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结论
本论文是对υ950轧机的设计及压下装置的设计，通过在炼钢厂连轧作业区的参观实习，使我对Φ950轧机的设计有了更深层的认识。
我主要针对的是轧机的计算和部分的校核，我的专题设计是压下装置的设计。在本设计中的轧机是二辊可逆式轧机，在电动机的选择方面选用直流电动机。压下装置采用快速电动压下装置，压下装置的电动机采用直流电动机。上辊平衡装置选用液压平衡装置。在机架的选择方面，选用了高刚度和强度的闭式机架，节约能源。并对以上的件都做了强度计算和校核，都满足校核条件。
毕业设计是我们大学学习中的最后一次课程，也是理论与实践相结合的过程，使我确实学到了很多有用的知识，为以后的工作做了铺垫。大学生活即将结束，等待着我们的将是美好的未来！
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参考文献
[1] 邹家祥．轧钢机械[M]．北京：冶金工业出版社，2004．
[2] 机械电子工业部．大电机产品样本[S]．北京：机械工业出版社，1989． [3] 施东成．轧钢机械设计方法[M]．北京：冶金工业出版社，1990．
[4] 马鞍山钢铁设计院．中小型轧钢机械设计与计算[M]．北京：冶金工业出版社，1979． [5] 徐灏．机械设计手册 第三卷[S]．北京：机械工业出版社，1991．
[6] Maintenance of the circulating oil[J]．IRON AND STEEL ENGINEER，2002，1.73． [7] 刘宝珩．轧钢机械设备[M]．北京：冶金工业出版社，1984． [8] 刘鸿文．材料力学 第三版上册[M] ．北京：高等教育出版社，2002． [9] 王海文．轧钢机械设计[M] ．北京：机械工业出版社，1983．
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附录A
Maintenance of the circulating oil
1. Oil system cleanliness
In a new oil system, as well as in a system which has been drained owing to repair or oil change the utmost care must be taken to avoid the ingress and presence of abrasive particles. Because filters and centrifuges will only remove these slowly, and some are therefore bound to find their way into bearings etc
Fir this reason- - prior to filling-up the system - careful cleaning of pipes, coolers and bottom tank is strongly recommended
2. Cleaning the circulating oil system
The recommendations below are based on our experience, and laid out in order to give yards and operators the best possible ad-vice regarding the avoidance of mishaps to a new engine, or after a major repair
The instruction given in this book is an abbreviated version of our flushing procedure used prior to shop trial. a copy of the complete flushing procedure is available through MAN B&W or the engine builder 2.1 cleaning before filling-up
In order to reduce the risk of bearing dam-age, the normal careful manual cleaning of the crankcase, oil pan, pipes and bottom tank, is naturally very important.
However, it is equally important that the system pipes and components, between the filters and the bearings, are also carefully cleaned for removal of \scales.
If the pipes have been sand blasted, and thereafter thoroughly cleaned or \then this ought to be followed by \with an alkaline liquid, and immediately afterwards the surfaces should be protected against corrosion in addition ,particles may also appear in the circulating oil coolers, and therefore we recommend that these are also thoroughly cleaned.
2.2 flushing procedure, main Lub.Oil system
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Regarding flushing of the camshaft lube oil pipes:
Engines with Uni-Lube system. see Camshaft lubrication for engines with Uni-Lube system ltem3
Engines without Uni-Lube system see 'Separate camshaft lube oil system,' ltem 2.3
However, experience has shown that both during and after such general cleaning airborne abrasive particles can still enter the circulating oil system .For this reason it is necessary to flush the whole system by continuously circulating the oil- while by passing the engine bearing, etc
This is done to remove any remaining abrasive particles, and, before the oil is again led through the bearings, it is important to definitely ascertain that the system and the oil have been cleaned adequately
During flushing (as well as during the preceding manual cleaning) the bearings must be effectively protected, against the entry of dirt.
The methods employed to obtain effective particle removal during the oil circulation depend upon the actual plant installations especially upon the filters type, lub oil centrifuges and the bottom tank layout
Cleaning is carried out by using the lub.oil centrifuges and by pumping filter, with fine-ness down to 10 um, is often used as a supplement to or replacement of the system filter. the following items are by-passed by blanking off with special blanks: a) The main bearings b) The crossheads c) The thrust bearing d) The chain drive
e) The turbocharger (MAN B&W,MET) f) The axial vibration dampen
g)The tensional vibration damper(if installed) h) The moment compensators (if installed) See also Plates 70820, 70821
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It is possible for dirt to enter the crosshead bearings due to the design of the open bearing cap .It is therefore essential to cover the bearing cap with rubber shielding throughout the flushing sequence.
As the circulating oil cannot by-pass the bottom tank, the whole oil content should partake in the flushing
During the flushing, the oil should be heal-ed to 60-65C and circulated using the full capacity of the pump to ensure that all protective agents inside the popes and components are removed.
It is essential to obtain an oil velocity which causes a turbulent flow in the pipes that are being flushed.
Turbulent flow is obtained with a Reynolds number of 3000and above. Re=V*D/V*1000, where Re=Reynolds number
V=Average flow velocity (m/s) D=Pipe inner diameter (mm) v=Kinematics viscosity {cSt}
The preheating can be carried out .for in-stance, by filling the waterside of the circulating oil cooler (between the valves before and after the cooler)with fresh water and then leading steam into this space. During the process the desecrating pipe must be open, and the amount of steam held at such a lever that the pressure in the cooler is kept low.
In order to obtain a representative control of the cleanliness of the oil system during flushing,” control bags\0 mm long but with an area of not less than 1000cm, and made from 0.050 mm filter gauze).Proposals for check bag housings are shown on Plate 70821.
To ensure cleanliness of the oil system after the filter, two bags are placed in the system, one at the end of the main lub.oil line for the telescopic pipes, and one at the end of the main lub.oilline for the bearings.
To ensure cleanliness of the oil itself. an-other bag is fed with circulating oil from a connection stub on the underside of a horizontal part of the main pipe between circulating oil