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КАТЕГОРИИ:






Complete the following sentences




 

1) Sand molds are made in a box called a ….

2) The molding sand is packed into the flask around the ….

3) The flask consists of cope and ….

4) Patterns may be made of wax, metal or ….

5) Patterns must be of the same shape as the ….

6) There are two kinds of patterns: solid and ….

7) The drag and one half of the split pattern are placed on the special board called ….

 

Retell Text A using these questions as a plan.

 

1) Where is the sand packed in the molding?

2) What is used to form the mold cavity?

3) What kinds of pattern are these?

4) What materials may be used for producing patterns?

5) Are wooden or metal patterns more economical?

6) What patterns, wooden or metal, may be used longer?

7) What parts does a flask consist of?

8) What boards are used in sand molding?

 

14. What part of speech are the underlined words? Translate the following sentences.

 

1) The place where molds are poured is called the pouring station.

2) We must place the pattern on the mould board.

3) The bottom board is placed on top of the packed lower half of the mold.

4) When we turn the flask over, the lower part of it becomes the top of the mold.

5) The top part of the flask is called the cope, the bottom part - the drag.

 

Read Text B and define what its main idea.

 

Text B

To form a hole (отверстие) or hollow in the casting a core is placed in the mold cavity. Cores are formed of sand in core boxes, which are metal or wooden boxes. After removing the core from the box, it is dried (сушить) in a special oven (печь). The core is placed into the mold after the pattern had been removed. The molten metal flows around the core and forms the hole in the casting.

 






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