US3631587A - Method for forming corners of omega-type expansion joints - Google Patents

Method for forming corners of omega-type expansion joints Download PDF

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Publication number
US3631587A
US3631587A US34090A US3631587DA US3631587A US 3631587 A US3631587 A US 3631587A US 34090 A US34090 A US 34090A US 3631587D A US3631587D A US 3631587DA US 3631587 A US3631587 A US 3631587A
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US
United States
Prior art keywords
forming
cornerpieces
expansion joints
recited
plate means
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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
US34090A
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English (en)
Inventor
Byron J Round
Gunter J Stalph
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Combustion Engineering Inc
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Combustion Engineering Inc
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Publication date
Application filed by Combustion Engineering Inc filed Critical Combustion Engineering Inc
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Publication of US3631587A publication Critical patent/US3631587A/en
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    • 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
    • B21D53/00—Making other particular articles
    • B21D53/16—Making other particular articles rings, e.g. barrel hoops
    • B21D53/18—Making other particular articles rings, e.g. barrel hoops of hollow or C-shaped cross-section, e.g. for curtains, for eyelets
    • 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/14—Spinning
    • B21D22/16—Spinning over shaping mandrels or formers

Definitions

  • Kessler ABSTRACT A method of fabricating an expansion joint embodying an inwardly facing U-shaped bellows member in which the comer portions of the joint are rounded and formed of united segments of oppositely facing plates having an armate portion produced by a spinning operation.
  • expansion joints of this type provide adequate performance in systems conducting relatively clean fluids, their use in systems wherein particle-laden fluids are conducted, such as the conduit systems of vapor generators in which heating gases bearing solid particles of fly ash and other contaminants flow, is limited.
  • particle-laden fluids such as the conduit systems of vapor generators in which heating gases bearing solid particles of fly ash and other contaminants flow
  • the joints become inoperative or are otherwise adversely affected.
  • Such joints employ a U-shaped, sheet metal membrane spanning the space between the adjacent conduit sections with the convex surface innermost. By means of this arrangement, grooves or other spaces in which the precipitated solids can accumulate, are eliminated from the joint.
  • the present invention is directed to problems associated with the fabrication of expansion joints for use in connecting conduit sections having a rectangular cross section.
  • Such joints have a rectangular configuration necessitating a connection of the comers at the sides. It has been proposed to effect this connection by a mitered connection of the adjacent sides at the corner, but this results in the establishment of points of stress concentration at the comers that are detrimental to the integrity of the stnrcture in that it creates the possibility of failure by cycling fatigue.
  • This problem can, in turn, be solved by forming the expansion joints with rounded comers; however, difi'rculty arises in the fabrication of rounded comers by conventional dye-forming procedures due to the magnitude of the diameter-to-thickness ratio encountered.
  • the present invention is directed to the solution of this problem and to the manner of fabricating an improved form of expansion joint.
  • the present invention relates to a novel method for fabricating expansion joints; more particularly, it relates to an improved manner of fabricating arcuate comerpieces for attachment between their respective rectangularly disposed, straight side members of an expansion joint, which members are U-shaped in cross section.
  • the invention entails forming sheet metal plates having a central opening into a surface of revolution that is substantially J -shaped in cross section. This metal-forming step is accomplished by means of a spinning operation. Thereafter, a pair of so-formed plates are placed in opposed abutting relation and are buttwelded about the line of abutment. Following this, the assembly is divided into quadrants each of which forms one of the four corners of the expansion joint.
  • each plate can be divided in half after the spinning operation has been completed and the formed ends of each plate half butt-welded together to form an assembly which, when severed in half, produces two comerpieces.
  • FIG. 1 is a pictorial representation of two rectangular conduit sections joined by expansion joint formed according to the present invention
  • FIG. 2 is a plan view of an expansion joint formed according to the invention.
  • FIG. 3 is a section taken along line 3-3 of FIG. 2;
  • FIG. 4 illustrates a typical sheet metal plate prior to processing into a comerpiece according to the invention
  • FIG. 5 is a schematic representation of a sheet metal plate being processed by means of a spinning operation according to the invention.
  • FIG. 6 is a pictorial representation of two opposed formed plates prior to assembly
  • FIG. 1 there is illustrated part of a conduit system 10 for conducting gaseous fluids at elevated pressures and temperatures.
  • the system can, for example, be taken as being a portion of the combustion gas discharge ducting of a vapor generator (not shown).
  • the system includes a pair of spaced, axially aligned conduit sections 12, 14 which, in the disclosed arrangement, are of rectangular cross section.
  • the two conduit sections l2, 14 are interconnected by means of an expansion joint 16 arranged to accommodate relative movement that normally occurs between the sections in response to changes in the pressure or temperature of the gases being conducted.
  • the expansion joint 16 is connected between the conduit sections 12, 14 by means of appropriate frame structure indicated as 32, 34 and described in detail hereinafter.
  • 'Ihejoint comprises an inwardly bowed, flexible, sheet metal membrane 18 which includes rectangularly arranged side and end membets, 20 and 22 respectively, that are joint in assembled relation by means of comerpieces 24 in order to conform to the rectangular configuration of the conduit sections 12, 14.
  • the side and end members 20, 22 attach the comer pieces 24 by butt-welding as indicated at 26.
  • the membrane 18 that comprises the expansion joint 16 is defined, in section, by a substantially semicircular bend portion 28 that terminates at both ends in opposed, straight legs 30.
  • the membrane is assembled in the joint with the convex surface of the bend portion 28 disposed inwardly with the passage formed by the conduit sections l2, 14 in facing relation to the gases flowing therethrough.
  • the membrane 18 is attached between adjacent spaced conduit sections 12, 14 by means of oppositely spaced frame structures 32, 34
  • These structures in their simplest form as shown in the attached drawings, comprise rectangularly arranged structural members 36, here shown as angles having one leg welded securely to the external surface of the adjacent conduit section and the other leg similarly secured to the membrane 18. Due to the fact that the membrane 18 is relatively thin, thickneses of l2to 16- gauge sheet metal being most desirable it is advantageous, in order to prevent incurring damage to the membrane caused by field welding it directly to the structural members, to effect the connection by shop welding the legs 30 of the membrane to elongated plates or bars, 38 or 40, which are, in turn, welded to the structural members in the field.
  • FIG. 4 there is shown a flat, sheet metal blank a here shown as having a circular periphery but which could equally as well be formed with rectangular sides.
  • the blank a is provided with a central opening b having a diameter of sufficient size to permit the blank to undergo a spinning operation as hereinafter described.
  • the blank a is attached to a chuck c mounted on the rotatable faceplate d of a spinning lathe in order to undergo a spinning operation.
  • the chuck c most commonly a wooden member, is formed with an external surface e that is arcuate in section and which coacts with a spinning roll f to form the blank a with a surface of revolution g formed concentrically about the central opening b.
  • the arcuate external surface e of the chuck c is formed on a curve of approximately 90 extent whereupon the surface of revolution g formed on the blank a substantially I-shaped in section upon completion of the spinning operation.
  • the plates 38, 40 are attached to the upper and lower surfaces of the respective legs 30 of the membrane, the elongated plates 38 being attached to the legs associated with the sides and end portions 20, 22 of the membrane and the L-shaped plate being attached to the comer plates 26. Attachment of the plates 38, 40 to the membrane legs 30 can be effected by welding with equipment present in a shop thereby rendering the application of a weld less hazardous to the sheet metal that comprises the membrane. The final connection of the plates 38, 40 to the structural members 36 can be effected by hand welding in the field.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Joints Allowing Movement (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
US34090A 1970-05-04 1970-05-04 Method for forming corners of omega-type expansion joints Expired - Lifetime US3631587A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US3409070A 1970-05-04 1970-05-04

Publications (1)

Publication Number Publication Date
US3631587A true US3631587A (en) 1972-01-04

Family

ID=21874239

Family Applications (1)

Application Number Title Priority Date Filing Date
US34090A Expired - Lifetime US3631587A (en) 1970-05-04 1970-05-04 Method for forming corners of omega-type expansion joints

Country Status (8)

Country Link
US (1) US3631587A (enExample)
JP (1) JPS4946709B1 (enExample)
BE (1) BE766635A (enExample)
CA (1) CA938779A (enExample)
CH (1) CH536148A (enExample)
DE (1) DE2116967A1 (enExample)
GB (1) GB1326505A (enExample)
ZA (1) ZA712838B (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITPN20100062A1 (it) * 2010-10-20 2012-04-21 Free Spirits S R L Procedimento per la fabbricazione di curve tubolari metalliche e curve tubolari ottenute con tale procedimento
CN102967069A (zh) * 2012-12-19 2013-03-13 徐阳 太阳能集热直通真空管及其消气剂环及其制造方法
CN110918750A (zh) * 2019-12-02 2020-03-27 西安航天动力研究所 一种薄壁金属ω截面密封环旋压成形装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6071833B2 (ja) * 2013-02-18 2017-02-01 三菱日立パワーシステムズ株式会社 排ガス用触媒装置
CN106140979A (zh) * 2016-08-19 2016-11-23 江阴市福瑞得铜业有限公司 一种用于加工铜管的单顶针模具

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2368403A (en) * 1941-10-21 1945-01-30 United Aircraft Corp Method of manufacturing heat radiators
US3488766A (en) * 1967-02-15 1970-01-06 Wisconsin Centrifugal Foundry Method of casting elbows
US3550253A (en) * 1967-01-23 1970-12-29 Sulzer Ag Process for manufacturing pipe bends from cast metallic material and a pipe bend

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2368403A (en) * 1941-10-21 1945-01-30 United Aircraft Corp Method of manufacturing heat radiators
US3550253A (en) * 1967-01-23 1970-12-29 Sulzer Ag Process for manufacturing pipe bends from cast metallic material and a pipe bend
US3488766A (en) * 1967-02-15 1970-01-06 Wisconsin Centrifugal Foundry Method of casting elbows

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITPN20100062A1 (it) * 2010-10-20 2012-04-21 Free Spirits S R L Procedimento per la fabbricazione di curve tubolari metalliche e curve tubolari ottenute con tale procedimento
CN102967069A (zh) * 2012-12-19 2013-03-13 徐阳 太阳能集热直通真空管及其消气剂环及其制造方法
CN110918750A (zh) * 2019-12-02 2020-03-27 西安航天动力研究所 一种薄壁金属ω截面密封环旋压成形装置
CN110918750B (zh) * 2019-12-02 2021-05-04 西安航天动力研究所 一种薄壁金属ω截面密封环旋压成形装置

Also Published As

Publication number Publication date
CH536148A (de) 1973-04-30
JPS4946709B1 (enExample) 1974-12-11
ZA712838B (en) 1972-01-26
GB1326505A (en) 1973-08-15
DE2116967A1 (de) 1971-11-25
CA938779A (en) 1973-12-25
BE766635A (fr) 1971-10-01

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