機械專業類英語文章閱讀
機械市場是機械、機電設備流通的重要載體,是專業市場的一類,也是現有的主要商業建築類型之一。下面小編整理了機械專業類英語文章，希望大家喜歡!
Types of Control Systems
控制系統的類型
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.
數控有2種基本類型,點對點式和輪廓式控制,點對點式控制也稱定位控制,每個軸都是通過絲槓單獨驅動,根據加工類型不同,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.
機器開始以最大速度運行來減少非加工時間,但當他達到數據定義的位置時,機器開始減速。
Thus in an operation such as drilling or punching, the positioning and cutting take placesequentially.
因此在一個操作中,如鑽或衝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.
在鑽或衝孔之後,迅速收起工具移動到另一個位置重複此操作。
The path followed from one position to another is important in only one aspect: The timerequired should be minimized for efficiency.
從一個位置移到另一個位置是非常重要的,要遵循一個原則,從效率上考慮只要時間最短即可。
Point-to-point systems are used mainly in drilling, punching, and straight milling operations.
點對點系統主要用於鑽,衝孔,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.
輪廓式也就是連續路徑式系統,定位和切削同時按不同速度來控制,由於刀具在指定路線運動同時切削,因此速度和運動的同步控制是非常重要的。
機械專業類英語文章鑑賞線性差補
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.
線性差補用來差補圓是不合適的因爲程序源需要明確指定線段部分,線段數量和各自的終點來大約模擬圓弧。
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,圓弧終點座標,圓心座標,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.
差補也是由許多小的直線段來實現的,但這些小線段的參數由差補模塊來計算出來的,而不是程序員設定的。
The cutter is directed to move along each line segment one by one in order to generate the smooth circular path.
切削是沿着每一小線段一個一個的進行以產生光滑曲線路徑。
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.
圓弧差補的侷限性是圓弧路徑所在平面是由數控系統中兩軸所決定的平面。
機械專業類英語文章賞析螺旋線差補
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.
螺旋線差補結合了環形差補兩軸在第三軸上做線性運動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.
拋物線差補和立方差補法通過高次高程來實現自由曲線。
They generally require considerable computational power and are not as common as linear and circular interpolation.
這通常需要有強的計算能力，正因如此，他不如直線差補和環形差補常見。
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.
他們主要用於汽車工業中具有自由風格的車身面，而這是線性差補和圓弧差補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.
數控技術運用於數控機牀，這是數控的主要應用。現在主要用於商業。
In this section we discuss the machine tool applications of NC with emphasis on metal machining.
我們仍討論數控系統特別是金屬數控車牀。
