重型商用车减速器装配线工艺设计

为满足用户需求,东风德纳车桥有限公司新建一条高标准的重型商用车车桥减速器总成装配线。分析了重型商用车减速器总成的装配工艺。分析减速器总成装配过程工艺难点并提出解决方案。对主动锥齿轮及轴承座总成、从动锥齿轮差速器总成以及减速器合件总成装配工艺进行设计,并对主动锥齿轮及轴承座总成预紧力的准确性、主从动锥齿轮啮合印迹垫片选择的可靠性、连接螺栓扭矩控制的保障能力等进行有效地控制。使各装配线工艺布局合理、物流顺畅,降低了劳动强度和人工成本,保证了产品质量。     

13T差速器右壳夹具的设计改进

本文介绍13T后桥差速器右壳钻孔工序,原用摇臂钻床加工,不能柔性化生产,在设计该产品第30序钻孔工序的夹具过程中加以改进,适应多品种机械加工的要求。     

Experimental study on the liquid slug of cryogenic slug flow in inclined tubes

An experimental study was carried out to understand the phenomena of the boiling flow of liquid nitrogen in inclined tubes with closed bottom by using a high speed motion analyzer.The experimental tubes are 0.018 and 0.014 m inner diameter(ID) and 1.0 m in length.The range of the inclination angle is 45°-90° from the horizontal.The experimental observation on the liquid slug was carried out along the tubes.Statistical method was employed to analyze the experimental data.The experiment analyzed the influences of the inclination angle and the tube diameter on the liquid slug length and velocity.The results show the liquid slug propagation velocity increases with the decrease of inclination angle θ.For all cases,the maximum values of the mean liquid slug lengths were obtained at θ = 60°.The mean liquid slug lengths were greater for large tube at higher tube position.These conclusions provide a basis for further study liquid slug of cryogenic two-phase undeveloped slug flow.     

网络经济下的校办企业财务管理

分析网络经济对财务管理的冲击,论述网络经济下校办企业财务管理的显著变化,指出传统的高校企业财务管理模式已经跟不上网络经济的步伐,网络财务管理取代传统财务管理是一种必然发展趋势。     

跨国航运企业财务风险管理

借鉴国内外财务风险管理理论与实践中一些比较成熟的方法,结合我国航运企业财务风险管理的实际情况,对我国跨国航运企业财务风险管理中的资金筹集风险、资金管理风险等相关问题进行研究,并对跨国航运企业财务风险管理的内部环境建设提出建议。