CONTROL AUTOMATION OF DIE CASTING PROCESS WITH CRYSTALLIZATION

As an object of control there is a process of pressure application upon melt under consideration. In the course of metal pressure shaping the atoms ap-proach takes place at the elimination of some heat so that changes of a value and a speed of pressure applica-tion ensure atom approaches for different distances of elastic repulsive force actions till crystallization begin-ning. A possibility of accumulation and changes of in-teratomic interaction elastic energy in molten metal is considered as a fundamental basis for the change of metal structure and properties connected with it. The-reupon at the study of the process it is necessary to determine significant factors and their impact upon casting properties and on the basis of the mathematical description to determine laws of control. In the paper it is shown that pressure application is possible to a melt according to a certain law, before crystallization beginning, at the expense of modern control equipment and automation means use. This process represents a high significance in the creation of modern systems for manufacturing process control with the purpose of obtaining new kinds of materials with a specified combination of physical-chemical properties.

Nanocrystalline Soft Magnetic Toroidal Cores of the Highest Relative Magnetic Permeability and Low Coercive Force

All the technologies of the melt quenching preparation ensure its time-temperature treatment to not only improve but also stabilize the metal structure and properties with every melt. The influence of annealing temperature of nanocrystalline alloy Fe72.5Cu1Nb2Mo1.5Si14B9 on the structure and magnetic properties has been investigated. The relation between numerical values of the coercive force, the initial magnetic permeability and the magnetic hysteresis loop rectangularity factor allows optimizing a mode of nanocrystalline alloy heat treatment.