作为应用型人才培养的全日制机械工程专业学位研究生,除了具有扎实的理论基础以外,还需要满足机械行业的实际工作需求。下面小编整理了中英文对照机械专业英语文章，希望大家喜欢!

中英文对照机械专业英语文章品析

公差系统

A system of tolerances is necessary to allow for the variations in accuracy that are bound tooccur during manufacture, and still provide for interchangeability and correct function of thepart.

为了允许在制造过程中必然会发生的精度变化 并提供零件的互换性和正确功能 一个公差系统是必需的。

A tolerance is the difference in a dimension in order to allow for unavoidable imperfections inworkmanship. The tolerance range will depend on the accuracy of the manufacturingorganisation, the machining process and the magnitude of the dimension.

公差是为了允许工艺上不可避免缺陷而存在的尺寸上的不同。公差范围取决于制造机构的精度、机加工过程和尺寸的量值。

The greater the tolerance range, the cheaper the manufacturing process. A bilateral toleranceis one where the tolerance range is disposed on both sides of the nominal dimension. Aunilateral tolerance is one where the tolerance zone is on one side only of the nominaldimension, in which case the nominal dimension may form one of the limits.

公差范围越大 则制造过程的成本就越低。双向公差是在公称尺寸两侧都有公差带的公差。单向公差是仅在公称尺寸一侧有公差带的公差 在这种情况下公称尺寸成了两个极限中的一个。

Limits are the extreme dimensions of the tolerance zone. For example, nominal dimension30mm

极限是公差带的极限尺寸。例如公称尺寸30毫米

Fits depend on the relationship between the tolerance zones of two mating parts, and may bebroadly classified into a clearance fit with positive allowance, a transition fit where theallowance may be either positive or negative (clearance or interference), an interference fitwhere the allowance is always negative.

配合取决于两配合零件公差带之间的关系 并且可以概括地分为具有正允差的间隙配合 允差可以是正或负的过渡配合和总是负允差的过盈配合。

经典中英文对照机械专业英语文章

Type of Limits and Fits

极限和配合的类型

The ISO System of Limits and Fits, widely used in a number of leading metric countries, is considerably more complex than the ANSI system.

在一些最主要采用公制的国家中广泛使用的ISO的极限和配合系统，比ANSI的极限和配合系统要复杂得多。

In this system, each part has a basic size. Each limit of size of a part, high and low, is defined by its deviation from the basic size, the magnitude and sign being obtained by subtracting the basic size from the limit in question. The difference between the two limits of size of a part is called the tolerance, an absolute amount without sign.

在这个系统中，每个零件都有基本尺寸。零件尺寸的每一极限，不管大小，都通过对基本尺寸的偏差来定义，其量值和符号由正被讨论的极限减去基本尺寸得到。零件尺寸的两个极限之差称为公差，这是一个没有符号的绝对量值。

There are three classes of fits: 1) clearance fits, 2) transition fits (the assembly may have either clearance or interference), and 3) interference fits.

存在三种配合 1)间隙配合2)过渡配合(装配后可以有间隙或过盈)和3)过盈配合。

Either a shaft-basis system or a hole-basis system may be used. For any given basic size, a range of tolerances and deviations may be specified with respect to the line of zero deviation, called the zero line.

基轴制或基孔制均可采用。对任何给定的基本尺寸，公差范围和偏差可以相对于被称为零线的零偏差线来确定。

The tolerance is a function of the basic size and is designated by a number symbol, called the grade—thus the tolerance grade.

公差是基本尺寸的函数 并通过一个被称为等级的数字符号标明—即公差等级。

The position of the tolerance with respect to the zero line also a function of the basic size—is indicated by a letter symbol (or two letters), a capital letter for holes and a lowercase letter for shafts. Thus the specification for a hole and shaft having a basic size of 45 mm might be 45H8/g7.

公差相对于零线的位置同样为基本尺寸的函数通过一个或两个字母符号表达，大写字母表示孔而小写字母表示轴。这样基本尺寸为45毫米的一个孔和轴配合规格可能是45H8/g7。

Twenty standard grades of tolerances are provided, called IT01, IT0, IT1~18, providing numerical values for each nominal diameter, in arbitrary steps up to 500mm (for example 0~3, 3~6,6~10, ......, 400~500 mm).

ISO规定了二十种标准的公差等级，称之为IT01，IT0，IT1~18，给在直至500毫米强行分段(例如0~3，3~6，6~10, ......, 400~500毫米)中的公称直径提供具体数值。

The value of the tolerance unit, i, for grades 5~16 isWhere i is in microns and D in millimeters.

对5-16级而言，公差单位i的值可用下式计算这里i的单位是微米，而D的单位是毫米。

Standard shaft and hole deviations similarly are provided by sets of formulas, however, for practical application, both tolerances and deviations are provided in three sets of rather complex tables.

标准的轴和孔偏差同样都由若干公式提供?然而对实际应用，公差和偏差都在三张相当复杂的表格中规定了。

Additional tables give the values for basic sizes above 500 mm and for “Commonly Used Shafts and Holes” in two categories—“General Purpose” and “Fine Mechanisms and Horology”.

对基本尺寸大于500毫米和在“一般用途”和“精密机械和钟表”两个类别中的“常用的轴和孔”而言，由附加的表格给出数值。

关于中英文对照机械专业英语文章

Numerical Control of Production Equipment

生产设备的数字控制

Numerical Control (NC) is a form of programmable automation in which the processingequipment is controlled by means of numbers, letters, and other symbols. The numbers,letters, and symbols are coded in an appropriate format to define a program of instructionsfor a particular work-part or job.

数控是程序控制的自动化,在数字控制系统中,设备通过数字,字母和符号来编码,以一种合适的格式为每一个特定的零件或工件定义一个程序指令集。

When the job changes, the program of instructions is changed. The capability to change theprogram is what makes NC suitable for low-and medium-volume production. It is much easierto write new programs than to make major alterations of the processing equipment.

当工件变化时,程序也变化,改变程序的能力亦适合中小批量生产。写一个新程序比改变大量生产设备要容易的多。

Basic Components of NC

数控基本结构

A numerical control system consists of the following three basic components:

数控系统由下面三部分组成

Program of instructions

控制程序

Machine control unit

机器控制单元

Processing equipment

加工设备

The program is fed into the control unit, which directs the processing equipment accordingly.

程序输入到控制单元由送入的程序来引导加工设备控制。

The program of instruction is the detailed step-by-step commands that direct the processingequipment.

指导程序是一步步详细的指导加工设备的指令。

In its most common form, the commands refer to positions of a machine tool spindle withrespect to the worktable on which the part is fixtured.

通常指令把主轴上刀具相对于安装工具的工作台定位。

More advanced instructions include selection of spindle speeds, cutting tools, and otherfunctions. The program is coded on a suitable medium for submission to the machinecontrol unit.

更多先进的说明包括主轴的转速,加工工具的选择及其功能。

The most common medium in use over the last several decades has been 1-in.-wide punchedtape.

程序刻在合适的介质中,提交到机器控制单元中,在过去几十年中,最常用的介质是一英寸宽的打孔纸带。

Because of the widespread use of the punched tape, NC is sometimes called "tape control".However, this is a misnomer in modern usage of numerical control .

由于打孔纸带的广泛使用,NC有时也叫纸带控制,然而这是现代数控使用的误称。

Coming into use more recently have been magnetic tape cassettes and floppy diskettes.

现在进入使用更多的是磁带和软盘。

The machine control unit (MCU) consists of the electronics and control hardware that read andinterpret the program of instruction and convert it into mechanical actions of the machinetool or other processing equipment.

机器控制单元,MCU由电子和控制硬件组成,机器控制单元可以读出和执行指令程序,可以自动改变加工工具和其他加工设备。

The processing equipment is the third basic component of an NC system. It is the componentthat performs useful work.

执行单元是数控系统的第三基础部分,执行原件是有效执行工作的原件

In the most common example of numerical control, one that performs machining operations,

最常见的数控例子其中的一个加工操作,加工设备由工作台和主轴组成,就像用电动机来驱动一样。

The processing equipment consists of the workable and spindle as well as the motors andcontrols needed to drive them.

加工设备由控制单元来驱动控制系统的类型。