sheet metal bending process

Sheet Metal Bending Parts Supplier

KDM has a wide ability to manufacture sheet metal bending parts based on your requirements. Different bent parts can be used in the aerospace industry, medical, defense, and electronics.

KDM Sheet Metal Bending Parts

Sheet metal bending parts are components processed through numerous bending techniques. It includes air bending, rotary bending, roll bending, three-point bending, folding, wiping, elastomer bending, and joggle bending. Each part is precisely bent to meet specific applications.

During the bending process, we used numerous high-end sheet metals. We pick stainless steel, brass, copper, carbon steel, aluminum, and specialized alloys. All of them are strictly inspected to ensure durability, long life service, and high corrosive protection.

However, our finished sheet metal bending parts can be used in the defense/military industry, medical, energy, aerospace, or custom projects. So, if you are one in these industries or you have projects that require these components, KDM got it all for you! All bent parts are guaranteed to have exact shapes and excellent polish.

Allow KDM custom sheet metal bending parts for your business and projects!

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Sheet Metal Bending Parts Series

Brass Precision Parts

Brass has the highest zinc content suitable for precision parts. The brass precision parts are performed through bending and deep drawing.

Copper Auto Parts

KDM copper auto parts come with a variety of alloys, sizes, and shapes. It can be available in numerous surface treatments such as chrome plating.

Galvanized Iron Parts

The galvanized iron parts provide many benefits to your applications. It can provide durability, formability, high strength, and corrosion-resistant.

Stainless Steel Parts

KDM performs the bending process for different stainless steel parts. It is widely utilized in aerospace, marine, medical, construction, and other industry.

Steel Bending Parts

Steel bending parts are strong and reliable components for OEM and construction purposes. We provide a wide range of steel grades suitable for the bending process.

Aluminum Bent Parts

The aluminum bent parts are made from different aluminum alloys. Mainly are aluminum alloy 3003, 5052, and 6061. They have excellent formability and bend radius.

6 Products Found.

Sheet Metal Bending Part Features

Corrosion Resistant
Corrosion Resistant

From small up to large bending parts, all are totally corrosion-resistant. No worries when you need them for outdoor installations.

Low Cost
Low Cost

We offer custom bending parts at lower costs. Since made from reasonable yet quality sheet metal that is why they are offered affordably.


We made custom bent parts from sheet metals. They have high accuracy designs, suitable for automotive industry, commercial, or electronics.


All custom designs have weather-proof properties. They have better quality and can withstand rainy days or even long sun exposure.

Sheet Metal Bending Methods

There are many techniques to bend sheet metals. Several needs force, heat, or combinations of these methods. Frequent bending methods include:

  • Air bending, bottoming, and coining: It uses a press brake machine for precision.
  • 3-Point bending: Generated by servo motors and niche.
  • Rotary bending: Used for controlling delicate or pre-colored surfaces.
  • Coil bending: A technique used for creating curves.
  • Elastomer bending: Ideal for non-destructed bends on sensitive materials or finished surfaces.
  • Joggle bending: Used for balance bends.
Sheet Metal Bending Methods
Sheet Metal Material Choices

Sheet Metal Choices

In choosing the right material, its thickness is the most important point to consider. The thinner the sheet metal, the easier to be curved and bent,  While if it’s too thick, then it has weak ductility and will need heat treatment before bending.

The most suitable sheet metal to use in the bending operations include stainless steel, aluminum, brass, carbon steel, mild steel sheets, copper, specialized alloys, and mild brass sheets.

Products and Industries

KDM sheet metal bending parts has numerous purposes across industries, including industrial and ductwork systems, architectural industry, machine parts, military/defense industry, medical, aerospace, electronic, energy, or custom projects.

We offer different types of custom bent parts. It includes aircraft parts, automotive body components, structural/architectural parts, white goods, utensils, brackets design, furniture parts, construction sheet metal parts, and so on. Therefore you don’t need to worry about the right components for your projects, KDM has it all.

Products and Industries

About KDM Capabilities

sheet metal bending in china factory
stainless steel sheet metal bending part

KDM is committed to supplying accurate sheet metal fabrication and final parts. All final bent parts are strictly manufactured based on your specifications and design needs.

However, we work with a wide variety of materials, including stainless steel, aluminum, mild steel, and more. We make sure every custom bent part is made with extremely tight tolerances.

As a full service supplier in China, we can manage a broad lineup of sheet metal bending fabrication projects from the very beginning –creating designs up to the finishing stage.

Our factory is back up with fully automated machines and engineering systems, with abilities to control small & large production operations. And also, thanks to our multiple certified engineers and welders. They help us fully capable of producing rapid services and consistent bending parts.

For your next projects, allow KDM to assist you.

KDM: Sheet Metal Bending Parts Manufacturer

Sheet Metal Bending Parts Finishing

Together with our professional team, KDM offers services from the very first step of designing up until the final step –which is, the custom finishing stage. We are honored to present a skilled and experienced team of finishing professionals. They are also masters in operating the automated paint line and powder coating process.

We work with many different finishing services, including:

  • Powder coating
  • Sheet metal part finishing
  • Liquid painting
  • Screen printing
  • Paint finish engineering
Applications of Bent Sheet Metal

Sheet metal bending is one of the most important processes in the metal fabrication industry. It is also essential in automotive sectors since they operate with multiple shapes to achieve the perfect vehicle components. The custom bending process can create big engine parts in this industry.

Nevertheless, they can also be practical operations in producing small components, which are used as better replacements for worn-out or damaged engine parts.

While there are several operations involved in the process, all sheet metal bending techniques are standard methods to guarantee accuracy beyond their fabrication.

Custom Bending Parts Applications

Appliances Parts
Appliances Parts

All appliances parts we offer are durable, break-resistant, corrosion-protected, and have an aesthetic finish. They are widely used in residential, construction, and commercial industries.

Architecture Tool Parts
Architecture Tool Parts

Architecture tool parts made from bent sheet metals are most malleable, shiny, hard, malleable, and offer excellent thermal/electrical voltage. They can be exactly bent according to your requirements.

Automotive Parts
Automotive Parts

We bend different automotive parts into channel forms, V-shapes, and U-shapes. All car parts have excellent mechanical characteristics, high durability, and are featherweight.

Roofing Parts
Roofing Parts

We offer complete roofing bent parts:  metal panels, underlayment, closures, fasteners, and clips. All have good quality, are corrosion-resistant, weather-resistant, and fireproof.

Airplane Parts
Airplane Parts

Available airplane parts are fuselage, wings, cockpit, propeller, tail, and more. They can be made from special steel and other bending sheet metals. All parts are more durable and stronger –made to resist extreme wind pressure.

sheet metal bending parts
KDM - Sheet Metal Bending Parts Supplier in China

We are your reliable custom bending parts supplier in China. We can assist you in your business import needs.

  • “KDM team is easy to work with our urgent sheet metal bending parts orders. They are client-friendly and answered all my queries. And upon receiving all orders, we are very satisfied.”

  • “The sheet metal bending parts we received have excellent and satisfying quality. They are very durable and have the outstanding surface exterior design. Perfect for our upcoming projects.”

  • “KDM is a reliable business supplier when you are planning to import sheet metal bending parts from China. They provide outstanding services and satisfying quality bent parts. Highly recommended!”

Sheet Metal Bending Parts: The Ultimate Guide

I know you would like to learn various techniques about sheet metal bending parts.

Of, you are looking for sheet metal bending components.

Whichever the case, this guide has all information you are looking.

Let’s dive right in:

What is Sheet Metal Bending?

A process whereby you bend a metal sheet by applying weight that results it to bend and create the needed shape.

sheet metal bending parts

sheet metal bending part

Sheet Metal Bending Methods

Air bending, bottom bending, coining, three-point bending, folding, wiping, rotary bending, roll bending, elastomer bending, joggling.

Air Bending

Consists of upper die and bottom die, utilizes principal of pressing punch into metal sheet and force it to bottom v-die.

Then punch creates a bend in metal sheet which has characteristics of having a great distance between punch and side wall of v compared to thickness of material.

Air bending

Air bending

You utilize a v-shaped bottom die or square shape bottom die the reason is that it needs less bending force.

Others have adjustable tools or dies and you can utilize single set of top and bottom tools and change force depth.

And by using this you will see that by every different profile there is a very distinct product that is fabricated.


Advantages of air bending is when it comes to flexibility as different material and thickness is conformed in different bending angles.

Another one is that you only need less tool changes and this helps to give out a very high productivity rate.


The disadvantage is that there is no accuracy cause the metal sheet does not stay in contact fully with the dies.

Defects in components are formed because of the different thickness of the material and wear on tools are another cause.

It depends on the characteristics on the material, there results an over bend just to compensate for the spring-back.

Air bending doesn’t need bottom die to have exact radius as punch and radius bend is determined by elasticity of material.

Because it has flexibility qualities and usage of low pressure to help in bending, these qualities has made it popular method.


This method forces the metal sheet against the v shaped bottom tool opening, the u shaped opening can’t be utilized.

It differs from air bending by radius among the two methods space is left between sheet and bottom v opening.



Larger radius bend need same force of bottoming but smaller radius needs grater force of up to five times than air bending.


You get greater accuracy and les spring-back when utilizing tooling thus being very safe choice on metal sheet bending methods.


Different tool set is required for every angle bend, thickness of metal sheet and the kind of material also determines.


This is a bending metal where punch and work piece bottom on die gives a controlled angle that leads to little spring-back.

The difference between bottoming and coining is that there is more pressure needed in coining that air bending or the bottom bending.



These technique cause a permanent deformation through the metal sheet and this also has no or just a little spring-back.

Coining produces inside radius of as little as even 0.4 material thickness, with a 5 material thickness width of the v opening.


Coining method provides accuracy in radius and width of the sheet material thickness and replicate more of them as much as required.

The spring back with utilization of this method is usually low as the metal usually remain in the permanent deformation made.


Because of high radius precision and accuracy, it is of high cost and this leads to it not being utilized often.

Three-point Bending

This is a process whereby we utilize a die with an adjustable height bottom tool that is moved by servo motor.

The deviations in metal sheet thickness is accompanied by hydraulic cushion which also assists in adjusting between upper tool and ram.

This method usually achieves bend angles of 0.25 degree with accuracy, it entails flexibility too and is of a very high cost.

Three point bending

Three point bending

Tools of three-point bending are very few that are readily available and is utilized commonly in the markets of high value.


This involves clamping beams holding longer part of the sheet then it rises and folds the sheet around a bend profile.

The bend beam usually moves sheet down or up and then permits the manufacturing of components with negative and positive angles.



It is mostly an automated operation process and it handles large sheets with small risk of damage to surface of sheet.

The resulting bend angle is caused by the folding angle beam, geometry tool and also the characteristics of the material.


In these method longs end of metal sheet is clamped then tool moves up and down bending sheet around the bend profile.

It is faster compared to the folding but has a high risk to produce scratches on or damage the metal sheet.



This method helps to prevent spring-back by typically coin material to set edge, the bottom radius determines final radius bending.

Rotary Bending

This is similar to wiping but the top die is created of a free rotating cylinder with final formed shape cut into it and a matching bottom die.

On contact with metal sheet, the roll contacts on two pints and it rotates as the forming process bends sheet.

Rotary bending

Rotary bending

Roll Bending

This method actually creates a curve into a plate work piece or metals just ensure that there is proper pre-punching allowance.

Roll bending

Roll bending

Elastomer Bending

This method has v bottom die replace as a flat pad or rubber, such that punch creates part and rubber deflects.

After the rubber deflecting or urethane and then allows the material or metal sheet to actually form around the punch.

The rubber wraps the material around the punch and then bend radius become close to the actual radius on the punch.

It gives non-marring bend that is suited for pre-painted materials this is good advantage to this method compared to others.

It has special punch known as radius ruler with area on urethane, it bends more than 180 degree with a single press.

They are costly and need tonnage that is same to bottoming, coining and doesn’t do well on irregularly shaped things.


This where two opposite bends with equal angle are formed in a single action forming an s-shaped bend profile and offset.

Offset is one material thickness to enable lap joint where one edge of sheet matter is places on top of other.

Sheet Metal Bending Machines

Some of the most common machines you can use during sheet metal bending are:

Box and pan

Brake presses

A bar folder

A cornice brake.

Box And Pan Brakes

This is also known as figure brake, clamping bar has several removable blocks, which are removable and arranged to allow bending.

It enables or allows bending of the restated places of the piece of metal sheet or pieces that are partially formed.

box and pan brakes

box and pan brakes

After this procedure, pan and box form is completed by tools like screws, soldering, welds, rivet and other metal fixing process.

Benefits Of Box And Pan Brakes

It is made of stainless steel which gives it durability and strength to ensure long preserving or the long life shelf.

Machine body or structure helps to fulfill requirement for superior and effortless gadget in factory of metal sheets to perfect alignment.

It’s easy and simple to operate and has less moving components and structure design is simple but advance to make bending easier.

It needs less energy or effort in bending the sheet metal consists of hand-turn knob that you can adjust on process.

This gadget performs sheet bending process easily with less effort and because of accurate fitted castings.

Gadget is utilized set by either an experienced technician or an amateur laborer as it is smooth and easy to adjust.

The wide variety of settings are available for adjustability to enable the creation of a precise metal shape that is desired.

This gadget precisely allows you to customize your sheet metal piece easily into which ever shape you desire or even need easily.

It is accurate and precise brake when bending sheet metal and mostly utilized to help achieve best results.

Bar Folder

This is a very simple brake system that is smaller compared to other brakes like cornice or box and pan brakes.

It’s a single handle that clamps work piece and create a bend in one motion but depth is less than other brakes.

bar folder

bar folder

Press Brake

This is a complex gadget brake system that creates or forms a predetermined bends by clamping work-piece between a matching punch and die.

 press brake

press brake

Cornice Brake

Simple gadget bending metal sheet commonly utilized , it hold sheet metal to flat surface and utilizes bending leaf to  straighten bends.

cornice brake

cornice brake

Bending Radius

This is minimum radius one can bend a pipe, tube, metal sheet, cable or hose without scratching or damaging it or reducing lifespan.

It’s calculated with the formulary of minimum bend radius = cable outer diameter multiply by multiplier.

The smaller the radius, the more long life or durable the material has to prevent damage to the metal sheet that is bent.


It helps to ensure that standard performance quality to support the innovation of technology and give out superior accepted gods globally.


K-factor is ratio of neutral axis to the matter thickness, during compressing of metal the inner part compresses while outer expands.

The neutral axis is the transition area between expansion and compression where no material change occurs expect movement from original location.

It moves usually by fifty percent of the material thickness towards the inside surface of bend, it doesn’t change its length.

Because of this results is usually an elongation of material during bending, shift of neutral axis depends on properties of material.


It is the base value or mathematical constant required to calculate the allowance of the bend and the bend deduction ultimately.

It is actually a mathematical multiplier that enables you to locate the moved or repositioned netralaxis of the bend after creating.

After being developed value you find of k-factor will help you to predict the total number of elongation occurring in bend.

K-factor enables you to calculate the allowance of bend, outside set-back, bend deduction and flat layout of precision part your creating.

Important to designing accurate sheet metal products as it enables anticipation of bend deduction for various angle with no rely to charts

Sheet Metal Bending Parameters

Mold Line Distance

Is metal creating process where you apply force to sheet metal to make it bend at angle and form wanted shape.

Bend Line

This is a straight line on sheet that is on which-ever side of bend, this describes level flange end and bend start.

Outside Mold Line

Straight line where exterior surfaces of two flanges meet and are to continue, describes edge of mold that bound bent sheet metal.

Flange Length

This is length extension of two flanges that actually extends just from the edge of the sheet to bend line.

Mold Line Distance

This is actually the distance from the sheet end to the exterior or outside of the mold line on either side.

Set Back

This is the distance from bend line to outside mold line, its equal to difference between mold line and flange length.

Bend Length

This is measured along the bend axis, it’s also the bend length.

Bend Radius

This is the distance from axis to interior of the metal between bend line, also known as inside bend radius.

The exterior or outside bend radius is usually also equal to the interior bend radius together with the thickness of sheet.

Bend Angle

This is an angle that you measure between bent flange and the original position or as included angle between perpendicular lines.

Bevel Angle

This is a complementary angle to the bend angle.

Bend Allowance

Length of neutral axis between bend lines when you add this to flange length it is equal to total flat length.

Bend deduction

Amount piece of metal is stretched by bending, its value equals difference between mold line, length and total flat length.

Another name is bend compensation.

Sheet Metal Bending Materials

Carbon Steel

This is the most commonly-bent matter because of its properties of complete flexibility, strong and very reliable for component for fabricating purposes.

carbon steel

carbon steel

Because of its varying grade it gives a big variety of options things like bending, machining and also wear resistance too.

Alloy Steels

These are utilized in raising hooks and grab bars and U-bolts.

These steels give high performance are corrosion resistance have high strength and very durable and able to survive harsh conditions.


Aluminum is good conductor of electricity and utilized in transmission of electricity lines it is cheap and important in airplane construction.

Utilized in transportation and storage tanks.


It is more malleable than zinc or copper, corrosion resistant and has a low melting point and is utilized in hand rails and marine applications.

Other uses include musical instruments, plumbing, decoration valves, locks tools and fittings utilized around explosions.

Carbon Alloys

Carbon Alloys

Are matters composed mainly of atoms of carbon in multi-component systems where components contain chemical or physical relation with another.

Utilized in general building and construction.


These is very ductile metal that is good electricity conductor and also heat, its usually in free metallic state in nature.

Sheet Metal

This is a versatile metal that is utilized widely when it comes to construction material, and in every industry that’s applicable.

This mater has a properties of low weight to thickness, this makes it very easy to move and work with easily.

Sheet metal is actually very strong and has durability, this enables it to be utilized in variety of different industry applications.

Another advantageous properties is that it is malleable, this allows it to be conformed, bent, cut and stretched into desired shape.

These enables you as manufacturer to give out to your customers’ customs design and specialized solution to meet just any specifications.

Sheet metal is easily repaired and this enables it to be the first practical choice when it comes to various industries.

It’s also very cheap when it comes to cost, it’s an advantage when you need small and large quantity for fabrication.

Sheet Metal Bending Allowance

This is material needed to add overall length of the sheet metal so that you cut it precise size desired.

When you bend sheet metal, it gets bigger, to having larger dimensions than flat metal, unless you consider exterior metal dimensions.

The formula to get bend allowance is

BA=A /pie/180(R+KT)

BA- bend allowance

A-bend angle  degree

R-inside bend radius in m


T-material thickness in m.

Sheet Metal Bending Parts From Different Industries

Military Industry

Components for armored vehicle and offensive weapon warships.


Customized hospital beds, intricate equipment utilized during surgeries, sterilization cases for the orthopedic department, physical therapy equipment, robotic blood sorting systems.

Custom medical carts utilized in all medical fields like cardiology, neurology and ophthalmology.


Aircraft engine nacelles, bulk heads, heat shields, ducts sections, and engine components, also some spacecraft parts like thermal shield and fuel system.

Sun reflective treatment, thermal insulator ventilation brackets, roof for electrical enclosure support rails, water proof seal, assembly frame, pivot frame rack support.

Tips For Sheet Metal Bending

Quality checking, ensure you get the right material for bending, utilize bend allowance, spring-back, utilize a brake, metal grain direction, utilize heat for the thick metal sheets to bend easily, protect the exteriors.

More Resources:

Sheet Metal Blanking

Sheet Metal Welding

Sheet Metal Deep Drawing

Sheet Metal Laser Cutting

Sheet Metal Stamping Parts

For all your sheet metal bending parts, contact us now.

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