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大口径厚壁焊管机械扩径生产

发布时间:2021/3/1 10:38:30人气:39

  大口径厚壁焊管机械扩径形变剖析

  大口径厚壁焊管在机械扩径加工工艺中,扩径模貝扇型块在原始时处在收缩情况,扩径前模貝工作中表层与管料里侧留出的空隙。扩径逐渐后,扩径头功效于模貝扇型块使其沿轴向移位,彼此之间趋向分离出来情况,模貝外接圆规格慢慢增大。一段空行程安排后,模貝工作中表层先与管料内表层在椭圆短轴侧相触碰。依据模貝工作中表层弧形段的直徑与管料內径的比率不一样而分二种状况,当比率超过1时,模貝边沿圆弧处先与管料內径触碰,当比率低于1时,则先在模貝工作中弧形正中间部位触碰。扩径模貝与管料触碰后,模貝对管料释放轴向荷载,使管料历经整圆、扩径全过程而陆续产生延展性和塑性形变。在有限元分析中,该全过程主要表现为授予刚度模貝轴向偏移时,变形体由弹性变形慢慢进到塑性形变。

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