Centrifugal roll neck casting process improvement

2020 - centrifugal roll neck casting process improvement 03 - 27 Zhao Xiangbiao ( Utilizing the west hit the guest) One, the existence question: centrifugal roll mill roll factory has been using longnan dragon yttrium heavy rare earths nodularizer, tensile strength is generally about 600 mpa, the lowest in 575 mpa, gb ≧ 350 mpa, the production of centrifugal roll core spheroidizing effect is shown in figure 1. Figure in early August 12019, mill roll factory, vice factory director to lead two technical personnel to the domestic advanced roll to the study of enterprise, through the study found that domestic advanced roll enterprise is relatively cheap light rare earths used by common roll nodularizer, in more important board tape on the roll to use heavy rare earths nodularizer, and other common centrifugal roll core control the tensile strength of about 450 mpa. Based on the study, the quality of our ordinary centrifugal roll the presence of excess. Based on this situation, the mill roll factory technology group started to improve the neck of centrifugal roll casting process, a preliminary target in cervical mechanics performance of the centrifugal roll from 600 mpa to 500 mpa, again for further tracking usage for validation. Second, improvement of methods and measures for common centrifugal roll quality exists surplus situation, and on the basis of in the study case, the casting process for the following adjustments: 1, melting since August 9, 2019, all the centrifugal roll casting half suspended, outer molten iron reduction activation add 500 kg pig iron, before pouring. Half steel roll to continue a most original pouring two way. In pig iron reduction when taking pictures sent WeChat messages, this red line management into the process. 2, centrifugal roll box pouring quantity of silicon zirconium alloy metal-stream since August 9, 2019 by 2 kg/t, instead of 1 kg/t. 3, 2 for the improved effect of the roll neck sampling metallographic results, from the point of metallographic, spheroidization rate improved, spheroidizing effect is reduced to a certain extent, original mechanical properties tests, the results of 520 mpa, preliminary improvement purpose. The follow-up still need further tracking verification test roll to use the computer usage, according to the usage of computer to improve further. Figure 2 through lower performance with purpose, and in the same industry advanced enterprises, and reduce the roll production cost, now with more than the original ones - tons of roll to save 100 yuan 300 yuan, the annual cost saving at least $200000.