Trial manufacture of an equipment for removal of inclusion particles from molten metal by pinch force

残留在最终金属制品中的夹杂物颗粒会导致各种缺陷，如钢材中的细条。本研究的目的是发展一种利用交流夹紧力将夹杂物从液态金属中分离出来的方法。1.研究了球形颗粒在电磁场中的行为。在玻璃槽内的KCI水溶液中，同时施加交变磁场和交变磁场，向下施加均匀的电磁力。然后将密度大于液体的聚苯乙烯球形粒子加入KCI溶液中，调节电流，使作用在粒子上的电磁力和重力达到平衡。由直流电磁力理论估算的力之间的平衡条件与观测结果吻合较好，因此直流力理论适用于AC-…。更多的力场。2.使用汞的模型实验(1)夹紧力压力的测量：用压力计方法测量水银柱体中夹紧力产生的压力。(2)水滴与汞的分离：从一个装有汞的垂直玻璃圆筒底部注入一个水滴，并在其中施加交流电，测量水滴到达玻璃墙的垂直位置。不同电流下的这些位置与理论估计相符。3.锡中夹杂物的分离首先，研究了锡中氧化物颗粒的悬浮方法。最有效的方法是将压实的TiN和ZrO_2粉末混合物放入液体TiN和ZrO_2粉末混合物中，在搅拌罐中大力搅拌。然而，镀锡液中只有0.05%的ZrO2粉末残留。需要在今后的研究中继续改进。其次，将TiN熔体悬浮的氧化锆粉倒入玻璃圆筒中，施加交流电。根据对锡中氧的化学分析，观察到的分离效率约为70%。由于氧化物粉末在液态金属中的产率较小，无法在流动系统中进行分离实验。较少

Inclusion particles which remain in final metal products cause various defects like slivers in steel products. The purpose of the present study is to develop a method for inclusion separation from liquid metal by the use of AC-pinch force. The following studies have been made :1.Investigation of the behavior of a spherical particle in an electromagnetic force fieldA uniform electromagnetic force in the downward direction was imposed in a KCI-aqueous solution contained in a glass cell in which an alternating current and AC magnetic field were simultaneously imposed. A polystirene spherical particle having larger density than liquid was then put into the KCI solution and the current was regulated so as to make electromagnetic force balanced with gravity force acting on the particle. The estimated balancing condition between these forces obtained from the DC-electromagnetic force theory agreed well with the observed results, and hence, the DC-force theory was found to be applicable to AC- … More force field.2.Model experiments by the use of mercury(1)Measurement of pressure due to pinch force : Pressure due to pinch force in a mercury cylinder was measured by a manometer method. The estimated and measured values agreed well with each other for various currents.(2)Separation of water drop from mercury : A water drop was injected from the bottom of a vertical glass cylinder containing mercury in which an alternating current was imposed and the vertical position where the drop reached the glass wall was measured. These positions for various currents agreed with theoretical estimations.3.Separation of inclusions from liquid tinFirstly, the method for suspending oxide particles in liquid tin was investigated. The most effective method was to put compacts of tin and ZrO_2-powder mixture into a liquid tin and Zro_2-powder mixture into a liquid tin vigorously stirred in an agitation vessel. However, only 0.05% powders of ZrO_2 remained in the tin bath. Improvement should be pursued in the future study. Secondly, the tin melt suspending ZrO_2 powder was poured into a glass cylinder and an alternating current was imposed. The separation efficiency observed was about 70% based on the chemical analysis of oxygen in tin. The separation experiment in a flow system could not be made because of the small yield of oxide powder in liquid metal. Less