Fan Xinghai, chief technician of Anhui Masteel Equipment Maintenance Co., Ltd. Fan Xinghai has 93 national first person patents, 40 technical secrets and 37 advanced operation methods authorized for intellectual property rights. He presided over the "Development of Domestic Noise Reduction Metro Wheels", invented all kinds of production tooling for silencing rings from correction, line drawing, cutting, groove grinding, fixed installation, welding, surface grinding, inspection, etc., and overcame the thermal expansion and cold contraction deformation of butt welding of key silencing rings inside the wheel body and the penetration technology bottleneck that the welding layer does not contact the wheel surface, It fills the gap in the manufacturing of silencing wheels in China@ Anhui Federation of Trade Unions