Stainless steels tub end process
In the process of stainless steelstub end pipe, the blank outer edge is usually not deformed due to the constraint of the blank holder force or due to the width of the outer edge and the diameter of the flanged hole is relatively large, the vertical wall has been deformed is the force transmission zone, with the bottom of the hole is the deformation zone.The deformation zone is in the state of bidirectional tensile stress (the stress in the thickness direction is ignored), and the deformation zone will be thinned under the action of tensile stress, which is the same as the bulging.Small punch blanking, especiallystub end, can be almost difficult to solve.If the prefabricated hole is not punched, thestub end height can be guaranteed and the positioning is not a problem, and the operation is very convenient;But stainless steel flange pipe vertical edge may be highly inconsistent, and the crack phenomenon of some material can exist, according to the analysis on the mechanical properties of the 08 f steel material, its ultimate strength, compared with that flow limit the possibility of cracks is not too big, on the basis of the existing experience, and in addition to the vertical edge height is not consistent, there may be traces of crack, but does not affect use. Therefore decided not to rush prefabricated holes.Circular hole stainless steelstub end pipe belongs to the elongation classstub end, stainless steelstub end pipe when the tangential direction of the blank deformation area is subjected to tensile stress, produce tangential tensile strain, in the hole edge and the maximum, for the unidirectional stress state, according to the yield criterion can determine the hole edge is the first to occur
The thickness of plastic deformation is the most severe, so it is the most likely to crack.The deformation area of stainless steel flanged pipe is subjected to radial tensile stress and the radial strain value is relatively small.For thestub end of non-circular holes, the stress and strain distribution along thestub end line is not uniform.When thestub end height is the same, the tangential tensile stress and tangential elongation of the parts with smaller radius of curvature are larger.The tangential tensile stress and the tangential elongation deformation were smaller in the parts with larger radius of curvature.The linear part is similar to the bending deformation. Due to the continuity of materials, the deformation of the curve part will be extended to the linear part, so that the tangential elongation deformation of the curve part can be alleviated to a certain extent.
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