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91.
介绍了高速线材轧机机组中,控冷辊道的工作情况和性能特点,并重点介绍了张紧装置在链轮、链条、集中传动中的实际应用。 相似文献
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Research on experiments and action mechanism with water vapor as coolant and lubricant in Green cutting 总被引:3,自引:0,他引:3
Junyan Liu Rongdi Han Yongfeng Sun 《International Journal of Machine Tools and Manufacture》2005,45(6):687-694
Green cutting has become focus of attention in ecological and environmental protection. Water vapor is cheap, pollution-free and eco-friendly. Therefore water vapor is a good and economical coolant and lubricant. Water vapor generator and vapor feeding system were developed to generate and feed water vapor. Comparative experiments were carried out in witch YT15 (P type in ISO) tool was used in cutting C45 steel under the conditions of compress air, oil water emulsion, water vapor as coolant and lubricant and dry cutting, respectively. The experimental results showed that with water vapor as coolant and lubricant the cutting force is further reduced, the friction coefficient, the chip deformation coefficient and the surface roughness value decreased and the cutting temperature lowered. Kinetic model of penetration capillary in tool–chip interface of cutting fluid revealed that the lubricity effect is much better with water vapor as coolant and lubricant because of its excellent penetration performance and forming of low shearing strength lubrication layer. Therefore, the use of water steam as coolant and lubricant proves to be a green cutting technique. 相似文献
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A detailed Loss of Coolant Accident (LOCA) analysis in an AP1000 NPP was performed, followed by a definition of the vulnerability analysis principles, and analysis of blast loads and fragments impact created by a nearby explosion. The AP1000 NPP performs excellently to small-break LOCA due to in-structure shock, with the 10 CFR 50.46 Acceptance Criteria fully accomplished. Impulsive dynamic loads resulting from blast waves and fragments impact of GBU-28 (Guided Bomb Unit) were considered for a nearby explosion. We model the structure and the main reactor components using the MSC/Dytran code to obtain accurate internal acceleration levels at critical points. We account for the appropriate blast wave interaction with the soil and the soil interaction with the containment structure, rather than using empirical formulas. The model includes the shielding structure with its concrete base, the support structures for the reactor, the steam generators, and the pressurizer. The combined effect of bomb fragmentation and blast loading was also considered using a cylindrical fragmentation model and the blast model of Kingery-Bulmash, assuming a hemispherical charge. A comprehensive risk assessment methodology composed of four phases was developed. The methodology is comprised of: (I) System analysis, (II) Hazard analysis, (III) Damage assessment, and (IV) Risk analysis of the in-structure shock consequences. Using seismic fragility curves for analysis of the expected failure modes according to explosion events faced difficulties since no published data was found. Adjustments to these fragility curves were made using median acceleration limits on components designed to withstand airplane crash, together with standard deviations taken from the given earthquake fragility tables. The findings reveal that the probabilities of failure of the reactor coolant system components resulting from a GBU-28 nearby hit, namely the pressurizer, the cooling pumps, and valves are quite high (greater than 1∙10−4). 相似文献
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S. Ebbrell N. H. Woolley Y. D. Tridimas D. R. Allanson W. B. Rowe 《International Journal of Machine Tools and Manufacture》2000,40(2):209
It is well known that a boundary layer of air is entrained around a rotating grinding wheel. The effects of the boundary layer have been under some scrutiny in recent years with most research being based on trying to overcome the boundary layer. The current investigation aims to show through experiment and modelling, the effects of the boundary layer on cutting fluid application and how it can be used to aid delivery by increasing flow rate beneath the wheel. Results from three experiments with different quantities of cutting fluid passing through the grinding zone are presented. 相似文献
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以二丁基亚磷酸、多元胺、甲醛、壬基酚聚氧乙烯醚、硼酸为原料合成BP ,以蓖麻油酸和三乙醇胺为原料合成OE ,并添加高效杀菌剂及其它组分配置成GF型长寿命合成切削液。该产品具有优良的润滑性、防锈性、冷却性、清洗性、杀菌性 ,在集中循环系统中 ,可满足企业的各种进口及国产机床、磨床、车床、铣床等设备及各加工工艺 (车、镗、钻、扩、孔等 )的技术要求 ,具有连续使用三年不变质的独有品质 ,易处理 ,排放少 ,是一种环保型的绿色切削液 ,是长寿命合成切削液的一个突破 相似文献