EBK MANUFACTURING ENGINEERING & TECHNOL
7th Edition
ISBN: 8220100793431
Author: KALPAKJIAN
Publisher: PEARSON
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Textbook Question
Chapter 11, Problem 24QLP
Why is the investment-casting process capable of producing fine surface detail on castings?
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Students have asked these similar questions
Which among the following design considerations for casting to be followed to reduce stress concentration in parts?
O a. Shape the casting for orderly solidification
O b. Avoid abrupt changes in cross section
Oc Avoid thin sections
O d. Make provision for easy removal of pattern from the mould
State the steps that must be taken to correct the following casting defects:
1. Formation of discontinuity in the casting.-
2. Cast surface consisting of a mixture of sand and metal.
3. Casting with balloon-shaped gas cavity near the surface.
4. Formation of hot tearing in expandable and permanent mold casungs.
5. Metal splatters during pouring and solid globules form and become entrapped in
casting.
Why are aluminum and copper alloys unsuitable for use in hot chamber die casting
Chapter 11 Solutions
EBK MANUFACTURING ENGINEERING & TECHNOL
Ch. 11 - Describe the differences between expendable and...Ch. 11 - Name the important factors in selecting sand for...Ch. 11 - What are the major types of sand molds? What are...Ch. 11 - List important considerations when selecting...Ch. 11 - What is the function of a core?Ch. 11 - What is the difference between sand-mold and...Ch. 11 - What are composite molds? Why are they used?Ch. 11 - Describe the features of plaster-mold casting.Ch. 11 - Name the type of materials typically used for...Ch. 11 - What are the advantages of pressure casting over...
Ch. 11 - List the advantages and limitations of die...Ch. 11 - What is the purpose of a riser? What is a blind...Ch. 11 - Explain the purpose of a vent and a runner in a...Ch. 11 - How are shell molds produced?Ch. 11 - What keeps the mold together in vacuum casting?Ch. 11 - What is squeeze casting? What are its advantages?Ch. 11 - What are the advantages of the lost-foam casting...Ch. 11 - Prob. 18RQCh. 11 - What are the reasons for the large variety of...Ch. 11 - Why are risers not as useful in die casting as...Ch. 11 - Describe the drawbacks to having a riser that is...Ch. 11 - Why can blind risers be smaller than open-top...Ch. 11 - Why does die casting produce the smallest cast...Ch. 11 - Why is the investment-casting process capable of...Ch. 11 - What differences, if any, would you expect in the...Ch. 11 - Recently, cores for sand casting have been...Ch. 11 - Would you recommend preheating the molds used in...Ch. 11 - Give reasons for, and examples of, using die...Ch. 11 - Referring to Fig. 11.3, do you think it is...Ch. 11 - Explain why squeeze casting produces parts with...Ch. 11 - How are the individual wax patterns attached on a...Ch. 11 - Describe the measures that you would take to...Ch. 11 - You have seen that, even though die casting...Ch. 11 - How are hollow parts with various cavities made by...Ch. 11 - It was stated that the strength-to-weight ratio of...Ch. 11 - How are risers and sprues placed in sand molds?...Ch. 11 - In shell-mold casting, the curing process is...Ch. 11 - Why does the die-casting machine shown in Fig....Ch. 11 - Prob. 39QLPCh. 11 - What are the benefits to heating the mold in...Ch. 11 - The slushy state of alloys refers to that state...Ch. 11 - Can a chaplet also act as a chill? Explain.Ch. 11 - Rank the casting processes described in this...Ch. 11 - Estimate the clamping force for a die-casting...Ch. 11 - In sand casting, it is important that the...Ch. 11 - If an acceleration of 100 g is necessary to...Ch. 11 - A jeweler wishes to produce 24 gold rings in one...Ch. 11 - Describe the procedures that would be involved in...Ch. 11 - The optimum shape of a riser is spherical to...Ch. 11 - Sketch and describe a casting line consisting of...Ch. 11 - Outline the casting processes that would be most...Ch. 11 - Make a list of the mold and die materials used in...Ch. 11 - Write a brief paper on the permeability of molds...Ch. 11 - Light metals commonly are cast in vulcanized...Ch. 11 - It sometimes is desirable to cool metals more...Ch. 11 - The part shown in Fig. P11.59 is a hemispherical...Ch. 11 - Porosity that has developed in the boss of a...Ch. 11 - In Fig. II.1b the gemstones have been cast in...
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- I need the answer as soon as possiblearrow_forwardE) How can evacuated the hot gases formed by reactions of the molten metal in sand casting? F) How can evacuated the hot gases formed by reactions of the molten metal in die casting? G) What is the cooling curve, expain with drawing the curve? H) Explain briefly the mechanism of hot-chamber machine in die casting process? I) Explain briefly the mechanism of Cold-chamber machine in die casting process?arrow_forwardWhat are some of the materials used to make casting patterns and their advantages and disadvantages no less than 3arrow_forward
- What would you do to improve the surface finish in expendable-mold casting processes?arrow_forwardQUESTION 1 a) Explain what is the basic difference between expendable and permanent molds used in metal casting? Briefly also describe what are the primary advantage and disadvantage of each these two types of molds? (CO1, PO1, C2) b) Describe the steps involved in making the sand mold and the casting, including what steps that may be needed to improve the casting after it is hardened and removed? (C01, PO1, C2) c) One of Open Mold processes for shaping fibre reinforced plastics (FRP) is Hand Lay Up. List the five (5) steps involved in the Hand Lay Up method? (CO2, PO1, C2`arrow_forwardWhen precision services are required on castings which casting processes are most likely to need a secondary operation subsequent to casting?arrow_forward
- Manufacturing Processes How to perform the sand casting of hollow piece and how to verify the calculated solidification time?arrow_forward2. What do the various elements that comprise the gating system? what are the pouring basin in a sand casting? 3. Explain why a sprue should be tapered? 4. What are the disadvantages of die casting? 5. Explain the various kinds of patterns in use. What are the allowances provided How do the patterns differ from the casting required? 6. Define Expendable-mold, Expendable-pattern Casting Processesarrow_forwardWhich casting process is the most important commercially?arrow_forward
- requirement : a good understandable handwriting and answer in step by step procedure with good arrangementarrow_forwardIn turbine blade casting, how is a single-crystal structure achieved? Select one or more: a. By using a curving coil-like channel in the casting mould b. By removing grain boundaries by hot working and recrystallisation c. By careful control of the temperatures of the mould d. By introducing impurities into the molten alloy in the mouldarrow_forward3. (Slow or Fast, which one? – Circle one) cooling rates results in coarse dendritic structures. 4. The higher the viscosity of the melt, the . its fluidity? 5. Name 3 defects in casting: 6. Internal or external are an effective means of reducing shrinkage porosity during solidification. 7. Is green-sand molding expensive? 8. .... are inserts placed in the molds to form the hollow regions in casting. 9. The method of casting turbine blades: Sample A 10. Which one has higher stiffness? Sample A or Sample B Sample B 11. Which one has higher toughness? Sample A or Sample B 12. Which one has higher strength? Sample A or Sample B 13. Which one has higher ductility? Sample A or Sample 14. Higher ......... means more rigidity. Strain 15. Before the no-slip point, the velocity is (higher or lower, which one? - Circle one) 16. In flat-rolling process, using smaller diameter rolls (increases or decreases, which one? - Circle one) the roll force. 17. Balls for ball bearings can be made by rolling…arrow_forward
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