The Combination Of Pressure Pipe Fittings Modular Design And Forming Process Method Of Research

The combination plumbing of pressure pipes is two or more adjacent on-site welding pressure pipes which are regarded designed and machininged as a whole. Pipe connecting the pressure pipes system is a very important accessory. But there is too much security incipient fault by using the welded pipes en the formidable welding environment. By using the combination plumbing, it can abate the on-site welding work, reduce the security incipient fault, and improve the integrality, continuity and consistency of the system. From another point of view, using the combination plumbing it can improve the utilization ratio of rolled products, reduce the cost, and quicken the pace of project. So it can achieve social and economic efficiency.It went deep into three aspects of the combination plumbing of pressure pipes.First, the special modular software of combination plumbing of pressure pipes was exploited. Using VB6.0 as development environment, the second development of AutoCAD had been made and the modularization of combination plumbing of pressure pipes had been achieved. The importance of this software was that it improved the catholicness used by combination plumbing of pressure pipes and reduced the periodicity of design and manufacture.Second, the mechanical property of structure by theoretical method was analyzed. Take the T-branch and elbow combination plumbing for instance, it compared the dissimilarity of stress and strain between the welded pipes and combination plumbing of pressure pipes and draw the conclusions including that:After combination, the stress in welding area is smooth. The strain of the combination plumbing contrary to the welded pipes is not disturbed. The parts away from welding area are not disturbed.Last, it went deep into machining technics and procedure parameters of combination plumbing. It got the value and the relation between internal press and axial force. The machining technics, the step of hydroforming , the scope of loading route used in tube bulge and the forming limit of three-limb and reduced combination plumbing bulge directing the manufacture had been pointed out.