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    • 6. 发明申请
    • METHOD AND APPARATUS FOR CREEP FORMING OF AND RELIEVING STRESS IN AN ELONGATED METAL BAR
    • 在延长金属条中形成和消除应力的方法和装置
    • WO2007133546A2
    • 2007-11-22
    • PCT/US2007/011113
    • 2007-05-08
    • RTI INTERNATIONAL METALS, INC.MINAKAWA, KuninoriKESKAR, Arvind R.BARB, Adrian
    • MINAKAWA, KuninoriKESKAR, Arvind R.BARB, Adrian
    • F16B21/09
    • B21D11/02
    • A hot creep stretch wrap forming method includes heating a metal bar to a forming temperature within a temperature range suitable for creep deformation thereof, applying a stretching force to the metal bar at a strain rate no greater than 0.05 inch/inch/second, and wrapping the metal bar around a die, preferably having a thermally and/or electrically insulative work surface. The stretching force is typically applied to a strain ranging from 0.5% to 15.0%. The metal bar most preferably is a titanium alloy with a forming temperature ranging from 0.45 to 0.60 of its melting temperature. The wrapped metal bar is held in position and its temperature maintained within the temperature range typically for 5 to 120 minutes for stress relief. Preferably, the metal bar is held substantially at the forming temperature throughout the process. Thermal insulation around the die and metal bar reduce heat loss from the metal bar.
    • 热蠕变拉伸缠绕成形方法包括将金属棒加热到适于其蠕变变形的温度范围内的成形温度,以不大于0.05英寸/英寸/秒的应变速率向金属棒施加拉伸力,以及包裹 金属棒围绕模具,优选地具有热和/或电绝缘的工作表面。 拉伸力通常用于0.5%至15.0%的范围。 金属棒最优选是其熔融温度的成形温度为0.45至0.60的钛合金。 包裹的金属棒保持在适当位置,其温度通常保持在5至120分钟的温度范围内以减轻应力。 优选地,金属棒在整个过程中基本保持在成形温度。 模具和金属棒周围的隔热减少了金属棒的热量损失。