成形砂轮修整技术研究现状

介绍了修整成形砂轮常用的金刚石笔修整、金刚石滚轮修整、GC杯形砂轮修整、点挤压修整、电加工修整方法的整形原理和特点。并分析了目前成形砂轮修整中存在的问题及发展趋势。     

基于修整力的树脂结合剂金刚石砂轮机械修整

研究了树脂结合剂金刚石砂轮修整过程中修整力与修整效果的关系,基于修整力的变化表征了砂轮的表面形貌及磨削性能。首先,对碳化硼、碳化硅、白刚玉3种砂轮修整工具进行实验,并采集了修整过程中修整力的变化;然后,利用白光干涉仪观测修整后砂轮的表面形貌;最后,对修整后砂轮进行磨削验证实验,得到不同修整工具修整后砂轮的磨削性能。基于上述实验,分析并验证了修整力的变化与砂轮表面形貌和砂轮磨削性能的关系。结果表明,法向力Fn能够表征砂轮的磨粒切削刃密度以及磨粒突出高度;修整比率β反映了砂轮的锋锐程度,当β稳定时,砂轮达到充分修整。因此修整力反映了砂轮表面形貌和磨削性能,根据修整力的变化可以把握砂轮的修整进程。     

金属结合剂金刚石砂轮的电解修整研究

本文系统地论述了金属结合剂金刚石砂轮的电解修整新工艺的电解修整原理、修整方法、修整参数、修整机床等。     

超硬磨料砂轮修锐技术最新进展

介绍了电解在线修整法、在线电火花放电修整法、激光修整法、软弹性修整法和游离磨粒修整法等最新的超硬磨料修整技术。     

砂轮圆弧数控修整研究

介绍了传统手工方法修整砂轮的不足,阐述了数控砂轮修整器圆弧修整原理,通过合理选择砂轮修整参数和修形方式可提高砂轮表面修整质量,达到砂轮端面直角边圆弧修整的目的。     

基于金刚石微粉烧结棒的超硬砂轮修整试验研究

对金刚石微粉烧结棒修整树脂结合剂金刚石砂轮进行了试验研究。以反映砂轮平面度的端面跳动和径向跳动作为修整效率的评价依据 ,通过试验对比了主轴转速、砂轮组织参数和修整棒进给速度对砂轮修整效率的影响 ,认为低主轴转速下修整棒对金刚石砂轮的修整效率较高、砂轮参数对修整效率的影响很小以及修整棒进给速度与修整效率呈非线性关系     

曲轴机加工砂轮修整精度及参数优化研究

该文针对砂轮修整后砂轮尺寸精度存在误差、砂轮修整参数未标准化等问题进行研究。通过分析砂轮修整过程，识别出回弹量与磨损比这两个影响修整精度的关键因素。设计试验验证了线速比、修整次数及进给量对修整后砂轮表面状态的影响，并调整优化修整参数，实现了修整后砂轮尺寸精度的提升以及曲轴加工表面粗糙度合格率的提升，减少了工件报废率，节约了成本，对于磨床加工中的砂轮修整过程具有重要的参考价值。     

金属基金刚石砂轮修整技术的研究进展

本文介绍了电火花修整、杯形修整、软弹性修整、激光修整及在线电解修整等金属基金刚石砂轮的修整技术和近年来国内外的研究进展。阐述了金属基金刚石砂轮修整技术的关键、需解决的问题，提出了进一步研究的内容。     

航空发动机叶片磨削用超硬磨料砂轮修整技术及装置研制

比较了几种常用的砂轮修整方法,针对叶片磨削用砂轮的特点,选取磨削法进行修整。对修整方法进行了研究并开发了相应的砂轮修整装置。     

单点金刚石修整笔的现状分析及发展趋势

针对单点金刚石修整笔的应用现状,阐述了单点金刚石修整笔修整基本原理,重点介绍了单点金刚石修整笔种类、制造精度以及先进制造对高档修整笔的需求。最后,对单点金刚石修整笔的未来发展方向进行了展望。     

Mechanics of roll edge contact in cold rolling of thin strip

Simulation of cold rolling of thin strip due to roll edge contact with oil lubrication was performed successfully using a developed influence function method. Roll edge contact and related surface roughness was discussed in this paper. The calculated rolling force, intermediate force and work roll edge contact force increase significantly when the reduction increases. The strip profile becomes poor with a higher reduction, and the calculated rolling forces are consistent with the measured values. A modified edge shape of work roll determined from the roll edge contact length and roll edge flattening value is helpful to reduce the work roll edge wear and to extend the work roll life. Surface roughness and asperity of the rolled strip are characterized by surface profilometer and atomic force microscope. The research shows that the surface roughness reduces with a higher reduction or rolling speed. The effect of the strip width on surface roughness is not significant.     

复杂断面型钢辊弯成形数值模拟

以结构分析有限条法为基础,引用固体力学有限形变理论的更新拉格朗日法（Updated-Lagrange法）,建立了弹塑性大变形样条有限条模型,并将其用于模拟一种复杂断面型钢多道次辊弯成形全过程。分析了带材的变形特点,获得了带材变形空间曲面形状,以及纵向薄膜应变和应力分布。算例表明,变形带材的角部和边缘部位是变形剧烈区域,带材上靠近轧辊前部位出现纵向拉应变峰值。沿变形带材宽度方向,离带材中心线越远变形越剧烈。     

冷轧板形测量值计算模型的研究与应用

为了得到准确的板形测量值,通过分析板形辊的结构与板形测量原理,制定板形测量信号的标定及滤波处理方法。为了补偿带钢横向厚差对板形测量的影响,建立轧后带钢横向厚度分布模型,把各个测量段处的带钢厚度引入张应力分布计算模型中,提高了带钢张应力分布计算的精度。根据带钢与板形辊的接触状态设定带钢边部板形测量值的补偿计算模型,用于修正未被带钢边部全部覆盖的传感器所测径向力。针对轧制过程中板形辊上某些传感器会出现故障的情况,制定故障测量段的插值计算方法。给出由各测量段板形测量值向若干个特征点处板形值的转换模型,简化板形控制系统中的数据处理过程。板形测量值计算模型已用于1450冷连轧机的板形控制系统改造中,经现场应用表明,模型具有较高的精度,为冷轧板带生产实现精确的板形控制提供条件。     

20辊轧机轧件截面形状与边部减薄预报软件开发

利用接触元双坐标法（CEM）建立了双AS—U—Roll系统森吉米尔轧机轧制过程中轧件及辊系变形行为的CEM函数矩阵,并开发了SM4SM软件。该软件能够很好地预报各种轧制条件下轧件截面形状、轧件边部减薄、轧制力、轧辊挠曲等功能。文中应用SM4SM,分析了第一中间辊锥角、锥度长度和窜辊长度对轧件截面形状和轧件边部减薄控制的影响。研究结果对冷轧过程控制轧件板形和边部减薄具有重要的参考价值。     

Analysis of friction and surface roughness effects on edge crack evolution of thin strip during cold rolling

Experimental investigation and mechanical analysis have been carried out to study the edge crack formation during cold strip rolling using Atomic Force Microscopy (AFM) and Scanning Electron Microscopy (SEM). The effects of friction and surface roughness on edge crack initiation and growth rate have been discussed. Friction leads to an increase in fracture loads and decreasing the friction coefficient is effective in preventing the microcracks. Surface roughness variation along the strip width contributes to stress distribution and inhibits crack nucleation. The findings reveal that the behaviour of crack evolution is influenced by fracture surface roughness as well as rolling friction.     

A low cost 3D shape measurement method based on a strip shifting pattern

We present a simple, low cost but fast 3D shape measurement method. There is no limitation on the object's material and texture. We use a projector to project a strip shifting pattern on the object, and a digital camera to record videos of the scene. The distortion of the strip shadow on the object is used to get the object's 3D information. A novel space-time edge finding method is introduced to position the shadow edge accurately. This edge finding method overcomes the effect of inter-reflection and high light. Using this space-time information, we can calculate the pixels' 3D coordinates. To get the 3D shape of an object with black texture, we improve the black strip pattern to a 3-color strip pattern. The bad data are filtered by a post-processing 3D filter, which makes full use of the neighborhoods' geometric constraints and the view point constraint. Meanwhile, our measurement method is fast, regardless of the complexity of the shape.     

带材检测控制系统的设计

以单片机为核心,将光电线阵应用到带材的边缘位置及宽度检测,设计出数字带材检测控制系统,为解决生产过程中带材的跑偏及宽度测量等提供了一种方法。本系统具有精度高、漂移小,光敏元件的线性误差影响可忽略等优点,能应用于冷轧带钢厂、印染、造纸、胶片、磁带等其它工业生产部门。     

Edge stresses in wide strip hot rolling

In the rolling of wide strip, longitudinal tensile stresses develop along the edges which enhance edge cracking. Theoretical assessment of these stresses and the factors affecting their magnitude and spread are not emphasized in existing solutions, since most of the solutions are based on the assumption of plane strain along the entire width. In the present work a flowline field solution is developed to analyze the flow and stresses in steady state wide strip hot rolling based on the concept of a plane-strain middle zone and two lateral flow edge zones from which edge stresses and edge zones width have been determined. The results obtained show that the maximum value of the longitudinal edge stresses is 1/√3 the flow stress and occurs at the neutral point where the width of edge zone is maximum. The influence of the coefficient of friction at roll-strip interface, roll diameter and thickness reduction ratio on the magnitude and spread of edge stresses is not appreciable.     

新型四辊冷轧机工作辊双向移动技术

新型四辊冷轧机工作辊双向移动技术极大地提高了板形控制能力，降低了板带轧制过程中产生的边降，延长了轧辊使用周期，可广泛应用于板带轧制。     

球头立铣刀端刃前刀面的刃磨仿真

以Solidworks为开发平台,对球头立铣刀端刃前刀面的刃磨过程进行仿真.建立了一套铣刀端刃前刀面的虚拟加工系统,通过刃磨参数优化,可实现端刃前刀面与周刃前刀面的光滑连接和良好的"S"刃形.模拟仿真发现端刃前刀面有一个很窄的刃带,分析了砂轮姿态对刃带宽度的影响.