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 15, Problem 1RQ
What are some of the major disadvantages of the expendable-mold casting processes?
Expert Solution & Answer
To determine
The major disadvantages of the expendable mold casting process.
Explanation of Solution
The expendable mold casting process includes sand, plastic, shell, plaster, and investment (lost-wax technique) moldings. Expendable mold castings processes have are temporary and non-usable molds.
Major disadvantages of expendable mold casting processes are written below:
- High melting points materials are difficult to cast by using this process.
- A new mold has to be made for each pour. Due to which there can be variation in dimensional accuracy, strength, moisture content, and pattern removal. Also, theproduction rate can be slow.
- It requires highly skilled labor since the casting process is too complex.
- Grey cast iron gives a negative allowance, which can break the pattern during the expendable-mold casting process.
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Two large tanks, each holding 100 L of liquid, are interconnected by pipes, with the liquid flowing from tank
A into tank B at a rate of 3 L/min and from B into A at a rate of 1 L/min (see Figure Q1). The liquid inside each
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6 L/min. The diluted solution flows out of the system from tank A at 4 L/min and from tank B at 2 L/min. If,
initially, tank A contains pure water and tank B contains 20 kg of salt.
A
6 L/min
0.2 kg/L
x(t)
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4 L/min
x(0) = 0 kg
3 L/min
1 L/min
B
y(t)
100 L
y(0) = 20 kg
2 L/min
Figure Q1 - Mixing problem for interconnected tanks
Determine the mass of salt in each tank at time t≥ 0:
Analytically (hand calculations)
Using MATLAB Numerical Functions (ode45)
Creating Simulink Model
Plot all solutions on the same graph for the first 15 min. The graph must be fully formatted by code.
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Chapter 15 Solutions
Degarmo's Materials And Processes In Manufacturing
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