Magnetic shape optimization

Patent metadata

Field	Value
Publication number	US-9312066-B2
Application number	US-201213604606-A
Country	US
Kind code	B2
Filing date	Sep 5, 2012
Priority date	Jan 9, 2012
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

A method for efficiently machining magnets with curved surfaces is disclosed. The use of machining equipment capable of making curved cuts through magnetic material can allow significant cost and material savings, particularly when machining magnets with complementary surfaces. A process for using a series of cutting wires to simultaneously cut magnetic material into conformally shaped magnets is described.

First claim

What is claimed is:

1. A method of cutting a magnetic substrate, the method comprising:
moving a workpiece holder in at least two axes to maneuver the magnetic substrate coupled thereto through a number of cutting wires to form at least two magnets having complementary curved surfaces;
maintaining a minimum clearance distance between at least two anti-parallel sets of the cutting wires;
adjusting a pitch value between parallel cutting wires in accordance with one dimension of the magnets; and
removing the magnetic substrate from the wire cutting machine in a single operation after a series of cutting operations,
wherein the magnetic substrate is held together in a single block by a coating selected from the group consisting of wax and epoxy.

2. The method as recited in claim 1 , comprising:
adjusting a wire path of the cutting wires in accordance with a curvature value desired for the complementary curved surface.

3. The method of claim 1 , wherein the wherein the number of cutting wires is fixed in place and the workpiece holder is configured to maneuver the workpiece in both an X axis and a Z axis with respect to the plurality of cutting wires.

4. The method of claim 1 , wherein the number of cutting wires is movable with respect to the workpiece and the workpiece holder is fixed in place.

5. The method of claim 1 , wherein two of the at least two sets of cutting wires are orthogonally aligned.

6. The method of claim 5 , wherein each of the number of cutting wires in each of the cutting wire sets has a corresponding slot in the workpiece holder arranged to receive it.

7. The method of claim 1 , wherein the magnetic substrate is a demagnetized rare earth magnet.

8. The method of claim 1 , further comprising, immersing the portions of the number of wires that are in close proximity to the magnetic substrate in a working fluid when moving the magnetic substrate through the number of cutting wires.

9. The method of claim 1 , wherein the number of cutting wires are wire saw cutting wires.

10. The method of claim 1 , wherein the number of cutting wires are electrical discharge machining (EDM) cutting wires.

11. The method of claim 1 , wherein the magnetic substrate is coupled to the workpiece by vacuum suction.

Assignees

• Lancaster-Larocque Simon Regis Louis
• Satcher Ryan M
• Apple Inc

Inventors

• Lancaster-Larocque Simon Regis Louis
• Satcher Ryan M

Classifications

• Y10T29/49789

  Obtaining plural product pieces from unitary workpiece · CPC title

• B28D1/02

  by sawing · CPC title

• H01F41/0253 Primary

  for manufacturing permanent magnets · CPC title

• B28D1/041

  with cylinder saws, e.g. trepanning; saw cylinders, e.g. having their cutting rim equipped with abrasive particles · CPC title

• B23H1/00

  Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric · CPC title