The Design Of Curvature And Straighten Precision On Superfine Tube Straightener

The double curvature roller curve can not form efficient reverse curvature area in thestraightening process, therefore it’s difficult to improve straightening quality. Smalldiameter and high intensity pipe requires more compressive deformation, in this case thepipe is hard to been bited and contact line shorten severely. The reverse curvature area isdifficult to form, the straightening effect is poor and even emergence of seriousindentation. Therefore, in order to improve the effect of millimeter stainless steel tubestraightening quality, the contact area must be increased and favorable conditions shouldbe created to form effective curvature inflection zone, etc.In comparison with double curvature roller curve, inversed bending curvature rollercurve makes it easier to form reverse curvature area in the straightening process, that isaccord with the actual situation. The application of the inversed bending curvature rollercurve to the second and fourth pairs of rollers is aim to length efficient reverse curvaturearea and improve straightening quality of superfine tube. Domestic and foreign scholarshave conducted their research on the value of reverse bending curvature, but there is noconsensus theory analysis and the calculation results vary widely. The author solvereasonable inversed curvature value with analytic theory result of residual curvature andthen Matlab is applied to draw roller curve.Inversed bending curvature roller curve and double curvature roller curvestraightening models are created to simulate straightening process through Abaqus, andafterward, comparing the straightening quality of different straightening models.Simulation experiment result shows that the compressive deformation of inversed bendingcurvature roller curve is more reasonable, straightness and residual stresses are better thandouble curvature roller curve. This study proves that inversed bending curvature rollercurve is important and necessary in straightening of superfine tube.At the same time, according to the cross roller straightener’s working characteristicsof rotating forward and reverse bending straightening principle, and applicable calculatingformulas of bending reverse bending roller type is deduced. Different diameter, wall thickness, material of pipes are straightened, then deformation of different diameter, wallthickness, material of pipes are analysised after straightened by comparing the theoreticalcalculation and simulation analysis deformation. The straightness, residual stresses andovality are evidence of the ability of inversed bending curvature roller.Eventually, the visual and controllable CASAMS is completed, that is computer aidsetting and manage system.The straightening process parameters can be controlled andvisualization and dynamic straightening process parameters is intuitively and simplyreflected in this system. At the same time, the historical data can be recorded, thus theinfluence factor of straightening process can be monitored through the historical output.