SU112421A1 - High vacuum induction melting furnace - Google Patents

Description

High-melting induction melting furnaces with preliminary degassing and electric heating of the forms are used to melt high-temperature alloys and to fill the molds by casting in vacuum.

In order to ensure that molds are cast and unloaded without breaking the vacuum in the casting chamber of the furnace, it is proposed to apply a mechanism made in the form of a platform moving along the rollers using a system of rotating shafts, sprockets and rack and pinion gearing. This mechanism feeds the mold into the casting chamber through a vacuum gateway connecting it to the degassing chamber.

A feature of the furnace described here is also the use of a vacuum loading chamber in it with a gateway and a device that provides mechanical loading of the charge without breaking the vacuum; It is also proposed to use coaxial water inlet and power supply for the inductor, to mount the melting furnace unit on the pivot door of the vacuum chamber, to apply a dispenser for additives located in a vacuum chamber with a sluice, as well as devices for removing slag, precipitating the charge and walling and taking metal samples vacuum disturbance in the casting chamber.

FIG. 1 and 2 two projections of the proposed furnace are shown; in fig. 3-diagram of coaxial input to the furnace; in fig. 4 is a diagram of devices for sampling and precipitating the charge.

The molds to be poured into the pre-degassing chamber 1, which is equipped with an electric heater 2. The degassed molds 3 are moved under the casting by means of a feeding mechanism through an evacuated gateway 4 into the casting chamber 5.

The mold supply mechanism is made in the form of a platform 6, which moves over the rollers with the help of sprockets 7, which are driven from the drive shaft 8JVb 112421

When the shaft rotates, the sprocket 7, located inside the chamber / degassing, alternately engage with the platform rail and move it together with the installed molds 3 along the rollers of the roller table 9.

When feeding the platform 6 into the casting chamber, each form 3 is alternately placed under the drain tip of the crucible 10. When the latter forms are poured, the front part of the platform is retracted into the dead channel //.

The metal is smelted by an induction melting unit, which consists of inductor 12, crucible 10, power communications 13, cooling communications and a turning mechanism 14.

The melting furnace unit is illuminated by means of a bracket 15 on the pivot door 16 of the vacuum chamber. Such an installation of the unit allows it to be quickly removed to the atmosphere in working condition by turning the door 16 and it is easy to inspect, repair and replace the inductor and the crucibles.

A coaxial input is used to supply energy and water to the inductor, which is also an element of the device for turning the crucible during metal casting. The crucible is rotated by a pair of gears 20 driven by a reversing drive. Water to cool the inductor enters the tube 17, washes in the inductor 12 and exits through the concentric gap between the scrubbers 18 to the atmosphere. The voltage on the inductor flows through the copper tube 17 and the jacket 18.

Charging to the crucible before melting is carried out from container 21 using a loading device. It is made in the form of grippers 22 moving by means of a drive 23 and a cable along guide posts 24.

The loading mechanism also allows the loading of bins as a whole blank (without a container). In this case, the pig directly illuminates the grippers 22 and sinks into the crucible, after which the hydraulic gates 25 release the pig from the grippers. In order to add additives during the smelting process, the furnace is equipped with a metering unit 26 with an electric heater 27, in which the degassing of preheated pulpit 28 is carried out at the same time. vacuum in the casting chamber. A tilting tray 30 is installed in the furnace, which serves to soften the impact of the crucibles falling from the dispenser of the powder.

To sample metal without breaking the vacuum, to insert a thermocouple 31 into the casting chamber and to add deoxidizers and modifiers to the crucible, the furnace is equipped with a device made in the form of a vacuum cylinder 32 cut off from the casting chamber by gateway 33. These samples and the introduction of additives.

A rod 35 with a bellows 36 is pivotally mounted on the wall of the casting chamber to upset a broom in a crucible.

Removing metal from metal during smelting and removing crucibles from the crucible after each melting is carried out by a baffle made in the form of a rod 37 fixed on the hinge 38 in the front door and fitted with a bellows 39. using the mudstone 40.

Subject invention

Claims (7)

1. High vacuum induction casting furnace with preliminary degassing and electric heating of forms, characterized in that, in order to ensure that the forms are fed for casting and unloading of forms without breaking the vacuum in the casting chamber, a mechanism made in the form of rotating shafts, sprockets and rack-and-pin the engagement and feeding the molds into the casting chamber through an evacuated gateway connecting the degassing chamber to the casting chamber. 2. Baking pop 1, characterized in that, in order to ensure mechanical loading of the charge without breaking the vacuum, it is equipped with a vacuum loading chamber with a gateway and a device made in the form of grips, moved by means of a drive and a cable along guide posts suspension of the charge. 3.Pech on PP. 1 n 2, differing from the fact that, in order to increase reliability in operation and save energy, it uses coaxial water inlet and power supply for the inductor, which is also an element of the device for turning the crucible inductor during mold casting. 4.Pech on PP. 1-3, characterized in that, in order to provide a more convenient and quick removal of the crucibles from the vacuum chamber for inspection and repair, the melting furnace unit is mounted on the pivot door of the vacuum chamber. 5.Pech on PP. 1-4, characterized in that, in order to ensure the introduction of additives degassed in a heated state into the furnace without breaking the vacuum, it is provided with a dispenser arranged in a vacuum chamber with a lock, made in the form of sectional rotary compartments and having electric heating. 6. Bake by CPU. 1-5, characterized in that for removing slag, precipitating rash and scaling without breaking the vacuum in the casting chamber, devices made in the form of rods fixed to a joint in the wall of the casting chamber and fitted with a bellows are used. 7.Pech on PP. 1-6, characterized in that, in order to sample metal without breaking the vacuum, a device made in the form of an evacuated cylinder cut off from the casting chamber by a lock and equipped with a rod with a nozzle for sampling was used. L. S To Pump V ; | rAll / H × - To L pump / (pump