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7-Tripod.com.doc

? Student must include this instruction when submitting the assignment. ? Instruction: Read chapter 17 of ? Kalpakjian, Serope. Manufacturing Engineering and Technology Englewood Cliffs, NJ: Prentice Hall – Fourth Edition, 2001. ISBN # 0-201-36131-0 Complete the homework assignment below. Do not use attached file for homework assignment. You must copy and paste all data in your email. Type answer below each question. Reduce Grade: if the assignment is received after the due date, it will be deducted by 1 letter grade. NO grade will be assigned for homework with more than 7 days late or improper format as indicated above. ? ? ? Manufacturing?Processes - INMT-1249 - Assignment 07 ? ? ? ? QUESTIONS ? ? 17.1 Describe briefly the production steps involved in making powdermetallurgy parts. Answer (from page #_440____): ? Metal parts are made by compacting fine metal powders in suitable dies and sintering, that is, heating without melting. This process is called powder metallurgy (P/M).? 17.2 Name the various methods of powder production, and explain the types of powders produced. Answer (from page #__443,444___): ? 1. Atomization: The size of the particles formed depends on the temperature of the metal, the rate of flow, the nozzle size, and jet characteristics. In one variation of this method a consumable electrode is rotated rapidly in a helium-filled chamber. The centrifugal force breaks up the molten tip of the electrode into metal particles. Spherical (atomization Carbonyl (Fe), precipitation from a liquid) 2. Reduction: The powders produced by this method are spongy and porous, and they have uniformly sized spherical or angular shapes. 3. Electrolytic deposition: The powders produced are among the purest available. 4. Carbonyls: Powders are small, dense, uniformly spherical particles of high purity. 5. Comminution: Powder particles produced have angular shapes; with ductile metals, they are flaky, and they are not particularly suitab

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