双金属银合金铸件工艺设计及缺陷研究

Study on Casting Process Design and Defect of Bimetallic Silver Alloy

针对银合金双金属封严圈铸件生产过程中经常出现的夹渣缺陷进行研究,通过重点控制感应加热过程,减少可能出现的夹渣缺陷;采用感应线圈加热水冷成型工艺,制备了组织良好,理化性能达到要求的铸件。结果表明,零件夹渣缺陷最少的最佳工艺参数为感应加热温度:815±5℃,感应电压:350±10 V;运用粘性理论分析获得了人工搅拌的最佳位置和最佳方法;在保证感应加热温度前提下,应降低感应频率,使熔剂更容易上浮,达到减少夹渣缺陷的目的。

The slag inclusion defects often occur in the process of silver alloy bimetal sealing ring casting production was studied. By controlling induction heating process, slag inclusion defect can be reduced. The castings with good microstructure and physical and chemical properties were prepared by induction coil heating and water-cooling process. The results show that the slag inclusion defect parts at least one of the best technological parameters for induction heating temperature is 815±5 ℃, the induced voltage is 350±10 V;The optimum position and method of manual stirring are obtained by using viscosity theory. Under the premise of ensuring the induction heating temperature, the induction frequency should be reduced to make the flux float more easily to achieve the goal of reducing slag inclusion defects.