There are two main types of rolling process.
Steel sheet rolling process.
The metal sheet has a smoother surface and the strength of the steel is also increased.
If the temperature of metal is above its re crystallization temperature then the process is known as hot rolling process.
Cold rolling is a process by which the sheet metal or strip stock is introduced between rollers and then compressed and squeezed.
The metals suited for this were lead copper zinc iron and later steel.
Profile rolling the finished product is a bar or rod.
Tin was often used to coat iron and steel sheets to prevent it from rusting.
Rolling is an important function of the steel industry.
Another interesting defect that can occur in flat rolling is alligatoring where the work being rolled actually splits in two during the process.
In short cold rolling results in a final metal sheet that is more accurate in terms of dimensions and properties than the one that is obtained from hot rolling process.
In cold rolling steel sheet is cooled at room temperature after hot rolling and is then annealed and or tempers rolled.
When steel is above the recrystallization temperature it can be shaped and formed easily and the steel can be made in much larger sizes.
Water powered rolling mills replaced the manual process in the late 17th century.
The amount of strain introd.
Rolling process is defined as a process used to reduced the thickness and to make the thickness uniform.
Rolling process has three steps to complete the product as shown in fig.
Flat rolling the finished product is a sheet.
The materials commonly rolled are steel copper magnesium aluminum and their alloys.
If the temperature of metal is below re crystallization temperature then it is known as a cold read more.
Hot rolling is a mill process which involves rolling the steel at a high temperature typically at a temperature over 1700 f which is above the steel s recrystallization temperature.
It s a steel fabrication process involving passing the metal through a pair of rollers.
After the grains deform during processing they recrystallize which maintains an equiaxed microstructure and prevents the metal from work hardening.
The process of flattening metal sheets required large rotating iron cylinders which pressed metal pieces into sheets.
The starting material is usually large pieces of metal like semi finished casting products such as slabs blooms and billets.
It is one of the most widely used among all the metal working processes because of its higher productivity and lower cost.
