Definition
When the working temperature is below the recrystallization temperature is called "Cold working Process"
The grain refinement is not possible in this process.It performs in general room temperature. This metals changes the structure of grain. The High pressure used in cold working process. Residual and severe stresses are forming in this process. Mechanical properties effectively controlled in this process. To improve tensile strength and increase hardness of steel in this process. Cold working temperature reduces ductility property.
Properties of the Cold working Process
1. Better Surface finish
2. Cracks formation is great
3. It requires Intermediate annealing
4. Contamination problems is reduced
5. Impurities are squeezed into fibres is no problem
6. There is no scaling problem
7. Development of residual stresses
The Cold working Process as follows,
1. Rolling
2. Bending
3 .Spinning
Advantages of Cold Working Process
1. Good surface finish
2. It produces thin gauge sheets
3. Surface defects are easily removed
4. High accuracy obtained
5. It suitable for mass production and automation due to low working temperature
Disadvantages of Cold Working Process
1. It is suitable only for ductile materials
2. Deformation of metals are expensive
3. High internal stresses are produced
4. Cost is high for production of large deformation
When the working temperature is below the recrystallization temperature is called "Cold working Process"
The grain refinement is not possible in this process.It performs in general room temperature. This metals changes the structure of grain. The High pressure used in cold working process. Residual and severe stresses are forming in this process. Mechanical properties effectively controlled in this process. To improve tensile strength and increase hardness of steel in this process. Cold working temperature reduces ductility property.
Properties of the Cold working Process
1. Better Surface finish
2. Cracks formation is great
3. It requires Intermediate annealing
4. Contamination problems is reduced
5. Impurities are squeezed into fibres is no problem
6. There is no scaling problem
7. Development of residual stresses
The Cold working Process as follows,
1. Rolling
2. Bending
3 .Spinning
Advantages of Cold Working Process
1. Good surface finish
2. It produces thin gauge sheets
3. Surface defects are easily removed
4. High accuracy obtained
5. It suitable for mass production and automation due to low working temperature
Disadvantages of Cold Working Process
1. It is suitable only for ductile materials
2. Deformation of metals are expensive
3. High internal stresses are produced
4. Cost is high for production of large deformation