Ultra-large aluminum shape casting:Opportunities and challenges

Ultra-large aluminum shape castings have been increasingly used in automotive vehicles,particularly in electric vehicles for light-weighting and vehicle manufacturing cost reduction.As most of them are structural components subject to both quasi-static,dynamic and cyclic loading,the quality and quantifiable performance of the ultra-large aluminum shape castings is critical to their success in both design and manufacturing.This paper briefly reviews some application examples of ultra-large aluminum castings in automotive industry and outlines their advantages and benefits.Factors affecting quality,microstructure and mechanical properties of ultra-large aluminum castings are evaluated and discussed as aluminum shape casting processing is very complex and often involves many competing mechanisms,multi-physics phenomena,and potentially large uncertainties that significantly influence the casting quality and performance.Metallurgical analysis and mechanical property assessment of an ultra-large aluminum shape casting are presented.Challenges are highlighted and suggestions are made for robust design and manufacturing of ultra-large aluminum castings.

导管架平台上部组块双船拆除

为研究复杂海域环境中海洋平台双船拆除方法的安全性与可操作性,采用水动力数值计算与水池模型试验相结合的方法进行研究。将双船水动力耦合计算与水池模型试验进行对比,在相对理想海况下,结合与实际工况接近的规则波作用,进行驳船水动力性能变化与运动响应的幅值分析。在受力分析方面,对甲板耦合装置进行改良设计,对比试验数据与数值计算数据,得到受力在合理范围内的结论。研究内容为实际施工的合理性提出一定的指导性意见。

为什么加薪后,员工的积极性还是不高?

背信弃义的店长 这是我曾经服务过的一家眼镜连锁企业，公司发展10多年，老板是个热情豪爽的人，10多年间公司发展很快，在我任职阶段已经有了几十家的直营店。老板给我讲过这样一件事，曾经有一位店长，是老板手把手带出来的。他的理想报酬是：薪资＋提成＋年终，每年有十几万，在我们这个行业里待遇算是比较优厚的了。去年的时候因为店长父亲病重，老板陆续以个人名义借了几万元给他应急，他自然是非常感动。然而春节过后回来上班的第一天，店长就提出了辞职，辞职后自己开起了眼镜店，成为了企业的竞争对手。