JPH10163054A - Manufacture of globular cu-ni-fe allot magnet with anisotropy in equatorial shape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a sound globular Cu-Ni-Fe alloy magnet with anisotropy in an equatorial shape. SOLUTION: In the manufacturing method, a Cu-Ni-Fe alloy powder comprising Ni: 5-25wt.%, Fe: 5-25wt.% and Cu and unavoidable impurities in the other part is prepared by a gas-atomizing manner, and a metallic vessel is charged with the powder and sealed, and it is extruded with a hot extruding device at 900 deg.C above and at a distortion speed of 10s<-1> or above, and then a metal material on the surface of the extruded material derived from the metallic vessel is removed. The anisotropy is imparted to the extruded material in its form by cold drawing working, and then an anisotropically converted bay material in a drawing direction is globularly forged in the direction parallel to that of anisotropy. Alternatively after anisotropy is imparted to the extruded material in the form by cold drawing, solution heat treatment is performed to impart isotropy, and then the drawn material is globularly forged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an equatorially anisotropic spherical Cu--Ni--Fe mainly used for various devices and the like.
The present invention relates to a method for manufacturing a magnet alloy.

[0002]

2. Description of the Related Art Cu-Ni-Fe alloys are 60% Cu, N
A practical magnet alloy represented by a composition of i20% and Fe20% (see Japanese Patent Publication No. 55-9814 and Japanese Patent Publication No. 55-4248).
When aged at around ° C., the γ phase separates into two phases, a ferromagnetic γ ₁ phase of Ni-Fe-rich and a non-magnetic γ ₂ phase of Cu-rich. At that time, the reaction proceeds by spinodal decomposition. The extended slender gamma ₁ phase by cold working, thereby improving the coercive force and squareness. This Cu-N
The application of the i-Fe magnet alloy as a practical material is mainly a wire rod for a magnetic scale. In the past, this material was made into an ingot by casting, solution-processed, then made into a rod-like material by hot extrusion, then made into a wire by cold drawing or swaging, and then anisotropically shaped. It has been processed to develop the desired magnetic properties. There is also a manufacturing method using a powder method instead of a method for manufacturing an ingot by a casting method. This is to produce an alloy powder of the desired composition by a water atomizing method, perform reduction treatment, fill a metal container, heat to a predetermined temperature, produce a rod-shaped material by hot extrusion, and then cast As in the ingot method, the wire is processed into a wire by cold drawing or swaging to anisotropically shape the wire and then subjected to aging treatment to develop desired magnetic properties.

[0003]

SUMMARY OF THE INVENTION The above-mentioned Cu-Ni-F
Although e-alloys were mainly used as wire rods, in recent years the use of equatorially anisotropic spherical magnets has attracted attention in various devices, and production has been studied according to their needs. However, in the present alloy produced by the melt solidification process, two regions of a primary crystal and a residual liquid solidified portion are generated at the time of solidification, and component segregation cannot be avoided due to this. Cu-Ni-Fe with spinodal decomposition
In the production of a system alloy, decomposition occurs during the cooling process after solidification, and this cannot be avoided. Cu-Ni-Fe
In the method for producing an alloy, in a casting method, a so-called spinodal decomposition occurs in a cast ingot at the time of cooling after solidification, and a region of Cu-rich and Fe-Ni-ric
Since it is composed of two regions of the h region, component segregation is likely to occur. If this is to be uniform, it is necessary to form a solution at a high temperature of 1000 ° C. or higher. In particular, the size of the crystal grains of the ingot produced by the casting method increases in proportion to the size of the ingot, that is, the reciprocal of the solidification rate during casting. In addition, the occurrence of casting defects during solidification cannot be avoided. Such coarsened crystal grains and casting defects cause problems such as grain boundary cracks during the cold working in the subsequent step and poor magnetic properties resulting therefrom. If a spherical magnet is manufactured by forging, cracks due to this defect will also occur.

[0004] In order to solve such a problem, production by a powder metallurgy method capable of obtaining a finer structure than the casting method can be considered.

In the powder metallurgy method, an alloy powder having a desired composition is produced by a water atomizing method without performing a method of producing an ingot by a casting method, and after reduction treatment, the alloy powder is transferred to a metal container. After filling, a rod-shaped material is produced by heating at a predetermined temperature and hot extrusion.

However, in the conventional powder metallurgy method, boundaries between powders often remain as grain boundaries after solidification and molding, and these grain boundaries are broken when forged into a sphere similarly to the case of cast materials. cause.

As shown in FIG. 2, it is possible to produce a spherical magnet by cutting from a wire produced by the above-described casting method or powder metallurgy method.
The spherical magnet produced by the cutting process maintained the anisotropy of the wire, and a spherical magnet anisotropic in the equatorial direction could not be produced.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a sound-free, crack-free sound without causing various problems found in the prior art. It is an object of the present invention to provide a technology for realizing the production of an equatorially anisotropic spherical magnet.

The gist of the present invention is as follows. Ni: 5 to 25% by weight, F by gas atomization
e: A Cu—Ni—Fe alloy powder composed of 5 to 25% by weight, with the balance being Cu and unavoidable impurities, was prepared and filled in a metal container, which was then heated to 900 ° C. or higher by a hot extruder. Extruded at a large strain rate of 10 s ⁻¹ or more, then the metal material from the metal container on the surface of the extruded material is removed, and then the extruded material is anisotropically shaped by cold drawing. An equatorially anisotropic spherical Cu-Ni-Fe alloy magnet characterized in that a spherical forging process is performed in a direction parallel to a direction in which a bar material anisotropic in a drawing direction is anisotropic. 1. The manufacturing method of Ni: 5 to 25% by weight, F by gas atomization
e: A Cu—Ni—Fe alloy powder composed of 5 to 25% by weight, with the balance being Cu and unavoidable impurities, was prepared and filled in a metal container, which was then heated to 900 ° C. or higher by a hot extruder. The extruded material was extruded at a large strain rate of 10 s ⁻¹ or more, then the metal material derived from the metal container on the surface of the extruded material was removed. A spherical Cu-Ni anisotropically deformed in the equatorial direction, characterized by performing isotropic heat treatment to make it isotropic and then subjecting the drawn material to spherical forging.
2. the method for producing an Fe alloy magnet; The strain rate during spherical forging is from 0.1 s ^-1 to 50 s ^-1
The spherical Cu- according to the above 1 or 2, wherein
3. a method for manufacturing a Ni—Fe alloy magnet; The method for producing a spherical Cu—Ni—Fe alloy magnet according to any one of the above items 1, 2 or 3, wherein the temperature at the time of the spherical forging is from room temperature to a spinodal decomposition temperature of 600 ° C.

According to the production method of the present invention, an alloy powder having a particle size of usually 1 mm or less is produced by a gas atomization method so as to obtain a desired composition, and this powder is filled and sealed in a metal container, and then hot-pressed. The extruder extrudes at a high strain rate of 900 ° C. or more and a strain rate of 10 s ⁻¹ or more, and then anisotropically shaped by cold drawing as shown in FIG. 3 to obtain a rod material anisotropic in the drawing direction. By performing forging in the direction parallel to the direction anisotropically cold, it can be processed into a spherical magnet without cracking, and when it is processed into the spherical magnet, the direction is perpendicular to the anisotropic direction. This is a method capable of manufacturing a Cu-Ni-Fe alloy magnet anisotropically oriented in the equatorial direction of a certain spherical magnet.

Further, as in the invention according to the second aspect of the present invention, the anisotropy in the equatorial direction can be further increased by using a drawn material used for forging which is made isotropic by solution heat treatment. It is possible to manufacture a Cu-Ni-Fe alloy magnet prepared as described above. In the above method, when the deformation resistance value at the extrusion temperature is small, when the strain rate at the time of extrusion is small, the extrusion starts before the packing density is sufficiently increased in the extrusion die, and the density of the extruded material is low. State. On the other hand, the strain rate 1
By extruding at a large strain rate of ^{0 s -1} or more, the extruded material can be filled at a high density of 98% or more in a die during extrusion.

Regarding forging of the drawn material, if forging is performed in a direction perpendicular to the direction in which the drawn material is anisotropically, a tensile force is applied in the anisotropic direction of the drawn material, as shown in FIG. It is the same as a spherical magnet manufactured by cutting from a conventional wire rod. By performing forging in a direction parallel to the anisotropic direction of the drawn material, a spherical magnet anisotropically anisotropic can be manufactured from the anisotropic drawn material.

Further, the anisotropic drawn material is subjected to a heat treatment at, for example, a solution heat treatment temperature of 1030 ° C. for 30 minutes, water-cooled to make the drawn material isotropic, and the drawn material is subjected to spherical forging. In addition, a spherical magnet anisotropically anisotropic can be manufactured. In this case, it is possible to further increase the anisotropy in the equatorial direction.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The operation of the present invention is as follows. The Cu-Ni-Fe alloy is a practical magnet alloy composed of Ni: 5 to 25% by weight, Fe: 5 to 25% by weight, the balance being Cu and unavoidable impurities. When aged around ℃, γ phase becomes N
separating the i-Fe-rich 2 phase non-magnetic gamma ₂ phase ferromagnetic gamma ₁ phase and Cu-rich of. At that time, the reaction proceeds by spinodal decomposition. And γ by cold working
_One phase is elongated, and the γ ₁ phase is anisotropic in the direction in which it extends.Forging work is performed in the direction parallel to the anisotropic direction, and the tensile force acts in the equatorial direction of the spherical magnet. It is considered to be anisotropic in the shape of the equator.
The same can be said for the case where a rod material anisotropically formed by drawing is subjected to a solution heat treatment and then forged.

[0015]

【Example】

[Example 1] Cu, Ni and Fe were each contained in a weight ratio of 72.
%, 20% and 8%, weighed and blended, melted in a vacuum induction melting furnace, and then argon gas atomized.
The alloy powder having an average particle size of 126 μm was produced. After filling the prepared alloy powder into a metal container made of carbon steel, degassing and sealing, the temperature is 1000 ° C., the strain rate is 10 s ⁻¹ and the diameter is 160 mm.
And extruded to φ20 mm to produce an extruded rod. The metal material derived from the metal container on the surface of the extruded rod was removed by pickling. Next, this rod was subjected to cold drawing to produce a wire having a diameter of 3 mm anisotropic in the drawing direction. This wire was cut out, and cold spherical forging was performed at a strain rate of 0.1 s ^-1 in a direction parallel to the anisotropic direction to produce a spherical magnet of φ5 mm. As a result, a spherical magnet having desired magnetic properties was obtained.

Example 2 Cu, Ni, and Fe were weighed and blended so as to be 65%, 20%, and 15% by weight, respectively, melted in a vacuum induction melting furnace, and then subjected to argon gas atomization to obtain average particles. The alloy powder having a diameter of 126 μm was produced. The prepared alloy powder was filled, degassed, and sealed in a carbon steel metal container, and then extruded from φ160 mm to φ20 mm at a temperature of 1000 ° C. and a strain rate of 10 s ⁻¹ to produce an extruded rod. The metal material derived from the metal container on the surface of the extruded rod was removed by pickling. Next, the rod was subjected to cold drawing to produce a φ8 mm wire that was anisotropic in the drawing direction. This wire is cut out and cold spherical forging is performed at a strain rate of 0.1 s ^-1 in a direction parallel to the anisotropic direction.
A 5 mm spherical magnet was produced. As a result, a spherical magnet having desired magnetic properties was obtained.

Example 3 Cu, Ni, and Fe were weighed and blended to be 72%, 20%, and 8% by weight, respectively, melted in a vacuum induction melting furnace, and then subjected to argon gas atomization to obtain an average particle size. The alloy powder having a diameter of 126 μm was produced. Filling the prepared alloy powder into a carbon steel metal container
After degassing and sealing, φ at temperature 1000 ° C and strain rate 10s ^-1
The extruded bar was extruded from 160 mm to φ20 mm. The container metal material on the surface of the extruded rod was removed by pickling. Next, the rod was subjected to cold drawing to produce a φ8 mm wire that was anisotropic in the drawing direction. This wire is cut out, and cold spherical forging is performed in a direction parallel to the anisotropic direction at a temperature of 300 ° C. and a strain rate of 30 s ^−1.
A 15 mm spherical magnet was produced. As a result, a spherical magnet having desired magnetic properties was obtained.

Example 4 Cu, Ni, and Fe were weighed and blended so as to be 65%, 20%, and 15% by weight, respectively, melted in a vacuum induction melting furnace, and then subjected to argon gas atomization to obtain average particles. The alloy powder having a diameter of 126 μm was produced. The prepared alloy powder was filled, degassed, and sealed in a carbon steel metal container, and extruded from φ160 mm to φ50 mm at a temperature of 1000 ° C. and a strain rate of 10 s ⁻¹ to produce an extruded rod. The metal material derived from the metal container on the surface of the extruded rod was removed by pickling. Next, this rod was subjected to cold drawing to produce a φ20 mm wire rod anisotropic in the drawing direction. This wire is cut out and cold spherical forging is performed at a temperature of 300 ° C. and a strain rate of 30 in a direction parallel to the anisotropic direction.
Performed at s ⁻¹ to produce a spherical magnet of φ30 mm. As a result, a spherical magnet having desired magnetic properties was obtained.

Example 5 Cu, Ni, and Fe were weighed and blended so as to be 65%, 20%, and 15% by weight, respectively, melted in a vacuum induction melting furnace, and then subjected to argon gas atomization to obtain an average particle size. The alloy powder having a diameter of 126 μm was produced. The prepared alloy powder was filled, degassed, and sealed in a carbon steel metal container, and extruded from φ160 mm to φ50 mm at a temperature of 1000 ° C. and a strain rate of 10 s ⁻¹ to produce an extruded rod. The metal material derived from the metal container on the surface of the extruded rod was removed by pickling. Next, this rod was subjected to cold drawing to produce a φ20 mm wire rod anisotropic in the drawing direction. After making the wire isotropic by liquid heat treatment,
This wire was cut out, and cold spherical forging was performed in a direction parallel to the anisotropic direction at a temperature of 300 ° C. and a strain rate of 30 s ⁻¹ to produce a spherical magnet of φ30 mm. As a result, a spherical magnet having desired magnetic properties was obtained.

[0020]

As described above, the present invention relates to a forging of a spherical Cu-Ni-Fe alloy magnet which could not be produced by a cutting process after anisotropically using a cast material or a powder material. Thus, it is possible to produce a sound sphere and a sphere-like equatorially anisotropic magnet without causing problems such as cracks, and the present invention is a useful invention that meets the needs of the industry. In addition, the invention enables mass production of spherical magnets anisotropically anisotropic, and is an industrially useful invention.

[Brief description of the drawings]

FIG. 1 shows spherical Cu—Ni produced by the production method of the present invention.
FIG. 2 is a schematic view of an Fe alloy magnet.

FIG. 2 is a schematic view of a manufacturing process of a spherical Cu—Ni—Fe alloy magnet by a conventional method.

FIG. 3 is a schematic diagram of a manufacturing process of a spherical Cu—Ni—Fe alloy magnet according to the present invention.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI // C22F 1/00 660 C22F 1/00 685 685 687 687 694 694 H01F 1/08 A

Claims (4)

[Claims] 1. Ni: 5 to 25 by a gas atomizing method.
% By weight, Fe: 5 to 25% by weight, the balance being Cu and unavoidable impurities, to prepare a Cu—Ni—Fe alloy powder,
This powder is filled and sealed in a metal container, and is extruded with a hot extruder at 900 ° C. or more at a large strain rate of 10 s ⁻¹ or more, and then the metal material derived from the metal container on the surface of the extruded material is removed. The extruded material is then anisotropically shaped by cold drawing, and then subjected to spherical forging in a direction parallel to the direction in which the anisotropically shaped bar is drawn in the drawing direction. A method for producing a spherical Cu-Ni-Fe alloy magnet anisotropically oriented in an equatorial direction. 2. Ni: 5 to 25 by a gas atomizing method.
% By weight, Fe: 5 to 25% by weight, the balance being Cu and unavoidable impurities, to prepare a Cu—Ni—Fe alloy powder,
This powder is filled and sealed in a metal container, and is extruded with a hot extruder at 900 ° C. or more at a large strain rate of 10 s ⁻¹ or more, and then the metal material derived from the metal container on the surface of the extruded material is removed. Removing, and then extruding the extruded material by cold drawing to make it anisotropic, then performing solution heat treatment to make it isotropic, and then subjecting the drawn material to spherical forging. A method for producing a spherical Cu-Ni-Fe alloy magnet anisotropically shaped. 3. The method for producing a spherical Cu—Ni—Fe alloy magnet according to claim ¹ , wherein the strain rate during the spherical forging is from 0.1 s ⁻¹ to 50 s ⁻¹ . 4. The spherical Cu—Ni— alloy according to claim 1, wherein the temperature during the spherical forging is from room temperature to a spinodal decomposition temperature of 600 ° C.
Manufacturing method of Fe alloy magnet.