Deformation of Hollow Forgings of The Sleeve Type in the Process Of Drawing Without a Mandrel by Beveled Punches
Year: 2025
Type: article
Abstract: The purpose of the work is to increase the efficiency of the processes of deformation of hollow cylindrical blanks without a mandrel by means of scientifically substantiated design of their deformation modes based on the created numerical models, which allow developing and evaluating a new technological process for the deformation of such forgings. The new technological process of deformation will increase the competitiveness of domestic products, which will allow increasing the volume of exports of unique products on the foreign market. The article develops a new technological process for the deformation of forgings of the type of long sleeves with rhombic strikers with slopes. The study of the deformation process made it possible to clarify the regularities of the shape change of the hollow blank for the new technological process. The angles of the cutouts and slopes of the strikers (10°, 20° and 30°) and the length of the workpiece feed into the strikers were studied. At feeds equal to 0.1D and a cut angle of rhombic punches of 115°, the minimum closing of the hole of the hollow workpiece takes place. The effective geometry of the deforming tool to increase the extraction coefficient when deforming hollow sleeves should be rhombic punches with a bevel slope of 10...20° and a feed length of the workpiece b/D=0.1. The curvature of the end face of the hole is equal to the allowance for machining, which ensures obtaining the required dimensions and shape of the forging without using a mandrel. Based on the results of a theoretical study of the mechanism of forging the cylinder hole, an effective scheme was selected to ensure minimum forging of the hole, in which the cutout punches had a cut with an angle of 115° and a width of the deforming part of 0.1D. The general pattern for the studied deformation schemes is that the intensity of hole deformation is the same for different crimps with constant ratios of the workpiece sizes. At feeds greater than 0.2D, there is no qualitative or quantitative change in the degree and intensity of hole forging. This allows us to determine the recommended feed for intensive drawing of the workpiece and reducing the degree of hole forging. The recommended feed should be in the range (0.1...0.2)D.
Authors: Oleh Markov, Yevhen Muzykin, Pavlo Muzykin
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W4409462196