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

Definitions

• the invention relates to power transmission pulleys, and more particularly to a method of spinning a pulley from a tubular blank.
• 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.
• 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.
• 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 .
• 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.
• 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.
• 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 Di, and thickness
• 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 Di 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.
• Form roller 12 is moveable radially and axially by equipment known in the art in order to properly form the blank.
• 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.
• 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 Mi.
• the metal is gathered ahead of the form roller, thereby creating hub 14 as the diameter D 2 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 D 3 of the hub is determined by the width of the tailstock 11.
• the gathered metal at hub 14 has thickness T 2 , which is significantly greater than the initial thickness Ti.
• finishing roller 13 moved in direction M 2 , 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 2 , or it can also be reduced to thickness T 3 , to form a puller.
• 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 multi-ribbed profile, or any other profile known in the art by metal forming means.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Pulleys (AREA)
• Shaping Metal By Deep-Drawing, Or The Like (AREA)
• Forging (AREA)

Priority Applications (7)

Applications Claiming Priority (2)

Publications (2)

Family

ID=24625537

Family Applications (1)

Country Status (9)

Cited By (6)

Families Citing this family (2)

Citations (3)

• 2001
  • 2001-08-29 WO PCT/US2001/026923 patent/WO2002020192A2/en not_active Application Discontinuation
  • 2001-08-29 BR BR0113427-2A patent/BR0113427A/pt not_active Application Discontinuation
  • 2001-08-29 CN CNB018149944A patent/CN1264623C/zh not_active Expired - Fee Related
  • 2001-08-29 EP EP01968237A patent/EP1313576A2/en not_active Ceased
  • 2001-08-29 JP JP2002524658A patent/JP3935429B2/ja not_active Expired - Fee Related
  • 2001-08-29 MX MXPA03002797A patent/MXPA03002797A/es unknown
  • 2001-08-29 KR KR10-2003-7002443A patent/KR20030059799A/ko not_active Application Discontinuation
  • 2001-08-29 AU AU8849701A patent/AU8849701A/xx active Pending
  • 2001-08-29 CA CA002421898A patent/CA2421898A1/en not_active Abandoned

Patent Citations (3)

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