RU94003906A - Method and apparatus for metal vacuumizing in the process of pouring - Google Patents

Abstract

FIELD: metallurgy. SUBSTANCE: method involves creating vacuum in vacuumizer; feeding metal flow from pouring ladle into intermediate ladle; vacuumizing metal flow through vacuumizer; cutting off metal flow from pouring ladle; replacing pouring ladle with new one; resuming pouring cycle; prior to feeding metal flow to vacuumizer, directing metal flow through sluice chamber connected with vacuum pipeline. Upon flowing of 85-95% of metal from pouring ladle, pouring rate is reduced to value indicated in Specification. Upon emptying one pouring ladle, prior to replacing this ladle with new one, pressure in sluice chamber is regulated by delivering atmospheric air into sluice chamber to obtain atmospheric pressure. When new pouring ladle is set, vacuum is repeatedly created. Apparatus has vacuumizer 2 with cover and vacuum pipeline 7, pouring ladle 1 with closure 5 and skirt 11, which is hermetically joined to vacuumizer 2, intermediate ladle 4, sluice chamber 6 with vacuum closure 8 which is provided with mechanism for moving it in vertical and horizontal planes. Sluice chamber 6 is positioned on vacuumizer cover and is communicated with vacuum pipeline 7 and atmosphere through bypass line. Vacuum closure 8 is made in the form of movable plate 18 with detachable fire-resistant spout 19. Horizontal motion mechanism 21 is formed as stem 23 sealingly inserted through sluice chamber wall. Stem 23 is connected with plate 18 through shank with pins mounted in vertical slots of fork 27. Mechanism for moving plate 18 in vertical plane has symmetrical guides inserted into side slots of plate 18. EFFECT: increased efficiency, reduced heat loss, increased strength of lining, reduced consumption of inert gas and simplified maintenance. 3 cl

Claims (1)

The invention relates to the field of metallurgy, in particular to methods and devices used in the evacuation of liquid metal directly in the casting process. The objective of the invention is to provide a method for evacuating a metal during casting and a device for its implementation with the possibility of continuous evacuation of mass-cast melts, with an increased yield of evacuated metal, with a decrease in heat loss and an increase in the lining resistance, a decrease in the inert gas consumption for filling the vacuum chamber, and simplification of service conditions. The method of evacuating the metal during the casting process consists in creating a vacuum in the vacuum chamber, supplying a stream of metal from the steel pouring ladle to the intermediate ladle, vacuuming the metal stream through the vacuum chamber, terminating the flow from the steel pouring ladle, replacing the steel pouring ladle and resume the casting cycle, in this case, before being fed into the vacuum chamber, a metal stream is passed through a lock chamber connected to the vacuum wire, and after 85-95% of the metal flows from the steel pouring ladle, the casting speed is reduced to a value and I

A, B is the length and width of the bucket, h is the immersion depth of the nozzle in the metal, mm, r is the density of the metal, kg / m, t is the allowable time for replacing the steel pouring ladle, min, and after the supply of the metal stream from the steel pouring ladle is completed, before each change of the latter, the pressure in the airlock is equalized to atmospheric, supplying atmospheric air into it, and create a vacuum again after connecting to a new steel pouring ladle. The metal evacuation device during the casting process comprises a vacuum chamber 2 with a lid and a vacuum wire 7, a steel pouring ladle 1 with a shutter 5 and a skirt 11, hermetically docked with a vacuum chamber 2, and an intermediate ladle 4, a lock chamber 6 with a vacuum shutter 8, made with vertical 35 and horizontal 21 movement mechanisms, the lock chamber 6 is mounted on the cover of the vacuum chamber 2 and connected by a bypass line to the vacuum wire 7 and the atmosphere, the vacuum shutter 8 is made in the form of a movable plate 18 with a replaceable refractory funnel 19, m The horizontal movement mechanism 21 is made in the form of a rod 23 tightly passed through the lock chamber rack 6 of the rod 23, connected to the plate 18 by means of a shank with pins installed in the vertical grooves of the fork 27 provided on the plate 18, the vertical movement mechanism of the plate 18 is made in the form of two symmetrically located guides inserted in the side grooves provided on the plate 18 and mounted on levers 30, passed through the wall of the lock chamber 6 by means of vacuum-tight hinges with the possibility of their interaction acting with follower drive line.