PASX410分流器精密铸造工艺研究

Investment Casting PASX410 Flow Divider

PASX410分流器铸件材质为SUS440马氏体铸造不锈钢,铸件形状为空芯圆环状,内部有8条筋8个孔,形状复杂。在生产制造过程中,通过蜡模使用尿素芯成形工艺和模具研究试验,发现蜡模生产率低、废品率高。为此,对蜡模成形工艺进行了进一步的研究:重新设计了蜡模结构,确定了蜡模上下两体单独设计制造,然后组合装配的工艺方法。为保证上下体蜡模定位制造精度和互换性,模具设计采用了特殊设计制造方法;蜡模组装使用蜡溶剂、修补剂等工艺,保证了蜡模的装配可靠性和精度;对型壳制造、浇注工艺制订了严格的控制方法,使铸件达到了设计要求。

PASX410 flow divider is made of SUS440 stainless steel,whose shape is hollow ring structure with eight ribs and eight holes in the inner,exhibiting complicated shape.Wax pattern with CO（NH2）2 core shows low production rate and high waste rate.Wax pattern structure was re-designed.Up-part and down-part of the wax pattern were made,respectively,and then they were assembled together.Special designing and manufacturing method was adopted to ensure the location accuracy and interchangeability of up-part and down-part pattern.Through using wax solvent and repairing agent in wax assembling,assembling reliability and precision were ensured.In addition,mold shell baking and pouring process were strictly controlled.Through above measures,investment casting PASX410 flow divider met the designed requirements.