US5591320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for obtaining well defined edge radii on cutting tool inserts by electropolishing technique
Assignee: Sandvik Intellectual Property AB
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Filing: 1995-12-04
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Granted: 1997-01-07
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Expires: 2015-12-04
Abstract
Abstract There is disclosed a method for edge rounding of cutting tool inserts of cemented carbide or titanium based carbonitride alloys. An electrolytic method is used with an electrolyte which provides an even removal of both binder phase and hard constituent phases. The electrolyte comprises perchloric (HC10 4 ) sulphuric (H 2 SO 4 ) acid, 2-15 vol %, and mixtures thereof in methanol or other suitable organic liquid. The method is easier to control than conventional mechanical methods and is particularly useful for providing very small edge radii of about 10 μm which cannot be made by mechanical methods.
Inventors
- 👤 Ulf Rolander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:37
CPC Classifications
C; C25; C25F; C25F3/00; C25F3/02; C25F3/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
99 words
An electropolishing method for edge rounding of cutting tool inserts of cemented carbide or titanium based carbonitride alloys in an electrolyte comprising 2-15 volume % of an acid selected from the group consisting of perchloric (HC10 4 ) acid, sulphuric (H 2 SO 4 ) acid and mixtures thereof, in an organic liquid carrier comprising; submerging said inserts into the electrolyte; providing an electrode of an acid resistant material within the electrolyte; applying an electrical potential between the inserts and the electrode for a period of time sufficient to round the edges of said inserts to a desired degree.
Claim 2
Dependent Claim
99 words
An electropolishing method for edge rounding of cutting tool inserts of cemented carbide or titanium based carbonitride alloys in an electrolyte comprising 2-15 volume % of an acid selected from the group consisting of perchloric (HC10 4 ) acid, sulphuric (H 2 SO 4 ) acid and mixtures thereof, in an organic liquid carrier comprising; submerging said inserts into the electrolyte; providing an electrode of an acid resistant material within the electrolyte; applying an electrical potential between the inserts and the electrode for a period of time sufficient to round the edges of said inserts to a desired degree.
Claim 3
Dependent Claim
15 words
The method of claim 1, wherein all edge rounding of about 10 μm is obtained.
Claim 4
Dependent Claim
14 words
The method of claim 1, wherein the organic liquid carrier is a lower alkanol.
Claim 5
Dependent Claim
12 words
The method of claim 3, wherein the organic liquid carrier is methanol.
Claim 6
Dependent Claim
12 words
The method of claim 1, wherein the electrode is made of platinum.
Claim 7
Dependent Claim
19 words
The method of claim 1, wherein the electrical potential is applied at a voltage of 10 to 40 volts.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-01-07 | 2000-07-08 | 2001-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-01-07 | 2004-07-08 | 2005-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-01-07 | 2008-07-08 | 2009-01-07 | $7700.00 | Window Closed / Lapsed |