16. Озаглавьте текст в одним английским словом.

17. Ответьте по-английски на следующие вопросы

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?

18. Прочтите и переведите на русский язык текст с 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. Укажите номера предложений, которые не соответствуют содержанию текста С

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.

20. Просмотрите еще раз текст С и ответьте по-английски кратко на следующие вопросы (положительно или отрицательно)

1) Is it necessary to use the parting sand?

2) Is it always necessary to form vent holes?

3) Is it necessary to ram the mold properly?

4) Is it necessary to make all gates on top of the mold?

5) Is it necessary to use a riser?

6) Is it necessary to remove it then?

21. Ответьте на следующие вопросы одним английским термином

1) How is the surface between cope and drag called?

2) What sand is applied over this surface?

3) What is made in the mold for the escape of steam and gases?

4) What opening is formed on the top of the cope through which the molten metal must be poured?

5) What is formed in the mold to compensate for the liquid shrinkage of metal?

22. Придумайте заголовок к тексту С и перескажите по-английски содержание данного текста.

23. Расположите английские термины в последовательности, соответствующей последовательности поступления металла в полость формы

gate, gate sprue, pouring basin, runner.

24. Подберите к следующим русским терминам английские эквиваленты, данные под чертой

a) воздух, пар, газ__

gas, air, steam

b) соединять, соединение, соединительная поверхность

joint, to join, joining

c) литниковая воронка, вертикальный литник (стояк), горизонтальный литник, питатель_______________________________________________________

gate, gate sprue, pouring basin, runner

d) часть, поверхность, поверхность разъема

surface, part, parting surface.