There are many kinds of bending process methods, according to the bending forming way can be divided into rolling bending, pressure bending, push bending and winding.

1, the preconditions of elbow processing

• according to the relevant standards and regulations processing (bending pipe to horizontal and vertical, span and spacing to meet the specification requirements).No unstable condition is allowed no matter how high the elbow is machined.
• the basic ground to level off, rammed, hard, its metal substrate is also level off, can not have any deformation, the ground is soft should use sweeping rod or pad to increase the force surface and increase stability.
• the raw materials used should be qualified, deformation, cracks and other defects of the bend rod, connectors and fasteners are strictly prohibited to use, the fasteners of the bend, connectors shall not be repaired by welding.
• the springboard should be laid neatly, the width and length should be consistent (except for special parts).The springboard on any elbow pipe shall be fixed firmly and there shall be no large holes on the platform surface (except for special parts).
• the basic ground to level off, rammed, hard, its metal substrate is also level off, can not have any deformation, the ground is soft should use sweeping rod or pad to increase the force surface and increase stability.
• the raw materials used should be qualified, deformation, cracks and other defects of the bend rod, connectors and fasteners are strictly prohibited to use, the fasteners of the bend, connectors shall not be repaired by welding.
• the springboard should be laid neatly, the width and length should be consistent (except for special parts).The springboard on any elbow pipe shall be fixed firmly and there shall be no large holes on the platform surface (except for special parts).

2,the bending pipe to a certain extent according to whether the use of mold when bending can be divided into die bending and no die bending.

In the operation according to its bending when there is no mandrel can be effectively divided into a core bending and no core bending;According to whether the bending heat can be divided into cold bending and hot bending.In recent years, new bending technologies such as zero radius bending, medium frequency induction bending, thermal stress bending and laser forming bending have been developed.

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3, pipe bender winding according to its whether there is a mandrel can be divided into a core elbow and no core elbow.

Mandrel type hot push elbow is in a special push machine, under normal circumstances, it will be through its horn mandrel under axial thrust, while heating and pushing system, so that the tube billet has circumferential expansion and axial bending deformation, so that the tube billet with smaller diameter is pushed into a larger diameter elbow.

4, in the process of rolling bending, the three rollers are mainly used to bend the pipe.

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However, its rolling bending has certain requirements on the bending radius. To a certain extent, it is very suitable for thick-walled pipe fittings with large radius of curvature, and it is incapable of bending with small radius.The method and working principle of rolling bending are basically the same as that of sheet metal, except that the roller used for rolling bending of pipe material has a working surface consistent with the shape of cross section of pipe billet.

When bending, you only need to change the interval between the main roller and the slave roller, and you can achieve various curvature radius bending.Among them, the roller is the main driving wheel, and the other two are the driven wheels.This method is particularly suitable for bending annular or helical pipe fittings.

Each bend is a number of times bending system, through the processing technology to form the Angle to achieve, because of the different raw materials, so there should be a corresponding on the mold, to prevent deformation and other abuses.

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