In the field of home appliance manufacturing, screw assembly quality directly impacts product reliability and after-sales costs. Traditional manual tightening processes, with large torque fluctuations (±15%), lead to issues such as screw loosening and cracking of plastic parts, accounting for 38% of after-sales complaints in the industry (China Household Electric Appliances Association's data). As home appliance products upgrade towards lighter weight and greater intelligence, the requirements for assembly precision are increasing. Smart screw tightening tools significantly improve yield rates through closed-loop torque control, data traceability, and multi-stage tightening strategies. Application cases at leading companies show that intelligent tightening can increase assembly efficiency by 30 % and reduce rework rates to below 1%.