EBK MANUFACTURING ENGINEERING & TECHNOL
7th Edition
ISBN: 9780100793439
Author: KALPAKJIAN
Publisher: YUZU
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Textbook Question
Chapter 11, Problem 20QLP
Why are risers not as useful in die casting as they are in sand casting?
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where are the die cores placed in die casting?
2. 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 Processes
Explain the Desirable Mold Properties in sand 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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- Why Venting holes and passageways must be built in die casting and not in sand casting? Why the cost of products reduce when increase the quantity? Why the actual size and shape of the cavity must be slightly oversized the product?arrow_forwardWhat is gating system in casting?arrow_forwardWhy the Lead is used in medical devices such as x-ray apparatus? Why the actual size and shape of the cavity must be slightly oversized the product? Why Venting holes and passageways must be built in die casting and not in sand casting?arrow_forward
- 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, when making a pattern? How do the patterns differ from the casting required?arrow_forward3) What are the means of elastic and plastic deformations? List the passageway (gating system) elements in sand casting moulds and show them with drawing?arrow_forwardWhich 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 mouldarrow_forward
- In 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_forwardWhat are some of the materials used to make casting patterns and their advantages and disadvantages no less than 3arrow_forwardWhich of these factors causes more porosity to form toward the interior of a casting rather than toward the outside? (a) Gasses are less soluble in the solid metal than the liquid, so solidified areas push dissolved gasses toward the interior. (b) Casting under a vacuum causes gasses near the liquid metal surface to be drawn out of the liquid during solidification. (c) The feeding structures of the mold are designed to force entrapped air into the center of the casting. (d) Draft on the mold wall forces air bubbles toward the interior of the solidifying metal. (e) None of the above Non-eutectic alloys (most commercial alloys) solidify over a temperature range. Which of the following statements explains how this affects the casting process. (a) Solidified non-eutectic alloys are especially difficult to remove from metal dies (b) Non-eutectic alloys have significantly less fluidity than pure metals or eutectic alloys. (c) Non-eutectic alloys solidify starting from the outside of the…arrow_forward
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