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Production Process Of Pipe Fittings

Jan. 13, 2020

The following carbon steel Pipe Bend suppliers would like to introduce the technological process of pipe fitting production. Taking the elbow as an example, if you make a long radius elbow, such as the pipe of a pipe fitting company, you must first select the specifications and propose the pipe material. Expansion rate, through theoretical calculations, the general expansion rate is between 33% and 35%, which is pushed back. A general diameter expansion ratio of a short radius of 219 mm is 50%. After selecting the raw materials, cut the material according to the specifications of the elbow, and then consider the radius of curvature. For example, a 90°elbow can calculate how long the long material can be processed into a 90°elbow. It can be calculated by theoretical calculation, and then cut with this length as a fixed length. Finally, the material is hot-pressed.


It is a horn-shaped mandrel or mandrel. The mandrel is thinned and thickened. The pushing process is a process of bending the expanded diameter band. There is support at the back, and the feeding pipe section is inserted into the mandrel. There is an archway at the back to fix the mandrel. There is a trolley in the middle, some of which are driven by hydraulic, some are driven by mechanical transmission, that is, screw, and then push the trolley forward. The trolley pushes the pipe along the core rod, and there is an induction ring outside the core rod to heat the tube and heat it well. Then the trolley pushes the tube down to process one. After pushing it, the elbow should be shaped in this hot state. Because some elbows are distorted improperly, which is not allowed. In addition, after pushing the head, the outer diameter of the front end is generally large, and the shaping is performed by a shaping die. The plastic mold is actually a press. It must have a set of molds, two semi-circular arcs, one above and one below. After shaping, the outer diameter has reached the size requirements of the finished product. The wall thickness is controlled based on the wall thickness of the material. The wall thickness tolerances of the elbows and pipes are the same, both ± 12.5%. During the pushing process, the wall thickness should not change under normal circumstances, but if there is a wall reduction phenomenon in some places due to the tool, generally a margin should be added to the wall thickness when feeding, such as 8.18 The wall thickness of mm is generally about 8.5mm, to prevent excessive tolerance due to local thickness reduction during pushing. After shaping, the outer diameter and wall thickness of the elbow have met the requirements. Next, the finishing process is performed. After the shot blasting process, the oxide scale on the inner and outer surfaces of the elbow is removed, and the two ends are beveled to facilitate welding. After the inspection, stamping, spray painting, packaging and other processes, it can leave the factory.

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