The Preliminary Research On Metal Plate Flanging Properties Of Fiber Orientation Distribution Along The Thickness Direction

The presence of fibrous tissue, so that the mechanical properties of metallicmaterials has obvious anisotropy, performance and processing technology on themechanical parts of the impact can not be ignored. The correct understanding and useof fiber material, is one of the important issues need to be studied in materialsprocessing engineering. Sheet metal flanging deformation, limit flanging coefficientand fiber directional correlation.The main work of this thesis are: design and manufacture of the die diameter40.4mm pressure plate flanging test die; Q235steel sheet and the5052sheetaluminum two materials, preparation of fiber orientation in the plane and along thethickness direction of two kinds of distribution, precast hole diameter range is10.5~27.9mm34sheet blank (size fiber direction in the plane distribution is60mm*60mm,the fiber direction in thick to the size distribution of phi100mm, a total of about200);refer to national standard GB/T12459-2005, a direct method test, the flanging test onthe hydraulic machine, the6groups of experimental data. Results:(1) for Q235steelsheet, with the diameter of D convex=34.9mm, cylindrical punch test D convex=31.8mm tested separately, fibrous tissue along the thickness direction of the platematerial distribution than the limit hole flanging coefficient distribution in the planeincreases about58%~60%, limit flanging height decreases about32%~35%(;2)with the diameter of D convex=34.9mm, cylindrical punch D convex=31.8mm weretested on5052aluminum specimens, fibrous tissue distribution of flanging propertiesof5052aluminum sheet has no obvious influence.The relative thickness of t/d material is allowed, flanging coefficient is smaller,the greater the forming limit. Metal material will produce thinning phenomenon in theflanging process, thinner materials in the flanging process, not material added, thusthe most prone to fracture.Turn hole punch fillet radius are generally larger, or even a spherical or parabolic,for deformation. Spherical, conical, cylindrical parabolic punch than a punch on theflanging is advantageous, because the former in the flange, Kong Bian is a smooth transition to gradually open, deformation of material, so the flanging coefficient canbe smaller.This paper was the first time the fiber orientation distribution along the thicknessdirection limit flanging coefficient and limit flanging height data, data distributionand fiber structure of Q235steel sheet in the plane are studied and compared, verifiedthe relationship and the direction of rupture of the fibrous tissue. Research shows that,the fiber direction along the thickness direction distribution and fiber orientation inthe in-plane distribution of flanging performance difference. Fibrous tissue flangingto distribution along the thickness of poor performance in the distribution in the plane;fiber tissue flanging to distribution along the thickness is more difficult. Thestudy data, prove that the fiber along the thickness direction flanging performanceflanging properties and fiber distribution in the plane of the difference, the traditionalflange fibrous tissue only considers the distribution of in-plane direction flangingproperties, the test used the fibrous tissue along the thickness direction of the sheetdistribution properties of metal plate flanging, material flanging performance indifferent direction of fiber tissue enriched.