RESEARCH OF IMPROVEMENT OF MECHANICAL PROPERTIES OF THIN-WALLED PARTS USED IN AVIATION TECHNOLOGY

Abstract

In mechanical engineering technology, the share of surface plastic deformation (SPD) processing processes has noticeably increased recently. The great interest in SPD methods is associated with their ability to combine the effects of finishing and hardening treatment in one process, which makes it possible to replace the operations, for example, fine turning, grinding or polishing, with hardening finishing.

An increase in the reliability and durability of engineering products is due to the high quality of processing and is achieved by increasing the structural and fatigue strength of parts after hardening, contact stiffness, wear resistance, endurance of their working surfaces, etc.

Titanium alloys are one of the main structural materials currently used in various industries. Their widespread use is associated with a set of properties inherent in titanium and its alloys - high specific strength, corrosion resistance in many aggressive environ­me­n­t­s, non-magnetism, good heat resistance at operating temperatures up to 500…600 °C.

 During hardening and finishing by surface plastic deformation (SPD), defects created in the surface layer of the part during previous cutting operations, especially during grinding, are largely eliminated, the layer is strengthened, compressive residual macrostre­s­s­es are created in it, and the durability of the parts increases. Traditional SPD methods include rolling with a ball or roller, polishing, diamond burnishing, etc.

The most promising way in this case is processing with an ultrasonic tool or ultrasonic finishing (UFO). When smoothing parts at ultrasonic frequency, due to the pulsed nature of the processing effect, the effectiveness of the impact on the material of the part increases even more.