Е. С. Закирова, П. А. Красавин Английский язык для технических вузов

Exercise 20. Listen to the text “Different Kinds of Casting”

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SPEAKING Exercise 21. Share your vision of engineering materials technology using the following phrases: to my mind, in my opinion, if I am not mistaken, as far as

Exercise 20. Listen to the text “Different Kinds of Casting”.
Before listening: mind the words and phrases given to comprehend better the
information you are going to listen to.
Sand casting — литье в песчаные формы;
sufficiently refractory — достаточно огнеупорный;
shell-mold casting — литье в оболочковые формы;
resin covered sand — песок, пропитанный клеем;
dimensional accuracy — точные габаритные размеры;
die casting — литье в постоянные формы;
spin casting — центробежное литье;
to spin — вращаться.
After listening: agree or disagree with the following statements and add some
more information if needed.
1. There are some pouring methods such as gravity, vacuum or pressure
methods. 2. Molds can be made from sand or metal. 3. Sand casting has bet-
ter dimensional accuracy as compared to shell-mold casting. 4. The mold for
shell-mold casting is created using two hardened tool steel dies. 5. The casting
material for spin casting is molten metal or liquid thermoset plastic.
SPEAKING
Exercise 21. Share your vision of engineering materials technology using the
following phrases: to my mind, in my opinion, if I am not mistaken, as far as
I remember, it seems to me, etc.
1. Forming, cutting, joining processes are categorized as modern metal-
working processes, aren’t they?
2. What are the main metalworking forming processes?
3. Casting is the main manufacturing process, isn’t it?
4. Is casting more often used in metalworking than forging?
5. What kinds of casting do you know?
6. What is the most common kind of casting? Why?
7. Why is a forging stronger than an equivalent casting?
8. Can forging processes be performed at various temperatures?
9. What kinds of forging operations are available?
10. Most forging operations use metal-forming dies, don’t they?
11. What kinds of dies does open die forging use?
12. How is flash formed during impression die forging?

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13. What are the advantages and disadvantages of true closed die forging?
14. What sheet metal forming processes can you name?
15. What is sintering? Can you describe it?

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