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This kind of data structure merely is applicable to the sword shaft Z direction three milling imitation .
Mill the operation to be worth by means of the depth that revises cutting tool each a few of movement , and replaces Zmap's value easily , and to replace the work graphic display to every one
3.5 the scattered vector is requestted the intersection law
Since the fact that the now available solid modelling technique does not relate to that the official business fall short of and the camber bias is expressed , the Boolean calculation in pixel element room is not at all exact , and causes imitation certification possess the very great limitations .
For this reason Chappel propose one kind to based on the camber technique " to touch the vector " ( Pointvector ) law .
This kind of means is scattered by the camber according to the specified accuracy , and scatteredly in the way of these comes to express that camber .
With every one scattered law swear is the vector orientation that was touch , the external looks that prolongs against the work is intersected .
By means of the imitation cutting tool cutting action process , calculation every scattered along the law swear up the cutting tool away from S
In case Sg and Sm is separately in the interest of the inside and outward deviation of camber process , in case Sg<'s S's <'s SM's directions process is in inner place the error range , S < SG is piece anxious unduly , and S>sm piece slices by mistake . That means is pided into being cut the requestting intersecting ( Intersection ) three processs of camber scattered ( Discretization ) and examination some fixed position location ( Location ) and scattered some vector together with work entity . Adopt image mapping means to display processing the error figure ; The spare parts face process errors may accurately be depictd out .
The total is baseded on in the solid modelling means geometric model to show against actual process one another unanimously , and to cause between imitation ultimate killing together with design produce exact comparatively becomes the probability ;
Tall yet the technique of solid modelling is requireed , the calculation is measured greatly , and the pragmatic environment of calculating machine that is living at the moment gets off and harder usies to real time examination and dynamic simulation .
Figure image space baseding on means velocity is much fast , and can achieve the real-time emulation , yet thanks to the fact that the initial data wholly transforms to the pixel element value , does not easily carry on the exact examination .
The surface treatment that the scattered vector requests the intersection law to based on the spare parts , be able to accurately depict the spare parts the process error , is chiefly used the camber process error examination
1、数控编程及其发展
数控编程是目前CAD/CAPP/CAM系统中最能明显发挥效益的环节之一，其在实现设计加工自动化、提高加工精度和加工质量、缩短产品研制周期等方面发挥着重要作用。在诸如航空工业、汽车工业等领域有着大量的应用。由于生产实际的强烈需求，国内外都对数控编程技术进行了广泛的研究，并取得了丰硕成果。下面就对数控编程及其发展作一些介绍。
1.1、 数控编程的基本概念
数控编程是从零件图纸到获得数控加工程序的全过程。它的主要任务是计算加工走刀中的刀位点（cutterlocationpoint简称CL点）。
刀位点一般取为刀具轴线与刀具表面的交点，多轴加工中还要给出刀轴矢量
1.2、 数控编程技术的发展概况
为了解决数控加工中的程序编制问题，50年代，MIT设计了一种专门用于机械零件数控加工程序编制的语言，称为APT（AutomaticallyProgrammedTool）。其后，APT几经发展，形成了诸如APTII、APTIII（立体切削用）、APT（算法改进，增加多坐标曲面加工编程功能）、APTAC（Advancedcontouring）(增加切削数据库管理系统)和APT/SS（SculpturedSurface）(增加雕塑曲面加工编程功能)等先进版。来!自~751论-文|网www.751com.cn