mechanical engineering

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

Die casting process is very different from sand casting as the mould used here is permanent. The mould is not expandable and need not to be broken after the cooling and solidification. Here the mould is called the die.  Please Read :  Comparison of different casting process  A complete Guide to casting process  Gravity die casting: When the molten is metal is poured under a gravity

Sand casting: In sand casting which is also known as sand molded casting, an object is produced by sand mold. The process involves pouring of the molten metal in to the mold cavity. The molten metal is then cooled to the room temperature. The metal is solidified. After cooling, the metal object is separated from the mold.  Sand casting process has its advantages and disadvantages. So care

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

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.

        In Water jet Machining no abrasive is used. Water jet alone is used for cutting. In WJM, materials like concrete, asbestos, wood, rocks, coal, textiles and leather can be cut. The material is removed by means of erosion. These days hydraulic coal mining as well as tunneling, descaling and cleaning is also done by this process.           Water Jet Machining (WJM) Principles  As

If it is assumed that a single process is good enough to approach practical problems in production then it is a total non-sense. There are a lot of methods useful for manufacturing goods. The most difficult part is selecting the right method of production. For manufacturing a product one should bear in mind its appropriate configuration, financial conditions and adequate supplies of materials and

Here are the Comparison of casting processes in a table. Thanks. Feel free to comment.  /* Font Definitions */ @font-face {font-family:Wingdings; panose-1:5 0 0 0 0 0 0 0 0 0;} @font-face {font-family:"Cambria Math"; panose-1:2 4 5 3 5 4 6 3 2 4;} @font-face {font-family:Calibri; panose-1:2 15 5 2 2 2 4 3 2 4;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal

Centrifugal casting process It is the method of producing castings where molten metal is poured into a  mould rapidly moving around a fixed axis. The molten metal come into contact with this rotating mould under a good amount of pressure because of the centrifugal force. This gives a better filling of mould. The casting grain density is also high.  As a result the porosity is almost zero.

Types of molding sand:     Green sand:                                  Natural sand with moisture  Dry sand:                                 Not suitable for large castings Facing sand: This sand is used directly next to the surface of the pattern and comes into contact with the molten metal when the mould is poured. As a result, it is subjected to the severest

According to the amount of clayey matter they contain, the molding sands are classified as: 1.       Silica Sand: 2.       Lean or weak sand : 3.       Moderately strong sand : 4.       Strong sand : 5.       Extra Strong sand (Loam sand) : Natural / green sand for casting : Natural sand is the one which is available from natural deposits. Only additives and water need be

Types of patterns: The following factors affect the choice of a pattern. (i)  Number of Castings to be produced. (ii)  Size and complexity of the shape and size of casting (iii)  Type of molding and castings method to be used. (iv)  Machining operation (v)  Characteristics of castings Different types of patterns: The common types of patterns are: 1)  Single piece pattern 2)  Split piece

A properly designed casting, a properly prepared mould and correctly malted metal should result in a defect free casting. However, if proper control is not exercised in the foundry-sometimes it is too expensive - a variety of defects may result in a casting. These defects may be the result of: (a) improper pattern design, (b) improper mould and core construction, (c) improper melting practice,

Pattern:  A replica of the  the final casting, used to form the mold cavity.         A pattern is an element used for making cavities in the mould, into which molten metal is poured to produce a casting. It is not an exact replica of the casting desired. There are certain essential differences. It is slightly larger than the desired casting, due to the various allowances (shrinkage

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