Effects of stretching conditions on forming quality of mirror skins

On the basis of full consideration of appearance of the slip band and the shape fix-ability of the forming parts, the reasonable conditions in the stretching forming of airplane mirror skin were determined by means of analysis of the effects of stretching velocity, geometrical dimensions of blank, geometrical parameters of dies and lubrication methods on forming quality. The experimental results have shown that improving the deformation uniformity of sheet materials, delaying the appearance of slip band, and increasing the material deformation degree of the forming region are the main measures to work out the optimum process parameters and improve the forming quality of the skins.