Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Chapter 17, Problem 38QTP
A coarse copper powder is compacted in a
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Granule strength is very important in pressing powders.
The force applied to a granule with a radius of 1 mm is 0.5 Newton. Calculate the breaking
strength of the granule.
b) It is observed that the pressed granules break easily during pressing. Write down the reasons
of this situation and what would you take precations to solve this problem? Why? (please write
down 3 precautions with reasons).
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For a powder binding process that mixes a 3:1 volume ratio mixture of semi-crystalline polyethylene powder with a density of 0.900
g/cm³ and crystalline polyethylene powder, what is the percent crystallinity of the manufactured parts? (The density of polyethylene in
its amorphous and crystalline states is 0.870 g/cm³ and 0.998 g/cm³ respectively)
O a. % Crystallinity = 45.96%
O b. % Crystallinity=55.25%
O c. % Crystallinity = 53.35%
O d. % Crystallinity = 61.20%
Oe. % Crystallinity = 35.50%
3
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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- For a powder binding process that mixes a 3:1 volume ratio mixture of semi-crystalline polyethylene powder with a density of 0.900 g/cm3 and crystalline polyethylene powder, what is the percent crystallinity of the manufactured parts? (The density of polyethylene in its amorphous and crystalline states is 0.870 g/cm3 and 0.998 g/cm3 respectively) a. % Crystallinity = 35.50% b. % Crystallinity = 55.25% c. % Crystallinity = 53.35% d. % Crystallinity = 61.20% e. % Crystallinity = 45.96%arrow_forwardFor a powder binding process that mixes a 1:2 volume ratio mixture of semi-crystalline polyethylene powder with a density of 0.900 g/cm³ and crystalline polyethylene powder, what is the percent crystallinity of the manufactured parts? (The density of polyethylene in its amorphous and crystalline states is 0.870 g/cm³ and 0.998 g/cm³ respectively) (This question has only one correct answer) О а. % Crystallinity = 55.45% O . % Crystallinity = 57.25% О с. % Crystallinity = 76.99% Od. % Crystallinity = 82.30% % Crystallinity = 65.50%arrow_forwardFor a powder binding process that mixes a 1:2 volume ratio mixture of semi-crystalline polyethylene powder with a density of 0.900 g/cm³ and crystalline polyethylene powder, what is the percent crystallinity of the manufactured parts? (The density of polyethylene in its amorphous and crystalline states is 0.870 g/cm3 and 0.998 g/cm3 respectively) (This question has only one correct answer) O a. % Crystallinity = 65.50% O b. % Crystallinity = 57.25% С. % Crystallinity = 82.30% O d. % Crystallinity = 76.99% е. % Crystallinity = 55.45%arrow_forward
- In powder processing, a cylinder with a diameter of 2 inches and a height of 10 inches is to be made from fine copper powders. A single-action press is used for compaction. If the average density of the green product is 7 g/cm3 at the bottom half of the cylinder, estimate the compaction pressure at the punch surface. Assume no friction between the powders. The coefficient of friction between particles and containers is 0.2.arrow_forwardThe part shown in Figure is to be pressed from fine copper powders using a compaction pressure of 1000 MPa. Dimensions are milimetres. Determine a) the required press tonnage to perform this operation b) 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 ) 65 30 25 12 20arrow_forwardYour die setter brings you a print of a cylinder with a 2 inch outside diameter and a 1.75 inch inside diameter. The cylinder is to be molded of iron powder with a green density of 6.8 g/cc. The apparent density of the powder is 2.9 g/cc. What is the die fill if the green part is to have a height of 2.5 inches? (show your work)arrow_forward
- 2arrow_forwardFor a powder binding process that mixes a 3:1 volume ratio mixture of semi-crystalline polyethylene powder with a density of 0.900 g/cm³ and crystalline polyethylene powder, what is the percent crystallinity of the manufactured parts? (The density of polyethylene in its amorphous and crystalline states is 0.870 g/cm³ and 0.998 g/cm³ respectively)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_forward
- in the outside shape of the casting can be round, octagonal, hexagonal, and so on. However, the inside shape of the casting is (theoretically) perfectly round, due to the radially symmetric forces at work Squeeze casting O centrifugal casting O Expanded polystyrene process semi centrifugal casting centrifuge casting die casting O shell casting low pressure casting Plaster-mold casting.arrow_forwardManufacturingarrow_forwardA thin steel disk of an oil separator of 100mm outside diameter is shrunk onto a solid steel shaft of 20mm diameter. The system is to be designed to make sure the disc does not become loose at speeds lower than 100000rev/min. Determine the shrinkage allowance required in order to avoid separation disc and shaft, at a speed of 100000rev/min. For the material assume a Young's Modulus, Poisson Ratio and density of 210GPa, 0.3 and 7850kg/m³ respectively.arrow_forward
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