Degarmo's Materials And Processes In Manufacturing
13th Edition
ISBN: 9781119492825
Author: Black, J. Temple, Kohser, Ronald A., Author.
Publisher: Wiley,
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Textbook Question
Chapter 13, Problem 19RQ
Nucleation generally begins at preferred sites within a mold. What are some probable sites for nucleation?
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Chapter 13 Solutions
Degarmo's Materials And Processes In Manufacturing
Ch. 13 - What are the six activities that are conducted on...Ch. 13 - What is materials processing?Ch. 13 - What are the five basic families of...Ch. 13 - Describe the capabilities of the casting process...Ch. 13 - What are some of the various mold materials and...Ch. 13 - How might the desired production quantity...Ch. 13 - Why is it important to provide a means of venting...Ch. 13 - What types of problem or defect can occur if the...Ch. 13 - Why might product removal be less of a problem...Ch. 13 - What is a casting pattern? Flask? Core? Mold...
Ch. 13 - In a horizontally parted two-part mold, what is...Ch. 13 - What are some of the components that combine to...Ch. 13 - What is a parting line or parting surface?Ch. 13 - What is draft, and why is it used?Ch. 13 - Why is it important to control the solidification...Ch. 13 - What are the two stages of solidification, and...Ch. 13 - Why is it that most solidification does not begin...Ch. 13 - Why might it be desirable to promote nucleation in...Ch. 13 - Nucleation generally begins at preferred sites...Ch. 13 - Why might directional solidification be desirable...Ch. 13 - Describe some of the key features observed in the...Ch. 13 - What is superheat?Ch. 13 - Prob. 23RQCh. 13 - What is a liquidus temperature? A solidus...Ch. 13 - What is the freezing range for a metal or alloy?Ch. 13 - Discuss the roles of casting volume and surface...Ch. 13 - What characteristics of a specific casting process...Ch. 13 - What is the correlation between cooling rate and...Ch. 13 - What is the chill zone of a casting, and why does...Ch. 13 - Which of the three regions of a cast structure is...Ch. 13 - What is dross or slag, and how can it be prevented...Ch. 13 - What are some of the possible approaches that can...Ch. 13 - What is a misrun or cold shut, and what causes...Ch. 13 - What is fluidity, and how can it be measured?Ch. 13 - What is the most important factor controlling the...Ch. 13 - What defect can form in sand castings if the...Ch. 13 - Why is it important to design the geometry of the...Ch. 13 - Why might it be preferable to attach gates to the...Ch. 13 - Prob. 39RQCh. 13 - What are some desirable features in the sprue...Ch. 13 - What is a choke, and how does its placement affect...Ch. 13 - What features can be incorporated into the gating...Ch. 13 - What are some of the materials and designs of...Ch. 13 - What factors might influence the positioning of...Ch. 13 - What features of the metal being cast tend to...Ch. 13 - What are the three stages of contraction or...Ch. 13 - Why is it more difficult to prevent shrinkage...Ch. 13 - What steps can be taken to compensate for the...Ch. 13 - During what stage of shrinkage might hot tears...Ch. 13 - What is the role of a riser?Ch. 13 - Why is it desirable to design a casting to have...Ch. 13 - What is yield, and how does it relate to the...Ch. 13 - Based on Chvorinovs rule, what would be an ideal...Ch. 13 - Define the following riser-related terms: top...Ch. 13 - What assumptions were made when using Chvorinovs...Ch. 13 - Discuss aspects relating to the connection between...Ch. 13 - What is the purpose of a chill? Of an insulating...Ch. 13 - What are some materials that are commonly used to...Ch. 13 - What types of modifications or allowances are...Ch. 13 - Prob. 60RQCh. 13 - What is the purpose of a draft or taper on pattern...Ch. 13 - Why is it desirable to make the pattern allowances...Ch. 13 - What additional adjustment or correction must be...Ch. 13 - What are some of the features of the casting...Ch. 13 - Prob. 65RQCh. 13 - What are some design recommendations for inside...Ch. 13 - What are some appearance considerations in parting...Ch. 13 - Prob. 68RQCh. 13 - Prob. 69RQCh. 13 - Using Chvorinovs rule as presented in the text...Ch. 13 - Reposition the riser in Problem 1 so that it sits...Ch. 13 - A rectangular casting having the dimensions 3 in....Ch. 13 - A cylinder with a diameter of 2.5 in. and a height...Ch. 13 - Figure 13.Ashows the wall profile of a cast iron...Ch. 13 - Investigate various experimental techniques to...Ch. 13 - Porosity within a casting can be either...Ch. 13 - The chapter text describes various materials that...Ch. 13 - What is the most likely source of the gas bubbles?...Ch. 13 - What factors may have caused the penetration...Ch. 13 - Prob. 3CSCh. 13 - Prob. 4CSCh. 13 - Prob. 5CS
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- When 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_forwardWhat would you do to improve the surface finish in expendable-mold casting processes?arrow_forwardHow can density effect in sand casting operation and how we can plan an experiment to see the effect ?arrow_forward
- Explain the function of a riser in sand mold casting process. Please sen me answer in detail in typing formarrow_forward11)Q2. Identify the casting process in which the molten metal is injected in mold/die at high pressure and explain its working principle along with a neat diagram.arrow_forwardQ#3:(a)Explain the function of a riser in sand mold casting process.arrow_forward
- For pouring the part, whose perspective pictures are given below, into sand mold,model design, core design if necessary, all molding steps andFinally, draw the mold in the best way to pour and shape all the mold elements.Name it by pointing on it (Note: The hole shown in the figure is a through hole.)arrow_forwardDescribe the die casting process in detail. Use neat sketches for clarity. Differentiate clearly between hot-chamber die casting and cold-chamber die casting processes. What is the difference between true centrifugal and semi-centrifugal casting? Describe the centrifugal casting process in detail. Use neat sketches to elaborate your description.arrow_forward
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