News

In order to reduce the production cost of large-diameter rectangular pipes and meet the market demand of the construction industry, the production process and key procedures of "direct square" rectangular pipes have been studied It is pointed out that in the "direct square" forming process, it is necessary to ensure that the forming angles are all greater than 90 °, the arc radius of the forming angles is greater than that of the finished product, and a dedicated gooseneck upper mold needs to be designed; The joint (pre welding) process must add an internal support roller device; The upper roller of the finishing (rolling) process must be processed with a weld seam clearance groove to prevent the weld seam clearance from causing collapse of the upper plate surface during the finishing process At the same time, the requirements for the main production equipment of large-diameter rectangular pipes, such as milling machines, forming machines, seam joining machines, finishing machines, and gantry mobile straightening machines, were elaborated Comparative studies have shown that the "direct squaring" process has significant advantages over the "round first and back" process, as it can save equipment, reduce processes, and thus lower production costs