Hot Drape Forming Process & Equipment

Hot drape forming involves heating a metal plate or blank to a temperature at which it becomes sufficiently plastic, then positioning it over or onto a shaped die and applying press force to conform the material to the die's contour. The elevated temperature reduces forming force, minimizes springback, and allows tight-radius bends and compound curves that would crack the material if attempted cold. After forming, controlled cooling or heat treatment restores mechanical properties.

MTS Forge hot drape forms a broad range of alloys including carbon steels, alloy steels, austenitic and duplex stainless steels, and high-performance nickel-based alloys such as Monel K-500. Material selection determines the required forming temperature, die material, and post-form heat treatment. Our metallurgical expertise ensures correct parameter setting for each alloy to achieve the required mechanical properties in the finished component.

Cold forming is performed at or near room temperature and relies on the material's ambient ductility; it works well for moderate bends in softer alloys but risks cracking in hard or thick sections. Hot drape forming heats the blank above its recrystallization or upper critical temperature, dramatically increasing plasticity. This allows tighter radii, thicker cross-sections, and more complex contours with lower press tonnage and significantly reduced springback compared to cold forming.

Hot drape formed components are widely used in aerospace structures, defense platforms, commercial nuclear vessels, power generation equipment, chemical processing systems, and heavy industrial machinery. These sectors require complex contoured shapes in high-performance alloys with tight dimensional tolerances and verified mechanical properties — all of which hot drape forming delivers cost-effectively compared to machining solid billets or bar stock to the same geometry.

MTS Forge operates under a comprehensive Quality Assurance Program that includes Mil I 45208 (inspection system requirements), Mil Q9858 (quality program requirements), and NCA 3800 (nuclear quality assurance). These certifications provide complete material traceability, documented process controls, and auditable records from raw material receipt through final inspection — meeting the procurement requirements of aerospace, defense, and commercial nuclear customers.

Yes. MTS Forge maintains in-house capability to design and develop forming dies and tooling. This allows rapid iteration on tooling geometry, competitive tooling costs compared to outsourced die suppliers, and the ability to produce a diverse range of contoured shapes without extended lead times. Our large existing tooling inventory further reduces first-article lead times for shapes that match standard or near-standard profiles already in our library.

In-house normalizing heat treatment is available immediately following the forming operation at MTS Forge's Coatesville, PA facility. Normalizing heats the formed component above its upper critical temperature and allows controlled air cooling, which refines grain structure, relieves residual stresses introduced during forming, and produces uniform tensile strength and toughness throughout the part — a standard requirement for aerospace, defense, and nuclear-rated forgings and formed plates.

Yes. In-house rough machining is performed directly after forming and heat treatment, removing flash, surface irregularities, and dimensional excess to bring components to near-net shape. This eliminates the need to source a separate machining vendor, reduces handling risk and shipping steps, shortens overall lead time, and lowers total production cost — particularly valuable for customers with tight delivery schedules in aerospace, defense, or power generation procurement programs.