Abstract:Segmented feeding method is used in drilling process of deep drilling control system,but after each drilling rewind,backlash before the drilling depth will be increased into the next period,and it is increased with increase of segments,causing actual processing time and energy consumption doubled.The stroke switch can be used to solve the problem,but it will greatly increase the complexity of the drilling system,and to materials with different hardness and different drilling depth,the process is inefficient.PLC related directives were used to write timing function programming,a new control system was designed.By automatically recording the difference of rewind time and working into the safety margin required travel time,timer was set to control the fast forward trip with the time difference,then the above problems were solved well.The experimental results show that:the new system fully meets the control requirements,and the drilling efficiency is effectively improved.