Fuel nozzle is a major component of engine combustion chamber

the main function of which is to supply fuel with suitable quantity and good atomization quality according with different working conditions. The Processing quality of micro-hole nozzle is the key parameter which could ensure the requirement of engine thrust and affect the efficiency of combustion chamber and the performance of engine. This paper introduces the structure features of the main injector

and applies the micro-hole drilling in the main injector. By analyzing the characteristics of the micro-hole drilling system

it summarizes cutting parameters that meets the requirements of the main nozzle

advances an inner cavity burr control method. The machining technology described in this paper has been applied in practical production.