磨削参数对硬质合金刀片圆弧表面锯齿的影响

为了控制硬质合金刀片圆弧刃处的表面质量，通过分析单颗磨粒与工件的接触长度和最大未变形切屑厚度的关系，建立了其磨削力学模型.基于正交试验的方法，对该硬质合金刀具进行不同磨削参数的加工实验，并采用VHX-600超景深光学显微镜等观测仪器对刀具圆弧面的锯齿深度和表面粗糙度进行观测.结合圆弧刀刃的磨削力学模型和实验加工结果，并基于锯齿成型机理分析了不同磨削参数、刀片材料以及结构等对刀片圆弧的锯齿及粗糙度的影响规律.结果表明，提高砂轮转速、降低圆弧转动速度、减小磨削深度、控制刀片材料的质量、合理设计刀片结构可以提高刀片圆弧处的表面质量，提高刀具的耐用度.砂轮磨削圆弧转动速度为24 m/s、圆弧转动速度为8 °/s、磨削深度为0.05 mm时磨削效果较佳，可以获得较小的磨削力、锯齿深度及表面粗糙度.

Effect of Grinding Parameters on Saw Tooth of Arc Surface of Cemented Carbide Blades

In order to control the surface quality of arc edge of the cemented carbide blade, a grinding mechanical model was established by analyzing the relationship between the contact length of a single abrasive particle and the work-piece and the maximum thickness of undeformed chip. Based on the orthogonal experiment method, the machining experiments of the carbide tool with different grinding parameters were carried out, and the saw tooth depth and surface roughness of the tool arc surface were observed by VHX-600 ultra-deep field optical microscope and other observation instruments. Based on the grinding mechanical model and experimental machining results of the arc blade, as well as the saw tooth forming mechanism, the saw tooth and roughness of the arc blade affected by different grinding parameters, blade material and structure were analyzed. The results show that the surface quality and tool durability can be improved by increasing wheel speed, reducing arc rotation speed, reducing grinding depth, controlling the quality of blade material and designing blade structure reasonably. The grinding effect is better when the grinding speed of the wheel is 24m/s, the speed of the wheel is 8°/s, and the grinding depth is 0.05mm, and meanwhile, the grinding force, serrations and surface roughness are smaller.