Subject Name: MANUFACTURING PROCESS Subject Code: 10AE35 Prepared By: RAVISHANKAR. M & SUTHAN. R Department: AERONAUTICAL ENGINEERING Date 29/08/2014 11/11/2018

Topic details Jolt, squeeze types and sand slinger Special moulding process Sweep mould, CO2 mould Shell mould and investment mould Metal moulds: Gravity die casting, pressure die casting Centrifugal casting, squeeze casting Slush casting, thixocasting and continuous casting processes revision 11/11/2018

Casting Terms Flask: A metal or wood frame, without fixed top or bottom, in which the mold is formed. Depending upon the position of the flask in the molding structure, it is referred to by various names such as drag – lower molding flask, cope – upper molding flask, cheek – intermediate molding flask used in three piece molding. Pattern: It is the replica of the final object to be made. The mold cavity is made with the help of pattern. Parting line: This is the dividing line between the two molding flasks that makes up the mold. Molding sand: Sand, which binds strongly without losing its permeability to air or gases. It is a mixture of silica sand, clay, and moisture in appropriate proportions. Facing sand: The small amount of carbonaceous material sprinkled on the inner surface of the mold cavity to give a better surface finish to the castings. Core: A separate part of the mold, made of sand and generally baked, which is used to create openings and various shaped cavities in the castings. Pouring basin: A small funnel shaped cavity at the top of the mold into which the molten metal is poured. Sprue: The passage through which the molten metal, from the pouring basin, reaches the mold cavity. In many cases it controls the flow of metal into the mold. Runner: The channel through which the molten metal is carried from the sprue to the gate. Gate: A channel through which the molten metal enters the mold cavity. Chaplets: Chaplets are used to support the cores inside the mold cavity to take care of its own weight and overcome the metallostatic force. Riser: A column of molten metal placed in the mold to feed the castings as it shrinks and solidifies. Also known as “feed head”. Vent: Small opening in the mold to facilitate escape of air and gases. 11/11/2018

MOLD SECTION SHOWING CASTING TERMS 11/11/2018

Steps in Making Sand Castings There are six basic steps in making sand castings Patternmaking Core making Molding Melting and pouring Cleaning 11/11/2018

CASTING PROCESS Advantages Limitations Molten material can flow into very small sections so that intricate shapes can be made by this process. As a result, many other operations, such as machining, forging, and welding, can be minimized or eliminated. It is possible to cast practically any material that is ferrous or non-ferrous. As the metal can be placed exactly where it is required, large saving in weight can be achieved. The necessary tools required for casting molds are very simple and inexpensive. As a result, for production of a small lot, it is the ideal process. There are certain parts made from metals and alloys that can only be processed this way. Size and weight of the product is not a limitation for the casting process. Limitations Dimensional accuracy and surface finish of the castings made by sand casting processes are a limitation to this technique. Many new casting processes have been developed which can take into consideration the aspects of dimensional accuracy and surface finish. Some of these processes are die casting process, investment casting process, vacuum-sealed molding process, and shell molding process. The metal casting process is a labor intensive process 11/11/2018

Components produced by casting techniques Pulley casting Turbine blade casting 11/11/2018

11/11/2018 Pipe and valve casting

Crank shaft pattern making Casted crankshaft 11/11/2018

Subject Name: MANUFACTURING PROCESS Subject Code: 10AE35B Prepared By: RAVISHANKAR. M Department: AERONAUTICAL ENGINEERING Date 06/08/2014 Typical tank casting 11/11/2018

Subject Name: MANUFACTURING PROCESS Subject Code: 10AE35B Prepared By: RAVISHANKAR. M Department: AERONAUTICAL ENGINEERING Date 06/08/2014 11/11/2018 Tank hull casting

Subject Name: MANUFACTURING PROCESS Subject Code: 10AE35B Prepared By: RAVISHANKAR. M Department: AERONAUTICAL ENGINEERING Date 06/08/2014 Huge casting each barrel is more than 25 tonnes On left the barrel length=150 ft and right 60ft 11/11/2018

Subject Name: MANUFACTURING PROCESS Subject Code: 10AE35B Prepared By: RAVISHANKAR. M Department: AERONAUTICAL ENGINEERING Date 06/08/2014 11/11/2018

Subject Name: MANUFACTURING PROCESS Subject Code: 10AE35B Prepared By: RAVISHANKAR. M Department: AERONAUTICAL ENGINEERING Date 06/08/2014 Assorted castings 11/11/2018

Patterns Types of patterns Pattern-a tool used to produce the mould cavity. It’s a mould making tool. The shape of the pattern is same as that of the component or casting but its size will be slightly larger than the casting. Types of patterns Single piece pattern Multi-piece pattern Gated pattern Sweep pattern Skeleton pattern Shell pattern and Loose piece pattern 11/11/2018

Split or two piece pattern Subject Name: MANUFACTURING PROCESS Subject Code: 10AE35B Prepared By: RAVISHANKAR. M Department: AERONAUTICAL ENGINEERING Split or two piece pattern 11/11/2018

Gate pattern Skeleton pattern Loose pattern 11/11/2018

Subject Name: MANUFACTURING PROCESS Subject Code: 10AE35B Prepared By: RAVISHANKAR. M Department: AERONAUTICAL ENGINEERING Date 06/08/2014 Multi piece pattern 11/11/2018

Subject Name: MANUFACTURING PROCESS Subject Code: 10AE35B Prepared By: RAVISHANKAR. M Department: AERONAUTICAL ENGINEERING Date 06/08/2014 11/11/2018

A section or board (wooden) of proper contour that is rotated about one edge to shape mould cavities having shapes of rotational symmetry. This type of pattern is used when a casting of large size is to be produced in a short time. Large kettles of C.I. are made by sweep patterns. - See more at: http://mechanicalinventions.blogspot.com/2012/12/types-of-patterns.html#sthash.hyfnrlDk.dpuf 11/11/2018