機(jī)械專業(yè)類英語(yǔ)文章閱讀

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　　機(jī)械專業(yè)類英語(yǔ)文章摘抄

　　Types of Control Systems

　　控制系統(tǒng)的類型

　　There are two basic types of control system in numerical control:point-to-point andcontouring. In the point-to-point system, also called positioning, each axis of the machine isdriven separately by leadscrews and, depending on the type of operation, at different velocities.

　　數(shù)控有2種基本類型,點(diǎn)對(duì)點(diǎn)式和輪廓式控制,點(diǎn)對(duì)點(diǎn)式控制也稱定位控制,每個(gè)軸都是通過絲杠單獨(dú)驅(qū)動(dòng),根據(jù)加工類型不同,加工速度也不一樣。

　　The machine moves initially at maximum velocity in order to reduce nonproductive time butdecelerates as the tool reaches its numerically defined position.

　　機(jī)器開始以最大速度運(yùn)行來減少非加工時(shí)間,但當(dāng)他達(dá)到數(shù)據(jù)定義的位置時(shí),機(jī)器開始減速。

　　Thus in an operation such as drilling or punching, the positioning and cutting take placesequentially.

　　因此在一個(gè)操作中,如鉆或沖孔操作先定位在加工。

　　After the hole is drilled or punched, the tool retracts, moves rapidly to another position, andrepeats the operation.

　　在鉆或沖孔之后,迅速收起工具移動(dòng)到另一個(gè)位置重復(fù)此操作。

　　The path followed from one position to another is important in only one aspect: The timerequired should be minimized for efficiency.

　　從一個(gè)位置移到另一個(gè)位置是非常重要的,要遵循一個(gè)原則,從效率上考慮只要時(shí)間最短即可。

　　Point-to-point systems are used mainly in drilling, punching, and straight milling operations.

　　點(diǎn)對(duì)點(diǎn)系統(tǒng)主要用于鉆,沖孔,直銑操作中。

　　In the contouring system, also known as the continuous path system, positioning and cuttingoperations are both along controlled paths but at different velocities. Because the tool cuts asit travels along a prescribed path, accurate control and synchronization of velocities andmovements are important.

　　輪廓式也就是連續(xù)路徑式系統(tǒng),定位和切削同時(shí)按不同速度來控制,由于刀具在指定路線運(yùn)動(dòng)同時(shí)切削,因此速度和運(yùn)動(dòng)的同步控制是非常重要的。

　　機(jī)械專業(yè)類英語(yǔ)文章鑒賞

　　線性差補(bǔ)

　　Linear interpolation for creating a circular path would be quite inappropriate because the programmer would be required to specify the line segments and their respective end points that are to be used to approximate the circle.

　　線性差補(bǔ)用來差補(bǔ)圓是不合適的因?yàn)槌绦蛟葱枰鞔_指定線段部分,線段數(shù)量和各自的終點(diǎn)來大約模擬圓弧。

　　Circular interpolation schemes have been developed that permit the programming of a path consisting of a circular arc by specifying the following parameters of the arc: the coordinates of its end points, the coordinates of its center, its radius, and the direction of the cutter along the arc.

　　使用圓弧只要給定以下參數(shù),圓弧終點(diǎn)坐標(biāo),圓心坐標(biāo),半徑和刀具沿圓弧路徑的走刀方向。

　　The tool path that is created consists of a series of straight-line segments, but the segments are calculated by the interpolation module rather than the programmer.

　　差補(bǔ)也是由許多小的直線段來實(shí)現(xiàn)的,但這些小線段的參數(shù)由差補(bǔ)模塊來計(jì)算出來的,而不是程序員設(shè)定的。

　　The cutter is directed to move along each line segment one by one in order to generate the smooth circular path.

　　切削是沿著每一小線段一個(gè)一個(gè)的進(jìn)行以產(chǎn)生光滑曲線路徑。

　　A limitation of circular interpolation is that the plane in which the circular are exists must be a plane defined by two axes of the NC system.

　　圓弧差補(bǔ)的局限性是圓弧路徑所在平面是由數(shù)控系統(tǒng)中兩軸所決定的平面。

　　機(jī)械專業(yè)類英語(yǔ)文章賞析

　　螺旋線差補(bǔ)

　　Helical interpolation combines the circular interpolation scheme for two axes described above with linear movement of a third axis. This permits the definition of a helical path in three-dimensional space.

　　螺旋線差補(bǔ)結(jié)合了環(huán)形差補(bǔ)兩軸在第三軸上做線性運(yùn)動(dòng)這樣來定義空間三維螺旋路徑。

　　Parabolic and cubic interpolation routines are used to provide approximations of free-form curves using higher-order equations.

　　拋物線差補(bǔ)和立方差補(bǔ)法通過高次高程來實(shí)現(xiàn)自由曲線。

　　They generally require considerable computational power and are not as common as linear and circular interpolation.

　　這通常需要有強(qiáng)的計(jì)算能力，正因如此，他不如直線差補(bǔ)和環(huán)形差補(bǔ)常見。

　　Their applications are concentrated in the automobile industry for fabricating dies for car body panels styled with free-form designs that cannot accurately and conveniently be approximated by combining linear and circular interpolations.

　　他們主要用于汽車工業(yè)中具有自由風(fēng)格的車身面，而這是線性差補(bǔ)和圓弧差補(bǔ)不能精確容易得到的

　　The most common application of numerical control is for machine tool control. This was the first application of NC and is today the most important commercially.

　　數(shù)控技術(shù)運(yùn)用于數(shù)控機(jī)床，這是數(shù)控的主要應(yīng)用?，F(xiàn)在主要用于商業(yè)。

　　In this section we discuss the machine tool applications of NC with emphasis on metal machining.

　　我們?nèi)杂懻摂?shù)控系統(tǒng)特別是金屬數(shù)控車床。