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Stainless steel pipe and elbow pipe fittings technical requirements
作者: 发布于:2011/4/18 17:30:50 点击量:

    Pipe production process. To elbow was, if the long radius elbow, such as in the days of tube tube, to select the specification, put forward tube material. Expanding rate, through theoretical calculation, general expanding rate in 33%-35%, push back. Short radius 219mm general expanding rate of 50%. Select material.

    According to the elbow specifications material, and then consider the radius of curvature, such as.

    90 degree elbow, through its curvature can be calculated under long feed can process 90 DEG. elbow. Through the theoretical calculation can be calculated, then the length of fixed length cutting. Finally the material for manufacture of. Pushed the system you may have seen, is actually very simple. It is a horn shape core or mandrel.

    The mandrel by a fine thicker, pushing the system is a process of expanding band bending process. Behind the support, the blanking pipe thread mandrel.

    A memorial arch frame behind a fixed mandrel. There is a car, car some through hydraulic transmission, some through the mechanical drive transmission, and then push trolley. Dolly pushing pipe along the mandrel ahead, the exterior of the mandrel has an induction coil, the tube heating.

    Heating is good, then the trolley pushing the tubing, on the processing of one. Push, elbow should state of hot plastic. Because some elbow processing is undeserved, will be distorted, this is not allowed. In addition, the pusher head after the general end diameter.

    Through shaping mould shaping. Plastic mold is actually a press, must have a set of mold.

    The 2.5 arc, the next one. After shaping outer diameter is reached the size of finished products requirements. Wall thickness is the wall thickness control. Elbow and pipe wall thickness tolerances are the same, are + 12.5%. In the pushing process, under normal circumstances the wall thickness should not change, but if because of tool reason, some will take place the wall reduction phenomenon.

    So the general feeding, wall thickness to add some allowance.

    If the elbow is 8.18mm wall thickness.

    Generally carry around 8.5mm pipe, prevent the push system due to local thinned and ultra difference. The shape of the outer diameter, wall thickness, elbow size meets the requirements. The finishing process.

    After shot peening, the elbow inside and outside surfaces of the iron oxide removal.

    The ends of groove for welding processing. After examination, playing steel word, spray paint, packaging and other processes after. It can be manufactured. The above is 24 ' to seamless steel tubes as raw materials production elbow method, more than 24" after the above 600mm. Maximum bend in 2.032 meters to 2.80 meters. Is done with the steel plate. The plates are required to cut into the material after. Like UOE molding, but also through the stamping punch into the circular. There are two halves and then split, welding. Due to the presence of the weld, so to nondestructive testing. Because of the welded stress exists, so also for heat treatment. Welded elbow much two processes : one is the flaw detection. Two is a heat treatment. Other program for the same. Three links of the production process are basically is so. According to the three different specifications of blanking. After unloading to sandblasting, in forming the surface of the oxide scale removing. Forming the hydraulic bulge forming. Mold, mold bottom is flat, it has a flange hole. After the tube into the tube, with the hydraulic cylinder is fixed, on both sides of filling liquid inward bulge, the tube is extruded into" convex" shape, then the projection from the appropriate location of the resection, also called Cheng Po. It is to pass a two shot peening. Because the processing process, a hardening heat treatment, so it need. Pipe production process is the situation.