微观组织和织构对 H65黄铜带材折弯性能的影响
2021-05-24莫永达张嘉凝白依可王云鹏王虎娄花芬
莫永达 张嘉凝 白依可 王云鹏 王虎 娄花芬



摘要:电子产品关键部件小型化对黄铜合金带材折弯性能提出了更高的要求。研究了微观组织和织构对 H65黄铜带材折弯性能的影响规律和影响机制。结果表明:带材平行于轧向折弯较垂直于轧向折弯更易于产生表面褶皱和裂纹,且随着折弯半径的减小,折弯性能降低。折弯变形过程中带材外表面易形成剪切带,所产生的剪切变形是造成表面褶皱和开裂的主要原因。微观组织不均匀、较强的 Brass 织构易导致带材折弯过程中产生剪切变形,造成带材折弯性能下降。通过调控热处理工艺来调整带材织构,减少或抑制剪切带的产生,能够提升带材的折弯性能。
关键词:黄铜带材;折弯性能;微观组织;织构
中图分类号: TG 146.4 文献标志码: A
Effects of Microstructure and Texture on Bending Properties of H65 Brass Sheet
MO Yongda1,2, ZHANG Jianing1,2, BAI Yike1,2, WANG Yunpeng1,2, WANG Hu1,2, LOU Huafen1,2
(1. China Copper Institute ofEngineering and Technology, Beijing 102209, China;2. Kunming Metallurgical ResearchInstitute Co., Ltd., Beijing Branch, Beijing 102209, China)
Abstract: The miniaturization of electronic products key components puts forward higher requirements for the bending properties of brass alloy strip. The effects of microstructure and texture on the bending properties of H65 sheet strip were studied. The results show that the bending parallel to the rolling direction is easier to produce surface wrinkle and cracks compared with the bending perpendicular to the rolling direction, and the bending properties decreases with the decrease of bending radius. In the process of bending deformation, shear bands are easy to form on the outer surface of the sheet, and the resulting shear deformation is the main cause of surface wrinkles and cracks. The non-uniform microstructure and strong brass texture are easy to cause shear deformation, resulting in the decline of sheet bending performance. It can improve the bending properties of the sheet by adjusting the heat treatmen process parameters to adjusting the sheet texture and reducing or inhibiting the generation of shear bands.
Keywords: brass sheet; bending properties ; microstructure ; texture
隨着通信、汽车和电气行业的不断发展,对连接器用铜带材也提出了更高的要求[1-2]。如电线束接插件产品,要求所用铜带材同时兼顾冲压时的塑性、插拔时的强度和弹性要求。此外,随着接插件产品往小型化和轻质化方向发展,客户对铜带产品的弯曲条件也更加严格[3-4]。连接器用铜带材一般为锡磷青铜带和 H65黄铜带材,出于成本考虑,近年来连接器用高性能低成本黄铜带材已成为重要的发展趋势。常规的黄铜带材虽然满足高抗拉强度和高伸长率指标,但其折弯性能仍存在较大的提升空间[5]。因此,有必要对黄铜带材折弯性能的影响规律和影响机制开展研究,在此基础上提出改善黄铜带材折弯性能的控制建议。……
