US20130298632A1 - Expansion bullet for heat exchanger tube - Google Patents

Expansion bullet for heat exchanger tube Download PDF

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Publication number
US20130298632A1
US20130298632A1 US13/981,114 US201213981114A US2013298632A1 US 20130298632 A1 US20130298632 A1 US 20130298632A1 US 201213981114 A US201213981114 A US 201213981114A US 2013298632 A1 US2013298632 A1 US 2013298632A1
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US
United States
Prior art keywords
bullet
expansion
edge face
tube
leading edge
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
Application number
US13/981,114
Inventor
Eric Konkle
James H. Woodard
Jason Michael Thomas
Loren D. Hoffman
Jeffrey L. Jones
Luis Felipe Avila
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.)
Carrier Corp
Original Assignee
Carrier Corp
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 Carrier Corp filed Critical Carrier Corp
Priority to US13/981,114 priority Critical patent/US20130298632A1/en
Assigned to CARRIER CORPORATION reassignment CARRIER CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WOODARD, James H., HOFFMAN, LOREN D., JONES, JEFFREY L., THOMAS, JASON MICHAEL, AVILA, LUIS FELIPE, KONKLE, ERIC
Assigned to CARRIER CORPORATION reassignment CARRIER CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WOODARD, James H., HOFFMAN, LOREN D., JONES, JEFFREY L., THOMAS, JASON MICHAEL, AVILA, LUIS FELIPE, KONKLE, ERIC
Publication of US20130298632A1 publication Critical patent/US20130298632A1/en
Abandoned legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D41/00Application of procedures in order to alter the diameter of tube ends
    • B21D41/02Enlarging
    • B21D41/026Enlarging by means of mandrels
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/08Tube expanders
    • B21D39/20Tube expanders with mandrels, e.g. expandable
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00Making other particular articles
    • B21D53/02Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
    • B21D53/08Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of both metal tubes and sheet metal
    • B21D53/085Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of both metal tubes and sheet metal with fins places on zig-zag tubes or parallel tubes

Definitions

  • the subject matter disclosed herein relates to heat exchanger tubes. More specifically, the subject disclosure relates to expansion bullets for manufacturing heat exchanger tubes.
  • Heat exchangers of, for example, air conditioners include a plurality of heat exchanger fins and a plurality of heat exchanger tubes.
  • the tubes are passed through holes in the fins, then are expanded to force the tubes into interference fit with the fins, thereby securing the tubes in place relative to the fins.
  • the tubes are expanded via a bullet having a maximum diameter the same as that of the desired final inner diameter of the tube.
  • the bullet 100 is fixed to a mandrel for inserting into the tube, and typically has a radiused leading edge 102 and a conical or cylindrical body 104 .
  • the typical cross-sectional shape of an expansion bullet requires application of a high force in order for the bullet to successfully expand the tube. Further, especially when expanding aluminum tubes, aluminum material builds up on the bullet, resulting in galling and further increase in the necessary applied force.
  • an expansion bullet for a heat exchanger tube includes a leading edge face, a trailing edge face, and a bullet body insertable into a tube of a heat exchanger to expand the tube.
  • the bullet body extends from the leading edge face to the trailing edge face and has an outer profile defined by a single radius.
  • an expansion mechanism for a tube of heat exchanger includes a bullet driving device and an expansion bullet driveable by the bullet driving device.
  • the expansion bullet includes a leading edge face, a trailing edge face, and a bullet body insertable into a tube of a heat exchanger to expand the tube.
  • the bullet body extends from the leading edge face to the trailing edge face and has an outer profile defined by a single radius.
  • FIG. 1 is a cross-sectional view of an embodiment of a tube expansion bullet
  • FIG. 2 is another cross-sectional view of an embodiment of an expansion bullet.
  • FIG. 3 is a cross-sectional view of a typical expansion bullet.
  • FIG. 1 Shown in FIG. 1 is a schematic of an expansion mechanism 10 for a tube 12 of, for example, a heat exchanger.
  • the illustrated tube 12 is formed of an aluminum material, but other materials, for example, copper, may be utilized.
  • the mechanism 10 includes a mandrel 14 which supports an expansion bullet 16 .
  • the expansion bullet 16 has a maximum diameter 18 greater than an unexpanded diameter 20 of the tube 12 .
  • the mandrel 14 and bullet 16 are driven into the tube 12 to expand the tube 12 to an inner diameter substantially equal to the maximum diameter 18 of the bullet 16 .
  • expansion utilizing a mandrel 14 to drive the bullet 16 is shown in FIG. 1 and described herein, it is merely exemplary. It is to be appreciated that other bullet 16 driving means, such as a fluid applied to the bullet 16 , are contemplated within the present scope.
  • the bullet 16 has a specific cross-sectional shape, as shown in FIG. 2 .
  • the bullet 16 is substantially symmetrical about a bullet axis 22 extending along a length 24 of the bullet 16 .
  • the bullet 16 has an inner diameter 26 defining a bullet opening 28 for mounting the bullet on the mandrel 14 .
  • the bullet has a leading edge face 30 and a trailing edge face 32 which are substantially planar and perpendicular to the bullet axis 22 , and a bullet body 34 extending the length of the bullet 16 between the leading edge face 30 and the trailing edge face 32 .
  • a surface profile of the bullet body 34 is a single continuous radius 36 . While a single continuous radius is shown in FIG. 2 , it is to be appreciated that other configurations to reduce friction may be utilized.
  • the radius 36 may be interrupted along its length by on or more chamfers or steps.
  • a center point 38 of the continuous radius 36 is shown in FIG. 2 .
  • an axial position of the center point 38 is biased toward the trailing edge face 32 such that, a leading edge face diameter 40 is less than a trailing edge face diameter 42 .
  • the center point 38 is located along the length of the bullet 16 between about 1 ⁇ 4 and 1 ⁇ 3 of the distance from the trailing edge face 32 to the leading edge face 30 .
  • the center point 38 is offset radially from the bullet axis 22 .
  • the center point 38 may be located outside of the bullet 16 .
  • a bullet 16 utilized to expand a tube 12 having about a 3 ⁇ 8′′ outer diameter 44 is shown in FIG. 2 .
  • the leading edge face diameter 40 is about 0.188 inches and the trailing edge diameter 42 is about 0.321 inches.
  • the continuous radius 36 of the bullet 16 is about 0.350 inches.
  • the continuous radius 36 is substantially proportional to the outer diameter 44 (shown in FIG. 1 ) of the tube 12 to be expanded. For larger outer diameters 44 a larger radius 36 is utilized, while for a smaller outer diameter 44 , a bullet 16 having a smaller radius 36 is utilized.
  • the bullet opening 28 is chamfered at the leading edge face 30 and the trailing edge face 32 to ease installation of the bullet 16 on the mandrel 14 .
  • the bullet 16 is formed from a steel material, for example, tool steel. It is to be appreciated, however, that other suitable materials may be utilized and are contemplated within the present scope.
  • the bullet 16 may include a coating material applied to the bullet 16 .
  • This coating may be, for example, a metallic coating, a plastic coating, a nano coating, and/or a surface treatment, or the like to reduce friction and galling, add wear resistance, and/or increase corrosion resistance.
  • the coating is a hard chrome plating.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

An expansion bullet for a heat exchanger tube includes a leading edge face, a trailing edge face, and a bullet body insertable into a tube of a heat exchanger to expand the tube. The bullet body extends from the leading edge face to the trailing edge face and has an outer profile defined by a single radius. An expansion mechanism for a tube of heat exchanger includes a bullet driving device and an expansion bullet drivable by the bullet driving device. The expansion bullet includes a leading edge face, a trailing edge face, and a bullet body insertable into a tube of a heat exchanger to expand the tube. The bullet body extends from the leading edge face to the trailing edge face and has an outer profile defined by a single radius.

Description

    BACKGROUND OF THE INVENTION
  • The subject matter disclosed herein relates to heat exchanger tubes. More specifically, the subject disclosure relates to expansion bullets for manufacturing heat exchanger tubes.
  • Heat exchangers of, for example, air conditioners, include a plurality of heat exchanger fins and a plurality of heat exchanger tubes. The tubes are passed through holes in the fins, then are expanded to force the tubes into interference fit with the fins, thereby securing the tubes in place relative to the fins. Typically, the tubes are expanded via a bullet having a maximum diameter the same as that of the desired final inner diameter of the tube. The bullet 100, an example of which is shown in FIG. 3, is fixed to a mandrel for inserting into the tube, and typically has a radiused leading edge 102 and a conical or cylindrical body 104. The typical cross-sectional shape of an expansion bullet requires application of a high force in order for the bullet to successfully expand the tube. Further, especially when expanding aluminum tubes, aluminum material builds up on the bullet, resulting in galling and further increase in the necessary applied force.
  • BRIEF DESCRIPTION OF THE INVENTION
  • According to one aspect of the invention, an expansion bullet for a heat exchanger tube includes a leading edge face, a trailing edge face, and a bullet body insertable into a tube of a heat exchanger to expand the tube. The bullet body extends from the leading edge face to the trailing edge face and has an outer profile defined by a single radius.
  • According to another aspect of the invention, an expansion mechanism for a tube of heat exchanger includes a bullet driving device and an expansion bullet driveable by the bullet driving device. The expansion bullet includes a leading edge face, a trailing edge face, and a bullet body insertable into a tube of a heat exchanger to expand the tube. The bullet body extends from the leading edge face to the trailing edge face and has an outer profile defined by a single radius.
  • These and other advantages and features will become more apparent from the following description taken in conjunction with the drawings.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • The subject matter, which is regarded as the invention, is particularly pointed out and distinctly claimed in the claims at the conclusion of the specification. The foregoing and other features, and advantages of the invention are apparent from the following detailed description taken in conjunction with the accompanying drawings in which:
  • FIG. 1 is a cross-sectional view of an embodiment of a tube expansion bullet;
  • FIG. 2 is another cross-sectional view of an embodiment of an expansion bullet; and
  • FIG. 3 is a cross-sectional view of a typical expansion bullet.
  • The detailed description explains embodiments of the invention, together with advantages and features, by way of example with reference to the drawings.
  • DETAILED DESCRIPTION OF THE INVENTION
  • Shown in FIG. 1 is a schematic of an expansion mechanism 10 for a tube 12 of, for example, a heat exchanger. The illustrated tube 12 is formed of an aluminum material, but other materials, for example, copper, may be utilized. The mechanism 10 includes a mandrel 14 which supports an expansion bullet 16. The expansion bullet 16 has a maximum diameter 18 greater than an unexpanded diameter 20 of the tube 12. The mandrel 14 and bullet 16 are driven into the tube 12 to expand the tube 12 to an inner diameter substantially equal to the maximum diameter 18 of the bullet 16. Though, expansion utilizing a mandrel 14 to drive the bullet 16 is shown in FIG. 1 and described herein, it is merely exemplary. It is to be appreciated that other bullet 16 driving means, such as a fluid applied to the bullet 16, are contemplated within the present scope.
  • To reduce the force necessary to expand the tube 12 to the desired diameter, the bullet 16 has a specific cross-sectional shape, as shown in FIG. 2. The bullet 16 is substantially symmetrical about a bullet axis 22 extending along a length 24 of the bullet 16. The bullet 16 has an inner diameter 26 defining a bullet opening 28 for mounting the bullet on the mandrel 14. The bullet has a leading edge face 30 and a trailing edge face 32 which are substantially planar and perpendicular to the bullet axis 22, and a bullet body 34 extending the length of the bullet 16 between the leading edge face 30 and the trailing edge face 32. A surface profile of the bullet body 34 is a single continuous radius 36. While a single continuous radius is shown in FIG. 2, it is to be appreciated that other configurations to reduce friction may be utilized. For example, the radius 36 may be interrupted along its length by on or more chamfers or steps.
  • A center point 38 of the continuous radius 36 is shown in FIG. 2. In some embodiments, an axial position of the center point 38 is biased toward the trailing edge face 32 such that, a leading edge face diameter 40 is less than a trailing edge face diameter 42. In some embodiments, the center point 38 is located along the length of the bullet 16 between about ¼ and ⅓ of the distance from the trailing edge face 32 to the leading edge face 30. Further, in some embodiments, the center point 38 is offset radially from the bullet axis 22. For example, as shown in FIG. 2, the center point 38 may be located outside of the bullet 16.
  • By way of example, a bullet 16 utilized to expand a tube 12 having about a ⅜″ outer diameter 44 is shown in FIG. 2. For such a bullet 16, the leading edge face diameter 40 is about 0.188 inches and the trailing edge diameter 42 is about 0.321 inches. The continuous radius 36 of the bullet 16 is about 0.350 inches. The continuous radius 36 is substantially proportional to the outer diameter 44 (shown in FIG. 1) of the tube 12 to be expanded. For larger outer diameters 44 a larger radius 36 is utilized, while for a smaller outer diameter 44, a bullet 16 having a smaller radius 36 is utilized.
  • In some embodiments, the bullet opening 28 is chamfered at the leading edge face 30 and the trailing edge face 32 to ease installation of the bullet 16 on the mandrel 14.
  • In some embodiments, the bullet 16 is formed from a steel material, for example, tool steel. It is to be appreciated, however, that other suitable materials may be utilized and are contemplated within the present scope. To decrease buildup of aluminum material on the bullet 16 during use, and thus reduce galling between the bullet 16 and the tube 12, the bullet 16 may include a coating material applied to the bullet 16. This coating may be, for example, a metallic coating, a plastic coating, a nano coating, and/or a surface treatment, or the like to reduce friction and galling, add wear resistance, and/or increase corrosion resistance. In some embodiments, the coating is a hard chrome plating.
  • While the invention has been described in detail in connection with only a limited number of embodiments, it should be readily understood that the invention is not limited to such disclosed embodiments. Rather, the invention can be modified to incorporate any number of variations, alterations, substitutions or equivalent arrangements not heretofore described, but which are commensurate with the spirit and scope of the invention. Additionally, while various embodiments of the invention have been described, it is to be understood that aspects of the invention may include only some of the described embodiments. Accordingly, the invention is not to be seen as limited by the foregoing description, but is only limited by the scope of the appended claims.

Claims (20)

1. An expansion bullet for a heat exchanger tube comprising:
a leading edge face;
a trailing edge face; and
a bullet body insertable into a tube of a heat exchanger to expand the tube, the bullet body extending from the leading edge face to the trailing edge face, the bullet body having an outer profile defined by a single radius.
2. The expansion bullet of claim 1, wherein the single radius is substantially continuous and unbroken from the leading edge face to the trailing edge face.
3. The expansion bullet of claim 1, wherein a center point of the single radius is axially offset along a length of the expansion bullet.
4. The expansion bullet of claim 3, wherein the center point is axially offset such that a leading edge face diameter is smaller than a trailing edge face diameter.
5. The expansion bullet of claim 1, wherein the leading edge face and/or the trailing edge face are substantially axially-oriented planar faces.
6. The expansion bullet of claim 1, wherein a center point of the single continuous radius is radially offset from a central axis of the expansion bullet.
7. The expansion bullet of claim 6, wherein the center point is offset such that the center point is located outside of the expansion bullet.
8. The expansion bullet of claim 1, further comprising a coating applied to the expansion bullet.
9. The expansion bullet of claim 8, wherein the coating is one or more of a metallic coating, a plastic coating, a nano coating, or a surface treatment to reduce friction.
10. The expansion bullet of claim 1, further comprising a bullet opening to secure the expansion bullet to a mandrel.
11. An expansion mechanism for a tube of heat exchanger comprising:
a bullet driving device; and
an expansion bullet configured to be driven by the bullet driving device:
a leading edge face;
a trailing edge face; and
a bullet body insertable into a tube of heat exchanger to expand the tube, the bullet body extending from the leading edge face to the trailing edge face, the bullet body having an outer profile defined by a single radius.
12. The expansion mechanism of claim 11, wherein the single radius is substantially continuous and unbroken from the leading edge face to the trailing edge face.
13. The expansion mechanism of claim 11, wherein a center point of the single continuous radius is axially offset along a length of the expansion bullet.
14. The expansion mechanism of claim 13, wherein the center point is axially offset such that a leading edge face diameter is smaller than a trailing edge face diameter.
15. The expansion mechanism of claim 11, wherein the leading edge face and/or the trailing edge face are substantially axially-oriented planar faces.
16. The expansion mechanism of claim 11, wherein a center point of the single continuous radius is radially offset from a central axis of the expansion bullet.
17. The expansion mechanism of claim 16, wherein the center point is offset such that the center point is located outside of the expansion bullet.
18. The expansion mechanism of claim 11, further comprising a coating applied to the expansion bullet.
19. The expansion mechanism of claim 18, wherein the coating is one or more of a metallic coating, a plastic coating, a nano coating, or a surface treatment to reduce friction.
20. The expansion mechanism of claim 11, wherein the bullet driving device is a mandrel to which the bullet is secured.
US13/981,114 2011-01-24 2012-01-20 Expansion bullet for heat exchanger tube Abandoned US20130298632A1 (en)

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Application Number Priority Date Filing Date Title
US13/981,114 US20130298632A1 (en) 2011-01-24 2012-01-20 Expansion bullet for heat exchanger tube

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US201161435641P 2011-01-24 2011-01-24
US13/981,114 US20130298632A1 (en) 2011-01-24 2012-01-20 Expansion bullet for heat exchanger tube
PCT/US2012/022012 WO2012102960A1 (en) 2011-01-24 2012-01-20 Expansion bullet for heat exchanger tube

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015123498A (en) * 2013-12-27 2015-07-06 三菱アルミニウム株式会社 Tube expansion plug

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4031738A (en) * 1974-08-22 1977-06-28 Mannesmannrohren-Werke Ag. Plug for plug rolling
US4646548A (en) * 1982-09-29 1987-03-03 Carrier Corporation Tube expanding and grooving tool and method
US5031434A (en) * 1989-02-28 1991-07-16 Nkk Corporation Plug for manufacturing seamless steel pipe
US20100218533A1 (en) * 2007-11-28 2010-09-02 Sangmu Lee Air conditioner

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02182330A (en) * 1989-01-10 1990-07-17 Mitsubishi Metal Corp Expanding plug made of ceramic
JP4759226B2 (en) * 2004-03-31 2011-08-31 株式会社コベルコ マテリアル銅管 Tube expansion tool and tube expansion method using the same
JP4913371B2 (en) * 2004-10-04 2012-04-11 古河電気工業株式会社 Manufacturing method of heat exchanger

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4031738A (en) * 1974-08-22 1977-06-28 Mannesmannrohren-Werke Ag. Plug for plug rolling
US4646548A (en) * 1982-09-29 1987-03-03 Carrier Corporation Tube expanding and grooving tool and method
US5031434A (en) * 1989-02-28 1991-07-16 Nkk Corporation Plug for manufacturing seamless steel pipe
US20100218533A1 (en) * 2007-11-28 2010-09-02 Sangmu Lee Air conditioner

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015123498A (en) * 2013-12-27 2015-07-06 三菱アルミニウム株式会社 Tube expansion plug

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Owner name: CARRIER CORPORATION, CONNECTICUT

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KONKLE, ERIC;WOODARD, JAMES H.;THOMAS, JASON MICHAEL;AND OTHERS;SIGNING DATES FROM 20110125 TO 20110501;REEL/FRAME:027723/0197

AS Assignment

Owner name: CARRIER CORPORATION, CONNECTICUT

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KONKLE, ERIC;WOODARD, JAMES H.;THOMAS, JASON MICHAEL;AND OTHERS;SIGNING DATES FROM 20110125 TO 20110501;REEL/FRAME:030854/0389

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION