EVALUATION OF THE INFLUENCE OF THE SURFACE STAMPING OF A SHEET BILLET ON THE EXTRACTING PROCESS OF A CYLINDRICAL PART
This article discusses the technological possibility of reducing tensile stresses in a dangerous section during deep drawing of a cylindrical part, leading to thinning and subsequent rupture of its wall. As is known, for this purpose, it is advisable to reduce the magnitude of the friction forces in the zone of pressing the workpiece flange to the matrix mirror. A decrease in the magnitude of the friction forces was achieved due to the preliminary embossing of the surface of the sheet blank facing the matrix mirror, in the form of a large number of microdepressions, which, despite the large value of the flange clamping force, effectively retain the lubricant, which significantly reduces the coefficient of friction.