Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Textbook Question
Chapter 12, Problem 3RQ
What is shrinkage allowance? Machining allowance?
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QUESTION 2
A material is required for a new product with fixed
geometry that will be shaped by moulding. The
product should be cheap to make, easily recycled
and needs reasonable strength. What type of
material would you choose for the product and
why?
For the toolbar, press ALT+F10 (PC) or
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Question: 1. The Blank For The
Spool Shown In Fig. Below Is To Be
Sand Cast Out Of A-319, An...
1. The blank for the spool shown in Fig. below is to be sand cast out of A-319,
an aluminum casting alloy. Make a sketch of the wooden pattern for this
part, and include all necessary allowances for shrinkage and machining.
12.5 mm
12.0 mm
75.0 mm
100.0 mm -
2.( - The blank for the spool shown in the figure below is to be
sand cast out of A-319, an aluminum casting alloy. Make a sketch of
the wooden pattern for this part. Include all necessary allowances for
shrinkage and machining
Shrinkage allowance = 10-20 mm/m,
Machining allowance = 2 mm.
Draft=30)
10 mm
100 mm
25 mm diameter
O
15 mm
75 mm
Chapter 12 Solutions
Manufacturing Engineering & Technology
Ch. 12 - Why are steels more difficult to cast than cast...Ch. 12 - What is the significance of hot spots in metal...Ch. 12 - What is shrinkage allowance? Machining allowance?Ch. 12 - Explain the reason for drafts in molds.Ch. 12 - Prob. 5RQCh. 12 - What are light castings and where are they used...Ch. 12 - Name the types of cast irons generally available,...Ch. 12 - Comment on your observations regarding Fig. 12.5.Ch. 12 - Describe the difference between a runner and a...Ch. 12 - What is the difference between machining allowance...
Ch. 12 - What is dross? Can it be eliminated?Ch. 12 - Describe your observation concerning the design...Ch. 12 - If you need only a few castings of the same...Ch. 12 - Do you generally agree with the cost ratings in...Ch. 12 - Describe the nature of the design differences...Ch. 12 - Note in Fig. 12.5 that the ductility of some cast...Ch. 12 - Do you think that there will be fewer defects in a...Ch. 12 - Explain the difference in the importance of drafts...Ch. 12 - What type of cast iron would be suitable for...Ch. 12 - Explain the advantages and limitations of sharp...Ch. 12 - Explain why the elastic modulus, E, of gray cast...Ch. 12 - If you were to incorporate lettering or numbers on...Ch. 12 - The general design recommendations for a well in...Ch. 12 - The heavy regions of parts typically are placed in...Ch. 12 - What are the benefits and drawbacks to having a...Ch. 12 - When designing patterns for casting, patternmakers...Ch. 12 - Using the information given in Table 12.2, develop...Ch. 12 - The part in Figure P12.28 is to be cast of 10% Sn...Ch. 12 - Describe the general design considerations...Ch. 12 - Add more examples of applications to those shown...Ch. 12 - Explain how ribs and serrations are helpful in...Ch. 12 - List casting processes that are suitable for...Ch. 12 - Small amounts of slag and dross often persist...Ch. 12 - If you need only a few units of a particular...Ch. 12 - For the cast metal wheel illustrated in Fig....Ch. 12 - Assume that the introduction to this chapter is...Ch. 12 - In Fig. P12.37, the original casting design shown...Ch. 12 - An incorrect and a correct design for casting are...Ch. 12 - Using the method of inscribed circles, shown in...Ch. 12 - A growing trend is the production of patterns and...Ch. 12 - Repeat Problem 12.40 for the case where (a) a...
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- 6. In reverse drawing, the shape change is significant enough (e.g., drawing ratio greater than 2.0) that it must be carried out in two drawing steps, probably with an annealing operation between the steps. In redrawing drawing, two draws are accomplished on the part, one in one direction, the second in the opposite direction (a) true or (b) false 7. In semicentrifugal casting, a tubular mold is used and a tubular part is produced. In true centrifugal casting, the shape is solid; an example is a railway wheel. The mold is rotated so that centrifugal force is used to distribute the molten metal to the exterior of the mold so that the density of the final metal is greater at the outer sections (a) true or (b) falsearrow_forward(a) There are three types of industry, primary, secondary or tertiary. i) ii) Briefly describe each Indicate if each of the following is a primary, secondary or tertiary industry Growing corn Beer production Cake shop Car manufacture Mining tin Production of Baked Beans Estate Agents Metal casting Production of toy dolls (b) Goods can be described as consumer goods or capital goods, briefly describe the difference and provide two example of each. (c) There are four general shaping processes, name and briefly describe how each is performed.arrow_forwardFor the mass production of flat metal sheet shapes; Waterjet cutting is the most appropriate manufacturing solution Stamping is used to obtain the sheet geometry Casting is an optimal solution Laser cutting is the optimal choicearrow_forward
- Which of the following do not pertains to the advantage of using powder metallurgy over casting in fabricating metal products? Allows fabrication for alloys having high melting temperatures. Heat treatment after compaction is unnecessary. Better dimensional tolerances result Porosity may be introduced, the degree of which may be controlledarrow_forwardWhat is the right solution?arrow_forward4. What are the advantages and limitations of using die inserts?arrow_forward
- 1. Die casting is the process where molten metal is force into the die cavity at high pressures. There are two types of die casting; hot camber process and cold chamber process. Please describe and draw the schematic illustration to represent each of them. 2. a) Flat rolling reduces the thickness of plates and sheets. It is possible, instead, to reduce their thickness simply by stretching the material? Would this be a feasible process? Explain. b) Defects may be present on the surfaces of rolled plates and sheets, or there may be internal structural defects. Defects are undesirable not only because they adversely affect surface appearance, but also because they may affect strength, formability, and other manufacturing characteristics of the rolled sheets. Describes the typical defects in flat rolling by providing the schematic illustration for each of them.arrow_forwardwhat is the right answer and solution?arrow_forwardRanking metal shaping processes by kg carbon footprint (per kg of stuff produced) which of the following is the correct ranking (least carbon footprint to most)? Extrusion, Forging, Wire drawing, Casting, Vapour Deposition Methods, Powder Forming Forging, Casting, Extrusion, Powder Forming, Wire drawing, Vapour Deposition Methods Casting, Forging, Extrusion, Wire drawing, Powder Forming, Vapour Deposition Methods Casting, Extrusion, Forging, Wire Drawing, Powder Forming, Vapour Deposition Methodsarrow_forward
- There are several ways of shaping plate or sheet glass. Name and briefly describe one of them.arrow_forwardBriefly describe and illustrate a manufacturing process for each of the following items, mentioning specific manufacturing issues which may arise with each process: 3. (a) Part A of this pasta rolling machine.arrow_forwardPlease show your correct and complete solution neatly. Thanks. ASAP!arrow_forward
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