罐头封口理论及方法

本文从力学、材料学、成形理论多方面论述了金属罐头的封口原理与方法。从应用角度分析了封口机构的工作特点及应注意的问题。并对未来技术进行了预测与展望。     

Multi-scale roughness transfer in cold metal rolling

We report on a comparative Atomic Force Microscope (AFM) multi-scale roughness analysis of cold rolled Al alloy and steel roll, in order to characterize the roughness transfer from the steel roll to the workpiece in cold strip rolling processes. More than three orders of length-scale magnitudes were investigated from 100 microns to 50 nanometers on both types of surfaces. The analysis reveals that both types of surfaces are anisotropic self-affine surfaces. Transverse and longitudinal height profiles exhibit a different roughness exponent (Hurst exponent) ζ=0.93±0.03 and ζ=0.5±0.05 Different length-scale cut-offs are obtained in each direction l^sup=50μm, l^sup>100μm. Height and slope distributions are also computed to complement this study. The above mentionned self-affine characteresitics are found to be very similar for the roll and the strip surfaces, which suggest that roughness transfer takes place from the macroscopic (100 μm) to the very small scale (50 nm).     

弹流润滑状态测试仪的研制及其应用

在深入研究文氏桥电路的基础上研制了ＥＨＬ－Ｃ型润滑状态测试仪。文中阐述了仪器的特点，给出测试所需标定曲线的绘制过程。最终通过高速滚动轴承的测试分析，证明了仪器的可行性，具有推广的价值。     

基于键合图的轧机机座系统垂向振动研究

应用键合图理论建立了轧机机座系统垂直振动键合图模型,获得了系统的固有频率和主振型。对系统在各阶模态下的能量分布进行了计算和比较,确定了系统的危险模态。分析了轧制力随时间变化的6种工况下的系统响应。此外通过有限元法对系统的固有特性进行了研究,计算发现系统的键合图模型与有限元模型具有很好的一致性。研究结果对于实际生产和系统垂振问题的识别与解决具有指导作用。     

气-液两相泡状流在摇摆状态下的摩擦压降计算

在常温下对光滑的有机玻璃管内单相水和气-液两相泡状流在两种不同摇摆角度和3种不同摇摆周期下的摩擦压降特性展开了研究.结合实验数据,提出了摇摆状态下的单相水摩阻系数的计算关系式.计算关系式不仅能够反映摩阻系数随时问变化的周期动态特征,而且计算结果与实验结果符合很好.在此基础上,运用均相流模型,对摇摆状态下两相泡状流的摩擦压降进行计算.结果发现,计算值与实验值的相对误差在±25%以内.     

基于共振解调与神经网络的滚动轴承故障智能诊断

介绍了一种基于共振解调与神经网络技术的滚动轴承故障诊断方法。对采集系统所拾取的滚动轴承振动信号进行共振解调处理，依据故障包络频谱中必然存在谐波谱线的规律，在共振解调后的包络信号中提取所需的轴承故障谱线特征信息，并将其作为神经网络输入，利用神经网络进行轴承各种故障状态的识别，实现滚动轴承故障的智能诊断。实验表明，该方法能准确而有效地识别出滚动轴承的不同磨损状态，诊断便捷。     

中板厂钢坯氧割渣在线清除系统的制作及应用

介绍了柳钢中板厂钢坯氧割渣的在线清除系统的组成及其生产性能。     

Microstructure and press formability of a cross-rolled magnesium alloy sheet

Cross-rolling, in which the roll axis is tilted by 7.5° towards the TD-direction, was carried out on a commercial magnesium alloy. The (0002) texture intensity of the cross-rolled specimen was lower than that of the unidirectionally rolled specimen, and the (0002) texture of the cross-rolled specimen was inclined about 10° towards the TD-direction. Also, the grain size of the cross-rolled specimen was smaller than that of the unidirectionally rolled specimen. As a result of the Erichsen tests at 433-493 K, the press formability of the cross-rolled specimen was higher than that of the unidirectionally rolled specimen. The high formability of the cross-rolled specimen is attributed to both the modification of (0002) texture and the enhancement of grain refinement by the cross-rolling.     

变频器在压延和挤出机上的应用

简述中国能源情况和政府对节能降耗的要求，介绍了当前在大型万能四辊压延机的使用情况及改造更新的必要性。着重介绍采用变频器代换直流电机及实施方案。     

A Process of Notch Wavy Rolling for Strengthening Metal Sheets

Wavy roll design was employed for strengthening 1 mm thin austenitic stainless steel coil sheet by cold rolling without further reduction in thickness. This steel possesses high corrosion resistance and high ductility. Initially, the sheets were rolled into sine wave shape (wave amplitude <2 mm) and then flattened using conventional cold rolling mill. Such a process cycle was repeated for four times successfully and the mechanical properties were measured after each cycle. The yield strength increased from 255 to 931 MPa with corresponding decrease in elongation from 45% to only 17% after the fourth cycle of severe cold working. Tensile strength and hardness values increased from 753 MPa and 185 HV to 973 MPa and 371 HV, respectively. The micro-to-nano-scale resolution structures, obtained by optical and atomic force microscope (AFM), were used to explain the variation in properties during this manufacturing process and to propose schematically the deformation mechanism.