Structure Analysis And Optimization And Program Design Of Segment

In recent years,with the rapid development of heavy equipment manufacturing industry in our country,the demand of high quality and large-size steel products significantly increases,which promotes the development of continuous casting steel with large section size,like the wide-thick slab.Large section size has become one of the major development trends for continuous casting.However,with section size of continuous casting steel significantly increased,the reliability and stability of segment of continuous casting machine are more prominent,which severely restricts the efficient and stable production of high quality continuous casting steel and rolling products.In view of this,this paper takes the segment of continuous casting machine in domestic steel mill as the research object.Based on the actual data of the site,the deformation and stress distribution of the segment frame and key part were investigated with thermal-mechanical coupling method in the present paper,and proposed reasonable optimization structure and design program for heavy reduction(HR).The main contents and results are as follows:(1)The mandrel type four-section roll was suitable for the single-point heavy reduction,and the module structure selection included spherical roller bearing and CARB toroidal roller bearing,multi-stage planetary reducer and six-stage AC servo motor drive system,oil-air lubrication system;(2)The calculation program of mandrel deflection,bearing safety factor and stress distribution applicable to all kinds of caster roll was designed.According to the calculation results,the static load safety factors of each bearing of the caster roll were all above 2.0,which meet the bearing requirements.The equidistant joint stress values was less than the allowable stress of the material meets the strength design requirements and the deflection was less than 1mm,meeting the stiffness design requirements;(3)The thermal mode of the roll sleeve structure under different thermal environments was analyzed,and the natural frequency of the structure decreased with increasing temperature.It could be obtained by comparing the uniform temperature field and the non-uniform variable temperature field.Although the thermal stress didn't dominate the natural frequency of the structure,it had an important effect.For non-uniform thermal environment,the influence of thermal stress on vibration characteristics must be considered.According to the thermal change and thermal stress limitation of the roller sleeve structure,the roll sleeve structure had been properly explored and optimized,and it was concluded that the thermal stress and thermal deformation performance of the roll sleeve was the best when the number of cooling circulation water tanks was 12;(4)The segment frame was modeled in 3D and the heat transfer and static analysis of the segment frame were obtained.The independent control segment frame structure had more advantages but still needed to be strengthened in accordance with the needs of site;(5)Based on the modal theory,the natural frequencies and vibration modes of the hydraulic rod support device were obtained.On the basis of the analysis of overall segment frame,the hydraulic rod support device was optimized by topology theory.It was found that the lower plate of hydraulic rod support device can be appropriately thinned after analysis.The parameterized optimization analysis for the thickness of the rib was obtained.The thickness of rib plate was 10.324mm,which was the optimal solution.