Development of the Process of Stamping by Rolling of Tubular Preparations Using Induction Heating

Abstract

Methods of pressure treatment of metals based on the action of technological load in the conditions of a localized plastic cell. The main purpose of such methods is that the change in shape at any time is performed only on a fraction of the volume of the workpiece and when moving the deformation center covers the entire volume. These are well-studied and widely used in the production of free forging, rotary forging, rolling, etc. A relatively new method of MP - stamping by rolling, is characterized by a number of positive effects: - reduction of deformation force in comparison with traditional methods in 5-30 times; - the possibility of processing metal in the cold state with the same technological effort as in hot processing; - the equipment corresponds to a high level of labor safety; - reducing the size, weight and cost of equipment; - the possibility of implementing various technological operations. Modern mechanical engineering, instrument making and other metalworking industries widely use and manufacture parts with a large ratio of cross-sectional dimensions, the production of which by existing methods of metal forming is either inefficient or impossible. The most technological are the processes of SHO, in which the workpiece has a tubular or annular shape. Such blanks are well amenable to induction heating, which while providing a high frequency electromagnetic field allows them to be heated quickly and efficiently. This can heat a limited amount of workpiece material. Thus, the use of induction heating in the processes of SHO significantly expands their technological capabilities, which determines the relevance of the chosen topic. The main advantages of induction heating include: transmission of electrical energy does not require contact devices, is carried out directly into the workpiece, which increases the heating rate; due to the possibility of controlling the frequency of the current, the maximum power is released in the limited thickness of the surface layer of the product, which is especially effective when heating the pipe blanks; induction heating can increase productivity and improve working conditions.