在轧制过程轧辊磨损热评价的新方法中英文翻译资料.doc
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1、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
2、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 inves
3、tigatedThis 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
4、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 controll
5、ing 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
6、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,a
7、nd 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
8、 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
9、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
10、 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 induct
11、ion 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 t
12、he 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 equipm
13、ent, 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 t
14、he 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-frequ
15、ency 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
16、 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
17、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-150ARo
18、ckwel1 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 Res
19、ults 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 severeHo
20、wevera 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 insta
21、nce,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
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