JP2001143931A - Method for magnetizing magnetic rubber ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for magnetizing a magnetic rubber ring for increasing a magnetic force, and for reducing the circumferential fluctuation of the magnetic force. SOLUTION: In this method for magnetizing a magnetic rubber ring, a cylindrical part 12 of a magnetic core metal 1 integrated with a 0.3 mm-1.5 mm thick magnetic rubber ring 2 is grip fixed to a circular ring 3 or a chuck 5 so that pressurization and separation for a magnetizing yoke 4 can be performed. Thus, a magnetic force can be increased, and the circumferential fluctuation of the magnetic force can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for magnetizing a magnetic rubber ring having a high magnetic force and a small circumferential magnetic variation.

[0002]

2. Description of the Related Art Conventionally, in producing a rubber ring having magnetism, an appropriate amount of magnetic powder is mixed with a rubber material to form a rubber material, and this rubber material is vulcanized and integrated into a mounting member also serving as reinforcement. In the magnetization, the magnetic rubber ring is placed concentrically at the center of the magnetized yoke, and the S and N poles are alternately arranged and magnetized by closely contacting the magnetic rubber ring. Work.

[0003]

However, such magnetic rubber rings are often formed to a thickness of about 2.0 mm to 3.0 mm in consideration of moldability and handleability. In magnetizing, it is difficult to bring the magnetic rubber ring and magnetized yoke into concentric and accurate surface contact.Some deviations or deviations may cause the magnetized yoke to become eccentric or inclined. It has the drawback that it causes variations in magnetism and cannot provide a magnetic rubber ring of stable quality.

In view of the above drawbacks, the present invention sets the molding thickness of the magnetic rubber ring and the reinforcing member to be relatively small in order to make the magnetic force characteristics of the magnetic rubber ring uniform in the circumferential direction.
It is an object of the present invention to provide a highly accurate magnetizing method for magnetizing a magnetic rubber ring using a crimping device.

[0005]

The present invention will be described with reference to the drawings. As shown in FIG. 1, a rubber material such as synthetic rubber and a magnetic powder such as ferrite are mixed into a magnetic core 1 made of a magnetic material. A method of magnetizing a vulcanized magnetic rubber ring 2, wherein the magnetic core 1 has a thickness of 0.3 mm to 1.5 mm, and has a radial portion 11 and a cylindrical portion 12. The radial portion 11 of the metal core 1 is provided with a thickness of 0.3 mm to 1.5 mm to form a magnetic rubber ring 2, and the circular ring 3 having an inner diameter to which the outer peripheral surface of the cylindrical portion 12 fits is used as the cylinder. After the portion 12 is mounted and fixed, the magnetized yoke 4 arranged concentrically with the ring 3 is pressed against the magnetic rubber ring 2 as shown in FIG. The inner circumference is spread by the chuck 5 and the magnetized yoke 4
Is separated from the magnetic rubber ring 2.

Further, as shown in FIG.
Surface pressure of the magnetic rubber ring 2 of 0.5 to 20
kg / cm2.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention proposes a magnetizing method for applying a magnetic force from a magnetizing yoke 4 to a magnetic rubber ring 2 formed as described above, and is integrated with the magnetic rubber ring 2. The cylindrical portion 12 of the magnetic cored bar 1 is gripped and fixed by the ring 3 or the chuck 5 to accurately press against the magnetized yoke 4 and release. At this time, the thickness of the magnetic core 1 is a relatively thin magnetic material of 0.3 mm to 1.5 mm,
A radial rubber part 2 having a thickness of 0.3 mm to 1.5 mm is formed integrally with the radial part 11 by forming a substantially L-shaped cross section having a radial part 11 and a cylindrical part 12. The cylindrical portion 12 is an appropriate portion to be gripped and fixed by the ring 3 or the chuck 5. With this configuration, the magnetic rubber ring 2 that has been magnetized exhibits an accurate and high magnetic force, and has less circumferential magnetic variation.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment of the present invention, in the magnetization, as shown in FIG. 1, the outer peripheral surface of a cylindrical portion 12 of a magnetic cored bar 1 is fitted and fixed in a ring 3 so as to be concentric with the ring 3. And the magnetized yoke 4 arranged concentrically with the ring 2 is moved onto the magnetic rubber ring 2 so as to be 0.5 to 20 kg.
/ Cm2 with a contact pressure. Here, the magnetized yoke 4 and the magnetic rubber ring 2 come into contact with each other, and a current flows through the magnetized yoke 4 in a state where the magnetized yoke 4 is pressed against the ring 3 through the cylindrical portion 12 made of a magnetic material on the back surface of the magnetic rubber ring 2. The magnetic rubber ring 2 is accurately magnetized by the generated magnetic force lines. Here, since the magnetic core 1 is made of a magnetic material and the magnetic rubber ring 2 is formed to have a thickness of 0.3 mm to 1.5 mm,
As shown in FIG. 2, a clear line of magnetic force flows due to energization, and a strong magnetic force is applied to the magnetic rubber ring 2. After the magnetization, the magnetic rubber ring 2 magnetically adhered to the magnetization yoke 4 is attached to the inner peripheral side of the cylindrical portion 12 with the chuck 5 spread, pulled out, and separated from each other.

The cylindrical portion 12 is formed as a press-fit portion with a member (not shown) for attachment to a shaft or the like, and is formed with high precision. If the magnetization and the take-out are performed, the accuracy of all parts other than the part is improved. The magnetized yoke 4 is required to be installed concentrically with the ring 3, but the magnetized yoke 4 is arranged so that its magnetized surface is smooth and exactly overlaps the surface of the magnetic rubber ring 2 in the axial direction. It is also important to press the magnetic rubber ring 2 with the magnetized yoke 4 at a surface pressure of 0.5 to 20 kg / cm 2. If the surface pressure is small, the inclination is increased. Conversely, if the surface pressure is large, the rubber is excessively deformed and the magnetization tends to vary.
Further, in the chuck 5 for gripping the magnetic core 1, the structure in which the three claws are expanded to grip the inner peripheral portion of the cylindrical portion 12 has a small eccentricity and enables simple and reliable attachment and detachment. If desired, for example, a multi-claw structure of four, five, six, etc. can be adopted.

[0010]

According to the present invention, in order to make the magnetic force characteristics of the magnetic rubber ring 2 uniform in the circumferential direction, the molding thickness of the magnetic rubber ring 2 and the thickness of the magnetic core 1 are set and the concentricity is maintained. The magnetic core 1 and the magnetic rubber ring 2 are both set to have a thickness of 0.3 mm to 1.5 mm by using a crimping device that is maintained, and the magnetization is reduced. After the magnetic lines of force pass through the magnetic rubber ring 2, they flow strongly through the magnetic core 1, and thus a strong magnetic force can be applied to the magnetic rubber ring 2.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a magnetized state of the present invention.

FIG. 2 is an enlarged sectional view showing a magnetized state of the present invention in an easily understandable manner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic core metal 2 Magnetic rubber ring 11 Radial part 12 Cylindrical part 3 Ring 4 Magnetization yoke 5 Chuck

Claims (2)

[Claims] 1. A method of magnetizing a magnetic rubber ring comprising a rubber material and a magnetic powder mixed with a reinforcing magnetic core made of a magnetic material and vulcanized and adhered thereto, wherein the magnetic core has a thickness of 0.1 mm. 3 mm to 1.
5 mm having a radial portion and a cylindrical portion, a magnetic rubber ring having a thickness of 0.3 mm to 1.5 mm is formed in the radial portion of the magnetic core, and an inner diameter on which the outer peripheral surface of the cylindrical portion fits After attaching and fixing the cylindrical portion to a magnetic material ring having dimensions,
The magnetized yoke arranged concentrically with the ring is pressed against the magnetic rubber ring to perform magnetization, and then the inner peripheral side of the cylindrical portion is spread by a chuck, and the magnetized yoke is magnetized by pulling-out movement. A method for magnetizing a magnetic rubber ring, characterized in that it is separated from the rubber ring. 2. The method for magnetizing a magnetic rubber ring according to claim 1, wherein a surface pressure of said magnetizing yoke against said magnetic rubber ring is 0.5 to 20 kg / cm 2.