共查询到19条相似文献,搜索用时 125 毫秒
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铸铁型材在机械制造业中的应用及前景 总被引:2,自引:0,他引:2
扼要地阐述了国内外铸铁型材的发展状况。结合目前我国机械制造业及金属加工业使用铸铁型材的需要,对水平连铸铸铁型材的组织及性能特点进行了分析讨论。指出我国铸铁型材的生产及推广使用前景 相似文献
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0前言铸铁型材水平连续铸造设备及工艺成套技术是国家“七五”科技攻关项目,于1990年通过原机械工业部科技成果鉴定和国家验收,其成果达到80年代国际先进水平,它标志着我国已掌握了水平连续铸造铸铁型材的生产技术,用它生产的铸铁型材达到国际同类产品的质量水平,获机械工业部科技成果一等奖和国家科技成果二等奖,被原机械工业部列为“九五”重点推广项目。1铸铁型材在我国的推广应用概况从1991年起,由我国自行设计的水平连续铸造生产线开始投放市场,先后在山西、河北、河南、辽宁、江苏、南京及西安等地建成八条铸铁型… 相似文献
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铸铁型材水平连续铸造设备及工艺成套技术是国家“七五”科技攻关项目,于1990年通过原机械工业部科技成果鉴定和国家验收,其成果达到80年代国际先进水平,它标志着我国已掌握了水平连续铸造铸铁型材的生产技术,用它生产的铸铁型材达到国际同类产品的质量水平,获... 相似文献
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ZSL—02型铸铁水平连铸生产线 总被引:3,自引:1,他引:2
从1958年出现铸铁水平连铸型材[1];到70年代,该技术在发达国家已非常完善。产品有各类等截面的铸铁型材,材质有灰铁、球铁及各种合金铸铁[2,3]我国从1985年组织攻关,1987年研制出ZSL-01型生产线。该机型年产量1000t,可生产φ40~φ150mm的贺截面灰铁和球铁型材。在此基础上,西安理工大学于1992年再次研制了ZSL—02型连铸生产线,该机实现了全线半自动化,年产量为2000t,可生产φ40~φ250mm圆形及非圆形等截面的铸铁型材[4]。至今,国内已有7家企业安装了该机型生产线。图1为ZSL—02型铸铁型材生产示意图。经冲天炉熔炼的… 相似文献
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用连铸法生产组织致密的铸铁空心型材 总被引:2,自引:0,他引:2
应用垂直上拉连铸法生产出了不同壁厚和管径的铸铁空心型材,并对获得的铸铁空心型材进行了金相观测和力学性能的测试.结果表明:应用该连铸法能获得组织致密、晶粒细小和综合力学性能优良的铸铁空心型材. 相似文献
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通过铸铁水平连铸对比试验,研究了铸铁水平连铸过程中结晶器内铁水的对流流动状态及重力偏析等造成铸铁型材沿型材断面力学性能的不均匀性.结果表明, 采用合适的工艺措施可以促进离析现象,并细化组织,有助于提高水平连铸铸铁型材断面力学性能的均匀性. 相似文献
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为寻找能相对反映用覆砂铁型生产的制动鼓铸件性能的单铸试棒,用同一炉次铁液浇注湿型粘土砂型单铸试棒和覆砂铁型铸件本体,进行抗拉强度对比试验,结果表明:将单铸试棒的开箱时间定在15min,并在出炉时增加浮硅孕育,其抗拉强度与本体抗拉强度最大差值仅为13MPa,说明用湿型砂单铸试棒来检测控制制动鼓的性能是可行的。 相似文献
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报导了纯铁浮区熔化过程中杂质碳、氧的行为。电解铁经真空感应熔炼和真空铸锭后,制成直径为10毫米的试样。当区域熔化时,熔区下的试样以3.5—22转/分的速度旋转,而熔区自下而上地以1—2毫米/分的速度沿试样移动。试样经过11次区域熔化。 根据碳的分布系数的测定和区熔前后试样中夹杂物的金相鉴定,讨论了区域熔化法去除铁中碳、氧杂质的可能性。 相似文献
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ZHU Xianhua DONG Zengzhang SU Junyi Xi''''an Jiaotong University Xi''''an China 《金属学报(英文版)》1990,3(12):384-390
The solidification process of a horizontally continuously cast gray iron bar of 4.6cm in diame-ter was modelled.The function describing the distribution of heat flux at the internal surfaceof graphite sleeve,which was equal to that on the surface of the iron bar,was inversely derivedusing numerical calculation from the temperature distribution in the sleeve measured in realproduction.By using the distribution of heat flux as a boundary condition on the surface of theiron bar,the numerical simulation on solidification of the iron bar taking longitudinal heatconduction into account was made.The profile of solidification front obtained from the numer-ical simulation was approximately coincident with that in real production.In addition,thequantitative relationships of the thickness of solidified shell at the exit of the mold to the maintechnological parameters,including the temperature of liquid iron at the entrance of the mold,the moving speed of the bar and the intensity of water cooling,were obtained from the numeri-cal simulation. 相似文献
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《International Journal of Cast Metals Research》2013,26(1-4):81-85
AbstractAlthough it is known that the addition of bismuth refines the graphite nodule in spheroidal graphite cast iron, the refinement mechanism has not yet been clarified. In this research, the effect of bismuth on the refinement has been investigated by examining the microstructure of the spheroidal graphite cast iron containing a small amount of bismuth. Bismuth was added at 0˙01 mass% to the spheroidal graphite cast iron melt containing 3˙5–3˙7 mass% carbon and 2˙0– 2˙8 mass% silicon, then the melt was poured into the mould to obtain the stepped test bar with 2, 3, 5 and 10 mm thicknesses. The graphite nodule increased as the bismuth content increased. The diameter of the graphite nodule decreased as the thickness decreased, namely, as the cooling rate increased. The graphite nodule was further refined by the addition of bismuth. The increase in silicon content increased the graphite nodule count and the ferrite in the matrix. It postulated that bismuth exists as simple substance or a compound in the vicinity of the nucleus of the graphite. 相似文献
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AbstractInoculants for cast irons are usually materials containing silicon. It is important to an understanding of the mechanism of inoculation to establish the effectiveness of silicon in this role. When grey iron is inoculated with a bar of pure silicon, the region near the bar is inoculated while that further away is not affected. Although pure silicon has been found to be an active agent in the inoculation of cast iron, the phenomena of fading is so rapid that the element's inoculating effects were hardly recognised in some former experiments. 相似文献