In sheet metal fabrication, laser-cut parts often need to go through another important process: press brake bending.
A flat metal sheet can be formed into L-shaped, U-shaped, box-shaped and other three-dimensional structures through bending. This makes press brake bending widely used for equipment enclosures, brackets, machine components and sheet metal structural parts.
However, sheet metal bending is not simply about “folding the sheet.”
Material type, sheet thickness, bend angle, inside radius, tooling selection and springback can all affect the final dimensions and angles.
So, how does press brake bending work, and what factors affect bending accuracy?
Press brake bending, also known as sheet metal bending, uses a press brake together with an upper punch and lower die to apply force to a metal sheet and form it into a required angle or shape.
In simple terms:
Flat Sheet → Bending → Three-Dimensional Sheet Metal Part
A flat metal sheet can be bent at different positions and angles to create equipment enclosures, brackets, machine components and other structural parts.
Press brakes are therefore an essential part of sheet metal forming.
Laser cutting is mainly used to create the required profile and hole positions in a flat sheet.
However, many machine components are not flat.
Equipment enclosures may require 90-degree bends, brackets may require multiple bends, and structural components may need several angles to form a three-dimensional shape.
A typical sheet metal fabrication process may therefore be:
Drawing Review → Laser Cutting → Press Brake Bending → Welding / Secondary Processing → Finished Part
Laser cutting and press brake bending are two important processes that work together in sheet metal fabrication.
Press brakes can perform single or multiple bends according to the part design.
Common sheet metal structures include:
For parts requiring multiple bends, the bending sequence, dimensions and potential interference should be considered before production.
The bend angle directly affects the final dimensions and assembly of a sheet metal component.
For example, if a component requires a 90-degree bend but the actual angle is outside the required range, it may cause:
Press brake processing therefore requires consideration of the drawing requirements, material properties and actual processing conditions.
Springback is an important phenomenon in sheet metal bending.
When a sheet is bent under pressure and the external force is released, the elastic properties of the material cause the bend to recover slightly. As a result, the final angle may differ slightly from the angle during forming.
This behavior is known as springback.
The amount of springback can be affected by material type, sheet thickness, bend angle and tooling conditions. Actual production settings therefore need to be adjusted according to the material and forming conditions.
Bending accuracy does not depend only on the press brake itself.
Common factors include:
Therefore, even for the same 90-degree bend, the actual processing conditions may need to be adjusted for different materials and thicknesses.
Press brake bending requires suitable punches and dies.
Tool geometry and dimensions affect the bending method, bend radius and forming force required for the operation.
For this reason, not every tool can be used for every sheet metal application.
The processing conditions should be selected according to the material, sheet thickness, bend angle and part geometry.
For high-mix, small-batch sheet metal production, proper tooling selection and setup are especially important. AMADA's HG series includes press brake systems designed for various-mix and various-volume production.
When a component requires multiple bends, the bending sequence becomes very important.
After bending, the part becomes a three-dimensional structure. An unsuitable sequence may cause interference between the machine, tooling and workpiece.
Before production, the following points should be considered:
This is one of the areas where practical sheet metal fabrication experience becomes important.
For parts requiring press brake bending, engineering drawings should clearly define the relevant dimensions and requirements.
Common information includes:
If only a 3D CAD file is available, it can also be provided to help the fabricator evaluate the part structure before confirming detailed manufacturing requirements.
For complete sheet metal fabrication, laser cutting and press brake bending are often connected as sequential processes.
For example, an equipment bracket may require:
Laser Cutting → Edge Processing → Press Brake Bending → Welding → Surface Treatment
When one fabricator can handle multiple processes, procurement and engineering teams may reduce communication and coordination between different suppliers.
Chuangpu Technology is located in Fengyuan, Taichung, Taiwan and provides sheet metal fabrication, laser cutting, press brake bending, sheet metal welding and 2D/3D sheet metal design.
Our facility is equipped with multiple AMADA press brakes for different part sizes, sheet thicknesses and bending requirements.
From laser cutting to press brake forming and subsequent welding, Chuangpu Technology provides integrated sheet metal fabrication services.
Our applications include machine tools, equipment manufacturing, automation equipment and semiconductor equipment.
Yes.
Sheet metal fabrication does not always require large production quantities.
For new product development, equipment modifications, mechanical design verification or component testing, single-piece prototypes and small-batch production are common requirements.
Testing the bending dimensions, angles and assembly condition with a prototype before mass production can help reduce the risk of later modifications.
If you only need one piece or a small quantity, you can still provide the drawings and fabrication requirements for evaluation.
When requesting a press brake bending quotation, it is recommended to provide:
The more complete the information, the easier it is for the fabricator to evaluate the manufacturing process and quotation while identifying potential fabrication issues at an early stage.
Chuangpu Technology provides integrated services from drawing review and laser cutting to press brake bending and sheet metal welding.
We support single-piece prototyping, small-batch production and batch production according to customer drawings and equipment requirements.
If you are looking for press brake bending in Taichung, sheet metal fabrication in Fengyuan or custom sheet metal bending, provide us with your drawings, material, sheet thickness, quantity and fabrication requirements.
Have the drawings? Let's talk.