COURSE: METAL CASTING. Module No. 6: PATTERNS
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1 COURSE: METAL CASTING Module No. 6: PATTERNS Lecture No-1 Patterns: Materials and Functions Pattern (Click on Fig to view a typical pattern) The pattern is not the exact replica of the object to be made by metal casting process but some modifications are provided on the pattern to take care of various process aspects such as shrinkage, hot tear, distortion, stress, core seat etc. For a hollow casting core patterns are needed to produce. The pattern can be made out of various material. The cost of the pattern is reflected on the cost of the casting. hence use of expensive pattern should be limited to the case when a large quantity of castings need to be produced. Functions of the Pattern 1. A pattern is used to prepares a mold cavity 2. For hollow casting core prints are added to the pattern to support the core in the mould cavity 3. Gates, Riser, and channels may become the part of the casting. however, in most of the cases they are not an integral part of the pattern 4. Efforts should be made to provide all allowances in a proper manner on the pattern and the surface of the pattern need to be made smooth. It results into less casting defects and low cost. 5. A properly constructed pattern minimizes the overall cost of the castings. Pattern Material The pattern can be made out of various material. Some of the materials used for making the patterns are wood, metals and alloys, plastic, plaster of Paris, plastic and rubbers, wax, and resins. the every material has its own advantages and disadvantages of being used as a pattern. In general the pattern material should posses the following characteristics:
2 1. Light in weight 2. Can be worked, shaped, and joined easily 3. Strong, hard and durable 4. Resistant to wear and abrasion 5. Resistant to corrosion, and to chemical reactions 6. Dimensionally stable and unaffected by variations inn temperaturee and humidity 7. Available at low cost The wood is the most favorable pattern material becausee of its availability in abundance and low weight. Also, it can be easily shaped and is relatively cheap. The main disadvantage of wood is that it absorbs moisture, as a result there is possibility of distortion and dimensional changes in the pattern. Hence, if wood is being used as a pattern material, the wood need to be properly seasoned. Types of Pattern Various types of patterns are being used in metal casting.
3 1. Single piece pattern 2. Split or two piecee pattern 3. Match plate pattern 4. Cope and drag pattern 5. Gated pattern 6. Sweep pattern 7. Skeleton pattern 8. Loose Piece Pattern Single Piece Pattern The single piece or one piece pattern is the most inexpensive of all types of patterns. This type of pattern is used where the object is simple and does not create any withdrawal problems. For prototype development a single piece pattern is most frequently used. This type of pattern is expected to be entirely in the drag and one of the surface is expected to be flat which is used as the parting plane. A typical one-piece pattern is shown inn Fig Split or Two Piece Pattern Two piece pattern is most common in metal casting industries. The pattern is split along the parting surface, the position of split is determined by the shape of the casting. One half of the
4 pattern is molded in drag and the other half in cope. The two halves of the pattern must be aligned properly by making use of the dowel pins, which are fitted, to the cope half of the pattern. These dowel pins match with the precisely made holes in the drag half of the pattern. A typical two piece or split pattern is shown in Fig Match Plate Pattern When there is requirement of large scale production of a small size casting, match plate pattern is a viable alternative. match plate pattern requires less time to adjust the location of the pattern in cope and drag. the cope and drag portion of pattern is mounted on a the opposite of wood or metal plate. Both the drag and cope can be prepared simultaneously by the use of the match plate pattern. A typical match plate pattern is shown in Fig
5 Cope and Drag Pattern The cope and drag parts of the pattern are mounted onn a separate plate of wood or metal. two different workers can used the individual pattern plate to produce the respective molding box, thus reducing the time for entiree mould production. A typical match plate pattern is shown in Fig
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