US3816995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
End mill grinder
Assignee: OMARK WINSLOW AEROSPACE TOOL CO US
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Filing: 1972-06-29
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Granted: 1974-06-18
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Expires: 1992-06-29
Abstract
Abstract A production type machine is designed to grind end mills at a high rate while maintaining rigid standards of accuracy of dimension. Adjustments are quickly and easily made for different profiles of the ground face, the number of flutes on the mill, the size of the end mill, and so on. The machine will selectively grind either a curved cutter face, or an angular primarysecondary relief form thereon. Operation of the apparatus is fully automatic once the grind cycle is started, after necessary adjustments are made, as only the loading and unloading operations are manually performed.
Inventors
- 👤 E Borchert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:17
CPC Classifications
B; B24; B24B; B24B3/00; B24B3/02; B24B3/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
253 words
In a grinding machine for grinding end faces on an end mill, the combination of: a frame; a grinding wheel rotatably mounted on said frame; a workhead for holding the end mill with its longitudinal axis in predetermined relation to said grinding wheel; a workhead carriage movable on said frame to carry said workhead and end mill along a predetermined feed in path ending substantially normally to the grinding surface of said grinding wheel, so as to engage an end portion of said end mill with said grinding surface of said grinding wheel; means for imparting successive feed in movements to said workhead carriage to move said workhead along said path, a pivot mounting for said workhead on said carriage on an axis perpendicular to said path; adjustable stop means for limiting swing of said workhead about is pivot mounting on said carriage for establishing the longitudinal axis of said end mill at two preselected angular spaced end limit positions relative to said grinding surface; means for swinging the workhead to position it and thE end mill held thereby in one and then the other of said end limit positions in a timed sequence prior to successive feed in movements of the carriage along said predetermined path so that upon feed in movement at each position a predetermined different angular relief surface is formed on said end mill; and means for initiating feed in movements of the workhead carriage in response to arrival of the workhead at each said preselected end limit positions.
Claim 2
Dependent Claim
253 words
In a grinding machine for grinding end faces on an end mill, the combination of: a frame; a grinding wheel rotatably mounted on said frame; a workhead for holding the end mill with its longitudinal axis in predetermined relation to said grinding wheel; a workhead carriage movable on said frame to carry said workhead and end mill along a predetermined feed in path ending substantially normally to the grinding surface of said grinding wheel, so as to engage an end portion of said end mill with said grinding surface of said grinding wheel; means for imparting successive feed in movements to said workhead carriage to move said workhead along said path, a pivot mounting for said workhead on said carriage on an axis perpendicular to said path; adjustable stop means for limiting swing of said workhead about is pivot mounting on said carriage for establishing the longitudinal axis of said end mill at two preselected angular spaced end limit positions relative to said grinding surface; means for swinging the workhead to position it and thE end mill held thereby in one and then the other of said end limit positions in a timed sequence prior to successive feed in movements of the carriage along said predetermined path so that upon feed in movement at each position a predetermined different angular relief surface is formed on said end mill; and means for initiating feed in movements of the workhead carriage in response to arrival of the workhead at each said preselected end limit positions.
Claim 3
Dependent Claim
26 words
The subject matter of claim 1, including two manually and independently adjustable stops for setting said end limit positions of said workhead relative to said carriage.
Claim 4
Dependent Claim
52 words
The subject matter of claim 1, including a pivot mounting for said carriage on said frame, on an axis parallel to that of said workhead on said carriage, so arranged that said feed in path for said workhead is an arc approaching a grinding surface on said grinding wheel substantially normally thereto.
Claim 5
Dependent Claim
78 words
The grinding machine according to claim 3, wherein: the means for imparting feed in movements to the workhead carriage and the means for swinging the workhead each comprises a hydraulic cylinder and plunger assembly, and including means responsive to arrivals of the workhead at said end limit positions as moved thereto by one of said cylinder and plunger assemblies for activating the other of said cylinder and plunger assemblies to initiate feed in movements of the workhead carriage.
Claim 6
Dependent Claim
127 words
The grinding machine according to claim 2 in which one of said stops is adjustable to position the workhead and the end mill held therein such that feed in movement of said end mill against said grinding wheel at that position causes a primary relief surface to be ground on said ene mill at a predetermined angle with respect to the longitudinal axis of said end mill, and said other stop is adjustable to position said work head and the end mill held therein such that feed in movement of said end mill in that angular position causes a secondary relief surface to be formed on said end mill at predetermined angles with respect to said primary relief surface and the longitudinal axis of the end mill.
Claim 7
Dependent Claim
74 words
The grinding machine according to claim 1 in which said workhead includes at least one trunion mounted for relative rotational movement in said carriage, an arm member secured to said trunion for rotational movement with said trunion and workhead relative to said carriage, and a pair of stop members adjustably positionable in said carriage on opposite sides of said arm member for limiting rotational movement of said arm, trunion, and workhead between predetermined positions.
Claim 8
Dependent Claim
173 words
The grinding machine according to claim 3 in which said pivot mounting for said carriage includes a depending sleeve mounted for relative rotational movement within same frame, means for selectively imparting rotational movement to said sleeve in response to the arrival of said workhead at each of said preselected in limit positions, said workhead having at least one trunion mounted in said carriage for relative rotational movement, said means for swinging said workhead to said limits including a shaft extending coaxially through said depending sleeve, linkage means connecting one end of said shaft to said trunion whereby rotation of said shaft relative to said sleeve causes rotary movement of said trunion and workhead relative to said carriage, means for imparting rotary movement to said shaft in response to the arrival of said workhead at each of said preselected limit positions, and said stop means including a pair of threaded members adjustably mounted within said carriage for engagement by said linkage to limit rotational movement of said shaft and trunion between determined angular positions.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |