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Forging
1. Hotforging
The hot forging manufacturing processis performedat extreme high
temperature (up to 1150 °C for steel,360 to 520 °C for al-alloys,700 to 800
°C for cu-alloys). During hot forging, the temperature reachesabove the
recrystallization point of the metal. Thiskind of extreme heat isnecessary
in avoiding strainhardening of the metalduring deformation.
ADVANTAGES
1. Productionofdiscrete parts
2. Low to medium accuracy
3. Scale Formation
4. Low stressesor low work hardening
5. Homogenized grainstructure
6. Increased ductility
7. Eliminationof chemicalincongruities
DISADVANTAGES
Less precise tolerances
Possible warping of the materialduring the cooling process
Varying metalgrainstructure
Cold Forging
Cold forging deforms metalwhile it is below its recrystallizationpoint.
Cold forging is generally preferred whenthe metalis already a soft metal,
like aluminum. Thisprocessis usually less expensive thanhot forging and
the end product requireslittle, if any, finishing work. The cold forging
manufacturing processis performedat room temperature.
ADVANTAGES
Easier to impart directionalproperties
Improved interchangeability
Improved reproducibility
2. Increased dimensionalcontrol
Handles high stress and high die loads
Producesnet shape or near-net shape parts
DISADVANTAGES
Easier to impart directionalproperties
Improved interchangeability
Improved reproducibility
Increased dimensionalcontrol
Handles high stress and high die loads
Producesnet shape or near-net shape parts
The metal surfacesmust be cleanand free of scale before forging
occurs
The metal is less ductile
Residual stressmay occur
Heavier and more powerfulequipment isneeded
Stronger tooling is required