Hole making characteristics of novel domestic T800 carbon fiber reinforced composite

Abstract

In view of the defects of the new domestic T800 carbon fiber reinforced plastic （CFRP）, such as lamellar tearing and fiber loss, which would be easily caused by large drilling force and torque during cutting, an experimental platform including a vertical ultrasonic machining center and force measurement system was constructed. Carbide twist drill, carbide candle stick drill and carbide dagger drill were used to compare the hole quality of T800 carbon fiber composite. Under the same technological parameters, the influences of three kinds of cutting tool structures on the cutting force, surface morphology of hole inlet and outlet, aperture deviation and surface roughness of T800 composite were compared with those of conventional drilling （CD）. The ultrasonic vibration assisted drilling （UVAD） method was adopted to carry out feasibility experiments on optimum tool structure. The results show that the carbide dagger drill can effectively suppress the surface defects of T800 composite materials, but the entrance aperture accuracy is poor. The ultrasonic vibration assisted dagger drilling can further improve the quality of hole making, especially significantly improve the aperture accuracy by improving the drilling stability.

Keywords

• t800
• composite material
• ultrasonic vibration assisted drilling
• dagger drill
• machining accuracy