Experimental And Simulation Study On Shear Processing Of Copper Alloy Sheet

With the rapid development of artificial intelligence IE,integrated circuit IC,and communication 5G technology,the precision requirements for electrical and electronic connectors and IC lead frames that use copper alloys as the main materials are becoming higher and higher.In this paper,through the shear experiment and simulation analysis of H62 brass,H80 brass and T2 pure copper,the influence of the physical and mechanical properties of copper alloy on the shear process is deeply studied,and the copper alloy shear is optimized through the shear experiment of copper alloy Cutting process.The hardness,strength,elongation and other physical mechanical properties of the three plates H62,H80,and T2 were analyzed through the microhardness and tensile experiments of the basic material experiment.For good materials,the higher the height of the shear band,the collapse angle,and the burr,the higher the brittleness of the material.Work hardening will be different because of the different hardness of the material itself.The lower the hardness of the material itself,the more obvious the work hardening during the shearing process and the deeper the depth of the processed hardness layer.The lower the strength of the material,the lower the shearing force,and the H62,H80,T2 Z-direction and Y-direction forces decrease in sequence.Through the experiment of copper alloy sheet shearing process parameters(shear speed,shear clearance),it is found that the optimal shear speed of H62,H80 and T2 is 560mm/s,560mm/s and 28mm/s respectively,The fracture zone has the smallest height and the best shear quality.The shear clearance has a greater influence on the plate.With the increase of the shear clearance,the height of the shear band of H62 and H80 first increases and then decreases,and the shear band of T2 has been reduced;The shear clearance increases and increases;H62,H80,T2 have the highest shear band height,the lowest fracture zone height,and the best shear quality when the relative clearances are 6%,4%,and 2%,respectively.A finite element model of copper alloy sheet shearing was established.The stress concentration phenomenon of H62,H80 and T2 near the cutting edge of the tool was analyzed by DEFORM-2D finite element simulation.It was found that the maximum stress value decreased in turn and the maximum equivalent stress in turn Decrease,along the shear edge direction,T2 equivalent strain is the largest,the deformation affected area is also larger,and H62 is the smallest strain,the deformation affected area is also the smallest;as the shear clearance increases,the larger the tensile stress value,The micro-cracks in the plate are easier to form and propagate,so that the proportion of the shear band on the shear fracture surface decreases and the fracture zone increases;the closer to the shear edge,the higher the equivalent strain value,as the The shear clearance gradually increases.By comparing the cross-sectional characteristics of simulation and experiment,the two have good consistency.Improve a tensile experiment device that can realize different stress states of copper alloy sheets.Through pure tensile,tensile-shear composite,pure shear fracture and other material stress experiment of copper alloy,the stress molar circle during shearing process is analyzed.From the stress distribution,the mechanism of the influence of the shearing clearance on the stress state of the shearing process is discussed.