Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Textbook Question
Chapter 17, Problem 28QLP
Because they undergo special processing, metal powders are more expensive than the same metals in bulk form, especially powders used in powder-injection molding. How is the additional cost justified in processing powder metallurgy parts?
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Chapter 17 Solutions
Manufacturing Engineering & Technology
Ch. 17 - Describe briefly the production steps involved in...Ch. 17 - Name the various methods of powder production and...Ch. 17 - Explain why metal powders may be blended.Ch. 17 - Describe the methods used in metal powder...Ch. 17 - What is isostatic pressing? How is it different...Ch. 17 - What hazards are involved in PM processing?...Ch. 17 - Describe what occurs to metal powders during...Ch. 17 - Prob. 8RQCh. 17 - Why might secondary and finishing operations be...Ch. 17 - Prob. 10RQ
Ch. 17 - Prob. 11RQCh. 17 - Prob. 12RQCh. 17 - Prob. 13RQCh. 17 - What is screening of metal powders? Why is it...Ch. 17 - Why are protective atmospheres necessary in...Ch. 17 - Why is there density variation in the compacting...Ch. 17 - What is the magnitude of the stresses and forces...Ch. 17 - List the similarities and differences of forging...Ch. 17 - Give some reasons that powder-injection molding is...Ch. 17 - How does the equipment used for powder compaction...Ch. 17 - Explain why the mechanical and physical properties...Ch. 17 - What are the effects of the different shapes and...Ch. 17 - Describe the relative advantages and limitations...Ch. 17 - How different, if any, are the requirements for...Ch. 17 - The powder metallurgy process can be competitive...Ch. 17 - What are the reasons for the shapes of the shown...Ch. 17 - Should green compacts be brought up to the...Ch. 17 - Because they undergo special processing, metal...Ch. 17 - In Fig. 17.12, it can be seen that the pressure is...Ch. 17 - Why do the compacting pressure and the sintering...Ch. 17 - What will be stronger: a blend of stainless steel...Ch. 17 - Name the various methods of powder production and...Ch. 17 - Estimate the maximum tonnage required to compact a...Ch. 17 - Refer to Fig. 17.11a. What should be the volume of...Ch. 17 - Determine the shape factors for (a) a cylinder...Ch. 17 - Estimate the number of particles in a 500-g sample...Ch. 17 - Prob. 37QTPCh. 17 - A coarse copper powder is compacted in a...Ch. 17 - A gear is to be manufactured from iron powders. It...Ch. 17 - What volume of powder is needed to make the gear...Ch. 17 - The axisymmetric part shown in Fig. P17.41 is to...Ch. 17 - Prepare an illustration similar to Fig. 13.1,...Ch. 17 - Prob. 44SDPCh. 17 - Compare the design considerations for PM products...Ch. 17 - Prob. 46SDPCh. 17 - Prob. 47SDPCh. 17 - Using the Internet, locate suppliers of metal...Ch. 17 - Explain why powder metal parts are commonly used...Ch. 17 - Prob. 50SDPCh. 17 - Describe how the information given in Fig. 17.15...Ch. 17 - It was stated that, in the process shown in Fig....Ch. 17 - Prob. 53SDPCh. 17 - The axisymmetric parts shown in Fig. P17.54 are to...Ch. 17 - Assume you are working in technical sales. What...
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- Justify the addition of lubricants to powders in blending operationarrow_forwardDiscuss the effect of monomodal and bimodal particle size distribution of powderson the microstructure and properties of advanced ceramics. Which starting powders would youprefer and WHY?arrow_forward1) How does the ease of tool locating and clamping affects the design efficiency? Give some examples of design of powder metallurgical partsarrow_forward
- What are some P/M (powder metallurgy) products that have been intentionally designed to use the porosity or permeability features of the process?arrow_forwardWhat happens in the powder mixture if granulation is over wetted and under wetted? How can this be prevented?arrow_forwardMoulds for blow moulding can be made using aluminium whereas moulds for injection moulding are usuallymade out of tool steel, why?arrow_forward
- The part shown in Figure is to be pressed from fine copper powders using a compaction pressure of 1000 MPa. Dimensions are milimetres. Determinea) the required press tonnage to perform this operationb) the final weight of the part if the porosity is 15%. Assume shrinkage during sintering can be neglected. (the desity of copper =8,97g/cm3 )arrow_forwardGKN Sinter Metals Company pressed iron powders using a compaction pressure of 600 MPa to produced a cylindrical bearing which is 70 cm long and has internal and external diameters of 8 cm and 16 cm, respectively. Determine (a) the most appropriate pressing direction, (b) the required press tonnage to perform this operation, and (c) the final weight of the part if the porosity is 12%, given that the density of iron, ρ = 7.87 g/cm3. Assume shrinkage during sintering can be neglectedarrow_forwardWhich law of thermodynamics best apply to compression molding machine? Explain why.arrow_forward
- Should green compacts be brought up to the sintering temperature slowly or rapidly? Explain your reasoning.arrow_forwardIn solid state sintering of compacted metal powder material, discuss how the progress of microstructure changes in sintering can be observed by microscopy. Support your discussion with suitable schematic diagram.arrow_forward5. What are some of the reasons why plastic shaping processes are important?arrow_forward
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