Engineering ceramics are increasingly extensively applied in the aerospace, vehicle, armor protection and other fields due to their excellent performances such as high compression strength, high hardness, low density and high protection performance. However, engineering ceramics are typical difficult-to-machine materials, especially in the hole machining under constant feed rate, which limits the promotion and application. In this study, by combining a specially developed novel thin-wall diamond trepanning bit with a low-frequency axial vibration machining, the hole machining process for the constant feed rate of Al2O3 engineering ceramics was experimentally studied and the influence of the low-frequency axial vibration process on the axial drilling force, hole-wall surface roughness and edge chipping size of holes machined was analyzed. The results showed that the low-frequency axial vibration machining obtained a lower axial drilling force and a smaller edge chipping size compared to the traditional drilling process. Moreover, both the axial drilling force and the edge chipping size declined markedly with the rise in amplitude. However, the hole-wall surface roughness presented a rising trend due to the hammering effect of vibration. The process technology proposed in this article realizes the hole machining for a constant feed rate of Al2O3 engineering ceramics and provides a reference for the engineering lot-size hole machining of engineering ceramics.

中文翻译：

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Al2O3工程陶瓷恒进给率低频轴向振动孔加工研究

工程陶瓷以其高抗压强度、高硬度、低密度和高防护性能等优异性能，在航空航天、车辆、装甲防护等领域得到越来越广泛的应用。然而，工程陶瓷是典型的难加工材料，尤其是在恒定进给速度下的孔加工中，限制了其推广应用。本研究将专门研制的新型薄壁金刚石环钻钻头与低频轴向振动加工相结合，对Al2O3工程陶瓷恒进给率的孔加工工艺进行了实验研究，并研究了低频轴向振动加工的影响。分析了振动过程对轴向钻孔力、孔壁表面粗糙度和加工孔边缘崩刃尺寸的影响。结果表明，与传统钻孔工艺相比，低频轴向振动加工获得了更低的轴向钻削力和更小的刃口崩刃尺寸。此外，随着振幅的增加，轴向钻孔力和刃口崩刃尺寸均显着下降。然而，由于振动的锤击效应，孔壁表面粗糙度呈上升趋势。本文提出的工艺技术实现了Al2O3工程陶瓷等速进给的孔加工，为工程陶瓷的工程批量孔加工提供了参考。轴向钻孔力和刃口崩刃尺寸均随着振幅的增加而显着下降。然而，由于振动的锤击效应，孔壁表面粗糙度呈上升趋势。本文提出的工艺技术实现了Al2O3工程陶瓷等速进给的孔加工，为工程陶瓷的工程批量孔加工提供了参考。轴向钻孔力和刃口崩刃尺寸均随着振幅的增加而显着下降。然而，由于振动的锤击效应，孔壁表面粗糙度呈上升趋势。本文提出的工艺技术实现了Al2O3工程陶瓷等速进给的孔加工，为工程陶瓷的工程批量孔加工提供了参考。