How to make 90 degree elbow from pipe
how to make 90 degree elbow from pipe
Elbow is a kind of pipe used for pipe turning. It has 90 degree elbow, 45 degree elbow, etc. It can be manufactured according to engineering needs. Different materials and different pressure elbow manufacturing processes are different. So far, bend The seamless elbows often produced by head manufacturers are made of steel pipes. The seamless elbow manufacturing process has a number of elbow manufacturing methods such as hot push elbow, punch elbow, and extrusion elbow.
The hot push elbow is a process used in the production of seamless elbows. The elbow pusher, the core mold and the heating device are used, and the blanks placed on the mold are driven forward by the elbow pusher. The process of heating and expanding and bending in the operation of the pipe. The deformation characteristic of the hot push elbow is to determine the diameter of the tube blank according to the law of the volume change of the metal material before and after plastic deformation. When the tube is used, the diameter of the tube is smaller than the diameter of the elbow, and the compensation factor is obtained during the heating deformation of the tube. Expanding the diameter and thinning other parts, so that the elbow with uniform wall thickness is obtained, which is the manufacturing process of the push elbow.
The elbow pushed out by the pusher has a beautiful appearance, uniform wall thickness and can be continuously manufactured. It can be used to mass produce elbows. Therefore, the main process for the production of carbon steel elbows and alloy steel elbows is to use push. It is manufactured and used in the forming of stainless steel elbows of certain specifications. The stamping elbow manufacturing process is the earliest application process for mass production of seamless elbows. It has been replaced by hot push elbows in the commonly used elbow specifications, but the elbows in some models are produced. The amount is relatively small and the wall thickness is too thin or too thick. The special requirements of the product are to use the stamping production process. In the process of forming the stamping elbow, the caliber is the same as that of the produced elbow, and the press is directly pressed into the mold.
The stamping elbow is divided into cold stamping and hot stamping. The material of the stamping elbow is selected and manufactured. The manufacturing process of the stamping elbow is not as good as the elbow. The quality is not as good as the former. The outer elbow of the stamping elbow is stretched during forming. In the state, there is no excess metal in other parts to compensate, so the wall thickness at the outer arc is about 10% thinner. However, due to its application to unit manufacturing and low cost, the stamping elbow manufacturing process is suitable for the production of high-pressure thick-wall stamping elbows in small batches.
The extrusion elbow uses a special elbow forming machine to put the tube blank into the mold. After the upper and lower molds are closed, the tube blank is moved along the gap between the inner and outer molds to complete the forming process. . The elbow manufactured by the inner and outer mold cold extrusion process has beautiful appearance, uniform wall thickness and small dimensional deviation, so the cold extrusion manufacturing process is suitable for the manufacture of thin-walled stainless steel elbows. The precision of the inner and outer molds used in this process requires precision. High; the wall thickness deviation requirements for the tube blank are also harsh.