某带钢连续热浸镀机组卧式连续退火炉水冷炉辊的开裂原因

采用宏观和微观形貌观察、化学成分分析、显微组织观察、硬度测试等方法,对某带钢连续热浸镀机组卧式连续退火炉水冷炉辊的开裂原因进行了分析。结果表明:水冷炉辊辊套成分中不含铌元素,镍元素含量偏低,导致组织中形成网状富铬碳化物析出相;辊套内腔结垢、水冷不畅使水冷炉辊产生局部过热,导致工作侧辊套基体中粒状合金碳化物的析出和网状富铬碳化物的长大,使工作侧辊套的脆性增加;随着结垢的沉积,水冷炉辊出现轴承转动不畅,甚至堵转现象;在热应力、扭力作用下,裂纹在网状富铬碳化物析出相中形成并沿网状碳化物逐渐向基体内扩展,最终导致水冷炉辊的开裂。     

高压辊磨+搅拌磨在某复杂难选铁矿石选别工艺中的优越性研究

为了验证在某复杂难选铁矿石的选矿工艺中，应用高压辊磨机和立式搅拌磨的优越性，进行了一系列对比试验。结果表明，与颚式破碎机相比，高压辊磨机产品的粉矿率更高，产品的可磨性更好；与球磨机相比，立式搅拌磨机细磨效率更高、效果更好，相同磨矿细度下，立式搅拌磨机磨矿产品的解离度更高，磁选铁精矿品位也更高；高压辊磨+立式搅拌磨在处理复杂难选铁矿石方面具有显著的优势。     

铝合金三角形波纹夹芯板对平头弹抗冲击特性数值模拟研究

为研究铝合金三角形波纹夹芯板对平头弹体的抗冲击性能及损伤特性，利用有限元软件ABAQUS/Explicit建立弹体冲击靶板的数值模拟模型，并结合实验验证了模型及其参数的有效性。基于数值计算结果，分析了三角形波纹夹芯板几何结构对其防护性能、失效模式和能量吸收的影响规律及机理，并与等面密度单层板进行对比分析，研究结果表明，靶体几何结构对其抗冲击性能存在影响，三角形波纹夹芯板抗冲击性能低于单层板抗冲击性能。此外，增加芯体拓扑结构夹角能显著提高三角形波纹夹芯板的抗冲击性能，并且靶板几何形状会对其失效模式及耗能特性存在影响。     

Drag Power Loss Investigation in Cylindrical Roller Bearings Using CFD Approach

In high-speed rolling element bearings, the drag forces can be prominent and it is demonstrated in this investigation that the classical models may not be appropriate for correctly estimating this power loss contribution. A modification of the models is thus proposed, including the usual drag forces formulation relying upon the drag coefficient to be evaluated from a numerical computational fluid dynamics (CFD) approach. A three-dimensional approach that considers both the rings and the cylinder ends seems the only adequate approach to be used because a two-dimensional approach predicts a drag coefficient value that is too low. When using the former computed drag coefficient for the evaluation of the total power losses, high values of oil volume fraction must be employed to recover the measured power losses.     

高温合金蜂窝成形制造工艺及性能评价

目的 研究高温合金蜂窝成形工艺参数优化规律。方法 采用辊压成形、整形和点焊工艺制备高温合金蜂窝芯体，并对成形后的蜂窝芯体进行性能表征及失效分析。研究辊压成形工艺、整形工艺和点焊工艺参数，对采用最优工艺参数得到的高温合金蜂窝芯体样件分别进行压缩、剪切性能测试，对样件进行性能表征及失效分析，得出其最大压缩力、平面压缩强度以及失效方式。结果 选取30 t压力时，校形效果良好；当焊接电流为500 A，焊接时间为0.005 s时，焊点质量最好。结论 采用优化后的工艺参数制得的样件尺寸精度和质量较高，能够为高温合金蜂窝制造提供指导。     

第二代高温辊式破碎机用辊轴的研究

根据傅里叶定律、牛顿冷却定律以及辊式破碎机辊轴的有关参数建立了辊轴的热传导模型,模拟计算了不同工况下的辊轴使用情况。在600℃工况温度时,辊轴采用风冷、使用40Cr材料可以安全使用;但在850℃工况温度时,辊轴材料需更换为0Cr18Ni9,或辊轴材料不变,冷却方式改用水冷,方可满足使用安全。     

New spraying process development for inlet deflector roller in a recoiling line

The inlet deflector rollers of a recoiling line are sprayed rollers. Short scratch lines have been found on the surface of steel sheets during commissioning. By adjusting the control parameters of the line and investigating the manufacturing process of inlet deflector rollers,the root cause of the scratches was found. By modifying the manufacturing process of the rollers,the scratches have been thoroughly eliminated,and quality steel sheets have been consistently produced in the recoiling line.     

煤矿用输送带阻燃试验摩擦滚筒冷却方式的研究和应用

阻燃是煤矿用输送带重要的指标,在进行输送带试验时,滚筒摩擦试验又是检验输送带阻燃的主要方法,由于滚筒摩擦试验的试验周期较长,所以研究通过风冷、水冷、冰冷几种方式冷却试验滚筒,缩短试验周期,提高工作的效率和准确性。     

辊磨液压系统选型及工况探讨

介绍了VRMR360.4辊磨的液压系统蓄能器的计算方法,对有杆腔蓄能器容积和无杆腔蓄能器容积进行了选型计算,通过分析不同的工况,选取合适的工作参数。     

Microstructure and mechanical behavior of Ti/Cu/Ti laminated composites produced by corrugated and flat rolling

Ti/Cu/Ti laminated composites were fabricated by corrugated rolling (CR) and flat rolling (FR) method. Microstructure and mechanical properties of CR and FR laminated composites were investigated by scanning electron microscopy, numerical simulation methods, peel and tensile examinations. The effect of CR and FR was comparatively analyzed. The results showed that the CR and FR laminated composites exhibited different effective plastic strain distributions of the Ti layer and Cu layer at the interface. The recrystallization texture, prismatic texture and pyramidal texture were developed in the Ti layer by CR, while the R-Goss texture and shear texture were developed in the Cu layer by CR. The typical deformation texture components were developed in the Ti layer and Cu layer of FR laminated composites. The CR laminated composites had higher bond strength, tensile strength and ductility.