JPH01318208A - Cylindrical multipole magnet constituting body - Google Patents

Abstract

PURPOSE:To obtain magnetic pole position, magnet force strength, and magnetic pole width by melting and casting an alloy which basically consists of a rare- earth element, a transition metal, and boron, covering it with a soft magnetic material or a material used being attached to a magnet, and using a rare-earth magnet subjected to hot processing and heat treatment are performed. CONSTITUTION:With a permanent magnet 201, an alloy which basically consists of a rare-earth element, a transition metal, and boron is melted and cast, a casted ingot is covered with a carbon steel for machine construction which is a general soft magnetic material, and then it is subject to hot processing at 500 deg.C or more. After that, heat treating is performed at 250 deg.C or more and the produced rare-earth magnet is drilled and a metal axis 205 is entered. Then, the soft magnetic material covering the casted ingot is cut and used in reference to this metal axis 205. The permanent magnet 201 is used by providing an 8-pole multiple-pole magnetization on the periphery with a magnetizing yoke. In this rare-earth magnet, the peak value reaches 950 Gausses and a required magnetic force can be obtained. Thus, magnetic pole position, magnetic force strength, and magnetic pole width can be obtained easily.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a cylindrical multipolar magnet structure, and more particularly to a magnetic roll for a copying machine having four or more magnetic poles on a circumferential surface. The present invention relates to a cylindrical multipolar magnet structure used for.

[Prior Art] A conventional cylindrical multi-pole magnet structure has a cylindrical or rod-shaped permanent magnet arranged inside a cylindrical cover made of non-magnetic metal such as aluminum or stainless steel, and has four or more poles on the circumferential surface. As shown in the cross-sectional view of FIG.
It has a structure covered with 02.

The permanent magnet 201 is a permanent magnet generally called a ferrite plastic magnet, and is magnetized so that the required magnetic poles are distributed according to the required specifications.

However, ferrite plastic mags generally have low magnetic properties, and there is a limit to the ability to adjust the strength of the magnetic force that can be extracted during magnetization.

Therefore, as shown in the cross-sectional view of FIG. 4, an anisotropic permanent magnet 203 of an irregular shape that can extract strong magnetic force in a specific direction is placed inside the non-magnetic metal cylindrical cover 202 by a magnet support 204, and a predetermined magnetic pole is set in a predetermined position. Some were used to obtain strength.

[Problems to be Solved by the Invention] However, in these conventional techniques, there is a limit in extracting the necessary amount of magnetic force with a single permanent magnet, and it is difficult to use a combination of irregularly shaped anisotropic permanent magnets. This was a problem because it required a large number of permanent magnets to be assembled, which was complicated and required additional assembly costs.

The present invention solves the problems of the prior art described above, and its purpose is to easily and inexpensively adjust the magnetic pole position, magnetic strength, magnetic pole width, etc., including the production of odd number of poles. The object of the present invention is to provide a cylindrical multipolar magnet structure obtained.

[Means for Solving the Problems] The cylindrical multipolar magnet structure having four or more circumferential magnetic poles of the present invention is based on rare earth elements (including yttrium), transition metals, and boron as magnets. Melting and casting the alloy as a component, then covering the cast ingot with a material used in conjunction with a soft magnetic material or magnet, or melting an alloy consisting of at least the above basic components and using it in conjunction with a soft magnetic material or magnet. The material is cast into a mold made of a material, and then the material used is bonded to a soft magnetic material or magnet that covers the cast ingot, or the entire mold is hot worked at a temperature of 500°C or higher, and then heat treated at a temperature of 250°C or higher. It is characterized by the use of manufactured rare earth magnets.

[Example] Embodiments of the present invention will be described below based on the drawings.

[Example 1] In the cross-sectional view of FIG.
Consists of 5.

The permanent magnet 201 is made by melting and casting an alloy whose basic components are rare earth elements (including yttrium), transition metals, and boron, and then covering the cast ingot with carbon steel for mechanical structures, which is a general soft magnetic material. A rare earth magnet manufactured by hot working at a temperature of 500° C. or higher and then heat treatment at a temperature of 250° C. or higher is machined, a metal shaft 205 is inserted, and the metal shaft 205 is used as a reference for casting. The soft magnetic material covering the ingot was scraped off.

The permanent magnet 201 was used by being magnetized with eight poles on its circumference by a magnetizing yoke.

The permanent magnet 201 was rotated from above the non-magnetic metal cylindrical cover 202 using a commercially available Gauss meter and a Hall probe, and the magnetic force that could be taken out to the surface was measured.

According to the results, the peak value of the cylindrical multipolar magnet structure using ferrite plastic magnets according to the prior art was 650 Gauss, but the peak value of the cylindrical multipolar magnet structure using the rare earth magnet of the present invention was 650 Gauss. It was 950 gauss and was able to extract the necessary magnetic force.

[Example 2] In the cross-sectional view of FIG. 2, the cylindrical multipolar magnet structure includes a permanent magnet 201, a non-magnetic metal cylindrical cover 202, and a metal shaft 20.
Consists of 5 etc.

The permanent magnet 201 is made of a non-magnetic material that is used by melting an alloy consisting of at least the basic components of a rare earth element (including yttrium), a transition metal, and boron, and bonding it to the magnet. A rare earth magnet was used, which was produced by casting in a mold, then hot working the cast ingot together with the mold at a temperature of 500°C or higher, and then heat-treating the ingot at a temperature of 7°C or higher.

A hole is drilled in the soft magnetic material at the center of the rare earth magnet manufactured in this way, and a metal shaft 205 is driven into it, and the outer periphery is cut so as to leave the rest of the mold material 206 made of non-magnetic material in the required area. Machined.

Multi-pole magnetization was carried out using a magnetizing yoke so that five magnetic poles having an irregularly-shaped distribution could be extracted from the surface of the cylindrical multi-polar magnet structure produced as described above, and using a commercially available Gauss meter and Hall probe. The measurements showed that the magnetic poles had the required amount of magnetic force distributed in the required positions, and satisfied the required specifications.

[Effects of the Invention] As described above, in the cylindrical multipolar magnet structure of the present invention having four or more circumferential magnetic poles, the permanent magnet contains rare earth elements (including yttrium), transition metals, melting and casting an alloy whose basic components are boron and then covering the cast ingot with a soft magnetic material or a material to be used in conjunction with a magnet, or by melting an alloy consisting of at least the above-mentioned basic components, A soft magnetic material that is cast in a mold made of a material that is used in conjunction with a magnet, and then covered with a cast ingot, or a material that is used in conjunction with a magnet, or
The entire mold is hot-worked at over 500℃, and the i&25
By using rare earth magnets manufactured through heat treatment at temperatures above 0°C, the magnetic pole position, including the production of odd number poles,
This brings about the effect that magnetic force strength, magnetic pole width, etc. can be easily and inexpensively obtained.

[Brief explanation of the drawing]

FIGS. 1 and 2 are cross-sectional views showing embodiments of the present invention. FIGS. 3 and 4 are sectional views showing conventional examples. 201... Permanent magnet 202... Non-magnetic metal cylindrical cover 203... Irregular permanent magnet 204... Magnet support 205... Metal shaft 206.
・One or more remaining mold materials - Fig. 2 Fig. 4

Claims (2)

[Claims] (1) In a cylindrical multipolar magnet structure having four or more magnetic poles circumferentially, as the permanent magnet, an alloy containing a rare earth element (including yttrium), a transition metal, and boron as basic components is melted, The cast ingot is then covered with a soft magnetic material or a material used for bonding with a magnet.
A cylindrical multipolar magnet structure characterized by using a rare earth magnet produced by hot working at a temperature of 00°C or higher and then heat treatment at a temperature of 250°C or higher. (2) In a cylindrical multipolar magnet structure having four or more magnetic poles circumferentially, the permanent magnet is at least one of a permanent magnet whose basic components are a rare earth element (including yttrium), a transition metal, and boron. The alloy consisting of the above basic components is melted and cast into a mold made of a soft magnetic material or a material used for bonding with a magnet, and the cast ingot is then hot worked at 500°C or higher together with the mold, and then heated at 250°C. A cylindrical multipolar magnet structure characterized by using a rare earth magnet produced by heat treatment at a temperature above.