煤车用的铸钢碰头(见图1)用砂型铸造时,材料消耗高,生产效率低。我厂从1978年试用金属型铸造工艺,收到良好效果。金属型(见图2)由上、下模板、弧形块、端面模组成。弧形块与端面模用止口定位,金属型用楔形木(铁)紧固,操作方便,紧固可靠。型芯及浇口圈均用水玻璃砂制造。浇口圈与上模板用倒锥配合,以利脱模。一箱两件,砂 Casting steel car meet with coal (see Figure 1) sand casting, the material consumption is high, the production efficiency is low. I plant from 1978 trial metal casting process, received good results. Metal type (see Figure 2) from the upper and lower template, arc block, the end module. Arc block and end die with the mouth positioning, metal type with wedge wood (iron) fastening, easy to operate, reliable fastening. Core and gate ring are made of water glass sand. Sprue ring and the template with the inverted cone to facilitate the demoulding. A box of two, sand