关键词: 有限元仿真, 螺栓退刀槽, 滚压轮, 疲劳寿命, 残余应力

Abstract: The bolt retreat groove surfaces were susceptible to stress concentration and prone to fatigue failure. To bolster the fatigue resistance of bolts retreat groove surfaces, a specialized rolling tool for the retreat grooves was engineered. The structure of the rolling wheels was optimized based on finite element simulation outcomes of the interaction between the rolling wheel and the bolts retreat grooves. The optimized parameters were utilized to create the rolling tools, and a rolling experiments were carried out. The effectiveness of the rolling wheel parameter optimization was validated by assessing the rolled surface quality, fracture morphology, and fatigue life. The findings indicate that the most favorable residual stress results on the retreat groove surfaces are obtained with a YG8 material rolling wheel with diameter of 60 mm and face angle of 45°. A rolling wheel fillet radius of 0.9 mm produces the deepest residual compressive stress layers, a radius of 1.1 mm yields the highest subsurface residual compressive stress value, and a radius of 1.2 mm generates the maximum surface compressive stress. Trials were conducted with rolling tools featuring three distinct fillet radii, and the extended fatigue life of the bolts is ascertained with a 0.9 mm fillet radius rolling wheels, thereby confirming the optimal configuration of the rolling tools.

Key words: finite element simulation, bolt retreat groove, rolling wheel, fatigue life, residual stress