Classification of Metal Working Processes
Warm Working: It is defined as the mechanical working of metal at a temperature between that of Hot working and Cold Working. Ingot is the starting raw metal for all metal working process. Molten metal from the furnace is taken and poured into metallic moulds and allowed to cool or solidify. The cooled solid metal mass is then taken out of the,MECHANICAL ENGINEERING: COLD WORKING,13. Spring back is a common phenomenon present in cold-working processes. 14. For relatively ductile metals, cold working is often more economical than hot working. There is some increase and some decrease in properties of the cold worked part, which are given as under. Cold working process increases: • Ultimate tensile strength • Yield,Difference between Hot Working and Cold Working,,The term "cold rolling" can be misleading. The material may start out quite cold, even as low as 32 F (0 C), but when it comes out of the cold mill, it will be far too hot to touch. This is not because heat has been applied by flame or conduction, but simply because of the massive amount of working done in the rolling process.