Roll Forming: The Ultimate Guide to Metal Shaping (Part 2)

Chapter Five: Metals Suitable for Roll Forming

Roll forming is compatible with a wide range of ferrous and non-ferrous metals and their alloys. The choice of metal influences the adjustments required at each bending stage of the roll forming process. Let's explore some of the commonly used metals in roll forming:

Ferrous Metals (Contains Iron)

1. Steel: Made primarily of iron, steel is malleable and does not require special heat treatment below its melting point. It is typically free from slag and contains small amounts of silicon and manganese, as well as trace quantities of sulfur and phosphorus.

2. Stainless Steel: Stainless steel contains a high percentage of chromium, making it highly resistant to strain and corrosion. It exhibits excellent resistance to weak mineral acids, oxidation, organic acids, and caustic materials.

3. Galvanised Steel: Galvanised steel is coated with a layer of zinc and heat-treated to form a bonded coating of zinc-iron alloy. This coating provides enhanced corrosion resistance and durability.

Non-Ferrous Metals (Does Not Contain Iron)

4. Aluminium: Aluminum is a lightweight, malleable metal that exhibits excellent corrosion resistance. It is often coated with a layer of aluminium oxide for added protection.

5. Brass: Brass is an alloy of copper and zinc, offering corrosion resistance and malleability. It is commonly used in various applications and is available in different forms, including bronze.

6. Copper: Copper is known for its excellent electrical conductivity and is a primary component in non-ferrous alloys. It is widely used in various industries, including electrical and construction.

7. Lead: Lead possesses high density, a low melting point, and resistance to corrosion. It is ductile and a poor electrical conductor. Lead is often utilized in specialized applications where these unique properties are required.

Chapter Six: Different Types of Roll Forming Processes

Roll forming encompasses various methods and processes used to shape metals into desired profiles. Let's explore some of the most common types of roll forming processes:

8. Roll Bending: Roll bending is suitable for thick, large metal plates. It involves the use of three rollers to bend the plate into the desired curve. The position and distance between the rollers determine the exact bend and angle.

9. Flat Rolling: Flat rolling is the most basic form of roll forming, resulting in a metal part with a rectangular cross-section. Two working rollers, rotating in opposite directions, gradually elongate the material by reducing its thickness. Multiple passes may be required to achieve the desired deformation.

10. Shape Rolling/Structural Shape Rolling/Profile Rolling: Shape rolling is used to create moulded sections, such as irregular-shaped channels and trim. It can produce various profiles, including I-beams, L-beams, U-channels, and rails for railroad tracks.

11. Ring Rolling: Ring rolling is employed to create large seamless rings. A small-diameter workpiece is rolled between two rollers, with one roller serving as the drive roller while the other remains idle. An edging roller ensures a constant width of the ring during the rolling process.

12. Plate Rolling: Plate rolling machines are used to roll metal sheets into tightly shaped cylinders. There are two types: four-roller and three-roller machines. Four-roller machines utilise top, pinch, and side rollers, while three-roller machines apply pressure from two top rollers and one bottom roller.

Each of these roll forming processes offers unique advantages and is chosen based on the specific requirements of the desired metal profile.

Chapter Seven: Roll Forming Machines

Roll forming machines come in various types, each designed for specific applications. Let's explore some common roll forming machine types:

13. Stud and Track Machines: Stud and track machines produce assembly frames for partitions, offering strength and lightweight characteristics. These machines can form studs or tracks of different sizes using steel of various gauges.

14. Angle Machines: Angle roll forming machines specialise in producing equilateral or unequal perpendicular angles. These angles find applications in framing, rails, posts, supports, and brackets.

15. Beam Machines: Beam roll forming machines are used to manufacture box beams for construction purposes. The resulting beams feature double-thickness flanges and single-thickness webbing, providing excellent strength and load-bearing capabilities.

16. Seamless Machines: Seamless roll forming machines are employed to produce tubing with various cross-sectional shapes, including square, round, oval, or rectangular. The seamless aspect is achieved through TIG welding or lasers, ensuring high-quality and durable tubing.

17. Wrap Machines: Wrap roll forming machines create wrapped L-shaped edges or flanges on sheet metal. These machines utilise a set of rollers running along a table, allowing for the production of complex or simple flanges at high speeds.

Each type of roll forming machine serves a specific purpose, enabling manufacturers to produce a diverse range of products efficiently.

Chapter Eight: Applications and Products of Roll Forming

Roll forming finds applications across multiple industries, enabling the manufacturing of a wide variety of metal products. Let's take a look at some of the common applications and products produced through roll forming:

18. Door and Window Hardware: Roll forming is widely used in the production of door and window hardware, including hinges, tracks, locks, and handles. The precise shaping and dimensional accuracy of roll forming ensure high-quality components for smooth operation.

19. Metal Fencing: Roll-formed metal components are extensively utilised in the production of metal fences. The flexibility of roll forming allows for the creation of various fence designs, offering strength, durability, and aesthetic appeal.

20. Computer Casings and Components: Roll forming plays a significant role in the production of computer casings and components, such as server chassis and frames. The ability to create complex profiles and precise dimensions makes roll forming ideal for these applications.

21. Metal Furniture Components: Roll-formed metal components find application in the production of metal furniture, including chair frames, table legs, and shelving systems. The versatility of roll forming allows for the creation of intricate and stylish designs.

22. Rain Gutters and House Siding: Roll-formed metal profiles are commonly used in the production of rain gutters and house siding. The ability to create continuous lengths of profiles ensures seamless installation and enhances the durability and functionality of these components.

These applications represent just a fraction of the numerous products that can be created through roll forming. Other examples include desk drawer slides, steel support framing, metal tubing, construction flashing, roofing materials, and exteriors of aircraft and automobiles.

Chapter Nine: Rolled Steel Channels

Rolled steel channels are a widely used profile shape in construction and other industries. They are categorised based on their shape, with "C" and "U" shapes being the most common. Steel channels have a wide web with two flanges to form the "C" or "U" shape. The dimensions of steel channels can be described using UPE and UPN methods, depending on the specific dimensions and characteristics.

Steel channels may be coated to protect against corrosion. Coating options include hot-dipped galvanisation, zinc coating, or primer, with the choice depending on the application and environmental requirements.

Conclusion

Roll forming is a versatile and efficient metal shaping process that offers numerous benefits and advantages. Its ability to produce custom-designed profiles with high precision, dimensional accuracy, and cost-effectiveness makes it an indispensable method in various industries. By understanding the roll forming process, technological advances, metal compatibility, and applications, manufacturers can harness the full potential of roll forming to create high-quality products that meet diverse needs.

Roll forming continues to evolve, driven by advancements in technology and engineering. As new materials and techniques emerge, the possibilities for roll-formed products will only expand, further solidifying roll forming's position as a leading method for metal shaping. Embrace the power of roll forming and unlock endless opportunities for innovation and excellence.