CA2421898A1 - Method of spinning a pulley from a tubular blank - Google Patents
Method of spinning a pulley from a tubular blank Download PDFInfo
- Publication number
- CA2421898A1 CA2421898A1 CA002421898A CA2421898A CA2421898A1 CA 2421898 A1 CA2421898 A1 CA 2421898A1 CA 002421898 A CA002421898 A CA 002421898A CA 2421898 A CA2421898 A CA 2421898A CA 2421898 A1 CA2421898 A1 CA 2421898A1
- Authority
- CA
- Canada
- Prior art keywords
- spinning
- pulley
- hub
- tubular blank
- tubular member
- 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.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/14—Spinning
- B21D22/16—Spinning over shaping mandrels or formers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/26—Making other particular articles wheels or the like
- B21D53/261—Making other particular articles wheels or the like pulleys
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pulleys (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Forging (AREA)
Abstract
The invention comprises a method of spinning a pulley using a tubular blank. A tubular blank (B) is placed in a spinning machine mandrel (10). The hub (14) is formed by spinning down, or inward, one end of the tubular blank, while leaving the other end as a cup for either spinning a pulley or sprocket profile. This process results in natural thickening of metal at the hub by maintaining a constant volume of metal while reducing the diameter of the tu be during the spinning process.
Description
Title Method of Spinning a Pulley From A Tubular Blank Field of the Invention The invention relates to power transmission pulleys, and more particularly to a method of spinning a pulley from a tubular blank.
Background of the Invention Pulleys and sprockets are widely known and used as a means of transmitting power between shafts. Power transmission pulleys are made in several ways. Sheet metal types are fabricated by spinning or cam dies. In this method, the belt profile is formed in a radial motion of the die to the blank.
Representative of the art is U.S. patent no. 4,840,607 (1989) to Hitchcock et al. which discloses a spun formed poly-v belt pulley formed with a "can-shaped" blank by compressing material in a groove formation area.along a side of the blank. This invention does not afford flexibility on the thickness of the hub area nor is it a one step process.
The prior art also relies on the can-shaped blank having a proper pre-formed thickness for the web. The pulleys are simply pressed into shape with existing pre-form web thickness. Further, the pre-form requires a forming step that precedes the spinning step, adding cost to the finished part. Other prior art pulleys rely on horizontal forming, for example as shown in U.S. patent no. 5,987,952, which does not afford the most advantageous plastic flow of the sheet metal for the application described herein. The process relies on spinning the metal on the face of a round blank from the outside to the middle, until the gathered metal is formed around a central post to form the hub. This process requires a certain diameter for the part and its blank to make it possible to gather the required volume of metal. For parts having a small diameter or a very long and or thick hub, there is not enough surface area to gather the required volume of metal.
What is needed is a method of spinning a pulley using a tubular blank. What is needed is a method of spinning a pulley from a tubular blank by gathering metal inwards toward a hub end of a tubular blank. What is needed is a method of spinning a pulley using a tubular blank that affords inwardly gathering a higher volume of gathered metal. The present invention meets these needs.
Summary of the Invention The primary aspect of the present invention is to provide a method of spinning a pulley using a tubular blank.
Another aspect of the invention is to provide a method of spinning a pulley from a tubular blank by gathering metal inwards toward a hub~end of a tubular blank.
Another aspect of the invention is to provide 'a method of spinning a pulley from a tubular blank that affords inwardly gathering a higher volume of gathered metal.
Other aspects of the invention will be pointed out or made apparent~by the following description of the invention and the accompanying drawings.
The invention comprises a method of spinning a pulley using a tubular blank. A tubular blank is placed in a spinning machine mandrel. The hub is formed by spinning down, or inward, one end of the tubular blank, while leaving the other end as a cup for either spinning a pulley or sprocket profile. This process results in natural thickening of metal at the hub by maintaining a constant volume of metal while reducing the diameter of the tube during the spinning process. A desired profile is then spun into the rim of the pulley.
Brief Description of the Drawings Fig. 1 depicts a cross-sectional view of a tubular blank.
Fig. 2 depicts a cross-sectional view of a tubular blank on a mandrel.
Fig. 3 depicts a cross-sectional view of a form roller as it forms a tubular blank.
Fig. 4 depicts a cross-sectional view of a fully formed pulley.
Description of the Preferred Embodiment of the Invention Fig. 1 depicts a cross-sectional view of a tubular blank. The tubular member or blank comprises a cut piece of tube, pipe, or a deep drawn cup with the bottom punched out.
The tubular blank has a length L, diameter D1, and thickness T1.
Fig. 2 depicts a cross-sectional view of a tubular blank on a mandrel. The process begins by placing the tubular blank B on an appropriately sized mandrel 10. The diameter D1 may be sufficient to create a slight interference fit between blank and the mandrel, or the blank may be clamped to the mandrel by means known in the art.
The mandrel and blank are then rotated by headstock 10.
Form roller 12 is moveable radially and axially by equipment known in the art in order to properly form the blank. To form the pulley, the mandrel is rotated. The form roller is moved into contact with the side of the tubular blank at a location chosen by the operator. As the form roller moves inwardly, the metal is gathered in a steadily decreasing diameter at a~ hub location about the tailstock. Since the volume of metal is unchanged by the process, the decreasing diameter causes the hub portion to thicken as the form roller moves inward.
Fig. 3 depicts a cross-sectional view of a form roller as it forms a tubular blank. Form roller 12 is shown moving in an inward radial direction M1. As the form roller moves inward, the metal is gathered ahead of the form roller, thereby creating hub 14 as the diameter D~ of the hub 14 is progressively reduced. The metal is gathered and the hub is formed about tailstock 11 as the form roller continues to move inward. Form roller 12 may follow the contour 15 of the mandrel 10 in order to give proper form to the finished part. It may also taper the profile of the web as required by a user, resulting in tapered profile that thickens from the rim toward the hub area. The path of the form roller may also be axially adjusted as it moves inward in order to vary the thickness of the web 17. In this manner, a web thickness may be tapered, varied, or held constant as required by a user. Web 17 may also be spun into a concave or combination or concave/convex shapes to further strengthen the web.
Fig. 4 depicts a cross-sectional view of a fully formed pulley. The inside diameter D3 of the hub is determined by the width of the tailstock I1. The gathered metal at hub 14 has thickness T2, which is significantly greater than the initial thickness T1. To finish the hub, finishing roller 13, moved in direction M~, is then used to shape the final form of hub 14. The final form or shape of hub 14 is made by the profile of the finishing roller. Finishing roller 13 may have any profile required by a user that is known in the art. Hub thickness may be kept at T~, or it can also be reduced to thickness T3, to form a pulley.
Once the part is formed, it is removed from the mandrel for final shaping of the rim or belt bearing surface 16 as required by a user. A shaping roller (not shown) is used to shape the belt bearing surface. The belt bearing surface may be given a v-belt profile, a mufti-ribbed profile, or any other profile known in the art by metal forming means.
Although a single form of the invention has been described herein, it will be obvious to those skilled in the art that variations may be made in the construction and relation of parts without departing from the spirit and scope of the invention described herein.
Background of the Invention Pulleys and sprockets are widely known and used as a means of transmitting power between shafts. Power transmission pulleys are made in several ways. Sheet metal types are fabricated by spinning or cam dies. In this method, the belt profile is formed in a radial motion of the die to the blank.
Representative of the art is U.S. patent no. 4,840,607 (1989) to Hitchcock et al. which discloses a spun formed poly-v belt pulley formed with a "can-shaped" blank by compressing material in a groove formation area.along a side of the blank. This invention does not afford flexibility on the thickness of the hub area nor is it a one step process.
The prior art also relies on the can-shaped blank having a proper pre-formed thickness for the web. The pulleys are simply pressed into shape with existing pre-form web thickness. Further, the pre-form requires a forming step that precedes the spinning step, adding cost to the finished part. Other prior art pulleys rely on horizontal forming, for example as shown in U.S. patent no. 5,987,952, which does not afford the most advantageous plastic flow of the sheet metal for the application described herein. The process relies on spinning the metal on the face of a round blank from the outside to the middle, until the gathered metal is formed around a central post to form the hub. This process requires a certain diameter for the part and its blank to make it possible to gather the required volume of metal. For parts having a small diameter or a very long and or thick hub, there is not enough surface area to gather the required volume of metal.
What is needed is a method of spinning a pulley using a tubular blank. What is needed is a method of spinning a pulley from a tubular blank by gathering metal inwards toward a hub end of a tubular blank. What is needed is a method of spinning a pulley using a tubular blank that affords inwardly gathering a higher volume of gathered metal. The present invention meets these needs.
Summary of the Invention The primary aspect of the present invention is to provide a method of spinning a pulley using a tubular blank.
Another aspect of the invention is to provide a method of spinning a pulley from a tubular blank by gathering metal inwards toward a hub~end of a tubular blank.
Another aspect of the invention is to provide 'a method of spinning a pulley from a tubular blank that affords inwardly gathering a higher volume of gathered metal.
Other aspects of the invention will be pointed out or made apparent~by the following description of the invention and the accompanying drawings.
The invention comprises a method of spinning a pulley using a tubular blank. A tubular blank is placed in a spinning machine mandrel. The hub is formed by spinning down, or inward, one end of the tubular blank, while leaving the other end as a cup for either spinning a pulley or sprocket profile. This process results in natural thickening of metal at the hub by maintaining a constant volume of metal while reducing the diameter of the tube during the spinning process. A desired profile is then spun into the rim of the pulley.
Brief Description of the Drawings Fig. 1 depicts a cross-sectional view of a tubular blank.
Fig. 2 depicts a cross-sectional view of a tubular blank on a mandrel.
Fig. 3 depicts a cross-sectional view of a form roller as it forms a tubular blank.
Fig. 4 depicts a cross-sectional view of a fully formed pulley.
Description of the Preferred Embodiment of the Invention Fig. 1 depicts a cross-sectional view of a tubular blank. The tubular member or blank comprises a cut piece of tube, pipe, or a deep drawn cup with the bottom punched out.
The tubular blank has a length L, diameter D1, and thickness T1.
Fig. 2 depicts a cross-sectional view of a tubular blank on a mandrel. The process begins by placing the tubular blank B on an appropriately sized mandrel 10. The diameter D1 may be sufficient to create a slight interference fit between blank and the mandrel, or the blank may be clamped to the mandrel by means known in the art.
The mandrel and blank are then rotated by headstock 10.
Form roller 12 is moveable radially and axially by equipment known in the art in order to properly form the blank. To form the pulley, the mandrel is rotated. The form roller is moved into contact with the side of the tubular blank at a location chosen by the operator. As the form roller moves inwardly, the metal is gathered in a steadily decreasing diameter at a~ hub location about the tailstock. Since the volume of metal is unchanged by the process, the decreasing diameter causes the hub portion to thicken as the form roller moves inward.
Fig. 3 depicts a cross-sectional view of a form roller as it forms a tubular blank. Form roller 12 is shown moving in an inward radial direction M1. As the form roller moves inward, the metal is gathered ahead of the form roller, thereby creating hub 14 as the diameter D~ of the hub 14 is progressively reduced. The metal is gathered and the hub is formed about tailstock 11 as the form roller continues to move inward. Form roller 12 may follow the contour 15 of the mandrel 10 in order to give proper form to the finished part. It may also taper the profile of the web as required by a user, resulting in tapered profile that thickens from the rim toward the hub area. The path of the form roller may also be axially adjusted as it moves inward in order to vary the thickness of the web 17. In this manner, a web thickness may be tapered, varied, or held constant as required by a user. Web 17 may also be spun into a concave or combination or concave/convex shapes to further strengthen the web.
Fig. 4 depicts a cross-sectional view of a fully formed pulley. The inside diameter D3 of the hub is determined by the width of the tailstock I1. The gathered metal at hub 14 has thickness T2, which is significantly greater than the initial thickness T1. To finish the hub, finishing roller 13, moved in direction M~, is then used to shape the final form of hub 14. The final form or shape of hub 14 is made by the profile of the finishing roller. Finishing roller 13 may have any profile required by a user that is known in the art. Hub thickness may be kept at T~, or it can also be reduced to thickness T3, to form a pulley.
Once the part is formed, it is removed from the mandrel for final shaping of the rim or belt bearing surface 16 as required by a user. A shaping roller (not shown) is used to shape the belt bearing surface. The belt bearing surface may be given a v-belt profile, a mufti-ribbed profile, or any other profile known in the art by metal forming means.
Although a single form of the invention has been described herein, it will be obvious to those skilled in the art that variations may be made in the construction and relation of parts without departing from the spirit and scope of the invention described herein.
Claims (4)
1. A method of spinning a pulley comprising the steps of:
forming a tubular member having a length and a tubular member diameter and an initial thickness;
spinning the tubular member with a mandrel;
pressing a forming roller against a side of the tubular member;
moving the forming roller radially inwardly against the tubular member;
decreasing the tubular member diameter along a length portion;
gathering inwardly displaced metal about a tailstock at a hub location;
terminating movement of the forming roller; and retracting the forming roller.
forming a tubular member having a length and a tubular member diameter and an initial thickness;
spinning the tubular member with a mandrel;
pressing a forming roller against a side of the tubular member;
moving the forming roller radially inwardly against the tubular member;
decreasing the tubular member diameter along a length portion;
gathering inwardly displaced metal about a tailstock at a hub location;
terminating movement of the forming roller; and retracting the forming roller.
2. The method of spinning a pulley as in claim 1 further comprising the step of:
terminating movement of the forming roller when the hub has a thickness in excess of the initial thickness.
terminating movement of the forming roller when the hub has a thickness in excess of the initial thickness.
3. The method of spinning a pulley as in claim 2 further comprising the step of:
pressing a finishing roller against the hub to form a hub shape and a thickness.
pressing a finishing roller against the hub to form a hub shape and a thickness.
4. The method of spinning a pulley as in claim 3 further comprising the steps of:
pressing a shaping roller against an outer belt bearing surface of the tubular member; and moving the shaping roller to form a profile on the outer belt bearing surface.
pressing a shaping roller against an outer belt bearing surface of the tubular member; and moving the shaping roller to form a profile on the outer belt bearing surface.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US65460600A | 2000-09-01 | 2000-09-01 | |
| US09/654,606 | 2000-09-01 | ||
| PCT/US2001/026923 WO2002020192A2 (en) | 2000-09-01 | 2001-08-29 | Method of spinning a pulley from a tubular blank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2421898A1 true CA2421898A1 (en) | 2002-03-14 |
Family
ID=24625537
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002421898A Abandoned CA2421898A1 (en) | 2000-09-01 | 2001-08-29 | Method of spinning a pulley from a tubular blank |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP1313576A2 (en) |
| JP (1) | JP3935429B2 (en) |
| KR (1) | KR20030059799A (en) |
| CN (1) | CN1264623C (en) |
| AU (1) | AU8849701A (en) |
| BR (1) | BR0113427A (en) |
| CA (1) | CA2421898A1 (en) |
| MX (1) | MXPA03002797A (en) |
| WO (1) | WO2002020192A2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6983632B2 (en) * | 2002-11-20 | 2006-01-10 | Hess Engineering, Inc. | Method and apparatus for spinning to a constant length |
| DE102010053634B4 (en) * | 2010-12-07 | 2012-10-25 | Leifeld Metal Spinning Ag | A method for producing a tubular container and associated apparatus for forming a pipe section |
| KR200461590Y1 (en) | 2012-02-10 | 2012-07-23 | 윤미정 | apparatus for deforming end part of pipe |
| BR102014000067A2 (en) * | 2014-01-03 | 2015-11-17 | Antônio Carlos Torres | water reservoir manufactured by the process of spouting |
| EP3856430A4 (en) * | 2018-09-27 | 2022-07-06 | Inno-Spin LLC | Multi-axis roll-forming of stepped-diameter cylinder |
| EP3856429A4 (en) * | 2018-09-27 | 2022-06-22 | Inno-Spin LLC | Multi-axis roll-forming methods, systems, and products |
| CN112371864B (en) * | 2020-10-23 | 2021-07-02 | 江苏国富氢能技术装备股份有限公司 | Core-free spinning closing method for aluminum liner of high-pressure hydrogen bottle |
| CN117600308A (en) * | 2023-12-12 | 2024-02-27 | 中信戴卡股份有限公司 | Symmetrical spinning forming equipment and method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1094356A (en) * | 1977-02-04 | 1981-01-27 | Drive Manufacturing Inc. | Method of pulley manufacture and product |
| DE19511963C2 (en) * | 1995-03-31 | 2000-12-07 | Leifeld Gmbh & Co | Process for the production of rotationally symmetrical metallic workpieces |
| DE19620812B4 (en) * | 1996-05-23 | 2005-07-28 | Leifeld Metal Spinning Gmbh | Method for producing a rotationally symmetrical body |
-
2001
- 2001-08-29 CA CA002421898A patent/CA2421898A1/en not_active Abandoned
- 2001-08-29 MX MXPA03002797A patent/MXPA03002797A/en unknown
- 2001-08-29 CN CNB018149944A patent/CN1264623C/en not_active Expired - Fee Related
- 2001-08-29 KR KR10-2003-7002443A patent/KR20030059799A/en not_active Application Discontinuation
- 2001-08-29 JP JP2002524658A patent/JP3935429B2/en not_active Expired - Fee Related
- 2001-08-29 WO PCT/US2001/026923 patent/WO2002020192A2/en not_active Application Discontinuation
- 2001-08-29 EP EP01968237A patent/EP1313576A2/en not_active Ceased
- 2001-08-29 BR BR0113427-2A patent/BR0113427A/en not_active Application Discontinuation
- 2001-08-29 AU AU8849701A patent/AU8849701A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| KR20030059799A (en) | 2003-07-10 |
| CN1264623C (en) | 2006-07-19 |
| WO2002020192A2 (en) | 2002-03-14 |
| JP3935429B2 (en) | 2007-06-20 |
| EP1313576A2 (en) | 2003-05-28 |
| MXPA03002797A (en) | 2003-07-14 |
| AU8849701A (en) | 2002-03-22 |
| CN1568235A (en) | 2005-01-19 |
| WO2002020192A3 (en) | 2002-07-04 |
| BR0113427A (en) | 2003-07-01 |
| JP2004508197A (en) | 2004-03-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |