Shenzhen Prolean Technology Co., Ltd.

CNC Machining


Sheet Metal Bending

Bending is a common sheet metal fabrication process which finds use in almost all industries that use sheet metal fabricate parts. Industries that work with sheet metal or use sheet metal parts need bent geometries in one way or the other.

Prolean offers accurate angles with bending services. Our veteran engineers and advanced brakes and presses ensure quality bent parts at your end.

Quality Assurance

Quality Assurance

Competitive pricing

Competitive Pricing

Timely Delivery

Timely Delivery

High Precision

High Precision

Sheet Metal Bending

Bending is as simple as the name sounds. A machine bends a sheet of metal along a straight axis and creates U, V, or channel shapes. Bending finds use in the manufacturing of casings of electronics, panels for automobiles and airplanes, construction parts and other similar applications in other industries.

How Does Bending Work2
Our Strength2
Our Strength

Bending is a metal forming process so there is just shape change without any material removal for achieving final form.

Quality Assured:

Dimension Reports

On-time Delivery

Material Certificates

Tolerances: +/- 0.1mm or better on request.

How Does Bending Work?

Fabricators use machines called press brakes for sheet metal bending. The process begins by placing the sheet metal on the machine. Once the sheet is in the right position, the machine uses force to bend the metal using mechanical, hydraulic, or pneumatic systems. Due to the elastic nature of metals and stresses in bent sheet metal, when the machine releases a part the bend angle reduces a little due to the springback effect.

The sheet has to be over-bent by a certain angle to account for this effect and achieve accurate angles. The shape of the bend and angle of the bend depend on the material and design. Bending usually doesn’t require any further work after coming out of the machine and the part goes for the next machining process or to an assembly line.


Advantages of Sheet Metal Bending

Rolean’s sheet metal bending services offer the most accurate angles and best part quality. With our modern brake presses and experienced engineers, the results are always close to perfect.

Our broad range of materials allows you to choose quality sheet metals that work best for your applications and have strength to take the application loads. We do manufacturability checks and offer design help when required to make sure complex parts have optimum design and efficient production.

What Materials Are Available For Bending?

Aluminum Steel Stainless Steel Copper Brass
Al5052 SPCC 301 101  C360
Al5083 A3  SS304(L) C101  H59
Al6061 65Mn SS316(L)    62
Al6082 1018      



Prolean offers a wide variety of materials for Sheet Metal Bending. Please see the list for a sample of the materials we work with.

If you require material not on this list, please do get in touch as it is likely we can source it for you.

As Machined

Our standard finish is an “as machined” finish. It has a surface roughness of 3.2 μm (126 μin). All sharp edges are removed and parts are deburred. Tool marks are visible.


A finishing CNC machining operation can be applied to the part to reduce its surface roughness. The standard smoothing surface roughness (Ra) is 1.6 μm (64 μin). Machine marks are less evident but still visible.


Brushing is produced by polishing the metal with grit resulting in a unidirectional satin finish. Not advisable for applications where corrosion resistance is required.

Passivation part


Passivation is a treatment method to protect the metal from corroding, it generates a more uniform formation of a passive surface that is less likely to react with air and cause corrosion chemically.

Anodizing hardcoat

Type III anodizing provides excellent corrosion and wear resistance, suitable for functional applications.



Electropolishing is an electrochemical process used to polish, passivate and deburr metal parts. It is useful to reduce surface roughness.

Chromate conversion coating


Chromate conversion coating(Alodine/Chemfilm) is used to increase the corrosion resistance of metal alloys while maintaining their conductive properties.

Bead blasting

Bead blasting adds a uniform matte or satin surface finish on a machined part, removing the tool marks. This is used mainly for visual purposes and comes in several different grits which indicate the size of the bombarding pellets. 


Powder coating is a strong, wear-resistant finish that is compatible with all metal materials and can be combined with bead blasting to create parts with smooth and uniform surfaces and excellent corrosion resistance.

Black Oxide

Black Oxide

Black oxide is a conversion coating used to improve corrosion resistance and minimize light reflection.


Here is a list of standard surface finishes. For custom surface finishes or other surface finish options, please check our surface treatment service

Choose The Right Finish For Your Material

Different surface finishes can be applied to different materials. Find below a quick cheat sheet of surface finish and material compatibility.

Name Material Compatibility
Smooth machining (1.6 Ra μm/64 Ra μin) All plastics and metals
Bead blasting All metals
Powder coating All metals
Anodizing clear (type II) Aluminum alloys
Anodizing color (type II) Aluminum alloys
Anodizing hardcoat (type III) Aluminum alloys
Brushing + Electropolishing (0.8 Ra μm/32 Ra μin) All metals
Black oxide Stainless steel and copper alloys
Chromate conversion coating Aluminum and Copper alloys
Brushing All metals

Ready To Quote?

If the Material and finishing you need are not one of the above, please feel free to contact us for more available.