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本文对连铸生产中因结晶器及振动偏移(俗称对弧不正)而发生漏钢、裂纹等情况,从力学角度在理论上进行了论证。着重于偏移对结晶器下口处坯壳力学因素的影响。得出:①偏移量Δ的增减对坯壳强度的影响很大,Δ变动0.5～0.8mm,坯壳应力的变化为1.9～3倍;②坯壳内外表面的延伸率也随偏移量之增大而增加,根据坯壳强度及延伸率要求,提出了合适的偏移量不大于0.5mm。③在一定的Δ而拉速不同时,对坯壳强度在数值上的影响不大,Δ=0.5mm,150×1050和150×280mm两种铸坯拉速增加0.6M/min,应力仅增加了9.3％和6.4％。对延伸率的影响则更小。据此提出了若适当减小偏移量,在冶金因素相同的条件下,不但拉速可略加提高而坯壳应力反可得到降低,使现有连铸机有挖潜增产之可能。此外,文内对偏移影响结晶器的寿命问题也有所论及。
In this paper, continuous casting due to mold and vibration offset (commonly known as the arc is not correct) and the occurrence of steel leakage, cracks and so on, from a mechanical point of view in theory demonstrated. Focus on the offset of the crystallizer under the impact of the mechanical properties of the shell. The results show that: (1) The increase or decrease of the offset Δ has a great influence on the strength of the shell, the change of Δ is 0.5 ~ 0.8mm, and the change of the stress of the shell is 1.9 ~ 3 times; ② The elongation of the inner and outer surfaces of the shell also varies with the offset The amount of increase and increase, according to the blank shell strength and elongation requirements, put forward a suitable offset not more than 0.5mm. ③ At a certain Δ pull rate is not the same, the strength of the blank shell has little effect on the value, Δ = 0.5mm, 150 × 1050 and 150 × 280mm two kinds of billet speed increased 0.6M / min, the stress increases only 9.3% and 6.4% respectively. The impact on elongation is even smaller. Based on this, it is pointed out that if the offset is properly reduced, under the same metallurgical factors, not only the pulling speed but also the stress in the billet can be reduced, which makes it possible for the existing caster to tap the potential. In addition, the text on the offset affect the mold life issues are also discussed.