DE1608689B1 - Method for metered pouring of molten metal from ovens, pans or the like. - Google Patents

Description

1 605 689

It is known to melt fusible pieces of metal, for example in an induction furnace, "and that To cast molten metal in die casting machines, molds or the like. The pouring out of the molten liquid in a die-casting machine takes place via a pouring nozzle arranged on the crucible, with the furnace is tilted. After the die-casting machine with the required for the die-cast part to be produced Amount of molten material has been charged, the furnace is tilted back until there is no molten liquid more leaks over the pouring spout. When pouring liquid melt into the die casting machine However, it is very important that always the same amount of melt material from the furnace into the Die casting machine is filled. Practice has shown that it is extremely difficult Always the same amount of molten liquid from the furnace into the die-casting machine after each casting process bring in. Either the oven is tilted back too early, so that the filling quantity in the Die casting machine is too small to get usable die cast parts, or the furnace is running too late tilted back so that the liquid melt runs out of the die casting machine and thereby operational Malfunctions occur on the machine. It is also known to make the die casting machine liquid metal thereby to supply that a displacement body is introduced into the melt, its immersed volume releases a corresponding volume of molten metal to the die casting machine. This too The method has considerable disadvantages since the height of the bath level is subject to constant changes.

The invention has now set itself the task of To create a method for pouring molten metal from furnaces, pans, or the like, which the above avoids the disadvantages described. The invention consists in that up to the pouring spout A predetermined amount of metal by weight is added to the crucible filled with molten liquid during each casting process and at the same time the furnace for pouring off the same amount by weight of molten metal one which takes into account the increase in volume of the molten metal compared to the solid metal introduced Angular amount is tilted.

The crucible, which is completely emptied in the normal state, is first charged with a small amount of cold pieces of metal and, after connecting the induction coil to the power source, the cold metal is melted at a frequency of 50 to 10,000 Hz. Then further pieces of metal are added to the melt until the melt liquid is at the edge of the pouring spout. To cast a certain amount of molten metal, for example magnesium, in a die-casting machine or mold, for. B. 2000 cm ^{3 of} solid magnesium introduced into the melting liquid of the crucible. If the furnace with its crucible remained in a vertical position, ^{2000 cm 3 of} liquid magnesium would be poured off ^{when 2000 cm 3 of} solid magnesium were introduced from the pouring spout. But since 2000 cm ^{3 of} solid magnesium (specific weight 1.8) weigh 2000 x 1.8 g = 3600 g and 2000 cm ^{3 of} liquid magnesium (specific weight 1.4) weigh 2000 x 1.4 g; = 2800 g the equilibrium of 3600 g of liquid magnesium only exists when 2000 cm ^{3 of} solid magnesium are added to the crucible

2000 · 1 8

= 2570 cm ³

liquid magnesium can be squeezed out of the pouring spout. In order to obtain the volume of 2570 cm ^{3 of} liquid magnesium, the furnace is tilted forward by a certain angle in the direction of the pouring spout ^{when 2000 cm 3 of solid magnesium are introduced, so that 2000 cm 3} plus 570 cm ^{3 of} liquid magnesium are poured off immediately. The furnace is then tilted back into the normal position and after the solid magnesium has ^{melted from 2000 cm 3} to 2570 cm ^{3 of} liquid magnesium in the crucible, the next pouring process can be carried out by inserting another piece of metal. When the furnace was tilted back to its normal position, the level of the bath in the crucible and in the pouring spout, apart from the pieces of metal that was slightly melted during the time the furnace was tilted forward and back, decreased by the amount of space that was due to the different specific weights of the solid metal result in liquid metal. This has the advantage that when the furnace is tilted back, the liquid strand of the melt is immediately interrupted, so that an undesirable drop-wise outflow of the melt material from the pouring spout is eliminated.

Claims (1)

Claim: Method for the metered pouring of molten metal from ovens, pans or the like Crucibles are provided with a pouring spout, with metal pieces being inserted into the crucible, characterized in that it is filled with molten liquid up to the pouring spout A predetermined amount of metal by weight is added to the crucible with each casting process at the same time the furnace for pouring the same amount of weight of molten metal around a die Increase in volume of the molten metal compared to the imported solid metal into account Angular amount is tilted.