent production.
The pipe material must be carefully inspected, and its surface must not have harmful defects such as wrinkles, cracks, scars, scribes, etc.; the size should meet certain requirements, such as hot rolling. The end should be straight and free of burrs; if there are burrs, they must be removed, which is especially important for cold rolled tubes. In addition, the chemical composition and mechanical properties of the pipe material should meet the requirements in the technical conditions.
Generally, the surface of the pipe material should be pickled before inspection. Minor defects can be repaired. The external surface defect can be repaired by peeling lathe, centerless grinder, portable or hanging grinder. Grinding of internal surface defects can be performed on a grinding machine such as an internal cylindrical boring machine. Because the surface defects will continue to expand during the cold deformation process, and as the pipe diameter decreases during production, it is more difficult to grind the inner surface defects. Therefore, the surface defects of the pipe material should be eliminated as much as possible before the cold working.