SU152283A1 - Permanent Magnet Casting Device - Google Patents

Description

Permanent magnet casting devices are known that are provided with molds with draw mechanisms.

The described device for casting permanent magnets differs from the known ones in that it consists of a rotary heating gas furnace, on a rotary hearth of which are placed molds with exhaust mechanisms, and a funnel installed in the roof of the furnace for pouring metal into the molds. This embodiment of the device allows you to automate the process of casting magnets.

FIG. 1 shows the proposed device, a general view and a section along A-A; in fig. 2 is a diagram of the arrangement of the mold relative to the pouring funnel at different times during the movement of the carrier ring at a constant speed; in fig. 3 is an electrical diagram of a carrier ring drive when moving at a constant speed.

The proposed device for casting permanent magnets with directional solidification consists of two main parts: fixed and mobile. The fixed part, mounted on a rigid metal frame, is a gas ring furnace Y and a drive 2 of rotation of the carrier ring 3, which serves as a moving part. On ring 5, twenty identical crystallization cells 4 are installed. By means of a carrier ring, cells are introduced into the furnace, moved therein and removed from the furnace. The carrier ring rotates around a fixed axis 5 on the rollers 6 and is driven in continuous motion with a constant n ° 152283-2 -

Noah speed 1.74 mm / sec drive 2 using friction gear 7, consisting of a roller and a friction pulley.

The main element of the crystallization cell is a water-cooled copper cooler 8, equipped with a slow (5 mm / min) mechanism for lifting and fast (1000 mm / min) lifting. A refractory mold 9 is installed on the refrigerator. The vertical movement mechanism consists of an electric motor 10, a gearbox 11 with two free shaft ends, the spindle screws 12 and a nut 13 rotating with worm gears.

The gearbox has two gear ratios, the transition from one type of movement to another is achieved by reversing the motor and switching the clutch speed, which is activated automatically by an inductive sensor.

Water is supplied to the coolers of the crystallization cells through the ring distributor 14, and the energy is supplied by means of three contact rings 15 and Ib brushes. Water is drained from each well through pipe J7 to the annular discharge chute 18.

The device "has four zones: preparation, heating forms, crystallization and unloading. In the preparation area of the molds, the refractory mold 9 is poured onto the main cooler 5, and the refractory muffle 20, which serves to reduce air leaks into the furnace chamber, is placed on the auxiliary ring cooler 19. For this purpose, an O-ring seal 21 is used, consisting of two channels and a hose filled with running water.

Due to the rotation of the carrier ring, crystallization cells with forms enter the preheating zone of the gas furnace. The gas furnace, lined with several layers of refractory materials, has an annular working chamber, on the outer side of which ten gas burners 22 are installed, providing the desired temperature curve. When the mold fits into hole 23 of the Chl alloy fill, it will be heated to 1500 °. Combustion products are removed from the furnace through channel 24 to the exhaust ventilation system.

The movement of the carrier ring at a constant speed of 1.74 mm / s ensures that the mold is filled with an alloy for 100 seconds. The control over the input of the mold under the pouring, the time of the pouring of the mold and the exit of the mold from under the pouring is carried out automatically as follows. When 5 seconds of motion remain before the priming funnel, the inductive 1DI sensor (Fig. 3), using the IP relay, switches on the yellow LV warning light (the signal is “prepared). At the moment of installation of the mold under the pouring funnel, the yellow warning lamp turns off and the green warning lamp LZ (“fill” signal) turns on, which is performed by an inductive 2DI sensor using a 2P relay. At the moment when the mold leaves the filling funnel, the red warning lamp LK is turned on. (“stop filling” signal), performed by inductive ZDI sensor using relay ZR.

When the mold is flooded with an alloy, it begins to move into the crystallization zone, an inductive sensor is installed, which is installed in the motor control system of the lowering mechanism, and the mold with a cooler will slowly leave the furnace chamber. By the time the cell leaves the furnace, the form will completely fall out of its chamber.

At the exit of the furnace, the second inductive sensor turns on the speed switching electromagnet and simultaneously reverses the electric motor, as a result of which the form refrigerator returns to its upper position, where the muffle and mold with cast magnets are unloaded. Then the crystallization cell enters the area of preparation of the forms, and the magnets for further processing. The low speed of movement ensures safety and convenience in working in the areas of unloading of filled forms and installation of new ones.

Subject invention

A device for casting permanent magnets, equipped with molds with exhaust mechanisms, characterized in that, in order to automate the casting of magnets, it consists of a rotary heating gas furnace, on a rotary hearth of which are placed molds with exhaust mechanisms, and a funnel installed in the vault of the furnace for pouring metal into molds.

No. 152283