尼龙6热压变形行为研究

Study on Deformation Behavior of PA6 under Hot Compression

根据传统制造技术观念,分析结晶型PA6在Tg～Tm(Tf)温度区间变形"相(结构)-(凝聚)态"的意义,使用黄金分割法在其Tg～Tm(Tf)温度区间划分低温和高温双相热固态变形温度区域,同时设计3种热压实验温度。沿用冷压变形研究的镦粗变形模式和试样对PA6进行4种变形速度和3种变形程度的热压变形实验。结果表明,提高PA6热压变形温度和变形速度可以缩减其变形后的回弹效果,且提高变形速度比提高变形温度的作用显著,从而改善热压PA6变形后的定形性,并有可能使PA6高速热锻技术实现实用目标。

Based on traditional manufacRtring concept, the significance of ＇phase structure-condensed＇ state about crystalline PA6 deforming in Tg- Tm（Tf） temperature range was discussed. To this polymer, low and high temperature zones for hot deforming of double-phase solid state were plot out between Tg and Tm（Tf） using golden section, and meantime three experimental temperatures under solid state were designed for hot compressing PA6. As soon as upsetting deformation model and specimens in cold compression study recently published, hot compression experiments for solid state PA6 was done by using four kinds of deformation rate and three kinds of deformation degree. The results showed that springback after upsetting PA6 was minished by increasing deformaton temperature and rate, and the influence of deformaton rate on springback was more significant than that of deformaton temperature, so the settability of PA6 was improved by hot compression, which resulted in that high-speed hot fording for PA6 would be possible to realize practical use.