Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 10, Problem 8RQ
What is the function of chills? What are they made of?
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
What is the hardening process? What is rooting?
Why the chills are used in moulds in casting?
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 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...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- q#8. Explain in detail different components of a gating system in sand mold casting..arrow_forwardExplain the working of principles of the die casting process which is most preferred of the high production rate?arrow_forwardContinuous Cooling Transformation (CCT) Diagram for Steel 1. If a sample of austenite is cooled from 760°C to room temperature at a rate of 85°C/s (midway between the red and blue dotted lines), estimate the following values: a) How much time would it take for pearlite to begin forming and at what temperature would this occur? b) How much time would it take for martensite to begin forming and at what temperature would this occur? Temperature (°C) 800 Eutectoid temperature 1400 700 Pearlite 600 500 400 300 Critical cooling rate 200 140°C/s Austenite 35°C/s 1200 1000 800 600 M (start) 400 100 Martensite Martensite I + ++ Pearlite 200 Pearlite 0 10-1 1 10 102 103 104 105 Time (s) Temperature (°F)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_forwardDiscuss when might low quantities be justified for the die-casting process?arrow_forwardwhere are the die cores placed in die casting?arrow_forward
- 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.arrow_forwardState 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.arrow_forward1-In hot forming processes, the strain rate is important since deformation resistance of w.p. increases as is increased. ****** 2-The coating of interior surfaces of casting molds can aid....... 3- Based on nature of use, the cores can be classified into: 1. and 2. ..... and 4-In centrifugal casting, fine grain microstructure (resisting to corrosion, better mechanical properties) castings can be obtained because of...... 5-During manufacturing processes, the residual stresses can be arising due to three major reasons: 1......, 2...... and 3...... 6- The wheels, pulleys and flywheels can be manufacturing by...... casting. 7- The ...... of casting molds can help removing impurities and facilitating metal flow inside the molds. 8-In horizontal true centrifugal casting, a tubular products having uniform wall thickness can be obtained when...... is greater than ......arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Welding: Principles and Applications (MindTap Cou...Mechanical EngineeringISBN:9781305494695Author:Larry JeffusPublisher:Cengage Learning
Welding: Principles and Applications (MindTap Cou...
Mechanical Engineering
ISBN:9781305494695
Author:Larry Jeffus
Publisher:Cengage Learning
What is entropy? - Jeff Phillips; Author: TED-Ed;https://www.youtube.com/watch?v=YM-uykVfq_E;License: Standard youtube license