To solve the problem of chip removing of deep-hole processing

both the existing DF deep-hole drilling system structure and the influence factors of the negative-pressure removing crumbs were analyzed by the hydraulic theory.The negative pressure

rate and energy field of the injection angle k and negative pressure gap S in the DF negative pressure device were simulated by using the software Fluent.Through the comparison between the theoretical analysis and the simulation test

it was concluded that when k was 30°and S was 0.4 mm

negative pressure effect were best;when k was 29°and S was 0.5 mm

negative pressure effect were better.The above coclusion provided theoretical basis for the new type negative pressure jet structure

the negative pressure mechanism and characteristics of scraps of near-dry deep-hole processing.