在轧制过程轧辊磨损热评价的新方法中英文翻译资料.doc

New Method for Evaluating Thermal Wear of Roils in Rolling ProcessAbstract：A new method was developed by a thermal wear machine to evaluate the thermal wear of rolls in steel rolling processThe stee1 strip and rolls were simulated by upper and 1ower heating disksThe upper heating disk could be kept at a temperature of over 900 by induction heatingThe pressure between the disks as high as 323.2 MPa could be achieved and the slipping rate could be 12.7 The thermal wear of high speed steel(HSS)roll material，the wear rate of the HSS roll，and the SEM morphology of a worn HSS roll surface were investigatedThis method was useful and could be employed to simulate friction and wear between strip and roll during the strip roiling processKey words：therma1 wear；roll；friction；strip rolling；Induction heatingThe roll is one of the most important tools in the rolling processIts surface may get worn out because of the relative slip between the roll surface and steels for the fast changes in both rolling force and temperature In designing and calculating the wear crown of rolls，the roll wear is a very important factor and has to be taken into consideration，as it can reduce the difficulty in controlling steel shape and increase the accuracy in the calculation model of the roll wear crown Furthermore，the wear of the roll surface will directly affect the surface quality of stee1 Therefore，it is significant to develop an approach method to evaluate the roll wear and to study the mechanism of roll wear based on friction theoryTo date，many studies have been carried out concerning roll wear For example，Kato developed a thermal wear equipmentwhich is a disk shaped machineHowever，it is difficult to simulate the wear between steel and roll during the rolling process，as the disk is smal1 and thin，and the load is not very largeGlottal E and Li et alE. studied the thermal wear attribution of wear-resistant materials 9Cr2 and 3Cr2W 8V， and the thermal wear equipment they used was a pin disk machine，which could not be used to simulate the thermal wear of the rol1Liao used a smal1 mil1 to roll the wire and studied the thermal wear of the roll with high Cr cast ironHowever，this equipment was a mil1 and the work piece that needed to be heated and rolled for stud ring the frictional wear Thus，for some work pieces it was almost impossible to study the wear under different slipping rate and load for a long period In this paper, the thermal wear test method is developed，which is a disk-like machine The upper and lower disks are used to simulate the workpiece and the roll，respectively The upper disk can be heated up to 900 through an induction coil The load can be exerted as high as 323.2 MPa between disks，and the maximum slippage ratio is 12.7 1 PrincipleTo evaluate the thermal wear of rolls, a new test machine was developed，which was disk-like on the basis of the 2-high 1 60 mm mill The disk，drive shaft，bearing block， and forcing equipment were designed and manufactured。and the induction heating equipment was designed with a special shape to heat the upper disk where the temperature could reach higher than 900The upper and lower disks could be used to simulate the workpiece and the rolls during hot rolling，respectively The ratio of the slip between disks could be determined by the forward slipThe lower disk with different embedded materials could be employed to study the wear of the roll under some rolling condition.The original 2-high160 mm mill consists of motor-driven equipment， a reducer，and junctorThe devices to be designed are disk，shaft，bearing block， forcing equipment， balancing spring， end cap，cushion ring，junction box，back plate，and so on The high frequency induction equipment is designed as a special heating mode(1)The dimension of the upper disk is 160 mm 30 mm and that of the lower disk is 160 mm 50 mm The disk material is 45 steel and the dimension of the experimental roll material is 10 mm 10 mm ，which is embedded on the periphery of the 1ower disk(2)The materia1 of the drive shaft is 40Cr steel which is hollow for water coolingThe bearing block，the forcing equipment，and the balancing spring are also designedFor this purposeThe GP10-C1 high-frequency induction apparatus is employed，and the induction power source and the parameters are listed in Table 1The surface of the inverse upper disk is heated by the GP10-C1 induction power source according to the theory of skin effect of electromagnetic induction heatingThe induction coil is specially designed as a semicircle for a continuous heating of the inverse upper diskThe experimental setup for testing thermal wear including the heater and water cooling system of the disks is schematically illustrated in Fig1The conductor material is T1 or T2 pure copper tube and the dimension is 10 mm 1 mm. 2 ExperimentalTo test the validity of the machine performanceroll material of high speed stee1(HSS) was embedded in the 1ower disk The chemica1 composition of the roll material (mass percent)is listed in Table 2The original hardness of the experimental material was HRC 51.3 measured by HR-150ARockwel1 hard meterThe worn amount of HSS rol1 materia1 under different loads and slipping rate was measured using the SARTORINS BSIIOS electronic balance after cleaning and dryingThe morphology of the worn surface of the specimen was observed through a scanning electron microscope (PH ILIPS-505)3 Results and DiscussionThe wear ratio curve is presented in Fig.2，which indicates the wear ratio as a function of cycles for specimen in different slipping rates of S=4.8%-12.7% and loads of =141.5- 323.2 MPaIn the experiment，the temperature of the upper disk was900 ， at which the wear was most severeHowevera decrease in the thermal wear owing to the oxide layer did not occur in this experimentIt could be seen that the wear ratio curve increased with increasing slippage and loads Loads played a more important role than slipping rate for therma1 wear Some interesting effects were observed，for instance，wear ratio increased slightly before 1680 cycles The reason could be that the roll surface was protected from wearing by the thin black oxide layer generated on itThe microstructure of the HSS roll surface has been investigated under different rotational speeds of the rol1 between the 1ower disk at 530-580 and the upper disk at 880-930Fig.3 shows the SEM morphology of the HSS surface under variable rotational speeds when the slipping rate S is 12.7% and the load is 323.2 MPaFrom Fig.3(a)，it can be seen that there is oxidized frictiona1 wear on the HSS roll surfaceFrom Fig.3(b)and Fig.3(c)，it can be seen that it forms grain-abrasion of the cavity for the oxide dropping as the rotational speed increasesFig.3(d)shows that there is adhesive wear on the HSS roll surface for increased loads，and the wear mechanism is of oxidation wear grainabrasion wear，and adhesive wear at the same timeThe effect of abrasion occurs in contact situation where direct physical contact between two surfaces is given，and one of the surfaces is considerably harder than the otherThe harder surface asperities press into the other surface with plastic flow of the soft surface occurring around the asperities of the harder surfaceWhen a tangential motion is imposed on the harder surfacethe soft materia1 is removed because of the combined effect of “micro-cutting” and “micro-cracking”It is quite difficult to relate adhesive wear processes with elementary bulk properties of materialsThe oxidation wear occurs because of high temperature of the rol1The oxide is diffused in the matrix the black oxide layer is exfoliated from the roll surfacePlasticity deformation slippage wear is caused by the deformation of the roll surface and the relative motion between the strip and roll附录二翻译在轧制过程轧辊磨损热评价的新方法摘要：新方法是由热磨损机器发展到评价在轧钢过程中的热辊的磨损。在带钢和卷，模拟了上下加热盘。上部加热磁盘可能维持在超过900感应加热温度。高达323.2兆帕斯卡的压力磁盘可以实现，下滑速度可能是12.7。在高速钢热磨损（高速钢）辊材料，高速钢辊的磨损率和磨损的高速钢轧辊表面的SEM形貌进行了研究。这种方法是有益的，可以用来模拟之间的摩擦和磨损带和在带卷翻滚过程。关键词：热磨损;辊;摩擦;带轧制;感应加热在轧制过程中辗轧是最重要的工具之一。它的表面可能会磨坏,由于钢辊面和相对滑移出两个轧制力以及温度变化较快。在设计和计算扎辊磨损量时，轧辊磨损是一个非常重要的因素。在控制钢铁形状以及辊磨损计算模型的准确性时它可以降低难度。此外，辊面的磨损将直接影响钢材表面质量。因此，重要的是建立一个适当的方法评价辊磨损，并基于摩擦理论基础研究滚动磨损。到目前为止，已经开展了许多关于辊磨损的研究。例如，加藤发展无热磨损设备，这是一种盘状成型机。然而，很难模拟轧制过程中的钢辊之间磨损磁盘，因为它不但小而薄，而且负载不是很大。郭，李等人研究了磨损的热磨损的归属，耐磨材料9Cr2and 3Cr2W 8V和热磨损的设备，他们使用的磁盘机的引脚，不能用来模拟轧辊的热磨损。廖某使用了一个小厂推出的电线，并研究了以高铬铸铁轧辊的热磨损。然而，这一设备是为了工件加热和辗轧进行磨损研究而推出的。因此，对一些工件，研究不同滑移率和长期负载的磨损这几乎是不可能的。在这篇论文中，热磨损测试方法很先进，它像一个机磁盘。上下磁盘来模拟工件和辗轧，分别，上层磁盘可以通过加热到900诱导线圈。在可高达323.2兆帕斯卡磁盘之间产生高负荷，最大滑移率为12.7。1原则 评价热辊磨损的一个新的试验机研制成功，这是一个类似盘型一样的直径60毫米轧机。磁盘，传动轴，轴承座和感应加热设备。设计了有特殊形状的上盘其温度可高于900摄氏度。上下盘可以用来模拟在热轧工件和辗轧，分别之间的滑移率磁盘可以由前滑决定。嵌有不同材料的低磁盘可以用来研究在某些条件下轧制辊的磨损。原来的2m高的直径160毫米的轧机由马达驱动，交连设计的设备是磁盘，轴，轴承座，平衡弹簧，端盖，垫环，接线盒，背部板等.高频感应加热装置的目的是为一个特殊的加热方式。（1）上盘尺寸是直径160毫米 30毫米，低磁盘直径160毫米 50毫米。磁盘材料45钢和实验卷筒材料其直径10毫米 10毫米，嵌入到下盘边缘。（2）驱动轴