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Metal bending is a sheet metal forming process where force is applied to shape materials like stainless steel, structural steel, or aluminum into specific angles, typically forming a “V” or “U” shape. This process produces bent sheet metal parts with permanent angles. Typical bending machines include press brakes, rollers, and other precision equipment.
There’s more than one way to bend sheet metal, and each method comes with its strengths. Some are great for tight angles, others for high volumes. Here’s a quick overview to help you find the right fit for your project.
This is a widely used method where the sheet metal is bent using a V-shaped die and punch.
Air bending is most widely used, leaving a gap between the sheet and die, allowing for more flexibility in bend angles.
The metal is pressed fully onto the bottom of the die, creating a sharp, defined bend and reducing spring back coining.
Coining uses extreme pressure to create very precise, clean bends, often used for small, intricate parts.
3ERP partner with trusted metal bending shops equipped with a wide range of bending machines, capable of handling everything from thin sheets to thick plates with high precision. Our facilities are equipped to meet the demands of most standard industrial applications. All parts receive full post-processing and are delivered ready for use. Explore our range of bending machines below to find the right tool for your project.
Our sheet metal folding services cater to a broad range of sheet and plate materials. Each material provides unique benefits in terms of shaping, strength, and suitability for different applications. We can recommend the best match for your project’s specific needs and applications.
CNC sheet metal bending is a manufacturing process where sheet metal is shaped into specific angles or forms using a computer numerical control (CNC) machine. This technique allows for precise and repeatable bending, creating parts with tight tolerances and complex geometries. Compared to traditional manual bending, CNC bending services offer greater accuracy, consistency, and efficiency, especially for complex designs or high-volume production.
The bend rule in sheet metal fabrication refers to a set of guidelines and formulas used to predict how metal deforms during bending. It helps ensure that final part dimensions are accurate by accounting for factors such as bend allowance, bend radius, material thickness, and bend angle. At 3ERP, our engineering team reviews your design for manufacturability (DFM) and offers expert guidance to optimize bending results.
General tolerances in sheet metal bending refer to acceptable variations in dimensions and angles during the forming process. While exact tolerances depend on material, thickness, and machine precision, typical values are:
Bend angles: typically within ±1° to ±2°
Bend line positions and flat-to-bend distances: commonly within ±0.5 mm
Bend radii: usually held to ±0.25 mm to ±0.5 mm
Hole-to-bend spacing: often controlled within ±0.5 mm
Overall part dimensions: ±0.2 mm to ±0.5 mm for small parts; up to ±1.0 mm for larger components
Bending is a forming process that reshapes a single sheet into angles or curves without cutting or joining.
Welding, on the other hand, is a joining process that uses heat to fuse two or more metal parts. It is excellent for constructing sturdy structures that bear heavy loads, though it might take more time and could change the metal’s surface or form because of the heat.
Which one you use depends on your part’s design, strength needs, and manufacturing goals.
Metal cutting and bending are closely linked and often combined in metal fabrication. Cutting comes first. Flat sheets or plates are precisely shaped and sized using methods like laser cutting, plasma cutting, or shearing to prepare the material for bending. Once cut, the pieces are formed into specific angles or shapes by applying force with machines such as press brakes or rollers.
