Abstract
In order to solve the problem of chip removal of the large-length-diameter ratios deep-hole machining, the negative pressure jet model is established on the basis of analysing the mechanism of DF system’s negative pressure chip removal. To solve the energy loss caused by the eddy current phenomenon in the front separation zone, this paper adopts two-stage injection method. The pre-nozzle is added in the front separation zone so that part of the jet fluid enters the front separation zone through this nozzle, reducing unnecessary energy in the front separation zone and increasing the negative pressure value. Through theoretical analysis and fluent simulation optimization experiments, the paper proved that jet angle of the new jet nozzle is 33 degree and the clearance is 0.4mm has the best effect. The negative pressure zone is the largest, and the pressure value in the negative pressure zone is reduced by about 50.7%, which minimizes the energy loss in the front separation zone and enhances the negative pressure chip removal capability
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