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厚规格铝压型板辊弯成型工艺与裂纹缺陷分析

DOI: 10.3969/j.issn.1006-7043.201308031

Keywords: 压型板, 铝压型, 辊弯成型, 压下量, 裂纹, 缺陷分析

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Abstract:

厚规格铝压型板具有重量轻和比强度高等优点,也使其成型过程载荷增大、横向位移增加,成型难度增大。通过分析材料性能和成型工艺的特点,成功开发了厚规格铝压型板辊弯顺序成型工艺,给出了各道次压下规程和轧轮轴向横移量,并对少量压型板角部裂纹缺陷进行了断口SEM和EDS分析。研究发现裂纹断口是典型的微孔聚合型断裂形貌,韧窝内大多包含有夹杂物或第二相颗粒,裂纹多萌生于Al6(FeMn)等硬化相或夹杂物与基体的界面上。通过预退火处理和减慢加工速率等措施可以降低板材加工硬化、提高塑性成形能力,减少裂纹缺陷的发生。

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