GB2127328A - Method of producing a bifurcated pipe junction - Google Patents

Method of producing a bifurcated pipe junction Download PDF

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Publication number
GB2127328A
GB2127328A GB08226631A GB8226631A GB2127328A GB 2127328 A GB2127328 A GB 2127328A GB 08226631 A GB08226631 A GB 08226631A GB 8226631 A GB8226631 A GB 8226631A GB 2127328 A GB2127328 A GB 2127328A
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GB
United Kingdom
Prior art keywords
tube
section
pipe
shaped cross
shaped
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.)
Granted
Application number
GB08226631A
Other versions
GB2127328B (en
Inventor
Peter Anthony Leslie Butler
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.)
Unipart Group Ltd
Original Assignee
Unipart Group 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 Unipart Group Ltd filed Critical Unipart Group Ltd
Priority to GB08226631A priority Critical patent/GB2127328B/en
Publication of GB2127328A publication Critical patent/GB2127328A/en
Application granted granted Critical
Publication of GB2127328B publication Critical patent/GB2127328B/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1838—Construction facilitating manufacture, assembly, or disassembly characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles
    • 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
    • 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
    • B21C37/28—Making tube fittings for connecting pipes, e.g. U-pieces
    • B21C37/29—Making branched pieces, e.g. T-pieces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F01N13/082—Other arrangements or adaptations of exhaust conduits of tailpipe, e.g. with means for mixing air with exhaust for exhaust cooling, dilution or evacuation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/22—Methods or apparatus for fitting, inserting or repairing different elements by welding or brazing

Abstract

To form a junction for example in, or for, a branched pipe for a vehicle exhaust system, a portion of tube between its ends is formed to a D-shaped cross section by flattening an arc of the tube section against an anvil, with an arcuate die. The tube is then cut through the arcuate section, and folded back about the unsevered flat section such that the flattened portions abut. Alternatively the tube is completely severed and the two parts are placed such that their flattened portions abut. The flattened portions are then connected, e.g. by welding, and the joined ends may then be telescoped in, and welded to, a junction pipe. <IMAGE>

Description

SPECIFICATION Method of producing bifurcated joints This invention relates to a method of producing a bifurcated pipe junction, and to pipe junctions produced by the method.
Bifurcated pipe junctions, such as are known for branched vehicle exhaust systems, have comprised two branch pipes each formed at one end to a "D" shaped cross section and welded together with the flattened portions of the D-shaped cross section abutting each other.
However in forming the D-shaped cross section at the end of each branch pipe, a length of pipe is placed in one half of a die set that reproduces the required shape of the branch pipe, and the other half of the die set is forced against the pipe to partly form the D-shaped end. This pressing operation distorts the flattened portion of the D-shaped section which must be straightened by inserting a plug whilst the pipe is still held in the die set.
It has now been found that if a D-shaped cross section is formed not at the end of each branch tube but in the middle of a length of tubing, not only can the length be cut to provide both branch tubes but also the tubes do not require the flattened portion of the D-shaped section to be straightened with a plug.
Thus according to the invention a method of producing a bifurcated pipe junction includes the steps of a) forming a portion of a tube between its ends to a D-shaped cross section by flattening a section of the tube against an anvil with an arcuate die; b) cutting through at least the arc of the Dshaped section; and c) joining the severed, or partly severed, parts of the tube together with the flattened sections abutting each other.
Moreover it has been found that if the tube is severed only through the arc of the D-shaped cross section, the two parts may then be bent across the unsevered flattened portion of the D-shaped section until the tube is in effect folded back on itself with the flattened portions abutting.
Thus according to another aspect of the invention the method includes only partially severing the tube and then bending the uncut flattened portion of the D-shaped section to fold the tube back on itself.
It should be understood that the angle of bifurcation can be predetermined by the choice of a suitable anvil plate. A flat anvil plate tends to produce an inward belling of the flat of the D-shaped cross section, thus making the cutting of the arcuate portion more difficult, and therefore an anvil plate having an inverted V-shape is generally better.
The invention also includes teiescoping the joined D-shaped ends into a tubular junction pipe, and the invention permits a parallel connector pipe to be readily telescoped over the assembly.
A method of producing a bifurcated pipe joint will now be described with reference to the accompanying drawings, in which: Figure 1 is a schematic view of a bifurcated pipe junction and allied junction pipe; Figure 2 is a schematic view of a tube about to be formed to a D-shaped cross section; and Figure 3 is a side view of a tube that has been formed and partially severed.
A length of tube 5 is formed to D-shaped cross section by flattening a section of the tube against an anvil 6 using an arcuate die block 7.
The arcuate cutout 8 of the die block 7 is forced towards the anvil 6 in a suitable press, and when the die block 7 bottoms-out against the anvil 6, the tube 5 has been formed to the shape shown in Figure 3.
The formed tube shown in Figure 3 is then partially severed by sawing through the arc of the D-shaped section, as indicated at 9, and the partially severed tube is folded back on itself to yield two branch pipes 1 as in Figure 1.
The branch pipes 1 are welded together at 3 and 4 and a junction pipe 2 is telescoped over the Dshaped ends of the branch pipes, and is circumferen tially welded thereon.
In a variation of the method described above the formed tube is cut right through, and the tubes are also welded together along the ends of the abutting flat portions of the D-shaped cross section.
1. A method of producing a bifurcated pipe junction which includes the steps of: a) forming a portion of a tube between its ends to a D-shaped cross section by flattening a section of the tube against an anvil with an arcuate die; b) cutting through at least the arc of the Dshaped section; and c) joining the severed, or partly severed, parts of the tube together with the flattened sections abutting each other.
2. A method as claimed in claim 1 which includes only partially severing the tube and then bending the uncut flattened portion of the D-shaped section to fold the tube back on itself.
3. A method as claimed in claim 1 or 2 in which the anvil plate is an inverted V-shape.
4. A method as claimed in claims 1,2 or 3 in which the joined D-shaped ends are telescoped in, and joined to, a tubular junction pipe.
5. A method of producing a bifurcated pipe junction substantially as hereinbefore described with reference to, and as iliustrated in, the accompanying drawings.
6. A bifurcated pipe junction produced by the method claimed in any one of the preceding claims.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Method of producing bifurcated joints This invention relates to a method of producing a bifurcated pipe junction, and to pipe junctions produced by the method. Bifurcated pipe junctions, such as are known for branched vehicle exhaust systems, have comprised two branch pipes each formed at one end to a "D" shaped cross section and welded together with the flattened portions of the D-shaped cross section abutting each other. However in forming the D-shaped cross section at the end of each branch pipe, a length of pipe is placed in one half of a die set that reproduces the required shape of the branch pipe, and the other half of the die set is forced against the pipe to partly form the D-shaped end. This pressing operation distorts the flattened portion of the D-shaped section which must be straightened by inserting a plug whilst the pipe is still held in the die set. It has now been found that if a D-shaped cross section is formed not at the end of each branch tube but in the middle of a length of tubing, not only can the length be cut to provide both branch tubes but also the tubes do not require the flattened portion of the D-shaped section to be straightened with a plug. Thus according to the invention a method of producing a bifurcated pipe junction includes the steps of a) forming a portion of a tube between its ends to a D-shaped cross section by flattening a section of the tube against an anvil with an arcuate die; b) cutting through at least the arc of the Dshaped section; and c) joining the severed, or partly severed, parts of the tube together with the flattened sections abutting each other. Moreover it has been found that if the tube is severed only through the arc of the D-shaped cross section, the two parts may then be bent across the unsevered flattened portion of the D-shaped section until the tube is in effect folded back on itself with the flattened portions abutting. Thus according to another aspect of the invention the method includes only partially severing the tube and then bending the uncut flattened portion of the D-shaped section to fold the tube back on itself. It should be understood that the angle of bifurcation can be predetermined by the choice of a suitable anvil plate. A flat anvil plate tends to produce an inward belling of the flat of the D-shaped cross section, thus making the cutting of the arcuate portion more difficult, and therefore an anvil plate having an inverted V-shape is generally better. The invention also includes teiescoping the joined D-shaped ends into a tubular junction pipe, and the invention permits a parallel connector pipe to be readily telescoped over the assembly. A method of producing a bifurcated pipe joint will now be described with reference to the accompanying drawings, in which: Figure 1 is a schematic view of a bifurcated pipe junction and allied junction pipe; Figure 2 is a schematic view of a tube about to be formed to a D-shaped cross section; and Figure 3 is a side view of a tube that has been formed and partially severed. A length of tube 5 is formed to D-shaped cross section by flattening a section of the tube against an anvil 6 using an arcuate die block 7. The arcuate cutout 8 of the die block 7 is forced towards the anvil 6 in a suitable press, and when the die block 7 bottoms-out against the anvil 6, the tube 5 has been formed to the shape shown in Figure 3. The formed tube shown in Figure 3 is then partially severed by sawing through the arc of the D-shaped section, as indicated at 9, and the partially severed tube is folded back on itself to yield two branch pipes 1 as in Figure 1. The branch pipes 1 are welded together at 3 and 4 and a junction pipe 2 is telescoped over the Dshaped ends of the branch pipes, and is circumferen tially welded thereon. In a variation of the method described above the formed tube is cut right through, and the tubes are also welded together along the ends of the abutting flat portions of the D-shaped cross section. CLAIMS
1. A method of producing a bifurcated pipe junction which includes the steps of: a) forming a portion of a tube between its ends to a D-shaped cross section by flattening a section of the tube against an anvil with an arcuate die; b) cutting through at least the arc of the Dshaped section; and
c) joining the severed, or partly severed, parts of the tube together with the flattened sections abutting each other.
2. A method as claimed in claim 1 which includes only partially severing the tube and then bending the uncut flattened portion of the D-shaped section to fold the tube back on itself.
3. A method as claimed in claim 1 or 2 in which the anvil plate is an inverted V-shape.
4. A method as claimed in claims 1,2 or 3 in which the joined D-shaped ends are telescoped in, and joined to, a tubular junction pipe.
5. A method of producing a bifurcated pipe junction substantially as hereinbefore described with reference to, and as iliustrated in, the accompanying drawings.
6. A bifurcated pipe junction produced by the method claimed in any one of the preceding claims.
GB08226631A 1982-09-17 1982-09-17 Method of producing a bifurcated pipe junction Expired GB2127328B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08226631A GB2127328B (en) 1982-09-17 1982-09-17 Method of producing a bifurcated pipe junction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08226631A GB2127328B (en) 1982-09-17 1982-09-17 Method of producing a bifurcated pipe junction

Publications (2)

Publication Number Publication Date
GB2127328A true GB2127328A (en) 1984-04-11
GB2127328B GB2127328B (en) 1986-02-26

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Application Number Title Priority Date Filing Date
GB08226631A Expired GB2127328B (en) 1982-09-17 1982-09-17 Method of producing a bifurcated pipe junction

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GB (1) GB2127328B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0522282A1 (en) * 1991-07-10 1993-01-13 Gesellschaft für Innenhochdruckverfahren mbH &amp; Co.KG Joint for hollow articles and method for their manufacture
GB2312720A (en) * 1996-04-30 1997-11-05 Calsonic Corp Structure for coupling pipe with breeches pipe

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB787329A (en) * 1954-07-01 1957-12-04 Vickers Electrical Co Ltd Improvements relating to the construction of wave-guides

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB787329A (en) * 1954-07-01 1957-12-04 Vickers Electrical Co Ltd Improvements relating to the construction of wave-guides

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0522282A1 (en) * 1991-07-10 1993-01-13 Gesellschaft für Innenhochdruckverfahren mbH &amp; Co.KG Joint for hollow articles and method for their manufacture
GB2312720A (en) * 1996-04-30 1997-11-05 Calsonic Corp Structure for coupling pipe with breeches pipe
GB2312720B (en) * 1996-04-30 1998-01-14 Calsonic Corp Structure and method for coupling pipe with breeches pipe
US5901988A (en) * 1996-04-30 1999-05-11 Calsonic Corporation Structure for coupling pipe with breeches pipe

Also Published As

Publication number Publication date
GB2127328B (en) 1986-02-26

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PCNP Patent ceased through non-payment of renewal fee