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Ring rolling is a special type of hot rolling that increases the diameter of the ring.The starting material is a thick-walled ring.This workpiece is placed between two rollers, an inner idler and a driven roller, pressing the ring from the outside.As rolling occurs, the wall thickness decreases with increasing diameter.The rolls can be shaped to form various cross-sectional shapes.The resulting grain structure is circumferential and provides better mechanical properties.Available in diameters as large as 8 m (26 ft) and working face heights up to 2 m (79 in).Common applications include railroad tires, bearings, gears, rockets, turbines, aircraft, pipelines and pressure vessels.
Controlled rolling is a thermomechanical processing that integrates controlled deformation and heat treatment.The heat that brings the workpiece above the recrystallization temperature is also used to perform the heat treatment, so any subsequent heat treatment is not required.Types of heat treatment include producing a fine grain structure; controlling the nature, size and distribution of various transformation products such as ferrite, austenite, pearlite, bainite and martensite in steel; inducing precipitation hardening; And, control toughness.In order to achieve this, the entire process must be closely monitored and controlled. Common variables in controlled rolling include raw material composition and structure, deformation levels, temperature and cooling conditions at various stages.Benefits of controlled rolling include better mechanical properties and energy savings.
Forging is a longitudinal rolling process that reduces the cross-sectional area of heated bars or billets by guiding them between two counter-rotating roll sections.This process is mainly used to provide an optimized material distribution for the subsequent die forging process.Thanks to this,better material utilization, lower processing forces and better surface quality of the parts can be achieved in the die forging process.
Basically any wrought metal can be forged.Forging is mainly used for preforming long-dimension blanks through targeted mass distribution of components such as crankshafts, connecting rods, steering knuckles and axles.The tightest manufacturing tolerances can only be achieved partly by forging.This is the main reason why forging is rarely used for finishing, but mainly for preforming.
Features of forging:
High productivity and high material utilization.
Good surface quality of forged workpieces.
Extended tool life.
Small tool and low tool cost.
Improved mechanical properties due to optimized grain flow compared to fully swaged workpieces.
A rolling mill,also called a mill or mill, has a general structure independent of the specific type of rolling performed:
Backup Rolls designed to provide the rigid support required by the work rolls to prevent buckling under rolling loads.
Roll Balance System ensures that the upper and backup rolls remain in the correct position relative to the lower work roll.
Roll Changing Units Using overhead cranes and devices designed to attach to roll necks for removal or insertion of rolls from the mill.
Mill Guards ensures that the forces applied to the back-up roll chocks are not so high as to break the roll neck or damage the mill shell.
Roll cooling and lubrication system.
Pinion the gear that distributes power between the two main shafts, turning them at the same speed but in different directions.
Gearing to establish the desired rolling speed.
Drive motors thousands of horsepower for rolling narrow foil products.
Electrical control constant and variable voltage applied to the motor.
Coilers and Uncoilers unwinding and coiling metal coils.
Slabs are the feed for hot strip mills or slab mills, and blooms are rolled into billets in billet mills or large sections in structural mills.The output of the strip mill is coiled and subsequently used as feed to a cold rolling mill or directly by the manufacturer. Billets for re-rolling are then rolled in commercial rolling mills, bar mills or bar mills.Commercial or bar mills produce various shaped products such as angles, channels, beams, rounds (long or coil) and hexagons.