Study On Friction And Wear Characteristics Of New Self-locking Interchangeable Drilling

Drilling is currently the most widely used hole machining method,the twist drill with the highest frequency in drilling process has the disadvantages of low processing efficiency,poor cooling effect,fast tool wear,long dressing cycle,and other disadvantages,can't adapt well to the market.New self-locking interchangeable drill bit separates the cutting part from the cutter bar,cutter head made of carbide,the body is made of common alloy steel.New self-locking bit structure makes it easier to change the cutter head,and Increase productivity.One size of drill pipe can be applied to a variety of cutter heads within a certain size range,save tool manufacturing costs.At the same time,it is different from the traditional twist drill and that has an inner cooling water hole,the tool has better heat dissipation during drilling and speeds up the removal of chips from the hole.Takes higher processing speed than twist drills,greatly improve processing efficiency.At higher processing speeds,the wear and life of new drills are one of the important criteria for measuring tool performance,it's worth investing a lot of research.To explore the friction characteristics of a new type of self-locking interchangeable drill,this paper first analyzes the friction behavior and tool wear in tool cutting,according to friction and wear theory,the performance of high-performance tool materials should be provided.Analyze tool forces during drilling,design orthogonal test and single factor test for different grades of cutter head material,measurement of drilling forces in drilling operations with devices such as force measuring systems,calculate the average friction coefficient of the tool according to the force,provide experimental data support for finite element simulation analysis of tool wear.Then analyzed the effect of drilling parameters on the friction coefficient: As the spindle speed increases,its friction coefficient decreases;friction coefficient decreases with increasing feed rate;tool size is proportional to friction coefficient.Based on the friction test scheme and results,a finite simulation software Deform 3D was used to simulate the wear of the new drill bit,study drill bit wear characteristics.Analysis of Orthogonal Experimental Simulation Results by Range Method,find out the influence level of drilling parameters on tool wear,among them,the spindle speed has the greatest influence on the wear value;seek the optimal machining solution for the 45 th steel for new self-locking interchangeable drills.At the same time compare the wear of two grades of cemented carbide drills,determine the low cobalt content of carbide grades better wear resistance.To verify the feasibility and accuracy of a new type of drill simulation using Deform3 D finite element analysis software,drilling experiments under the same cutting conditionson the machining center.Observe tool wear with universal tool microscope,combining optical measuring instruments to collect experimental data;comparison of simulation and experimental results,analyze the changes in both and the increase in the change curve,comparing simulation with experimental results,from this,the feasibility and reliability of the research on the friction and wear characteristics of the new tool are analyzed by the finite element simulation analysis.Using Finite Element Analysis to Reduce New Product research and development costs,reduced test costs in research and development.The development of other new types of tools has practical significance.