With the aid of FE （finite element） code MSC.Superform 2005, 2-D coupled thermo-mechanical simulation of center-crack occurrence in round billet during 2-roll rotary rolling process was presented using Oyane ductile...With the aid of FE （finite element） code MSC.Superform 2005, 2-D coupled thermo-mechanical simulation of center-crack occurrence in round billet during 2-roll rotary rolling process was presented using Oyane ductile fracture criteria. A simple modeling is put forward based on the spiral motion of the workpiece as an essential characteristic in movement. The influence of the feed angle and the entry cone angle of the main roll on the process was taken into account in the modeling. The soundness for simplifying the 3-D rotary rolling into a 2-D problem was discussed. By adopting the parameters of Diescher piercer in 140mm mandrel mill of Bao Steel, the distribution and development of strain/stress were analyzed, and the eigen value of ductile fracture as well. The critical percentage of diameter reduction was obtained from the simulation. The result showed a good agreement with the experimental value, and therefore was of widely guiding significance to the practical process for rationally formulating the deformation parameters of steel tube piercing.展开更多
M公司双闭路联合粉磨系统磨制P·O42.5级水泥,成品比表面积控制指标为(350±15)m^2/kg,系统生产能力只有120 t/h,粉磨电耗高达34 k Wh/t。通过对预粉磨段辊压机挤压做功状况的判定,以及在V型静态气流分级机系统的双旋风收尘器...M公司双闭路联合粉磨系统磨制P·O42.5级水泥,成品比表面积控制指标为(350±15)m^2/kg,系统生产能力只有120 t/h,粉磨电耗高达34 k Wh/t。通过对预粉磨段辊压机挤压做功状况的判定,以及在V型静态气流分级机系统的双旋风收尘器下料管现场取样后的入磨物料细度进行测试,找出辊压机预粉磨系统、静态气流分级机、管磨机存在的影响因素。坚持"磨前处理是关键,磨内磨细是根本,磨后选粉是保证"的原则对系统进行技术改造,系统产量由120 t/h逐步提高至165 t/h左右,增产45 t/h,粉磨电耗降至27.4 k Wh/t。展开更多
文摘With the aid of FE （finite element） code MSC.Superform 2005, 2-D coupled thermo-mechanical simulation of center-crack occurrence in round billet during 2-roll rotary rolling process was presented using Oyane ductile fracture criteria. A simple modeling is put forward based on the spiral motion of the workpiece as an essential characteristic in movement. The influence of the feed angle and the entry cone angle of the main roll on the process was taken into account in the modeling. The soundness for simplifying the 3-D rotary rolling into a 2-D problem was discussed. By adopting the parameters of Diescher piercer in 140mm mandrel mill of Bao Steel, the distribution and development of strain/stress were analyzed, and the eigen value of ductile fracture as well. The critical percentage of diameter reduction was obtained from the simulation. The result showed a good agreement with the experimental value, and therefore was of widely guiding significance to the practical process for rationally formulating the deformation parameters of steel tube piercing.
文摘M公司双闭路联合粉磨系统磨制P·O42.5级水泥,成品比表面积控制指标为(350±15)m^2/kg,系统生产能力只有120 t/h,粉磨电耗高达34 k Wh/t。通过对预粉磨段辊压机挤压做功状况的判定,以及在V型静态气流分级机系统的双旋风收尘器下料管现场取样后的入磨物料细度进行测试,找出辊压机预粉磨系统、静态气流分级机、管磨机存在的影响因素。坚持"磨前处理是关键,磨内磨细是根本,磨后选粉是保证"的原则对系统进行技术改造,系统产量由120 t/h逐步提高至165 t/h左右,增产45 t/h,粉磨电耗降至27.4 k Wh/t。
