往复式压缩机缸套制作材料的新选择——连铸空心型材

Continuous Casting Hollow Profile:A New Choice for Production of Reciprocating Compressors Cylinder Liner

垂直上引连续铸造的铸铁空心型材,从其凝固结晶的机理上杜绝了传统铸造难以避免的气孔、砂眼、夹渣、缩松等缺陷,又因冷却速度极大而获得了细密的铸态组织,其共晶团体积仅有传统铸件的1/8～1/10,而晶界面积增加了4倍以上。这些特征致使连铸型材具有"高致密、零缺陷、强韧兼备"之特点,并使其抗磨损性能显著提高。运用连续铸造的球铁空心型材制作的氮氢气压缩机第5级气缸套,与离心铸管制造的缸套的对比试验结果表明,使用寿命提高了一倍以上。

The vertical upward distraction continuous casting cast iron hollow profile can prevent the Blowhole, sand inclusion, slag inclusion, shrinkage porosity in the aspects of crystallization principle. It gets fine casting structure since considerable cooling rate. The eutectic cell volume is 1/8-1/10 compared with traditional casting. While the grain boundary area is increased by 4 times. The properties made the continuous casting hollow profile ＂high density, zero defect, both high toughness and strength＂. And its antiwear ability increases significantly. The technology was applied in the production of the fifth level cylinder liner of nitrogen-hydrogen compressor madey with ductile iron hollow profile. The service life doubled compared with the components made by centrifugal casting pipe