To look for a new job (work, position) — искать новую работу
to apply for a new job — претендовать на какую-либо должность
application for a position of — заявление на какую-либо должность
resume — резюме
C.V. (curriculum vitae) — автобиография
to be fired — быть уволенным
to retire — уходить на пенсию
to be unemployed — быть безработным
«THE FUTURE OF THE ENGINEERING PROFESSION»
Among various recent trends in the engineering profession computerization is the most widespread. The trend in modern engineering offices is also towards computerization. Computers are increasingly used for solving complex problems as well as for handling, storing, and generating the enormous volume of data modern engineers must work with.
Scientific methods of engineering are applied in several fields not connected directly to manufacture and construction. Modern engineering is characterized by the broad application of what is known as systems engineering principles.
Engineers in industry work not only with machines but also with people, to determine, for example, how machines can be operated most efficiently by workers. A small change in the location of the controls of a machine or of its position with relation to other machines or equipment, or a change in the muscular movements of the operator, often results in greatly increased production. This type of engineering work is called time-study engineering.
A related field of engineering, human-factors engineering, also known as ergonomics, received wide attention in the late 1970s and 1980s when the safety of nuclear reactors was questioned following serious accidents that were caused by operator errors, design failures, and malfunctioning equipment.
Human-factors engineering seeks to establish criteria for the efficient, human-centred design of, among other things, the large, complicated control panels that monitor and govern nuclear reactor operations.
General understanding:
1. What is the most widespread trend in the engineering profession?
2. What are computers used for in modern engineering?
3. What approaches are used in modern engineering?
4. What is «ergonomics»?
5. What does human-factors engineering deal with?
«METALS»
Metals are materials most widely used in industry because of their properties. The study of the production andproperties of metals is known asmetallurgy.
Theseparation between the atoms in metals is small, so most metals aredense. The atoms arearranged regularly and canslide over each other. That is why metals aremalleable (can be deformed andbent withoutfracture) andductile (can bedrawn intowire). Metals vary greatly in their properties. For example,lead is soft and can be bent by hand, whileiron can only be worked by hammering at red heat.
The regular arrangement of atoms in metals gives them a crystalline structure. Irregular crystals are called grains. The properties of the metalsdepend on thesize, shape, orientation, andcomposition of these grains. In general, a metal with small grains will be harder and stronger than one withcoarse grains.
Heattreatment such asquenching, tempering, or annealing controls the nature of the grains and their size in the metal. Small amounts of other metals (less than 1 per cent) are often added to a pure metal. This is called alloying (легирование) and it changes the grain structure and properties of metals.
All metals can be formed by drawing,rolling, hammering andextrusion, but some require hot-working. Metals are subject to metalfatigue and tocreep (the slow increase in length understress) causing deformation and failure. Both effects are taken into account by engineers when designing, for example, airplanes, gas-turbines, and pressure vessels for high-temperature chemical processes. Metals can be worked using machine-tools such as lathe, milling machine, shaper andgrinder.
The ways of working a metal depend on its properties. Many metals can bemelted andcast in moulds, but special conditions are required for metals that react with air.
Vocabulary:
property — свойство
metallurgy — металлургия
separation — разделение, отстояние
dense — плотный
arrangement — расположение
regularly — регулярно, правильно
to slide — скользить
malleable — ковкий, податливый, способный деформироваться
bent pp ofbend — гнуть
to fracture — ломать
ductile — эластичный, ковкий
to draw — волочить, тянуть
wire — проволока
lead — свинец
iron — железо, чугун
grain — зерно
to depend — зависеть
size — размер, величина
shape — форма, формировать
composition — состав
coarse — грубый, крупный
treatment — обработка
quenching — закалка
tempering — отпуск после закалки, нормализация
annealing — отжиг, отпуск
rolling — прокатка
to hammer — ковать (напр. молотом)
extrusion — экструзия
metal fatigue — усталость металла
creep — ползучесть
stress — давление,
failure — повреждение, разрушение
vessel — сосуд, котел, судно
lathe — токарный станок
milling machine — фрезерный станок
shaper — строгальный станок
grinder — шлифовальный станок
to melt — плавить, плавиться расплавить
to cast — отливать, отлить
mould — форма (для отливки)
General understanding:
1. What are metals and what do we call metallurgy?
2. Why are most metals dense?
3. Why are metals malleable?
4. What is malleability?
5. What are grains?
6. What is alloying?
7. What is crystalline structure?
8. What do the properties of metals depend on?
9. What changes the size of grains in metals?
10. What are the main processes of metal forming?
11. How are metals worked?
12. What is creeping?
Find the following words and word combinations in the text:
1. Свойства металлов
2. расстояние между атомами
3. правильное расположение
4. сильно отличаются по своим свойствам
5. кристаллическая структура
6. размер зерен
7. форма зерен
8. закалка
9. отжиг
10.волочение
11.прокатка
12.ковка
13.экструзия
14. структура и свойства зерна
15. горячая обработка
16. усталость металла
17. ползучесть металла
18. плавка и отливка в формы
19. способы обработки металлов
«STEEL»
The most important metal in industry is iron and its alloy — steel. Steel is an alloy of iron and carbon. It is strong and stiff, but corrodes easily through rusting, although stainless and other special steels resist corrosion. The amount of carbon in a steel influences its properties considerably. Steels of low carbon content (mild steels) are quite ductile and are used in the manufacture of sheet iron, wire, and pipes. Medium-carbon steels containing from 0.2 to 0.4 per cent carbon are tougher and stronger and are used as structural steels. Both mild and medium-carbon steels are suitable for forging and welding. High-carbon steels contain from 0.4 to 1.5 per cent carbon, are hard and brittle and are used in cutting tools, surgical instruments, razor blades and springs. Tool steel, also called silver steel, contains about 1 per cent carbon and is strengthened and toughened by quenching and tempering.
Theinclusion of other elementsaffects the properties of the steel.Manganese gives extra strength and toughness. Steel containing 4 per centsilicon is used for transformercores or electromagnets because it has large grains acting like small magnets. The addition of chromium gives extra strength and corrosion resistance, so we can getrust-proof steels. Heating in the presence of carbonor nitrogen-rich materials is used to form a hard surface on steel (case-hardening). High-speed steels, which are extremely important in machine-tools, contain chromium andtungsten plus smaller amounts of vanadium, molybdenum and other metals.
Vocabulary:
alloy — сплав
carbon— углерод
stiff — жесткий
to corrode — разъедать, ржаветь
rusty — ржавый
stainless — нержавеющий
to resist — сопротивляться
considerably — значительно, гораздо
tough — крепкий, жесткий, прочный, выносливый
forging — ковка
welding — сварка
brittle — хрупкий, ломкий
cutting tools — режущие инструменты
surgical instruments — хирургические инструменты
blade — лезвие
spring — пружина
inclusion — включение
to affect — влиять
manganese — марганец
silicon — кремний
rust-proof — нержавеющий
nitrogen — азот
tungsten — вольфрам
General understanding:
1. What is steel?
2. What are the main properties of steel?
3. What are the drawbacks of steel?
4. What kinds of steel do you know? Where are they used?
5. What gives the addition of manganese, silicon and chromium to steel?
6. What can be made of mild steels (medium-carbon steels, high-carbon steels)?
7. What kind of steels can be forged and welded?
8. How can we get rust-proof (stainless) steel?
9. What is used to form a hard surface on steel?
10. What are high-speed steels alloyed with?
Find the following words and word combinations in the text:
1. сплав железа и углерода
2. прочный и жесткий
3. легко коррозирует
4. нержавеющая сталь
5. низкое содержание углерода
6. ковкость
7. листовое железо, проволока, трубы
8. конструкционные стали
9. пригодны для ковки и сварки
10. твердый и хрупкий
11. режущие инструменты
12. хирургические инструменты
13. инструментальная сталь
14.упрочнять
«METHODS OF STEEL HEAT TREATMENT»
Quenching is a heat treatment when metal at a high temperature is rapidly cooled byimmersion in water or oil. Quenching makes steel harder and more brittle, with small grains structure.
Tempering is a heat treatmentapplied to steel and certain alloys. Hardened steel after quenching from a high temperature is too hard and brittle for many applications and is also brittle. Tempering, that is re-heating to anintermediate temperature and cooling slowly, reduces this hardness and brittleness. Tempering temperatures depend on the composition of the steel but are frequently between 100 and 650 °C. Higher temperatures usually give a softer, tougher product. The color of the oxide film produced on the surface of the heated metal often serves as the indicator of its temperature.
Annealing isa heat treatment in which a material at high temperature is cooled slowly. After cooling the metal again becomes malleable and ductile (capable of being bent many times withoutcracking).
All these methods of steel heat treatment are used to obtain steels with certain mechanical properties for certain needs.
Vocabulary:
to immerse— погружать
to apply — применять
intermediate — промежуточный
oxide film — оксидная пленка
annealing — отжиг, отпуск
cracking — растрескивание
General understanding:
1. What can be done to obtain harder steel?
2. What makes steel more soft and tough?
3. What makes steel more malleable and ductile?
4. What can serve as the indicator of metal temperature while heating it?
5. What temperature range is used for tempering?
6. What are the methods of steel heat treatment used for?
Translate into English the following words and word combinations:
1. температура нормализации
2. мелкозернистая структура
3. быстрое охлаждение
4. закаленная сталь
5. состав стали
6. окисная пленка
7. индикатор температуры
8. медленное охлаждении
«MECHANICAL PROPERTIES Of MATERIALS»
Materials Science and Technology is the study of materials and how they can be fabricatedto meet the needsof modern technology. Using the laboratorytechniquesand knowledge of physics, chemistry, and metallurgy, scientists are finding new ways of using metals, plastics and other materials.
Engineers must know how materialsrespond to external forces, such astension, compression, torsion, bending, and shear. All materials respond to these forces by elastic deformation. That is, the materials return their original size and form when theexternal force disappears. The materials may also havepermanent deformation or they mayfracture. The results of external forces arecreep andfatigue.
Compression isa pressure causing adecrease in volume. When a material is subjected to abending, shearing, or torsion (twisting) force, both tensile and compressive forces aresimultaneously at work. When a metal bar is bent, one side of it is stretched and subjected to a tensional force, and the other side is compressed.
Tension is a pulling force; for example, the force in a cable holding a weight. Under tension, a material usuallystretches, returning to its original length if the force does notexceed the material'selastic limit. Under larger tensions, the material does not returncompletely to its original condition, and under greater forces the materialruptures.
Fatigue is the growth of cracks under stress. It occurs when a mechanical part is subjected to a repeated or cyclic stress, such as vibration. Even when the maximum stress never exceeds the elastic limit, failure of the material can occur even after a short time. No deformation is seen during fatigue, but small localized cracks develop and propagate through the material until the remaining cross-sectional area cannot support the maximum stress of the cyclic force. Knowledge of tensile stress, elastic limits, and the resistance of materials to creep and fatigue are of basic importance in engineering.
Creep is a slow, permanent deformation that results from a steady force acting on a material. Materials at high temperatures usually suffer from this deformation. The gradualloosening of bolts and the deformation of components of machines and engines are all the examples of creep. In many cases the slow deformation stops because deformationeliminates the force causing the creep. Creepextended over a long time finally leads to the rupture of the material.
Vocabulary
bar— брусок, прут
completely — полностью, совершенно
compression — сжатие
creep — ползучесть
cross-sectional area — площадь поперечного сечения
cyclic stress — циклическое напряжение
decrease — уменьшение
elastic deformation — упругая деформация
elastic limit — предел упругости
exceed — превышать
external forces — внешние силы
fatigue — усталость металла
fracture — перелом, излом
loosen — ослаблять, расшатывать
permanent deformation — постоянная деформация
remaining — оставшийся
shear — срез
simultaneously — одновременно
to stretch — растягивать
technique — методы
tension — напряженность
to propagate — распространяться
to bend — гнуть, согнуть
to extend — расширять, продолжаться
to meet the needs — отвечать требованиям
to occur — происходить
to respond — отвечать реагировать
to suffer — страдать
torsion — кручение
twisting — закручивание, изгиб
volume — объем, количество
rupture — разрыв
General understanding:
1. What are the external forces causing the elastic deformation of materials? Describe those forces that change the form and size of materials.
2. What are the results of external forces?
3. What kinds of deformation are the combinations of tension and compression?
4. What is the result of tension? What happens if the elastic limit of material is exceeded under tension?
5. What do we call fatigue? When does it occur? What are the results of fatigue?
6. What do we call creep? When does this type of permanent deformation take place? What are the results of creep?
Find the following in the text:
1. отвечать требованиям современной технологии
2. используя лабораторные методы
3. новые способы использования металлов
4. сжатие, растяжение, изгиб, кручение, срез
5. возвращать первоначальный размер и форму
6. внешняя сила
7. постоянная деформация
8. уменьшение объема
9. растягивающие и сжимающие силы
10. превышать предел упругости материала
11. повторяющиеся циклические напряжения
12. разрушение материала
13. развитие и распространение мелких трещин
14. сопротивление материалов ползучести и усталости
«MACHINE-TOOIS»
Machine-tools are used toshape metals and other materials. The material to be shaped is called theworkpiece.Most machine-tools are nowelectrically driven. Machine-tools with electrical drive are faster and moreaccurate than hand tools: they were an important element in thedevelopment of mass-production processes, as they allowed individual parts to be made in large numbers so as to beinterchangeable.
All machine-tools havefacilities for holding both the workpiece and the tool, and for accurately controlling the movement of the cutting toolrelative to the workpiece. Most machining operations generate largeamounts of heat, and use coolingfluids (usually a mixture of water and oils) for cooling andlubrication.
Machine-tools usually work materials mechanically but other machining methods have been developed lately. They include chemical machining,spark erosionto machine very hard materials to any shape by means of a continuous high-voltagespark (discharge) between an electrode and a workpiece. Other machining methods includedrilling using ultrasound, and cuttingby means of a laserbeam. Numerical control of machine-tools andflexible manufacturing systems have made it possible for complete systems of machine-tools to be used flexibly for the manufacture of arange of products.
Vocabulary:
machine-tools — станки
electrically driven — с электроприводом
shape — форма
workpiece — деталь
accurate — точный
development — развитие
to allow — позволять, разрешать
interchangeable — взаимозаменяемый
facility — приспособление
relative —относительный
amount — количество
fluid — жидкость
to lubricate — смазывать
spark erosion — электроискровая обработка
discharge — разряд
by means of — посредством
beam — луч
drilling — сверление
flexible — гибкий
range — ассортимент, диапазон
«LATHE»
Lathe is still the most important machine-tool. It produces parts ofcircular cross-section by turning the workpiece on its axis and cutting itssurface with a sharp stationary tool. The tool may be movedsideways to produce a cylindrical part and moved towards the workpiece to control thedepth of cut. Nowadays all lathes are power-driven by electric motors. That allows continuous rotation of the workpiece at a variety of speeds. The modern lathe is driven by means ofa headstock supporting a hollowspindle on accurate bearings and carrying either achuck or a faceplate, to which the workpiece is clamped. The movement of the tool, both along thelathe bed and at right angle to it, can be accurately controlled, soenabling a part to be machined to closetolerances. Modern lathes are often under numerical control.
Vocabulary:
lathe — токарный станок
circular cross-section — круглое поперечное сечение
surface — поверхность
stationary — неподвижный, стационарный
sideways — в сторону
variety — разнообразие, разновидность
depth — глубина
headstock — передняя бабка
spindle — шпиндель
chuck — зажим, патрон
faceplate — планшайба
lathe bed — станина станка
to enable — давать возможность
tolerance — допуск
General understanding:
1. What are machine-tools used for?
2. How are most machine-tools driven nowadays?
3. What facilities have all machine-tools?
4. How are the cutting tool and the workpiece cooled during machining?
5. What other machining methods have been developed lately?
6. What systems are used now for the manufacture of a range of products without the use of manual labor?
7. What parts can be made with lathes?
8. How can the cutting tool be moved on a lathe?
9. How is the workpiece clamped in a lathe?
10. Can we change the speeds of workpiece rotation in a lathe?
11. What is numerical control of machine tools used for?
Find English equivalents in the text:
1. обрабатываемый материал
2. электропривод
3. более точный
4. отдельные детали
5. процесс массового производства
6. приспособления для держания резца и детали
7. операции по механической обработке детали
8. высоковольтный разряд
9. сверление ультразвуком
10. резание с помощью лазерного луча
11. гибкие производственные системы
12. детали круглого сечения
13. поворачивать деталь вокруг ее оси
14. двигать в сторону, двигать по направлению к детали
15. глубина резания
16. непрерывное вращение детали
17. движение резца вдоль станины
Translate into English:
1. Токарный станок позволяет производить детали круглого сечения.
2. Деталь зажимается в патроне или на планшайбе токарного станка.
3. Резец может двигаться как вдоль станины, так и под прямым углом к ней.
4. Современные токарные станки часто имеют цифровое управление.
«MILLING MACHINE»
In a milling machine thecutter (фреза) is a circular device witha series of cuttingedges on itscircumference. The workpiece is held on a table that controls the feed against the cutter. The table has three possible movements:longitudinal, horizontal, andvertical; in some cases it can also rotate. Milling machines are the mostversatile of all machine tools.Flat or contouredsurfaces may be machined with excellent finish and accuracy.Angles, slots, gear teeth and cuts can be made by using various shapes of cutters.