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US3635073A - Mechanical tube expander - Google Patents

Mechanical tube expander Download PDF

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Publication number
US3635073A
US3635073A US888785A US3635073DA US3635073A US 3635073 A US3635073 A US 3635073A US 888785 A US888785 A US 888785A US 3635073D A US3635073D A US 3635073DA US 3635073 A US3635073 A US 3635073A
Authority
US
United States
Prior art keywords
mandrel
tube
gripping
collar
spring
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
US888785A
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English (en)
Inventor
Richard M Oliver
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.)
Combustion Engineering Inc
Original Assignee
Combustion Engineering Inc
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 Combustion Engineering Inc filed Critical Combustion Engineering Inc
Application granted granted Critical
Publication of US3635073A publication Critical patent/US3635073A/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
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/08—Tube expanders
    • B21D39/10—Tube expanders with rollers for expanding only

Definitions

  • MECHANICAL TUBE EXPANDER [72] Inventor: Richard M. Oliver, Chattanooga, Tenn.
  • ABSTRACT A mechanical tube expander including a cage having rollers mounted therein and a tapered mandrel to coact therewith for expanding the tube.
  • a locking member permits movement of the mandrel a predetermined distance after the rollers make initial contact with the inner surface of the tube, thereby causing a predetermined expansion of the tube.
  • the tube expander of the present invention makes use of releaseable locking means and a spring having a given amount of compression, which members coact with a tapered mandrel and a collar means which abuts a tube end, for causing expansion of the tube a predetermined amount.
  • releaseable locking means and a spring having a given amount of compression which members coact with a tapered mandrel and a collar means which abuts a tube end, for causing expansion of the tube a predetermined amount.
  • FIG. 1 is a cross section of a tube expander at the start of an expanding operation
  • FIG. 2 is a cross section of the tool at the completion of an expanding operation
  • FIG. 3 is a sectional view of the gripping mechanism taken on line 3-3 of FIG. 2.
  • FIG. 1 numeral denotes a mechanical tube expander having a tapered mandrel 12.
  • Mandrel 12 extends through a cage which houses a plurality of rollers 16. As the mandrel moves longitudinally through the cage 14 from right to left as shown in FIG. 1, the increasing diameter of the mandrel moves the rollers radially outward, until they contact the inner surface of a tube 17 which is to be expanded into good physical contact with a tube sheet 19.
  • a collar 18 determines how far into the tube 17 the cage and its associated rollers extend.
  • a thrust bearing 20 permits rotation of the cage 14 during the expanding operation, while permitting the collar 18 to remain stationary. Rotation of the collar 18 during the expanding operation could cause scarring of the tube end and tube sheet against which it abuts, and would be undesirable.
  • a suitable pneumatic, hydraulic, or electric motor (not shown) is attached to the right end 24 of mandrel 12 to cause rotation thereof.
  • a quick release sleeve 26 surrounds the mandrel 12 rearwardly of the collar 18.
  • This sleeve 26 has a tapered or conical inner surface which acts as a wedge.
  • Integral with sleeve 26 is a hand ring 27.
  • a cylindrical member 28 Positioned inside of sleeve 26 is a cylindrical member 28, which acts as a housing for a pair of locking or gripping lugs 30.
  • Integral with housing 28 is a thumb ring 22.
  • the lugs 30 extend through slots (see FIG.
  • a spring 36 biases the quick release sleeve 26 and thumb ring 22 apart.
  • a spacer spring 38 Positioned intermediate the collar 18 and cylindrical member 28 is a spacer spring 38.
  • spring seat 40 On the left end of spring 38 a spring seat 40 is located.
  • Seat 40 has a cylindrical extension 41, the purpose of which will be later described.
  • the drive motor for the tool is actuated at this time, causing rotation of the mandrel, which in turn causes rotation of the rollers 16 and the roller cage 14.
  • the rollers 16 to mandrel 12 axial relationship is skewed 1 to 3 degrees which is well known in the industry as a self-feeding expander.
  • Rotation of the mandrel 12 causes said mandrel to feed inwardly to the left, the rollers 16 thereby being moved radially outward to expand the tube 17.
  • the cylindrical member 28 moves along with the mandrel 12.
  • Continued rotation of the mandrel 12 causes continued longitudinal travel of the mandrel l2 and cylindrical member 28 which causes compression of spring 38.
  • the longitudinal movement of the mandrel 12 and member 28 continues until the end of cylindrical member 28 makes contact with the end 41 of the spring seat 40. This condition of the tool is shown in FIG. 2. No further longitudinal movement of the mandrel is possible at this time.
  • the mandrel 12 can move only a predetermined longitudinal distance D" after the rollers 16 initially touch and make contact with the inner surface of tube 17. Since the mandrel has a fixed angle of taper throughout its tapered length portion, the rollers 16 will be cammed outwardly a fixed given amount due to the movement of the mandrel, causing the tube 17 to be expanded a predetermined amount.
  • spring seat 40 with a cylindrical piece 41 is used as the stop member for abutting against the end of member 38 at the end of the expanding operation, this member could be eliminated. If this were done, the spring 38 would have to be fully compressed before longitudinal movement of the mandrel 12 were stopped. In this instance, the predetermined distance the mandrel would move during the expansion operation would be determined by the difference in length of spring 38 in its uncompressed and fully compressed state.
  • the tube expander of the present invention can be used by even a relatively inexperienced operator to cause a predetermined amount of tube expansion time after time. Tolerance is very good. For example, if the grooves 32 are 1/32-inch apart, and 1/16 inch of longitudinal travel of the mandrel causes a 0.00l-inch tube expansion by the rollers 16, the tolerance will be plus or minus 0.0005 inch of the desired expanded tube diameter.
  • the predetermined amount of tube expansion can be readily and easily changed by using different sized spacer springs.
  • a tube expander including a tapered mandrel, a cage with radially movable rollers mounted therein surrounding the mandrel, which rollers move outwardly as the tapered mandrel moves longitudinally therethrough, collar means surrounding the mandrel rearwardly of the cage and adapted to abut against the end of the tube to be expanded, gripping means surrounding the mandrel rearwardly of the collar means, spring means positioned between the collar means and the gripping means and adapted to abut against the end of each, said gripping means having a first position which permits longitudinal movement of the mandrel with respect thereto, and a second position in gripping contact with the mandrel, so as to move longitudinally therewith, whereby when a tube is to be expanded the gripping means is originally maintained in its first position until the rollers contact the inner surface of the tube to be expanded and the spring in its uncompressed state is in contact at one end with the collar means and at its other end with the gripping means, at which time the gripping means is moved
  • the gripping means includes lug means which are spring biased away from the mandrel, and wedge means for forcing the lug means into engagement with the mandrel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
US888785A 1969-12-29 1969-12-29 Mechanical tube expander Expired - Lifetime US3635073A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US88878569A 1969-12-29 1969-12-29

Publications (1)

Publication Number Publication Date
US3635073A true US3635073A (en) 1972-01-18

Family

ID=25393891

Family Applications (1)

Application Number Title Priority Date Filing Date
US888785A Expired - Lifetime US3635073A (en) 1969-12-29 1969-12-29 Mechanical tube expander

Country Status (5)

Country Link
US (1) US3635073A (xx)
CA (1) CA919073A (xx)
ES (1) ES386890A1 (xx)
NL (1) NL7018878A (xx)
SE (1) SE398202B (xx)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5022254A (en) * 1988-08-09 1991-06-11 Kramer Antonio H Method and device for the manufacture of can bodies by extension, including expansion of the diameter and reduction of the thickness of the sheet metal, starting out from a can body with smaller diameter, made of thicker sheet metal
GB2392933B (en) * 2002-09-10 2006-05-31 Weatherford Lamb Tubing expansion tool
US10987717B2 (en) * 2018-02-28 2021-04-27 Citic Dicastal Co., Ltd. Device for fixing metal tube with plate by expansion

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2393283A (en) * 1942-07-29 1946-01-22 Elliott Co Method of expanding tubes
US2405399A (en) * 1943-09-22 1946-08-06 Bugg Tube beading and expanding tool and method
US2736950A (en) * 1950-09-14 1956-03-06 Airetool Mfg Co Method and apparatus for tube expansion
US2737996A (en) * 1951-07-06 1956-03-13 Babcock & Wilcox Co Tube expander involving automatic roller setting and release mechanism
US3247695A (en) * 1962-08-17 1966-04-26 Carrier Corp Tube expansion tool

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2393283A (en) * 1942-07-29 1946-01-22 Elliott Co Method of expanding tubes
US2405399A (en) * 1943-09-22 1946-08-06 Bugg Tube beading and expanding tool and method
US2736950A (en) * 1950-09-14 1956-03-06 Airetool Mfg Co Method and apparatus for tube expansion
US2737996A (en) * 1951-07-06 1956-03-13 Babcock & Wilcox Co Tube expander involving automatic roller setting and release mechanism
US3247695A (en) * 1962-08-17 1966-04-26 Carrier Corp Tube expansion tool

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5022254A (en) * 1988-08-09 1991-06-11 Kramer Antonio H Method and device for the manufacture of can bodies by extension, including expansion of the diameter and reduction of the thickness of the sheet metal, starting out from a can body with smaller diameter, made of thicker sheet metal
GB2392933B (en) * 2002-09-10 2006-05-31 Weatherford Lamb Tubing expansion tool
AU2003246025B2 (en) * 2002-09-10 2009-12-10 Weatherford Technology Holdings, Llc Tubing Expansion Tool
US10987717B2 (en) * 2018-02-28 2021-04-27 Citic Dicastal Co., Ltd. Device for fixing metal tube with plate by expansion

Also Published As

Publication number Publication date
ES386890A1 (es) 1973-09-01
CA919073A (en) 1973-01-16
NL7018878A (xx) 1971-07-01
SE398202B (sv) 1977-12-12

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