How does blacksmith change a piece of iron into different tools?
Answers
first he heat it at a very high temperature
after that using hand tools or power hammer he shape the metal into a rough shape of his design
after that he grinds the rough tool in perfect shape
after that he 'heat treats' the tool by heatin it at high temperature and then quenching in oil
and after sanding,grinding,polishing he gives it final touch...
First of all, pure iron is a metal that is really soft and malleable at high temperatures. Malleable means it can be hamerred into shapes without breaking (or cracking).
So why are iron objects hard? Well it's because they're not pure. They contain some amount of Carbon in them which makes the iron hard. So it's hard, even at high temperatures.
But pure iron, can be heated to high temperatures and changed into shapes (swords, axes, etc.). Pure iron means it has carbon content less than 0.08%
Carbon is what makes it hard (along with some other elements, in say, steel)
This is what a blacksmith does. (S)he heats the pure iron (usually Wrought iron but in modern times, steel as well) and changes it into various shapes. Heating is done in a Forge.
The process of changing into various shapes vary.
The blacksmith uses 'slags' to prevent rusting of the iron while process of smithing takes place and it also helps in forge welding.
(S)he also adds other metals for various purposes and does decorations and all. The final touch.
That's the summary of it.