Research On The Influence Of Friction To Tube Power Spinning Process

Spinning is an advanced with little or no cutting process, and has the advantages of few processing procedures, good surface quality, high precision, low cost, simple equipment, so it is widely used in aviation, aerospace, national defense, civil and other fields. Due to the wide application of spinning technology, attracted a large number of scholars have made a systematic study on it. However the current study was limited to the process parameters, spinning mode, the variety of parts etc. which on friction spinning process effects are few. And friction on metal plastic flow and the ability to have some influence, thusaffecting the forming quality of the workpiece, so study the effect offriction on the spinning process is imminent.Based on cylindrical parts as object, this paper studied the forming mechanism of spinning, and taking ABAQUS/CAE as the platform, established in line with the actual conditions and reliable cylinder three roller power backward spinning finite element model. By means of this model, it researched on the influence of feed ratio and the thinning rate tube power spinning process in frictionless state.According to the numerical simulation results and the regularity of the feed ratio and the thinning rate, to select the appropriate combination of parameters and modified models, using friction as a single variable it researched on the influence of friction to tube three roller power backward spinning process in different friction state. And it show that under the action of friction, variation of equivalent stress of workpieces are not identical, but which is less than no friction state on final spin; the equivalent plastic strain decreases with the increase of friction coefficient, and the effect of friction from the outer surface is greater than it from the inner surface, both of them have the cumulative effect; similar with the variation of equivalent plastic strain, friction on the inner surface of the workpiece rarely little effect on the temperature field, but the influence from the friction on the outer surface is greater, and with the increase of friction coefficient the temperature of deformation is increasing, and the maximum temperature occurs in the deformation zone; under the influence of the friction from outer surface, the wall thickness and enlarged diameter of the workpiece increases with the increase of the friction coefficient; under the influence of the friction from inner surface, the thickness of workpiece increases with the friction coefficient increasing, but the enlarged diameter of the workpiece decreases with the increase of the friction coefficient; under the action of both, wall thickness of the workpiece reached the maximum, but almost unchanged with the increase of friction coefficient, but for the enlarged diameter is increased with the friction coefficient decreases. So that to select appropriate friction solution which can effectively improve the quality of cylindrical workpiece in the power spinning process.