types of pipe manufacturing process
DESCRIPTION
pipe manufacturing methodsTRANSCRIPT
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DIFFERENT TYPES OF PIPE MANUFACTURING.
By Sindhur raju.T
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There are different types of pipe manufacturing methods. Some of them are..
∙ Seamless pipe.∙ Metal Extrusion.∙ Centrifugal casting.∙ Electric resistance welded pipe.
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Seamless pipe manufacturing process:
◑ In this a solid round (billet) is used. It is heated in a rotary heating furnace and then pierced by a piercer.◑ The pierced billet is rolled by a mandrel mill to reduce the outside diameter and wall thickness which forms a multiple length mother tube.
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Extrusion:
Extrusion is a process used to create objects of a fixed cross-sectional profile. A material is pushed or pulled through a die of the desired cross-section.
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Metal extrusion◑ A work piece of a certain length of cross section is forced to flow through a die of smaller cross sectional area.
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Extrusion process can be done in 4 ways:◑ Hot Extrusion.◑ Cold extrusion.◑ Direct extrusion.◑ Indirect extrusion.
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Hot extrusion
◑ Involves working a metal above its recrystallization temperature. ◑ Generally preferred for larger parts, more extreme changes in shape and for more complex geometry
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Cold extrusion
Cold extrusion of metal is usually used for smaller parts, less complex shapes, more workable materials
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Direct Extrusion:
In this work billet is contained in a chamber the RAM exerts force on one side of work piece.
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Direct extrusion of hollow pipe:
With the use of a mandrel attached to the dummy block. A hole is created through the work, parallel to the axis over which the ram applies the force to form the extrusion.
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Indirect extrusion:
In this process the work piece is located in a chamber that is completely closed off one side,and die is forced from other end.
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Indirect extrusion of hollow pipe:
In this process, a ram is forced into the work material. The ram gives the internal geometry to the tubular part, while the material is formed around it.
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Centrifugal casting:
It is a technique that is typically used to cast-thin walled cylinders and for high quality results.
In centrifugal casting, a permanent mold is rotated continuously about its axis at high speeds (300 to 3000 rpm) as the molten metal is poured.
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The molten metal is centrifugally thrown towards the inside mold wall, where it solidifies after cooling.
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Electric resistance welded pipe:
It is manufactured by a sheet of steel into a cylindrical shape.
Current is then passed between the two edges of the steel to heat the steel to a point at which the edges are forced together to form a bond without the use of welding filler material.
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