Metal Working: Historical Past, Improvement, Importance, Processes, Use In Daily Life
Metals are all over. Our appliances at our homes, the furniture in our offices, and the other structures that we see every time we go outdoors, all of these things are entirely or partially made of metal. This just goes to show how big of a part metals play in our lives.
The process of metal working began years and years ago. Even pre-historic men are believed to have practiced this method. Even if it is a little hard to trace how exactly metal working started, maybe we can all agree that it predates history. Imagine how life it would be like for the prehistoric men if they did not have metal tools to use for their cooking, hunting, and other activities. They were able to make sharp equipments and knives out of pieces of rocks and metals. Since then, the entire thing has evolved into something more sophisticated.
Generally, there are three categories of metal working. They are cutting, joining and forming. Each of these three processes even has smaller processes categorized under them.
1. Forming - it's done to deform or modify an object by applying pressure, heat, or mechanical force. There are several types of forming processes and some of them are: plastic deforming, casting, and sheet metal forming. Under sheet metal forming, you would get bending, roll forming, spinning, drawing, rolling, stamping, shearing, raising and decambering.
2. Cutting - this is done by removing some part of a material to change its physical appearance. The material would usually be cut into two pieces, the waste part and the finished part. Cutting has some sub-processes including machining, burning, drilling, threading, turning, grinding, and filing.
3. Joining - examples of joining operations are brazing, soldering and welding. In brazing, you would require to melt a filler metal and turn it into a capillary to assemble at least two work pieces. Once the filler metal comes into contact with the work pieces, it would solidify and make a tough and powerful joint. It's almost the same as soldering, but the former is done at temperature greater than 450 degrees Celsius. Soldering is performed at temperatures lower than 450 degrees Celsius. In welding, materials are joined by thermoplastics or metals. The work pieces are melted and are then added to the filler substance so some kind of a molten material pool is formed. This would then be left to cool to form a strong joint.
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