EBK MANUFACTURING ENGINEERING & TECHNOL
7th Edition
ISBN: 8220100793431
Author: KALPAKJIAN
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
Textbook Question
Chapter 11, Problem 1RQ
Describe the differences between expendable and permanent molds.
Expert Solution & Answer
To determine
Describe the differences between expendable and permanent molds.
Explanation of Solution
Expendable molds | Permanent molds |
1. These comprise ceramics, plaster, sand, and blended with binders to enhance characteristics. | 1. These comprise metals which sustains their strength at higher temperatures. |
2. Once the casting is hardened, it is time to break the mold so as to get rid of the casting. That’s why we call it expendable. | 2. These molds are utilized time and again. That’s why it is called permanent molds. |
Want to see more full solutions like this?
Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!
Students have asked these similar questions
What are patterns for stand castings made of and what material is used to make patterns for shell molds?
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.)
Calculate mould dimension for sprue runner and in-gate, the material using fluorothermoplastic
and using injection molding.
Question:
1. explain the steps for making a mold
2. If possible, use a simulation of the position where the defect will occur
3. Calculate to make mold male and female, the shape is near net shape product and
determine material for dies, the liquid materials is 167°C
Guidelines
Sprue Gate Guidelines
L
50% W1
A1
2-3°
W1
20- 100% of W2
R1
> 1.5 mm
T2
75-100% T1 (part thickness)
D1
125-400% T1 (part thickness)
D1
100-300% T1 (part thickness)
Part Thickness
1.6 mm
R
> 1 mm (0.040")
% Shrinkage Parallel to Flow
4.0-4.5
% Shrinkage Perpendicular to Flow 4.3-4.8
T3
100-200 % (part thickness)
Chapter 11 Solutions
EBK MANUFACTURING ENGINEERING & TECHNOL
Ch. 11 - Describe the differences between expendable and...Ch. 11 - Name the important factors in selecting sand for...Ch. 11 - What are the major types of sand molds? What are...Ch. 11 - List important considerations when selecting...Ch. 11 - What is the function of a core?Ch. 11 - What is the difference between sand-mold and...Ch. 11 - What are composite molds? Why are they used?Ch. 11 - Describe the features of plaster-mold casting.Ch. 11 - Name the type of materials typically used for...Ch. 11 - What are the advantages of pressure casting over...
Ch. 11 - List the advantages and limitations of die...Ch. 11 - What is the purpose of a riser? What is a blind...Ch. 11 - Explain the purpose of a vent and a runner in a...Ch. 11 - How are shell molds produced?Ch. 11 - What keeps the mold together in vacuum casting?Ch. 11 - What is squeeze casting? What are its advantages?Ch. 11 - What are the advantages of the lost-foam casting...Ch. 11 - Prob. 18RQCh. 11 - What are the reasons for the large variety of...Ch. 11 - Why are risers not as useful in die casting as...Ch. 11 - Describe the drawbacks to having a riser that is...Ch. 11 - Why can blind risers be smaller than open-top...Ch. 11 - Why does die casting produce the smallest cast...Ch. 11 - Why is the investment-casting process capable of...Ch. 11 - What differences, if any, would you expect in the...Ch. 11 - Recently, cores for sand casting have been...Ch. 11 - Would you recommend preheating the molds used in...Ch. 11 - Give reasons for, and examples of, using die...Ch. 11 - Referring to Fig. 11.3, do you think it is...Ch. 11 - Explain why squeeze casting produces parts with...Ch. 11 - How are the individual wax patterns attached on a...Ch. 11 - Describe the measures that you would take to...Ch. 11 - You have seen that, even though die casting...Ch. 11 - How are hollow parts with various cavities made by...Ch. 11 - It was stated that the strength-to-weight ratio of...Ch. 11 - How are risers and sprues placed in sand molds?...Ch. 11 - In shell-mold casting, the curing process is...Ch. 11 - Why does the die-casting machine shown in Fig....Ch. 11 - Prob. 39QLPCh. 11 - What are the benefits to heating the mold in...Ch. 11 - The slushy state of alloys refers to that state...Ch. 11 - Can a chaplet also act as a chill? Explain.Ch. 11 - Rank the casting processes described in this...Ch. 11 - Estimate the clamping force for a die-casting...Ch. 11 - In sand casting, it is important that the...Ch. 11 - If an acceleration of 100 g is necessary to...Ch. 11 - A jeweler wishes to produce 24 gold rings in one...Ch. 11 - Describe the procedures that would be involved in...Ch. 11 - The optimum shape of a riser is spherical to...Ch. 11 - Sketch and describe a casting line consisting of...Ch. 11 - Outline the casting processes that would be most...Ch. 11 - Make a list of the mold and die materials used in...Ch. 11 - Write a brief paper on the permeability of molds...Ch. 11 - Light metals commonly are cast in vulcanized...Ch. 11 - It sometimes is desirable to cool metals more...Ch. 11 - The part shown in Fig. P11.59 is a hemispherical...Ch. 11 - Porosity that has developed in the boss of a...Ch. 11 - In Fig. II.1b the gemstones have been cast in...
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
- Explain in detail different components of a gating system in sand mold castingarrow_forward6. Define Expendable-mold, Expendable-pattern Casting Processesarrow_forward5. Name the various additives used in moulding sand and explain how they affect its properties and Differentiate between binding and non-binding additives.arrow_forward
- Highlighting the positive pattern making allowances, explain in detail with a neat sketch and labelling the same, the 2-box molding procedure for the following component considering it as a split pattern. Through Hole (a)arrow_forwardPlease show all of your work; thank youarrow_forwardI am stuck on this question I have for my homework. Can you please help me out?arrow_forward
- Please show all of your work, thanks!arrow_forwardFor the casting of the part whose perspective pictures are given below, take into account the section surface (model design), (core design if necessary), all molding stages and finally (the mold in the most suitable form for casting) and name all mold elements by showing them on the figure (Note: The hole seen in the figure is a full hole.)arrow_forwardBriefly explain the Casting and Molding processes and define their basic requirements. If a manufacturer was asked to produce a set of plastic bottles, which method would you suggest?Justify your answer.arrow_forward
- Casting is a manufacturing process in which a liquid material is usually poured into a mold, which contains a hollow cavity of the desired shape, and then allowed to solidify. You are given a task to fabricate an engine block. In your own words, explain how to fabricate it using any suitable four types of processes which can be used and discuss the benefits of each processesarrow_forwardamswer with respect to solidworks software need it correctlyarrow_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
- Elements Of ElectromagneticsMechanical EngineeringISBN:9780190698614Author:Sadiku, Matthew N. O.Publisher:Oxford University PressMechanics of Materials (10th Edition)Mechanical EngineeringISBN:9780134319650Author:Russell C. HibbelerPublisher:PEARSONThermodynamics: An Engineering ApproachMechanical EngineeringISBN:9781259822674Author:Yunus A. Cengel Dr., Michael A. BolesPublisher:McGraw-Hill Education
- Control Systems EngineeringMechanical EngineeringISBN:9781118170519Author:Norman S. NisePublisher:WILEYMechanics of Materials (MindTap Course List)Mechanical EngineeringISBN:9781337093347Author:Barry J. Goodno, James M. GerePublisher:Cengage LearningEngineering Mechanics: StaticsMechanical EngineeringISBN:9781118807330Author:James L. Meriam, L. G. Kraige, J. N. BoltonPublisher:WILEY
Elements Of Electromagnetics
Mechanical Engineering
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Oxford University Press
Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:9780134319650
Author:Russell C. Hibbeler
Publisher:PEARSON
Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:9781259822674
Author:Yunus A. Cengel Dr., Michael A. Boles
Publisher:McGraw-Hill Education
Control Systems Engineering
Mechanical Engineering
ISBN:9781118170519
Author:Norman S. Nise
Publisher:WILEY
Mechanics of Materials (MindTap Course List)
Mechanical Engineering
ISBN:9781337093347
Author:Barry J. Goodno, James M. Gere
Publisher:Cengage Learning
Engineering Mechanics: Statics
Mechanical Engineering
ISBN:9781118807330
Author:James L. Meriam, L. G. Kraige, J. N. Bolton
Publisher:WILEY
composite-materials; Author: Tonya Coffey;https://www.youtube.com/watch?v=Vu6ik-bcKf4;License: Standard youtube license