RU1826932C - Method of making constant magnets of pasty mass of powder, mainly powder of rare-earth materials and device for its realization - Google Patents

Abstract

The invention allows the dose to be formed with the necessary degree of accuracy. A rigid bond of golden arches during the manufacture of magnets from rare-earth metals, which provides a high percentage of yield and material savings. Wet powder from the hopper 9 through the holes in the barrel 17 of the metering valve cylinder and in the piston 19 enters the cavity of the metering tank 12 of the metering unit, where the required dose of powder is formed for one product (magnet). Then, the dose through the spool device 16 and the feed pipe enters the press matrix -forms where the pressing process is carried out. The hopper 9 is equipped with a stirring mechanism, and the powder is supplied from the metering tank 12 to the spool device 16 of the dispenser and from the feed pipe to the matrix from below, 2 pp f-ly, 2 ill. SL С 09 I4D О О 00 К) с

Description

®ig.1

The invention relates to powder metallurgy, in particular to methods and devices for the manufacture of permanent magnets by wet pressing from an extruded suspension

In order to increase the yield due to maintaining a uniform dose density when it is fed into the mold in a device containing a multi-seat mold placed in an electromagnet with vertical channels made in the mold wall to supply doses of powder to the press cavity -forms connected from below, a hopper, additionally equipped with a stirring mechanism, comprising a drive shaft with blades made of non-magnetic material, a dispenser made in the form of sequentially mounted measuring tanks and spools th device alternately connecting the measuring container to the hopper and through the conduit with one of the cavities of the mold, is mounted under metering reservoir the spool device and the number represents the number of metering hoppers with stirring mechanism and the number of mold cavities. The powder is loaded through the hopper into the dispenser, a dose of powder is formed in the metering capacity of the metering device, then it is fed through the spool device of the metering device into the cavity of the mold and pressed, and a dose of powder is supplied from the metering tank into the metering device of the metering device and then fed from the spool device to the press -form is carried out along a vertical channel with a bottom supply,

In Fig, 1 shows the proposed device; FIG. 2 is a section AA in FIG. 1. The device contains a mold. 1, located in the electromagnet 2, the upper punch 3 with the drive 4 and the lower punch 5 with the drive b, also mounted in the electromagnet 2, through holes 7 are made in the lower part of the mold 1 for feeding the pressed mass into them, each of which has matrix 8, which forms the geometric shape of the products, the hopper 9, equipped with a stirring mechanism, consisting of a drive shaft 10 with blades 11 made of non-magnetic material, a dispenser consisting of sequentially installed measuring tank 12c located inside it with a piston 13 with a drive 14 (the piston 13 is regulated by a measuring nut 15) and a spool device 16, made in the form of a cylinder body 17 of a spool 17 and moving along it by a piston 19 drive 18, channels 20 and 21 in the mold 1 respectively, for supplying compressed air and for suctioning the liquid phase from the pressed

masses. Filters 22 are designed to filter the liquid phase during pressing and are made of porous material in the form of plates that repeat the shape of the ends of the punches 3 and 5 and are installed on their ends. In addition, the device includes a pipe 23 for supplying the pressed mass from the spool device 16 to a vertical channel 24 made in the wall of the mold, designed to directly supply doses of powder to the cavity of the mold and connected to the pipe 23 from below.

Two pairs of channels are made in the piston 19, each of which includes one rectilinear channel "25, and the second L-shaped channel at an angle of 90 ° C.

In addition, the mold is multi-seat. Each of the pressing cavities of the mold is connected through a layer to an individual vertical channel in the mold and to an individual feed line of the pressed mass with its own individual dispenser, which is one of several hoppers.

The matrix 8 is made of a magnetically conductive material. The upper 3 and lower 5 punches are all components of the dispenser, hoppers 9, and also the pipe 23 are made of non-magnetic materials.

Whenever possible, the spools are paired to shorten the compaction time.

The method is as follows

Suspension or wet powder (Sm Co alcohol) from the hopper 9, where it is thoroughly mixed to a single-phase mass due to the action of the stirring mechanism, through the cylinder barrel 17 of the valve 16 (through holes made in its walls) and rectilinear the channels 25 in the piston 19 of the spool device 16 fall into the cavity of the measuring container 12 due to the fact that the piston 13, moving downward, draws wet powder (the dose of the powder is regulated by a measuring nut 15) into the measuring container along with the drive 14. displacement piston 19 along the spool cylinder body by a step equal to the distance between the rectilinear and L-shaped channels of one pair, and two L-shaped channels are combined with their outlets on the one hand with measuring tanks 12, on the other hand with the powder supply pipe 23 in vertical channel 24. After this alignment, the piston 13 under the action of the actuator 14 begins to move up and thus pushes the dose of nopoiuKa up into

the spool device 16, and then through the pipe 23 and the vertical channel 24, into the die 8 located in the cavity of the mold 1 and into the pressing zone. In this case, as indicated above, the injection of the pressed mass into the cavity of the mold is also carried out.

The lower punch 5 is in its lowest position. Then, the punch 5 rises upward through the drive b and closes the feed outlet 25. The upper punch 3 is lowered, then the electromagnet 2 is turned on, creating in the matrix 8 and punch 3 a radial magnetic field of the desired size, which orientates the powder particles, and at the same time compresses the powder.

When pressure is applied through the filters 22 located at the ends of the punches, compressed air is supplied through the channel 20 under a certain pressure, and the liquid phase is removed from the powder through the channel 21 through a trap to the vacuum pump. After that, the pressing ends,

Claims (2)

1. A method of manufacturing permanent magnets from a paste-like mass of powder, mainly REM powder, by pressing method, comprising loading powder through a hopper into a dispenser, forming a dose of powder in a metering container of a dispenser, then feeding it through a spool device of the dispenser to a mold and pressing, characterized in that in order to increase the yield by maintaining a uniform dose density when it is fed into the npjscc form, the powder is mixed in the hopper, and a dose of 5 powder from the measuring container to the spool device of the dispenser and further feeding from the spool device to the mold are carried out on a vertical channel with a bottom supply. 0 2. A device for the manufacture of permanent magnets from a paste-like mass of powder, mainly REM powder, by pressing method, containing a multi-seat mold placed in an electric wire 5, a hopper, a dispenser made in the form of sequentially installed measured capacities m of a spool device alternately connecting said measuring tank with hopper and through 0 pipeline - from one of the cavities of the mold, characterized in that, in order to increase the yield by maintaining a uniform density of the dose of powder when it is fed into the mold, the device 5 is equipped with a mixing mechanism located in the hopper, comprising a drive shaft with blades made of non-magnetic material, vertical channels are made in the mold wall 0 to supply doses of powder into the cavity of the mold connected to the pipelines below, the measuring tank is installed under the spool device, and the number of dispensers corresponds to the number of hoppers with mixing mechanisms 5 and the number of mold cavities.