Bending methods
There are a variety of methods of pipe bending, generally manual bending and mechanical bending. Mechanical bending methods and a variety of methods, such as pressure bending method, roll bending method, back bending method and squeeze bending method. Regardless of which bending method, the main contradiction in the entire bending process are such as
How to overcome the problem of local deformation. The most widely used in the project is the manual bending and bending back to the pipe bending process. Back bending method is in the rotary pipe bender bending, it can be divided into two types of mold bending and mold bending.
Hand bending
Manual bending does not require special equipment and complex process equipment, it can bend a variety of radii, angles and space towards the bend. But this bending mode of labor intensity, low productivity, quality is not stable enough.
Manual bending of steel pipe using hot bending, for stainless steel and non-ferrous metals should be used for cold bending. Before bending in the tube first filled with filler, steel pipe filler is generally pure, dry fine sand, stainless steel and non-ferrous
Metal Filler should be used rosin, lead and other low melting point materials
Quality, in order to prevent wrinkles, and reduce the degree of ovalization
Mold bending
This category of pipe bender are using mold bending. The main mold has a disc-shaped grooved wheel and ram's horn core head of two kinds. Disc-shaped groove wheel bending pipe bending mold on the outside of the pipe, half of the pipe lying in the groove, the other half of the pipe bending area with a small groove roller (also known as compression roller) pressed.
Roller (also known as compression rollers) pressed. Tube end is fixed by the chuck on the disc-shaped bending die, if the pressure roller does not move, disc-shaped bending die active rotation to complete the bend, known as pull bending; if the tube is pushed to make the disc-shaped bending die rotate to complete the bending of the passive, known as the push bending
Type; if the disc-shaped bending mold does not move, the compression roller pressed the tube around the disc-shaped bending mold rotation to complete the bend, known as pressure bending.
Sheep's horn mandrel bending tube when the bending mold in the tube on the inside, sheep's horn mandrel like sheep's horns, the axis of the length of 1/4 circumference, the bending radius and the same bending tube, the maximum bending angle of 180 °. Sheep's horns core head thin end than the inner diameter of the billet is slightly thin, the billet from the thin end of the set into the thick end is out of the
Outlet, slightly thicker than the inner diameter of the billet. Bend the billet is first heated and then set into the mold, the tube under the action of the thrust of the two processes of bending and expansion, sliding out of the end of the core head when the bending process.
Mold bending
This bending method of pipe bending machine used without a special decision to bend a certain bending radius of the bending mold. It can be divided into two types of bending and push bending. Bender has a rotating arm, arm length can be retracted, when the pipe is fixed in the rotating arm, the central axis of the pipe to the rotating arm
The distance between the center axis of the pipe and the center of rotation of the arm is the bending radius. At work, the tube is covered with a copper induction loop, induction loop through the medium frequency (for thicker tubes) or high frequency (for thin tubes) electricity will be partially heated to 900 ~ 950 ℃, and then bent. If the rotary arm active
Rotating the tube back to the bend forming known as the pull-bend type; if the end of the tube by the thrust, the tube to push the rotary arm to rotate, thereby realizing the tube back to the bend forming known as the push-bend type. Immediately after the inductor ring from the inside of a circle of small holes to the bent pipe section spray water, so that it cools quickly. The purpose of spraying water is to make the heating section and the deformation zone is limited to a very small range, thus preventing the tube from wrinkles and flattening.
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