Process and apparatus for manufacturing an abrasive wire

Patent metadata

Field	Value
Publication number	US-9610642-B2
Application number	US-201314390292-A
Country	US
Kind code	B2
Filing date	Mar 29, 2013
Priority date	Apr 2, 2012
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

A process for manufacturing an abrasive wire formed by abrasive particles held on a central core by a binder comprises depositing abrasive particles on the central core, each particle comprising a magnetic material that has a relative permeability greater than 50 and that represents at least 1% of the volume of the abrasive particle, and depositing binder on the central core to keep the abrasive particles attached to it. The core has south poles and north poles alternating along either its circumference or its length.

First claim

Having described the invention, and a preferred embodiment thereof, what is claimed as new, and secured by Letters Patent is:

1. A process for manufacturing an abrasive wire formed by abrasive particles that are kept on a central core by a binder, said process comprising providing a central core, depositing magnetic abrasive particles on said central core, and depositing a binder on said central core, wherein said central core comprises a surface, wherein north poles and south poles are disposed on said surface, wherein said north poles and south poles are distributed in alternation along at least one of a circumference of said central core and a length of said central core, wherein, as a result of said distribution, a south pole is adjacent to two north poles, wherein, as a result of said distribution, a north pole is adjacent to two south poles, wherein each magnetic abrasive particle comprises a magnetic material, wherein said magnetic material has a relative permeability that is greater than 50, wherein said magnetic material represents at least 1% of a volume of said magnetic abrasive particle, wherein depositing said magnetic abrasive particles creates a magnetic interaction between said central core and said abrasive particles, wherein said magnetic interaction attracts said abrasive particles to said central core, and wherein depositing said binder on said central core results in keeping said abrasive particles attached to said central core.

2. The process of claim 1 , wherein providing a central core comprises providing a central core that has, at each south pole and at each north pole on said surface thereof, a permanent magnetic induction that is greater than 0.1 mT, wherein said permanent magnetic induction is directed in a radial direction of said central core.

3. The process of claim 1 , wherein providing a central core comprises providing a central core that has, at each south pole and at each north pole on said surface thereof, a permanent magnetic induction that is greater than 0.4 mT, wherein said permanent magnetic induction is directed in a radial direction of said central core.

4. The process of claim 1 , wherein providing a central core comprises providing a central core that has a permanent magnetic induction of at least 1 mT parallel, wherein said magnetic induction has a direction that is within ±10° of a longitudinal direction of said central core.

5. The process of claim 3 , further comprising, before providing said central core, applying a first external magnetic field to magnetize said central core, and applying a second external magnetic field to magnetize said central core, wherein said central core, as a result of having been magnetized by said first external magnetic field, has a first magnetic moment aligned with a longitudinal direction of said central core, and wherein, as a result of having been magnetized by said second external magnetic field, said central core has a second magnetic moment that is parallel to said first magnetic moment and directed in a direction opposite that of said first magnetic moment.

6. The process of claim 1 , wherein depositing magnetic abrasive particles on said central core, and depositing a binder on said central core are carried out at least twice.

7. The process of claim 1 , wherein depositing a binder on said central core comprises moving said central core in a longitudinal direction thereof inside an electrolyte bath, wherein said electrolyte bath comprises ions of said binder; and applying an electric potential difference between said moving central core and a working electrode to cause deposition by electrolysis of said binder on said central core.

8. The process of claim 1 , wherein depositing a binder on said central core comprises depositing said binder on said central core by electrolysis.

9. An apparatus for manufacturing abrasive wire formed by abrasive particles that are held on a central core by a binder, said apparatus comprising a particle-deposition unit, a binder-deposition unit, and a magnetizing device, wherein said particle-deposition unit is configured for depositing magnetic abrasive particles on said central core, wherein each magnetic abrasive particle comprises magnetic material, wherein each magnetic abrasive particle has a relative permeability that is greater than 50, wherein said magnetic material represents at least 1% of a volume of said magnetic abrasive particle, wherein said binder-deposition unit is configured for depositing said binder on said central core to keep said abrasive particles attached to said central core, wherein said magnetizing device is configured to magnetize said central core such that, prior to entry into said particle-deposition unit for deposition of abrasive particles thereon, said central core has north poles and south poles distributed in alternation along a surface thereof in a direction selected from the group consisting of a circumferential direction of said core and a longitudinal direction of said core, wherein said north poles and said south poles attract said magnetic abrasive particles to said central core during deposition of said magnetic abrasive particles on said central core.

10. A manufacture comprising an abrasive wire, wherein said abrasive wire comprises a central core and magnetic abrasive particles, wherein said magnetic abrasive particles are held on said central core by a binder, wherein said central core comprises north poles and south poles disposed on said surface, wherein said north poles and said south poles are distributed in alternation along at least one of a circumference of said central core and a length of said central core.

11. The manufacture of claim 10 , wherein said central core has a remanent magnetization greater than 5 mT.

12. The manufacture of claim 10 , wherein said magnetic abrasive particles comprise oblong particles, each of which has a major axis and a minor axis, wherein for at least 80% of said oblong particles, an angle between said major axis and a line normal to said surface of said central core that passes through said oblong particle is between 0° and 70°.

13. The manufacture of claim 10 , wherein for at least 85% of said magnetic abrasive particles, a shortest distance between said magnetic abrasive particle and said surface of said central core is within ±1 μm of a constant value.

Assignees

• Commissariat L Energie Atomique Et Aux Energies Alternatives
• Thermocompact Sa
• Centre Nat Rech Scient

Inventors

• Sanchez Gérald
• Ly Michel
• Rivoirard Sophie
• Griffond Arnaud

Classifications

• C23C18/1628 Primary

  Specific elements or parts of the apparatus · CPC title

• B23D61/185 Primary

  Saw wires; Saw cables; Twisted saw strips · CPC title

• C25D7/0607

  Wires · CPC title

• B24D18/0072

  using adhesives for bonding abrasive particles or grinding elements to a support, e.g. by gluing · CPC title

• B24D18/0018

  by electrolytic deposition · CPC title