图甲的泥芯撑制造起来比較复杂。后來改用如图乙的冲压方法,做成图丙形状的泥心撑。这样改进后不但能严格保持平行,同时比以前提高了效率20倍。目前苏联有些工厂采用图丁所示泥芯撑,也是用冲压方法做成,同样大小的泥芯撑如图丁,比图丙形状的泥芯撑还可以节省金属。 Tujia mud core brace to create more complicated. Later switched to stamping method as shown in Figure B, making the shape of Figure C mud heart brace. This improvement not only strictly parallel, but also improve efficiency 20 times than before. At present, some factories in the Soviet Union use mud core support shown in Figure D, which is also made by stamping method. The same size of mud core support as shown in Figure D can save metal than the mud core support in Figure C shape.