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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Chapter 13, Problem 46RQ
What are the three stages of contraction or shrinkage as a liquid is converted into a finished casting?
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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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- (9,00 Puanlar) A riser in the shape of a sphere is to be designed for a sand casting mold. The casting is a rectangular plate, with 8- length 50 cm, width = 35 cm, and thickness = 4 cm. If the total solidification time of the casting itself is known to be 7,5 min, determine the diameter of the riser so that it will take 30% longer for the riser to solidify. %3D Riser volume: V3(TD3)/6(D%3Ddiameter) Riser area: A=TD2 Casting volume: V-L-Wt (L-Length, W=width, t-thickness) a) 8,41 cm b) O 7,34 cm c) 6.62 cm 11,46 cm Boş bırak KÖnceki 8/43 Sonraki> Каpatarrow_forward4) List the passageway (gating system) elements in sand casting moulds and show them with drawing? Draw the stress-strain curve and gives the stress and strain equations for both Engineering and True stress-strainarrow_forward(9,00 Puanlar) 36 - A riser in the shape of a sphere is to be designed for a sand casting mold. The casting is a rectangular plate, with length = 25 cm, width = 15 cm, and thickness = 2,5 cm. If the total solidification time of the casting itself is known to be 4,5 min, determine the diameter of the riser so that it will take 2596 longer for the riser to solidify. Riser volume: V-(nD³/6 (D=diameter) Riser area: A-TD2 Casting volume: V-L-W-t (L-Length, W=width, t=thickness)arrow_forward
- where are the die cores placed in die casting?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_forwardA 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_forward
- identify some of the important advantages of shape-casting processarrow_forwardA 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.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_forward
- what effects does casting have on material propertiesarrow_forwardQUESTION 1 a) Explain what is the basic difference between expendable and permanent molds used in metal casting? Briefly also describe what are the primary advantage and disadvantage of each these two types of molds? (CO1, PO1, C2) b) Describe the steps involved in making the sand mold and the casting, including what steps that may be needed to improve the casting after it is hardened and removed? (C01, PO1, C2) c) One of Open Mold processes for shaping fibre reinforced plastics (FRP) is Hand Lay Up. List the five (5) steps involved in the Hand Lay Up method? (CO2, PO1, C2`arrow_forwardProblem 1 Suppose we want to cast a magnesium bar 20x20x45 mm³. We are to use a mid gating (exactly at the parting line) system with two runners and multiple ingates (no bends in runner), a top riser of 1:1.2 (D:H) ratio, and the bar lying down. The pouring cup to be used has a height of 10 mm. What would be the riser dimensions for this casting? Use the JB Caine Method (a, b, c = 0.10, 0.06, 1.08). If the choke area is 20 mm?, how long would the pouring time be?arrow_forward
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Casting Metal: the Basics; Author: Casting the Future;https://www.youtube.com/watch?v=2CIcvB72dmk;License: Standard youtube license