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Forming technology of large caliber elbow

Forming technology of large caliber elbow

The basic process of forming technology of alloy large diameter elbow is as follows: firstly, a polygonal annular shell with cross section or a polygonal fang-shaped shell with closed ends is welded. After the internal pressure is filled with pressure medium, internal pressure is applied. Under the action of internal pressure, the cross section gradually becomes a circle from the polygon and finally becomes a circular annular shell.According to the need, a circular shell can be cut into 4 90 o elbow or 6 60 o elbow or other specifications, the process is suitable for making the middle diameter of the elbow and the inner diameter of the elbow ratio is greater than 1.5 in any specification of large elbow, is currently an ideal way to manufacture large pressure elbow.

The advantages of large caliber elbow are mainly shown in the following aspects:

(1) The pipe billet is not needed as raw material, which can save the cost of pipe making equipment and mould, and the elbow with arbitrary large diameter and relatively thin wall thickness can be obtained.

(2) the blank is flat or developable surface, so the blanking is simple, the accuracy is easy to ensure, and the assembly and welding are convenient.

(3) Because of the above two reasons, the manufacturing cycle can be shortened and the production cost is greatly reduced.Because no special equipment is needed, it is especially suitable for field processing of large elbow.The technology has been applied for national invention patent.

Technical indicators

This technology is suitable for manufacturing the working pressure is less than 10MPa, the inner diameter of the elbow D?125mm, any elbow with the ratio of D/ D of the middle diameter of the elbow to D/ D of the elbow to 1.5, and the size of the middle diameter of the alloy stamping elbow is unlimited.For example, the inner diameter of the elbow can be processed for 12m, and the middle diameter of the elbow is more than 60m.

Elbow push machine and the advantages of the device process

Elbow Pushing Machine: Elbow Pushing Machine is a special equipment for the production of elbows. It can produce carbon steel and alloy steel elbows with the wall thickness of 21-1620mm and the thickness of 3-120mm and above 1D.

Elbow push machine in the device to first pull out the elbow push machine clamping die fixed mandrel.Place the clamping die of the elbow push-making machine, and then Pierce the fixed mandrel into it.Install elbow push machine, the next step is debugging, elbow push machine clamping die seat fixed relax, elbow push machine will control panel in manual form, press the tube button, to the end of the jia mo way.At this time there need to be a gap between the wheels, you can adjust the screw seat to adjust.Adjust the whole screw of the jia mo seat so that the jia mo and the wheel mold are completely closed.Press the back clamp button to retreat the steamed bun, and then the elbow push machine will adjust the steamed bun screw clockwise to turn about 1/2-1/4 laps.Then lock the fixing nut of the sandwich seat.The above mainly introduces the advantages of the elbow push machine and the device process.

2085-2074.