What are the methods of using stainless steel elbows?

1. The bent tire is also one of the factors that affect the quality of the bent pipe. When we manufacture bent tires, in addition to the standard size requirements that are restricted to the scope of public service, we also require users to select the corresponding bent tires according to the bent pipe diameter during service.

2. The bendable performance and surface corrosion of the pipe itself may also affect the quality of the elbow. When starting the site, the operator also needs to know the information of the processed pipeline, the processing performance and make a production judgment on the surface corrosion work.

3. When the tube is bent, the outer arm wall of the outer edge layer of the tube is thinned by the tensile stress effect under the effect of the external force distance M, and the inner side is under compressive stress. Effective and thickened, the combined forces N1 and N2 make the cross section of the tube deformed. Based on this element, the primary reason for the reduction of the quality of the elbow is due to RX and SX. In GBJ235-82, the RX value and the amount of thinning on the outside under various pressure levels are clearly specified. The policy is to control The values ​​of RX and SX, therefore confirm the quality.

4. As mentioned in the previous article, when the pipe is bent, the data is stretched on the outside and the neutral axis on the inside is different from the bending method. The neutral axis is approximately at a distance from the outer wall during top-bending (compression bending) work. At 1/3, the neutral axis is at 2/3 away from the outer wall during turning work. Due to the bending of this thin-walled pipeline, the service turning method is beneficial.

stainless steel elbow is a forming process that has been used for mass production of elbows without seams. At present, in the production of commonly used standard elbows, it has been replaced by hot push method or other forming processes. However, in some standard elbows, due to the small number of production, excessively thick or thin wall thickness, stainless steel elbows are formed. The method is still in use. For the stamping and forming of the elbow, the tube blank with the same outer diameter as the elbow is selected, and the forming is directly restricted in the mold by a press. Before punching, the tube blank is placed on the lower mold, the inner core and the end mold are loaded into the tube blank, and the upper mold starts to limit its downward movement, and the elbow is formed through the constraint of the outer mold and the support effect of the inner mold. Compared with the hot pushing process, the appearance quality of stamping forming is not as good as the former; the outer arc of the stamping elbow is in a stretched state during forming, and there is no remaining metal in other parts to compensate, so the wall thickness at the outer arc is reduced by about 10% about. Due to the characteristics of being suitable for single-piece production and low cost, the stamping elbow process is mostly used for the manufacture of small batches and thick-walled elbows.