moncler daunenjacke Single stand reversing cold mi

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Single stand reversing cold mill work roll thermal deformation

Showed significant asymmetric distribution and a larger radial temperature difference between the layers. This is because the work roll shift changed the work roll and strip the exposure, sliding side as part of the work roll is not roll with the rolling or intermediate exposure, so this part of the lower temperature, the contact area with the rolling temperature is relatively high; other rolling lOmin, the work roll temperature field has not yet stable, and therefore a larger temperature difference between the layers, the temperature will increase as the rolling time becomes smaller and stable. , Presented Chan H roll temperature field in Figure 3, Fig. 3Temperaturefieldofworkroll Figure 4 for the work roll temperature to stabilize after the work rolls off the assembly line the surface temperature and measured temperature, shown in Figure 4, the calculated values of work roll surface temperature of up to 57 ℃,[link widoczny dla zalogowanych], higher than the temperature measured off the assembly line. This is because the work roll temperature is in the roll off the assembly line for the measurement immediately after roll, just off the assembly line because the cooling effect of emulsion still exist, but not the deformation work and friction heat, so the measured temperature compared with the calculated line low. The calculated values of roll temperature difference between the temperature of emulsion is only 7 ℃, (coolant temperature 50 ℃), the deformation work and friction heat from the rolls leaving the temperature rise does not exceed 10 ℃. Analyzing the reasons, mainly cold rolling mill is equipped with a strong cooling and lubricating system for a single stand cold rolling mill, the design of the cooling flow of lubrication system 6000L/min, in this large flow of cooling lubricant, it can be more stable roll temperature field. , Ji H k gifts left from the work roll length / mm Figure 4 roll off the assembly line the surface temperature of Fig. 4Rollsurfacetemperatureafterrolling3.2 roll thermal crown rolling Figure 5 in order to stabilize the thermal crown, its distribution and temperature distribution of the same. Lateral movement of the work roll thermal crown so that the mill center line of the distribution is not symmetrical to the axis of symmetry would lead to the emergence of asymmetrical wave shape, it must master its variation and using appropriate methods (such as sub-cooling) control. From the left side of work roll length / mm Figure 5 work roll thermal crown Fig. 5Workrollthermalcrown4 Conclusions 1) For there is no suitable analytical method within the roll gap deformation work and friction heat, this paper considers the contact arc length along the width direction of the change, the process of establishing a cold rolling mill roll and friction heat within the roll gap and rolling the plastic deformation work model, calculated by numerical integration in the process of cold rolling friction heat and deformation work. 2) the establishment of a cold model of work roll thermal deformation. Calculation, taking into account the roll surface circumferential heat flux on the temperature field, the roll surface divided into different areas, and calculated the roll rotation, different cooling media and roll the heat exchange to determine the roll surface temperature,[link widoczny dla zalogowanych], and then Starting from the basic laws of heat transfer and establishment of differential equations to solve the work roll temperature field and thermal deformation. 3) the development of thermal deformation of work roll cold rolling process, calculated and analyzed 6H3C mill work roll temperature field, thermal crown law. After validating the model's accuracy to meet the actual requirements. (Continued on page 187) 1 Chen Wenlin et al: drawbead Numerical Simulation of Restraining Force 187 (continued from page 154) [1] [2] [3] [4] Wang Guodong. Shape control and shape theory [M]. Beijing: Metallurgical Work Press, 1988, Yan Peng, Hong-Min Liu, Hu Jianping. Shape analysis of cold-rolled strip and pre-set control system software,[link widoczny dla zalogowanych], L5 (FAPCSR) and its application [J]. Steel, 2003.38 (2) :34-37 [6] AATseng. SXTonga. TCChen. ThermalexpansionLandcrownevaluationsinrollingprocesses [J], MaterialandDesign, 1997.1 (1 Cool

:29-41Yuan-LiangHsu, Chang-HueiWu. Animprovementofthethermalmodelforproducingtheultra-thinstripsinaconventionalhotstripmill [J], IEEE,[link widoczny dla zalogowanych], 2004. (5): 891 896 Kongxiang Wei, Li Ren Long, WANG Bing-xin. Roll Temperature Field and Thermal Crown calculate the axial [J], Iron and Steel Research, 2000.12 (Suppl) :51-54 Siemens Workbook (internal data) Rao Zhong Peng forward. Heat Transfer [M]. Beijing: Beijing Institute of Technology Press, 1995

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