Production process of 90 degree stainless steel elbow

　　Production process of 90 degree stainless steel elbow

　　Hot push forming of ANSI B16.9 90 Degree Stainless Steel Pipe Fitting Elbow

　　The hot push Stainless Steel Pipe Elbow forming process uses a special pipe elbow push machine, a mandrel and a heating device, so that the blank placed on the mold moves forward under the push of the push machine, and is heated, expanded and bent into shape during the movement. the process of. The deformation characteristic of the hot-pushed ANSI B16.9 90 Degree Stainless Steel Pipe Fitting Elbow is to determine the diameter of the tube blank based on the rule that the volume of the metal material does not change before and after plastic deformation. The diameter of the tube blank used is smaller than the diameter of the ANSI B16.9 90 Degree Stainless Steel Pipe Fitting Elbow. The deformation process of the blank is controlled by the mandrel, so that the inner arc is compressed. The metal flow compensates for other parts that are thinned due to diameter expansion, thereby obtaining ANSI B16.9 90 Degree Stainless Steel Pipe Fitting Elbow with uniform wall thickness.

　　The hot push pipe elbow forming process has the characteristics of beautiful appearance, uniform wall thickness and continuous operation, which is suitable for mass production. Therefore, it has become the main forming method of carbon steel and alloy steel pipe elbows, and is also used in certain specifications of stainless steel elbows. is taking shape.

　　The heating methods used in the forming process include medium-frequency or high-frequency induction heating (the heating circle can be multiple turns or single turns), flame heating and reverberatory furnace heating. The heating method used depends on the requirements of the formed product and the energy situation.

　　Stamping forming of ANSI B16.9 90 Degree Stainless Steel Pipe Fitting Elbow

　　Stamping ANSI B16.9 90 Degree Stainless Steel Pipe Fitting Elbow is the earliest forming process used in mass production of seamless pipe elbows. It has been replaced by hot pushing or other forming processes in the production of stainless steel elbows with common specifications. However, in some stainless steel elbows with certain specifications, due to the production volume Less, the wall thickness is too thick or too thin.

　　The product is still used when there are special requirements. The stamping forming of the stainless steel elbow uses a tube blank that is equal to the outer diameter of the stainless steel elbow and is directly pressed into the mold using a press.

　　Before stamping, the tube blank is placed on the lower mold, and the inner core and end mold are loaded into the tube blank. The upper mold moves downward to start pressing. The 90 degree stainless steel elbow is formed through the constraints of the outer mold and the support 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 90 degree stainless steel elbow is in a stretched state during forming, and there is no excess metal in other parts to compensate, so the wall thickness at the outer arc is reduced by about 10%. . However, due to its suitability for single-piece production and low cost, the stamping 90 degree stainless steel elbow process is mostly used for the manufacture of small batch, thick-walled elbows.

　　Stamping 90 degree stainless steel elbows are divided into cold stamping and hot stamping. Cold stamping or hot stamping is usually selected according to the material properties and equipment capabilities.

　　The forming process of cold extrusion elbow is to use a special 90 degree stainless steel elbow forming machine to put the tube blank into the outer mold. After the upper and lower molds are closed, under the push of the push rod, the tube blank is pushed along the reserved areas of the inner mold and the outer mold. Clearance movement completes the forming process.

　　The 90 degree stainless steel elbow manufactured by the cold extrusion process of the inner and outer dies has a beautiful appearance, uniform wall thickness, and small size deviation. Therefore, this process is often used for the forming of stainless steel elbows, especially thin-walled stainless steel elbows. The internal and external molds used in this process require high precision; the wall thickness deviation requirements of the tube blanks are also strict.

　　Medium plate welding of ANSI B16.9 90 Degree Stainless Steel Pipe Fitting Elbow

　　Use the middle plate to make half of the 90 Degree Stainless Steel Pipe Fitting Elbow profile with a press, and then weld the two profiles together. This process is generally used to make elbows above DN700.

　　Skills requirement of ANSI B16.9 90 Degree Stainless Steel Pipe Fitting Elbow

　　Requires control of the radius of curvature. For example, if the radius length is 1.5D, then the radius of curvature must be within the required tolerance range. Since most of these pipe fittings are used for welding, in order to improve the welding quality, the ends are beveled, leaving a certain angle and a certain edge. This requirement is also relatively strict, how thick the edge is, what the angle is, and the deviation range. There are regulations, and there are many more geometric dimensions than pipe fittings. The surface quality and mechanical properties of elbows are basically the same as those of pipes. In order to facilitate welding, the steel material of the pipe to be connected must be the same.

　　Because of the many advantages of 90 Degree Stainless Steel Pipe Fitting Elbows, their market prospects are quite broad. From the above description, we can also see that the manufacturing process of small 90 Degree Stainless Steel Pipe Fitting Elbows is not simple, and the technical requirements are also quite high. This is because the 90-degree elbow is at the corner of the item being transported, which is the place where it is most likely to become loose and leak. Therefore,90 Degree Stainless Steel Pipe Fitting Elbow manufacturing factories must strictly control the quality of elbows when mass-producing elbows. When choosing ANSI B16.9 90 Degree Stainless Steel Pipe Fitting Elbow, also pay attention to its size to ensure it can engage the front and rear.