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1、 Lesson 22 Tool Radius CompensationPPT模板下载： 行业PPT模板： 节日PPT模板： PPT素材下载： PPT图表下载： 优秀PPT下载： PPT教程： Word教程： Excel教程： 资料下载： PPT课件下载： 范文下载： 试卷下载： 教案下载： PPT论坛： TABLE OFCONTENT 1 Passage2 New Words and Expressions3 Notes4 Reading MaterialLesson 12 Parting Surface1. What is Tool Radius Compensation Tool radi
2、us compensation is the act of accommodating for the curing tool radius in order to produce the work piece of the correct geometry.1什么是刀具半径补偿 刀具半径补偿是一种调节刀具半径的行为，其目的是使加工出来的工件具有正确的几何形状。它通常也被称为刀具补偿或刀尖圆弧半径补偿。Lesson 12 Parting SurfaceNoteaccommodate在这里是调节的意思，而不是我们熟悉的提供住宿、容纳的意思。2. How Cutter Radius Compens
3、ation Works Understanding how the CNC control interprets motions under the influence of cutter radius compensation should help you learn how to use it and avoid problems with programming. In basic terms, you will tell the control (by a G code) the relationship of the milling cutter to the workpiece
4、during the machining operation. Either the cutter will be on the left side (G41) or right side (G42) of the workpiece as it machines the contour. Once cutter radius compensation is properly instated, the control will keep the milling cutter to the left or right (depending upon your choice) of all mo
5、tions programmed. This can be a little difficult to visualize, especially for beginning programmers. The CNC control will automatically keep the cutter center away from the programmed path by the amount of the specified cutter radius compensation offset. This is what allows you to program the work s
6、urface contour and let the control figure out the cutters centerline path.2如何使用半径补偿面 了解CNC控制器在施加刀具半径补偿时如何编译运动，将十分有助于了解如何在程序中使用半径补偿并避免出错。简单地说，程序员需要告诉（通过G命令）控制器加工过程中铣刀和工件的位置关系。加工轮廓时，刀具或者在工件左边（G41），或者在右边（G42）。合理设定半径补偿后，铣刀完成程序中要求的所有动作时，控制器都要求它处于刀具的左边或者右边(根据程序员选择)。这特别是对初学编程者而言可能有点难以想象。CNC控制器会自动让刀心偏离编程轨迹，
7、偏移的尺寸为特定刀具半径补偿偏置量。正因为如此，我们才可以直接对工件表面进行编程，而将计算刀心轨迹的工作留给控制器。 Lesson 12 Parting Surface 在图示例子中，在从点l到点2的过程中设置了半径补偿（注意点1是刀心位置）。设置半径补偿后，注意控制器自动使刀具偏移到运动路线的右边（见图22-l）。控制器应该让刀具处于工件表面轮廓右侧多远的地方，则由刀具半径补偿偏置值（刀具半径）确定。 In this example, cutter radius compensation will be instated during the movement from point one
8、to point two (notice that point one is the cutters center line position).Once instated, notice how the control will automatically keep the cutter to the right side (Figure 22-1) of all programmed movements. How much to the right side of the work surface contour the control will keep the tool is spec
9、ified in the cutter radius compensation offset (the cutters radius). Figure 22-1 the relationship of cutter center line path to work surface path图22-1 刀心轨迹与工件表面轨迹的关系Lesson 12 Parting SurfaceNote本句的主语是个从句How much to the right side of the work surface contour the control will keep the tool. Two things
10、 are especially difficult for beginning programmers to visualize. Almost all problems a beginner will have with cutter radius compensation stem from one of these two difficulties. First is the instating movement (the movement from point one to point two). Prior to instating compensation, you must po
11、sition the tool to a location larger than the cutter radius away from the first surface to be machined (point one in this example). Second is the approach and retract of the tool. Notice that the first portion of the movement from point two to point three and the movement from point thirteen to four
12、teen are not actually part of the workpiece, yet they must be included within the work surface path. 对初学者而言，有两个问题不好理解，关于半径补偿的所有问题几乎都源自这两个问题。首先是设置移动（从点l到点2）。设置补偿之前，必须将刀具置于一个位置，这个位置与第一个加工面间的距离应大于刀具半径（在本例的点l处）。其次是刀具接近工件和回退到安全位置的运动。注意，点2到点3的前一部分移动和点13到点14的移动实际并不是工件加工所需要的，但却必须编写在工件表面运动轨迹之内。 Lesson 12 Par
13、ting Surface 有了半径补偿，轮廓的粗加工和精加工就可以用相同的工件表面进行编程。但是刀具半径补偿只能用于铣削中。尽管具有局限性，但是它不需要程序员计算二维坐标，正是这一原因使得半径补偿被大多数手工编程员采用。 Cutter radius compensation makes it possible to use the same work surface coordinates needed for finish milling a contour to be used to rough the contour. However, cutter radius compensatio
14、n will be used only for milling cutters. Though there are some limitations, this eliminates the need for the programmer to calculate two sets of coordinates. This reason for using cutter radius compensation applies most to manual programmers.Lesson 12 Parting Surface accommodate =k6m=deit vt. 调节 visualize vIzjU=laIz vt. 可视化，形象，形象化， 想象 vi. 显现 instate insteit vt. 任命，指定 interpret int=:prit v. 解释，说明，口译 New Words and Expressions figure fiG=(r) out v. 合计为，计算出，解决， 断定，领会到 stem stem vi. 起源 retract ritr7kt v. 回退，缩回，缩进，收回，取 消，撤销Lesson 12 Parting Surface
