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恒力弹簧的优异性能依赖于其各位置等自然曲率的特性,而目前的成形工艺中,恒力弹簧稳定化热处理时,受到其自身几何形状的限制,表现出外层自然直径大于内层的偏差,影响了恒力弹簧的精度。为克服这一工艺难点,提出了拉压复合连续弯曲成形的概念,用于此类构件的成形。采用数值模拟的方式,对此方法成形过程进行了分析,对影响成形的关键工艺参数后张力、模具间隙、模具圆角、带材厚度等进行了数值规律研究,并通过试验的方式,对模拟结果进行了验证。该成形方法在传统压弯基础上对带材两侧施加以张力,并通过正反向弯曲,改善了制件的残余应力状态,提高了构件的稳定性。
The excellent performance of constant force springs depends on the natural curvature of each position and other characteristics. In the current forming process, the stability of the constant force spring is limited by its own geometric shape, showing the natural diameter of the outer layer is greater than the deviation of the inner layer , Affecting the accuracy of constant force spring. In order to overcome the difficulty of this process, the concept of tension-compression composite continuous bending is proposed for forming such components. The forming process of this method was analyzed by means of numerical simulation. The numerical laws of the key process parameters such as post-tension, die clearance, die fillet, strip thickness and so on were studied. Through the experiment, The results have been verified. The forming method applies tension to both sides of the strip material based on the traditional bending and bending and improves the residual stress state of the workpiece through positive and negative bending to improve the stability of the component.