Design of product properties by suitable planning of a cold forging process

摘要

One of the main advantages of the cold forming technology is improvement of mechanical properties such as tensile strength and hardness. At cold metal forging the hardness increases by plastic deformation, also known as work hardening. The degree of plastic deformation is represented by equivalent plastic strain. It is generally accepted that the mechanical property such as hardness are directly related to equivalent plastic strain. If the operating sequence to manufacture a certain product by cold forging is suitably planned, the required value of equivalent strain or appropriate hardness in the product's cross-section is achieved. The paper deals with planning of mechanical properties in manufacture of antivibration elements for the needs of the automotive industry and hubs of magnetic ignition systems for the motorcycle industry. At the production of antivibration elements the resistance to permanent plastic deformation in the case of axial dynamic loading of a product have to be assured, while in the case of hubs of magnetic ignition systems the appropriate hardness in the product's cross-section has to be achieved. A reliable design of the desired mechanical properties of products is assured by suitable planning of the forming processes in the virtual environment with the support of numerical simulations.