6吨台车铸钢摇枕由於设计的形状很像一根拉力试验棒。浇铸後在冷却过程中,铸件内部必然要产生很大的铸造应力:如果造型的方法与钢水的质量稍有差错,就会使铸件发生裂纹。最初由於裂纹所造成的产品,其产品率会达到90%以上,因而在很长的一段生产时间中为了降低产品率而努力,最後 6 tons of trolley cast steel bolster due to the shape of the design like a pull test rod. Casting in the cooling process, the casting will inevitably have a great casting internal stress: If the modeling method and the quality of molten steel slightly wrong, it will make the casting cracks. Initially due to cracks caused by the product, the product rate will reach 90% or more, and thus in a very long period of production time in order to reduce product rates and efforts, and finally