烧结机台车与风箱的密封

论述了烧结机抽风系统中台车与风箱的密封.通过设计创新和采用四新技术,降低设备的漏风率,得出大型烧结机密封装置可以节耗降能的方法.     

360 M2烧结台车中间体的铸造工艺设计及生产实践

根据360M^2烧结机台车中间体的结构特点和技术要求，设计合理的型砂混制、造型、铁液熔炼及球化孕育处理等工艺，生产实践证明，采用金属模具替代木摸，以树脂砂替代粘土砂，并采用合理的浇冒口系统和球化孕育处理工艺，铸造360M^2烧结机台车中间体取得成功。     

烧结机台车车体加工线

烧结机上有数十台至上百台台车,例如130米~2的烧结机就有129台台车。且台车的重量占烧结机本体重量的45～55%。由于台车的生产批量大,加工工序多,因此,要占用镗、铣、刨、钻等机床的大量台时,并且加工件往返跨越车间,造成加工效率低,质量差,不能满足生产要求。四金工车间革命职工在党支部领导下,高举“鞍钢宪法”的伟大红旗,大搞技术革新,群策群力,自制了结构简单,操作方便的专用设备,制造成了按工序定床加工流水作业线,使产量和质量都大大提高。月产量由原来的几十台增加     

130m~2摆架式烧结机的运动和受力分析

本文介绍摆架式烧结机烧结台车位移、速度、压力角与星轮转角关系的公式推导和计算,摆架系统和尾部弯道上的台车,对下部台车列产生的压力和上抬力矩分析计算。可供台车起拱原因分析及烧结机设计、改进参考。     

改进型烧结台车

冶金工业部马鞍山钢铁设计研究院与江苏省江都冶金机械修造厂合作,针对我国钢铁行业烧结机普遍使用老式台车,存在着使用寿命短、备件消耗量大及漏风率高等问题,在消化吸收国外大型烧结机先进技术的基础     

球墨铸铁整体台车试验情况

台车是烧结机很重要的组成部分,它直接经受装料、点火、抽风烧结直至仉尾卸料,完成烧结作业。它又是价格很贵的易损部件,以机尾为弯道式的75米~2烧结机为例,其费用接近整个烧结机的一半。为什么台车的费用这样贵呢?因为一台烧结机需用很多台车,例如75米~2烧结机的台车数量是80个,台车的本体用ZG35B铸钢制成,而且是由两半体     

新型烧结机炉篦条的铸造

针对现有炉篦条较复杂的生产工艺、较高的成本问题,设计了炉篦条的新型结构及其制造工艺。结果表明:所采用的新生产工艺改善了铸造工艺性,降低了生产成本,同时获得良好的综合性能,避免炉篦条崩塌散落造成烧结机台车车底镂空。     

130m~2摆架式烧结机台车起拱原因分析及试验研究

本文通过对130m~2摆架式烧结机的运动和受力分析,提出了影响烧结台车起拱的原因以及诸原因对起拱影响的大小,并用试验验证了理论分析结果。可供该类烧结机设计人员参考。     

摆架式烧结机星轮齿廓曲线探讨

本文主要讨论摆架式烧结机星轮齿廓曲线设计,着重介绍一种新的齿廓曲线推导和设计方法。该种齿廓曲线星轮推移台车时,既可满足运动要求,又能增大压力角,且恒定不变,有利于防止台车起拱,可供该类烧结机星轮齿形设计时参考。     

烧结机尾部星轮阻力矩装置的研究

回车道台车起拱是带式烧结机中普遍存在的问题，过去曾有不少人对此进行过理论探讨，但未能得到很好的解决。作者提出在烧结机尾部星轮轴上设置一液压阻力矩装置的构思，通过试验证明完全能够消除过剩力矩，从而减少甚至消除由于烧结机尾部台车推力过大而引起的起拱现象。     

球墨铸铁烧结台车本体的铸造

介绍了在高海拔地区利用本地资源生产铸态高强度球墨铸铁烧结台车本体的生产工艺，以及在生产过程中采取的工艺改进措施     

烧结方式对Mo烧结品质的影响

以JDC产Mo粉末为原料,初步探讨了不同烧结方式对Mo烧结品质的影响.研究结果表明,电阻烧结坯整体平均密度要高于中频烧结坯密度.中频烧结条件下C元素含量低、O元素含量高,而电阻烧结条件下C元素含量高、O元素含量低.中频烧结坯中部的显微组织孔洞数量明显高于烧结坯上部和下部,而电阻烧结坯上部显微组织孔洞数量明显高于其它部位,这与密度检测结果一致.Mo烧结坯杂质相主要存在晶内孔洞和晶界.晶内孔洞杂质相为Mo的氧化物,中频烧结下晶界杂质为少量单质碳和较为复杂的金属氧化物,而电阻烧结下晶界杂质主要为单质碳和少量金属氧化物.     

Nano-attached tungsten particle synthesis and sintering behaviors

The reduction of sintering temperatures in industrial processes is advantageous for both energy efficiency and material properties in powder metallurgy. Based on the well-known size effects of nano-particles on sintering processes, nano-particles were intentionally used as a homogeneous sintering activator for micro-particles in this study. Two kinds of tungsten bimodal feedstocks which consisted of nano-particles and microparticles were prepared and sintered by spark plasma sintering processed. Even at the low sintering temperature of 1,250 °C and the short sintering time of 300 sec, relatively high densities could be achieved. Depending on the content of the nano-particles in the charged feedstock, the sintered body exhibited different morphological features. Density, field emission scanning electron microscopy, transmission electron microscope was used for analysis.     

Effect of Preparation Technology Parameters on the Restriction Performances of Unitary Titanium Porous Restrictor

Unitary titanium porous restrictor was prepared by a sintering welding technique. The results indicated that the restriction performance of unitary Ti porous restrictor was not only dependent on the morphology and particle size of the original powder, but also influenced by the molding pressure, sintering temperature and sintering pressure. The restrictor obtained from titanium powder with large particle size or spherical morphology possesses big porosity, large pore size and high permeability but low restr...     

大型烧结机机尾电除尘器改造

介绍了宝钢一期烧结机机尾214 m2电除尘器的改造项目及结果,为今后大型电除尘器的改造提供了范例.     

影响无压烧结小直径金刚石锯片性能的主要因素分析

以锋利度及寿命为指标,通过单因素试验,考察了烧结温度、保温时间、金刚石浓度、粒度对ф112 mm锯片性能的影响。结果表明:影响锯片性能的因素从大到小依次为:烧结温度、金刚石粒度、金刚石浓度、保温时间;当烧结温度为930℃,金刚石粒度为35/40,金刚石浓度为12%,保温时间为60 min时,ф112 mm锯片的性能最优。      

Influence of preparation process on sintering behavior and mechanical properties of ultrafine grained Ti（C, N）-based cermets

The influences of forming and sintering processes on distortion, cracking as well as mechanical properties of sintered bodies of ultrafine grained Ti（C, N）-based cermets were investigated. The results show that lubricant is indispensable to fabrication of ultrafine Ti（C, N）-based cermets, however, with low binder content in powder mixture, the lubrication action of paraffin is attenuated. A appropriate level of 2% （mass fraction） paraffin is determined for a cermet with binder content of 36% （mass fraction）. It is also found that the influence of compaction pressure on distortion and cracking of sintered bodies presents a complex relationship. A relatively lower or higher compaction pressure, less than 100 MPa and more than 400 MPa respectively, favors uniform density distribution in green compact. The heating rate of sintering should be strictly controlled. Too fast heating rate results in enclosed pores to burst and forms large size pores in sintering body. A heating rate of 3 ℃/min is recommended.     

影响多孔钨孔隙度的因素

研究了粉末粒度,压制压力及烧结温度等对多孔钨孔隙度的影响,结果表明,对同一粒度粉末压坯,孔隙随着压制压力的增大而减少;在相同压力下,粗粉压坯的孔隙度小于细粉压坯的孔隙度。当烧结温度和烧结时间相同时,细粉多孔钨的孔隙度要小于粗粉多孔钨的孔隙度,对同粒度粉末,压坯孔隙度随烧结温度升高而减小。     

置氢TC21钛合金粉末模压成形烧结组织性能研究

采用置氢TC21钛合金粉末模压成形+保护气氛烧结工艺,研究置氢TC21钛合金粉末模压成形-烧结合金的组织性能的变化规律.结果表明:置氢量0.22%(质量分数,下同)和0.39%的TC21粉末烧结体组织较细,致密化程度也较高,置氢量0.39%的TC21粉末烧结体退火后的抗压强度和屈服强度最高.随着置氢量的增加,置氢TC21钛合金粉末模压成形烧结体片层组织尺寸变薄、针状的组织变细,晶粒尺寸变小;置氢TC21钛合金粉末模压成形烧结体退火后组织较退火前发生了明显的均匀化和细化;烧结体真空退火后氢含量达到安全状态,其中,置氢量0.39%的TC21钛合金粉末烧结体致密效果较好、综合力学性能较高.     

Thermal residual stress of polycrystalline diamond compacts

Thermal residual stresses in polycrystalline diamond compact(PDC)cutter arising from the difference in thermal expansion between the polycrystalline diamond(PCD)and the supporting tungsten carbide substrate after sintering at high pressure and high temperature were investigated using finite element simulation,laboratory tests and theoretical analysis.The obtained results show that although compressive residual stresses exist both in the interface of PCD table and in the most region of PCD table surface, the...