Mechanical Engineering & Documents

For making pattern, allowance is take in consideration for perfect sand casting . 1. Shrinkage or Contraction allowance In cooling process, all metal shrinkage during solidification and contract. To compensate this problem, some allowance is provided in pattern so that final casting is as per required. This type of allowance is known as Shrinkage or Contraction allowance. This allowance is further classified in two type. i. Liquid Shrinkage Reduction in volume of metal during change from liquid to solid form. To compensate this problem, riser is use. Riser feed liquid material when required. ii. Solid Shrinkage Reduction in volume when metal loose temperature. To compensate this problem, allowance is provided in pattern. 2. Draft or Taper allowance This allowance is provided in all vertical surface of pattern so that pattern is remove easily without tear or break the side of mold. 3. Distortion or Camber allowance During cooling process, stress will generate. Due...

Below terminology is use in Sand Casting . 1. Sand Mold Molds are provided with a cavity of shape of desired product. 2. Pattern Pattern is used to generate cavity in mold. It is also called as replica of final product. 3. Core It is use to generate hole and internal cavities in casting. 4. Cope In horizontal molding, top half part of mold is called cope. 5. Drag In horizontal molding, bottom half part of mold is called drag. 6. Swing In vertical molding, leading half part of mold is called swing. 7. Ram In vertical molding, back half part of mold is called ram. 8. Core Box Additional pattern required for core is known as a core box. 9. Molding Molding is a operation to prepare mold. 10. Ladle It is use to transfer molten metal to mold from furnace. 11. Melting & Pouring Melting and pouring is a process of preparing molten metal with proper composition and temperature and poured into the mold. 12. Gates It is a portion of runner where molten...

Definition of Die Casting: Die casting is a process of producing metal part by forcing molten metal at high pressure into the mold cavity. Mold cavity is made from two hardened tool steel die. This mold cavity is previously machined to required die casting product. Working of die casting is based on injection process. Type of Die Casting: Cold Chamber Die Casting Hot Chamber Die Casting Process of Die Casting: 1. Clamping In this step both die cavity is cleaned and then clamp with high pressure. 2. Injection Molten metal is injected by force into the die cavity using very high pressure. This high pressure is hold till time required for solidify. 3. Cooling After injecting the molten metal, it must required time for solidify and cool. During this process die can not un clamp . 4. Ejection When metal is solidify then die cavity is unclamp and ejection mechanism push casting out from die. 5. Trimming In this process, excess material is remove...

Definition of Pattern: Pattern is a replica of the required casting to be cast. Pattern is used to create a cavity in mold into which molten metal is poured during the casting process. This pattern is used in sand casting process. Material used for Patten: Wood Metal Plastic Thermocol Wax (In Special Case) Plaster of Paris (In Special Case) Type of Pattern: Single Piece Pattern Split or two piece pattern Match plate pattern Cope & Drag Pattern Gated Pattern Sweep Pattern Skeleton Pattern Shell Pattern Loose Piece Pattern Flow Board Pattern Loose Piece Pattern Segmental Pattern Left & Right Hand Pattern Lagged-up Pattern Built Type Pattern Pattern Allowances

Sand casting is a process in which required molten metal is poured with required temperature into the sand mold. Which type of casting can manufacture from sand casting process? This process is used to produce wide verity of casting and complex in geometry. Size of this kind of casting is very from small to very large. Process of sand casting: Create Pattern for Desired Casting only one time Using Pattern, build Sand Mold in Mold Box with proper getting system Remove pattern and clamp Mold Cavity Pour molten metal in Mold Cavity Give time to pouring material for cooling Break sand mold and getting casting out Terminology use in Sand Casting

Casting is a manufacturing process in which liquid material is going to poured in mold/cavity, which is hollow cavity of desired shape and size and then give time to solidify. This solidification part is known as Casting.After solidification casting is pull out from mold/cavity for compete the process. Types of Casting Process: Sand Casting Die Casting Shell Mold Casting Permanent Mold Casting Investment Casting (Lost Wax Casting) Lost-Foam Casting Centrifugal Casting Continuous Casting

Manufacturing process is a method through which raw material is transformed in finish good by doing physical and/or chemical process. There are many way to get finish product / goods. List of manufacturing process as per below: Casting Forming Coating Machining Joining Moulding