CN100382206C

CN100382206C - Method for finely finishing easy-to-smash and easy-to-rust rare-earth like composite magnet

Info

Publication number: CN100382206C
Application number: CNB2005100266580A
Authority: CN
Inventors: 章祥根; 赵佑民; 杜时骏
Original assignee: Shanghai Epson Magnetics Co Ltd
Current assignee: SHANGHAI SAN HUAN MAGNETICS CO., LTD.
Priority date: 2005-06-10
Filing date: 2005-06-10
Publication date: 2008-04-16
Anticipated expiration: 2025-06-10
Also published as: CN1710674A

Abstract

The present invention discloses a method for finishing a composite magnet (a binding nd-fe-b magnet, binding neodymium ferrum nitrogen, binding samarium cobalt and binding magnets containing rare earth elements) which can be easily broken and rusted and is in the rare earth class. Finished workpieces, media, finishing material and auxiliary agents are placed into a closed container, and are rotated or / and swung or / and vibrated in the atmosphere and under a vacuum condition or in a noble gas atmosphere. The media, the finishing material, the finished workpieces and the auxiliary agents have different densities. Thus, when the media, the finishing material, the finished workpieces and the auxiliary agents are rotated or / swung or / and vibrated in the container, the finished workpieces are rubbed, flushed and impacted to be finished by the finishing material, the media and the auxiliary agents which move in multiple directions. The finished workpieces are chamfered, burs are removed, and the surfaces obtain the specified smoothness. The workpieces are finished in the media, and thus, the media and the finishing material decelerate the movement of the workpieces and the impacted dynamic energy in order to prevent the workpieces from being broken. The media have anti-rust elements, and thus, the conditions rusting the workpieces are reduced. The purposes of finishing the workpieces and preventing the workpieces from being broken and rusted are obtained.

Description

A kind of finely finishing method of easy-to-smash and easy-to-rust rare-earth like composite magnet

Technical field

The present invention relates to the finely finishing method of composite RE body.

Technical background

The terres rares built-up magnet, comprise Agglutinate neodymium-iron-boron magnet, bonding neodymium iron nitrogen, bonding SmCo and every bonded permanent magnet that contains rare earth element, for example: 1. 3.5 inches to 0.3 inch large-scale and miniature hard disk drive bonding rare earth magnet in (one) IT industry, 2. CD-ROM, ODD, CD, bonding rare earth magnet among the DV, 3. digital product, digital gamma camera, digital camera, MP3, PDA, bonding rare earth magnet among the GPS, 4. buzzer, bonding rare earth magnet in the loud speaker, 5. photocopier, printer, scanner, bonding rare earth magnet in the color laser imaging machine etc.; (2) the 1. bonding rare earth magnet in the mobile phone in the communications industry, the bonding rare earth magnet in 2. related transmission, control and the buzzing system with communication; (3) bonding rare earth magnet in the 1. various electric motor of automobile in the automobile, the bonding rare earth magnet in the 2. various automobile sensors, 3. related transmission and the bonding rare earth magnet in the control system with automobile; (4) bonding rare earth magnet in electronic product, electrical equipment, the motor, processing request is very high, need accurate dimensions control, material brittle is easily become rusty, the finishing of this magnet, the method of handling as the fineness on chamfering, flash removed, surface will directly influence the quality and the productive rate of product, also be the problem that this area is extremely paid close attention to.

At present conventional method adopts the oscillatory type light screen(ing) machine of up-down vibration, the centrifugal smooth screen(ing) machine that high speed scroll grinds, and the sand machine of penetrating of abrasive blasting in the air, the galvanic corrosion processing machine, polishing machines etc. carry out finishing, the percentage of damage height, easily get rusty.

Summary of the invention

The technical issues that need to address of the present invention are the finely finishing methods that disclose a kind of easy-to-smash and easy-to-rust rare-earth like composite magnet, to overcome the above-mentioned defective that prior art exists.

Method of the present invention comprises the steps:

To be placed closed container by finishing workpiece, medium, finishing material and auxiliary agent, in atmosphere, vacuum degree is under the condition of 0.01～0.1Mpa or in atmosphere of inert gases, rotate or/and swing or/and vibrations, the rotating speed that container rotates is 1～200 rev/min, and the frequency of container vibration is 0～100 time/minute; The angle of container swing is 0 °～90 °;

Processing time is 10～60 minutes, can adjust according to result;

When adopting inert gas, the operating pressure in the container is 0.01～0.1Mpa;

Said inert gas is selected nitrogen, argon gas for use;

Said medium choosing contains the water of auxiliary agent, and loading is 0.5%～80% of a container volume;

Said auxiliary agent comprises rust inhibitor and degreasing agent, and promoter addition is 0%～8% of a medium-weight;

Preferred rust inhibitor is the host unrighted acid, can adopt the SC600 of You Xilu company, the rust inhibitor of Shanghai Henkel P3 series;

Degreasing agent be for can adopt the 8C600 of You Xilu company, the degreasing agent of Shanghai Henkel P3;

Said finishing material is the solid particle with corner angle, and density is 0.8～8g/cm ³Particle diameter is 0.3～20mm, its shape comprises multiaspect rhombogen, multiaspect triangle body, square, ball or cuboid, its material is selected from inorganic salts, as silicate, as white fused alumina abrasive material, brown corundum abrasive silicon carbide abrasive, alumina abrasive, metal or its oxide, as iron oxide, foamed plastics, rubber, rigid plastics, the addition of finishing material is 0.5%～80% of a container inner volume;

By the addition of finishing workpiece is 0.001%～60% of container volume;

The operation principle of finishing of the present invention is such:

Owing to medium, finishing material, with auxiliary agent different density is arranged all by the finishing workpiece, therefore, when its in container, rotate or/and swing or/and during vibrations, by the finishing workpiece by finishing material, medium, the auxiliary agent friction of multi-direction motion, wash away, clash into and by finishing, chamfering, flash removed, surface reach the fineness of regulation, because finishing in medium, the movement velocity that medium, finishing material slow down workpiece, slow down the kinetic energy that is clashed into, prevent the workpiece fragmentation, antirust element is arranged in the medium, reduce the condition that workpiece is become rusty.Reach is that finishing prevents fragmentation again, prevents the purpose of getting rusty.

Embodiment

Embodiment 1

By the finishing workpiece is circular bonding rare earth magnet, Agglutinate neodymium-iron-boron magnet, the rare earth ferroalloy nitride, bonding SmCo and every bonded permanent magnet that contains rare earth element, for example: 1. 3.5 inches to 0.3 inch large-scale and miniature hard disk drive bonding rare earth magnet in (one) IT industry, 2. CD-ROM, ODD, CD, bonding rare earth magnet among the DV, 3. digital product, digital gamma camera, digital camera, MP3, PDA, bonding rare earth magnet among the GPS, 4. buzzer, bonding rare earth magnet in the loud speaker, 5. photocopier, printer, scanner, bonding rare earth magnet in the color laser imaging machine etc.; (2) the 1. bonding rare earth magnet in the mobile phone in the communications industry, the bonding rare earth magnet in 2. related transmission, control and the buzzing system with communication; (3) bonding rare earth magnet in the 1. various electric motor of automobile in the automobile, the bonding rare earth magnet in the 2. various automobile sensors, 3. related transmission and the bonding rare earth magnet in the control system with automobile; (4) the ZL patent No. bonding rare earth magnet in electronic product, electrical equipment, the motor): 96119267.4, the ZL patent No.: disclosed report has been arranged in 96121941.6 patents, and wall thickness is 1.0mm;

The finishing material adopts cuboid white fused alumina abrasive material and rubber, catercorner length is 5mm, finishing material addition is 15% of a container volume, medium is a water, addition is 30% of a container volume, auxiliary agent adopts the host unrighted acid, can adopt the SC600 of You Xilu company, the rust inhibitor of Shanghai Henkel P3 series, addition be water weight 5%, be 15% of container volume by the addition of finishing workpiece, in atmosphere,, container is rotated and swings by coupled mechanical device, 25 rev/mins of the rotating speeds of rotation; 75 ° of the angles of swing after work in 15 minutes, are taken out, by the finishing workpiece, and chamfering R0.2mm, the no burr in surface, the surface reaches 2.5 grades, meets the specification requirement of magnet client regulation.

Embodiment 2

By the finishing workpiece is circular bonding rare earth magnet, and its chemical constituent is in rare earth element, excessive property element (iron, cobalt), boron, nitrogen, the ZL patent No.: 96119267.4; The ZL patent No.: disclosed report has been arranged in 96121941.6 patents, and wall thickness is 0.2～0.4mm;

It is 1mm that the finishing material adopts multiaspect triangle white fused alumina abrasive material average grain diameter, its shape ball or cuboid, it is 10% of container volume that its material is selected from brown corundum abrasive, silicon carbide abrasive, finishing material addition, medium is a water, addition is 20% of a container volume, auxiliary agent is a degreasing agent, rust inhibitor: Japanese You Xilu SC600 of company or Shanghai Henkel P3 series host unrighted acid; Degreasing agent: the Japanese You Xilu of Shanghai Henkel S series company, addition be water weight 1～3%, be 5% of container volume by the addition of finishing workpiece;

Container is rotated, swings and vibrate by coupled mechanical device, 10 rev/mins of the rotating speeds of rotation; 10 ° of the angles of swing, the frequency of container vibration is 1 time/minute, after work in 40 minutes, takes out, by the finishing workpiece, chamfering R0.2mm, the no burr in surface, the surface reaches 2.5 grades, meets the specification requirement of magnet client regulation.

Claims

1. the finely finishing method of a frangible easy rust rare-earth bonded permanent magnet, it is characterized in that, comprise the steps: and to be placed closed container by finishing workpiece, medium, finishing material and auxiliary agent, in atmosphere, vacuum degree is under the condition of 0.01～0.1Mpa or in atmosphere of inert gases, rotate or/and swing or/and vibrations;

Said medium is selected from water or contains the aqueous solution of auxiliary agent, and loading is the 0.5%-80% of container volume;

Promoter addition is the 0%-8% of water weight;

Said finishing material be have corner angle or the spherical solid particle, density is 0.5～8g/cm ³, particle diameter is 0.3～20mm, the addition of finishing material is the 0..5%-80% of container volume;

By the addition of finishing workpiece is the 0.001%-60% of container volume.

2. method according to claim 1 is characterized in that, the rotating speed that container rotates is 1～200 rev/min.

3. method according to claim 2 is characterized in that, the frequency of container vibration is 0～100 time/minute.

4. method according to claim 3 is characterized in that, the angle of container swing is 0 °～90 °.

5. method according to claim 4 is characterized in that, the processing time is 10～60 minutes.

6. method according to claim 1 is characterized in that said inert gas is selected nitrogen or argon gas for use, and the operating pressure in the container is 0.01～0.1Mpa.

7. method according to claim 1 is characterized in that said auxiliary agent comprises rust inhibitor or degreasing agent.

8. method according to claim 1, it is characterized in that, said finishing material shape comprises multiaspect rhombogen, multiaspect triangle body, square, ball or cuboid, and its material is selected from inorganic salts, metal or its oxide, foamed plastics, rubber, rigid plastics.