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Advantages And Disadvantages Of Casting

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1. Hot tear is a defect which happens during the solidification on a casting process. The steel is being poured at high temperature where the temperature is low relative to a high freezing temperature range. It results in which the steel starts to freeze after being poured. The remedy is to maintain a stable moderate temperature during the process.
2. Die casting requires a created die of the part to be cast. The die will be fitted to a machine and injected a pressure with a molten metal or alloy. The two application of die casting can be either hot chamber or cold chamber.
Centrifugal casting is a process of casting that delivers a very high material soundness. The application of this are in jet engine compressor, petrochemical furnace tubes …show more content…

The advantages of die casting are smooth cast surfaces, limiting or eliminates secondary machining operations, rapid production rates and tensile strength are high. However, its disadvantages are casting have a height requirement, high investment, limited to high-fluidity metals and porosity is common.
10. Single piece pattern is the simplest type, it is used for the production of large casting. In split pattern, the patterns are being split in more than two parts to facilitate the extraction of the pattern out of the mold. Sweep pattern is being used to cast a large size but to be produced in a limited time.
11. Permeability permits the steam to pass through the mold. Plasticity flows to all portion of the mold. Adhesiveness is a property that stick to the sides of the mold. Cohesiveness is a property that it stick together during the ramming process. Refractoriness enables the resistance of high temperature without breaking down or …show more content…

23. A low-pressure permanent-mold casting introduces the metal into a die by forcing it upward through a vertical tube.
24. Vacuum permanent-mold casting offers all the advantages of a low-pressure process which are clean metal, low turbulence and low dross, compensation for shrinkage, high yields and good mechanical properties.
25. In a low-pressure permanent-mold casting, its feeding pressures are on the order of 5 to 15 psi. However, in die casting, the metal is being forced into the molds by a pressure and is held under the pressure during the solidification.
26. Gravity permanent-mold dies are mostly made from gray cast iron which has a great resistance to the thermal fatigue and can machines easily. Die casting are usually made from hardened tool steels because the cast iron can’t withstand the casting pressures.
27.
28. Because the high pressures might cause a turbulence and air entrapment, lower injection pressure may be recommended which is followed by higher pressure after the mold has been filled and started to solidify.
29. Die-casting machines can’t be used for the higher-melting-point metals and the molted aluminum has a chance to pick up iron from the casting

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