Sheet & Profile Rolling Services

What Rolling Is and When to Use It (vs. Roll Forming)

Sheet metal rolling (also called roll bending) uses rotating rollers to bend sheet or plate into curved shapes such as cylinders, cones and rings. In three‑roll or four‑roll machines, the sheet is pinched and then driven between rolls until it conforms to the desired radius. Because curvature depends on material thickness and the relative position of the rolls, operators often adjust roll spacing and perform test bends to compensate for springback. Rolling is ideal for producing individual cylindrical shells, tanks and other curved components.

Roll forming, on the other hand, is a continuous process. A coil or strip of metal passes through a line of sequential roller dies; each station incrementally bends the material until the final cross‑section is achieved. This method excels at producing long U‑profiles, C‑profiles and other complex sections with consistent geometry. Roll forming lines can include punching, notching or embossing operations. Because the process runs continuously, it is economical for high volumes and long lengths, whereas roll bending is more flexible for bespoke or short‑run parts.

When comparing rolling versus roll forming, volume and complexity are the main drivers. Forming and pressing techniques accommodate small to medium volumes and intricate designs, while rolling (including roll forming) is efficient for repetitive shapes and higher production volumes. Our engineers at BACH INDUSTRY AG can help you decide whether a sheet metal rolling machine or a profile roll forming machine makes economic sense for your application.

Machine Types (CNC, Hydraulic, Electric, Automatic, Manual) and Typical Materials (Steel, Aluminium)

Machine categories. Plate‑rolling machines are classified by the number and arrangement of their rolls. Power slip rollers are compact powered machines (typically 700–1000 lb with 2 hp–3 hp motors) used for small cylindrical work. Manual ring rollers use hand cranks to form rings as small as 25 mm in diameter. Slip‑roll machines (often called plate rollers) handle longer sheets (1.2 m–3 m) and can be manual or motorised. Industrial plate rolls come in 2‑, 3‑ and 4‑cylinder designs; 3‑cylinder machines provide significant bending power for mid‑thickness plates, while 4‑cylinder machines have a double‑pinch design that holds the plate securely during pre‑bend and rolling, allowing tighter diameters and reducing flat ends. Advanced CNC and hydraulic controls automate roll positioning and feed rate for consistent results.

Manual vs. motorised. Manual slip rolls are cost‑effective for simple prototypes, but motorised electric or hydraulic models increase productivity and accuracy. Powered systems can include touch‑screen CNC control for programmable radii and automatic material feeding. BACH INDUSTRY AG supplies manual, electric and hydraulic sheet metal rolling machines, and we offer automatic profile rolling machines for repetitive tasks such as ring rolling and cone forming. Customers in Switzerland, Germany, Austria, Liechtenstein, Belgium and Africa can choose between new equipment and used sheet metal rolling machines depending on budget and lead time.

Typical materials. Roll forming and bending equipment accommodates a wide range of alloys. Commercial roll forming products commonly use carbon and alloyed steel, stainless steel, aluminium and copper/brass/bronze. Material thicknesses from 0.3 mm to 5 mm (0.012"–0.200") are typical. Low‑yield metals such as aluminium and brass are easy to form, while stainless and high‑strength steels require greater tonnage and may limit achievable shapes. The material choice influences both capacity and cost; high‑carbon steels provide strength but need higher over‑bending angles.

Geometries We Produce (Cylinders, Cones, Rings, U/C Profiles)

Plate rolls can produce a variety of geometries beyond simple cylinders. Cylinders and cones are formed by adjusting the relative positions of the rolls and performing pre‑bends on each end; four‑roll machines can prebend both ends without removing the plate, eliminating slippage and delivering near‑perfect cylinders in a single pass. With special tooling, the same machines can roll oval, elliptical or conical shells. Ring rolling machines form small‑diameter rings by progressively bending a bar or strip; manual ring rollers can achieve diameters down to about 25 mm.

BACH INDUSTRY AG also offers profile rolling machines for structural sections. Our equipment can bend U‑profiles, C‑profiles, angles, tubes and flat bars into curves or complete rings. By combining roll bending with roll forming, we can produce continuous U/C channels for shutters or drywall panels and then cut them to length. Special geometry rolling solutions, such as sheet metal cone rolling machines and profile ring rolling processes, are available on request.

Tolerances, Quality, and Common Defects — How We Control Them

Achievable tolerances. Designers often ask how precise a rolled part can be. General guidelines for sheet metal fabrication suggest that forming or bending tolerances are around ±0.508 mm (0.020 in), a bend‑to‑hole distance tolerance of ±0.254 mm (0.010 in) and hole or edge tolerances of ±0.127 mm (0.005 in). Angularity tolerances of ±1° are typical. These numbers vary by material, thickness and equipment. Material selection, process complexity, equipment precision and the fabricator’s capabilities all influence actual tolerances, so consultation with your rolling partner is essential.

Quality control. Matching machine capacity to material yield strength is critical. Mild steels may have mill‑certified yields of 36,000–38,000 psi, but actual yields can be 48,000–58,000 psi, so operators must verify certificates before rolling. Prebending the ends of a plate requires more power than rolling the body, and a minimum unbent flat (1.5–3.5 × material thickness) will remain at each end. Four‑roll double‑pinch machines minimise these flats by clamping the plate through the entire process. BACH INDUSTRY AG calibrates its machines regularly and uses CNC controls to ensure consistent radii and repeatability.

Common defects and mitigation. Rolling defects include impurities and scratches (caused by dust, rust or mill shearing), edge cracks (from uneven heating or excessive tensile stress), alligator cracks (splitting due to high pressure or poor material uniformity), wavy edges (from roll deflection), zipper cracks (cracking in the middle due to high pressure) and center buckling (unequal pressure causing humps). Mitigation measures include cleaning materials, controlling temperature, using crowned or cambered rollers to prevent wavy edges, and adjusting roll pressure uniformly. Our quality management system at BACH INDUSTRY AG monitors these factors and maintains ISO‑compliant records.

Workflow & CAD Handoff (e.g., SolidWorks Tips)

Digital tools streamline communication between designers and fabricators. In SolidWorks, one efficient method for modelling a rolled component is to sketch profiles on parallel planes and use the Sheet Metal Lofted‑Bend tool to create the lofted shape. The resulting rolled part can be unfolded to a flat pattern using the Unfold tool. Punch holes or slots on the flat pattern, then refold the model to verify fit. Always assign a K‑factor appropriate to your material and note the rolling direction in your drawings.

For a successful handoff, include your 3D model (STEP or native CAD), a 2D DXF of the flat pattern, material specification and grain direction, thickness and tolerances, required bend radii, volume quantities and any post‑processing such as welding or coating. Our team reviews these inputs and offers design suggestions to ensure manufacturability.

Choosing Equipment vs. Outsourcing — Total Cost & Lead Time

Purchasing a sheet metal rolling machine or profile roll forming machine is a significant investment. Multi‑step lines require capital, skilled operators and floor space; outsourcing may be more economical when volumes are modest. A Dahlstrom study notes that up‑front equipment cost, along with hiring specialized workers, often outweighs the cost of outsourcing. Outsourcing also frees internal resources for unique fabrication work and can accelerate deliveries because suppliers have dedicated capacity.

However, owning your equipment can reduce long‑term per‑part costs when production volumes are high. Manual and semi‑automatic machines have lower purchase prices, while hydraulic and CNC machines demand higher CAPEX but lower OPEX due to automation and speed. At BACH INDUSTRY AG we offer new and used sheet metal rolling machines and profile rolling machines, plus leasing options. We also provide contract rolling services in Switzerland, Germany, Austria, Liechtenstein, Belgium and Africa. Our consultants can help calculate total cost of ownership and advise on lead times.

Pricing & RFQ Checklist (drawings, alloys, thickness, bend radius, volumes)

Pricing for a sheet metal rolling machine depends on roll size, maximum thickness, length capacity and automation level. A machine that rolls 2 mm stainless steel will command a different price than one designed for 8 mm carbon steel. Materials affect capacity: rolling aluminium increases capacity, while stainless steel reduces it by about one‑third. Four‑roll CNC machines cost more than manual slip rolls but offer faster setups and better accuracy. BACH INDUSTRY AG supplies machines and services across Switzerland, Germany, Austria, Liechtenstein, Belgium and Africa, and we tailor pricing to each market.

For contract rolling, prepare an RFQ that includes:

• Drawings and models: Provide a STEP or DXF of the profile and specify whether it is a U‑profile, C‑profile, ring or cone. Include cross‑sectional dimensions, bend radii and any features such as beads or edge rolling.

• Material details: Specify alloy and grade (e.g., S235JR mild steel, 304 stainless, 5083 aluminium), sheet thickness and any coatings or surface treatments.

• Bend radius or diameter: Indicate the inside radius or target diameter. For cones, give both large and small diameters and height.

• Volumes and delivery location: Quantities influence unit price; note if parts will ship to Switzerland, Germany, Austria, Liechtenstein, Belgium or Africa so we can calculate freight.

• Tolerances and quality requirements: List allowable dimensional and angular deviations, surface finish needs and inspection standards.

• Lead time and packaging: State required delivery dates and any special packaging (e.g., export crates).

Including these details helps us provide an accurate price and reduces back‑and‑forth, keeping your projects on schedule.

Conclusion

Sheet and profile rolling are essential capabilities for manufacturers of pressure vessels, structural components, architectural panels and custom profiles. Understanding the differences between roll bending and roll forming, choosing the right machine type and material, and accounting for tolerances, springback and rolling direction are critical to success. Whether you plan to buy a sheet metal rolling machine price or outsource production, BACH INDUSTRY AG’s engineers are ready to assist. We supply manual, electric, hydraulic and CNC sheet metal rolling machines, along with profile rolling machines and sheet metal roll forming machines, to clients in Switzerland, Germany, Austria, Liechtenstein, Belgium and Africa. Contact us to request a quote, send your drawings, or book an engineering consultation and turn your designs into reality.