Metal Rolling Process
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This document summarizes the metal rolling process. It describes how rolling is used to plastically deform metal by passing it between rolls, providing close control of the final product dimensions. It defines various semi-finished products produced from rolling like billets, blooms, slabs, plates, sheets, and strips based on their cross-sectional area and thickness. It also describes hot rolling and cold rolling processes, their applications and equipment used.
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Metal Rolling Process
- 1. Manufacturing Processes -2 Topic : Metal Rolling Process Prepared By:- 130120119126- Pandya Kartik Guided By:- Prof. Hitesh Patel
- 3. • Rolling is the most widely used forming process, which provides high production and close control of final product. • The metal is subjected to high compressive stresses as a result of the friction between the rolls and the metal surface The process of plastically deforming metal by passing it between rolls.
- 4. Billet is the product obtained from a further reduction by hot rolling (cross sectional area > 40x40 mm2). Bloom is the product of first breakdown of ingot (cross sectional area > 230 cm2). Slab is the hot rolled ingot (cross sectional area > 100 cm2 and with a width ≥ 2 x thickness). SEMI FINISHED PRODUCTS
- 5. FURTHUR ROLLING PROCESSES MILL PRODUCTS Plate is the product with a thickness > 6 mm. Sheet is the product with a thickness < 6 mm and width > 600 mm. Strip is the product with a thickness < 6 mm and width < 600 mm.
- 7. Hot rolling is a metalworking process that occurs above the recrystallization temperature of the material. Hot rolled metals generally have little directionality in their mechanical properties and deformation induced residual stresses. However, in certain instances non- metallic inclusions will impart some directionality
- 8. Non-uniformed cooling will induce a lot of residual stresses, which usually occurs in shapes that have a non- uniform cross-section, such as I-beams and H-beams. Hot rolling is used mainly to produce sheet metal or simple cross sections, such as rail tracks. APPLICATION
- 9. It also improves the surface finish and holds tighter tolerances. Cold rolling occurs with the metal below its recrystallization temperature (usually at room temperature). Commonly cold-rolled products include sheets, strips and rods; products being smaller than the same products that are hot rolled. Due to smaller size of the workpieces and their greater strength than hot rolled stock, four-high or cluster mills are used.
- 10. ARRANGEMENTS OF ROLLERS USED IN ROLLING MILLS TWO HIGH MILL THREE HIGH MILL The stock is returned to the entrance for further reduction. Consist of upper and lower driven rolls and a middle roll, which rotates by friction.
- 11. CLUSTER OR SENDZIMIR FOUR HIGH MILL Small-diameter rolls (less strength & rigidity) are supported by larger-diameter backup rolls Each of the work rolls is supported by two backing rolls.
- 12. Rolling mill is a machine or a factory for shaping metal by passing it through rollers A rolling mill basically consists of • rolls • bearings • a housing for containing these parts • a drive (motor) for applying power to the rolls and controlling the speed
- 13. CONTINOUS TRANSVERSE SECTION OR SHAPE RING CONTINOUS CASTING AND HOT ROLLING THREAD
- 14. The objective is to decrease the thickness of the metal with an increase in length and with little increase in width.
- 15. • Using circular wedge rolls. • Heated bar is cropped to length and fed in transversely between rolls. • Rolls are revolved in one direction.
- 16. Flat slap is progressively bent into complex shapes Suitable for producing moulded sections such as irregular shaped channels and trim.
- 17. A specialized type of hot rolling that increases the diameter of a ring The resulting grain structure is circumferential, which gives better mechanical properties
- 18. Metal is melted, cast and hot rolled continuously through a series of rolling mills within the same process.
- 19. Rolled threads are produced in a single pass at speeds far in excess of those used to cut threads. • Dies are pressed against the surface of cylindrical blank. As the blank rolls against the in-feeding die faces, the material is displaced to form the roots of the thread, and the displaced material flows radially outward to form the thread's crest.