冷轧带肋钢筋直径与拉丝机卷筒直径的匹配

采用被动式工艺生产冷轧带肋钢筋须经过减径、成型两台轧机连续轧制．要求钢材的秒流量相等，否则将造成断线停产或线材在拉丝机卷筒上打滑，致使卷筒严重磨损．用双层卷筒拉丝机提供动力生产冷轧带肋钢筋时，线材直径与卷筒直径的匹配是在一个小的调整范围，通过轧机拉力控制在一定范围变化，可保证成品尺寸符合公差要求而不产生打滑，从而避免了卷筒严重磨损．     

The Einstein relation in nanostructured materials: simplified theory and suggestion for experimental determination

An attempt is made to study the Einstein relation for the diffusivity–mobility ratio (DMR) in quantum wells (QWs) and quantum well wires (QWWs) of tetragonal compounds on the basis of a newly formulated electron energy spectrum taking into account the combined influences of the anisotropies in effective electron mass, the spin–orbit splitting, and the presence of crystal field splitting, respectively. The results for quantum-confined III–V compounds form a special case of our generalized analysis. The DMR has also been studied for QWs and QWWs of II–VI and IV–VI materials. Taking QWs and QWWs of CdGeAs₂, InAs, CdS and PbSe as examples, it was found that the DMR increases with increasing carrier statistics and decreasing film thickness respectively in various oscillatory manners emphasizing the influence of dimensional quantizations and the energy band constants in different cases. An experimental method of determining the DMR in nanostructures with arbitrary dispersion laws has also been suggested and the present simplified analysis is in agreement with the suggested relationship. The well-known results for nanostructures with parabolic energy bands have also been obtained as special cases from this generalized analysis under certain limiting conditions.     

Shallow hydrogen-induced donor in monocrystalline silicon and quantum wires

Electrical and optical properties of bistable shallow donors in monocrystalline silicon, which are introduced by proton implantation followed by annealing at 450 °C, have been studied. The temperature dependences of equilibrium and non-equilibrium carrier concentration and relaxation kinetics were investigated. IR absorption lines of bistable shallow donor electronic excitations were detected. The obtained experimental data demonstrate that the bistable shallow donors can be identified as quantum wire defect nanoclusters.     

尼龙护套电线印字缺陷的分析及改进的措施

阐述了尼龙护套电线印字过程中,经常出现的几种缺陷,并对这些缺陷产生的原因进行了分析,尤其对印字拖印问题,进行了详细和深入的分析,并提出了一系列的改进措施。     

人工智能在冷轧带肋钢筋工艺参数优化中的应用

论述了人工智能在冷轧带肋钢筋工艺参数优化中的应用,首先利用神经网络建立起冷轧带肋钢筋工艺参数与产品抗拉强度之间关系的数学模型,然后用遗传算法对工艺参数优化。按优化后的工艺参数在某拉丝加工厂进行了大批量生产试验,产品的合格率达到98%以上,从而为控制冷轧带肋钢筋工艺参数提供了一条行之有效的途径。     

Drawing of square twisted wire

The shape of the deformation zone during drawing of square twisted wires is described in this paper. The condition of the stable deformation of the wire is formulated. This condition is satisfied by the constant value of the pitch of the helical surface of the die. The work focuses on the investigation of the influence of the die cone angle on the drawing parameters, in particular on the drawing stress.     

TANDEM双丝焊在造船拼板焊接中的应用

介绍了TANDEM双丝焊在造船拼板焊接中的原理、应用、工艺结果表明,TANDEM焊接工艺对组对时预留间隙、母材种类的适应性较强,热输入低,变形小,减少焊后处理成本,焊接效率高、焊接速度快.TANDEM焊接工艺是船厂拼板焊接比较理想的焊接工艺.     

Effect of fretting amplitudes on fretting wear behavior of steel wires in coal mines

Given that fretting wear causes failure in steel wires, we carried out tangential fretting wear tests of steel wires on a self-made fretting wear test rig under contact loads of 9 and 29 N and fretting amplitudes ranging from 5 to 180 μm. We observed morphologies of fretted steel wire surfaces on an S-3000N scanning electron microscope in order to analyze fretting wear mecha-nisms. The results show that the fretting regime of steel wires transforms from partial slip regime into mixed fretting regime and gross slip regime with an increase in fretting amplitudes under a given contact load. In partial slip regime, the friction coefficient has a relatively low value. Four stages can be defined in mixed fretting and gross slip regimes. The fretting wear of steel wires in-creases obviously with increases in fretting amplitudes. Fretting scars present a typical morphology of annularity, showing slight damage in partial slip regime. However, wear clearly increases in mixed fretting regime where wear mechanism is a combination of plastic deformation, abrasive wear and oxidative wear. In gross slip regime, more severe degradation is present than in the other regimes. The main fretting wear mechanisms of steel wires are abrasive wear, surface fatigue and friction oxidation.     

基于ANN+GA冷轧带肋钢筋工艺参数的优化设计

运用人工神经网络技术和遗传算法模拟，分析了冷轧带肋钢筋的力学性能与工艺参数之间的非线性非显式多目标多变量的函数映射关系，创新地提出了多目标函数优化问题的单目标化思想和多目标函数中各分目标的均优理念，从而有效地实现了复杂工程技术问题的优化设计，得出冷轧带肋钢筋的合理生产工艺参数。     

光器件金线图像高光区域的检测与去除

针对视觉检测过程中光器件金线表面出现的高光现象,提出一种光器件金线图像高光区域的检测与去除方法。首先,根据采集的金线图像进行特征分析,利用OTSU算法分割高光区域;其次,调用MATLAB中的bwareaopen()函数删除小面积对象,即高光闭合区域,并通过图像的差值运算提取高光区域图像;最后,采用八邻域像素平均值的方法更新高光区域像素值,该方法既可以去除高光区域,又可以保证此区域像素值在图像中的均衡分布。通过仿真实验结果分析,验证了金线图像高光区域检测与去除方法的有效性和可行性,同时为后续金线的质量检测提供有力保障。