Research On Deep-hole Drilling

With the development of science and advancement of technology,the efficiency of deep hole drilling in the field of machining has attracted more and more attention.Gun drills and deep-hole twist drills are common deep-hole machining tools.The traditional concept is that the quality of gun-drilled holes is superior to that of deep-hole twist drills,but the gun-drilling processing system is complicated and inefficient.In order to improve the efficiency of deephole machining and improve the quality of deep-hole machining,this paper compares the size of the cutting force,the quality of the machining hole,the gun drilling depth,and the machining quality of three different materials HT200,6061 aluminum alloy and 45 steel by using gun drills and twist drills.The hole microstructure of the hole wall is changed by the hole twist drill.The single-edged cutting structure of the gun drill is obtained,which makes the gun drill unbalanced in the drilling process,the gun drill guide structure forms a pressing effect on the processed hole wall,and the surface roughness of the processed hole is improved,but two The roundness and bore diameter error of the machining hole of this kind of tool are not much different.Therefore,the structure of the twist drill is improved,and chamfers of different widths are ground at the turning point of the twist drill to increase the extrusion of the twist drill in the process of drilling.Through improving the drilling experiment of the twist drill,the chamfer with different width at the outer edge turn-around is obtained,which has less influence on the axial force of the tool during machining,and has a greater influence on the torque;it has less influence on the roundness of the machining hole and has a greater influence on the hole diameter.For the 6061 aluminum alloy soft plastic material hole surface roughness improvement is obvious,followed by HT200,45 steel processing hole surface roughness effects minimal.