190柴油机曲轴数控铣削加工的分析探讨

曲轴是发动机的主要零件,其加工质量和加工效率直接影响发动机的工作性能和制造。曲轴粗加工采用CNC外铣加工工艺,使工件的加工精度、适应多品种生产的柔性和质量的稳定性都有了明显的改善。我厂引进了两台数控曲轴外铣铣床,特别适合于那些对平衡块侧面需要加工、轴颈没有沈割槽的曲轴。其较之车削、内铣等工艺,具有更高的生产效率。以济柴190型柴油机曲轴加工为实例,简要讲述了用数控曲轴铣床进行曲轴粗加工、半精加工的铣切工艺过程步骤和优点。     

基于VERICUT的五轴数控加工仿真与优化

虚拟加工平台的构建、数控加工程序的正确性验证及加工过程的仿真与优化及是五轴数控机床实现高效加工的重要基础技术。基于VERICUT数控加工仿真与优化平台,以非正交五轴数控机床DMC70ev为研究对象,构建了数控加工仿真平台;以曲面加工为例,建立了基于恒定体积去除率和恒定切屑厚度的优化设计数学模型,进行了刀位轨迹的优化。应用表明:研究成果实现了五轴数控加工过程仿真及数控加工程序的正确性验证,减少了刀具磨损,提高了加工效率与加工质量,可以较好地提升企业数控加工技术的应用水平、应用质量,推动现代制造技术的发展。     

Shared and service-oriented CNC machining system for intelligent manufacturing process

To improve efficiency, reduce cost, ensure quality effectively, researchers on CNC machining have focused on virtual machine tool, cloud manufacturing, wireless manufacturing. However, low level of information shared among different systems is a common disadvantage. In this paper, a machining database with data evaluation module is set up to ensure integrity and update. An online monitoring system based on internet of things and multi-sensors "feel" a variety of signal features to "percept" the state in CNC machining process. A high efficiency and green machining parameters optimization system "execute" service-oriented manufacturing, intelligent manufacturing and green manufacturing. The intelligent CNC machining system is applied in production. CNC machining database effectively shares and manages process data among different systems. The prediction accuracy of online monitoring system is up to 98.8% by acquiring acceleration and noise in real time. High efficiency and green machining parameters optimization system optimizes the original processing parameters, and the calculation indicates that optimized processing parameters not only improve production efficiency, but also reduce carbon emissions. The application proves that the shared and service-oriented CNC machining system is reliable and effective. This research presents a shared and service-oriented CNC machining system for intelligent manufacturing process.     

A manufacturing model of an end mill using a five-axis CNC grinding machine

This paper presents a manufacturing model of a flat-end mill using a five-axis computer numerical control (CNC) grinding machine. The profile of the helical groove can be precisely calculated using a given wheel profile and the relative movements between the workpiece and the grinding wheel. The results of the calculation of the numerical control (NC) data for all the grinding processes of the end mill are fully presented in the paper. The NC data for the machining end mill were generated from the developed program by using the given design parameters of tool geometry, wheel geometry, wheel setting, and machine setting. The effects of the design and manufacturing of the end mill were analyzed based on the computer simulation and experiment results. This study provides a practical and efficient model for the manufacturing of an end mill using a CNC grinding machine with simple programming techniques. The prediction of the end mill geometry for the designing of the proper configuration of the end mill before manufacturing and generating the NC code for machining in a CNC machine is necessary to save time and to reduce the manufacturing cost.     

基于AutoCAD的数控铣床图形编程中DXF文件的读取

文章阐述了基于AutoCAD的数控铣床图形编程系统设计中DXF文件的读取问题.数控铣床图形编程系统的设计是通过DXF文件,并加入加工工艺信息等,可以自动地生成ISO标准代码的数控加工程序.在此基础上,图形编程系统可以进行加工过程模拟、NC代码检验.文章重点介绍用于图形编程中的DXF文件如何读入与处理.     

数控机床半实物仿真培训系统的研究

为满足数控机床操作人员培训的需要,研究开发数控机床半实物仿真培训系统。该系统可以模拟数控加工的整个过程,包括数控程序的编辑、数控机床的操作控制以及工件材料的去除过程。具有操作真实感强、成本低、便于更新和维护等特点。     

数控机床加工精度的影响因素及优化策略

先进的数控机床被应用在制造业中,不仅能够提高制造效率,还能保证制造质量。虽然从整体发展情况来看,数控机床得到了良好的应用,但是在具体的应用过程中仍然存在一些问题。数控机床的作用能否充分发挥出来在很大程度上受加工精度的影响,目前部分被应用在制造业中的数控机床存在较为严重的加工精度问题,如果不对现存问题进行科学有效的解决,将会严重影响制造业的稳定发展。本文在具体的研究过程中从数控机床的概述入手,分析了影响数控机床精度的因素,并且根据影响因素提出了切实可行的解决策略。     

Electrical discharge machining of electron beam melting formed shrouded blisk

Shrouded blisk components are one of the core parts in aerospace engines. Five-axis or six-axis electrical discharge machining is once regarded as the best solution to manufacturing these components. The machining process, however, is time consuming and money cost. In this paper, an electron beam melting (EBM) and electrical discharge machining (EDM) combined method for shrouded blisks manufacturing was presented. In the new method, EBM was used to generate the near-net forming blank of the shroud blisk, and EDM was responsible for finish machining. The mechanical properties of the EBM formed Ti6Al4V blank was tested to be good enough for shrouded blisks. A visual identification method was proposed to establish the machining reference on the EBM formed blisk blank for the subsequent EDM process. The given example showed the required blade accuracy of ±0.03 mm can be achieved by the visual identification method. Through the combination of EBM and EDM method, the machining time of the shrouded blisk was greatly reduced by 54.8 %.     

数控机床加工质量影响因素分析

近几年,我国的制造行业飞速发展,而数控加工是其生产过程中非常重要的一环,并且数控加工的质量将直接决定制造业的发展进程,不过目前数控加工过程中,存在一些影响数控加工质量的因素,本文对影响数控加工质量的因素进行深入分析,研究数控机床的组成部分,得出影响其质量的原因,表明我国的数控加工还存在提高的空间,为此本文提出这些影响因素的解决策略,希望为数控加工行业提供一些帮助。     

数控加工特种回转面刀具时工艺参数的自动检测建模

为了确保数控加工硬质合金特种回转面刀具的刀刃形状和零刃带宽度 ,需要对砂轮相对于工件的位置等相关工艺参数进行检测。提出了有关工艺参数的自动检测建模方法 ,认为运用此方法可显著提高工件的加工精度。     

Machining of plate cam profiles on CNC machine tools using a highly integrated part programming system

The concept of NC (Numerical Control) and CNC (Computerised Numerical Control) in machine tools has contributed a great deal to automation and flexibility in manufacturing. In small/medium batch manufacturing, machining of complex contours with conventional machining is neither economical nor accurate. These can be achieved on a CNC machining centre more economically. The can machining system is designed to provide the necessary CNC program blocks for machining the plate cam profiles. The cam profiles can be defined by geometric curves, by follower motion or through a set of points. A promising new concept for approximating the tool path close to the defined cam profile, within the specified tolerance, has been proposed. The CLIP algorithm, presented in this paper, automatically chooses the best of the available interpolations (e.g. linear and circular interpolations) for selecting the intermediate points on the profile to guide the cutter for machining the profile. It provides the minimum number of intermediate points. This module can also be used for machining the elliptical profiles and pockets. The cam module, with little modification, is also used for machining the scroll threads of any pitch.     

基于CAD/CAM软件的股骨模型三维重建及数控加工

运用通用CAD/CAM软件Mimics,Imageware,CATIA,对股骨模型进行三维模型重建及数控加工程序编制,配备四轴数控雕刻机床进行数控加工,提出了一套完整的股骨模型三维重建及数控加工的方法.     

NC data generation for 6-axis machine tools to produce a helical drill

This study presents a design methodology for grinding a specific helical drill on a CNC 6-axis grinding machine. The proposed methodology comprises three steps: (1) deriving a mathematical model of the helical drill, (2) establishing the ability matrix of the multi-axis grinding machine according to Denavit-Hartenberg (D-H) notation, and (3) constructing configuration matrices to express the required grinding wheel positions and orientations while machining the flute and flank surfaces of the drill. The NC data for the motion values of each axis are obtained by equating the corresponding elements of the CNC ability matrix and the configuration matrices of the grinding wheel. To verify the proposed methodology, a designed helical drill is machined on a 6-axis CNC tool-grinding machine. The methodology presented in this study integrates the drill design and manufacturing activities, thereby making possible the implementation of a more flexible, automatic, cost efficient and controllable design and production process.     

CIMT’97主要展品的技术特点综述

两年一度的中国国际机床展览会是国际机床界和我国机械制造业的一件盛事。第五届中国国际机床展览会(CIMT’97)又一次荟萃了国内、外各机床厂及相关配套件厂和工具厂的精华,既可看到一些名牌企业享有盛名的产品,也会发现一些脱颖而出的新秀企业所展示的精品。从展览会上我们能深刻地领会到机床工具行业的发展动向,也能生动地观察到琳琅满目的新产品和新结构。从中既反映了丰富多采的世界先进实用制造技术和最新制造技术,也展示了中国机床工具行业通过“三大战役”在增强开发能力和竞争实力方面所取得的可喜的巨大进步。     

SB25125凸轮轴高速外铣

SB25125凸轮轴高速外铣是以刀盘的高速旋转为切削的主运动,凸轮轴慢速旋转一周完成一个轴径或连杆径的加工过程以及完成辐板的外径和侧面的加工的高效数控铣床。     

多面形圆弧型面联接的几何设计与数控加工控制原理研究

对多面形圆弧型面联接的几何设计方法和数控磨削加工控制原理进行了系统深入的分析研究 ,创建了关于任意n面圆弧型面几何设计和加工控制的两个定理 ,介绍了实现多面形数控磨削加工的机床的具体配置     

面向数控加工过程的可重配置虚拟加工方法

结合虚拟制造技术对数控加工仿真系统进行了研究,在分析虚拟制造中数控加工仿真技术的基础上,提出了一种可重配置的虚拟加工方法。这种方法通过建立虚拟的部件及部件关系树,根据所需机床的不同类型,来对数控机床的结构进行不同的配置;其中毛坯模型的建立采用的是voxel模型法。此外,运用C++和OpenGL作为开发工具,实现了对数控加工过程的虚拟仿真(即虚拟制造);同时实际应用表明,在虚拟的加工环境下,机床对数控程序的验证时间大大缩短。     

整体式叶轮的三维造型及数控加工

整体式叶轮的加工应在多轴数控加工中心上进行,并借助CAD/CAM软件和数控加工仿真软件,进行三维造型、自动编程和数控仿真加工.应用CAXA制造工程师和VERICUT软件,对整体式叶轮进行三维造型、自动编程和仿真校验,可在实际数控加工该零件之前,及时检查出多轴数控加工程序中出现的刀具干涉与碰撞等问题;对多轴数控加工程序的不足进行调整和修改,可提高多轴数控加工中NC程序的准确性和可靠性;协助工艺员编制出准确和合理的数控加工工艺,可保证整体式叶轮数控加工的高效率、高质量和高精度.     

基于普通铣床的数控化改造

世界先进制造技术兴起和不断成熟,数控加工技术提出了更高的要求.数控机床已成为衡量一个国家机械制造水平的重要标志.数控铣床是一种加工功能很强的数控机床.分析了普通铣床数控化改造的必要性,数控化改造的特点,数控化改造的条件,提出了数控化改造的内容,数控系统的选择,数控改造中主要机械部件改装探讨,数控化改造的一般步骤.     

透平叶片五轴数控加工工艺技术研究

针对透平叶片,提出了一种加工工艺过程和编程方法。根据叶片的几何特性,安排合适的加工策略,对生成的刀具轨迹进行仿真,并在五轴加工中心上进行试切,最后在三坐标上检测,经验证叶片的加工质量达到设计要求。