【作者】 傅玉灿； 徐鸿钧； 徐九华； 孙方宏；

【Author】 Y.C. Fu, H.J. Xu, J.H. Xu, F.H. SunCollege of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, ChinaCollege of Mechanical Engineering, Shanghai Jiaotong University, Shanghai, China

【机构】 南京航空航天大学机电学院； 上海交通大学机械工程学院；

【摘要】 本文采用基体开槽形式的CBN砂轮并辅以磨削弧区射流冲击强化冷却,有效地消除和抑制了采用普通磨料砂轮磨削时磨料与钛合金之间的化学亲合作用,大幅度地提高了磨削液的冷却换热效果。电镀CBN开槽砂轮缓磨钛合金(TC4)的实验对普通切向、砂轮内出水射流以及磨削弧区定向射流等不同供液方式的冷却效果进行了全面的对照比较,实验结果表明磨削弧区定向冲击冷却可在普通供液时钛合金工件早已严重烧伤的条件下,将工件表面温度控制在磨削液发生成膜沸腾的临界温度约120～130℃以下。该项研究为工业化生产中从根本上改善钛合金的磨削加工性提供了科学依据和实践方法。更多还原

【Abstract】 In order to improve the grindability of titanium alloys, the inhibition of the chemical affinity between the abrasive and titanium alloys and cooling enhancement in grinding zone are carried out in the paper. Slotted Electroplated CBN grinding wheels with optimum topography are used, and different grinding fluid supply systems such as conventional tangential spraying coolant supply, inner chamber coolant jet impinging, radial high-pressure jet impinging are employed in creep feed deep grinding experiments on titanium alloy (TC4). The experimental results show that high-pressure jet impinging has remarkable cooling effect. The temperature of the workpiece surface can be steadily kept below the critical film boiling temperature 120-130℃, while the workpiece surfaces is badly burnt with conventional coolant supply. The study will exploit an important research orientation that has great potential in high efficiency grinding. Further perfection of this study will not only enable us to increase the available material removal rate to a new level but also solve the workpiece burn problem of the difficult-to-machining materials in high efficiency grinding.更多还原