高精度保持性QT600-3横梁的铸造技术

High Precision Retaining QT600-3 Beam Casting Technology

从横梁结构刚度的有限元分析、铸造变形数值模拟、熔炼处理工艺及时效处理等方面介绍了高精度保持性QT600-3横梁的铸造技术,T型模拟导轨试样和横梁铸件的直线度测量结果表明:提高材料的弹性模量,有利于减小横梁变形;采用较高的CE、复合合金化、低的打箱温度和振动时效,可获得弹性模量≥160 GPa、残余应力≤50 MPa的高刚度低应力的QT600-3横梁;经过6个月,高刚度低应力的#2试样直线度变化量明显小于低CE高强度的试样;高刚度低应力球墨铸铁横梁的直线度为24.0μm,经过1年后为27.6μm,变形量仅为3.6μm,高CE高刚度低应力的球墨铸铁横梁铸件具有较高的精度和较小的变形。

The casting technology of the high-precision QT600-3 cross beam was introduced front the aspects of finite element analysis of beam stiftitess,numerical simulation of casting defbrmation,smelting process attd aging treatment. Straighmess measm＇enmnt results for T-type analog guide rail specimens and beam castings showed that：Increasing the elastic modulus of the material was beneficial to reduce the beam defbrmation. Using high CE,composite alloying,low boxing temperatm＇e and vibration aging,stress QT600-3 beam could be produced with the high stiffiless and high elastic modulus greater or equal to 160 GPa and residual stress lower than or equal to 50 MPa. After 6 months,the straightness variation of the #2 specimen with high stiffiless and low stress was significantly lower than that of the specimen with low CE and high strength,the straightness of the high-rigidity and low-stress nodular iron beam was 24.0 μm,which was 27.6 μm after 1 year. The defbrmation amount was only 3.6 μm. High CE high-rigidity and low-stress nodular iron beam castings had higher accuracy and less defbrmation.