基于大刃倾角刀具的玻璃切削加工机理

针对功能玻璃硬度高、脆性大、容易在已加工表面产生裂纹和凹坑的特性,提出基于大刃倾角刀具的玻璃切削加工方法.该方法能在亚毫米级的切削深度下高效地获得无裂纹和凹坑的完整表面.文中分析了大刃倾角刀具切削玻璃的机理以及刀具参数、切削用量对已加工表面质量的影响.实验结果表明:大刃倾角刀具切削玻璃时,表面粗糙度R_a达0.21μm,表面完整性优于传统的玻璃精磨时的表面;要获得较好的已加工表面质量,刀具参数和切削用量都存在一个较佳的取值范围.

Mechanism of Glass Cutting by Using Single-Straight Tool with Big Inclination Angle

Functional glasses are mainly hard and brittle, and are difficult to machine because cracks and concavities are easily form on the machined surface. In order to solve this problem, a glass-cutting process by using a single-straight tool with big inclination angle is proposed, which helps to obtain integral surface without cracks and conca-vities in a cutting depth at sub-millimeter level. The corresponding cutting mechanism, as well as the effects of tool parameters and cutting parameters on the surface quality, is then analyzed. Experimental results indicate that, by using the single-straight tool with big inclination angle, the roughness R_a of machined surface is less than 0.21μm and the integrity of the surface is better than that of the surface machined by the conventional precision grinding, and that there exist suitable ranges of tool and cutting parameters for high-quality machined surface.