我厂生产几种短管,其形状尺寸见图1所示。如一箱放一个短管,则生产率低、型砂用量大,生产成本高。因此,每箱安放二个短管,其安排如图2所示。(双点划线为短管示意图)。泥芯是湿砂芯。泥芯骨做成如图2中实线部分所示的形状结构,用钢管焊接而成,骨架用φ32mm的旧钢管,插齿用φ20mm的旧钢管,在A处做成动配合的,间隙为0.6mm。清砂时,只要轻轻敲打就很容易将泥芯骨取 I plant several short tube, the shape and size shown in Figure 1. If put a short tube in a box, the productivity is low, the amount of sand used, the high cost of production. Therefore, two short tubes are placed per box, as shown in Figure 2. (Double-dotted line for the short tube diagram). Mud core is a wet sand core. Mud cored bar as shown in Figure 2, the solid line part of the shape and structure shown, with steel welded together, the skeleton with φ32mm old steel pipe, gear with φ20mm old steel pipe, made at A dynamic fit, the gap is 0.6mm. Clear sand, as long as the tap is easy to take mud core bone