共查询到19条相似文献,搜索用时 78 毫秒
1.
一种自由曲线拟合及插补方法 总被引:1,自引:0,他引:1
为了提高自由曲线、曲面的加工性能 ,本文在对自由曲线、曲面拟合方法研究的基础上 ,介绍一种曲率连续的自由曲线、曲面拟合法—— Clothoid曲线法 ,并详细推导了 Clothoid曲线插补算法 相似文献
2.
3.
4.
5.
6.
7.
CNC系统中任意空间曲线的插补方法 总被引:1,自引:0,他引:1
针对机床CNC系统中加工任意空间曲线的实际问题,提出了一种基于泰勒(Taylor)公式的用于实时控制的等速进给插补算法,凡是可以表示为矢量参数方程的正则曲线,都可以用该方法进行插补。 相似文献
8.
时间分割法椭圆曲线插补算法 总被引:7,自引:1,他引:6
根据时间分割法的基本思路,提出了一种椭圆曲线的插补算法。该算法不权精度高,理论上可使所有插补占均落在曲线上,而且插补速度快,完全满足CNC系统插补的实时性要求。 相似文献
9.
10.
新二次曲线插补及程序设计 总被引:1,自引:0,他引:1
船舶螺旋桨是具有许多不规则曲面的零件,若采用数控机床来加工,便可以大大提高产品精确度和劳动生产力,也可以降低劳动强度。对复杂曲面的描述,即其数学模型的建立是实现数控加工的关键环节之一。目前有多种方法来描述复杂曲面,但都比较复杂。由哈尔滨船舶工程学院科学工作者发明的新二次曲线样条函数法,具有几何关系明确、计算程序简单等优点,对复杂曲面、曲线的描述具有重要地位。一般的数控机构均配有直线和圆弧插补 相似文献
11.
12.
13.
一种优化的NURBS曲线插补算法 总被引:1,自引:0,他引:1
为弥补目前非均匀有理B样条插补算法的不足,提出一种优化的非均匀有理B样条曲线插补算法。算法采用插补前S曲线加减速方法,不仅优化了前瞻过程,而且在回溯过程中考虑了短样条的情况。算法对长样条和短样条非均匀有理B样条曲线能用统一的方法进行插补,通过引入环形缓冲区和预插补(非离线),提高了加工效率,同时合理地安排插补任务增强了系统的实时性。通过MATLAB仿真,验证了算法的有效性。 相似文献
14.
NURBS曲线高速高精度插补及加减速控制方法研究 总被引:2,自引:1,他引:1
为满足非均匀有理B样条曲线高速高精度插补加工的需要,针对目前参数曲线插补加减速控制方法的不足,提出了一种新的控制方法.该方法考虑了高速高精度加工中容易超限的弓高误差和机床所能承受的法向加速度等因素,使进给速度既符合加减速的要求,又能随曲线曲率自适应调整,因而可在提高轮廓加工精度同时,显著地减小加工过程对机床的冲击.同时,采取了改进、简化算法,实现了快速、实时自适应的非均匀有理B样条曲线插补的加减速控制.实例表明,该方法在实时插补过程中,满足了速度和加减速的要求,保证了插补加工的高速与高精度,且实现了速度的平滑过渡. 相似文献
15.
16.
17.
Daoshan Du Yadong Liu Cunliang Yan Congxin Li 《The International Journal of Advanced Manufacturing Technology》2007,32(9-10):999-1008
In this paper, an adaptive parametric curve interpolator with a real-time look-ahead function is developed for non-uniform rational B-spline curves (NURBS) interpolation, which considers the maximum acceleration/deceleration of the machine tool. In the proposed interpolator, both constant feedrate and high accuracy are achieved while the inconsistency of feedrate is reduced dramatically as well. In order to deal with the acceleration/deceleration around the feedrate sensitive corners, a look-ahead function is introduced to detect and adjust the feedrate adaptively. Two cases were respectively studied to evaluate the feasibility of the developed interpolator: one is for feedrate sensitive arc corner; the other is for feedrate sensitive sharp corner. 相似文献
18.
19.
Haitao Dong Bing Chen Youping Chen Jingming Xie Zude Zhou 《The International Journal of Advanced Manufacturing Technology》2012,63(9-12):1257-1270
In this paper, a novel and accurate real-time non-uniform rational B-spline curve interpolation algorithm is proposed. This algorithm not only considers chord errors, feedrate fluctuations, jerk-limited, and acceleration/deceleration (Acc/Dec) capabilities of the machine, but also optimizes the look-ahead process. In the meanwhile, it improves machining efficiency by adding the circular buffer and pre-interpolation (non-off-line) and enhances the real-time performance by removing the time-consuming calculation from the interrupt service routine. Furthermore, the proposed interpolation algorithm can interpolate both the long spline and the short spline with uniform method. The advantages of the proposed method were confirmed by the simulation results. 相似文献