450t冷摆剪的研制

介绍了450 t冷摆剪新设备,冷摆剪的功能,主要技术参数及结构特点.     

薄板坯连铸摆剪顶剪故障分析与对策

以薄板坯连铸摆剪的设备组成及工作原理为基础,从摆剪循环剪切、框架摆动、压下辊、水平辊的控制功能四个方面,对摆剪顶剪故障的原因进行了分析,并采取了改进对策。     

薄板坯连铸摆剪顶剪刃故障分析与对策

摘要：以薄板坯连铸摆剪的设备组成及工作原理为基础,从摆剪循环剪切、框架摆动、压下辊、水平辊的控制功能四个方面,对摆剪顶剪刃故障的原因进行了分析,并采取改进对策。     

交-直-交变频器在CSP连铸机中的应用

本文主要介绍了交-直-交变频器的功能及其在薄板坯生产中的具体应用。通过对摆剪传送辊和铸流夹送辊电机控制方式的具体分析,总结出变频器控制方式的选用原则。另外根据现场的实际使用情况,对变频器的产生各种干扰的原因进行了分析。通过增加各种抗干扰措施优化了设备的运行环境。     

双偏心轴定尺剪切机

目前,剪切小型钢材多用单偏心轴剪盒式定尺剪切机,如图1所示。其结构简单, 在摆杆滑槽内,下剪刃固定在摆杆下端,为了保证有足够的冲剪力,上剪刃的行程应较大,为保证工件剪切时,走钢线高度变化较小,摆杆长度应足够长,摆杆的起始后摆位置可以控制,进而可以控制上下剪刃的轨迹,由于摆     

CSP取样剪改进设计

为满足某钢厂CSP取样剪剪切厚度变化的需求,对取样剪的剪切机构和传动形式进行了改进,提高了取样剪的剪切厚度,延长了设备使用寿命,保证了设备的良好运行。     

曲柄式飞剪剪刃运行轨迹分析

利用曲柄转角与摇杆的摆角之间的关系,给出2050曲柄式飞剪剪切机构曲柄的特殊位置,进一步绘制剪刃的运行轨迹(连杆曲线),与用解析法绘出的剪刃运行轨迹吻合。证明该解析方法是正确的,对了解飞剪的运动关系及保养、维护有一定的益处。     

本钢薄板坯连铸摆剪主电机变频系统优化

主要对本钢薄板坯连铸摆剪变频系统的构成及工作原理进行了介绍,对生产过程中出现的问题,进行了详细的分析,针对这些问题提出了摆剪变频系统优化方案并进行了实施。     

摆架滑道间隙对摆剪强度影响的瞬态动力学分析

通过瞬态动力学分析上刀架在摆架滑道中的不同间隙对摆剪强度和摆架滑道变形的影响,得出在许可范围内间隙为0.3 mm的时候对摆剪强度以及对摆架滑道变形量影响最小。并且分析间隙在0.3 mm时摆架滑道的应力变化情况,其应力最大值不会造成摆架滑道的损坏。最后通过在企业的实际测量验证了分析的合理性,为企业生产提供理论依据。     

摆式剪运动和受力分析

对摆式剪的运动和受力进行了详细分析,阐明了摆式剪运动和受力之间的关系,确定了摆式剪曲轴正确的旋转方向,有助于提高设备运行的稳定性和延长使用寿命。     

The correlation of microstructural development and thermal stability of mechanically alloyed multicomponent Fe-Co-Ni-Zr-B alloys

The microstructural evolution of multicomponent Fe_70-x-yCo_xNi_yZr₁₀B₂₀ (x = 0, 7, 21; y = 7, 14, 21, 28) alloys during mechanical alloying (MA) has been studied using XRD, SEM and TEM. Mixtures of elemental and pre-alloyed powders have been transformed initially into the single supersaturated bcc α-Fe solid solution phase for the alloys investigated. Subsequently, an amorphous phase has been obtained in Co-free alloys and Co-containing alloys with high Ni/Co ratios of 1 and 3. However, no amorphous phase was detected in another Co-containing alloy with a lower Ni/Co ratio (e.g. 0.33). The thermal stability of the as-milled powders has been investigated by a combination of DSC and the Pendulum magnetometer experiments. The DSC studies provide information on the thermodynamics and kinetics of crystallization of amorphous structure as a function of alloying contents. The Pendulum magnetometer studies reveal the phase transformation from nanocrystalline bcc α-Fe solid solution to amorphous structure during MA and the thermomagnetization behavior of the as-milled powder.     

Serrated Flow Model for Metallic Glasses under Compressive Loading

A rheological model is proposed that incorporates the serrated flow nature of metallic glasses. It involves the process of the nucleation, propagation and the arrest of a shear bands in the samples subjected to compressive deformation at room temperature. Numerical resolution of the constitutive equations resulting from the model is compared with the stress-strain curve obtained from in-situ nano-compression test in SEM of Zrbased metallic glass. Parametric identification method was applied and enabled us to release the physical parameters of the model. The obtained results showed that the model is adequately valid to describe the experimental data and the almost adjustable model parameters are physically meaningful and comparable to literature.     

自由梁在中点受到质量块撞击的剪切效应

剪切失效是强动载荷作用下结构失效的重要模式.着重研究了自由梁在中点受到质量块撞击后的剪切效应,给出了发生剪切失效的无量纲判据.分析表明,在初始速度的间断界面上是否发生剪切失效取决于质量块无量纲初始动能、质量比及梁的无量纲厚度.     

直线一级倒立摆系统控制仿真及实验研究

倒立摆是一个非线性、不稳定的系统,控制情况比较复杂,在航空航天,军工领域,机器人等智能控制方面有所应用。倒立摆也是检验新控制算法的理想实验平台。阐述了直线一级倒立摆系统的组成和工作原理。首先根据直线一级倒立摆的物理模型,经过力学分析和近似处理等方法变为数学模型,随后分别使用PID和Fuzzy模糊控制方法,在MATLAB/Simulink中搭建合理的仿真模块,进行相关仿真分析。对比两种控制算法对倒立摆系统稳摆的控制结果,找出控制效果最好的控制方案,并分析不同算法的特点。最后使用直线一级倒立摆实物进行实时控制实验,以验证仿真的结果是否和实际结果相符。     

大型阀体锻造的一种省力成形新工艺

针对电站锅炉用大型截止阀阀体的制造 ,提出了“剪切挤压”新工艺 ,并利用模拟实验和工艺实验的方法对剪挤工艺进行研究 ,通过 DN1 0 0大型 1 2 Cr Mo V合金钢截止阀阀体在较低吨位压力机上成功地锻造 ,进一步验证此工艺的可行性和优越性。另外 ,此工艺还可用于大型闸阀阀体、三通管等枝杈类零件的制造。     

Shear Band Formation During Sheet Forming

Shear bands grow across the dimensions of deforming sheet during some sheet forming and most metal separation operations. Their formation accelerates failute and determines its location in the sheet. Examined is shear band development during plane strain extension using both experimental observations and geometric models. Many factors are reviewed which combined to create the specific conditions required for shear band formation.     

含低速冲击损伤复合材料层合板的压缩失效

通过含低速冲击损伤的两种平面编织复合材料层合板（G803／5224、G827／5224层合板）的压缩试验,研究了低速冲击损伤对复合材料层合板失效行为的影响。试验后采用超声c扫描检测、外观检查与断口侧面宏观观察方法对损伤与失效特征进行了对比分析。结果表明,两种含低速冲击损伤层合板被压缩时,G803／5224层合板冲击背面首先发生子层微屈曲,微屈曲沿着垂直于压缩方向扩展,最后剪切分层失效;G827／5224层合板冲击背面首先发生子层屈曲分层,屈曲分层也是沿着垂直于压缩方向扩展,最后剪切屈曲失效。两种层合板低速冲击后压缩的失效模式与光滑板压缩失效模式基本相同。     

The formation of PSB-like shear bands in cyclically deformed ultrafine grained copper processed by ECAP

Cyclic deformation was performed on ultrafine grained copper processed by ECAP. Shear bands (SBs) and adjacent microstructures were investigated using electron channeling contrast in scanning electron microscope. The possible formation mechanism of SB was discussed based on the characteristic distribution of defects introduced by ECAP.     

Development of shear wave acoustic emission transducers

Shear wave transducers, which have the characteristic of polarization, have been developed for acoustic emission. The effects of the centre frequency, the geometrical dimensions of the shear wave elements as well as the matching network on the features of the transducers are discussed. Using these shear wave transducers in localized AE monitoring, disturbances from other directions can be reduced and the S/N ratio can be increased.