JPH0488604A - Method of wet-pressing oxide permanent magnet material in magnetic field and its molding device - Google Patents

Abstract

PURPOSE:To easily open when a molded body is removed from a mold by a method wherein the compressed gas such as air and the like is introduced through the porous sintered body provided on the top surface of the lower punch when the molded body is demolded. CONSTITUTION:An oxide magnetic powder suspended slurry is pressurefed and filled in the cavity formed by the upper punch 12, a die 11 and the lower punch 13 by the working of a cylinders 15 and 16. When the upper punch 12 is lowered further and the slurry is pressed after the slurry has been fed, the water in the slurry is filtered by a filtering material 19, it is pushed out into liquid exhausting holes, exhausted to outside from a liquid exhaust path 20, the magnetic powder is compressed by the upper punch 12 and the lower punch 13, and a square molded body 21 of prescribed shape can be formed. Then, compressed air is introduced from a compressing gas introducing path 3 provided on the lower punch 13. Subsequently, square-shaped molded body 21 is obtained by the working of the cylinders 15 and 16.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method and a molding apparatus for molding an oxide permanent magnet material in a wet magnetic field.

<Conventional technology> Generally Mo 6PetOs (M is Ba or Sr
In order to form a material for an oxide permanent magnet in a desired shape in a wet magnetic field, the material for an oxide permanent magnet consisting of The powder suspension slurry is press-fitted, and then pressure is applied to the upper and lower punches while an external magnetic field is applied to mold the cavity while water, etc. in the cavity is filtered out by a filter provided on the upper punch side. At this time, in order to improve the ease of removing the molded product from the mold, an organic female molding material is applied to the top surface of the lower punch when forming the cavity.

However, if the molding agent is not applied sufficiently, the molded product will adhere to the top of the lower punch when taken out from the mold, making it difficult to mold, and even if the mold is released, the molding will remain on the top surface of the lower punch. Parts of the molded body were brought into close contact with each other, creating a recess on the side of the molded product, resulting in poor molding, which was one of the causes of a decrease in the yield of the molded product.

In addition, the 1M molding agent is expensive, which is a factor that increases manufacturing costs, and the female molding agent is contaminated with an organic solvent, which poses a problem of deteriorating the working environment for molding.

<AS to be Solved by the Invention> An object of the present invention is to propose a method and apparatus for molding a material for a wet oxide magnet that does not require the use of a mold release agent and is easily released from the mold.

<Means for Solving the Problems> In other words, in the present invention, an oxide magnetic powder suspension slurry is press-filled into a cavity formed by the bottom surface of the upper punch, the top surface of the lower punch, and the peripheral wall surface of the die, and then While applying an external magnetic field, pressure is applied to the upper and lower punches to filter out water in the cavity using a filter provided on the upper punch side, forming a permanent magnet material into the desired shape, and demolding the molded body. A material for an oxide permanent magnet in a wet magnetic field, characterized in that compressed gas such as air is introduced between the molded body and the top surface of the lower punch through a porous sintered body provided on the top surface of the lower punch. This is a forming method for a permanent magnet material, in which a cavity is formed from an upper punch, a lower punch, and a die, and a magnetic field coil surrounding the die is formed. A permanent oxide in a wet magnetic field, characterized in that the bodies are laminated and compressed gas such as air is introduced through an introduction channel provided inside the lower punch so that it is almost uniformly dissipated from the surface of the porous sintered body. Made of molded magnet material! It is.

Note that porous sintered bodies include metals and ceramics.

Functions and Examples> Examples of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is a side view of a lower punch for forming an angular shaped body showing one embodiment of the present invention, and 1 is a sintered metal obtained by a powder metallurgy method. 2 is a dispersion groove for introducing compressed air into the sintered metal, and 3 is an introduction path leading to the dispersion groove.

FIG. 2 shows the main parts of a mold for forming an angular shaped body, in which 11 is a die, 12 is an upper punch, and 13 is a lower punch.

A magnetic field coil 14 is attached to the outer periphery of the die 11, and is used to orient the magnetic powder during molding.

Each punch 12 and 13 can be moved up and down by a cylinder 15.16, with the upper punch 12 descending and contacting the upper surface of the die 11, and the lower punch 13 touching the upper surface of the die 11.
Pressure forming is performed by ascending the through-hole provided at 1. Therefore, the slurry of oxide magnetic powder is filled into the cavity formed by the upper punch 12, the lower punch 13, and the peripheral wall surface of the die 11. A supply path 17 is formed in the die 11 and communicates with the cavity. The top surface of the lower punch 13 is made of porous sintered metal and is in contact with a dispersion groove 2 for introducing compressed air, and the dispersion groove 2 communicates with the introduction path 3.

The upper punch 12 is provided with a plurality of drainage holes 18 for discharging water pushed out from the slurry by pressurization to the outside, and these drainage holes communicate with a drainage channel 20. Furthermore, a filter body 19 is attached to the upper punch 12 side,
When pressurized, only water is pushed out into the drain hole 18, and the magnetic powder is stored in the cavity.

Next, a case in which an angular shaped body of oxide magnetic powder is formed in a wet magnetic field using the apparatus configured as described above will be described with reference to FIG. 2.

The die 11 is raised by actuation of the cylinder 16. Next, the upper punch 12 is lowered by the operation of the cylinder 15 and comes into contact with the upper surface of the die 11, and a cavity for molding is formed by the upper punch 12, the die 11, and the lower punch 13, and the oxide is formed in this cavity. A magnetic powder suspension slurry is pumped and filled. This pressure feeding is performed through a supply path 17 opened in the cavity.

After this slurry supply, the upper punch 12 further descends to pressurize the slurry. Due to this pressurization, the water in the slurry is filtered by the filter body 19, pushed out into the drain hole 18, and discharged to the outside through the drain channel 20, and the magnetic powder is compressed by the upper punch 12 and the lower punch 13. A square molded body 21 having a predetermined shape is formed.

Next, compressed air is introduced from the compressed gas introduction path 3 provided in the lower punch 13. Next, the upper punch 12 is raised by the operation of the cylinder 15, and then the upper punch 12 is raised by the operation of the cylinder 15.
The square shaped body 21 is lowered by the operation of the die 11.
get.

According to the method of the present invention, when the molded product is removed from the mold, the molded product does not come into close contact with the top surface of the lower punch, and can be easily released from the mold. Furthermore, since no mold release agent is required, manufacturing costs can be lowered, and deterioration of the working environment can be prevented.

Compressed gas is not particularly limited, but it must be safe to handle and
And cheap air is preferable, and the pressure of compressed gas is 1
The effect is recognized if the pressure is above kg/cd gauge pressure.

<Effects of the Invention> The present invention provides a method for compressing air, etc. through a porous sintered body provided on the top surface of a lower punch when demolding a molded body when performing wet-type Mi in-situ molding of a material for an oxide permanent magnet. By introducing gas 1. When the molded product is removed from the mold, the molded product does not come into close contact with the top surface of the lower punch, and can be easily released from the mold. Furthermore, since no mold release agent is required, manufacturing costs can be lowered, and the work environment can be prevented from deteriorating.

[Brief explanation of the drawing]

FIG. 1 is a side view of a lower punch for forming an angular shaped body showing one embodiment of the present invention, and FIG. 2 is a side view showing the main part of a mold for the angular shaped body. 1... Porous sintered body, 2... Dispersion groove, 3...
・Introduction path, 11...Dice, 12...
Upper punch, 13...Lower punch, 14...
Magnetic field coil, 16... Cylinder 18... Drain hole, 20... Drain channel, 15... Cylinder 17... Supply channel, 19... Filter body, 21... Molded body. Happy Figure 1■ 2I! !

Claims (2)

[Claims] 1. The oxide magnetic powder suspension slurry is press-filled into the cavity formed by the bottom surface of the upper punch, the top surface of the lower punch, and the peripheral wall surface of the die, and then pressure is applied to the upper and lower punches while applying an external magnetic field to form the cavity. While molding the permanent magnet material into the desired shape while filtering and removing water in the tee with a filter provided on the upper punch side, when demolding the molded product, the porous material provided on the top surface of the lower punch is used. A method for forming a material for an oxide permanent magnet in a wet magnetic field, characterized by introducing compressed gas such as air through the sintered body between the formed body and the top surface of a lower punch. 2. In an apparatus for forming a permanent magnet material, a cavity is formed from an upper punch, a lower punch, and a die, and a magnetic field coil surrounding the die is used. A porous sintered body is laminated on the top surface of the lower punch, 1. An apparatus for forming a material for an oxide permanent magnet in a wet magnetic field, characterized in that a compressed gas such as the above gas is introduced through an introduction path provided inside the lower punch so that it is almost uniformly dissipated from the surface of the porous sintered body.