共查询到19条相似文献,搜索用时 109 毫秒
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运用程序分析法对镀锌钢板生产流程进行了分析,删除了多余工序,调整了工艺;并结合布置和经路分析重新布置了加工设备,使加工路线缩短,生产周期减少23%,提高了生产率。 相似文献
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曲轴动平衡是曲轴生产过程中的关键工序之一,也是自动平衡校正技术的轿车制造业的一个典型应用,对于提高产品质量有着重要意义,本文从动平衡的工作原理,基本结构和应用实践几个方面作了较全面和详细的介绍。 相似文献
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代贵斌 《理化检验(物理分册)》2002,38(6):259-262
采用光镜、扫描电镜、透射电镜对240曲轴断裂原因进行了分析。轴颈圆角未强化和加工粗糙是导致曲轴断裂的主要原因;轴颈圆角处锻造纤维露头是疲劳的诱发因素。估算了曲轴的运行周次,提出了改进措施。 相似文献
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曲轴是发动机的关键零件,其性能的好坏直接影响发动机质量和寿命。介绍曲轴材料、工艺流程、关键加工工艺及加工注意事项,对曲轴生产项目的开发具有一定的参考和借鉴价值。 相似文献
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三轮摩托车在行驶过程中经常出现曲轴断裂现象,影响了客户的使用安全及企业的声誉.采用有限元软件,对三轮摩托车发动机的曲轴进行静力分析,找到了曲轴应力最大的部位,这与实际断裂的情况吻合.对曲轴产生最大应力部位的结构参数进行改进,并对曲轴材料进行了调整,取得了较满意的结果. 相似文献
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王江 《中国新技术新产品》2012,(20):137
曲轴是重要的机械传动机构,有限元更是常用的分析方法,但边界条件有不贴切不准确之处,经过研究对比,将曲轴附属的结构考虑进来,并采用多点约束施加约束及载荷,能更简洁、准确的模拟工况,得到更好的分析结果。 相似文献
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引入运输周转量叠加累计的方法,将物流运输成本量化运用于总图方案比较中。通过换算后的平均运输距离来分析高阶段总平面布置方案的合理性,继而调整整体布局和运输距离,优化方案,实现总图与运输的完美统一;同时,也增强方案实施的可行性,赢得市场。 相似文献
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We present a procedure of studying the fatigue strength of crankshafts of a two-cylinder motorcycle engine. The use of a unique loading scheme provided obtaining patterns of in-service fracture of the tested crankshafts. The results of comparative fatigue tests of some series of crankshafts of various design and technological versions, namely, nonhardened crankshafts with a fillet and hardened and nonhardened crankshafts without a fillet (zero fillet) are given and analyzed. 相似文献
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根据高纯度茄尼醇生产项目的建设与技改情况,应用程序分析法优化茄尼醇精制工艺.结果表明,优化后的工艺能降低制造成本,减小劳动强度,提高生产率. 相似文献
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Failure Analysis of a Vehicle Engine Crankshaft 总被引:1,自引:0,他引:1
An investigation of a damaged crankshaft from a horizontal, six-cylinder, in-line diesel engine of a public bus was conducted
after several failure cases were reported by the bus company. All crankshafts were made from forged and nitrided steel. Each
crankshaft was sent for grinding, after a life of approximately 300,000 km of service, as requested by the engine manufacturer.
After grinding and assembling in the engine, some crankshafts lasted barely 15,000 km before serious fractures took place.
Few other crankshafts demonstrated higher lives. Several vital components were damaged as a result of crankshaft failures.
It was then decided to send the crankshafts for laboratory investigation to determine the cause of failure. The depth of the
nitrided layer near fracture locations in the crankshaft, particularly at the fillet region where cracks were initiated, was
determined by scanning electron microscope (SEM) equipped with electron-dispersive X-ray analysis (EDAX). Microhardness gradient
through the nitrided layer close to fracture, surface hardness, and macrohardness at the journals were all measured. Fractographic
analysis indicated that fatigue was the dominant mechanism of failure of the crankshaft. The partial absence of the nitrided
layer in the fillet region, due to over-grinding, caused a decrease in the fatigue strength which, in turn, led to crack initiation
and propagation, and eventually premature fracture. Signs of crankshaft misalignment during installation were also suspected
as a possible cause of failure. In order to prevent fillet fatigue failure, final grinding should be done carefully and the
grinding amount must be controlled to avoid substantial removal of the nitrided layer. Crankshaft alignment during assembly
and proper bearing selection should be done carefully. 相似文献
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快速重组制造系统的构建原理及其应用 总被引:19,自引:2,他引:17
快速重组制造系统是一种适应21世纪全球化市场竞争的新型制造系统。提出了基于组态式柔性制造单元组成的陈列式布局的快速重组制造系统的创新结构体系,建立了以生产效益为该系统方案设计和运行决策目标的随机模型,应用排队网络模型和静态马尔科夫工件运送方式得出系统重组时缓冲区容量的优化配置和最优工件运送策略的算法,研制了作为构建快速重组制造系统核心的新颖的组态式柔性制造单元的原型,并给出生产工程中应用所创建的阵列式可重组制造系统的成功案例。 相似文献
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孙浩 《理化检验(物理分册)》2015,51(6)
某空压机曲轴在运行约5 000h后发生断裂失效,通过宏观检验、断口分析、金相检验以及硬度测试等方法,对空压机曲轴断裂原因进行了分析。结果表明:由于曲轴中存在严重的疏松缺陷,在运行过程中于曲轴轴颈和轴拐R过渡表面疏松处萌生裂纹,在交变应力作用下,裂纹以疲劳方式扩展直至曲轴断裂失效。 相似文献