Machining technology of left steering knuckle of automobile

The invention discloses the machining technology of a left steering knuckle of an automobile. The machining technology of the left steering knuckle of the automobile comprises the steps that a shaft end face is milled; a central hole is drilled; the other central hole is drilled; an outer circle of each section is turned in a numerical control mode; the two end faces of a taper hole are milled and deburring is conducted; the two outer side faces are milled and deburring is conducted; the two inner side faces are milled and deburring is conducted; a phi34 bottom hole is drilled; the other phi34 bottom hole is drilled; a 2-M10 oiling bottom hole is drilled; a 2-M10 end face is reamed; 2-M10 threads are tapped; the phi34 holes are roughly bored so that phi33.5 holes can be formed and a phi38 spigot hole is bored so that a phi37.5 spigot hole can be formed; a phi36 taper hole bottom hole is drilled; a 2-phi14.3 through hole is drilled; 180-degee turnover is conducted and the other 2-phi14.3 through hole is drilled; a M12 blind bottom hole is drilled; a M12 through bottom hole is drilled; the end face of a 4-phi14.3 through hole is reamed; the end face of the M12 through hole is reamed; threads of the M12 blind hole are tapped; threads of the M12 through hole are tapped; a 45-degree slope is milled; M27*1.5 threads are turned; a key groove with the width of 7 and the length of 14 is milled; a 2-phi5.5 crossed hole is drilled and the crossed angle is 67.5 degrees; die cutting is conducted on the M27*1.5 threads; deburring is conducted; a phi36 taper hole is bored and the taper ratio is 10:1; fine boring is conducted on the phi34 holes and the phi38 spigot hole; a phi50 outer circle is ground; a phi35 outer circle is ground; a phi14 transition circular arc is rolled; final inspection is conducted and the left steering knuckle of the automobile is put in a warehouse.