High Accuracy and Good Stability of HT300 Gray Iron Lathe Body Casting

摘要：

　　Manufacturing technology of high-rigidity low-stress gray iron HT300 was presented.A T-type lathe bedway sample was designed,and the T-type bedway samples and the lathe body castings of horizontal machining center were made using this new manufacturing technology and the traditional manufacturing process.Detection of physical and chemical index,test of residual stress and measurement of rail straightness were done.The key production technology of gray iron HT300 lathe body casting that has high precision of retention was studied.Results show that it is an effective approach to obtain high tensile strength(≥ 300 MPa),high elasticity modulus(≥ 120 GPa)and low residual stress(≤ 20 MPa)HT300 gray iron by 0.5-0.7%Cu,0.2-0.3%Cr,0.035-0.05%Sn compound alloying and “multi-step temperature rising/falling” heat aging under higher carbon equivalent(3.7-3.8%)condition and lower shakeout temperature(≤ 250 ℃).After a year,the deformation of 1 # and 2 # T-type lathe bedway samples is 24.5 μm and 22.1 μm,respectively,and the latter is 9.8%smaller than the former.Relatively,the low carbon equivalent high strength 1# lathe body casting,the high carbon equivalent high strength and low stress 2# lathe body casting have smaller guideway deformation,higher precision and precision retaining ability.

关键词： carbon equivalent machine tool castings rigidity residual stress straightness

作者: Dong-hai Wei Ke-rui Li Xian-long Wu Chun-rong Li

作者单位: Zhengzhou Research Institute of Mechanical Engineering,Zhengzhou 450001,China Shenyang Machine Tool Yinfeng Foundry Co.,Ltd.,Shenyang 110200,China

会议类型: 国内会议

会议名称: 第十二届中国铸造协会年会暨全球首届铸造论坛、第六届中国金砖国家铸造业论坛

会议地点: 北京

会议语种:英文

页码: 37-44

在线出版日期: 2016-05-14（万方平台首次上网日期，不代表论文的发表时间）