2015-02-04
4537
1. Запишите новые слова и составьте с ними свои предложения.
shape - форма
casting - отливка
rolling - прокат
welding - сварка
piercing - прохождение
trimming - обрезка (заделка отверстия краев)
spinning - выдавливание (на токарно-давильном станке)
drawing - черчение; зд. вытягивание
chuck - зажим; патрон, держатель
carriage - каретка
milling - фрезерование
surface - поверхность
grinding - дробление (измельчение), шлифовка
convenient - удобный
to equip - снаряжать, оборудовать
shaping - придание формы
thread - резьба; нарезка
bending – сгибание
headstock - передняя бабка
tailstock - задняя бабка
lathe - токарный станок
drilling – сверление
cutting – резание
high-speed – скоростной
efficient – эффективный
forging – ковка
boring - бурение, сверление
steel - сталь
2. Прочтите тексты
MACHINE-TOOLS
Metal undergoes a number of processes before it is formed into the required shape: casting, rolling, welding, piercing, trimming, spinning, bending, drawing, etc.
The machines which perform all these kinds of works are called machine-tools. The most common machine-tool found in almost any workshop is the lathe. The main parts of it are: the headstock, the chuck, the tailstock, the carriage.
The automatic lathe is a perfection of the ordinary lathe. Its tools are changed automatically. A worker skilled in the use of a lathe is called a turner.
|
|
|
There are many other machine-tools that work on plane surfaces, for example, milling machines, planning and shaping machines. Circular holes are drilled by a drilling machine or bored by a boring machine or a boring mill. Thread milling machines are used in the production of different machine elements. Gear cutting machines include gear milling machines. All these machines use cutting tools made of high-speed steel.
LATHES
There are three types of lathes produced by our machine-tool manufacturing works: heavy, medium and light types. The type of a lathe depends upon the size of diameter of work pieces.
A most convenient and efficient machine is the model combination lathe for turning, milling, drilling, grinding, slotting, and tool-sharpening jobs. It can be used both in stationary and mobile repair shops, on ships, etc.
