【摘要】 以研发聚合物锻造技术为目标,以镦粗变形模式对无规立构PMMA进行3种变形速度和4种变形程度的冷压变形试验。试验结果表明,镦粗变形模式可以改变无规立构PMMA在拉伸试验(单向拉应力)下的脆性性质,使其获得一定程度的"类塑性"或固态成形性,并显示出变形后的回弹随变形速度提高而减小的变化趋势,但过大的回弹使其很难具有应用价值。因此,通过分析推断,为了把固态成形方法拓展到聚合物锻造技术领域,需要改变聚合物冷压变形模式,如采用"热压+冷处理",或采用高速锻造成形技术等。更多还原

【Abstract】 In order to study and develop forging technology for polymers,cold compression tests for atactic PMMA was done with upsetting deformation by using three kinds of deformation rates and four kinds of deformation degrees.In the tests,atactic PMMA′s brittle behavior in the tensile deformation could be improved and some plastic-alike behavior(or solid state formability) could be attained by upsetting deformation.Meanwhile,the tendency appeared after cold compressing that elastic recover decreased with the increase of deformation rate,but too large elastic recover could make upsetting not be applied in polymers forging.Through analyzing test results,it will be necessary that cold deformation is changed to hot-forming + cold treating or high speed forming,etc.in order that polymer forging technology may be used in industrial manufacturing.更多还原