How to protect the uniform of steel pipe wall thickness

In order to ensure that the wall thickness of steel pipe is uniform, the center axis of the tube must be punched. Therefore, the pressure before the hole extrusion, ingot or billet to be shaped; cross-piercing, round billet to be centering. The purpose of centering is to facilitate the perforation of the nose nose aligned tube axis to prevent the bud when the perforation biased to reduce the uneven thickness of the front end of the capillary while improving the oblique rolling fL bite bite conditions so wear fL process Smooth progress. The centering method is cold and hot. Heat centering is in the tube heating, with compressed air or hydraulic punching in the hot state, the device is set at the piercing machine at the front desk. This method is highly efficient, has no metal consumption, is simple in equipment and has a wide range of applications. At the same time, a good centering hole size can be obtained because the shape of the punch matches the shape of the tip nose. However, over the past decade or so, with the improvement of technology and equipment, fewer and fewer units are equipped with heat-set centers. Some foreign manufacturers believe that perforation of the rotating bite on the tube has a certain self-aligning effect.