Abstract
For a lead granules casting installation in order to reduce metal overheating at the outlet of an electromagnetic doser, it is proposed to make its channel part in the form of two consecutive sections: directly the channel with liquid metal located in the gap of the electromagnet, and a copper bus. The latter connects the flanged end of the channel with the doser bath, thereby forming a closed electric circuit for inductive induction of electric current. Based on previously performed experimental studies, the operating characteristics of the electromagnetic doser were determined in the form of generalized dependences of the electric current in the liquid metal of the doser channel, its optimal frequency and the melt flow rate through the doser on the diameter of the granules. By means of multiphysical modeling, the thermal state of the electromagnetic doser with the proposed channel part was investigated and its thermal characteristics were de-termined. It is shown that for this design of the doser, the overheating of the melt at the outlet of the nozzle that forms the metal jet, relative to the temperature of the metal at the inlet to the channel, does not exceed the maximum permissi-ble value for stable shaping and effective cooling of the granules. Ref. 7, fig. 6.