圆盘剪剪切钢板不平行度分析及对策

针对圆盘剪剪切镰刀弯问题,分析影响剪切平行度的主要因素,通过剪刃同步更换,优化调整剪刃垂直与水平刀缝,提高圆盘剪自动定位精度等措施,提高钢板镰刀弯控制水平。     

斜刃月牙剪冲裁分析与研究

利用Ansys ls-dyna软件,建立了某酸洗-连轧机组的斜刃月牙剪冲裁模型;分析了不同剪切工艺参数下的剪切力峰值的分布规律;讨论了上、下剪刃不同磨损、剪刃侧向间隙、带材厚度对剪切力的影响;结合理论公式验证了模型的合理性;拟合得到了冲裁力公式。分析结果表明,剪刃侧向间隙δ取(0.3±0.1)mm或为(1/30～1/15)h(h为带材厚度)时,剪切表面质量较好;在不考虑剪刃磨损下,剪切工艺范围内带材的最大剪切力在35 kN左右。研究结果为优化剪切工艺参数、分析剪刃寿命以及详细结构优化设计和电气调试提供了理论参考。     

四剪刃圆盘剪控制系统及剪刃调整角度计算推导研究

介绍了四剪刃圆盘剪的工艺布置、控制系统配置及控制系统流程,对控制系统内剪刃调整角度参数进行了计算公式推导,对同类圆盘剪的控制系统设计具有良好的借鉴意义。     

基于LS—DYNA的分条圆盘剪剪切力的计算研究

通过对分条圆盘剪剪切力计算公式的讨论,按实际生产需求设计了圆盘剪三维模型。利用LS—DYNA,建立铜板分条圆盘剪的有限元模型,进行非线性计算研究,获得了铜板剪切过程中的应力一应变状态、剪切力。与理论公式计算结果对比分析,肯定了铜板分条剪切模拟中应力一应变分布与塑性变形的准确性,得到的剪切力变化曲线,较好地反应分条圆盘剪剪切过程中剪切力的变化规律,文章采用的有限元动力学分析可以为薄板分条圆盘剪的设计与实际生产提供了理论支持。     

圆盘剪和滚切式定尺剪的剪切缺陷及如何提高其剪切质量

目前,我国中厚钢板年总产量约1000万t,拥有26套左右中板厚轧机,其设备技术改造已基本完成,但剪切过程中依旧使用50年代的斜刀剪,影响剪切效率和质量。圆盘剪和滚切式剪都是近年来刚起步的剪切方式,自然会存有剪切缺陷。对此,本文则以中厚板生产过程中圆盘剪和滚切式定尺剪的剪切缺陷为重点,并探讨其提高剪切质量的解决措施,以供参考。     

圆盘剪和滚切式定尺剪的剪切缺陷及如何提高其剪切质量

目前，我国中厚钢板年总产量约i000万t，拥有26套左右中厚板轧机，其设备技术改造已基本完成，但剪切过程中依旧使用50年代的斜刀剪．影响剪切效率和质量。圆盘剪和滚切式剪都是近年来刚起步的剪切方式，自然会存有剪切缺陷。对此，本文则以中厚板生产过程中圆盘剪和滚切式定尺剪的剪切缺陷为重点，并探讨其提高剪切质量的解决措施，以供参考。     

关于300t冷剪机切钢压扁问题的探讨

通过对钢材冷剪过程中剪刃及钢材受力情况、剪刃几何形状及强度的分析，找到了钢材剪切中压扁问题产生的原因，提出了剪刃改进方案。     

3500mm中厚板上切铡刀式切头剪

针对以往中板轧机切头剪切口质量差、离合器磨擦片更换困难，无法快速更换剪刃等缺点，进行了设计创新和改进。使切铡刀式切头剪的剪切能力具有了国内领先水平。     

剪刃侧隙对飞剪剪切断面质量影响的有限元分析

采用有限元软件DEFORM-2D建立滚筒式飞剪剪切过程的二维动态有限元分析模型,研究了剪刃侧隙对滚筒式飞剪剪切断面质量的影响.仿真结果表明:剪切断面形状随着剪刃侧隙的变化而变化;同时不同板厚对剪刃侧隙要求也不同,总体趋势是随着轧件厚度的增加,要得到良好剪切断面质量所需要的剪刃侧隙也要相应增加.     

切边圆盘剪设计与调试

基于切边圆盘剪的基本结构和工作原理,介绍了某连续热处理生产线圆盘剪刀盘参数确定、剪切力计算、剪切功率确定、结构型式改进和生产参数优化.实践证明,该圆盘剪很好地满足了连续热处理生产线带材厚度和宽度跨度大的要求.     

热带钢连轧生产线的辅助设备切头飞剪

介绍滚筒式切头飞剪设备组成、结构特点及用途。     

Development of diagnosis system for knife and strip cutting face in the side trimming process

It is very important to measure and diagnose the state of knife and strip cutting face in real time in the side trimming process due to improvement of quality of strip trimming face. In this study, a diagnosis system for knife and strip cutting face was developed. Two CCD cameras facing each other are mounted at the delivery side (the entry of the bur masher roll) of the side trimmer. This system offers the operator the diagnosis result of state of knife and strip cutting face. With the help of the developed system, the knife breakage has been detected 100% and bad quality of trimming face is significantly decreased. Using CCD cameras, an on-line diagnosis system which can determine knife breakage and bad quality of trimming face in real time is developed in trimming. A diagnosis algorithm determining the state of the strip cutting face is also developed by calculating characteristic values and image processing based on the images of the strip cutting face obtained from CCD camera.     

拉深、翻边、切边和冲底孔复合模具设计

根据零件的结构特点及技术要求,围绕如何降低生产成本、提高工作效率和简化模具结构,通过比较多种工艺方案,采用线切割进行剪料,以定位板进行定位,确定了由拉深、翻边、切边和冲底孔等工序组成的冲压工艺方案,并对其所有工序进行了工艺计算;同时,设计了1副拉深、翻边、切边和冲底孔复合模具。结果表明,采用此工艺方案和模具结构显著提高了盒形零件的生产效率和产品质量。     

MZ208内圆磨床改造

MZ208原为内圆磨床,现将修整器进行改造,增加砂轮两端面修整回转臂,实现砂轮外圆和两端面的修整在一个修整器上完成,达到圆柱滚子轴承外圈滚道及两挡边一次磨削的目的。     

冷轧滚筒式飞剪介绍及维护要点

通过分析飞剪的典型结构,介绍了飞剪工作原理以及冷轧飞剪的应用概况和特点,经实践总结了飞剪的检修维护要点,该经验对飞剪检修有较大的参考作用。     

三轴传动滚切式双边剪的设计特点

阐述了滚切式双边剪的高精度、高效率等优点,并着重对其自主设计的三轴三偏心滚切式双边剪的结构特点及工作原理做了详细论述     

新型锥齿轮锻件切边模研制

锥齿轮锻件原切边模结构不尽合理,模块刃口加工方法落后,模具寿命低、切边质量差.提出新型切边模结构和刃口齿形设计计算公式,论述模具制造工艺、模块翻新和模具系列化方案.新型模具克服了原模具的缺点,显著提高了锻件切边质量和模具寿命,降低了模具成本.     

A quality control method by ultrasonic vibration energy and diagnosis system at trimming process

In this paper, the characteristics in mechanical properties of ultrasonic cold forging treatment (UCFT) used for the trimming knife and the effects of ultrasonic vibration energy (UVE) into the trimming process on the state of the strip cutting face were studied. And a diagnosis system to quality control for trimming knife and strip cutting face was developed and installed in plant. By the plant application of UCFT, service life of knife was more increased over 100% than that of conventional knife and using the developed diagnosis system, the knife breakage and saw ear have been perfectly detected and quality control of trimming face is effectively obtained.     

变截面智能压电梁的动态特性研究

建立变截面智能压电梁的动态模型,分析表面粘贴压电元件的均质梁的固有频率。在分析时考虑坟电元件、粘贴层、梁的剪切变形和转动惯量。研究表明,压电元件的刚度和惯量对梁的频率影响很大,变截面智能压电梁的一除非 固有频率总是高于等截面梁的固有频率。粘结层剪切 对一阶频率影响较 剪切变 转动惯量时,对梁的高阶频率影响较大。考虑梁的惊动国惯量和剪切谱形时,智能阶梯梁的频率比没有时的要低。     

Transverse shear and rotary inertia effects on the stability analysis of functionally graded shells under combined static and periodic axial loadings

The effect of transverse shear and rotary inertias on the dynamic stability of functionally graded cylindrical shells subjected to combined static and periodic axial forces is investigated in this paper. Material properties of functionally graded cylindrical shells are considered temperature-dependent and are graded in the thickness direction according to a power-law distribution in terms of the volume fractions of the constituents. Numerical results for silicon nitride-nickel cylindrical shells are presented based on two different methods: the first-order shear deformation theory (FSDT) which considers the transverse shear strains and the rotary inertias, and the classical shell theory (CST). The results obtained show that the effect of transverse shear and rotary inertias on the dynamic stability of functionally graded cylindrical shells subjected to combined static and periodic axial forces is dependent on the shell’s material composition, environmental temperature, amplitude of static load, deformation mode, and the shell’s geometry parameters.