Engineering Content
All of the workshop engineer’s energy is directed towards some aspect of changing the shape of the metal, and we will now discuss the general issue of hot and cold working. Cold working means subjecting the metal to forces that cause it to undergo plastic deformation when it is below the lowest critical temperature (perlite…
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The purposes of annealing are (1) To soften steel so it can be machined more easily (2) To relieve internal stresses that may have been caused by metalworking or uneven shrinkage in the casting. The process involves (A) Heat slowly to the required temperature (B) Holding at this temperature long enough to allow internal changes…
In the past, a great deal of heat treatment, mainly of tools, was done in a blacksmith’s fire, and even today this method is still used in some places. At best, however, this heating method is unreliable, as for all but small tools the heating is not uniform and, more importantly, estimating the correct temperature…
What are the different Mechanical properties of metals? Following are the Mechanical Properties of Metals Brittleness It is the property of breaking without not too much permanent distortion. It may be due to the fragility of the grain boundaries or the crystals themselves. Cast iron is brittle because its structure is broken up by chips…
Precise relative movement of the tool relative to the workpiece is necessary to carry out the desired machining process. Motion control systems in Numerical Control (NC) machining systems can be categorized into three basic types: point-to-point, straight cut, and contour. 1. NC point to point This type of motion control system is also known as…