Calculation of the expansion ratio of the push elbow
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The push elbow has a certain expansion rate. Through theoretical calculation, the general expansion rate is between 33% and 35%, and it is pushed back. The general diameter expansion ratio of a short radius of 219 mm is 50%. After selecting the raw materials, the material is cut according to the specifications of the curved elbow, and then the radius of curvature is considered. For example, the 90° elbow can calculate the elbow of 90° by the long material. It can be calculated by theoretical calculation, and then cut with the length as a fixed length. Finally, the material is hot pushed. The pusher may have been seen by everyone, and the actual situation is very simple. It is a horn-shaped core or mandrel. The mandrel is thickened and thinned. The pushing process is a process of bending the expanding belt. There is support at the back, the cutting pipe section is inserted into the mandrel, and a rear frame is used to fix the mandrel. There is a small car in the middle, some of the cars are driven by hydraulic pressure, some are driven by mechanical transmission, that is, Screw drive, and then push the trolley forward. The trolley pushes the tube forward along the mandrel. There is an induction coil outside the mandrel. The tube is heated and heated. Then the trolley pushes the tube down and processes one. After pushing it, the elbow is pushed to be shaped in this hot state. Because some elbows are handled improperly, they will be distorted, which is not allowed. In addition, after the head is pushed, the outer diameter of the front end is generally large, and it is shaped by a shaping die. The shaping die is actually a press. It must have a set of molds, two semi-circular arcs, one on each side. The outer diameter after shaping has reached the size requirement of the finished product.
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