US3605468A - Gear rolling - Google Patents
Gear rolling Download PDFInfo
- Publication number
- US3605468A US3605468A US847213A US3605468DA US3605468A US 3605468 A US3605468 A US 3605468A US 847213 A US847213 A US 847213A US 3605468D A US3605468D A US 3605468DA US 3605468 A US3605468 A US 3605468A
- Authority
- US
- United States
- Prior art keywords
- teeth
- blank
- gear
- rolling
- adjacent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H5/00—Making gear wheels, racks, spline shafts or worms
- B21H5/02—Making gear wheels, racks, spline shafts or worms with cylindrical outline, e.g. by means of die rolls
- B21H5/022—Finishing gear teeth with cylindrical outline, e.g. burnishing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49462—Gear making
- Y10T29/49467—Gear shaping
- Y10T29/49471—Roll forming
Definitions
- this may be accomplished by hobbing the gear teeth on the blank or hobbing partially formed gear teeth on the blank in an operation characterized by a plunge feed without normal traverse between the gear and hob.
- this operation with a particular diameter hob produces too much material adjacent the ends of the teeth, the operation may include limited relative traverse while the hob contacts the blank intermediate its sides in order to control the extra material provided adjacent the ends of the gear teeth.
- the hobbing operation may be accompanied by relative traverse between the gear and hob to extend the cutting action from one side of the blank to the other but this traverse is further accompanied by a radial in and out feed so that more material is removed from the blank adjacent its mid-plane than adjacent the ends thereof.
- FIG. 1 is a fragmentary diagrammatic view illustrating the condition of a rolled gear as compared to the desired form.
- FIG. 2 is a fragmentary sectional view on the line 2--2, FIG. 1.
- FIG. 3 is a plan view of the gear tooth illustrated in FIG. 2.
- FIG. 4 is a diagrammatic sectional view illustrating the form of a gear tooth on a blank prior to rolling.
- FIG. 5 is a plan view of the gear tooth shown in FIG. 4.
- FIG. 6 is a view similar to FIG. 4 illustrating a modified tooth form.
- FIG. 7 is a plan view of the tooth shown in FIG. 6.
- the gear teeth prior to the rolling operation will be partially formed by a cutting operation.
- the gears are cut so as to leave a few thousandths of an inch of material which is then displaced by pressure generated between the teeth of the gear and the teeth of a pair of opposed rolling dies.
- the operation is not considered to be a finishing operation but as a roughing or final roughing operation.
- the teeth are partially formed by a cutting operation such for example as breaching, hobbing, shaping or the like.
- FIGS. 1-3 there is illustrated in full lines the shape of a desired gear tooth 10, the tooth usually having uniform cross-section from end to end although it may in some cases be somewhat reduced at the ends in the form of crowned gear teeth familiar in the art.
- the material of the gear blank is not fully confined during the operation, it is found that adjacent the ends of the teeth material flows outwardly beyond the sides 12 of the blank as indicated at 14, and accordingly, the teeth do not fully fill either at the tops thereof as indicated by the dotted lines at 16, or on the sides thereof, as indicated by the dotted lines at 18.
- a tooth as viewed from the end has a central portion as seen in FIG. 1, which conforms to the desired form illustrated in full lines while the ends of the teeth are reduced either in height or thickness, or both, as indicated by the dotted lines.
- FIG. 4 there is shown a fragmentary section of a blank 20 having teeth 22 which are of increased depth as indicated at 24 centrally thereof and which are of lesser thickness as indicated at 26 centrally thereof as compared to the ends.
- a blank having teeth of this form may conveniently be produced by a hobbing operation in which a hob of predetermined diameter is employed in a hobbing operation characterized by a plunge feed in which no traverse axially of the blank is provided between the blank and the hob. It will be appreciated that the shape of the teeth resulting from this operation will be determined largely by the size of the hob and accordingly, the excess material left adjacent the ends of the teeth may be predetermined by selecting a hob of appropriate size.
- the material displaced beyond the sides of the blank can be removed by any suitable machining process.
- the method of rolling gears which comprises forming a blank with teeth having excess material to be displaced by a rolling operation between a pair of opposed gear-like rolling dies with their axes parallel to the axis of the blank, which comprises initially forming the teeth on the blank of longitudinally concave configuration to provide excess material adjacent the ends of the teeth, rolling the blank in pressure contact with the dies, and feeding the dies radially inwardly of the blank to desired depth to displace material into the final desired gear form from end to end of the teeth between the sides of the blank and to displace some excess material laterally beyond the sides of the blank.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gear Processing (AREA)
- Gears, Cams (AREA)
Abstract
Description
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US84721369A | 1969-08-04 | 1969-08-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3605468A true US3605468A (en) | 1971-09-20 |
Family
ID=25300081
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US847213A Expired - Lifetime US3605468A (en) | 1969-08-04 | 1969-08-04 | Gear rolling |
Country Status (2)
Country | Link |
---|---|
US (1) | US3605468A (en) |
JP (1) | JPS4831463B1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5379620A (en) * | 1993-06-23 | 1995-01-10 | Kinefac Corporation | Apparatus and method for forming precision surfaces on shaft-like components |
EP1063032A1 (en) * | 1999-06-22 | 2000-12-27 | M.G. - MINI GEARS S.p.A. | Method for producing gear wheels from blanks obtained by sintering metal powders |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006231385A (en) * | 2005-02-28 | 2006-09-07 | Nachi Fujikoshi Corp | Forming rack |
-
1969
- 1969-08-04 US US847213A patent/US3605468A/en not_active Expired - Lifetime
-
1970
- 1970-06-01 JP JP45046424A patent/JPS4831463B1/ja active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5379620A (en) * | 1993-06-23 | 1995-01-10 | Kinefac Corporation | Apparatus and method for forming precision surfaces on shaft-like components |
US5497642A (en) * | 1993-06-23 | 1996-03-12 | Kinefac Corporation | Apparatus and method for forming precision surfaces on shaft-like components |
EP1063032A1 (en) * | 1999-06-22 | 2000-12-27 | M.G. - MINI GEARS S.p.A. | Method for producing gear wheels from blanks obtained by sintering metal powders |
Also Published As
Publication number | Publication date |
---|---|
JPS4831463B1 (en) | 1973-09-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: ADD, INC., A MICHIGAN CORP.,STATELESS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LEAR SIEGLER, INC. A DE. CORP.;REEL/FRAME:004600/0061 Effective date: 19860530 Owner name: ADD, INC., A MICHIGAN CORP. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:LEAR SIEGLER, INC. A DE. CORP.;REEL/FRAME:004600/0061 Effective date: 19860530 |
|
AS | Assignment |
Owner name: NATIONAL BROACH & MACHINE COMPANY, Free format text: CHANGE OF NAME;ASSIGNOR:ADD, INC.;REEL/FRAME:004664/0771 Effective date: 19860708 |
|
AS | Assignment |
Owner name: RAO, SURENDRA B. Free format text: SECURITY INTEREST;ASSIGNOR:NATIONAL BROACH & MACHINE COMPANY;REEL/FRAME:005033/0527 Effective date: 19880928 Owner name: FERRETT, JAMES A. Free format text: SECURITY INTEREST;ASSIGNOR:NATIONAL BROACH & MACHINE COMPANY;REEL/FRAME:005033/0527 Effective date: 19880928 Owner name: WILKINS, LEONARD J. Free format text: SECURITY INTEREST;ASSIGNOR:NATIONAL BROACH & MACHINE COMPANY;REEL/FRAME:005033/0527 Effective date: 19880928 Owner name: DONNELLY, JOHN T.; Free format text: SECURITY INTEREST;ASSIGNOR:NATIONAL BROACH & MACHINE COMPANY;REEL/FRAME:005033/0527 Effective date: 19880928 |
|
AS | Assignment |
Owner name: NATIONAL BROACH & MACHINE COMPANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. SECURITY AGREEMENT RECORDED AT REEL 5033 FRAME 0527;ASSIGNORS:DONNELLY, JOHN T.;WILKINS, LEONARD J.;FERRETT, JAMES A.;AND OTHERS;REEL/FRAME:005639/0406 Effective date: 19910312 |