德铭纳推出BT560E刀具检测仪

<正>BT560刀具检测仪的机械结构简单,通过一个旋转轴对刀具角度进行调整,高分辨率CCD相机固定在两个直线轴上以调整观测位置,通过图象分析软件对刀具的几何形状进行测量。BT560系列刀具检测仪通常用在刀具制造厂、刀具修磨中心和刀具采购检验部门,可高效精密地     

PCBN刀具在高铬白口铸铁加工中的应用

介绍了用切削高铬白口铸铁的PCBN刀具材质等级选择以及推荐的切削参数,分析了适用于切削高铬白口铸铁的PCBN刀具几何角度以及刃口的修磨.     

刀具修磨教学实验台及麻花钻顶角修磨试验

刀具修磨教学实验台由刀具装夹平台、测量台和磨头部件组成,数控系统核心为基于DSP的运动控制卡,可完成车刀和钻头的测量及修磨功能。本文对教学实验台的机械总体结构和数控系统作了较详细的介绍,并分别进行了麻花钻顶角的测量和修磨试验。     

刀具修磨中的测量技术

数控工具磨床是现代加工制造领域中复杂形状刀具制造和修磨的关键设备,要加工出高性能的刀具,数控工具磨床必须安装高精度的自动测量和对刀系统。本文详细讨论了数控工具磨床中的刀具测量技术。     

高科技刀具研磨

区分高科技刀具与常规刀具体现在刀具几何设计细节的差异上,而这些重要的细节只在建立新一代编程系统时使用。系统按照所要求的刀具几何参数为基础,再计算出工具磨床上所需5轴刀具运动的距离。NUM—ROTOplus软件不仅在技术标准上而且在高科技刀具研磨领域具备全覆盖功能,是越来越多的刀具生产商和刀具修磨商的最佳选择。     

基于图像处理的刀具几何参数测量技术研究

采用图像预处理和边缘检测等图像处理技术自动测量刀具的长度、直径、圆角半径和两个刀刃的角度,利用Delphi平台上开发的基于图像处理的测量软件可以在瞬间检测出刀具几何参数,实现了刀具几何参数测量的自动化。针对刀具的边缘轮廓形状特征,运用了二值化、中值滤波、边缘检测、轮廓提取和参数提取等图像处理技术。使用高分辨率CCD摄像设备并配备光学放大系统,可实现对高精度和微小刀具几何尺寸参数的测量。满足刀具测量的精度高、自动化程度高、重复性好等要求。     

DAREX刀具刃磨机

刀具在整个加工制造成本中，看似只占很小的比例。但在整个加工效率方面，恰恰是刀具在起举足轻重的作用。随着对加工精度要求的提高，对刀具的要求也更高，相对于刀具的成本也在增加，所以刀具的重新修磨就显得更加重要!以往刀具的修磨只局限于人工在砂轮机上修磨，或是由刀具厂家回收修磨，这些方式就都谈不上效率可言；再者，现在操作数控机床、加工中心的技术工人们，不可能在工作初期，用大量的时间来学修磨刀具。     

刀具几何参数可调不重磨的归类分析

按可调和不重磨的要求,规律对刀具几何参数进行归类分析,是其相关性的深刻揭示和刀具调整,重磨,不重磨与刀片转位,调换功能的系统认识和一体化的前提,也是可调式刀具技术趋向全面成熟的重要标志之一。     

某型刀具测量系统的分析与研究

在加工某型飞机的肩轴时,某型刀具的使用效果不理想,一件刀具不能完成一件肩轴的加工,生产效率极低。针对该型刀具的测量系统分析(MSA),运用统计技术分析测量系统的重复性、再现性(Gage R&R)以及可区分类别数(DNC),判断原测量系统不可用。通过对刀具几何角度的特性进行分析与研究提出新的测量方法,并对新的测量系统进行分析,证明新测量系统的适用性。该系统保证了刀具质量,解决了某型飞机肩轴加工效率低的问题。     

基于图像处理的刀具角度测量系统

针对加工过程中刀具磨损会影响零件加工精度的问题,利用图像处理技术实现了刀具角度的测量,以达到对刀具磨损情况进行动态跟踪的目的。以Matlab软件作为图像处理平台,通过图像灰度转换、二值化、边缘提取等技术手段,获得了刀具边缘轮廓,进一步用最小二乘法将轮廓拟合,最终求出了刀具角度。实验结果表明,该方法能较好地测量刀具角度,也可用于刀具几何参数的测试。     

Life prediction system using a tool’s geometric shape for high-speed milling

In recent years, machinery and tool technology has been developing rapidly. The accuracy of operations have also become more and more exact. Elsewhere, raw materials have also been honed, hoping to provide more useful properties than previously. Thus, how to find the best way to prolong the life of a tool subjected to hardened material cutting is the target of this research. Three kinds of tool angle of the endmill are used in this research; clearance angle, rake angle, and helical angle. The cutting conditions are the same; we only change the tool angle for all the cases studied. We attempt to discover better tool geometrical angles for the high-speed milling of NAK80 mold steel. The tool wear rate was measured through a toolmaker’s microscope and the roughness of the machined surface was measured by the roughness-measuring instruments after several complete surface layers were removed from the workpiece in the experiment. Also, a noise-mediator was used to detect the level of cutting noise during each surface layer workpiece removal of the high-speed milling process, and different noise levels were then compared with the tool wear rates for identifying noise characteristics in the case of an over-worn tool state. An abductive network was applied to synthesize the data sets measured from the experiments and the prediction models are established for tool-life estimation and over-worn situation alert under various combinations of different tool geometrical angles. Through the identification of tool wear and its related cutting noise, we hope to consequently construct an automatic tool wear monitoring system by noise detection during a high-speed cutting process to judge whether the tool is still good or not, and, so, the cost of milling can be reduced.     

天然金刚石刀具的研磨及其刃口半径检测技术

指出了天然金刚石刀具的刃口锋利度对现代超精密切削加工的重要影响,介绍了国内外天然金刚石刀具研磨技术的发展现状,以及我国金刚石刀具刃磨技术中普遍存在的问题。详细叙述了对刃磨后刀具刃口半径检测的几种可行方法,展望了刃口半径检测技术的前景。     

Strategies for grinding of chamfers in cutting inserts

In order to increase tool life and improve workpiece quality, cutting processes with geometrically defined cutters demand inserts with a prepared cutting edge. Chamfers are widely used in many processes, since they can provide edge strengthening without damaging the chip flow. In order to achieve a stable and reliable cutting process, uniform chamfer geometry along the insert and high edge quality are necessary. For this, proper grinding strategies for chamfer manufacturing must be taken into account. With the objective of getting knowledge about the chamfer manufacturing process, strategies for grinding of chamfers are investigated in this paper. Chamfers were ground on PCBN, mixed ceramic and cemented carbide cutting inserts with a vitrified bond diamond grinding wheel. A single grain chip thickness model is used to characterize the process and different grinding strategies are analyzed in terms of reduction of chamfer geometry deviation. It was found that high insert rotational speeds increase the edge chipping and that the cutting insert material has a considerable influence on the chamfer geometry deviation.     

CHIP MORPHOLOGY CHARACTERIZATION AND MODELING IN MACHINING HARDENED 52100 STEELS

Hard machining is attracting more and more attention as an alternative to grinding in finish machining some hardened steels. The saw-toothed chips formed in hard machining have their own unique characteristics. The saw-toothed chip morphology is of great interest since the understanding of the saw-toothed chip morphology and its evolution in machining helps unveil hard machining chip formation mechanisms as well as facilitate hard machining implementation into industry. In this study, the effect of tool wear and cutting conditions on the saw-toothed chip morphology was examined in machining 52100 hardened 52100 bearing steel. It was found that the chip dimensional values and segmentation frequency were affected by tool wear and cutting conditions while the chip segmentation angles were approximately constant under different tool wear and cutting conditions. The shear band spacing has also been predicted at the same order of magnitude as the measurement, and improved spacing modeling accuracy is expected if the cutting process information can be better predicted first.     

CHIP MORPHOLOGY CHARACTERIZATION AND MODELING IN MACHINING HARDENED 52100 STEELS

Hard machining is attracting more and more attention as an alternative to grinding in finish machining some hardened steels. The saw-toothed chips formed in hard machining have their own unique characteristics. The saw-toothed chip morphology is of great interest since the understanding of the saw-toothed chip morphology and its evolution in machining helps unveil hard machining chip formation mechanisms as well as facilitate hard machining implementation into industry. In this study, the effect of tool wear and cutting conditions on the saw-toothed chip morphology was examined in machining 52100 hardened 52100 bearing steel. It was found that the chip dimensional values and segmentation frequency were affected by tool wear and cutting conditions while the chip segmentation angles were approximately constant under different tool wear and cutting conditions. The shear band spacing has also been predicted at the same order of magnitude as the measurement, and improved spacing modeling accuracy is expected if the cutting process information can be better predicted first.     

高速切削技术研究

高速切削是继数控技术之后,给机械制造业带来又一次革命性变化的一项高新技术。本文从机床、刀具、工件、工艺等方面讨论了高速切削的技术开发情况。     

多传感器刀具状态监控系统

介绍一个多传感器、多特征量的刀具状态监控系统。以声发射、功率监控和改进的神经网络技术，借助刀具监控软件，识别刀具切削工作的正常和失效状态。软件有信号采集、特征提取、网络训练回忆以及监控等功能，可实现离线和在线监控。并以离线控制试验为实例，考核该系统识别刀具状态的可靠性。     

刀具涂层技术及涂层刀具切削性能的试验研究

在阐述刀具硬质涂层技术发展新动向的基础上,通过车削、铣削及攻丝的切削试验证明:涂层刀具的切削力总比未涂层刀具的小,且不同涂层刀具的切削力减小程度不同,在试验的几种涂层刀具中,AlTiN涂层、TiCN-WS2涂层刀具的切削力减小得多些.     

高速切削加工工艺系统剖析

通过对与高速切削加工密切相关的工艺系统各要素的分析，指出高速加工机床、工具、夹具的要求与特点，以及高速切削加工对加工对象的适应性，从而为高速切削加工技术的合理选择、应用提供了决策依据。     

三坐标刀具数控磨削加工系统的研究

介绍一种三坐标刀具数控磨削加工系统 ,该系统具有在线编程、刀具测量和自动对刀功能 ,适用于圆柱类铣刀、圆锥类铣刀、铰刀、钻头、成型刀具的数控磨削加工。