中文摘要：

以传统双辊铸轧技术为基础,提出一种双金属复合管固-液铸轧复合近终成形工艺,利用专门的环形布流器,将液态覆层组元金属均匀地注入铸轧辊圆孔型与芯管基材所构成的环形结晶器内,利用快速凝固与轧制复合技术,将覆层金属均匀包覆于芯管基材表面。为揭示铸轧区内铸轧辊-覆层金属-芯管基材间的相互作用力学行为,利用Fluent软件对环形结晶器内覆层金属凝固过程进行热-流耦合分析,确定固相轧制复合变形计算区域。假设芯管基材为刚性体,可将固相轧制复合变形阶段视为纯减壁的带芯棒轧管过程,并依此推导固-液铸轧复合过程的轧制力工程计算公式,给出各参数的取值方法。在实验室条件下成功制备了外径38 mm、基层与覆层厚度均为4 mm的不锈钢/铝复合管,轧制力实测值与模型计算结果基本吻合,验证了工程计算公式的可靠性。研究成果对复合管固-液铸轧复合装备及工艺设计提供了理论依据。

英文摘要：

Based on traditional twin-roll casting technology, a solid-liquid cast-rolling bonding （SLCRB） process of bimetallic clad pipe is proposed. Using the special annular delivery device, molten cladding metal is evenly cast into the circular crystallizer, which formed by the round grooves of the casting rollers and core pipe. The cladding metal is coated uniformly to the core pipe under the rapid solidification and roll bonding. To reveal the interaction of the mechanical behavior between the casting rollers, cladding metal and core pipe, the thermal-fluid coupled model of cladding metal solidification process in the circular crystallizer is built firstly by the software of Fluent, and roll bonding deformation computation zone of solid phase is confirmed. Assuming the core pipe as a rigid body, roll bonding deformation process of the solid phase is regarded as the wall reduction process of the pipe rolling with mandrel. Therefore, the engineering calculation model of the rolling force in the SLCRB process is derived, and the methods of determining the value of each parameter are presented. The stainless steel/aluminum bimetallic clad pipe, with outer diameter？ 38 mm and the thickness of cladding layer and cored pipe wall 4 mm respectively, is fabricated successfully under laboratory conditions. The measured rolling force agrees with the calculation results, which verifies the reliability of engineering calculation model. The research results provide the theory basis for the equipment and process design of the SLCRB process.