Category: Mechanical Working Of Metals, Sheet Metal Work, And Powder Metallurgy

Forging is a process of plastic deformation for shaping. The force applied in this case is intermittently compressive force while in a rolling process force applied is continuous compressive force.

There are two types of rolling defects—surface defects and internal defects as shown in Figures 21.3 and 21.4, respectively. Figure 21.3 Surface Rolling Defects Figure 21.4 Internal Rolling Defects

The different types of rolling mills are shown in Figure 21.2. In two high rolls mill (pullover), the stock is returned to the entrance for further reduction. In two-high mill (reversing), the work can be passed back and forth through the rolls by reversing their direction of rotation. In three high rolls mill, upper and lower…

Recrystallization Temperature According to ASME (American Society of Mechanical Engineers), the recrystallization temperature is defined as ‘the approximate minimum temperature at which the complete recrystallization of cold worked metal occurs within a specified period of time.’ Recrystallization reduces the strength and increases the ductility of the metal. Factors which Affect the Recrystallization Temperature

Mechanical working is a process of shaping of metals by plastic deformation. When a metal is subjected to external force beyond yield strength but less than fracture strength of the metal, metal is deformed by slip or twin formation. There are two types of mechanical working process: cold working and hot working. When metal is…