以下为句子列表：
英文: Based on pressing practical experience of EHA4120 double-faced clad plate elliptical head, the type head external surface clad layer crack reason during pressing process were analyzed and discussed, and the head pressing task was fulfilled successfully th
中文: 摘要根据EHA4120双面复合板椭圆封头的冲压实际经验，分析探讨了此种封头在压制过程中外表面复合层产生裂纹的原因，通过改进压制工艺，成功地完成了封头的压制任务。
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