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针对传统飞机蒙皮件实体模具拉形工艺费用高的问题,提出一种采用可变型面模具进行蒙皮件柔性拉形的先进方法。介绍了可变型面模具的结构组成,阐述了3种模具调形方式的工作原理与特点,以球形件为研究对象,研究了不同的模具离散模式和基本体冲头尺寸对拉形件局部变形和形状误差的影响规律。研究表明:弹性垫的厚度是基本体冲头方体边长的1.25倍时,既能有效地抑制工件的局部变形,又能保证工件的成形精度;对于厚1 mm、曲率半径为1 500 mm球形件,成形精度要求为0.5 mm以下,选择基本体离散排布矩阵为32×40满足生产要求。
Aiming at the problem of high cost of drawing process of solid mold of traditional aircraft skin, an advanced method of flexible drawing of skin is proposed by using variable mold. The structure and structure of the variable die are introduced. The working principle and characteristics of the three die adjusting methods are described. Taking the spherical die as the research object, the effects of different die discrete modes and basic body punch dimensions on the local deformation And the impact of shape error. The results show that the thickness of the elastic pad is 1.25 times longer than the side length of the basic punch body, which can not only effectively suppress the local deformation of the workpiece but also ensure the forming accuracy of the workpiece. For the thickness of 1 mm, the radius of curvature is 1 500 mm Spherical parts, the forming accuracy requirements of 0.5 mm below the basic body discrete matrix is 32 × 40 to meet production requirements.