Выполните аннотационный перевод текста



Мы поможем в написании ваших работ!


Мы поможем в написании ваших работ!



Мы поможем в написании ваших работ!


ЗНАЕТЕ ЛИ ВЫ?

Выполните аннотационный перевод текста



3. Выполните следующие задания:

а) Выпишите из текста предложения, при переводе которых вы использовали приемы:

- замена простого предложения сложным,

- замена сложного предложения простым,

- членение или объединение предложений,

- изменение типа синтаксической свзяи.

Укажите рядом с выписанным предложением прием перевода и перевод.

 

б). Найдите в тексте и выпишите 2 простых предложения. Переведите.

в) Найдите в тексте и выпишите 2 сложных предложения. Переведите.

Вариант 3.

Переведите текст письменно.

Overview of machining technology

Machining is any process in which a cutting tool is used to remove small chips of material from the workpiece (the workpiece is often called the "work"). To perform the operation, relative motion is required between the tool and the work. This relative motion is achieved in most machining operation by means of a primary motion, called "cutting speed" and a secondary motion called "feed". The shape of the tool and its penetration into the work surface, combined with these motions, produce the desired shape of the resulting work surface.

Types of machining operation]

There are many kinds of machining operations, each of which is capable of generating a certain part geometry and surface texture.

In turning, a cutting tool with a single cutting edge is used to remove material from a rotating workpiece to generate a cylindrical shape. The speed motion is provided by rotating the workpiece, and the feed motion is achieved by moving the cutting tool slowly in a direction parallel to the axis of rotation of the workpiece.

Drilling is used to create a round hole. It is accomplished by a rotating tool that typically has two or four helical cutting edges. The tool is fed in a direction parallel to its axis of rotation into the workpiece to form the round hole.

In boring, a tool with a single bent pointed tip is advanced into a roughly made hole in a spinning workpiece to slightly enlarge the hole and improve its accuracy. It is a fine finishing operation used in the final stages of product manufacture.

In milling, a rotating tool with multiple cutting edges is moved slowly relative to the material to generate a plane or straight surface. The direction of the feed motion is perpendicular to the tool's axis of rotation. The speed motion is provided by the rotating milling cutter. The two basic forms of milling are:

· Peripheral milling

· Face milling.

Other conventional machining operations include shaping, planing, broaching and sawing. Also, grinding and similar abrasive operations are often included within the category of machining.

Выполните аннотационный перевод текста

3. Выполните следующие задания:

а) Выпишите из текста предложения, при переводе которых вы использовали приемы:

- замена простого предложения сложным,

- замена сложного предложения простым,

- членение или объединение предложений,

- изменение типа синтаксической свзяи.

Укажите рядом с выписанным предложением прием перевода и перевод.

 

б). Найдите в тексте и выпишите 2 простых предложения. Переведите.

в) Найдите в тексте и выпишите 2 сложных предложения. Переведите.

 

Вариант 4

Переведите текст письменно.

The cutting tool

A cutting tool has one or more sharp cutting edges and is made of a material that is harder than the work material. The cutting edge serves to separate chip from the parent work material. Connected to the cutting edge are the two surfaces of the tool:

· The rake face; and

· The flank.

The rake face which directs the flow of newly formed chip, is oriented at a certain angle is called the rake angle "α". It is measured relative to the plane perpendicular to the work surface. The rake angle can be positive or negative. The flank of the tool provides a clearance between the tool and the newly formed work surface, thus protecting the surface from abrasion, which would degrade the finish. This angle between the work surface and the flank surface is called the relief angle. There are two basic types of cutting tools:

· Single point tool; and

· Multiple-cutting-edge tool

A single point tool has one cutting edge and is used for turning, boreing and planing. During machining, the point of the tool penetrates below the original work surface of the workpart. The point is sometimes rounded to a certain radius, called the nose radius.

Multiple-cutting-edge tools have more than one cutting edge and usually achieve their motion relative to the workpart by rotating. Drilling and milling uses rotating multiple-cutting-edge tools. Although the shapes of these tools are different from a single-point tool, many elements of tool geometry are similar.

Cutting conditions

Relative motion is required between the tool and work to perform a machining operation. The primary motion is accomplished at a certain cutting speed. In addition, the tool must be moved laterally across the work. This is a much slower motion, called the feed. The remaining dimension of the cut is the penetration of the cutting tool below the original work surface, called the depth of cut. Collectively, speed, feed, and depth of cut are called the cutting conditions. They form the three dimensions of the machining process, and for certain operations, their product can be used to obtain the material removal rate for the process:



Последнее изменение этой страницы: 2016-12-27; Нарушение авторского права страницы; Мы поможем в написании вашей работы!

infopedia.su Все материалы представленные на сайте исключительно с целью ознакомления читателями и не преследуют коммерческих целей или нарушение авторских прав. Обратная связь - 44.192.254.246 (0.011 с.)