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本文介绍了一种新的滚压工具,其结构简单,通用性强,一种工具可加工多种不同孔径的工件,并可加工至盲孔孔底,而不需要退刀槽。由于有色金属磨削困难,因此这种滚压工具对有色金属的加工更具有特殊意义。 相似文献
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The USA Environmental Protection Agency has issued a regulation prohibiting the use of nitrite in any cutting fluid containing a triethanolamine salt of a tricarboxylic acid. This is the first time that the Agency has placed any restriction on the composition of cutting fluids. The authors comment on the regulation and review the literature concerning nitrosamines as they pertain to cutting fluids. 相似文献
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综合考虑了轧辊弹性变形与轧件弹塑性变形,运用影响函数法进行热轧带钢轧制力计算,采用VC++9.0应用程序编写了轧制力计算软件,同时建立了四辊轧机轧制过程的三维有限元模型,对比验证了此轧制力计算模型的正确性。 相似文献
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曲轴作为典型的非均质结构零件,尺寸过渡处存在应力集中。研究和实践表明,曲轴的疲劳破坏大多发生在曲柄与主轴颈、连杆轴颈的过渡圆角处。为了提高其抗疲劳强度必须对曲轴的这些部位实施滚压强化工艺。结合曲轴圆角滚压强化和校直系统,对德国Hegenscheidt圆角滚压校直机床的原理、滚压工艺以及滚压校直过程中滚压力的变化进行研究.并对滚压力异常进行分析。 相似文献
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Through co-oligomerisation of alphaolefins with alkylmethacrylates, fluids are obtained with a unique chemical combination of non-polar PAO and polar ester oil in one molecule. The polarity of these co-oligomers between P A 0 on the one hand and ester oil on the other helps to avoid the typical disadvantages of these common synthetic base oils. Thus, co-oligomers offer superior solvency for DI packages, neutral elastomer behaviour, the hydrolytic stability of sterically hindered esters, a thermal and oxidative stability close to PAO, and free miscibility with mineral oil and synthetic base stocks. Co-oligomers are Newtonian fluids of high purity and with a viscosity range between 50 and 600 mm2/s at 100°C. Both viscosity level and purity open up a range of applications. Even without high molecular weight VI improver, gear oils, and hydraulic oils with outstanding viscometric performance can be formulated. The purity has a positive influence on properties such as demulsibility, de-aeration, and foaming behaviour. The present paper compares co-oligomers with common base fluids and gives examples of typical applications. 相似文献
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滚动轴承对滚动体的技术要求 总被引:1,自引:0,他引:1
滚动轴承的精度、性能和寿命,在很大程度上取决于滚动体的技术质量水平。从轴承的基本要求出发,对滚动体在尺寸规格、公差等级、力学性能、疲劳寿命、振动噪声等方面如何满足其适用性进行了概括,同时对国产滚动体的技术质量水平现状进行了评述。 相似文献
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The rationale is presented for the development of 315 °C bulk oil high-temperature hydraulic fluids for future US Air Force systems. Four chemical classes of candidate fluids worthy of consideration are described along with their relative merits and limitations. The four fluids are: mineral oil based MIL-H- 27601A, a synthetic hydrogenated polyalphaolefin, a synthetic silahydrocarbon (tetra alkyl silane), and a linear perjluoropolyalkylether. Questions for consideration in selecting a candidate high-temperature hydraulic fluid are presented and discussed in relation to the intended specific application. 相似文献
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针对莱钢1 500热连轧终轧温度控制精度低的现状,对机架间冷却水控制系统进行了研究与改造。首先对电动调节阀进行重新测试,然后对机架间冷却数学模型和终轧温度控制的实际应用进行了深入的理论研究。在基础自动化控制系统的改造中,增加了分档式反馈控制和前馈控制;同时在过程自动化控制系统中对预设定计算模块进行了优化。经过现场一年多的运行,改造后的系统大大提高了带钢终轧温度的控制精度和带钢成品的质量,具有很好的应用价值。 相似文献
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