Tool Wear Mechanism and Experimental Study on Deep Hole Gun Drilling of 304 Stainless Steel

Deep hole gun drilling is in a closed and semi-closed state， and the machining process is complex. The unstable drilling force， severe tool wear， and poor processing quality have always been difficulties in deep hole gun drilling. 304 stainless steel has good corrosion and heat resistance， and is widely used in various industries. However， high hardness， poor plasticity， and characteristics of sticking knives have always restricted its development in engineering applications. Therefore， this paper uses 304 stainless steel as the research object and performs process parameter optimization and tool wear experiments. Firstly， based on the optimization experiment of process parameters， the influence of cutting speed and feed rate on drilling force and hole wall roughness is analyzed. The process parameters of the subsequent experiment are optimized as follows： spindle speed is 1 270 r / mm， feed rate is 0.02 mm/r， and oil pressure is 3 MPa. Secondly， based on the tool wear experiment， the variation law of tool wear and tool wear form is studied. With the help of scanning electron microscopy （SEM） and energy dispersive spectroscopy （EDS）， the tool wear mechanism of deep hole gun drilling 304 stainless steel is expounded. Finally， the influence of tool wear on the processing quality is revealed， and the suggestion of tool regrinding is put forward.