Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133559897
Author: KALPAKJIAN
Publisher: PEARSON
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Textbook Question
Chapter 10, Problem 25QLP
Make a sketch of volume vs. temperature for a metal that shrinks when it cools from the liquid state to room temperature. On the graph, mark the area where shrinkage is compensated by risers.
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A slab of 1500 mm x 750 mm x 500 mm is required to be cast using a sand casting process. It was observed previously that the total solidification time (T) for this casting = 1.6 min. Find out the cylindrical riser dimensions (diameter to height ratio = 1) for a solidification time T = 5 min.
Chapter 10 Solutions
Manufacturing Engineering & Technology
Ch. 10 - Explain why casting is an important manufacturing...Ch. 10 - Why do most metals shrink when they are cast?Ch. 10 - What are the differences between the...Ch. 10 - What are dendrites? Why are they called so?Ch. 10 - Describe the difference between short and long...Ch. 10 - What is superheat? Is it important? What are the...Ch. 10 - Define shrinkage and porosity. How can you tell...Ch. 10 - What is the function of chills? What are they made...Ch. 10 - Why is the Reynolds number important in casting?Ch. 10 - What is a sprue? What shape should a sprue have if...
Ch. 10 - How is fluidity defined? Why is it important?Ch. 10 - Explain the reasons for hot tearing in castings.Ch. 10 - Why is it important to remove dross or slag during...Ch. 10 - Why is Bernoullis equation important in casting?Ch. 10 - Describe thixocasting and rheocasting.Ch. 10 - What is Chvorinovs Rule?Ch. 10 - How is a blister related to a scab?Ch. 10 - Is there porosity in a chocolate bar? In an ice...Ch. 10 - Describe the stages involved in the contraction of...Ch. 10 - Explain the effects of mold materials on fluid...Ch. 10 - It is known that pouring metal at a high rate into...Ch. 10 - Describe the events depicted in Fig. 10.5.Ch. 10 - Would you be concerned about the fact that...Ch. 10 - Review Fig. 10.8 and make a summary, explaining...Ch. 10 - Make a sketch of volume vs. temperature for a...Ch. 10 - What practical demonstrations can you suggest to...Ch. 10 - Explain why a casting may have to be subjected to...Ch. 10 - List and explain the reasons why porosity can...Ch. 10 - Why does porosity have detrimental effects on the...Ch. 10 - A spoked handwheel is to be cast in gray iron. In...Ch. 10 - Which of the following considerations are...Ch. 10 - Explain why the constant C in Eq. (10.7) depends...Ch. 10 - Are external chills as effective as internal...Ch. 10 - Explain why, as shown in Table 10.1, gray cast...Ch. 10 - Referring to Fig. 10.11, explain why internal...Ch. 10 - Note the shape of the two risers shown in Fig....Ch. 10 - Is there any difference in the tendency for...Ch. 10 - What is the influence of the cross-sectional area...Ch. 10 - It has long been observed that (a) low pouring...Ch. 10 - In casting metal alloys, what would you expect to...Ch. 10 - If you inspect a typical cube of ice, you are...Ch. 10 - How can you tell whether cavities in a casting are...Ch. 10 - Describe the drawbacks to having a riser that is...Ch. 10 - Reproduce Fig. 10.2 for a casting that is...Ch. 10 - List the process variables that affect the...Ch. 10 - Assume that you have a method of measuring...Ch. 10 - A round casting is 0.2 m (7.9 in.) in diameter and...Ch. 10 - A cylinder with a diameter of 2.0 in. and a height...Ch. 10 - The constant C in Chvorinovs rule is given as 2.5...Ch. 10 - Pure copper is poured into a sand mold. The metal...Ch. 10 - For the sprue described in Problem 10.58, what...Ch. 10 - When designing patterns for casting, pattern...Ch. 10 - Can you devise fluidity tests other than that...Ch. 10 - Figure P10.55 indicates various defects and...Ch. 10 - The fluidity test shown in Fig. 10.9 illustrates...Ch. 10 - Utilizing the equipment and materials available in...Ch. 10 - One method of relieving stress concentrations in a...Ch. 10 - Describe the effects on mold design, including the...Ch. 10 - Small amounts of slag often persist after skimming...Ch. 10 - Design an experiment to measure the constants C...
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- A compound thin cylinder has a common diameter of 100 mm, and the inner cylinder has a thickness of 2.5 mm. The radial pressure between the two cylinders is 200 KPa and the difference between the two common diameters before shrinkage was 0,004305 mm. E=200GPaarrow_forwardcompute the diameter of the sphere (mm) that will freeze in the same time in same casting process with a 62.5mm x 150mm x 225mm plate. Assume that constant mold for this casting is 55 mm^2/sarrow_forwardFor a sand casting a steel rectangular plate with dimensions 80mm x 120mm x 20mm. Calculate shrinkage and draft allowance. And draw the designed pattern. Assume shrinkage of material as 0.1% for 12 inch, pattern material is wood and assume suitable draft anglesarrow_forward
- A mould having dimensions 100 mm x 90 mm x 20 mm is filled with molten metal through a gate with height h and CS area A, the mould filling time is t1. The height is now quadrupled and the crosssectional area is halved. The corresponding filling time is t2 . What is the ratio t2/t1 ?arrow_forward01 : What is the difference between casting and forging process? Explain the three stages in casting process and its applications.arrow_forwardWhen designing patterns for casting, patternmakers use special rulers that automatically incorporate solid shrinkage allowances into their designs. For example, a 12-in. patternmaker’s ruler is longer than 1 foot. How long should a patternmaker’s ruler be for making patterns for (a) aluminum castings and (b) high-manganese steel?arrow_forward
- A aluminium alloy casting has a cylindrical geometry with 100mm in diameter and weighs 3200 gram. This casting takes 7.5 min to completely solidify. Another smaller and lighter cylindrical-shaped casting with the same diameterto-length ratio weighs 1800 gram. This casting is made of the same aluminium alloy and the same conditions of mold and pouring were used. Determinea) The mold constant in Chvorinov’s Rule,b) The dimensions of the lighter castingc) The total soldification time of the lighter casting. The density of aluminium alloy= 2.7 gram/cm3and n=2arrow_forwardA diesel component steel plate has a surface area of 200 in2 with a thickness of 0.002 in. DetermineHow many nickel atoms are required?How many nickel molds are requiredarrow_forwardA riser in the shape of a sphere is to be designed for a sand casting mould at Simon Castings. The casting is a rectangular plate, with length = 400 mm, width = 250 mm, and thickness = 15 mm. If the total solidification time of the casting itself is known to be 7 min, determine the diameter of the riser so that it will take 30% longer for the riser to solidify.arrow_forward
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