五轴联动数控系统RTCP技术的研究与实现

为了实现高效的五轴加工,本文对五轴RTCP技术进行深入研究,通过对旋转角度的细分及插补点处非线性误差补偿,减小了加工中的非线性误差并满足补偿算法的实时性,通过对各轴速度进行约束的前瞻算法、减小了加工过程中的机床振动,从而提高了工件表面的加工质量.本文提出采用基于参数配置的运动学模型,提高了工件程序的可移植性.最后将该算法添加到GJ-310数控系统中,并进行了试验验证,结果表明该算法可以满足加工要求.     

通用RTCP算法的研究与设计

由于旋转运动的影响,五轴加工时会产生非线性运动误差.RTCP(旋转刀具中心点)功能可使数控系统自动对控制轴进行实时线性补偿,从而保证插补点始终位于编程轨迹上.在深入分析五轴机床运动结构的基础上,设计一种集成了RTCP功能的插补算法,并给出了算法的理论误差分析以及仿真实验结果.实验结果表明该算法可以有效减小非线性误差,且简单易行,还能充分满足实时性要求,可广泛应用于现代CNC系统中.     

西门子840D系统精度补偿研究

本文章介绍了数控系统精度补偿目的及类型,阐述了几类精度补偿原理及方法,针对于西门子840D系统的精度补偿技术进行分析,并对该系统的几个主要补偿功能进行讲解.     

RTP／RTCP流量控制算法

在介绍RTP／RTCP协议的基础上,详细研究了四种常用的流量控制算法：常数乘增长和常数乘减少,常数加增长和常数乘减少．变常数增长和常数减少．变常数增长和变常数减少。     

一种新型五轴联动数控系统的研究

在目前的五轴数控加工中,编程人员需针对不同类型的五轴数控机床编制不同的加工程序.针对这一问题,本文研究并设计一种新型五轴联动数控系统.详细描述了该五轴联动数控系统的结构,对其中的RTCP模块和基于四元数的空间运动学变换模块进行了重点探讨,并对该数控系统进行了测试.实验结果表明该数控系统具备一个工作程序在不同结构的机床进行加工的功能.     

RTP/RTCP流量控制算法

在介绍RTP/RTCP协议的基础上,详细研究了四种常用的流量控制算法:常数乘增长和常数乘减少,常数加增长和常数乘减少,变常数增长和常数减少,变常数增长和变常数减少。     

计算机辅助数控机床位置精度自动校准

用一台装有应用软件ＪＨＣＴＳ的微机作为主控机，连接激光测量仪和ＣＮＣ系统，可对各数控轴上任意点的坐标值进行测量采数和误差自动补偿，实现位置精度校准，然后可按各种评定标准规定的方法，再次测量采数、数据处理，对位置精度作出相对应的检定。     

五轴联动激光切割机数控系统空间直线和圆弧插补算法的研究

在示教生成零件加工程序的基础上,讨论了空间直线和圆弧的插补算法以及空间绝对坐标到机床运动坐标的变换,并对插补算法的误差进行了分析.这种插补算法通过控制五个联动的运动轴,可实现空间任意直线和圆弧的插补,从而在理论上使激光切割机能完成对空间曲面的切割加工.     

基于RTP/RTCP协议视频数据网络传输的实现

论文描述了适合实时数据传输的RTP/RTCP协议,提出了基于RTP协议实现网络视频传输的设计思想,应用该协议能较好地实现视频数据的封装和组播传输。这样的传输方法可移植性好,有较广的适应面。     

基于RTCP包解析的音频QoS控制研究

本文提出了基于流媒体传输协议的应用策略和方法．对基于RTP／RTCP协议的音频QoS控制进行了研究并提出一种基于RTCP包解析的提高QoS的控制方案。     

Compensating for systematic errors in 5-axis NC machining

The errors introduced during 5-axis machining are higher than the intrinsic repeatability of the machine tool. It is possible to identify such systematic errors and compensate for them, thus achieving higher performance. A group of systematic errors can be compensated for directly in the inverse kinematics equations. Other systematic errors can be combined and compensated for through the total differentials of the inverse kinematics relations. A new general approach on how to compensate for the systematic errors based on the closed loop volumetric error relations is presented. The errors due to the 5-axis toolpath generation in current CAD/CAM and CNC are analyzed in detail. A new strategy for measurement and compensation is presented.     

Generalization of the imprint method to general surfaces of revolution for NC machining

This paper presents a method of determining the shape of the surface swept by a generalized milling tool that follows a 5-axis tool path for machining curved surfaces. The method is a generalization of an earlier technique for toroidal tools that is based on identifying grazing points on the tool surface. We present a new proof that the points constructed by this earlier method are in fact grazing points, and we show that this previous method can be used to construct grazing points on (and only on) the sphere, the cone, and the torus. We then present a more general method that can compute grazing points on a general surface of revolution. The advantage of both methods is that they use simple, geometric formulas to compute grazing points.     

A non-orthogonal interpolation algorithm for NC machine tools

In numerically controlled systems, the interpolation function is normally implemented with orthogonal-type algorithms, in which each step of the tool is along a single coordinate axis. These algorithms are easier to conceive and realize.Non-orthogonal interpolation, however, offers certain advantages such as improved curve smoothness and increased feedrates. The algorithm presented in this paper makes possible an extension of the feedrate range of the machine by approximately 28% without any other change in the control. The algorithm is applicable to plane curves, defined implicity by an equation of the form $\text{? (x,y) = 0}$.     

高档数控系统NC模块设计

本文阐述了高档数控系统NC模块的设计和实现,并详细介绍了NC模块的设计原理,功能流程,解释程序的设计方法以及运行执行程序的设计实现。本文从高档数控系统的设计架构出发,站在高处,对高档数控系统的设计开发起到了积极的指导和借鉴意义。     

NC tool path generation for 5-axis machining of free formed surfaces

This paper presents a tool axis vector approach for machining sculptured surfaces. Such an approach is well suited for highly twisted, rolled, or bent surfaces. The tool paths are generated for a 5-axis milling machine. The proposed approach is based on tilt angle, cutting direction, and a vector normal to the cutting surface. Gouging is avoided by checking the interference between the cutting tool and the part surface. The algorithm also finds maximum path intervals that generate maximum admissible cusp height within the specified tolerance limits. Such an approach minimizes the tool path and machining time. The paper presents an example to illustrate the details of the algorithm.This research was accomplished by funding provided by the Korean Research Foundation under the Faculty Research Abroad Program and by the advice and support of the second author.     

基于RTP/RTCP的数字视频监控系统的设计与实现

随着网络技术和多媒体通信技术的发展,基于因特网的数字视频监控系统已经广为应用。本文分析了支持多媒体传输的协议,提出了一个基于RTP/RTCP协议的数字视频监控系统模型,详细介绍了视频服务器和客户端的实现,并将该系统应用到实际中,结果表明所提出的模型是有效而实用的。     

基于UMAC的高精密机床开放式数控系统探析

文章以高精密五轴机床为对象、以UMAC为基础,开发了一套开放式数控系统。首先﹐在Windows 10操作系统下构建了硬件平台;然后,进行了相关的软件系统设计。在设计过程中,通过多种模块化的方法,实现系统的不同功能--包括对机床的控制、工艺参数设置以及人机交互等;最后,通过试验验证了开放式数控系统的可用性。     

Modeling of cutting geometry and forces for 5-axis sculptured surface machining

5-Axis sculptured surface machining is simulated using discrete geometric models of the tool and workpiece to determine the tool contact area, and a discrete mechanistic model to estimate the cutting forces. An extended Z-buffer model represents the workpiece, while a discrete axial slice model represents the cutting tool. Determination of the contact area for a given tool move requires a swept envelope (SWE) of the tool path. The SWE is used to find the intersections of the tool envelope with Z-buffer elements (ZDVs) representing the workpiece. A 3-axis approximation of the 5-axis tool movement is used to simplify the calculations while maintaining a desired level of accuracy. The intersection of the SWE with each ZDV yields segments which are used to find the contact area between the cutter and the workpiece for a given tool path. The contact area is subsequently used with the discrete force model to calculate the vector cutting force acting on the tool.     

可重构嵌入式数控系统的研究

提出了一种可重构的嵌入式数控系统,通过与安装有网格中间件和网格支持工具的上位机相连,可以很方便地作为制造网格的一个可重构节点.在硬件设计上,主控系统、插补和补偿模块以及伺服模块通过CAN总线互连,实现嵌入式数控系统硬件的可重构性.在软件设计上,采用软件芯片的思想,同时设计数控软件自动生成系统,实现了软件的可重构性.