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Plastics can be classifies into two broad categories - Thermosets and Thermoplasctics. A brief description of these two classes will be discussed here. Thermosets are the kind of plastics which are not recyclable. They undergo a kind of chemical change at the time of heating. As a result they can be shaped once because of this permanent chemical change. This process is known as heat hardening.

Cope and drag in Sand Mold : Cope and Drag are the two parts of the casting flask. Cope is the upper part and drag is the lower part. Even if the casting process is flaskless , the same terms are used for the upper ans lower parts. Generally the flask is made of wood or metal. It contains molding sand. When metal is poured into the mold cavity the flask supports the mold. Gating system:

Investment or lost-wax castings: The Lost-wax method, sometimes, also called simply as precision-investment casting has been used for many years by jewelers and dentists. Since world-war-II, the method has been adapted to the production of small and precise, industrial fasting. Basically, the method involves the use of expendable (heat disposable) pattern unrounded with a shell of refractory

We know that casting is the process of pouring molten metal in a desired shaped cavity and allowing it to solidify. After the solidification we get the desired shaped object. Please read : Comparison of different casting processes. What is casting ? Main application of castings Basic Steps of Sand casting Basic Operation of the casting process First we have to make a pattern Then the

Pattern allowances: There are some allowances which are responsible for the difference in the dimensions of the casting and the pattern. These allowances are considered when a pattern is designed for casting. In this article we will discuss those allowances - 1. Shrinkage allowance: After solidification of the metal from further cooling (room

Discovering Brazing (Braze Welding) Brazing is a gas welding process in which you join metals by using heat that surpasses the 800 degree Fahrenheit mark and a nonferrous (iron-free) filler rod with a melting temperature below that of the base materials. The most important point about brazing is that you can use it to join dissimilar metals — cast iron to steel, brass to steel, or copper to

Electrochemical Machining (ECM) is based upon Faraday's law of electrolysis. Faraday's law states that the the mass of a metal altered by the electrode is proportional to the quantity of electrical charges transferred to that electrode. In ECM the removal of metal is controlled by the anodic dissolution in the electrolyte. In ECM - The workpiece acts as the anode The tool act as cathode.

What is Match - Plate Pattern The match plate pattern is almost similar to the mounted pattern but it can have part of the casting in the cope and part in the drag like split piece pattern. These parts are generally attached to the plate / board in opposite sides in the perfect positions. When the plate is removed and mold is in close position the cavities in the cop and drag match perfectly.

Like all joining processes (in fact, like all processes!), welding offers several advantages but has some disadvantages as well. The most significant advantage of welding is undoubtedly that it provides exceptional structural integrity, producing joints with very high efficiencies. The strength of joints that are welded continuously (i.e.,full length, without intentional skipped areas) can easily

Aluminotherrnic welding is commonly known as Thermit welding. As a subset, these processes use the heat from highly exothermic chemical reactions of solid, particulate materials (or, occasionally, solid particles and a gas) to produce melting and joining, also called coalescence, between metals. Most often, the reactants employed are oxides with low heats of formation and metallic reducing

In this article we will be - Identifying common welding defects Preventing and fixing problems with your welds If I could wave my magic filler rod and make it so that all your welds would be strong, clean, and sharp-looking, I’d certainly do it. But the last time I went to the welding supply shop and asked to buy a magic filler rod, they looked at me like I was nuts, so for now you just have to

Here are some more questions about Industrial Engineering and production management. Actually Industrial Engineering are a part of Mechanical Engineering. That's why I'm posting these questions in this blog. Hope these questions will be helpful for any standard interview exam or viva. I will post some more mechanical engineering questions very soon. More interesting topics of mechanical

Here are some basic questions and answers about Industrial Production Engineering Hope these will help the students of IPE and Mechanical Engineering This is the part 2 of the series of questions. New posts with new questions will be posted regularly. Thanks . And comment in the respective sections for any query about mechanical engineering. If you want the explanation of the answers then you

Here are some basic questions and answers about Industrial Production Engineering Hope these will help the students of IPE and Mechanical Engineering This is the part 2 of the series of questions. New posts with new questions will be posted regularly. Thanks . And comment in the respective sections for any query about mechanical engineering. If you want the explanation of the answers then you

Here are some basic questions and answers about Industrial Production Engineering Hope these will help the students of IPE and Mechanical Engineering This is the part 2 of the series of questions. New posts with new questions will be posted regularly. Thanks . And comment in the respective sections for any query about mechanical engineering. If you want the explanation of the answers then you

Here are some basic questions and answers about Industrial Production Engineering Hope these will help the students of IPE and Mechanical Engineering This is the part 2 of the series of questions. New posts with new questions will be posted regularly. Thanks . And comment in the respective sections for any query about mechanical engineering. If you want the explanation of the answers then you

Here are some basic questions and answers about Industrial Production Engineering. Hope these will help the students of IPE and Mechanical Engineering. This is the part 1 of the series of questions. New posts with new questions will be posted regularly. Thanks . And comment in the respective sections for any query about mechanical engineering. If you want the explanation of the answers then you

What is Casting : Casting is one of the most ancient processes of manufacturing metallic components. Also with few exceptions it is the first step of manufacturing metallic components. The Basic steps of casting 1. Melting the metal. 2. Pouring it into a previously made mould or cavity which