16 mm热轧带肋钢筋三切分轧制工艺的开发

DEVELOPMENT OF THREE SLITTING ROLLING PROCESS FOR 16 mm HOT ROLLED REBARS

根据张宣科技转型升级复产后二棒产线的产品规格生产计划,具备Φ12~40 mm全规格热轧带肋钢筋生产能力的同时,减少备用轧辊,降低工艺开发成本投入,减少换大小规格时轧机更换数量实现工艺的稳定,保证产线产能水平不降低,对新增加的Φ16 mm热轧带肋钢筋切分选择了三切分轧制工艺。新工艺将孔型共用做到了最大化,实现了粗中轧10架次轧机孔型与Φ12 mm四切分孔型全部共用;为保证3根并联轧件顺利在切分导卫轮处三线分开且三线料型均匀,精轧K3架次切分孔型槽口宽度66.73 mm、切分带厚度0.8 mm;精轧K2架次轧件需扭转90°进入K1架次进口导卫,K2出口扭转导卫采用模块式可快速实现角度调整和导卫更换;针对开发过程中因孔型辊缝设计不合理造成K5架次轧辊加工车削量大的问题,对该架次孔型进行了优化,将辊缝由6 mm增大至15 mm,槽深减小4.5 mm。Φ16 mm三切分工艺生产稳定顺行后,日产量比原两切分工艺增加1000 t,达到了4000 t/天,二棒产线实现了既增加产品规格又保证产线产能水平。

According to the product specification production plan of bar production line two after the transformation and upgrading of Zhangxuan Technology,with the production capacity of full specification hot-rolled rebars ranging from 12 to 40 mm,while reducing spare rolling rolls,lowering the investment in process development costs,and reducing the number of rolling mill replacements when changing sizes and specifications to achieve process stability and ensure that the production line capacity level does not decrease,the three slitting rolling process has been selected for the newly added hot-rolled rebars with a diameter of 16 mm.The new process maximizes the sharing of passes,achieving the sharing of passes for 10 stands of rough and medium rolling mills and all passes for theΦ12 mm four slitting rolling mill.To ensure the smooth separation of the three parallel rolled pieces at the slitting guide and uniform material shape of the three lines,the groove width of the passes for the K3 stand is 66.73 mm,and the cutting strip thickness is 0.8 mm.The rolled pieces of K2 finishing rolling need to be twisted 90°to enter the inlet guide of K1,and the K2 outlet twist guide adopts a modular design that can quickly achieve angle adjustment and guide replacement.In response to the problem of large machining and turning volume of K5 rolling mill rolls caused by unreasonable design of the roll gap during the development process,the roll gap was optimized by increasing it from 6 mm to 15 mm and reducing the groove depth by 4.5 mm.After the stable and smooth production of theΦ16 mm three slitting process,the daily output increased by 1000 t compared to the original two slitting process,reaching 4000 t per day,achieving both increased product specifications and guaranteed production capacity of the bar production line two.