pipe fttings production process

pipe fttings production process

 Here I talk about pipe fttings production process. With an inverted elbow, long radius elbows if done, as with QCCO of steel pipe, first selected specifications, proposed steel pipe material. Expansion ratio, by theoretical calculation, the general expansion ratio of 33% -35%, and push down the back. Generally short radius of the enlarged diameter 219mm was 50%. Selected raw materials, press elbow Specifications cutting, and then consider the radius of curvature, such as, 90 ° elbow, through its curvature can calculate how long the material can be processed under a 90 ° elbow. Can be calculated by means of theoretical calculation, and then to the length of the length is cut. Finally, the material for heat to push the system. Pushing machine you may have seen, actually very simple.

It is a horn-shaped pin head or mandrel, the mandrel from fine thicker, push the system process is an expanding band bending process. Behind the support, the cutting steel pipe segment penetration mandrel, behind the arch frame will have a fixed mandrel. The middle of a car, car some through hydraulic transmission, some through mechanical transmission that screw drive, then push the car forward.

 

Trolley pushing steel pipe son walked along the mandrel, the mandrel outside an induction coil, the steel pipe sub-heating, the heating is good, then the steel pipe sub trolley pushed down on processed good one. After pushing the elbow to shaping this hot state. Because some elbow handled properly, it will twist, which is not allowed. In addition, after Tuitou front are generally larger in diameter, through the plastic mold for shaping. Plastic mold is actually a press, we should have mold, two semi-circular, up and down each one. Shaping the outer diameter of the finished product to achieve the size requirements.

 

Since the thickness of the material thickness control. Elbows and steel pipe wall thickness tolerance Son are the same, both ± 12.5%. Push the system in the process, under normal circumstances thickness should not change, but if the reason for tools, some places will happen less wall phenomenon, it is generally expected to mention, the wall thickness to add some margin, such as the elbow is 8.18 mm wall thickness, generally mention about 8.5mm steel pipe son, push the system to prevent the partial reduction due to thick ultra-poor. The whole good shape after elbow diameter, wall thickness have reached the required size. Here for finishing processes, through shot peening, the inner and outer surfaces of the elbow to remove oxide scale, the both ends of the groove so that the welding process. Then after checking, playing steel word, spray paint, and packaging processes, you can factory-up.

 

 

These are 24 "in the following seamless steel pipe production process as a raw material of the elbow, more than 24" after that is more than 600mm, the maximum bend at 2.032 m to 2.80 m, is made of steel. The cut material as required after plate like uoe molding, die stamping is punched through the circle. There are two halves and then flattening, welding. Since the presence of the weld, so non-destructive testing. Due to the presence of residual stresses, therefore I have to heat treatment. Elbow Welding processes more than two: one flaw, one heat treatment. The same as other programs.