[특허]Circular and oval flanged rings for ducting and method of making

Hermanson,Jeffrey A.

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특허 상세정보

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Circular and oval flanged rings for ducting and method of making

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B21D-022/00
미국특허분류(USC)	072/085; 072/084; 029/890.15
출원번호	US-0009356 (2004-12-10)
발명자 / 주소	Hermanson,Jeffrey A.
출원인 / 주소	Hermanson,Jeffrey A.
대리인 / 주소	Christensen O'Connor Johnson Kindness PLLC
인용정보	피인용 횟수 : 1 인용 특허 : 5

초록
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A method of making Circular and Oval Flanged Rings, for the connection of thin walled circular and oval ducting, including Circular and Oval Flanged Rings having a Sheet Metal and Air Conditioning Contractors National Association (SMACNA) standard T24 Profile. Thin gauge Lock Form Quality steel, from 10 to 20 gauge, is cut into strips with the strip ends butt welded forming Flanged Ring Band Stock which is inserted and clamped into a Spinning Die. The Spinning Die is rotated by a horizontally configured lathe output shaft presenting the extended portion of the Flanged Ring Band Stock for machine tool forming. Standard machine tools are used to form the Flanged Ring Band Stock into a Circular Flanged Ring including the SMACNA T24 Flanged Ring Profile. A Circular Flanged Ring is cut along a diameter into Semi-circular Flanged Ring Portions; straight segments including segments with SMACNA T24 Linear Segments are roll formed, assembled into a oval shape within a fixture and welded forming the Oval Flanged Ring. The method of making and the Circular and Oval Flanged Rings are disclosed.

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청구항
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The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 1. A method of spin-forming flanged rings from thin gauge metal, said flange rings used for interconnecting adjacent sectional ends of thin gauge ducting for heating, ventilating and air conditioning systems, the ducting having an inner diameter, the method comprising: (a) placing a cylindrical, collar-shaped workpiece composed of 10-gauge or higher gauge metallic material into a spin die, the spin die having an end edge portion, the workpiece being substantially devoid of any deformations along its circumference and having a first end portion extending outwardly of the spin die beyond the end edge portion of the spin die when the workpiece is placed in the spin die; (b) locking the workpiece to the spin die; (c) spinning the cylindrical, collar-shaped workpiece about its central axis substantially corresponding to the concentric center of the workpiece by spinning a spin die; (d) forming the first end portion of the collar-shaped workpiece as the workpiece is spinning to expand the first end portion of the workpiece against the end edge portion of the spin die to define a generally annularly-shaped mating flange extending substantially transversely to the central axis of the remainder of the collar-shaped workpiece, the remainder of the workpiece retaining its original cylindrical, collar-shaped configuration for serving as an insertion flange for insertion within the sectional end of the ducting to be connected; and (e) forming the workpiece as the workpiece is spinning to force the outward marginal portion of the transverse mating flange over, to form a hem section disposed substantially concentrically to the insertion flange and extending outwardly from the mating flange substantially concentrically to the insertion flange. 2. The method according to claim 1, further comprising forming a return flange while the workpiece is spinning by turning a portion of the hem section located distally from the mating flange over on itself. 3. The method according to claim 2, wherein the profile of the spin-formed flange ring corresponds to the standards of the Sheet Metal and Air Conditioning Contractors National Association. 4. The method of claim 1, wherein the hem section extends outwardly from the mating flange in substantially the same direction that the insertion flange extends from the mating flange. 5. The method of claim 4, further comprising forming a return flange with the workpieces spinning by turning a portion of the hem section located distally from the mating flange over on itself. 6. The method according to claim 1: wherein the hem section defining an edge portion distal from the mating flange; further comprising forming a return flange by applying at least one forming tool to the edge portion of the hem section so as to turn a portion of the hem section over on itself as the workpiece is spinning. 7. The method of claim 1, further comprising: (a) diametrically cutting the flanged ring formed by the method of claim 1 into two generally semi-circularly shaped ring halves, each of said ring halves defining an end portion at the end of each semi-circular shaped ring half; (b) placing substantially straight lengths of flange sections between the corresponding ends of the semi-circularly shaped ring halves to form a generally oval shape, the flange straight lengths having been preformed into a cross-sectional shape generally corresponding to the cross-sectional shapes of the two semi-circular ring halves; and (c) affixing the ends of the straight flange lengths to the corresponding ends of the two semi-circular ring halves to form a singular oval-shaped connection ring. 8. The method of claim 7, wherein the substantially straight flange lengths having ends affixed to the corresponding ends of the semi-circular ring halves by welding. 9. The method of claim 1, further comprising forming the collar-shaped workpiece from a length of thin gauge flat stock metal prior to spin-forming the workpiece into the flanged ring. 10. The method according to claim 9, further comprising rolling the thin gauge flat stock metal into a generally circular collar shape defining adjacent end portions, and attaching said end portions together to form a seamless joint. 11. The method of claim 10, further comprising placing the collar-shaped workpiece into the spin die without substantially any further working of the workpiece. 12. A method of forming, by spin-forming techniques, flanged rings from thin gauge metal, said flange rings used for interconnecting adjacent sectional ends of thin gauge ducting for heating, ventilating and air conditioning systems, the ducting having an inner diameter, the method comprising: (a) locking a collar-shaped workpiece in a spin die, the workpiece composed of from 10-20 gauge metallic material, the collar-shaped workpiece being substantially devoid of any crease extending circumferentially around the workpiece, the workpiece having a first end portion and an outer diameter corresponding to the inner diameter of the sectional ends of the ducting to be connected; (b) spinning the spin die with the workpiece lock herein about the central axis of the collar-shaped workpiece; (c) forming the first end portion of the collar-shaped workpiece as the workpiece is spinning to expand the first end portion of the workpiece to define a generally annular shaped mating flange extending generally transversely to the central axis of the remainder of the collar-shaped workpiece to define an outer perimeter, the remainder of the workpiece retaining its original collar-shaped configuration serving as an insertion flange for insertion within the sectional ends of the ducting to be connected; (d) further forming the workpiece as the workpiece is spinning to define a hem section, the hem section extending outwardly from the outer perimeter of the mating flange substantially concentrically to the insertion flange; and (e) forming a return flange while the workpiece is spinning by folding a portion of the hem section located distally from the mating flange over on itself. 13. The method according to claim 12, wherein the profile of the spin-formed flange ring conforms to the standards of the Sheet Metal and Air-Conditioning Contractors National Association. 14. The method of claim 12, further comprising: (a) the generally collar-shaped insertion flange having a desired outer diameter; (b) placing the workpiece into a generally cylindrically shaped spin die prior to spin forming the mating flange, the spin die having an internal diameter substantially corresponding to the desired outside diameter of the insertion flange of the flange ring, the spin die also having a generally annularly shaped end edge corresponding to the annular shape of the mating flange; and (c) rotating the workpiece by rotating the spin die. 15. The method according to claim 12, wherein: (a) the generally cylindrically-shaped spin die having an end edge; (b) when the workpiece is placed into the spin die, a portion of the insertion flange of the workpiece extending outwardly from the interior of the spin die beyond the end edge of the spin die; and (c) the mating flange is spin-formed by using a tool to expand the portion of the workpiece extending outwardly beyond the end edge of the spin die to a position adjacent the end edge of the spin die, with the thusly expanded portion of the workpiece projecting radially beyond the outer diameter of the end edge of the spin die. 16. The method of claim 1, wherein an oval-shaped flanged ring is formed by: (a) diametrically cutting the flanged ring formed by the method of claim 12 into two generally semi-circularly shaped ring halves, each of said ring halves defining an end portion at the end of each semi-circular shaped ring half; (b) placing substantially straight lengths of flange sections between the corresponding ends of the semi-circularly shaped ring halves to form a generally oval shape, the flange straight lengths having been preformed into a cross-sectional shape generally corresponding to the cross-sectional shapes of the two semi-circular ring halves; and (c) affixing the ends of the straight flange lengths to the corresponding ends of the two semi-circular ring halves to form a singular oval-shaped connection ring. 17. The method of claim 12, wherein the substantially straight flange lengths having ends affixed to the corresponding ends of the semi-circular ring halves by welding. 18. The method of claim 14, further comprising forming the collar-shaped workpieces from a length of thin gauge flat stock metal prior to spin-forming the workpiece into the flanged ring. 19. The method according to claim 18, further comprising rolling the thin gauge flat stock metal into a generally circular collar shape defining adjacent end portions, and attaching said end portions together to form a seamless joint.

이 특허에 인용된 특허 (5)

이 특허를 인용한 특허 (1)

Deering, Charles G.; Kruger, Jens H.; Zanon, Philip, Vertical sides banjo tone ring and methods.

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Circular and oval flanged rings for ducting and method of making

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Circular and oval flanged rings for ducting and method of making

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이 특허에 인용된 특허 (5)

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