Canadian Patents Database / Patent 2676851 Summary

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(12) Patent: (11) CA 2676851
(54) English Title: ELECTRO-EROSION EDGE HONING OF CUTTING TOOLS
(54) French Title: RODAGE D'ARETE COUPANTE D'OUTILS DE COUPE PAR ELECTRO-EROSION
(51) International Patent Classification (IPC):
  • B24B 3/36 (2006.01)
  • B23H 9/08 (2006.01)
  • B24B 1/00 (2006.01)
(72) Inventors (Country):
  • KOSHY, PHILIP (Canada)
(73) Owners (Country):
  • MCMASTER UNIVERSITY (Canada)
(71) Applicants (Country):
  • MCMASTER UNIVERSITY (Canada)
(74) Agent: VALADARES LAW PROFESSIONAL CORPORATION
(45) Issued: 2013-12-10
(22) Filed Date: 2009-08-27
(41) Open to Public Inspection: 2011-02-27
Examination requested: 2013-08-02
(30) Availability of licence: N/A
(30) Language of filing: English

English Abstract

A process for preparing the cutting edge of a cutting tool having a rake face and a clearance face. The process comprises the elimination of material from the cutting edge by providing a series of rapidly recurring electrical spark discharges in a gap located between the tool edge and a counterface. The spark discharges vaporize and melt the tool edge to form a desired radius.


French Abstract

Processus de préparation de l'arête coupante d'un outil de coupe doté d'une face de coupe et d'une face de dépouille. Le processus comprend l'élimination du matériau de l'arête coupante par l'application d'une série de décharges d'allumage récurrentes et rapides dans un écart situé entre l'arête de l'outil et une surface de contact. Les décharges d'allumage vaporisent et font fondre l'arête de l'outil pour former un rayon voulu.


Note: Claims are shown in the official language in which they were submitted.

What is claimed:
said tool comprising a rake face, and a clearance face with said cutting edge
at
least partially disposed therebetween, the process comprising:
a. arranging said cutting edge to be spaced apart by a gap from a counterface,

said counterface having a flat, planar surface;
b. providing a plurality of recurring electrical discharges in said gap, said
discharges resulting in the elimination of material from said cutting edge
and said counterface surface;
c. removing said material from said cutting edge and said counterface; and
d. forming said honed edge on said cutting edge,
wherein the counterface surface geometry changes after the providing step.
approximately 100 µm wide.
vice versa to maintain said gap range.
4. The process of Claim 1, wherein said formed edge has a radius ranging
from 2
1.1m to a pre-determined threshold.
5. The process of Claim 1, wherein said removing step further comprises
flushing said material with a gaseous or liquid dielectric fluid.
6. The process of Claim 1, wherein said electrical discharges are provided
in a
bath of dielectric fluid comprising abrasive or metallic particle additives.

7. The process of Claim 1, wherein said material removal is enhanced by an
electrolyte.
8. The process of Claim 1, wherein said tool has an axis that is oriented
perpendicular to said counterface for symmetric edge preparation.
9. The process of Claim 1, wherein said cutting tool is obliquely oriented
relative
to said counterface for asymmetric edge preparation.
10. The process of Claim 1, wherein said providing step further includes
moving
said cutting tool relative to said counterface in two or more dimensions.
11. The process of Claim 1, wherein said providing step further includes
moving
said counterface relative to said cutting tool in two or more dimensions.
12. The process of Claim 1, wherein said counterface is a metallic or
electrical
conducting material.
13. The process of Claim 12, wherein said counterface is selected from the
group
consisting of aluminium, copper, and steel.
14. The process of Claim 1, further comprising measuring the amount of
material
eliminated from said cutting edge and said counterface surface to calculate a
wear ratio after the removing step.
15. A process for honing a cutting edge of a tool comprising an ultra-hard
material, the process comprising:
a. arranging said tool disposed relative to a counterface, said counterface
having a flat, planar surface;
11

b. providing a plurality of electrical discharges between the length of the
cutting edge and the counterface surface;
c. eliminating and removing material from both the cutting edge and the
counterface surface by melting or vaporization; and
d. honing an edge along the length of the cutting edge,
wherein the counterface surface geometry changes after the providing step.
16. The process of Claim 15, wherein said ultra-hard material is selected
from the
group consisting of high speed steel, carbide, polycrystalline diamond, and
polycrystalline cubic boron nitride.
17. The process of claim 15 wherein steps b and c are repeated until said
edge is
honed to a desired edge radius.
18. A process for honing the cutting edge of a tool in an electro-discharge

machine, said cutting edge having a length, by eliminating material from the
cutting edge length and a planar electrode disposed relative to the cutting
edge
length with a plurality of controlled, electrical discharges provided
therebetween, removing and measuring the eliminated material, and
determining the radius formed along at least part of the cutting edge length.
12


A single figure which represents the drawing illustrating the invention.

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Admin Status

Title Date
(22) Filed 2009-08-27
(41) Open to Public Inspection 2011-02-27
Examination Requested 2013-08-02
(45) Issued 2013-12-10

Maintenance Fee

Description Date Amount
Last Payment 2017-08-28 $200.00
Next Payment if small entity fee 2018-08-27 $100.00
Next Payment if standard fee 2018-08-27 $200.00

Note : If the full payment has not been received on or before the date indicated, a further fee may be required which may be one of the following

  • the reinstatement fee set out in Item 7 of Schedule II of the Patent Rules;
  • the late payment fee set out in Item 22.1 of Schedule II of the Patent Rules; or
  • the additional fee for late payment set out in Items 31 and 32 of Schedule II of the Patent Rules.

Payment History

Fee Type Anniversary Year Due Date Amount Paid Paid Date
Filing $400.00 2009-08-27
Registration of Documents $100.00 2009-12-14
Maintenance Fee - Application - New Act 2 2011-08-29 $100.00 2011-08-18
Maintenance Fee - Application - New Act 3 2012-08-27 $100.00 2012-08-23
Maintenance Fee - Application - New Act 4 2013-08-27 $100.00 2013-08-01
Request for Examination $800.00 2013-08-02
Final $300.00 2013-10-02
Maintenance Fee - Patent - New Act 5 2014-08-27 $200.00 2014-07-23
Maintenance Fee - Patent - New Act 6 2015-08-27 $400.00 2015-09-01
Maintenance Fee - Patent - New Act 7 2016-08-29 $200.00 2016-08-26
Maintenance Fee - Patent - New Act 8 2017-08-28 $200.00 2017-08-28
Back Payment of Fees $400.00 2017-08-30

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Document
Description
Date
(yyyy-mm-dd)
Number of pages Size of Image (KB)
Cover Page 2011-02-15 1 32
Abstract 2009-08-27 1 10
Description 2009-08-27 9 390
Claims 2009-08-27 2 48
Drawings 2009-08-27 5 66
Representative Drawing 2011-02-01 1 7
Claims 2013-08-02 3 80
Cover Page 2013-11-14 1 32
Fees 2011-08-18 1 203
Correspondence 2010-01-25 1 15
Prosecution-Amendment 2013-08-02 10 295
Prosecution-Amendment 2013-08-30 1 21
Correspondence 2013-10-02 1 38
Fees 2015-09-01 1 28
Fees 2016-08-26 1 33
Fees 2017-08-28 1 31
Correspondence 2017-09-06 1 28