Study On Shear Machining And Tool Wear Of Amorphous Alloy Strip

The amorphous alloy has excellent physical and mechanical properties,and its high strength,hardness,fracture toughness and fatigue strength are used as tool materials and sporting goods materials.Its magnetic property is far better than silicon steel is widely used in transformers,inductors,mutual inductors and other power equipment and electronic devices.In practical application,the amorphous alloy thin strip for making iron core needs to be made into strip with specific width by rolling shearing.Due to the high hardness of the material,high strength,thin thickness and stress sensitivity,the machining surface integrity is poor and the tool wear is fast,which seriously affects the performance of the material.In this paper,the iron-based amorphous alloy strip is taken as the research object.Firstly,the basic material experiment is carried out to analyze its physical and mechanical properties.The displacement load curve of the strip during fracture process is obtained through the tensile test of the strip by the electronic universal testing machine.Analyzed the iron base amorphous alloy strip rolling shear processing,set up a rolling force model,cutting processing cutting tool and strip process to study the shear stress and its distribution characteristics,amorphous alloy roll cutting processing cutting tool force mainly includes two aspects,one is rolling cylinder is in contact with the strip scissors and positive pressure produced by the press,the second is rolling blade scissors cut strip scissors roll profile in the form in the cross section of the strip shear zoned clean force,as the amorphous alloy strip thickness decreases,the ratio of the cutting tool edge radius and the thickness of strip,rolling blade scissors nonlinear stress change present complex stress state.Secondly,studied the amorphous alloy strip rolling shear processing of tool wear and its influence,scissors roll wear performance is mainly mechanical wear of normal wear and play knife blade geometry contact abnormal wear,normal wear process is forming side blade radius brush wear belt and continues to increase,from the initial 10 microns increases to 30 microns,experience from the early wear and stable wear,severe wear three stages;The abnormal wear forms of rolling scissors mainly include cutting edge curling,partial peeling and cutting edge collapse.The morphological characteristics of the shear section of amorphous alloy strip are directly related to the tool wear state.The existence of the cutting edge circle will leave a certain width of the microcrack area on the surface of the shear section attachment of the processed strip,and the surface of the fracture is uneven and there are fine burrs.When the ratio of the cutting edge radius to the thickness of the strip is greater than 1,the width of the residual surface microcrack near the shear section increases sharply,and the machining process tends to be unstable.Finally,based on the iron base amorphous alloy strip rolling shear processing experiment,through the simulation analysis of abaqus strip in the manufacturing process of rolling shear stress and strain state,found that constitute the structural elements of the shearing section collapse Angle,shear fault zone and burr and the correlation of stress state,such as comparative analysis of different tool edge radius of the shear process,the greater the cutting tool edge radius material shear zone the greater the maximum shear stress,shear section morphology quality worse;Pair rolling scissors form a stress concentration area near the shear section.The influence region of stress and strain on cutting tool increases with the increase of cutting edge radius.,so the residual microcrack area near the shear section becomes wider and the collapse Angle becomes larger.The larger the cutting edge radius,the larger the stress range,the greater the zero(0 microns)cutter blade edge radius under concentrated stress,10 microns cutting tool edge radius edge stress concentration decreases,and 30 microns edge radius of the cutting tool edge stress range greatly increased.