US4272927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a broaching tool
Assignee: Acme Precision Products Inc
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Filing: 1979-12-10
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Granted: 1981-06-16
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Expires: 1999-12-10
Abstract
Abstract A broaching tool is manufactured directly from a heat hardened blank of preformed metal by having a grinding wheel of CBN (cubic boron nitride) material cut a broach tooth from the hardened blank by cutting gullets in the blank. The blank is made movable and rotatable relative to the CBN grinding wheel to allow the manufacture of a series of broach teeth forming a broaching tool with various tooth spacings, depths, and angles with respect to the face of the broaching tool.
Inventors
- 👤 Julius D. Myers
- 👤 John X. Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:52
CPC Classifications
B; B23; B23P; B23P15/00; B23P15/28; B23P15/42; B24; B24B; B24B1/00; B24B3/00; B24B3/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
156 words
A method of manufacturing a broaching tool comprising the steps of: providing a blank piece of steel material suitable for manufacturing a broaching tool; heat treating said steel material to harden it to a Rockwell C hardness substantially in the range of 63.5 to 67 thereby; grinding a series of gullets directly into the hardened material with a CBN 500 (cubic boron nitride) grinding wheel to form a series of finished broach cutting teeth therein with said grinding with said CBN 500 grinding wheel being done so as to provide the removal of between 0.06 and 0.09 inches of hardened metal per each cyclic pass of said CBN 500 grinding wheel across the surface of said hardened material at a rate of approximately 2 to 6 inches per minute; and exhausting a synthetic coolant on the face of said CBN 500 grinding wheel at a rate of substantially 30 gallons per minute during the grinding operation.
Claim 2
Independent Claim
156 words
A method of manufacturing a broaching tool comprising the steps of: providing a blank piece of steel material suitable for manufacturing a broaching tool; heat treating said steel material to harden it to a Rockwell C hardness substantially in the range of 63.5 to 67 thereby; grinding a series of gullets directly into the hardened material with a CBN 500 (cubic boron nitride) grinding wheel to form a series of finished broach cutting teeth therein with said grinding with said CBN 500 grinding wheel being done so as to provide the removal of between 0.06 and 0.09 inches of hardened metal per each cyclic pass of said CBN 500 grinding wheel across the surface of said hardened material at a rate of approximately 2 to 6 inches per minute; and exhausting a synthetic coolant on the face of said CBN 500 grinding wheel at a rate of substantially 30 gallons per minute during the grinding operation.
Claim 3
Dependent Claim
29 words
A method of manufacturing as set forth in claim 1 wherein said grinding wheel is rotated at approximately 11,500 surface feet per minute at the periphery of the wheel.
Claim 4
Dependent Claim
35 words
A method of manufacturing as set forth in claim 2 wherein said blank piece of metal material is steel and wherein a taper is cut into the blank steel material before it is heat treated.
References Cited (Backward Citations)
US2163687A
Cited
US2536864A
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US2889669A
Cited
US3461748A
Cited
US3553909A
Cited
US3984213A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-15 | 1984-12-15 | 1985-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-15 | 1988-12-15 | 1989-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-15 | 1992-12-15 | 1993-06-16 | $7700.00 | Window Closed / Lapsed |