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ELBOWS: Mandrel method (Hot Forming)
- One of the most common elbow manufacturing processes for manufacturing Elbows from the pipe is mandrel method which is kind of hot forming methods.
- In this method, a pipe is cut in pieces and push with the help of hydraulic ram. Induction heating coil heat the pipe and, it is pushed over a die called “mandrel” which allows the pipe to expand and bend simultaneously.
- This method can be used to manufacture a wide range of the diameter of elbows. In this graphics, you can see that in first step pipe is cut into the desired length. This cut pipe is then set on the mandrel to die. In next step with the help of hydraulic rem pipe is push on the die and at the same time induction coil heat the pipe pieces resulting in the elbow. In next stage, the elbow is sent for heat treatment and machining before its offer for visual and dimension inspection.
In cold Extrusion method, a pipe with the same diameter as a finished product is pushed through a die and formed into its desired shape. Usually applied to stainless steel small to medium sizes elbows.
Here you can see that a cut pipe piece is pushed into the cold bending die. Proper lubrication is required to avoid excessive friction and protect surface finish of the final elbow. In next stage, the elbow is sent for heat treatment and machining before its offers for visual and dimension inspection.
UO method is used to manufacture medium size elbow, tee, and reducers. The plate is cut out into a specially designed shape, it is formed first into a U-shape using a die and then into an O-shape or into a tubular form using another die, that is why this method is known as UO method.
Once the fittings formed in tumbler shaped it is welded from inside and outside of the closing seam. A very large size elbows are made of two separate pieces of plate. But follow the same process. Here you can see the same. In next stage, the elbow is sent for heat treatment and machining before its offers for visual and dimension inspection.
Hot Forming Method
In a Hot Forming Die Bending method a Pipe is heated to forming temperature & formed in the die with the specific shape, this process may be repeated as needed to obtain the required shape, size, and wall thickness. Usually applied to thick-wall items that cannot be bent on a mandrel die
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