我厂铸造的蔴纺机头道梳蔴机的齿轮面大圈(图1),要四面完全出白加工,决不能有砂眼.起先,浇口用顺流旋转式的,里外各开了两个冒口,但浇出来的铸件上砂眼很多,尤其在甲处(见图1)更甚.后来改用顺逆流旋转式的浇口(图2),并在甲处加上 I plant casting Hemp machine Road comb machine gear surface large circle (Figure 1), to be completely white on all sides of processing, must not have trachoma.First, the gate with downstream rotation, inside and outside each opened Two risers, but cast out of the castings on a lot of trachoma, especially in the A (see Figure 1) even more. Then switch to the countercurrent rotary gate (Figure 2), and in a