The invention discloses a car
automatic transmission sun
gear manufacturing process. The car
automatic transmission sun
gear manufacturing process comprises following steps of firstly, discharging; secondly, spheroidizing annealing; thirdly, blank making; fourthly, shot blasting; fifthly, lubricating; sixthly, cold
forging extrusion forming, wherein a blank obtained after lubricating is put into the cold
forging extrusion female die, and through cold
forging extrusion, a first-stage transmission gear is formed; seventhly, upsetting, wherein the blank obtained after cold forging extrusion forming is put into an upsetting female die, and a
solid shaft segment corresponding to a second-stage transmission gear is formed through upsetting; eighthly,
cutting, wherein the blank obtained after upsetting is
cut, and a second-stage transmission gear, an annular groove and a hollow shaft are machined; ninthly, heat treatment. Through cold forging extrusion, the sun gear one-stage transmission gear is formed, the small-size sun g ear
cutting machining difficulty and the
cutting machining amount are reduced, production efficiency is high, the material
utilization rate is high, the
machining cost is low, the
metal assembly line is not
cut, the
grain structure is compact, the first-stage transmission
gear tooth face strength is improved, the mechanical performance is high, the quality is good, and the car part complete requirement is met.