铜包钢棒三辊固-液铸轧复合工艺侧耳产生原因及调控策略

Formation reason and control strategy of lateral ears in three-roll solid-liquid cast-rolling compound technology for Cu/steel cladding bars

融合固-液铸轧复合技术和多辊孔型轧制技术,提出了金属包覆材料的三辊固-液铸轧复合工艺,为了解决封闭孔型内覆层金属变形过程中产生的边部侧耳问题,以铜包钢棒为研究对象,基于DEFORM软件建立了三维有限元仿真模型,分析了间隙类型和凝固点对边部侧耳的影响规律。结果表明,边部侧耳的产生根源是铸轧区的配合间隙,并且受凝固点影响显著;间隙类型为组合间隙时,变形区内的连续挤压区是形成大量连续边部侧耳的主要原因,通过提高设备装配精度和调控凝固点位置可以有效抑制边部侧耳的形成。此外,利用铸轧辊系和仿形侧封构建组合孔型可以实现边部侧耳几何结构的精细调控,有望将其作为翅片结构起到强化作用,用于制备热交换纵翅复合管。

Combining solid-liquid cast-rolling compound technology and multi-roll groove rolling technology,the three-roll solid-liquid cast-rolling compound technology of metal cladding material was proposed.To solve the lateral ears problem generated in the deformation process of cladding metal in the closed groove,taking Cu/steel cladding bars as the research objects,the 3D finite element simulation model was established based on the DEFORM software.The influence of clearance types and kissing point on lateral ears was analyzed.The results show that the cause of the lateral ears is the assembly clearance in the cast-rolling area,and it is significantly affected by the kissing point;when the clearance type is the combined clearance,the continuous extrusion area in the deformation area is the main reason for the formation of a large number of continuous lateral ears.By improving the assembly accuracy and adjusting the position of kissing point,the formation of lateral ears can be effectively suppressed.In addition,the geometric structures of lateral ears can be finely adjusted by constructing grooves using cast-rolling rolls and conformal side dam,which is expected to play a strengthening role as fin structure for fabricating longitudinal fin cladding tubes used in heat exchangers.