Ring Rolling Process

The correct answer is option 'C', which is ring rolling. In the ring rolling process, a small-diameter thick ring is expanded into a large diameter thinner ring by placing the ring between two rolls. Let's understand the process in more detail.

Introduction to Ring Rolling

Ring rolling is a specialized process used in the manufacturing of seamless rings with varied cross-sections. It involves reducing the thickness of a ring while simultaneously increasing its diameter. The process is typically carried out using a radial-axial ring rolling mill.

The Ring Rolling Process

The ring rolling process involves the following steps:

1. Preparation: The starting material, usually a thick-walled ring or a preform, is prepared. The preform is typically produced by either forging or casting.

2. Heating: The preform is heated to a suitable temperature to improve its plasticity and reduce the force required for deformation. The heating is usually done in a furnace.

3. Placement: The heated preform is placed between two rolls, one on the top and the other at the bottom. The rolls have corresponding profiles that match the desired shape of the final ring.

4. Rolling: The rolls rotate in opposite directions and apply radial and axial forces to the preform. The radial force causes the ring to expand in diameter, while the axial force reduces its thickness. The ring is squeezed between the rolls, causing the material to flow and redistribute.

5. Progressive Rolling: The rolling process is typically carried out in multiple passes to achieve the desired shape and dimensions. After each pass, the rolls are adjusted to gradually reduce the ring's thickness and increase its diameter.

6. Final Shape: The ring undergoes plastic deformation as it passes through the rolls. The material flows and redistributes to conform to the shape of the rolls, resulting in a larger diameter and thinner cross-section.

7. Finishing: After the desired dimensions are achieved, the ring may undergo additional processes such as heat treatment, machining, or surface finishing to meet the required specifications.

Advantages of Ring Rolling

- The ring rolling process allows for the production of seamless rings with complex shapes and varied cross-sections.
- It offers superior material properties and structural integrity compared to rings produced by other methods.
- The process is highly efficient and can be used for both small-scale and large-scale production.
- Ring rolling can be used to produce rings with precise dimensions and tolerances.

Conclusion

In summary, the ring rolling process involves expanding a small-diameter thick ring into a large diameter thinner ring by placing the ring between two rolls. This process is used in the manufacturing of seamless rings with varied cross-sections and offers several advantages in terms of material properties, structural integrity, and dimensional accuracy.