Experimental study of the error in the height of the contour of box-shaped parts, obtained by drawing from welded blanks of different thickness

Abstract

The development of sheet-stamping production within the framework of meeting the needs of modern mechanical engineering involves the use of advanced technologies, materials and blanks, which makes certain requirements for the level of blank production technologies in general. In modern conditions, sheet-stamping production involves the manufacture of stamped parts in limited quantities due to their constantly changing design, which, in turn, requires optimization of the volume of investments and reduction of the time required for the implementation of technological preparation of production, flexibility of technological and design solutions, as well as the maximum approximation of all parameters of stamped parts to parameters of the finished product in order to reduce subsequent processing. Box-shaped sheet metal stamped parts obtained during the implementation of the drawing operation are actively used in the medical, light, watchmaking, food machine-building, electrical, instrument-making, and automotive industries. One of the main tasks for obtaining high-quality box-shaped sheet-stamped parts is the creation of a stamping technology that meets modern production requirements based on progressive methods for calculating shaping operations, as well as designing the contour of the original blank taking into account the peculiarities of the shaping process and the required geometric parameters of parts. Depending on the purpose of the box-shaped sheet-stamped part, the main geometric parameters are determined, the correspondence of the actual values of which to the required ones allows to make a conclusion regarding the quality of the obtained stamped product. As a rule, such a parameter is the height of the box-shaped part, the error of which ultimately should not exceed the tolerance assigned by the designer. For example, in the automotive industry, one of the promising directions for reducing the weight of a car while maintaining the strength parameters of its units and elements, as well as reducing their cost, is the introduction of sheet welded blanks of different thickness. This article is devoted to an experimental study of the error in the height of the contour of tall boxes with relatively large radii of corner curvatures, obtained by drawing from these blanks made of high-strength steel. This work was carried out within the framework of the grant NSh-2601.2020.8.