Study Of Manufacturing Process For Leading Edge Of Helicopter Composite Blade

Titanium alloys are widely used in various engineering fields for their high specific strength andhigh-temperature strength within a broad temperature range, and also a high corrosion resistance inmost aggressive media. The weight and corrosion resistance of the leading edge of helicoptercomposite blade is very important for blade service life. Use titanium alloy as the blade leading edgeinstead of stainless steel can effectively reduce the weight of the blade and improve the corrosionresistance. The surface state and forming precision of titanium alloy have a great influence to thebonding performance between the titanium alloy and composite substrate.In this paper，we researched the key issues of the manufacturing process of the leading edge,such as the selection of materials, the surface treatment and the forming precision of the material. Weelected the representative material from、、 titaniumalloy, and compared sand erosionresistance of the different materials,TB8titanium alloy has some advantages, such as the good coldforming performance, the high strength after aging treatment and good fatigue performance, so it canbe the candidate materials; Using laser texturing to roughen the inner surface of the material,the inputcurrent, pulse width and defocusing amount have a great effect to the geometry parameters of theroughen point and the surface roughness of the sheet metal.With the increase of the input current andpulse width and the decrease of the defocusing amount. the diameter of the roughen point、microheight of the raised and the surface roughness of the sheet metal increases in different amplitudes;Adopting the combination of numerical analysis and experimental method,we studied the formingprocess of the titanium alloys, established the finite element model of the forming process of theTitanium alloy leading edge, analyzed the influence of mould shape and temperature to thespringback, and designed the mould, proceed the physical experiment, discusses the influence offorming temperature and holding time to the springback, determined the reasonable forming processparameters for TB8titanium alloy: At625℃, and keep the holding time to10minutes, thespringback is very small;625℃~675℃, the springback is very close; at700℃or so, thespringback is close to0.So at625℃, and consider the holding time, can be used as the actualproduction.