Production technology of bend:
First, push the material for thermal system, making machine is a head or a horn core mandrel, mandrel from fine to coarse, elbow push system process is a process with a curved hole diameter, the back support, under the section through the mandrel, a memorial arch frame behind the mandrel is fixed, the middle one car, car through hydraulic transmission, some mechanical transmission by screw drive, and then push the car, the car pushes down the mandrel pipe, outside the core rod, induction coil, there is a heat pipe, heat, and then push the pipe under the car, a processing up.
Second, finishing process, through shot peening processing, remove iron oxide on the surface of the elbow inside and outside, put on both ends of the groove processing for welding.
Third, we should first selected specifications, the pipe material is put forward, such as, 90 degree Angle, through its curvature can calculate how much material can work out the 90 ° elbow, then cut off for the length scale.
Fourth, pushing, elbow to plastic under thermal state, because of some elbow after improper handling, will be distorted, this is not allowed.In addition, after have a haircut is usually large front end diameter, through plastic mould for plastic.Plastic mould is actually a press, want to have a set of mould, two and a half arc, the upper one.After the plastic outer diameter to the size of the finished product.
Elbow classification method, according to its radius of curvature to points, can be divided into long radius elbow and short radius elbow.Long radius elbow refers to its radius of curvature is equal to 1.5 times the pipe diameter, R = 1.5 D.Short radius elbow refers to its radius of curvature is equal to the pipe diameter, namely R = D.Type D bend diameter of R for the radius of curvature.If according to the grades of pressure points, about 17 species, and the United States, the pipe standard is the same, there are: Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS;Sch80, Sch100, Sch120, Sch140, Sch160, XXS, one of the most common is two kinds of STD and XS.According to bend Angle, has 45 o Angle, there are 90 o o elbow bend and 180.So there are a lot of kinds of elbow, an order when the order is often said to take the following methods: such as "LR STD 90 o 8," said long radius, pressure rating for STD, 90 8 "elbow; another example," o SR XS 45 o 4, "said short radius, the pressure levels for XS, 45 o 4" elbow.More about classification for the elbow.
According to the need of a circular ring shell can be cut into four 90 - degree bend or six 60 degree elbow or other specifications of the elbow, the process is suitable for manufacturing elbow pitch diameter and any specifications of large elbow bend diameter ratio greater than 1.5, is the ideal way to make big bend.This process molding method used in the production of different bend, show good use value in different areas, the process in the different Angle to make good value.Bend forming process is complicated, need according to the use of the different material and welding, gradually forming under the certain pressure.Bend forming shall be carried out according to certain procedure, strictly abide by the corresponding process flow, or produce bend can produce quality problem.Big bend forming technology of the basic process is: first, welding a cross section of a polygon or both ends closed multi multi ring shell fan shell, when the internal pressure medium, full with inner pressure and internal pressure under the action of cross section of polygonal gradually became round, and eventually become a circular ring shell.This is the big elbow process molding process.
Bend the pipe installation is a common connection with fitting, used for connection of pipe bend, bend and flange of a lot of more phyletic, they have a very important role in the pipeline.
1. The material is divided into carbon steel, cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, PPC, etc.
2. To make method divided into pushing, pressing, forging, casting, etc.
3. To make standard classification can be divided into the national standard, the electric standard, water standard, American standard, Germany standard, Japanese standard, the standard and so on.
Bend, flange is mainly used in chemical, petroleum, petrochemical, electric power, water conservancy, pharmaceutical, boiler, shipbuilding and other industries.Bend in the products production for booster, connection, turn, turn, reserved (refers to facilitate product design later modify), flange for piping and valves, is convenient for connection and installation.
