Discussion on the forming technology of titanium tee pipe fitting

For the common titanium three-way pipe fittings, because of its small diameter, thin wall, and high pressure requirements of parts, casting method to manufacture is not only difficult and its quality can not be guaranteed. If use two straight pipe welding, because for the curve of two cylindrical space weld, cutting and welding operation is difficult to grasp, moreover parts size is small, only from external welding, its internal welding quality is not easy to keep the casting and welding even can complete its shape, because they are hard to avoid in the process have stomata slag produced. This and process defects are not allowed for medium and high pressure pipelines. Technicians proposed by forging or radial extrusion process made T solid bad material first, and then, again, the horizontal and vertical direction drilling method, but the experimental results show that titanium tee fitting quality is not easy to maintain, moreover, this process there is a machining process, low utilization rate of large equipment, metal materials needed more disadvantages. Finally, the decision to use straight tube also extrusion forming, filling the straight tube blank into the mold cavity, upper and lower die closed die, and then with the same diameter size of the rod (2 pieces), from both sides at the same speed, the titanium tube in the mold cavity under pressure at both ends must produce plastic deformation; Thick or extrude along the radial hole of the die. Since the tube is filled with incompressible packing, lazy deformation is not possible. Therefore, the straight pipe is extruded with the packing through the radial hole in the die under pressure. In order to prevent the extruded radial pipe from bursting under the internal pressure of the packing, a push rod is installed in the radial hole of the mold, and sufficient compressive stress is applied to the extruded radial branch pipe. When squeezed branch pipe meet the size requirements, open mode, clear the packing, you can get the required titanium tee fitting, practice shows that the extrusion of tee pipe fitting three direction of wall thickness, the same lazy coarse deformation is small, extrusion part of height to diameter of 2 ~ 3 times on the other hand, due to the packing and titanium pipe synchronous movement inside the cavity, tube wall has no mechanical damage, size and quality to meet the drawing requirements.