US3630062A - Method of manufacturing fin metal tubing - Google Patents

Method of manufacturing fin metal tubing Download PDF

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Publication number
US3630062A
US3630062A US840249A US3630062DA US3630062A US 3630062 A US3630062 A US 3630062A US 840249 A US840249 A US 840249A US 3630062D A US3630062D A US 3630062DA US 3630062 A US3630062 A US 3630062A
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US
United States
Prior art keywords
tubing
intermediate tubing
cross
section
fins
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
Application number
US840249A
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English (en)
Inventor
Masaharu Odaki
Takashi Konno
Tatsuya Mochizuki
Osamu Nakahara
Makoto Hashimoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Engineering Corp
Original Assignee
Nippon Kokan Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Kokan Ltd filed Critical Nippon Kokan Ltd
Application granted granted Critical
Publication of US3630062A publication Critical patent/US3630062A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

  • Keenan Attorney-Flynn & Frishauf ABSTRACT An ordinary cylindrical metal tube is formed into an intermediate tubing having thicker wall portions at which fins are to be formed subsequently, and the intermediate tubing is then subjected to a cold drawing operation by using a finlike die and a cylindrical plug so as to form fins from the thicker wall portions.
  • FIG IO B) FIG. IO (A) BACKGROUND OF THE INVENTION
  • This invention relates to a method of manufacturing fin metal tubing and more particularly to an improved method of cold drawing from hot-rolled tubing with special plug.
  • the method utilizing a hot extrusion machine and the method utilizing a plug mill are not always satisfactory in that the dimensional accuracy and surface quality of the products are not uniform.
  • the method (3) wherein fin tubing produced by either method 1) or (2) are further subjected to the cold drawing operation can provide products of excellent quality or having excellent dimensional accuracy and improved inner and outer surface finish, this two step method increases the cost of manufacturing.
  • the heat of welding affects the metallurgical or physical properties of the tube.
  • a fin tubing 2 as shown in FIG. 1A may be manufactured by cold drawing an ordinary cylindrical metal tube 3 shown in FIG. 13 with a die 5 having grooves 4 corresponding to fins 1 (see FIG. 1C) and a cooperating cylindrical plug, not shown. It is, however, well known that there is formed some depressions 6 at the opposite wall of each fin formed by the above prior art method, as shown in FIG. 1D.
  • an ordinary cylindrical metal tube is formed into an intermediate tubing having thicker wall portions at which fins are to be formed subsequently, and the intermediate tubing is then subjected to a cold drawing operation by using a finlike die and a cylindrical plug so as to form fins from said thicker wall portions.
  • FIG. IA is a cross-sectional view of a fin metal tubing
  • FIG. 1B shows a cross section of a circular tube
  • FIG. 1C shows a cross section of a finlike die utilized to manufacture a fin tubing from the cylindrical tube shown in FIG. 1A;
  • FIG. 1D shows a cross section of a prior art fin tubing produced by utilizing the finlike die shown in FIG. 1C and the tube shown in FIG. 18;
  • FIG. 2 shows a longitudinal sectional view of the apparatus employed in the first step of the cold drawing process embodying this invention
  • FIG. 3 shows a cross section taken along a line III-III IN FIG. 2;
  • FIG. 4 shows a cross section of an intermediate tubing
  • FIG. 5 shows a longitudinal sectional view of the apparatus utilized in the second step of this invention
  • FIG. 6 shows a cross section taken along a line VIVI in FIG. 5;
  • FIGS. 7(A), 7(B), 8(A), 8(8) and 9(A), 9(B) show cross sections of the intermediate product and of the final product of a modified embodiment and;
  • FIGS. 10(A) through (.C) show a sectional view to illustrate typical dimensions of the product.
  • DETAILED DESCRIP- TION OF THE PREFERRED EMBODIMENTS in accordance with this invention, to provide a fin metal tubing 2 as shown in FIG. I, an ordinary cylindrical metal tube 3 as shown in FIG. 1B is subjected to a cold drawing operation by utilizing a plug 7 having rectangular or elliptical cross section as shown in FIGS. 2 and 3 and a die 8 of circular cross section, instead of a plug of circular cross section, so as to obtain an intermediate tubing 9 having a nonuniform wall thickness. As shown in FIG. 4, the tubing 9 has thicker wall portions 10 which are to be utilized to form fins as described later.
  • the tubing 9 is then utilized as an intermediate tubing and subjected to a cold drawing operation by employing a finlike die 5 having a required configuration as shown in FIG. 1C, for example, and a cylindrical plug 11, as shown in FIG. 5 so as to readily produce a fin tubing as shown in FIG. 1A which is free from any internal depressions (see FIG. ID).
  • FIG. 7B shows a cross section of a fin metal tubing having four equally spaced-apart radial fins and FIG. 7A shows an intermediate tubing to obtain this product.
  • FIG. 8B shows a cross section of a modified fin metal tubing having two spaced-apart radial fins and FIG. 8A shows a cross section of an intermediate tubing suitable for producing the product shown in FIG. 88.
  • FIG. 9 shows a cross section of a modified intermediate tubing in which diametrically opposing portions thereof corresponding to the fins of the finished products are bulged radially inwardly as well as outwardly.
  • FIG. 10 illustrates typical dimensions of a mother tube A, an intermediate tube B after the first step and a product C after the second step. These dimensions are:
  • a less expensive ordinary cylindrical tube is utilized as a mother tube.
  • the mother tube is subjected to a special deformation step by means of which portions of an intermediate tube, at which fins are to be formed subsequently, are thickened.
  • the forming flow of the material at the fins is enhanced. It is possible to provide, with ease, a fin metal tubing free from internal depressions and having accurate configuration and dimensional accuracies as well as excellent surface finish.
  • the manufacturing cost of using this invention is low because the cost of the starting material is low and because a conventional cold drawing machine can be used.
  • this invention can also provide some fin metal tubings having radial fins directed in a number of directions, having one-side twodirection fins or having many other configurations, which is suitable for use in boilers and for structural purposes. Further, it is to be understood that intermediate tubing can also be readily manufactured by a cold pilger roll and the like.
  • a method of manufacturing a fin metal tubing comprising forming an intermediate tubing from a cylindrical metal tube, said intermediate tubing having thicker wall portions at the locations corresponding to where fins are to be formed in a subsequent step;

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Extraction Processes (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
US840249A 1968-07-13 1969-07-09 Method of manufacturing fin metal tubing Expired - Lifetime US3630062A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP43048845A JPS4834664B1 (xx) 1968-07-13 1968-07-13

Publications (1)

Publication Number Publication Date
US3630062A true US3630062A (en) 1971-12-28

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ID=12814577

Family Applications (1)

Application Number Title Priority Date Filing Date
US840249A Expired - Lifetime US3630062A (en) 1968-07-13 1969-07-09 Method of manufacturing fin metal tubing

Country Status (6)

Country Link
US (1) US3630062A (xx)
JP (1) JPS4834664B1 (xx)
DE (1) DE1935357C3 (xx)
FR (1) FR2012924A1 (xx)
GB (1) GB1240380A (xx)
SE (1) SE366668B (xx)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4622840A (en) * 1983-06-20 1986-11-18 Neapco, Inc. Method for drawing telescoping tubes for torque transmission
US5036693A (en) * 1988-04-15 1991-08-06 Babcock Energy Limited Integral finned tubes and a method of manufacturing same
US6253452B1 (en) * 1999-11-23 2001-07-03 Hsin-Yi Chen Method for manufacturing cylindrical radiator
WO2022016710A1 (zh) * 2020-07-24 2022-01-27 浙江久立特材科技股份有限公司 一种带肋包壳管的冷拔模具、生产工艺及其成品管

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63154058U (xx) * 1987-03-30 1988-10-11
WO1993023183A1 (en) * 1992-05-18 1993-11-25 Norsk Hydro A.S Method of manufacturing tubular member having integral exterior protrusions

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE623313A (xx) *
US721209A (en) * 1901-10-07 1903-02-24 Max Mannesmann Art of rolling tubes.
US3327513A (en) * 1965-02-12 1967-06-27 John W Hinshaw Method and apparatus for working metal

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE623313A (xx) *
US721209A (en) * 1901-10-07 1903-02-24 Max Mannesmann Art of rolling tubes.
US3327513A (en) * 1965-02-12 1967-06-27 John W Hinshaw Method and apparatus for working metal

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4622840A (en) * 1983-06-20 1986-11-18 Neapco, Inc. Method for drawing telescoping tubes for torque transmission
US5036693A (en) * 1988-04-15 1991-08-06 Babcock Energy Limited Integral finned tubes and a method of manufacturing same
US6253452B1 (en) * 1999-11-23 2001-07-03 Hsin-Yi Chen Method for manufacturing cylindrical radiator
WO2022016710A1 (zh) * 2020-07-24 2022-01-27 浙江久立特材科技股份有限公司 一种带肋包壳管的冷拔模具、生产工艺及其成品管

Also Published As

Publication number Publication date
JPS4834664B1 (xx) 1973-10-23
DE1935357C3 (de) 1980-11-13
DE1935357B2 (de) 1980-03-20
GB1240380A (en) 1971-07-21
DE1935357A1 (de) 1970-10-29
SE366668B (xx) 1974-05-06
FR2012924A1 (xx) 1970-03-27

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