The invention discloses a double-tooth sun gear
machining method and an inner hole allowance determining method, and relates to the technical field of gear
machining. The
machining method of the double-tooth sun gear sequentially comprises the steps of blank
forging, semi-finish turning, outer circle tooth A
hobbing, inner hole and two end face
coating of an anti-seepage agent,
carburizing,
quenching, shot blasting, finish turning, inner hole tooth B rough
gear shaping machining, inner hole tooth B fine
gear shaping machining, outer circle tooth A
grinding machining, burn inspection,
magnetic powder inspection,
tooth part precision detection and bench work. The inner hole allowance is determined by adopting test bars with the same material and the same process, and accurate reservation is realized through quantitative calculation by detecting the radial
hardness distribution rule of the test bars. The core technology is a
combination method of differential seepage prevention, test bar allowance quantification and staged machining, the
machinability of inner hole and end face seepage prevention is ensured before carburization, the performance is ensured through normal hardening of outer teeth, hardened layer residues and material waste are avoided through precise allowance, and the bearing performance of the inner teeth is ensured.