US3583278A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of cutting bevel gears
Assignee: Gleason Works
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Filing: 1968-10-21
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Granted: 1971-06-08
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Expires: 1988-10-21
Abstract
Abstract The present invention comprises novel methods and techniques for the rough cutting of bevel gears, particularly spiral bevel or hypoid pinions, wherein there is contemplated a two-stage roughing operation to be followed by finishing operations. In the preliminary or first stage roughing operation, the tapered tooth slots will only be cut to partial depth, and not to the desired, final roughed depth, and the cutting action will comprise a relative plunge feed between tool and work followed by a cutting generating roll. This generating roll will be abbreviated or of a lesser amplitude than the generating roll that would be required to cut the roughed tooth slot by a generating action alone. In the second stage roughing operation, the tapered tooth slots preferably are roughed out to full or substantially full depth with a full generating roll, and with cutting action taking place on both the forward and return generating rolls, so as to more closely approximate the final, finished tooth shape whereby finishing operations may be facilitated. It is also contemplated that this two-stage roughing operation be performed with cutting going on simultaneously on two workpieces, one at each roughing station, and further be combined with a process utilizing means for automatically loading and unloading the work at the two roughing stations, with the workpieces being automatically transferred from the first to the second roughing station with automatic stock division taking place in that transfer, and with a feeding of the workpieces to a first region where they are to be moved to the first roughing station, and with a discharge region for receiving the final roughed workpieces from the second roughing station for ultimate transfer to a finishing operation.
Inventors
- 👤 Meriwether L Baxter Jr
- 👤 Edward Stark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:48
CPC Classifications
B; B23; B23F; B23F9/00; B23F9/08; B23F9/10; B23F23/00; B23F23/02; B23F23/04; Y; Y10; Y10T; Y10T409/00; Y10T409/10; Y10T409/101431; Y10T409/103816; Y10T409/103975; Y10T409/104134; Y10T409/104452
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
117 words
In the method of making bevel gears having tapering tooth slots using a tool mounted in a movable toolholder and a workholder mounting a workpiece, with means providing for generating rolls between tool and workpiece, a preliminary roughing operation comprising the steps of: effecting a plunge feed between the tool and the workpiece to provide a partial tooth slot of less than the depth of the final, desired, roughed tooth slot; providing a cutting, generating, forward roll between the tool and workpiece; and then providing a return roll between the tool and workpiece, said forward and return rolls each terminating short of the roll out points of generation at both the toe and heel of the workpieCe.
Claim 2
Dependent Claim
117 words
In the method of making bevel gears having tapering tooth slots using a tool mounted in a movable toolholder and a workholder mounting a workpiece, with means providing for generating rolls between tool and workpiece, a preliminary roughing operation comprising the steps of: effecting a plunge feed between the tool and the workpiece to provide a partial tooth slot of less than the depth of the final, desired, roughed tooth slot; providing a cutting, generating, forward roll between the tool and workpiece; and then providing a return roll between the tool and workpiece, said forward and return rolls each terminating short of the roll out points of generation at both the toe and heel of the workpieCe.
Claim 3
Dependent Claim
35 words
The method defined in claim 1 wherein there is no cutting action on the return roll, and wherein there is no additional depth feed between the tool and the workpiece during the forward generating roll.
Claim 4
Dependent Claim
30 words
The method defined in claim 1 wherein the workpiece is a bevel pinion gear blank and wherein the plunge feed occurs in the region of the heel of the workpiece.
Claim 5
Dependent Claim
133 words
In the method of making bevel gears of tapering tooth slots wherein gear blanks are first rough cut and wherein there are provided two rough cutting stations, each including a tool mounted in a movable toolholder and a workholder mounting a workpiece and means providing for generating rolls between tool and workpiece, and improvement which comprises: subjecting a workpiece to a first roughing operation at the first of said stations wherein tooth slots are rough cut in the workpiece only to partial depth; transferring the workpiece to the second of said roughing stations; and completing the roughing operation at said second station, by a further rough cut wherein the tooth slots are shaped more substantially to the desired, finished configuration thereof and including removal of material from the bottom of the tooth slots.
Claim 6
Dependent Claim
133 words
In the method of making bevel gears of tapering tooth slots wherein gear blanks are first rough cut and wherein there are provided two rough cutting stations, each including a tool mounted in a movable toolholder and a workholder mounting a workpiece and means providing for generating rolls between tool and workpiece, and improvement which comprises: subjecting a workpiece to a first roughing operation at the first of said stations wherein tooth slots are rough cut in the workpiece only to partial depth; transferring the workpiece to the second of said roughing stations; and completing the roughing operation at said second station, by a further rough cut wherein the tooth slots are shaped more substantially to the desired, finished configuration thereof and including removal of material from the bottom of the tooth slots.
Claim 7
Dependent Claim
52 words
The method defined in claim 4 wherein said first roughing operation includes: effecting a plunge feed between the tool and the workpiece at the beginning of the cutting cycle for a tooth slot and terminating the plunge feed at a depth less than the depth of the final, desired, roughed tooth slot.
Claim 8
Dependent Claim
73 words
The method defined in claim 5 wherein said first roughing operation further includes a cutting, generating, forward roll between tool and workpiece at the end of said plunge feed while still only cutting the tooth slot to partial depth, and then effecting a return roll between tool and workpiece, said forward and return rolls each terminating short of the roll out points of generation at both the toe and heel of the workpiece.
Claim 9
Dependent Claim
16 words
The method defined in claim 6 wherein there is no cutting action on the return roll.
Claim 10
Dependent Claim
18 words
The method defined in claim 6 wherein there are no setovers at the end of the cutting roll.
Claim 11
Dependent Claim
44 words
The method defined in claim 4 wherein the second roughing operation includes a first generating roll, and a return generating roll, with cutting being performed during both rolls, and with the ratio of roll between tool and workpiece different for each of said rolls.
Claim 12
Dependent Claim
25 words
The method defined in claim 9 and further wherein cutting operations are going on simultaneously on two different workpieces, one at each of said stations.
Claim 13
Dependent Claim
61 words
The method defined in claim 10 and further including feeding workpieces in the form of gear blanks to a first region adjacent and first roughing station, automatically and periodically feeding gear blanks from said region to said first cutting station and then to said second cutting station and then to a discharge region, so as to provide a single production line.
Claim 14
Dependent Claim
50 words
The method defined in claim 11 wherein said discharge region coincides with said first region and further wherein the workpiece is automatically positioned in the workholder in said second station in a certain, predetermined relation to the tool at that station for automatic stock division during the second roughing operation.
Claim 15
Dependent Claim
44 words
The method defined in claim 6 wherein the second roughing operation includes a first generating roll, and a return generating roll, with cutting being performed during both rolls, and with the ratio of roll between tool and workpiece different for each of said rolls.
Claim 16
Dependent Claim
25 words
The method defined in claim 13 and further wherein cutting operations are going on simultaneously on two different workpieces, one at each of said stations.
Claim 17
Dependent Claim
61 words
The method defined in claim 14 and further including feeding workpieces in the form of gear blanks to a first region adjacent said first roughing station, automatically and periodically feeding gear blanks from said region to said first cutting station and then to said second cutting station and then to a dIscharge region, so as to provide a single production line.
Claim 18
Dependent Claim
50 words
The method defined in claim 15 wherein said discharge region coincides with said first region and further wherein the workpiece is automatically positioned in the workholder in said second station in a certain, predetermined relation to the tool at that station for automatic stock division during the second roughing operation.
Claim 19
Dependent Claim
215 words
In the method of making bevel gears having tapering tooth slots using a tool mounted in a movable toolholder and a workholder mounting a workpiece, with means providing for generating rolls between tool and workpiece, a preliminary roughing operation for forming roughed tooth slots in sequence and comprising the steps of: effecting a plunge feed between the tool and the workpiece to provide a partial tooth slot of less than the depth of the final, desired, roughed tooth slot; providing a cutting, generating forward roll between the tool and workpiece whereby the preliminary, roughed tooth slot is produced; then providing a return roll between tool and workpiece during which no cutting takes place and indexing the workpiece for the next tooth slot to be cut therein; providing a partial forward generating roll without cutting prior to forming the next tooth slot; effecting a plunge feed between the tool and the workpiece to provide a partial tooth slot of less than the final, desired depth for the next roughed tooth slot; and then providing a cutting forward generating roll between tool and workpiece whereby the next preliminary, roughed tooth slot is produced, said forward and return rolls each terminating short of the roll out points of generation at both the toe and heel of the workpiece.
Claim 20
Dependent Claim
215 words
In the method of making bevel gears having tapering tooth slots using a tool mounted in a movable toolholder and a workholder mounting a workpiece, with means providing for generating rolls between tool and workpiece, a preliminary roughing operation for forming roughed tooth slots in sequence and comprising the steps of: effecting a plunge feed between the tool and the workpiece to provide a partial tooth slot of less than the depth of the final, desired, roughed tooth slot; providing a cutting, generating forward roll between the tool and workpiece whereby the preliminary, roughed tooth slot is produced; then providing a return roll between tool and workpiece during which no cutting takes place and indexing the workpiece for the next tooth slot to be cut therein; providing a partial forward generating roll without cutting prior to forming the next tooth slot; effecting a plunge feed between the tool and the workpiece to provide a partial tooth slot of less than the final, desired depth for the next roughed tooth slot; and then providing a cutting forward generating roll between tool and workpiece whereby the next preliminary, roughed tooth slot is produced, said forward and return rolls each terminating short of the roll out points of generation at both the toe and heel of the workpiece.
Claim 21
Independent Claim
150 words
A method of rough cutting bevel gears in two successive operations at two successive stations wherein each station includes a tool mounted in a movable toolholder and a workholder mounting a workpiece, with means providing for generating rolls between tool and workpiece, the first of said operations comprising a plunge feed between the tool and the workpiece without a generating roll and only to partial depth of the final roughed tooth slot desired and thereafter providing a cutting, generating roll at the same partial depth to produce a preliminary, roughed tooth slot, and thereafter providing for relative withdrawal between the tool and the workpiece and rapid return roll between the tool and the workpiece, and then indexing the workpiece for the next tooth slot to be roughed, and the second of said operations comprising cutting the preliminary roughed tooth slots to the depth desired for the final roughed tooth slot.
Claim 22
Independent Claim
150 words
A method of rough cutting bevel gears in two successive operations at two successive stations wherein each station includes a tool mounted in a movable toolholder and a workholder mounting a workpiece, with means providing for generating rolls between tool and workpiece, the first of said operations comprising a plunge feed between the tool and the workpiece without a generating roll and only to partial depth of the final roughed tooth slot desired and thereafter providing a cutting, generating roll at the same partial depth to produce a preliminary, roughed tooth slot, and thereafter providing for relative withdrawal between the tool and the workpiece and rapid return roll between the tool and the workpiece, and then indexing the workpiece for the next tooth slot to be roughed, and the second of said operations comprising cutting the preliminary roughed tooth slots to the depth desired for the final roughed tooth slot.
Claim 23
Dependent Claim
43 words
The method defined in claim 18 wherein said second operation includes a first generating roll, and a second generating roll, with cutting being performed during both rolls and with the ratio of roll between tool and workpiece different for each of said rolls.
Claim 24
Dependent Claim
36 words
The method defined in claim 1 wherein the forward and return generating rolls each terminate a relatively substantial distance short of the roll out points of generation at both the toe and heel of the workpiece.
Claim 25
Dependent Claim
129 words
In the method of making bevel gears having tapering tooth slots using a tool mounted in a movable toolholder and a workholder mounting a workpiece, with means providing for generating rolls between tool and workpiece, rough cutting the tooth slots in the workpiece in two separate stages wherein the first stage comprises the steps of: effecting a plunge feed between the tool and the workpiece to provide a partial tooth slot of less than the depth of the final, desired, roughed tooth slot; providing a cutting, generating, forward roll between the tool and workpiece; and then providing a return roll between the tool and workpiece, said forward and return rolls each terminating short of the roll out points of generation at both the toe and heel of the workpiece.
Claim 26
Dependent Claim
129 words
In the method of making bevel gears having tapering tooth slots using a tool mounted in a movable toolholder and a workholder mounting a workpiece, with means providing for generating rolls between tool and workpiece, rough cutting the tooth slots in the workpiece in two separate stages wherein the first stage comprises the steps of: effecting a plunge feed between the tool and the workpiece to provide a partial tooth slot of less than the depth of the final, desired, roughed tooth slot; providing a cutting, generating, forward roll between the tool and workpiece; and then providing a return roll between the tool and workpiece, said forward and return rolls each terminating short of the roll out points of generation at both the toe and heel of the workpiece.
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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |