Transform the following sentences a) into Second Conditional, b) into Third Conditional. The first one has been done for you.

1. If the first step in metal casting involves the creation of a mold, the molten metal will be poured and cooled.

a) If the first step in metal casting involved the creation of a mold, the molten metal would be poured and cooled.

b) If the first step in metal casting had involved the creation of a mold, the molten metal would have been poured and cooled.

2. If sand is the most common molding material, it will be used in foundry processes.

3. If green sand molds are used in 85% of foundries, these molds will be the most important for us.

4. If the sand provides the structure for the mold, it will be used in foundry processes.

5. The carbonaceous materials will be used in foundry processes, if they prevent rust.

6. If the water is used to activate the clay it will be useful for this research.

7. If sand molds are used only once, they won’t be rather useful.

8. If most of the sand from green sand molds is reused, future molds will be made from this sand.

9. If cores are strong and hard to withstand the molten metal, they will be removed after the metal piece cooled.

10. If shell molds use chemically bonded sand, they will be used in our industry.

8. Answer the following questions:

1. What is done to remove the mold?

2. How is solid waste created?

3. How is the metal piece cleaned?

4. What can be remained on the metal piece?

5. Where can surface coating be applied?

6. What does the first step of metal casting involve?

7. What is the most common molding material?

8. What are the components of green sand?

9. What bind the sand together in the mold?

10. What types of molds do you know?

Дата добавления: 2015-07-25