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介绍了普通机床机械安全的现状,分析了造成现状的主要原因;阐述了机械安全的涵义;介绍了普通机床机械安全的通用标准要求,结合检验实践中的一些实例,给出了普通机床常见的机械安全结构问题:最后提出了提高机床机械安全的预防措施与建议。 相似文献
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High speed milling experiments using nitrogen-oil-mist as the cutting medium were carried out to investigate the characteristics of chip formation for Ti-6Al-4V alloy.Within the range of conditions employed(cutting speed,vc=190-300 m/min;cutting depth of axial,ap=5,7 mm),saw-tooth chips were produced in these experiments.During the macro and micro analysis of the Ti-6Al-4V chips,an optical microscope and a scanning electron microscope(SEM)were used to study the microstructure and the morphology of the chips,and the X-ray photoelectron spectroscopy(XPS)was employed for chemical analysis.Comparisons were made to study the influence of different cutting media(nitrogen-oil-mist,air-oil-mist and dry cutting condition)on chip formation.Results indicate that cutting media have significant effects on chip formation.Nitrogen-oil-mist is more suitable for improving the contact condition at chip-tool interface and increasing the tool life in high speed milling of Ti-6Al-4V alloy than air-oil-mist and dry cutting. 相似文献
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纸浆模塑四棱台状单元最大载荷与主要结构参数的关系研究 总被引:1,自引:0,他引:1
本研究在采用ANSYS/LS-DYNA有限元软件,利用计算机模拟结构单元静态压缩试验的基础上,结合试验设计和数据分析理论,得到了影响纸浆模塑四棱台状结构单元最大载荷的主要结构参数,以及它们之间的数学模型,对进一步探讨纸浆模塑缓冲衬垫设计方法有着重要的意义. 相似文献