钛合金薄壁零件数控热拉伸蠕变复合成形研究进展

State of the Art of Hot Stretch-creep Compound Forming for Thin-wall Titanium Alloy Components

摘要:

数控热拉伸蠕变复合成形是一种精确成形钛合金薄壁零件的新技术。该技术采用自阻加热等加热方法将先进轻质钛合金薄壁板材或型材坯料加热至热成形温度后进行数控热拉伸弯曲成形，然后适量补拉工件，接着在保温阶段保持工件贴模使材料蠕变，工件内应力发生在线松弛，从而达到减小回弹，提高零件成形精度的目的。系统介绍了钛合金薄壁零件数控热拉伸蠕变复合成形新技术的研究现状、工艺原理、关键装备、工艺技术及其优缺点，并指出了这种新技术的未来应用前景

Abstract:

Hot stretch-creep process is a novel compound forming approach for thin-wall titanium alloy components. In this process, a thin-wall stock of metal sheet or profile is stretched and bended after heating to the hot forming temperature via the heating methods such as resistance heating. When the finial configuration is formed, the temperature remains and the material creeps along stretch direction based on the mold surface. This leads to the internal stress decrease in the formed workpiece and a stress relaxation on-line. Then the springback of the component is reduced due to the decrease of the residual stress and the forming precision is improved. The research status, process principle, key equipment, processing technology, and the merits/demerits of the new process and technology were introduced. Finally, the applications of hot stretch-creep compound forming technology in future are proposed