SiCp/Al超声辅助扩孔微钻削的切削特性与试验研究

Cutting State Analysis and Experimental Study of SiCp/Al Reaming Combined with Ultrasonic-Assisted Micro Drilling

SiCp/Al的硬脆性使其在微孔钻削中很难形成高质量表面,且孔出口崩边严重。提出在扩孔钻削的基础上施加轴向超声辅助对SiCp/Al进行微钻削加工。文章分析了超声辅助微钻削的断续切削条件以及主切削刃与横刃在微钻削过程中的切削状态,采用传统钻削,超声辅助钻削,扩孔钻削,扩孔超声辅助钻削等四种切削工况分别加工f0.9mm,2mm深的通孔,对比微孔钻削力、孔壁质量和孔出口质量。结果表明:施加轴向超声辅助微钻削对孔的内壁质量有较明显改善,但崩边情况仍然严重。扩孔加工可有效抑制孔出口的崩边情况,但在同等参数条件下孔内壁质量比超声辅助钻削所得孔壁质量差。相比其他工况,利用超声辅助扩孔钻削加工所得的孔的综合质量最高。

The hard and brittle nature ofSiCp/Al makes it difficult to form a high-quality surface in micro-hole drilling,and the hole exit is severely chipped.The micro-drilling of SiCp/Al with the axial ultrasonic assist is proposed on the basis of reaming drilling. It analyzes the intermittent cutting condition of ultrasonic assisted micro-drilling and the cutting condition of main cutting edge and cross edge in the process of micro-drilling. Conventional drilling,ultrasonic-assisted drilling,reaming drilling,and reaming ultrasonic-assisted drilling The four cutting conditions such as cutting process through-holes with a diameter of0.9mm and a depth of 2mm,respectively,and compare the micro-hole drilling force,hole wall quality and hole exit quality. The results show that the application of axial ultrasonic-assisted micro-drilling has significantly improved the quality of the inner wall of the hole,but the chipping is still serious. The reaming process can effectively suppress the collapse of the hole exit,but under the same parameters,the quality of the inner wall of the hole is worse than that obtained by ultrasonic-assisted drilling. Compared with other working conditions,the comprehensive quality of the holes obtained by ultrasonic-assisted reaming drilling is the highest.