我厂生产的100HW-12涡壳式混流泵叶轮结构如图1所示,图2是该叶轮的铸造工艺简图。过去,我们在造型时,根据混流泵叶片的结构特点,采取通常的抽片方法硬性取出实样叶片模,型腔的形状和尺寸易发生变形,铸出的叶轮不能满足质量要求;若将砂芯一分为二(见图3),合型时极易造成错芯,而且,在芯头连接处还易产生披缝,从而影响叶轮表面的粗糙度;后来,我们曾采用熔模铸造法生产叶轮,叶轮性能良好,但 I plant 100HW-12 Turbidimeter Francis pump impeller structure shown in Figure 1, Figure 2 is the impeller casting process diagram. In the past, when modeling, according to the characteristics of the structure of the mixed flow pump blades, take the usual method of pumping hard to remove the real blade mold, the shape and size of the cavity is easy to deformation, the casting of the impeller can not meet the quality requirements; if the sand Core divided into two (see Figure 3), when combined can easily lead to the wrong core, but also easy to produce in the core junction of the seam, thus affecting the surface roughness of the impeller; Later, we have used investment casting Production of impeller, impeller performance is good, however