中文摘要：

为减小飞行阻力和增强雷达散射，提出采用精密磨削和微细磨削组合加工工艺在陶瓷飞行体表面加工出曲面微沟槽结构。首先，利用精密修整后的金刚石砂轮圆环形端线沿数控曲线插补轨迹将陶瓷加工成光滑曲面，然后利用微细修整成角度为60^ο的金刚石砂轮v形尖端在曲面上沿飞行体轴向方向加工出微沟槽结构，最后通过风动试验分析不同曲面结构对空气阻力的影响。磨削试验结果显示，精密磨削和微细磨削组合加工可在高度32mm、直径30mm和表面粗糙度0．262岬的陶瓷曲面上加工出深度为578～581μm、角度为61．56^ο。和尖端半径为48μm的微沟槽结构，其深度误差仅为3μm，曲面加工的平均形状误差为142lμm，加工精度可控制在0．5％以内。此外，加工后的陶瓷表面粗糙度主要受砂轮粒度和磨削工艺的影响。风动试验结果表明：微沟槽结构曲面分别比光滑和粗糙曲面减小轴向阻力约36％和42％，也比光滑曲面减小侧面阻力约39％。因此，陶瓷飞行体的光滑曲面被加工出规则可控的微沟槽结构可以减小飞行阻力。

英文摘要：

In order to reduce flight resistance and increase radar scattering, a hybrid method of precision grinding and micro grinding is proposed to fabricate micro-grooves curved surface structures on surface of ceramic flying body. The precision-trued diamond wheel edge is employed to grind ceramic surface into smooth curved surface along CNC curve interpolation paths; the micro-trued diamond wheel with V-tip of 60^ο is employed to grind micro-grooves structures on ground curved surface along the axial direction of flying body; the wind-driven experiments are performed to investigate the effect of different curved surface structures on air resistance. The experimental results show that micro-grooves structures with the depth of 578-581 μm, angle of 61.56^ο and tip radius of 48μmmay be fabricated on curved surface of ceramic with the height of 32 mm, diameter of 30 mm and surface roughness of 0.262 μm. The depth error of micro-grooves is only 3 μm The average form error of curved surface is only 142 μm and it can be controlled below 0.5% by the proposed precision grinding method. Moreover, different grain sizes of diamond wheel and various grinding processes have great influence on surface roughness for curved surface of ceramic. The wind-driven experimental results indicate that micro-grooves structure may reduce axial resistance by 36% and 42% compared to smooth and rough curved surface, respectively. The micro-grooves structure may also reduce lateral resistance by 39% against smooth curved surface. It is confirmed that the regular and controllable micro-groove structures machined on smooth curved surface of ceramic flying body may reduce flying resistance.