US3641798A - Expanding tool - Google Patents

Expanding tool Download PDF

Info

Publication number
US3641798A
US3641798A US41808A US3641798DA US3641798A US 3641798 A US3641798 A US 3641798A US 41808 A US41808 A US 41808A US 3641798D A US3641798D A US 3641798DA US 3641798 A US3641798 A US 3641798A
Authority
US
United States
Prior art keywords
mandrel
rollers
tool
nonrigid
tube
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
US41808A
Other languages
English (en)
Inventor
Irving D Press
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.)
Crane Co
Original Assignee
Resistoflex 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 Resistoflex Corp filed Critical Resistoflex Corp
Application granted granted Critical
Publication of US3641798A publication Critical patent/US3641798A/en
Assigned to UMC INDUSTRIES, INC., A DE CORP. reassignment UMC INDUSTRIES, INC., A DE CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: RESISTOFLEX CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • B21D41/00—Application of procedures in order to alter the diameter of tube ends
    • B21D41/02—Enlarging
    • 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

  • the present invention relates to a tool for expanding the inside diameter of the end of a metal tube, and more particularly, to a tool for accomplishing such expansion for the purpose of attaching an end fitting to the tube end.
  • End fittings which have a bore enterable from one end by the end of a metal tube with a sliding fit where the bore is provided with a plurality of axially spaced circumferential grooves into which the metal of the tube is caused to flow by radial expansion of the inside diameter of the tube.
  • a tool has been used for accomplishing the assembly mentioned previously.
  • Such tool includes a fixture die for surrounding and backing up the fitting and an expander unit.
  • the expander unit has a plurality of rollers spaced circumferentially around its longitudinal axis and located within the confines of individual slots in a tubular cage with the axes of the rollers skewed slightly relative to the axis of the expander unit.
  • the rollers are radially projected by interaction with the tapered surface of a rotatable hard metal mandrel when the latter translates axially relative to and between the rollers. Rotation of the mandrel imparts epicyclic motion to the rollers when they are in contact with a tube wall.
  • the slots which confine the rollers have tapered sidewalls permitting the rollers to fall inwardly if otherwise unrestrained but preventing radially outward separation of the rollers from the cage. To prevent radially inward separation the mandrel is constrained to remain between the rollers at all times.
  • the mandrel projects axially a substantial distance therefrom when the mandrel is fully advanced within the expander. As will be explained more fully hereinafter, the projection of the mandrel has placed a limitation on the proximity of a bend in the tubing as it leaves the end fitting.
  • the end of the mandrel which remains between the rollers when the mandrel is fully retracted is made nonrigid while the remainder of the mandrel is rigid.
  • FIG. 1 is an elevational view partly in section showing a typical assembly of an end fitting and a metal tube with a bend adjacent the fitting;
  • FIG. 2 is a longitudinal sectional view through the tool fixture and expander in association with the assembly of FIG. 1 at thecompletion of the expanding operation;
  • FIG. 3 is a longitudinal sectional view through an expander unit constructed in accordance with the present invention.
  • FIG. 4 is a view similar to FIG. 2 showing the use of the tool of FIG. 3.
  • FIG. 1 there is shown a typical assembly consisting of an end fitting l and a section of metal tubing 11 wherein the tubing is secured to the fitting by radially ex panding the inner surface 12 to displace metal into the axially spaced circumferential grooves 13.
  • the arrow 14 designates the distance from the end 15 of the fitting 10 to the inner surface of the bend in the tube 11 as measured along the longitudinal axis 16 of the fitting.
  • the assembly of FIG. 1 is located within the fixture die 17, normally formed in two halves and held together by a die cage ring 18 and lock screw 19.
  • the enclosure 20 for the expander tool bearing is secured by an interlocking groove and flange arrangement within the fixture 17.
  • the expander unit includes a plurality of rollers of which two, 21 and 22, are seen in FIG. 2, spaced circumferentially around the longitudinal axis of the unit located within the confines of individual slots in the tubular cage 23.
  • the axes of the rollers are skewed slightly relative to the axis of the expander unit.
  • the mandrel 24 has one end provided with the wrench flats at 25 and the other end at 26 provided with a reduced diameter portion for retaining the rollers when the mandrel is fully retracted. As shown in FIG. 2, the mandrel is in its fully forward position.
  • the fully forward position may be regulated by adjustment of the stop sleeve or collar 27 which is locked in place by a lock nut 28.
  • FIG. 2 shows the expander unit in the fully forward position after completion of an expanding operation.
  • the mandrel would be fully retracted to the right as viewed in the drawing.
  • a wrench is applied to the flats 25 and the mandrel is rotated in a clockwise direction as viewed from the wrenching end.
  • the mandrel is rotated, it imparts epicyclic motion to the rollers 21 and 22 which, in turn, tend to feed the tapered mandrel axially forward toward the position shown in FIGS. 2.
  • the mandrel 24 has a central collar or shoulder 31 which cooperates with the balls 32 and 33 to prevent further retraction of the mandrel beyond the position shown in FIG. 3.
  • the end of the mandrel at 34 is provided with a gradual taper which cooperates with the rollers such as 22 to cause radially outward projection thereof as the mandrel advances longitudinally.
  • the cage 23 is provided with a flange 35 which cooperates with the thrust bearings 36 and 37 within the enclosure 20.
  • a length of head chain 38 is joined to the end 39 of the mandrel 24.
  • the length of the bead chain section 38 is just sufficient to extend to the far end of the rollers.
  • FIG. 4 the advantage achieved by use of the expander unit of FIG. 3 will be readily apparent.
  • the mandrel 24 is in its fully forward position with the bead chain 38 pushed out beyond the cage 23 and depending limply from the end 30 of the mandrel.
  • the bend 40 in the tube 41 can be located right up against the end of the fitting being limited only by the clearance required for the fixture dies 17.
  • any nonrigid flexible strand or comparable element may be joined to the end of the rigid mandrel section and provide the necessary retention of the rollers when the mandrel is fully retracted. Wlth the smaller diameter expander units, it may be found that a length of wire is preferable in view of the difficulty in obtaining a bead chain of sufficiently small bead diameter. Any convenient method may be employed for attaching the nonrigid portion to the rigid portion of the mandrel.
  • a tool for expanding the inside diameter of the end of a tube wherein a plurality of rollers, which are circumferentially spaced around the longitudinal axes of the tool within the confines of slots in a tubular cage with the axes of the rollers nonrigid while the remainder of the mandrel is rigid.
  • said nonrigid end of the mandrel comprises a length of head chain attached to the adjacent end of the rigid remainder of the mandrel.
  • a tool according to claim I wherein said nonrigid end of the mandrel comprises a flexible strand extending from the adjacent end of the rigid remainder of the mandrel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Metal Extraction Processes (AREA)
US41808A 1970-06-01 1970-06-01 Expanding tool Expired - Lifetime US3641798A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US4180870A 1970-06-01 1970-06-01

Publications (1)

Publication Number Publication Date
US3641798A true US3641798A (en) 1972-02-15

Family

ID=21918431

Family Applications (1)

Application Number Title Priority Date Filing Date
US41808A Expired - Lifetime US3641798A (en) 1970-06-01 1970-06-01 Expanding tool

Country Status (4)

Country Link
US (1) US3641798A (fr)
DE (1) DE2126433A1 (fr)
FR (1) FR2093968A1 (fr)
GB (1) GB1288533A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995007799A1 (fr) * 1993-09-16 1995-03-23 Sierracin Corporation Outil d'estampage a rouleaux

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021202883A1 (de) 2021-03-24 2022-09-29 Glatt Gesellschaft Mit Beschränkter Haftung System mit einer Vorrichtung zur Herstellung einer Rohrleitungseinheit und Verfahren zur Herstellung einer Rohrleitungseinheit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1530381A (en) * 1923-05-01 1925-03-17 Western Union Telegraph Co Tube-expanding tool

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1530381A (en) * 1923-05-01 1925-03-17 Western Union Telegraph Co Tube-expanding tool

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995007799A1 (fr) * 1993-09-16 1995-03-23 Sierracin Corporation Outil d'estampage a rouleaux
US5454152A (en) * 1993-09-16 1995-10-03 Sierracin Corporation Roller swaging tool

Also Published As

Publication number Publication date
GB1288533A (fr) 1972-09-13
FR2093968A1 (fr) 1972-02-04
DE2126433A1 (de) 1971-12-23

Similar Documents

Publication Publication Date Title
US12055203B2 (en) Cams for pipe grooving device
US3358492A (en) Mandrel construction
US4383429A (en) Apparatus for forming a point at the end of a metal tube by means of a drawing operation
US3383892A (en) Manufacture of integrally finned tubing
US3630058A (en) Process and apparatus for forming tubes with spiral corrugations
US2398278A (en) Adjustable stop for lathe spindles
US4134286A (en) Method and apparatus for expanding tubes
US3641798A (en) Expanding tool
US2219784A (en) Rolling tool
US2447909A (en) Tool for beading or expanding metallic tube ends
US2661639A (en) Collapsible boring tool
US3906771A (en) Expander for random trim tubing
US2657733A (en) Tool for making a circumferential bead or swage of predetermined size in metal pipes
US3426565A (en) Tube expander
US2767766A (en) Tube expander, including a reverse rolling chuck
US2040440A (en) Multiple rolling tool
US4118964A (en) Lubricated mandrel for a finning machine
US2736950A (en) Method and apparatus for tube expansion
US4232541A (en) Drawing technique
US3247695A (en) Tube expansion tool
US2854058A (en) Tube expander with slip clutch controlled mandrel
US3221528A (en) Tube expansion tool
US3280612A (en) Chuck fixture for tube bending apparatus
US1322921A (en) mauptn
US1305808A (en) Expander

Legal Events

Date Code Title Description
AS Assignment

Owner name: UMC INDUSTRIES, INC., HIGH RIDGE PARK, STAMFORD,

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:RESISTOFLEX CORPORATION;REEL/FRAME:004193/0702

Effective date: 19831115