Sheet metal can be bent at different angles. This is a method of plastic deformation of the sheet, which preserves its structure and eliminates the need for additional welds.
In industrial settings, bending and profiling are used by various factories and enterprises. In such conditions, it is not limited to thin sheet metal. For example, sheets with a thickness of 200 mm or more are used for wind turbine towers.
Bending Technology
Bending is based on applying mechanical forces of a certain magnitude to one or more areas of the metal. Such deformation allows the creation of products with complex configurations. The final result is influenced by the amount of force, sheet thickness, bend angle, bending speed, as well as the metal's plasticity.
In industrial settings, this deformation is performed on specialized equipment.
- Radius bending – used to create cylindrical or conical parts;
- Multi-angle bending – used to obtain products with complex shapes;
- Single-angle bending – used to create parts with one bend;
- U-shaped bending – a variation of multi-angle bending.
Manual Bending Methods
It is worth noting that this method can only bend material up to 1.5 mm thick. Standard bench vises can be used for this. A piece of sheet metal can be clamped on a workbench using clamps. A rubber mallet or pliers may also come in handy. For thicker products, a hammer, sledgehammer, or other hand tools will be needed.
To align the desired angle, it is recommended to use a wooden block.
Bending with a Press
Deformation on this equipment is based on the principle of pressing using a punch into a die cavity located on the lower traverse. This method allows bending sheet material of a specific configuration.
To obtain a certain shape, a press mold must be installed.
Bending with a Hydraulic Press
Parts are obtained by pressing the sheet with an upper knife with a wedge-shaped working surface into a die that has a V-shaped groove. This allows bending the workpiece at the desired angle along one or more lines.
The hydraulic drive creates high deforming loads, so this method can be used to process thick sheet metal.
Bending with a Sheet Metal Bending Machine
This equipment allows bending a sheet into a pipe or cone of great length. Rolls and rollers of various diameters are used as working tools.
How to Prepare the Metal
Great attention should be paid to the selection of metal. Sheet metal must be free of scale, rust, various contaminants, and hard inclusions.
The alloy grade must meet the requirements for the final product. If necessary, the edges of the sheet should be processed, as the material must not have burrs, cracks, or bends. The edges can be straightened or trimmed.
It is also necessary to measure the dimensions of the sheet and mark the bending line.
Another essential requirement is degreasing the workpiece. In industrial settings, it is mechanically cleaned using shot blasting and jet cleaning machines.
Bending Metal by Hand
Alloys such as aluminum, copper, brass, and low-carbon unalloyed steel can be processed this way. This is a labor-intensive process that requires care and attention.
Tools needed include pliers, a hammer, and a mallet.
How to Bend a Sheet into a Pipe
The first method involves using a mandrel, such as an old pipe of the appropriate diameter. One edge of the sheet is clamped on the mandrel using a vise. The bending process involves gradually tapping with a rubber mallet from the clamping point to the free edge. This method allows for minimal-cost production but in small quantities.
Radius bending – this metal deformation process is performed using a manual rolling machine and is quite common in everyday use. The machine is easy to operate and can be used without special knowledge or experience. A sheet no thicker than 2 mm is placed between the rollers. The result is a cylindrical product.
To bend a sheet at an angle at home, you will need pliers and a mallet. This method can bend metal up to 0.2 mm thick. The piece of metal to be bent is clamped with pliers. The working ends of the tool should be positioned a short distance from the bending line. The tool is gradually moved along the bend, and the edge of the metal is bent upward. To straighten the angle, use a hammer and a wooden block.
Features of Bending Different Metals
Aluminum has good flexibility, so products made from it are created using free bending. In this case, the bend radius can exceed the sheet thickness. The problem is that it is quite difficult to achieve precise dimensions, so the parts are calibrated on specialized equipment.
Copper is plastic and therefore relatively easy to deform. The integrity is not compromised at the bend, so copper alloys are widely used for products of varying complexity.
Brass bends best on presses, with a thickness of no more than 4 mm. Before deformation, heat treatment is recommended.
Galvanized sheets are bent using free deformation or rolling. This method minimizes the impact of the working tool on the zinc layer. It can be bent on any type of equipment. When processing products up to 4 mm thick, the bending features and requirements for the final product shape should be considered.
Practical Tips
As mentioned earlier, in home conditions without specialized tools, sheets up to 0.5 mm thick bend best. If you don't know how to bend, check whether the profile of the deforming tools matches the bend configuration. The metal's plasticity can be increased through heat treatment, and the bending process can be performed on sheets in a heated state.
The company "UTMK" offers a wide selection of sheet metal products for your needs. All necessary information can be obtained from the sales department. Contact us, and our managers will help you make the right choice.
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