Ultrasonic sensor and technique for in-line monitoring of die casting process
Ultrasonic sensor and technique for in-line monitoring of die casting process
复制标题
用于压铸过程在线监测的超声波传感器和技术
DOI：
10.1088/0957-0233/12/11/327
复制
发表时间：
2001
影响因子：
2.4
通讯作者：
C. A. Loong
中科院分区：
文献类型：
--
作者：
J. Moisan;C. Jen;J. Liaw;C. Zheng;T. Chen;Z. Sun;C. A. Loong
采用埋置在压铸模中的超声波复合钢缓冲棒传感器，对以半固态（触变）和枝晶组织的铝合金坯料为原料的压铸过程进行在线监测。这种复合钢缓冲棒提供了比先前报道的复合锆缓冲棒更好的性能。一个多记录技术用于快速数据采集的速率高达0.003秒每采集。这一超声波探头监测模具填充的完成、压力的释放、模具的打开、零件的分离和零件的固化。超声在复合缓冲棒和铸件中的传播时间的变化分别与模具和铸件中平均温度的变化有关。在探头端部/铸件界面处的反射回波的所测量的幅度轮廓可以用于监测冷射和完全填充。铸件中超声衰减系数的变化还可能与成分、显微组织和气孔率的变化有关。
An ultrasonic clad steel buffer rod sensor embedded in the die has been used to in-line monitor the die casting process using aluminium alloy billets with semi-solid (thixotropic) and dendritic microstructures as feedstocks. This clad steel buffer rod provided better performance than the previously reported clad zirconium buffer rod. A multiple recording technique was used for the fast data acquisition with a rate up to 0.003 s per acquisition. This single ultrasonic probe monitored the completion of the die filling, the release of the pressure, the opening of the die, part detachment and solidification of the part. The change of the ultrasonic travel time in the clad buffer rod and cast part relates to the variation of the average temperature in the die and part, respectively. The measured amplitude profile of the reflected echo at the probe end/cast part interface can be used to monitor the cold shot and complete filling. The variation of the ultrasonic attenuation coefficient in the cast part may also relate to the change of the composition, microstructure and porosity.