Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Chapter 5, Problem 34QLP
Recent research has identified mold-surface textures that will either (a) inhibit a solidified steel from separating from the mold or (b) force it to stay in contact in continuous casting. What is the advantage of a mold that maintains intimate contact with the steel?
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Students have asked these similar questions
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.
A flat plate is to be cast in an open mold
whose bottom has a square shape that is 200
mm by 200 mm. The mold is 40 mm deep. A
total of 106 mm3 of molten aluminum is
poured into the mold. Solidification
shrinkage is known to be 6.0%. The linear
shrinkage due to thermal contraction after
solidification is 1.3%. If the availability of
molten metal in the mold allows the square
shape of the cast plate to maintain its 200
mm by 200 mm dimensions until
solidification is completed, determine the
final dimensions of the plate.
Which 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…
Chapter 5 Solutions
Manufacturing Engineering & Technology
Ch. 5 - What are the major categories of ferrous alloys?Ch. 5 - Prob. 2RQCh. 5 - List the basic raw materials used in making iron...Ch. 5 - List the types of furnaces commonly used in...Ch. 5 - List and explain the characteristics of the types...Ch. 5 - Prob. 6RQCh. 5 - What is continuous casting? What advantages does...Ch. 5 - What is the role of a tundish in continuous...Ch. 5 - Prob. 9RQCh. 5 - What are trace elements?
Ch. 5 - What are the percentage carbon contents of...Ch. 5 - Prob. 12RQCh. 5 - Prob. 13RQCh. 5 - Prob. 14RQCh. 5 - Prob. 15RQCh. 5 - What is high-speed steel?Ch. 5 - Prob. 17RQCh. 5 - Prob. 18RQCh. 5 - Prob. 19RQCh. 5 - What effect does carbon content have on mechanical...Ch. 5 - Identify several different products that are made...Ch. 5 - Professional cooks generally- prefer carbon-steel...Ch. 5 - Prob. 23QLPCh. 5 - Explain why continuous casting has been such an...Ch. 5 - Describe applications in which you would not want...Ch. 5 - Explain what would happen if the speed of the...Ch. 5 - The cost of mill products of metals increases with...Ch. 5 - Describe your observations regarding the...Ch. 5 - Prob. 29QLPCh. 5 - Prob. 30QLPCh. 5 - In Table 5.9, D2 steel is listed as a more common...Ch. 5 - List the common impurities in steel. Which of...Ch. 5 - Explain the purpose of the oil shown at the top...Ch. 5 - Recent research has identified mold-surface...Ch. 5 - Prob. 35QLPCh. 5 - List and explain the advantages and disadvantages...Ch. 5 - Conduct an Internet search and determine the...Ch. 5 - Refer to the available literature, and estimate...Ch. 5 - Some soft drinks are now available in steel cans...Ch. 5 - Using strength and density data, determine the...Ch. 5 - The endurance limit (fatigue life) of steel is...Ch. 5 - Using the data given in Table 5.4, obtain the...Ch. 5 - Based on the information given in Section 5.5.1,...Ch. 5 - Assume that you are in charge of public relations...Ch. 5 - Assume that you are in competition with the steel...Ch. 5 - In the past, waterfowl hunters used lead shot in...Ch. 5 - Aluminum is being used as a substitute material...Ch. 5 - In the 1940s (the Second World War), the Yamato...Ch. 5 - Search the technical literature, and add more...Ch. 5 - Referring to Fig. 5.4a, note that the mold has...
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- A flat plate is to be cast in an open mold whose bottom has a square shape of 12.5 cm by 12.5 cm. The mold is 7.0 cm deep. A total of 350 cm³ of molten aluminum is poured into the mold. Solidification shrinkage is known to be 6.25%, which is a volumetric contraction, not a linear contraction. Table 7.1 lists the linear shrinkage due to thermal contraction after solidification. If the availability of molten metal in the mold allows the square shape of the cast plate to maintain its square dimension until solidification is completed, determine the final dimensions (width and height) of the plate.arrow_forwardA riser in the shape of a sphere is to be designed for a sand casting mold. The casting is a rectangular plate, with length = 100 mm, width = 50 mm, and thickness = 10 mm. If the total solidification time of the casting itself is known to be 2.5 min, determine the diameter of the riser so that it will take 20% longer for the riser to solidify. %3D %3!arrow_forwarda riser in the shape of a sphere is to be designed for a sand casting mold. the casting is a rectangular plate, with length 200mm, width 100mm, and thickness 18mm. if the total solidification time of the casting itself is known to be 3.5 mm, determine the diameter of the riser so that it will take 25% longer for the riser to solidify. assume a value of 2 for ‘n’ m( the exponent in chvorinov’s rule). know the volume and surface area of a sphere.arrow_forward
- (3):-The suitable type of casting to making tubs and cylinders is by a --- a- Lost wax casting b- Centrifugal casting c- Sand casting d- Continuous casting (4):- The surface of product Extruded by ----- Extrusion process has high smooth a- Hot b- Cold e- Warm (5):- High temperature leads to ----- he metal's ability to form a- Decreases b- Increases c- Non affected onarrow_forward(b) In casting experiments performed using a certain alloy and type of sand mould, for which n can be approximately taken as 2, it took 155 sec for a cube-shaped casting to solidify. The cube was 50 mm per side. (i) Determine the value of the mould constant in Chvorinov's rule. (ii) When the same alloy and mould type are used to make a cylindrical casting of diameter 30 mm, what is the maximum length of the cylinder if the maximum solidification time is limited to 1 minute?arrow_forwardWhat is a pattern? What are the consideration necessary while designing pattern in casting?arrow_forward
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