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目前,铁路运输正朝着重载与快捷两大方向发展,重载快捷铁路货车应运而生。为了适应重载快捷铁路货车研发、试制及批量制造的要求,必须进一步提高铁路货车模具技术。研究表明,传统铁路货车模具设计技术完成了从人工计算与手工绘图到二维AUTOCAD绘图的升级,进而到三维CAD软件设计、CAE软件分析的升级;最新铁路货车模具设计技术主要包括,CAD技术、CAE技术、工艺设计一体化技术、数据共享技术;传统铁路货车模具制造技术完成了从车铣刨磨镗钻到CAM技术的升级;最新铁路货车模具制造技术主要包括,高速5轴加工技术、车铣复合加工技术、木塑型快速制造技术、激光打标技术。另外,概述了模具材料、模具热处理、模具安全保护、模具管理等模具技术。 相似文献
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随着国民经济的发展,铁路运输仍在我国货物运输业中扮演着主要角色,一度被视为夕阳行业的铁路车辆制造业仍保持了持续稳定的增长。运输业除了向铁路货车制造厂家提出了提质、提速的要求外,中小批量的特种车、出口车也时有订单。货车的市场份额已由宏观调控走向自主争取,传统大厂三分天下的局面逐步演变为群雄逐鹿的格局。铁路货车制造业正面临着国内乃至全球性的商业竞争,能否在日益严峻的挑战中生存下去,除了在经营管理模式上有所突破外,关键在于是否掌握了先进技术。因此,在十五规划期间,铁路货车制造厂家都正处在传统技术的改造… 相似文献
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牵引杆是我国铁路货车急待开发的无间隙牵引装置中重要部件之一,着重介绍其生产工艺、各种参数的选取,以及如何保证尺寸精度、内部密实度、机械性能等各种指标而采取的各项工艺措施;为批量生产牵引杆做好前期准备。 相似文献
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剖析车型开发串行工程中模具制造环节的弊端 ,提出模具制造必须参与汽车开发的并行工程 ,然后重点论述了模具制造行业如何应用并行工程解决方案。 相似文献
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为了获得更好的压铸模具寿命,有必要研究模具损坏的主要原因。模具失效主要是由于裂纹和冲蚀,保证工具钢的耐热性使其具有良好的高温强度,高温韧性和热传导性是关键。对热作模具钢进行了热疲劳性,热导率、横向冲击韧性及组织热疲劳裂纹的数据比较,选择正确的热作工具钢能大幅度提高模具寿命。结果表明,正确选择压铸模用钢,能提高模具的产品质量和延长使用寿命,且生产效率高、经济效益好。 相似文献
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《International Journal of Cast Metals Research》2013,26(1-4):256-259
AbstractIn this study, the carbon steel boll mould that has merit of the metal mould and the sand mould was produced. Steel balls were heated and joined to produce the steel ball mould. The compressive strength was measured for the strength of the mould. The compression specimen was manufactured after putting steel balls into the carbon vessel and heating to join. The compression specimen was 10 mm in diameter and about 10 mm in height. The influence of the diameter of the steel ball and temperature of heating on the strength of the steel ball mould was examined. The compressive strength decreased as the ball diameter became large. Steel balls were oxidised and joined by heating. Melted aluminium was cast into the carbon steel ball mould. The macrostructure of the solidified specimen was observed. 相似文献
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《International Journal of Cast Metals Research》2013,26(4):177-190
AbstractBurn-on and penetration defects in steel casting are principally caused by localised overheating of the sand mould or cores. Such overheating can cause liquid metal to compromise the mould surface and entrain onto the surface of the mould. A method has been developed to predict likely burn-on and penetration defect locations as part of a standard casting simulation. The method relies on determining, from simulation results, the locations where the mould is above a certain critical temperature. The critical temperature is generally above the temperature at which the steel is fully solidified. By measuring the time periods during which these locations in the mould are above the critical temperature, burn-on and penetration defects can be predicted. The method is validated through comparison with previous experimental data. Several parametric studies are conducted to investigate the sensitivity of the predictions to the choice of the critical temperature, the interfacial heat transfer coefficient between the steel and the mould, the pouring temperature, and the mould material. The results of one case study are presented where burn-on or penetration defects observed on a production steel casting are successfully predicted. 相似文献
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并行式绿色设计的研究 总被引:4,自引:0,他引:4
林朝平 《组合机床与自动化加工技术》2003,(12):43-44
为改进传统的串行式设计方法,提出机电产品开发中应用并行式绿色设计方法,以缩短产品开发周期,提高质量,降低成本,减少污染,保护环境,开发绿色产品。 相似文献
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根据湍流理论及异形坯连铸的特点, 建立了异形坯结晶器三维流场数学模型, 对不同条件下的流场进行了数值模拟, 分析了水口结构和工艺参数变化时异形坯结晶器内涡心深度的变化规律及液面湍动能的分布状态. 结果表明 采用上倾式水口, 水口夹角为120°, 拉速为0.9m/s时, 结晶器内流场分布较为合理, 液面较稳定. 模拟结果与水模实验结果吻合较好. 该模型可对连铸过程进行离线分析, 确定最佳参数, 并可作为在线控制模型的基础. 相似文献