锻压技术

7055高强铝合金筒形件多道次旋压成形精度与缺陷控制

英文标题：Accuracy and defect control on multi-pass spinning for 7055 high-strength aluminum alloy cylindrical parts

分类号：TG306

出版年,卷(期):页码：2023,48(10):177-181

摘要：

7055铝合金兼具钢的高强度与钛合金的低密度，同时具有良好的耐腐蚀性，且成本远低于钛合金，可推广并应用至固体火箭发动机的制造领域。通过分析毛坯性能、材料可旋性和温度对7055高强铝合金材料的力学性能的影响，制定了合理的工艺试验方案，以研究该材料旋压成形精度以及缺陷控制方法。通过开展7055高强铝合金多道次旋压试验，得到了旋压温度对成形缺陷的影响规律，以及旋轮成形角、进给比对工件成形精度的影响规律。最终确定了成形精度最佳的温度区间为90~110 ℃，旋轮圆角半径为6 mm，进给比为0.40~0.45，实现了7055高强铝合金筒形件壁厚由8.0 mm至1.6 mm的多道次、大减薄量的旋压成形，为该材料应用于固体火箭发动机壳体的旋压成形奠定基础。

7055 aluminum alloy combines the high strength of steel with the low density of titanium alloy and also has good corrosion resistance, and the cost is much lower than that of titanium alloy, so it can be widely applied in the manufacturing field of solid rocket engines. Therefore, by analyzing the influences of blank properties, material spinability and temperature on the machanical properties of 7055 high-strength aluminum alloy, a reasonable process test plan was formulated to study the spinning forming accuracy and defect control methods of the material. Then, by carrying out multi-pass spinning tests on 7055 high-strength aluminum alloy, the influences of spinning temperature on forming defects and the influences of spinning wheel forming angle and feeding ratio on forming accuracy of workpiece were obtained, and the process parameters were determined when the spinning accuracy was optimal with the temperature range of 90-110 ℃, the fillet radius of rotary wheel of 6 mm and the feeding ratio of 0.40-0.45. Furthermore, the multi-pass and large-thinning spinning of 7055 high-strength aluminum alloy cylindrical parts with the wall thickness from 8.0 mm to 1.6 mm was achieved, laying the foundation for the material to be used in spinning of solid rocket engine casings.

基金项目：

孙于晴（1994-），女，硕士，工程师 E-mail：736657131@qq.com

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