| Small stainless steel parts with precision are widely used in aviation,medical and communications industries.However,in the actual production,the processing of small stainless steel parts with precision is more difficult.On the one hand,it is because of hard cutting of stainless steel material,its great toughness,chip separation,etc.;On the other hand,because the parts themselves have the characteristics of precision,small,so the cutting tool has higher requirements.The research on small stainless steel parts with precision cutting insert is not only helpful to solve the characteristics of stainless steel materials difficult to cut,but also to improve the quality of the corresponding products,making them more competitive in the market.In this paper,five carbide coated inserts,including groove(A1,A2),cut off(B1,B2),type C(C1,C2),and type V(D1,D2;E1,E2)used in the processing of small stainless steel parts with precision are studied.Starting from analyzing the structure of five inserts,the coating and matrix of the corresponding inserts were tested.On this basis,comparative cutting experiments were carried out to study the influence of geometric structure,coating and substrate,and cutting parameters on the insert performance.Specific contents include:(1)The structure of chip slot of five inserts was analyzed systematically,and the characteristics of space deviation of cutting edge of cutting insert were analyzed emphatically.The coating of the slotting and c-type insert and the matrix of the v-type insert(D1 and D2)were tested to lay a foundation for the following experiments.(2)On this basis,E1 and E2 inserts with different structures were selected for cutting force and chip breaking experiments,and the influence of groove geometry parameters on cutting force and chip breaking performance was analyzed.(3)Wear experiments were carried out on C type inserts with different coatings.The difference of wear resistance was analyzed from two aspects of coating type and thickness,and the failure mode and wear mechanism were studied.Wear experiments were carried out on v-shaped inserts(D1 and D2)with different matrix components to explore the influence of matrix elements and the density of WC on blade breakage.From the perspective of the actual processing,the life of groove inserts(A1 and A2)with different coating is studied.(4)The influence of the cutting parameters on the cutting effects under the actual working condition are studied in the light of the emphases in the machining process of each cutting tool(groove cutting,c-type cutting and cutting-off).For the groove insert(Al,A2),the optimization parameters of groove cutting were obtained from the comprehensive consideration of cutting force,chip breaking and temperature,A1:Vc=70 m/min,f=0.06 mm/r A2:Vc=90m/min,f=0.06mm/r.In this paper,the influence of three cutting elements on cutting force is analyzed by orthogonal experiment of cutting force for c-type insert,and the empirical formula of cutting force is established.For cutting-off insert,the influence of cutting speed and feed on surface roughness is analyzed emphatically.Through the above experimental research,it can be used as a reference for the manufacture of small stainless steel parts with precision,and the relevant theory of machining tool is improved. |
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