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我们曾承制过一批铁球,直径100公厘,材料将球墨铸铁。铁球是用作退火炉25吨平车拖动时的滚珠,因此要求硬度高,耐磨耗,表面上不得有砂眼和缩孔等缺陷。我们先后试浇了十多次都失败了,无论改浇口、冒口以及下冷铁等,全都没有效果,主要的缺陷是有缩孔。后来大家肯定这种铸件一定要用离心铸造法铸造才好。技师柳世才同志提出一种简易的离心铸造法,方法极为简便,而且一般车间都可采用。铁球自采用这种方法浇铸后,完全避免了缩孔。
We have undertaken a number of iron ball, diameter 100 mm, the material will be ductile iron. Iron ball is used as annealing furnace 25 tons of flat towing the ball, so the requirements of high hardness, wear resistance, the surface shall not have trachoma and shrinkage and other defects. We tried pouring more than ten times and failed. No matter if we changed the gate, the riser and the chilled iron, we all had no effect. The main defect was shrinkage. Later, we are sure that this casting must be cast by centrifugal casting method. Technician Liu Shicai proposed a simple centrifugal casting method, the method is extremely simple, and the general workshop can be used. Iron ball since the use of this method of casting, completely avoiding shrinkage.