钻削飞机钛合金结构维修孔的钻头横刃优选试验

Optimum Experimental Study on Drill Chisel of Drilling Aircraft Titanium Alloy Structure Maintenance Hole

针对飞机钛合金薄壁结构维修工艺孔的手工钻削特点,选取了三种不同横刃形状的麻花钻头,通过所构建的微量复合油雾喷射润滑(CMJ)条件下的钻削试验系统,开展了钻头横刃形状对钻削性能影响的对比试验,优选出适合战伤抢修环境下使用的飞机钛合金蒙皮钻削的钻头形状,以期提高飞机钛合金结构的修理质量和效率。试验表明,横刃形状为S型钻头最适合飞机钛合金薄壁结构维修工艺孔钻削,虽然S型和短横刃型的钻头均可有效降低钻削轴向力,提高孔口圆度,但短横刃钻头因横刃区域面积小,磨损较为严重。

Aiming at the hand drilling characteristics of structure maintenance hole on aircraft Titanium alloy thin- wailed structure,three twist drills with different chisel shapes are selected. Through the drilling test system under CMJ con- dition,in order to improve the quality and efficiency of aircraft Titanium alloy repairs, a comparative test on the influence of drill chisel shape on drilling performance is conducted, and the shape of drill bit suitable for the drilling of aircraft Titanium alloy used in war damage repair is optimized. Experiments show that the drill of S-shaped chisel is the most suitable for the drilling of Titanium alloy thin-walled structural maintenance holes in aircraft. Although the S-type and short-chisel type drills can effectively reduce the axial force of drilling and improve the roundness of the orifice, however, the short chisel drill due to horizontal edge area is small,more serious wear and tear.