机械考研专业英语

个连续的、螺旋路径。

十一、

To

achieve

this

arrangement

,

it

is

required

that

one

gear

should

be

of

the

right-hand

design and that the other be left-hand with an equal helix angle .

If both gears in mesh are of the same hand , the shafts will be at 90 degrees to each other . Such

gears are called crossed helical gears.

为了实现这一安排

,

这就要求我们一个齿轮应设计为右旋

,

另一个是 有相同螺旋角的左旋的。

如果两个啮合的齿轮是相同的旋向

,< /p>

轴将会相互成

90

度。这种被称为交错轴 斜齿轮。

第六课

十二、

The components of atypical rolling contact bearing are the inner race , the outer race , and

the rolling elements .

滚动轴承的典型结构是内圈，外圈，滚动体。

十三、

The axial components of the forces on

helical gears , worms and wormgears , and bevel

gears are thrust loads .

在斜齿轮，涡轮蜗杆和锥齿轮上受的轴向力为推力。

十四、

The inner race is typically pressed on the shaft at the bearing seat with a slight interference

fit to ensure that that it rotates with the shaft .

第七课

十五、

Some

designers

prefer

flat

belts

for

delicate

machinery

because

the

belt

will

slip

if

the

torque tends to rise to a level high enough to damage the machine .

一些设计师喜欢把 平皮带用在精密机械上

,

因为如果扭矩趋于上升到一个高等级< /p>

,

会损坏机器

时，皮带可以滑动。

第一课

Marketing professionals are often employed to manage the definition of customer expectations,

but designers will likely work with them

as

a

part

of

a

product development team.

< /p>

经常请市场专业人员来对顾客期望进行评定，

但设计人员却很可能 作为产品开发小组的一部

分与市场专业人员一起合作。

One

popular

method

,called

quality

function

deployment

or

QFD,

seeks(1)to

identify

all

of

the

features and performance factors that customer desire and(2) to assess the relative importance

of these factors. < /p>

一种通用的方法，称为质量功能展开（简称

QFD

）

，寻求识别顾客期望的所有特征和性能因

素，并用于 评定这些因素之间的相对重要性。

Ii is also important to consider how the design process fits with all functions that must happen to

deliver a satisfactory product to the customer and to service the product throughout its life cycle.

考虑设计过程如何满足所有功能也是很重要的。这些功能必须 恰好把满意的产品交给顾客，

并在整个产品的生命周期内服务该产品。

< br>

Section 1 emphasized the importance of carefully identifying the needs and expectations of the

customer prior to beginning the design of a mechanical device.

在第一部分强调了在开始设计机

械装置之前仔细地了解顾客要求与期望的重要 性。

第二课

The

other

elements

affect

hardenability,

toughness,

corrosion

resistance,

machinability,

and

strength retention at high temperatures.

其他元素影响硬度，韧性，防腐蚀性，可加工性以及高温 下强度保持性。

Although most steel alloys contain less than 1.0%carbon,it is included in the designation because

of its effect on the properties of steel.

尽管大多 是合金钢中碳的含量不足

1.0%

，但由于它会影响钢的特性， 因此，合金钢的牌号

中要包含碳的含量。

Whereas most uses of tool

steels are

related to the field of manufacturing engineering, they

are also pertinent to machine design where the ability to maintain a keen edge

under abrasive

conditions is required.

尽管大部 分工具钢都用在与制造工程相关的领域，

然而，

在腐蚀环境下，

需要保持边缘锋利

时，也与机床设计有关。

Also,

some

tool

steels

have

rather

high

shock

resistance

which

may

be

desirable

in

machine

components

such

as

parts

for

mechanical

clutches,

pawls,

blades,

guides

for

moving

materials

and clamps.

同样，

一些工具钢也具有比较高的抗冲击能力，

这种抗 冲击能力对机床零件是很

有利的，如机床离合器，棘爪，刀刃等零件，移动部件中的导向 装置以及夹具。

第三课

Thermosetting

plastics

do

undergo

some

changes

during

forming

and

result

in

a

structure

in

which

the

molecules

in

which

the

molecules

are

cross

linked

and

formed

a

network

of

interconnected molecules

成型期间，

热固性塑料结构的确要发生一些改变，

< br>造城防分子交叉连接，

分子之间形成一种

网络。