Tool wear and its effect on surface roughness in diamond cutting of glass soda-lime
Tool wear and its effect on surface roughness in diamond cutting of glass soda-lime
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DOI：
10.3901/cjme.2012.06.1224
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发表时间：
2012-10
影响因子：
4.2
通讯作者：
P. Jia;M. Zhou
中科院分区：
文献类型：
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作者：
P. Jia;M. Zhou
对于光学玻璃的金刚石切削技术，刀具磨损率高是阻碍该技术实际应用的一个主要原因。许多关于玻璃切割中金刚石工具磨损的研究都停留在对磨损现象的简单描述上，没有分析磨损现象的成因，也没有从力学上解释工具磨损的形成过程。为了深入了解金刚石切削玻璃时的刀具磨损及其对表面粗糙度的影响，对钠钙玻璃进行了渐增切削距离的金刚石车削实验。检测了前刀面和后刀面的磨损形貌、相应的工件表面特征和表面粗糙度，以及后刀面磨损区的材料成分。实验结果表明，金刚石切削玻璃的后刀面磨损以后刀面磨损为主，后刀面磨损区以微沟槽为主，前刀面上也有光滑的弹坑。当切削距离超过150 m时，由于刀具磨损加剧，切削方式由韧性向脆性转变，表面粗糙度开始迅速增大。金刚石切削玻璃时刀具磨损的主要机理是扩散、机械摩擦、热化学作用和磨粒磨损。从磨损机理上对金刚石切削玻璃时刀具磨损及其对表面粗糙度的影响进行了分析和研究，为金刚石切削光学玻璃等脆性材料时刀具磨损的最小化提供了理论依据。
For the technology of diamond cutting of optical glass, the high tool wear rate is a main reason for hindering the practical application of this technology. Many researches on diamond tool wear in glass cutting rest on wear phenomenon describing simply without analyzing the genesis of wear phenomenon and interpreting the formation process of tool wear in mechanics. For in depth understanding of the tool wear and its effect on surface roughness in diamond cutting of glass, experiments of diamond turning with cutting distance increasing gradually are carried out on soda-lime glass. The wear morphology of rake face and flank face, the corresponding surface features of workpiece and the surface roughness, and the material compositions of flank wear area are detected. Experimental results indicate that the flank wear is predominant in diamond cutting glass and the flank wear land is characterized by micro-grooves, some smooth crater on the rake face is also seen. The surface roughness begins to increase rapidly, when the cutting mode changes from ductile to brittle for the aggravation of tool wear with the cutting distance over 150 m. The main mechanisms of inducing tool wear in diamond cutting of glass are diffusion, mechanical friction, thermo-chemical action and abrasive wear. The proposed research makes analysis and research from wear mechanism on the tool wear and its effect on surface roughness in diamond cutting of glass, and provides theoretical basis for minimizing the tool wear in diamond cutting brittle materials, such as optical glass.