Machining device and machining method for driven wheel tooth top chamfer

The invention discloses a machining device and method for a chamfer at the top of a driven gear in the technical field of gear machining, and the machining device comprises a machining tool which comprises a machining shaft, a chamfering tool detachably connected with one end of the machining shaft and a driving gear arranged on the machining shaft in a sleeving manner; the negative pressure part comprises a negative pressure cylinder arranged outside the machining shaft in a sleeving mode and a negative pressure fan installed in the negative pressure cylinder, and a power shaft of the negative pressure fan is meshed with the driving gear through a driven gear; the demisting piece comprises an air collecting barrel connected into the negative pressure barrel, a plurality of layers of demisting plates installed in the air collecting barrel and a liquid collecting box installed at the bottom of the air collecting barrel, the machining shaft is used for driving the chamfering tool to machine and rotate to serve