Metal forming as a key industrial technology

Precision instead of waste: How metal forming and 3D printing are radically changing production

The modern industrial landscape is currently undergoing a profound transformation, often taking place away from the public eye. At its heart are two technological giants that could not be more different: the time-honored field of metal forming and the revolutionary field of metal additive manufacturing. While the German forging industry, with a production value of almost 8 billion euros and over 2.2 million tons of steel, forms the backbone of mechanical engineering and the automotive sector, metal 3D printing is rapidly advancing with projected market volumes of 60 billion US dollars.

But this isn't simply a matter of displacement. While bulk metal forming boasts unparalleled material efficiency of over 95 percent and a superior microstructure that gives components extreme dynamic load-bearing capacity, additive manufacturing scores points with a geometric freedom that shatters previous design limitations. Above all, the transformation to electromobility and the industry's stringent sustainability goals are forcing both processes into a new strategic alliance. From highly stressed landing gear components in the Airbus A380 to customized implants in medical technology and enormous components for wind power – choosing the right manufacturing process has long since become a complex balancing act between unit costs, functional integration, and carbon footprint.

The unrecognized power of massive forming

Bulk metal forming represents a manufacturing technology whose economic relevance is systematically underestimated in the public perception. In Germany, the forging industry generated a production value of €7.9 billion in 2022, with a tonnage of over 2.2 million tons. Approximately 250 mostly medium-sized companies with around 31,000 employees form the foundation of this sector, which is considered a global technology leader.

The economic significance of this technology only becomes clear when considering the customer base. Almost 50 percent of the forged components go to the automotive industry, another 30 percent supply system manufacturers for transmissions and drive systems, while mechanical engineering, with 12 percent, constitutes the third largest market. This concentration on the automotive sector explains both the historical strength and the current vulnerability of forged components.

The landscape of bulk metal forming processes is primarily differentiated by the temperature control during forming. Cold forming takes place at room temperature without additional heating, resulting in high dimensional accuracy and significant work hardening. Semi-hot forming operates on steel between 750 and 950 degrees Celsius, combining the advantages of both extremes, while hot forming, at temperatures up to 1200 degrees Celsius, is particularly suitable for processing high-strength materials with low forming forces. This temperature control fundamentally determines component properties, energy consumption, and cost-effectiveness.

The dominance of specific procedures

Within the German metal forming industry, die forging (pressure forming) dominates with 51 percent of the production volume, followed by cold extrusion with 25 percent and open-die forging with 17 percent. Die forging creates the characteristic fiber structure in the material that gives solid-formed components their superior dynamic load-bearing capacity. This fiber orientation, which adapts to the component contour, can never be achieved through machining and accounts for the unsurpassed strength combined with reduced weight.

Material efficiency represents a decisive advantage. While up to 60 percent of the starting material is lost as chips during machining, bulk forming utilizes almost the entire volume of the semi-finished product. This resource efficiency is gaining considerable economic relevance in times of rising raw material prices and sustainability demands. An average bulk-formed component achieves a material utilization rate of over 95 percent.

The revolutionary promise of additive manufacturing

Metallic additive manufacturing promises a fundamental reorganization of industrial production logics. The global metal 3D printing market grew from US$2.85 billion in 2022 to US$4.7 billion in 2024 and is projected to expand to almost US$60 billion by 2034. This growth dynamic far surpasses that of traditional forming technologies.

The technological landscape of metallic additive manufacturing is differentiated into several main processes. Laser powder bed fusion dominates the market with its high precision, although newer technologies such as wire arc additive manufacturing and cold spraying are gaining increasing importance due to dramatically lower unit costs. A WAAM process achieves costs of around €180 per kilogram compared to €250 for powder bed fusion, albeit with reduced precision and higher post-processing costs.

The fundamental appeal of additive manufacturing lies in its geometric design freedom. Complex cooling channel structures, lightweight grids, and functionally integrated components, which would be impossible or uneconomical using conventional methods, suddenly become feasible. One additively manufactured engine component can replace seven previously separately manufactured and assembled components, while simultaneously reducing weight by 45 percent and shortening assembly time.

Industry-specific application logics

The automotive industry utilizes both technologies in complementary roles. Bulk forming dominates for highly stressed series components such as crankshafts, connecting rods, steering knuckles, and transmission gears. These components require dynamic strength and wear resistance while maintaining low unit costs in the millions. Additive manufacturing focuses on prototypes, tool components with conformal cooling channels, and highly complex components in small batches. An injection mold with additively manufactured cooling channels reduces cycle times by up to 40 percent.

The transition to electromobility presents the metal forming industry with existential challenges. An electric motor requires no crankshaft, no connecting rods, no valves, and significantly fewer transmission components. While an internal combustion engine contains over 200 metal-formed components, this number is reduced to approximately 50 to 70 parts in electric drives. However, new applications such as modular rotor shafts, manufactured using innovative cold forming processes with thickening and gearing functions, offer potential for compensation.

Aerospace as a technology driver

The aerospace industry represents the sector where additive manufacturing is already demonstrating its disruptive power. Airbus and Boeing are increasingly integrating 3D-printed metal components into production aircraft. The fuel nozzle of GE Aviation's LEAP engine, which is produced in a single additive manufacturing step and previously replaced 20 individual parts, marked a turning point. Over 45,000 of these nozzles are now in use on commercial aircraft.

Despite these successes, forging maintains its position for highly stressed components. Turbine blades, engine shafts, and landing gear parts continue to be primarily manufactured by die forging from nickel, titanium, and steel alloys. The combination of extremely high operating temperatures, cyclic loads, and safety requirements favors the proven microstructure quality of forged parts. A forged landing gear component of an Airbus A380 weighs up to three tons and withstands millions of load cycles.

Additive manufacturing is revolutionizing spare parts logistics. In 2022, Lufthansa Technik received the first EASA approval for a load-bearing, additively manufactured titanium spare part for the V2500 engine. This on-demand production eliminates costly warehousing and reduces delivery times from weeks to days, potentially saving hundreds of thousands of euros with each aircraft downtime.

Energy industry and wind power

The wind energy industry places extreme demands on forged components. Main rotor output shafts, generator and gearbox shafts, bearing rings, and all gears must withstand hurricane-force gusts and alternating loads for decades. Drop-forged gears with diameters up to 500 millimeters and modules of 9.5 are manufactured using innovative hot-rolling processes that achieve 20 percent higher strength than conventionally manufactured gears.

High-strength bolted connections with thread diameters up to 64 millimeters join the multi-ton tower segments. These bolts undergo several forming stages and complex heat treatments to achieve the required combination of strength and toughness. Bulk forming is unrivaled here, as no alternative manufacturing technology offers the necessary combination of size, strength, and cost-effectiveness.

Medical technology between precision and individualization

Medical technology demonstrates the complementary coexistence of both technologies. Bulk metal forming produces precise components for dental equipment, wheelchair axles, and surgical instruments in high volumes and with tight tolerances. Aluminum forgings, through controlled fiber orientation, achieve a strength and fatigue resistance that significantly surpasses that of castings.

Additive manufacturing dominates the production of customized implants. A patient-specific hip implant made of titanium or cobalt-chromium is created directly from CT data without tooling costs. This mass customization enables perfect anatomical adaptation and can improve osseointegration through integrated porous structures. The cost per implant ranges from €2,000 to €8,000, which is acceptable in this market.

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The oil, gas and chemical industries

In the oil and gas industry, forged valves, flanges, and high-pressure components are dominant. These components must withstand extreme pressures up to 700 bar, corrosive media, and temperature fluctuations. Drop-forged valve bodies made of high-alloy steels guarantee the required reliability for decades.

Additive manufacturing is opening up niche markets here. Complex flow paths in valves, which minimize pressure losses, can be optimized additively. A 5-in-1 manifold, which would conventionally consist of five welded parts, is produced as a single component with integrated flow optimization.

Mechanical engineering and toolmaking

Mechanical engineering accounts for twelve percent of German bulk metal forming production. Shafts, gears, levers, bearings, and fasteners form the mechanical skeleton of production plants. Cold forging achieves tolerances in the hundredths of a millimeter range while simultaneously working hardening, which significantly increases hardness and wear resistance.

Toolmaking is undergoing a quiet revolution thanks to additive manufacturing. Injection molds with conformal cooling channels reduce cycle times by 30 to 50 percent. Extrusion molds with optimized cooling double their service life. These hybrid tools often combine additively manufactured functional areas with conventionally produced base bodies.

Rail vehicles and transport

The rail industry demands forged components with exceptional reliability. Brake discs for high-speed trains, axles, wheels, pivots, and couplings must withstand millions of load cycles. Deutsche Bahn's HPQ approval sets rigorous quality standards that can only be met through controlled forging with complete documentation.

A wheel carrier for an ICE high-speed train undergoes several forming stages, heat treatments, and non-destructive testing. The resulting component guarantees safety under extreme loads and speeds exceeding 300 kilometers per hour. Additive manufacturing currently plays no significant role here, as certification requirements and production volumes favor conventional methods.

The economic comparison

The cost structures of the two technologies differ fundamentally. Bulk metal forming requires high tooling investments of between €50,000 and €500,000 per component type, but then achieves unit costs in the single-digit euro range for large production runs. Break-even quantities are typically between 10,000 and 100,000 units.

Additive manufacturing eliminates tooling costs but has significantly higher unit costs. A titanium component costs between 80 and 200 euros per kilogram, depending on the technology, complexity, and post-processing. Material accounts for 40 to 60 percent of the total costs, machine time 20 to 30 percent, and post-processing another 15 to 25 percent.

These cost structures define clear application domains. Production runs exceeding 50,000 units favor bulk forming, while quantities below 1,000 favor additive manufacturing. The range between 1,000 and 50,000 units represents a competitive area where complexity, development time, and inventory costs influence the decision.

Sustainability and climate neutrality

The steel forming industry faces the existential challenge of decarbonization. The electrical energy demand for heating processes in German steel forming is 1250 gigawatt hours annually, while the primary energy demand is three times that amount. With average CO2 emissions of 0.475 kilograms per kilogram of steel and the German electricity mix, this results in considerable environmental damage.

The NOCARBforging 2050 initiative of the German Association for Bulk Metal Forming (Industrieverband Massivumformung) is developing a climate pathway to CO2 neutrality by 2045. Raw material efficiency through near-net-shape forming offers savings potential of 20 to 40 percent. Switching from solid material to semi-finished tubes reduces the CO2 footprint of a typical motorcycle component by 37 percent. Cold forming processes completely eliminate heating energy and achieve CO2 savings of over 200,000 kilograms per year in the series production of rotor shafts.

Additive manufacturing presents itself as a more sustainable alternative due to minimal material waste. While conventional machining wastes up to 80 percent of the material, additive manufacturing utilizes only the design volume. Unused metal powder can be recycled at a rate of 95 percent. On-demand manufacturing eliminates warehousing and reduces transportation emissions.

This sustainability argument, however, ignores the high energy consumption of powder production and laser or electron beam processes. A powder bed system consumes 10 to 20 kilowatts continuously, which leads to high specific energy consumption at low build rates. Comprehensive life cycle assessments show that additive manufacturing is only more sustainable for highly complex, optimized components with a significant weight advantage over their life cycle.

Digitalization and Industry 4.0

The integration of digital technologies is progressing at different speeds in both areas. Bulk metal forming is increasingly implementing inline quality measurement after the forging process, minimizing scrap through immediate evaluation. Temperature monitoring, force measurement, and optical geometry acquisition reduce defective parts by up to 15 percent.

Additive manufacturing is inherently digital. Every component initially exists as a CAD model, undergoes process simulation, and features optimized support structure generation. Build monitoring using infrared cameras and machine learning detects process deviations in real time. This end-to-end digitalization enables decentralized manufacturing and digital warehousing.

Hybrid manufacturing strategies

The future may lie in combining both technologies. Hybrid additive manufacturing combines bulk forming or casting with subsequent additive material deposition. A chassis component is first forged, then highly stressed areas are additively reinforced. This process combination achieves material savings of 53 percent compared to pure machining, while simultaneously offering shorter process times than purely additive manufacturing.

Plastic-metal extrusion combines cold forming with the simultaneous melting of plastic granules using forming heat. These hybrid components combine metallic strength with plastic functionality, eliminating joining steps. Steel-aluminum hybrid forgings combine high-strength steel sections with lightweight aluminum zones, achieving weight savings of up to 50 percent.

The cost reality of small production runs

The economic justification of bulk metal forming for small production runs requires a holistic approach. Even when nominally cost-equivalent to machining, forming offers superior component properties. The optimized fiber orientation increases dynamic strength by up to 30 percent, enabling thinner cross-sections and weight reduction. Cold working enhances wear resistance without additional heat treatment.

Modern forming machines with lower productivity reduce investment and changeover costs. Cross wedge rolling machines with modular wedge plates achieve setup times of under 30 minutes. 3D-printed forging dies with integrated cooling channels extend tool life by 40 percent and pay for themselves even with production runs of less than 5,000 units.

The market dynamics of additive manufacturing

The European market for metallic additive manufacturing reached approximately €1.5 billion in 2024 and is growing at an annual rate of 15 percent. Germany dominates with a 28 percent market share, driven by manufacturers such as EOS, TRUMPF, and SLM Solutions. These companies are increasingly developing larger build volumes, higher build rates, and industrialized process chains.

The challenges remain significant. Certification efforts, material costs, limited process speed, and a shortage of skilled workers hinder wider adoption. An aerospace component undergoes qualification processes lasting several years. Metal powder costs three to five times as much as raw metal. Scaling up to mass production fails due to typical build rates of 50 to 200 cubic centimeters per hour.

The transformation of bulk metal forming

The German metal forming industry is undergoing a fundamental transformation. Electromobility is reducing product volume, energy prices are impacting competitiveness, and sustainability requirements necessitate investment. Approximately 537 companies, with an average of 60 employees, are facing the challenge of redefining their business models.

Successful strategies combine several elements. Developing new applications in wind power, hydrogen technology, and rail transport diversifies sales markets. Material substitution from steel to aluminum or hybrid solutions addresses lightweight construction requirements. Process innovations such as semi-hot forming or partial heating reduce energy consumption. International expansion compensates for shrinking domestic markets.

The integration of additive manufacturing as a complementary technology opens up new business opportunities. Tool optimization, prototype production, and small-batch production complement the portfolio. Forming companies with hybrid expertise are positioning themselves as system providers for complete solutions.

The strategic contrast

Bulk metal forming and metallic additive manufacturing represent fundamentally different production philosophies. Bulk metal forming optimizes high-volume production through perfected processes, minimized unit costs, and reproducible quality. Additive manufacturing maximizes flexibility, geometric freedom, and customization at the cost of accepting higher unit costs.

This divergence defines complementary, not competing, domains. A significant portion of global steel production, at 1.9 billion tons annually, goes into bulk metal forming. Additive metal manufacturing currently processes an estimated 15,000 tons of metal powder annually; a factor of over 100,000 separates these two volumes.

The coming decades will not bring the substitution of one technology for the other, but rather their intelligent combination. Bulk metal forming will remain indispensable for load-bearing series components in vehicles, machinery, and infrastructure. Additive manufacturing is conquering niche markets with complexity, individualization, and on-demand requirements. True innovation lies in hybrid process chains that connect both worlds and optimally leverage their respective strengths.

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