US3648502A - Method and apparatus for forming a heat exchanger tube with closely spaced integral fins - Google Patents
Method and apparatus for forming a heat exchanger tube with closely spaced integral fins Download PDFInfo
- Publication number
- US3648502A US3648502A US16274A US3648502DA US3648502A US 3648502 A US3648502 A US 3648502A US 16274 A US16274 A US 16274A US 3648502D A US3648502D A US 3648502DA US 3648502 A US3648502 A US 3648502A
- Authority
- US
- United States
- Prior art keywords
- tubular blank
- dies
- roll
- engagement
- pitch
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/20—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes and tubes with decorated walls
- B21C37/207—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes and tubes with decorated walls with helical guides
-
- 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
- Y10T29/4935—Heat exchanger or boiler making
- Y10T29/49377—Tube with heat transfer means
- Y10T29/49378—Finned tube
Definitions
- Fins are formed on a copper heat exchanger tube by a plurality of rolling dies which roll grooves into the surface of the Mar-.41, m
- This invention relates to apparatus and method for manufacturing finned tubing such as used for shell-and-tube type heat exchangers, as for instance, condensers and evaporators for refrigeration machines.
- One method for forming integral fins on copper tubing has been to circumferentially groove the outer portion of the tube and then axially compress the material between adjacent convolutions of the groove to develop therefrom radially projecting fins.
- These operations are usually performed by rollers distributed about the tube in rolling intersecting relationship therewith, each roller having a series of axially spaced roll dies which are progressively increased in width with a correspond ing decrease in width of the spaces or fins therebetween from the leading die to the trailing die.
- the axes of the rollers are normally at a slight angle to the axis of the tube and thus a helical fin is extruded up from the surface of the tube.
- the fins extend radially outward no further than the outer diameter of the original tube so that the finned tube may be freely inserted through the apertures in the tube sheets and tube supports.
- the fin diameter is normally limited to less than the original tube diameter.
- Tubes made by this general method having a diameter of about /8 to about 1 inch are commercially available now with fin densities up to about 25 fins per inch.
- fin densities up to about 25 fins per inch.
- an inferior fin was produced.
- the dies tended to mistrack thus producing fins which were under cut, had laps, were inclined, were notched in the grooves, lacked uniform spacing, had metallic slivers, and had nonuniform radii at their base. After careful investigation it is believed that these defects resulted from tube elongation, especially between adjacent convolutions of the fins.
- the elongation is produced by the excess material made available in the forming of grooves into the tube surface and simultaneous reduction in tube diameter.
- Elongation of tubes in the area of the finning dies has long been recognized as a problem.
- One method to mitigate this problem has been to provide the tube with a twist, simultaneously with the finning operation which it is believed tends to effect a shortening of the tube to compensate for the elongating forces.
- Another method employed to obviate this problem has been to arrange the groove forming roll dies into two or more axially spaced groups. The tube is said to be stressed relieved in the area between the sets of axially spaced dies.
- the instant invention pertains to another method and apparatus for obviating the problems of tube elongation accompanying the formation of grooves within the tube surface.
- tubes having a high quality profile and spacing have been produced in fin densities in excess of 35 fins per inch. This is accomplished by providing a progressively increasing pitch between roll dies on each roll assembly.
- the groove in the tube surface is formed by a procession of roll dies which by their disposition provide for progressive increases in the pitch of the groove which are of such magnitude as to be commensurate with the growth or elongation of the tube in the vicinity ofthe roll dies.
- Yet another object of this invention is to provide the method and apparatus for producing integral fin heat exchanger tubes having extremely uniform fin spacing.
- FIG. 1 is an enlarged and exaggerated section taken substantially at line 1-1 of FIG. 2 showing the tube finning apparatus in the process of forming integral fins upon a tubular blank;
- FIG. 2 is an enlarged and exaggerated end view of the tubular blank and tube finning apparatus shown in FIG. 1;
- FIG. 3 is an exaggerated and further enlarged diagram showing the relative position of the groove forming roll dies of the tube finning apparatus of FIGS. 1 and 2.
- the tube finning apparatus 10 is comprised of an internal mandrel 11 disposed within an elongated copper tubular blank 12 of circular cross section and an external groove forming head 13.
- Head 13 has a cylindrical body 14 which has 5 common central axis 9 with mandrel 11 and tubular blank 12.
- a forward annular plate 15 is disposed at the forward end of cylindrical body 14.
- Plate 15 has a plurality of arculate slots 16 circumferentially arranged about the common axis 9.
- Axially extending bolts 17 disposed within slots 16 and threaded into cylindrical body 14 adjustably secure forward annular plate 15 to the forward end of cylindrical body 141. It will be appreciated that by temporarily loosening bolts 17, forward annular plate 15 may be adjustably rotated relative to cylindrical body 14 about axis 9.
- a rear annular plate 18 is adjustably secured to the rear end of cylindrical body 14 by a plurality of axially extending bolts 19 extending through similar arcuate slots 20.
- Each of forward and rear annular plates 15 and 18 has four equally spaced radially inwardly extending support bars 21 and 22 adjustalbly secured within forward and rear radially extending bores 23 and 24 respectively by set screws 25.
- Bars 21 and 22 and bores 23 and 24 are circular in cross section whereby bars 21 and 22 may be adjustably rotated for reasons herein after described.
- a bearing 28 is supported in each ring 26 and a bearing 35 is supported in each ring 27.
- Each of bearings 28 and 35 has both radial and axial thrust bearing surfaces.
- Roll assemblies A, B, C, and D are joumaled between pairs of bearings 2b and 35 at front and rear ends of head 13.
- Roll assembly A may be substantially identical to that of roll assembly C and roll assembly B may be substantially identical to roll assembly D. It therefore will suffice to describe in detail only roll assemblies A and B.
- Roll assembly A shown in cross section in the upper portion of FIG. 1 includes an arbor 29 journaled at the front and rear ends thereof in a pair of bearings 23 and 35.
- a plurality of roll dies A A A A,,, A A A and A, respectively are disposed from front to rear of arbor 29.
- a plurality of annular spacer shims 30 may be disposed between the roll dies to provide the desired spacing.
- the roll dies and shims may be fixedly clamped to arbor 29 by arbor end bolts 31.
- Each die is a hardened annular disk having an appropriate rounded profile at the periphery thereof for rolling a groove into tubular blank 12. It should be noted particularly that the dies A,, A A A A A A and A generally progressively increase in pitch from front to rear as well as in thickness and external diameter. The reasons for this progressive increase in pitch between the dies on arbor 29 from front to rear will be more clearly set forth hereinafter in connection with the operation of the tube finning apparatus.
- Roll assembly B shown in cross section in the lower portion of FIG. 1 includes an arbor 32 having journals at the front and rear ends thereof in another pair of bearings 28 and 35.
- a plurality of roll dies B,, B B B B B B and B, respectively are disposed from front to rear on arbor 32.
- a plurality of annular spacer shims 33 may be disposed between the roll dies to provide the desired spacing.
- the roll dies and shims may be fixedly clamped to arbor 32 by arbor end bolts 34.
- Each die on roll assembly B also is a hardened annular disk having an appropriate rounded profile at the periphery thereof for rolling a groove into tubular blank 12. It should be noted particularly that the dies B,, B B B B B B and B progressively increase in pitch from front to rear as well as in thickness and external diameter. The reasons for the progressive increase in pitch between the dies on arbor 32 from front to rear will be more clearly set forth hereinafter in connection with the operation of the tube finning apparatus.
- roll assemblies A, B, C, and D are angled slightly so as to follow a helical path relative to tube 12. This is accomplished by rotatably advancing rear support bars 22 somewhat ahead of front support bars 21 in the direction of the rotation of head 13 relative to the direction of tubular blank 12.-This relative rotational adjustment of support bars 22 relative to support bars 21 may be accomplished by loosening the bolts 17 or 19 and loosening the set screws 25.
- the forward annular plate 15 may be rotated in slots 16 and/or the rearward annular plate 18 may be rotated in slots 20 to the desired degree after which said bolts and set screws may be retightened as aforedescribed.
- Support bars 21 and 22 will be slightly rotated in bores 23 and 24 during this adjustment.
- FIG. 1 the sectional view of FIG. 1 is not precisely taken as where indicated in FIG. 2 for purposes of simplicity.
- the section of FIG. 1 views the roll assemblies A and B along a plane passing through the axes thereof, i.e., the axes of arbors 29 and 32.
- dies of roll assembly B are axially disposed somewhat behind the respective dies of roll A.
- die B is disposed somewhat behind die A,, die B somewhat behind die A, and so on.
- dies or roll assembly D are disposed axially behind the respective dies of roll C.
- each horizontal line represents a roll assembly.
- the position of the roll dies on each roll assembly is indicated by the intersection of the horizontal line and a oblique line.
- the bottom horizontal line represents roll assembly A having dies A,, A A A A A and A,,, as indicated by the intersections of the oblique lines with the bottom horizontal line.
- the second, third and fourth horizontal lines from the bottom of 1 represent the die positions on roll assemblies B, C
- the other groove is formed by the procession of dies C,, D,, A B C D A B C D A B C-,, D,, A and B
- the general curvature of the oblique lines on the diagram as constructed is entirely due to the change in pitch between adjacent dies both along the roll assembly arbors and along the groove path as the diagram does not take into consideration the change in helix angle due to the progressively reduced diameter of the groove.
- the tube is fed axially relative to the groove forming head 13 as indicated by the vectors in FIG. 1.
- the mandrel 11 may previously have been inserted in and carried along with the tubular blank 12, or it may be supported in axially fixed relationship with the groove forming head 13.
- the groove forming head is rotatably driven relative to the tubular blank 12 as indicated by the vectors in FIG. 2. Due to the inclination of the arbors of roll assemblies A, B, C and D, the groove forming head 13 drives itself axially relative to tubular blank 12 as indicated by the vectors in FIG. 1. It will be seen from FIG.
- double lead thread having a thread density of 35% fins per
- A, and C 0.0000 inches B, and D, 0.0120 inches A, and C, 0.0240 inches B and D, 0.0365 inches A and C, 0.0490 inches B; and D,, 0.0615 inches A, and C. 0.0745 inches B, and D, 0.0875 inches A, and C, 0.1010 inches B, and D, 0.1150 inches A, and C 0.1290 inches B, and D, 0.1430 inches A, and C, 0.1575 inches B, and D 0.1715 inches A and C, 0.1860 inches B, and D, 0.2000 inches
- the pitch between successive adjacent dies on roll assemblies A and C from front to rear was thus as follows:
- the amount of elongation will be depended upon a number of factors including the tubular blank dimensions of diameter and wall thickness, the tubular blank material, the final fin spacing, the final fin height, and the final tube diameter. With a reasonable amount of experience it is possible to predict to some degree of accuracy the amount of expected tube elongation for a desired finned tube configuration. Once the tube elongation is known, it is then possible to space the roll dies in such a manner as to provide for the change in pitch therebetween as herein disclosed.
- fin densities of 35 fins per inch and more may be achieved without excessive die breakage of fin deformation.
- Apparatus for forming a helical finned tube comprising; means for supporting an elongated tubular blank; means for initially forming a shallow helical groove in the surface of the tube blank, and die means including work engaging portions for simultaneously changing the depth and pitch of said groove to accommodate changes of length of the tubular blank in the vicinity of engagement with said die means.
- apparatus for forming an integral helical fin on an elongated tubular blank including, a mandrel means for internally supporting said tubular blank, means for rolling a helical groove into the outer surface of said tubular blank having at least three roll assemblies circumferentially arranged about said tubular blank, each roll assembly having a plurality of axially spaced roll dies adapted to rollingly engage the exterior surface of said tubular blank, the improvement wherein the pitch between the dies on separate roll assemblies and proceeding in a single groove in the outer surface of said tubular blank generally increases from the leading end toward the training end of the procession of dies in said single groove to accommodate elongation of said tubular blank in the vicinity of engagement with said roll assemblies.
- apparatus for forming an integral helical fin on an elongated tubular blank including, a mandrel means for internally supporting said tubular blank, means for rolling a helical groove into the outer surface of said tubular blank having at least three roll assemblies circumferentially arranged about said tubular blank, each roll assembly having a plurality ofaxially spaced roll dies adapted to rollingly engage the exterior surface of said tubular blank, the improvement wherein the pitch between the dies on each roll assembly generally increases from the leading end toward the trailing end of the roll assembly to accommodate elongation of said tubular blank in the vicinity of engagement with said roll assemblies.
- apparatus for forming an integral helical fin on an elongated tubular blank including, a mandrel means for internally supporting said tubular blank, means for rolling a helical groove into the outer surface of said tubular blank having at least three roll assemblies circumferentially arranged about said tubular blank, each roll assembly having a plurality of axia ll y s paced r oll dies adapted to rollingly engage the exterior surface of said Ebular blank, the improvement wherein the leading die of one roll assembly is displaced forwardly of the leading die of another roll assembly and the average pitch between the dies of said one roll assembly is less than the average pitch between the dies of said other roll assembly to thereby accommodate elongation of said. tubular blank in the vicinity of engagement with said roll assemblies.
- apparatus for forming an integral helical fin on an elongated tubular blank including, a mandrel. means for internally supporting said tubular blank, means for rolling a helical groove into the outer surface of said tubular blank having at least three roll assemblies circumferentially arranged about said tubular blank, each roll assembly having a plurality of axially spaced roll dies adapted to rollingly engage the exterior surface of said tubular blank, the improvement wherein the average pitch between the dies in the forward half of each of said roll assemblies is less than the average pitch between the dies in the rear half of each of said roll assemblies to accommodate elongation of the tubular blank in the vicinity of engagement with said roll assemblies.
- apparatus for forming an integral helical fin on an elongated tubular blank including, a mandrel means for internally supporting said tubular blank, means for rolling a helical groove into the outer surface of said tubular blank having at least three roll assemblies circumferentially arranged about said tubular blank, each roll assembly having a plurality of axially spaced roll dies adapted to rollingly engage the exterior surface of said tubular blank, the improvement wherein the pitch between the dies on separate roll assemblies and proceeding in a single groove in the outer surface of said tubular blank differs to accommodate changes in length of the tubular blank in the vicinity of engagement with said roll assemblies.
- apparatus for forming an integral helical fin on an elongated tubular blank including, a mandrel means for internally supporting said tubular blank, means for rolling a helical groove into the outer surface of said tubular blank having at least three roll assemblies circumferentially arranged about said tubular blank, each roll assembly having a plurality of axially spaced roll dies adapted to rollingly engage the exterior surface of said tubular blank, the improvement wherein the pitch between the dies of one roll assembly differs from the pitch between the dies of another adjacent roll assembly to accomrnodate changes in length of the tubular blank in the vicinity of engagement with said roll assemblies.
- a method of forming an integrally finned heat exchanger tube comprising the steps of: providing an elongated tubular blank of substantially circular cross section; supporting the internal surface of said tubular blank; and passing along a helical path relative to said tubular blank a series of fin extruding dies in engagement with the exterior surface of said tubular blank wherein the center of the areas of engagement lie substantially along a helicoidal path of decreasing diameter and increasing pitch to accommodate for elongation of said tubular blank in the vicinity of engagement with said dies wherein said axis of said helicoidal path is substantially coaxial with the axes of said helical path and said tubular blank.
- a method of forming an integrally finned heat exchanger tube comprising the steps of: providing an elongated tubular blank of substantially circular cross section; supporting the internal surface of said tubular blank; and passing along a helical path relative to said tubular blank a series of roll dies in rolling engagement with the exterior surface of said tubular blank wherein the center of the areas of engagement lie substantially along a helicoidal path of decreasing diameter and increasing pitch to accommodate for elongation of said tubular blank in the vicinity of engagement with said dies wherein said axis of said helicoidal path is substantially coaxial with the axes of said helical path and said tubular blank.
- a method of forming an integrally finned heat exchanger tube comprising the steps of: providing an elongated tubular blank of substantially circular cross section; supporting the internal surface of said tubular blank, and passing along a helical path relatTve to said tubular blank a series of fin extruding dies in engagement with the exterior surface of said tubular blank wherein the center of the areas of engagement lie substantially along a helicoidal path of changing diameter and pitch to accommodate changes in the length of said tubular blank in the vicinity of engagement with said dies wherein the axis of said helicoidal path is substantially coaxial with the axes of said helical path and said tubular blank.
- a method of forming an integrally finned heat exchanger tube comprising the steps of: providing an elongated tubular blank of substantially circular cross section; supporting said tubular blank; and passing along a helical path relative to said tubular blank a series of fin extruding dies in engagement with the surface of said tubular blank wherein the centers of the areas of engagement lie substantially along a' helicoidal path of changing diameter and pitch commensurate with changes in the length of said tubular blank in the vicinity of engagement with said dies wherein the axis of said helicoidal path is substantially coaxial with the axes of said helical path and said tubular blank.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Extraction Processes (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
Description
Claims (14)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US1627470A | 1970-03-04 | 1970-03-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3648502A true US3648502A (en) | 1972-03-14 |
Family
ID=21776294
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16274A Expired - Lifetime US3648502A (en) | 1970-03-04 | 1970-03-04 | Method and apparatus for forming a heat exchanger tube with closely spaced integral fins |
Country Status (6)
Country | Link |
---|---|
US (1) | US3648502A (en) |
JP (1) | JPS5598447U (en) |
CA (1) | CA942545A (en) |
DE (1) | DE2110485C3 (en) |
FR (1) | FR2084158A5 (en) |
GB (1) | GB1302335A (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3795125A (en) * | 1972-01-27 | 1974-03-05 | Universal Oil Prod Co | High-fin integral finned tube of heat-resisting alloys, and multi-pass process for making the same |
US4043161A (en) * | 1975-11-07 | 1977-08-23 | Astrolab, Inc. | Apparatus for forming corrugations of "zero" pitch in coaxial cable |
US4100784A (en) * | 1976-08-09 | 1978-07-18 | Heat Exchangers Africa Limited | Finned tubing |
US4215559A (en) * | 1978-02-06 | 1980-08-05 | Kabel-Und Metallwerke Gutehoffnungshuette Ag | Corrugation apparatus |
US4299106A (en) * | 1978-09-22 | 1981-11-10 | Heat Exchangers Africa Limited | Finned tubing |
US4901553A (en) * | 1987-06-03 | 1990-02-20 | Sumitomo Metal Industries, Ltd. | Method of manufacturing a finned tube |
US5365763A (en) * | 1992-05-06 | 1994-11-22 | Escofier Technologie Sa | Device for shaping of helical fins on the outer wall of a tube |
US5417095A (en) * | 1993-11-08 | 1995-05-23 | C.J. Winter Machine Works, Inc. | Thread rolling attachment and method |
EP1114681A1 (en) * | 1998-03-31 | 2001-07-11 | Showa Denko K K | Work roll for rolling device |
US6382311B1 (en) | 1999-03-09 | 2002-05-07 | American Standard International Inc. | Nucleate boiling surface |
US6427767B1 (en) | 1997-02-26 | 2002-08-06 | American Standard International Inc. | Nucleate boiling surface |
US6739167B2 (en) | 1998-03-31 | 2004-05-25 | Showa Denko K.K. | Work roll for use in rolling apparatus |
CN103191979A (en) * | 2013-03-27 | 2013-07-10 | 金龙精密铜管集团股份有限公司 | Combined cutting tool for processing finned tube |
US11370186B2 (en) * | 2016-04-13 | 2022-06-28 | Kongsberg Actuation Systems Ltd. | Method and apparatus for forming a corrugated fluoropolymer tube |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL8203928A (en) * | 1981-11-23 | 1983-06-16 | Wieland Werke Ag | TUBE FOR TRANSMISSION OF HEAT WITH LEAKAGE INDICATION. |
GB2146930B (en) * | 1983-09-24 | 1987-04-23 | Eschweiler Bergwerksverein | A planetary skew-rolling mill |
DE4420756C1 (en) | 1994-06-15 | 1995-11-30 | Wieland Werke Ag | Ribbed heat exchanger tube |
FR2836649B1 (en) * | 2002-03-01 | 2006-05-26 | Inst Francais Du Petrole | TOOL COMPRISING STACKED PLATES FOR PRINTING GROOVES ON DEFORMABLE MATERIAL |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2508517A (en) * | 1945-10-01 | 1950-05-23 | Calumet And Hecla Cons Copper | Method of forming integral fins on tubing |
US2779223A (en) * | 1955-08-24 | 1957-01-29 | Herman A Schuster | Apparatus for forming fins |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE669560A (en) * | 1964-12-28 |
-
1970
- 1970-03-04 US US16274A patent/US3648502A/en not_active Expired - Lifetime
-
1971
- 1971-02-01 CA CA104,093A patent/CA942545A/en not_active Expired
- 1971-03-02 DE DE2110485A patent/DE2110485C3/en not_active Expired
- 1971-03-03 FR FR7107372A patent/FR2084158A5/fr not_active Expired
- 1971-04-19 GB GB2446771*A patent/GB1302335A/en not_active Expired
-
1980
- 1980-01-22 JP JP1980005487U patent/JPS5598447U/ja active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2508517A (en) * | 1945-10-01 | 1950-05-23 | Calumet And Hecla Cons Copper | Method of forming integral fins on tubing |
US2779223A (en) * | 1955-08-24 | 1957-01-29 | Herman A Schuster | Apparatus for forming fins |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3795125A (en) * | 1972-01-27 | 1974-03-05 | Universal Oil Prod Co | High-fin integral finned tube of heat-resisting alloys, and multi-pass process for making the same |
US4043161A (en) * | 1975-11-07 | 1977-08-23 | Astrolab, Inc. | Apparatus for forming corrugations of "zero" pitch in coaxial cable |
US4100784A (en) * | 1976-08-09 | 1978-07-18 | Heat Exchangers Africa Limited | Finned tubing |
US4215559A (en) * | 1978-02-06 | 1980-08-05 | Kabel-Und Metallwerke Gutehoffnungshuette Ag | Corrugation apparatus |
US4299106A (en) * | 1978-09-22 | 1981-11-10 | Heat Exchangers Africa Limited | Finned tubing |
US4901553A (en) * | 1987-06-03 | 1990-02-20 | Sumitomo Metal Industries, Ltd. | Method of manufacturing a finned tube |
US4959985A (en) * | 1987-06-03 | 1990-10-02 | Sumitomo Metal Industries Ltd. | Method of manufacturing metallic tube with spiral fin |
US5365763A (en) * | 1992-05-06 | 1994-11-22 | Escofier Technologie Sa | Device for shaping of helical fins on the outer wall of a tube |
US5417095A (en) * | 1993-11-08 | 1995-05-23 | C.J. Winter Machine Works, Inc. | Thread rolling attachment and method |
US6427767B1 (en) | 1997-02-26 | 2002-08-06 | American Standard International Inc. | Nucleate boiling surface |
EP1114681A1 (en) * | 1998-03-31 | 2001-07-11 | Showa Denko K K | Work roll for rolling device |
EP1114681A4 (en) * | 1998-03-31 | 2003-06-11 | Showa Denko Kk | Work roll for rolling device |
US6739167B2 (en) | 1998-03-31 | 2004-05-25 | Showa Denko K.K. | Work roll for use in rolling apparatus |
US6382311B1 (en) | 1999-03-09 | 2002-05-07 | American Standard International Inc. | Nucleate boiling surface |
CN103191979A (en) * | 2013-03-27 | 2013-07-10 | 金龙精密铜管集团股份有限公司 | Combined cutting tool for processing finned tube |
CN103191979B (en) * | 2013-03-27 | 2015-04-01 | 金龙精密铜管集团股份有限公司 | Combined cutting tool for processing finned tube |
US11370186B2 (en) * | 2016-04-13 | 2022-06-28 | Kongsberg Actuation Systems Ltd. | Method and apparatus for forming a corrugated fluoropolymer tube |
Also Published As
Publication number | Publication date |
---|---|
JPS5598447U (en) | 1980-07-09 |
DE2110485A1 (en) | 1971-09-16 |
FR2084158A5 (en) | 1971-12-17 |
DE2110485C3 (en) | 1981-05-27 |
DE2110485B2 (en) | 1980-06-19 |
CA942545A (en) | 1974-02-26 |
GB1302335A (en) | 1973-01-10 |
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Legal Events
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AS | Assignment |
Owner name: TRANE COMPANY, THE Free format text: MERGER;ASSIGNOR:A-S CAPITAL INC. A CORP OF DE;REEL/FRAME:004334/0523 |
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Owner name: TRANE COMPANY THE Free format text: MERGER;ASSIGNORS:TRANE COMPANY THE, A CORP OF WI (INTO);A-S CAPITAL INC., A CORP OF DE (CHANGED TO);REEL/FRAME:004372/0370 Effective date: 19840224 Owner name: AMERICAN STANDARD INC., A CORP OF DE Free format text: MERGER;ASSIGNORS:TRANE COMPANY, THE;A-S SALEM INC., A CORP. OF DE (MERGED INTO);REEL/FRAME:004372/0349 Effective date: 19841226 |
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Owner name: A-S CAPITAL INC., A CORP OF DE Free format text: MERGER;ASSIGNOR:TRANE COMPANY THE A WI CORP;REEL/FRAME:004432/0765 Effective date: 19840224 |
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Owner name: BANKERS TRUST COMPANY, NEW YORK Free format text: SECURITY INTEREST;ASSIGNOR:TRANE AIR CONDITIONING COMPANY, A DE CORP.;REEL/FRAME:004905/0213 Effective date: 19880624 Owner name: BANKERS TRUST COMPANY, 4 ALBANY STREET, 9TH FLOOR, Free format text: SECURITY INTEREST;ASSIGNOR:TRANE AIR CONDITIONING COMPANY, A DE CORP.;REEL/FRAME:004905/0213 Effective date: 19880624 Owner name: BANKERS TRUST COMPANY Free format text: SECURITY INTEREST;ASSIGNOR:AMERICAN STANDARD INC., A DE. CORP.,;REEL/FRAME:004905/0035 Effective date: 19880624 |
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Owner name: CHEMICAL BANK, AS COLLATERAL AGENT, NEW YORK Free format text: ASSIGNMENT OF SECURITY INTEREST;ASSIGNOR:BANKERS TRUST COMPANY, AS COLLATERAL TRUSTEE;REEL/FRAME:006565/0753 Effective date: 19930601 |
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Owner name: AMERICAN STANDARD, INC., NEW JERSEY Free format text: RELEASE OF SECURITY INTEREST (RE-RECORD TO CORRECT DUPLICATES SUBMITTED BY CUSTOMER. THE NEW SCHEDULE CHANGES THE TOTAL NUMBER OF PROPERTY NUMBERS INVOLVED FROM 1133 TO 794. THIS RELEASE OF SECURITY INTEREST WAS PREVIOUSLY RECORDED AT REEL 8869, FRAME 0001.);ASSIGNOR:CHASE MANHATTAN BANK, THE (FORMERLY KNOWN AS CHEMICAL BANK);REEL/FRAME:009123/0300 Effective date: 19970801 |
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Owner name: AMERICAN STANDARD, INC., NEW JERSEY Free format text: RELEASE OF SECURITY INTEREST;ASSIGNOR:CHASE MANHATTAN BANK, THE (FORMERLY KNOWN AS CHEMICAL BANK);REEL/FRAME:008869/0001 Effective date: 19970801 |