What Is Pipe Bending?
Pipe bending is used to create components for many different applications. Roll bending is regularly used for large construction pieces. Three rolls are positioned as a pyramid and can produce a very specific radius. This type of bending can be used to produce spirals and continuous coils.
Curved pipes can be used on bridges, stairs and canopies, as well as machines in the agricultural and construction industries. Pipes can be bent with a consistent radius, with as little or as much an oval shape as required by the client. Pipes can also be bent on two planes, and multi-roll bending methods and rotary draw bending methods can be used.
How to bending pipe
Compression bending uses a roller or a compression die to bend the pipe around a die. It’s perfect for symmetrical pieces that have the same bends on each side.
Rotary draw bending is the most common type of bending in the industry for applications needing a tight radius. Wall thinning of the tube can be carefully controlled, while mandrels are used to maintain wall thickness.Rotary draw bending is the most common type of bending in the industry for applications needing a tight radius. Wall thinning of the tube can be carefully controlled, while mandrels are used to maintain wall thickness.
This form of bending generally is used for tighter radii in tube (typically 3D ie; the radius is 3 times the o/dia of the tube). It controls the flow of plasticizing material at the point of bend in order to maintain the shape of tube as it sets into the arc of the bend
If the tube wall is thick enough relative to the overall size of the tube or if the specifications are not too severe (e.g., shallow depth of bend or a large “D” bend radius), then a mandrel may not be necessary, because the force of the bend is not sufficient to buckle or collapse the tube wall at the point of bend. However, if the wall factor of a tube exceeds 20, a mandrel is needed in most instances. Barnshaws can mandrel bend tube up to 76mm diameter.
Mandrel for pipe bending
The key to effective use of the mandrel is to set its nose so that it supports as much of the point of bend as possible. This ensures that the vertical cross-section of the arc of the tube bend, while it is in a plastic state, will take the shape of the nose as the tubing material is drawn over it.
This plastic region of the tube bend extends both behind and ahead of the line of the tangency, therefore, the mandrel nose must be set forward of the line of tangency into the arc of the tube bend in almost all cases.
The limiting factor of this forward placement is the point where the outboard line of the mandrel intersects with the tube wall of the outside radius; in other words, the point where the mandrel nose would literally stick out past the bend.
The location of this point can be determined by formula developed from the Pythagorean theorem.
Generally it is advisable to locate the nose (excluding the nose radius) about the two-thirds of the distance between this point and the line of tangency.
This will allow for slight flattening of the tube’s cross-section at the outside radius, which unavoidably occurs because of the tension of the draw, without intersecting the mandrel nose.
Pipe bending and BIT hydraulic pipe bending machine
BIT hydraulic profile bending machine （ hydraulic pipe bending machine ） can specialize in rolling round tube and pipe in many different material types, such as aluminum tube rolling, stainless steel tube rolling, brass tube rolling, copper tube rolling, and plain steel tube rolling and bending.
Section bending machine roll all sizes of pipe from 3/8” to 24”. We work with almost all grades of carbon steel pipe and aluminum pipe, and can bend full and half pipe with equal quality and precision.
We has provided pipe bending machine (profile bending machine) for superior metal pipe bending, rolling, shaping industrial clients, be applicable a broad range of materials, pipe diameters, pipe schedules, and bending methods, meet applicable safety guidelines and industry standards, can roll pipe to multiple radii.
Because of its symmetrical nature, and method for the task—pipe can be bent to very consistent radii .
BIT pipe bending machine bending operations include compression bending, roll bending, and rotary draw bending. Material options include carbon steel, stainless steel, aluminum, copper, and titanium, and some special materials.
BIT provided pipe bending machine (profile bending machine) can perform rotary draw pipe bending to radii as tight as twice the diameter of the pipe—for example, 6” OD pipe can be bent to a 12” centerline radius. Pipe bending can also be performed across two planes, like the helical pipe used for handrails and stringers on circular staircases. Can also curve pipes to very large radii, a service that not all pipe bending machine can provide.
From the tightest bend to the broadest, our pipe bending processes produce little to no distortion or ovality.
BIT section bending machine roll all sizes of pipe from 3/8” to 24”. We work with almost all grades of carbon steel pipe and aluminum pipe, and can bend full and half pipe with equal quality and precision.
Steam, water & process systems
Ductwork & HVAC systems
Structural & architectural elements
Signage, displays & exhibits
Offshore & subsea flow lines & risers
Energy product transport & distribution
Power plants & refineries
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