Sheet metal working in industry

Industrial sheet metal working is essential for almost every technical sector. Mechanical engineering, automation, conveyor technology, electrical engineering or plant construction – everywhere, components are created that require high dimensional stability, precision and repeatability. Sheet metal is one of the most flexible metallic materials, as it can be both precisely cut and complexly formed. Modern manufacturing technologies such as Laser online or high-precision waterjet cutting make it possible to produce components in the shortest possible time, with tight tolerances and gentle processes.

Companies benefit from the combination of speed, high material availability and the possibility of realising almost any geometry – from simple cut pieces to complex functional components.

Fundamentals of sheet metal working

Sheets are used in thicknesses from a few tenths of a millimetre up to several centimetres. Depending on the field of application, steel, stainless steel or aluminium are used. Important parameters are:

• Material thickness: influences cutting processes, bendability and distortion.
• Alloy: determines strength, formability and surface quality.
• Strength/yield point: relevant for bending and deep drawing.
• Corrosion behaviour: important for housings, covers and outdoor use.

Sheet metal working covers all steps from cutting, bending, forming, drilling, milling through to final assembly of assemblies.

Key processes of sheet metal working

Industrial sheet metal working covers a large number of specialised manufacturing processes, which are selected specifically according to material, component geometry and precision requirement. Each process has its own strengths – from fast, economical laser cutting through material-gentle waterjet cutting to complex forming processes such as deep drawing. To ensure the highest component quality and reproducible results, several processes are often combined in practice. The following technologies form the foundation of modern industrial metal manufacturing.

Laser cutting

Laser cutting has established itself in modern industry as one of the most precise and flexible processes. A focused laser beam melts or vaporises the material with pinpoint accuracy, thus enabling even the most complex contours with the finest radii. The heat-affected zone is smaller than with many other thermal processes, whereby distortion and material stresses are minimised. Particularly with thin and medium sheet thicknesses, laser cutting delivers excellent cut qualities and smooth edges that only rarely need to be reworked.

Thanks to digital control and high repeatability, the process is suitable both for individual parts and for large series. In the industrial environment, the option of Laser online is increasingly used: designers upload their drawings, select material and sheet thickness, and receive precisely cut sheet metal parts within the shortest possible time.

Waterjet cutting

Waterjet cutting differs fundamentally from laser cutting, as it works completely cold and exerts no thermal influences whatsoever on the material. An extremely thin jet of water and abrasive particles cuts the material with enormous precision – even with materials that would react to heat or are built up in several layers. As a result, the process is particularly well suited to stainless steel, heat-sensitive alloys, composite materials or thick sheets that would show a stronger heat-affected zone when laser cut. The cut edges are absolutely clean and burr-free, so that hardly any reworking is necessary. Even high material thicknesses can be separated without difficulty, without the structure changing or internal stresses arising.

Punching technology

Punching technology is a classic but still indispensable process of industrial sheet metal working. Through the use of high-precision tools, contours are separated from the sheet with one stroke. The process is extremely economical as soon as large quantities are involved, since each part is exactly reproduced with a single tool operation. For more complex requirements, progressive die tools are used, which combine several processing steps – such as punching, embossing, perforating or forming – in a single machine. This high efficiency makes punching an indispensable part of manufacturing, particularly in automotive engineering and in the mass production of sheet metal parts. The tool costs are higher at the outset, but amortise quickly for larger series.

Bending

During bending, a flat sheet acquires its geometric structure through targeted forming. The sheet is clamped between punch and die and bent under pressure into the desired angle. Material springback plays a central role here, since every material – depending on alloy, thickness and structure – springs back slightly after forming. Modern press brakes measure angle and shape in real time during the process and compensate for springback automatically. This ensures very high repeatability, even with complex housings or long bends. The quality of the bending operation decisively determines how exactly components can be assembled with one another, since even slight angle deviations influence function and fit.

Deep drawing

Deep drawing is a demanding forming process in which a flat sheet is formed into a three-dimensional, deep component. The material is pressed into a die by a punch, whereby the structure changes permanently. Special deep-drawing grades are necessary for this process, which exhibit high elongation and low susceptibility to cracking. The process is ideally suited to the production of housings, containers, cover hoods or technical protective components. At the same time, tool geometry, material properties and lubrication must be precisely coordinated with one another in order to ensure an even wall thickness distribution and clean drawing behaviour. Deep drawing is one of the processes that require particularly a great deal of know-how and experience.

CNC milling for sheets

CNC milling complements cutting and forming processes when additional precision or functional elements are required. Laser parts or waterjet cut pieces are often subsequently milled in order to introduce fits, countersinks, threads or functional surfaces. Aluminium in particular is outstandingly suited to the combination of cutting and CNC machining due to its good machinability. Milling enables tolerances in the hundredth range and is indispensable for components that are later used in complex assemblies. In industrial manufacturing, this combination is frequently used, as it combines high flexibility with precise further processing.

Laser or waterjet? – A direct comparison

Criterion	Laser cutting	Waterjet cutting
Working principle	Thermal separation process with focused laser beam	Cold separation process with high-pressure water and abrasive
Cut quality	Very smooth, fine contours, little reworking	Absolutely burr-free, no thermal influence
Material compatibility	Ideal for steel, stainless steel, aluminium	Ideal for heat-sensitive metals, composites, thick sheets
Heat-affected zone	Low, but present	None – material remains unchanged
Material thickness	Optimal with thin to medium thicknesses	Optimal with high thicknesses and difficult materials
Precision	±0.1 mm possible	< ±0.1 mm possible, depending on setup
Speed	Very fast, ideal for series	Slower, but maximally gentle
Cost structure	Inexpensive for series & standard geometries	Ideal for one-offs & special materials
Typical application	Housings, brackets, series components, thin sheet	Precision parts, thick sheets, composite materials

Material selection in sheet metal working in sheet metal working

• Aluminium: Light, corrosion-resistant, easy to form and ideal for precise cut pieces, housings and applications in lightweight construction. Aluminium alloys such as EN AW-5083 or AlMg3 offer a very good combination of stability and machinability.
• Stainless steel: High strength, outstanding corrosion resistance and visually high quality. Stainless steel is particularly suitable for machine cladding, food technology, medical technology and components with high hygiene requirements.
• Steel: Economical, robust and versatile. Ideal for load-bearing constructions, machine components and components with high mechanical loads. Common grades such as S235 or S355 offer a good balance of strength and formability.
• Material selection by application: Deep drawing requires readily formable grades such as DC04, while bends benefit particularly from aluminium or stainless steels that are not too brittle. Laser cutting is suitable for almost all standard sheets, whereas waterjet cutting offers advantages with heat-sensitive or multi-layer materials.

Tolerances & accuracies

Modern sheet metal working enables extraordinarily precise results, which vary depending on the process, material and component geometry. With laser cutting, tolerances in the range of about ±0.1 mm are usual; the cut edges remain clean and the heat-affected zone is small, whereby only minimal distortion arises. Waterjet cutting works completely without thermal effect and thereby achieves particularly high dimensional accuracy, even with heat-sensitive materials or large material thicknesses. The precision here can often be below ±0.1 mm, depending on pump pressure, nozzle and material condition.

With bending, factors such as springback, bending radius, tool quality and material batch determine the end result. Modern press brakes compensate for these fluctuations through sensor-based real-time measurement and thus achieve high repeatability. Deep drawing processes require particularly careful coordination of tool geometry and material properties, since wall thickness distribution and drawing behaviour influence the final dimensions. Overall, the combination of a suitable process, exact material selection and modern measuring technology is decisive for precise and reproducible results in industrial sheet metal manufacturing.

Quality assurance in industrial sheet metal manufacturing

Quality assurance plays a central role in industrial sheet metal manufacturing, since precise dimensions, reproducible results and reliable documentation are indispensable for mechanical engineering, plant construction and automation. Even before the actual start of production, material batches are inspected, certificates checked and often initial sample parts produced in order to validate the interaction of material and process. During production, modern measuring techniques such as optical scanners, 3D coordinate measuring systems or digital angle measurements during bending ensure continuous monitoring of dimensional accuracy.

Depending on the application, surface qualities, edge formations or dimensional accuracy are additionally checked. In series production, standardised inspection protocols and documented process parameters are used in order to ensure consistently high quality and to guarantee the traceability of every component. Through this combination of modern measuring technology, clearly defined inspection procedures and documented standards, a reliable manufacturing process is created that meets industrial requirements in the long term.

Typical applications in industry in industry

Sheet metal parts occur in almost every sector. Typical examples are:

• Machine housings and control cabinets
• Mounting brackets, holders and mounting plates
• Covers, protective sheets and cladding
• Prototypes for development departments
• Series components in automation

Through the combination of modern cutting, forming technology and CNC finishing, high-quality components are created for daily industrial use.

Summary and outlook

Modern sheet metal working is a central building block of industrial manufacturing and combines precision, flexibility and economy. Through the interaction of various processes – from fast laser cutting through high-precision waterjet cutting to complex forming processes such as bending or deep drawing – components are created that meet the highest technical requirements. The right material selection, precise manufacturing technologies and consistent quality assurance form the basis for reproducible results and long-lasting products.

Companies benefit from short manufacturing times, reliable tolerances and the possibility of manufacturing components efficiently and with a precise fit both for prototypes and for series. Modern measuring technology, digital interfaces and online processes such as Laser online additionally expand the possibilities and ensure smooth, fast and transparent order processing.

FAQ on industrial sheet metal working

What is meant by sheet metal working? The production of components from metal sheets by means of cutting, forming, bending or combination processes.

When does laser cutting make sense? When high speed, fine contours and economical manufacturing are the priority.

When is waterjet cutting the better choice? With heat-sensitive materials, large thicknesses or when absolutely burr-free edges are desired.

Which sheets are suitable for deep drawing or bending? Softer, readily formable materials such as DC04 or AlMg3.

How are tolerances ensured? Through modern measuring technology, process monitoring and standardised inspection processes.