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КАТЕГОРИИ:






Find a suitable title for Text B. Use only one word.




 

Answer the following questions.

 

a) What is the purpose of using cores?

b) Where are the cores produced?

c) Where are the cores dried?

d) What material is used for making cores?

 

Rad and translate Text C.

 

Text C

When two halves of the sand mold have been packed with the molding sand, the cope is placed on the drag. The surface where the cope and the drag meet is called a parting surface, or joint. Parting sand is applied to this surface in order that the mold halves could not stick when they are disjoined for removing the pattern. Sometimes a number of vent holes may be formed in a mold to help the escape of the steam and gases produced during pouring. However, this is usually not required because a sand mold properly rammed will allow these gases to escape.

Molten metal is poured into the mold through the pouring basin. From there it flows downward through the gate sprue to a runner at the parting surface, then into the mold cavity through the gate or gates. A riser is used to supply molten metal which will compensate for the metal shrinkage during solidification of the casting. Gates and risers are removed from the castings in the cleaning department and later remelted.

 

19. Are these sentences true or false?

 

1) After placing the cope on the drag they are packed with sand.

2) The two halves of the mold must be disjoined for removing the pattern.

3) The gating system consists of several parts.

d) The shrinkage of the liquid metal in the mold cavity may be compensated through the use of the riser.

4) Vent holes must be always made in the mold for the escape of steam.

 






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