WO2013175486A1 - Method for producing "bi-metal" (ferrous/non-ferrous) tube - Google Patents
Method for producing "bi-metal" (ferrous/non-ferrous) tube Download PDFInfo
- Publication number
- WO2013175486A1 WO2013175486A1 PCT/IN2013/000153 IN2013000153W WO2013175486A1 WO 2013175486 A1 WO2013175486 A1 WO 2013175486A1 IN 2013000153 W IN2013000153 W IN 2013000153W WO 2013175486 A1 WO2013175486 A1 WO 2013175486A1
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- WO
- WIPO (PCT)
- Prior art keywords
- tube
- ferrous metal
- production
- bimetallic tube
- ferrous
- Prior art date
Links
- 239000002184 metal Substances 0.000 title claims abstract description 46
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 46
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 53
- 229910000831 Steel Inorganic materials 0.000 claims description 29
- 239000010959 steel Substances 0.000 claims description 29
- 229910001369 Brass Inorganic materials 0.000 claims description 24
- 239000010951 brass Substances 0.000 claims description 24
- 238000013461 design Methods 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 3
- -1 ferrous metals Chemical class 0.000 description 10
- 238000012360 testing method Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000004141 dimensional analysis Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- QIVUCLWGARAQIO-OLIXTKCUSA-N (3s)-n-[(3s,5s,6r)-6-methyl-2-oxo-1-(2,2,2-trifluoroethyl)-5-(2,3,6-trifluorophenyl)piperidin-3-yl]-2-oxospiro[1h-pyrrolo[2,3-b]pyridine-3,6'-5,7-dihydrocyclopenta[b]pyridine]-3'-carboxamide Chemical compound C1([C@H]2[C@H](N(C(=O)[C@@H](NC(=O)C=3C=C4C[C@]5(CC4=NC=3)C3=CC=CN=C3NC5=O)C2)CC(F)(F)F)C)=C(F)C=CC(F)=C1F QIVUCLWGARAQIO-OLIXTKCUSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000010622 cold drawing Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000009658 destructive testing Methods 0.000 description 1
- XULSCZPZVQIMFM-IPZQJPLYSA-N odevixibat Chemical compound C12=CC(SC)=C(OCC(=O)N[C@@H](C(=O)N[C@@H](CC)C(O)=O)C=3C=CC(O)=CC=3)C=C2S(=O)(=O)NC(CCCC)(CCCC)CN1C1=CC=CC=C1 XULSCZPZVQIMFM-IPZQJPLYSA-N 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- B21C37/154—Making multi-wall tubes
-
- 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
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
- B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles
-
- 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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/051—Deforming double-walled bodies
-
- 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
- B21D39/04—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods
Definitions
- the present invention relates to bimetallic tubes and more particularly to a method of producing a bimetallic tube.
- Non-ferrous metal tubes are used in tandem due to their properties such as low weight, higher conductivity, non-magnetic property or resistance to corrosion and the like. However/these non-ferrous metals are highly expensive. Hence, use of bimetallic tubes is generally preferred in engineering applications where large economical savings in non-ferrous metals are required.
- the bimetallic tubes are generally made such that coating of ferrous metals is externally applied on the non-ferrous metals in order to save expensive non-ferrous metals. In comparison with the tubes that are made of a single alloy, the use of precious non- ferrous materials is reduced in the bimetallic tubes.
- bimetallic tubes known in the art normally have coating/ plating of ferrous metals applied externally on the surface of the non-ferrous metals.
- external coating or plating fails to offer longer life to the end product thereby making these bimetallic tubes functionally and economically inferior.
- An object of the present invention is to provide a bimetallic tube integrally made out of ferrous and non-ferrous metals to provide substantially high strength as well as end life.
- Yet another object of the present invention is to provide a bimetallic tube that is having a firm bonding between the ferrous and non-ferrous metals.
- the present invention provides a method of production of a bimetallic tube that is integrally made of a ferrous metal hollow and a non-ferrous metal hollow.
- the method of production of the bimetallic tube comprises sequential steps namely cleaning of an outer soaped surface of the ferrous metal hollow using a thinner, forming a partial cone of the ferrous metal hollow by a drawing process, positioning of the non-ferrous metal hollow over the ferrous metal hollow, carrying out a combined drawing process for obtaining an integrally formed bimetallic tube and expanding inner diameter of ferrous metal tube for the obtained bimetallic tube.
- the present invention describes a method of production a bimetallic tube (herein after referred to as "Bi-Metal Tube” and abbreviated as "Bi-MT”) that is integrally made of ferrous and non-ferrous metals.
- the non-ferrous metal selected is selected from brass, copper and the like.
- the ferrous metal is selected from steel, stainless steel and the like.
- the Bi-MT is produced by drawing or rolling on mandrel preferably with or without a bonding material such that a softer non-ferrous surface of the Bi-MT meets the purpose of a wearing surface and stronger steel meets the purpose of the backing material.
- the Bi-MT tube produced per the proposed method of production is mainly used in architectural and engineering context, preferably for use in railings, barriers, trusses, frames, bushes, and the like.
- the Bi-MT tube produced per the proposed method of production is having good aesthetics and strength.
- the Bi-MT is integrally made of a ferrous tube and a non-ferrous tube such that after production the outer surface of the Bi-MT tube is made of non-ferrous material and the inner surface is made of the ferrous material.
- the preferred method of production of the Bi-MT is a drawing process followed by a rolling process that is carried out to provide finished output size, with combination of both the non-ferrous and ferrous hollows.
- the Bi-MT is integrally made of a steel tube and a brass tube such that after production the outer surface of the Bi-MT tube is made of brass and the inner surface is made of steel.
- the method of production of the Bi-MT includes a first step of cleaning of an outer soaped surface of a steel hollow member by a thinner.
- a partial cone of the steel hollow is formed by a drawing process followed by positioning the brass hollow over the steel hollow.
- the drawing of the steel (ferrous metal) tube is done to suit brass (non -ferrous metal) tube inner diameter.
- a combined drawing process of both the hollows is carried out to obtain the Bi-MT tube.
- the inner steel hollow is having interference fit with brass tube.
- the combined drawing process- is carried out Hengli-30 machine preferably by a cold pilgering process.
- inner diameter (ID) of the Bi-MT is expanded by passing mandrel and keeping brass outer diameter same to obtain the Bi-MT tube of the present invention.
- ID expanding and mechanical bonding between the brass tube processes is carried out on a draw bench machine by a cold drawing process.
- the combined thickness of the Bi-MT ranges between 2.25 mm to 2.38 mm, wherein the overall thickness of the bimetal tube is distributed in 20% of brass and 80%> of steel.
- a die used in the drawing process for forming the Bi-MT is preferably of ring type having a parabolic curved design.
- a mandrel used in the drawing processes of parabolic curved design is about 75.6 % and 67.24% respectively.
- a brass hollow having dimensions 50.0mm x 1.2mm was taken. Brass tube reduced to 46.7x1.49x43.75.
- a steel tube was of having dimensions 44.45 mm x 4 mm with 1020 grade was taken and reduced to 43.4x3.4x36.2.
- the steel hollow was soaped and cleaned by thinner only on an outer surface thereof.
- the brass hollow and the steel hollow were rolled on Hengli-30 machine by a cold pilgering process wherein a partial cone of steel hollow was formed in pilgering process and then the brass hollow was inserted over the steel tube. A combine pilgering of both hollows were done with strokes of 45 - 50 strokes and feed rate 2.00mm.
- a firm mechanical bonding between the brass and the steel hollows was established by cold pilgering process brass and steel tube together and expanding the outer diameter of the steel tube to achieve more interference fit and mechanical bonding.
- the finished output size of the Bi-MT, rolled with combination of both hollows, was 29.00 mm x 2.25mm wherein the finished tube outer brass tube was having dimension 29 mm x 0.45mm and the inner steel tube was having dimension 28.3 mm x 1.80mm.
- An overall dimension band was ranging from 28.85 mm to 29.00mm.
- a combined thickness observed was ranging between 2.25 mm to 2.38mm. Overall thickness of the Bi-MT was distributed in 20% of brass and 80% of steel. The Bi-MT so obtained was passed for internal diameter expansion.
- a die used in the drawing process was of ring type with curve design with an incoming size 50.8 mm and an outgoing size was 29.4 mm.
- a mandrel used was of curved design having dimension 33.00 mm x 23.75mm.lt was observed that, the total reduction on brass tube was 75.6 % and the total reduction on steel tube was 67.24%.
- a brass hollow having dimensions 50.8mm x 1.2mm was taken.
- a steel tube was of having dimensions 44.45 mm x 4 mm with 1020 grade was taken.
- the steel hollow was soaped and cleaned by thinner only on an outer surface thereof.
- the brass hollow and the steel hollow were rolled on Hengli-30 machine by a cold pilgering process wherein a partial cone of steel hollow was formed in pilgering process and then the brass hollow was inserted over the steel tube.
- a combine pilgering of both hollows were done with strokes of 45 - 50 strokes and feed rate 2.00mm.
- the finished output size of the Bi-MT, rolled with combination of both hollows, was 32.00 mm x 2.25mm.
- Overall thickness of the Bi-MT was distributed in 20% of brass and 80% of steel.
- a die used in the drawing process was of ring type with curve design with an incoming size 50.8 mm and an outgoing size was 29.4 mm.
- a mandrel used was of curved design
- the Bi-MT tube produced per the preferred method of the present invention was tested to analyze and ascertain that the chemical components are within prescribed limit. Accordingly, the Bi-MT tube, having an outer diameter of 83.00 mm, an inner diameter of 75.00 mm and a length of 4.15 meters, was taken for the chemical analysis.
- the Bi-MT tube produced per the preferred method of the present invention was analyzed to ascertain that the dimensional components of the Bi-MT tube were within prescribed limit. Accordingly, the Bi-MT tube, having an outer diameter of 83.00 mm, an inner diameter of 75.00 mm and a length of 4.15 meters, was taken for dimensional observations.
- the Bi-MT tube produced per the preferred method of the present invention was tested for no destructive testing (NDT)/ eddy current testing (ECT). Accordingly, the Bi-MT tube, having an outer diameter of 83.00 mm, an inner diameter of 75.00 mm and a length of 4.15 meters, was taken for the testing. Accordingly, various tests such as Hardness, Flaring Test, Flattening Test, Crushing Test, Yield Strength, Tensile strength and % Elongation were carried out.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Metal Extraction Processes (AREA)
- Laminated Bodies (AREA)
Abstract
The present invention discloses a method of production of a bimetallic tube that is integrally made of a ferrous metal hollow and a non- ferrous metal hollow. The method of production of the bimetallic tube emprises a plurality of sequential steps to carry out a combined drawing process of the ferrous metal hollow and the non-ferrous metal hollow to obtain an integrally formed bimetallic tube of the present invention.
Description
Method of Producing "Bi-Metal" (Ferrous / Non-Ferrous) Tube
Field of the invention
The present invention relates to bimetallic tubes and more particularly to a method of producing a bimetallic tube.
Background of the invention
Non-ferrous metal tubes are used in tandem due to their properties such as low weight, higher conductivity, non-magnetic property or resistance to corrosion and the like. However/these non-ferrous metals are highly expensive. Hence, use of bimetallic tubes is generally preferred in engineering applications where large economical savings in non-ferrous metals are required.
The bimetallic tubes are generally made such that coating of ferrous metals is externally applied on the non-ferrous metals in order to save expensive non-ferrous metals. In comparison with the tubes that are made of a single alloy, the use of precious non- ferrous materials is reduced in the bimetallic tubes.
However, the bimetallic tubes known in the art normally have coating/ plating of ferrous metals applied externally on the surface of the non-ferrous metals. However, such external coating or plating fails to offer longer life to the end product thereby making these bimetallic tubes functionally and economically inferior.
Accordingly, there exists a need of a bimetallic tube that overcomes all the drawbacks of the prior art.
Objects of the invention
An object of the present invention is to provide a bimetallic tube integrally made out of ferrous and non-ferrous metals to provide substantially high strength as well as end life.
Yet another object of the present invention is to provide a bimetallic tube that is having a firm bonding between the ferrous and non-ferrous metals.
Summary of the invention
Accordingly, the present invention provides a method of production of a bimetallic tube that is integrally made of a ferrous metal hollow and a non-ferrous metal hollow. The method of production of the bimetallic tube comprises sequential steps namely cleaning of an outer soaped surface of the ferrous metal hollow using a thinner, forming a partial cone of the ferrous metal hollow by a drawing process, positioning of the non-ferrous metal hollow over the ferrous metal hollow, carrying out a combined drawing process for obtaining an integrally formed bimetallic tube and expanding inner diameter of ferrous metal tube for the obtained bimetallic tube.
Detailed description of the invention
The foregoing objects of the present invention are accomplished and the problems and shortcomings associated with the prior art, techniques and approaches are overcome by the present invention as described below in the preferred embodiment.
The present invention describes a method of production a bimetallic tube (herein after referred to as "Bi-Metal Tube" and abbreviated as "Bi-MT") that is integrally made of ferrous and non-ferrous metals. In this one embodiment, the non-ferrous metal selected is selected from brass, copper and the like. In this one embodiment, the ferrous metal is selected from steel, stainless steel and the like. In accordance with a preferred embodiment of the present invention, the Bi-MT is produced by drawing or rolling on
mandrel preferably with or without a bonding material such that a softer non-ferrous surface of the Bi-MT meets the purpose of a wearing surface and stronger steel meets the purpose of the backing material. The Bi-MT tube produced per the proposed method of production is mainly used in architectural and engineering context, preferably for use in railings, barriers, trusses, frames, bushes, and the like. The Bi-MT tube produced per the proposed method of production is having good aesthetics and strength.
In accordance with a preferred method of production, the Bi-MT is integrally made of a ferrous tube and a non-ferrous tube such that after production the outer surface of the Bi-MT tube is made of non-ferrous material and the inner surface is made of the ferrous material. The preferred method of production of the Bi-MT is a drawing process followed by a rolling process that is carried out to provide finished output size, with combination of both the non-ferrous and ferrous hollows.
In an embodiment, the Bi-MT is integrally made of a steel tube and a brass tube such that after production the outer surface of the Bi-MT tube is made of brass and the inner surface is made of steel. Accordingly, the method of production of the Bi-MT includes a first step of cleaning of an outer soaped surface of a steel hollow member by a thinner. In a next step, a partial cone of the steel hollow is formed by a drawing process followed by positioning the brass hollow over the steel hollow. The drawing of the steel (ferrous metal) tube is done to suit brass (non -ferrous metal) tube inner diameter. In a further step, a combined drawing process of both the hollows is carried out to obtain the Bi-MT tube. In the combined drawing process, the inner steel hollow is having interference fit with brass tube. It is understood here that the combined drawing process- is carried out Hengli-30 machine preferably by a cold pilgering process. In a final step, inner diameter (ID) of the Bi-MT is expanded by passing mandrel and keeping brass outer diameter same to obtain the Bi-MT tube of the present invention. ID expanding and mechanical bonding between the brass tube processes is carried out on a draw bench machine by a cold drawing process.
In this one embodiment, the combined thickness of the Bi-MT ranges between 2.25 mm to 2.38 mm, wherein the overall thickness of the bimetal tube is distributed in 20% of brass and 80%> of steel. It is understood here that, a die used in the drawing process for forming the Bi-MT is preferably of ring type having a parabolic curved design. Also, a mandrel used in the drawing processes of parabolic curved design. In this one embodiment, the total reduction on brass tube and steel tube for forming the bimetal tube is about 75.6 % and 67.24% respectively.
EXAMPLES
EXAMPLE- 1 :
A brass hollow having dimensions 50.0mm x 1.2mm was taken. Brass tube reduced to 46.7x1.49x43.75. A steel tube was of having dimensions 44.45 mm x 4 mm with 1020 grade was taken and reduced to 43.4x3.4x36.2. The steel hollow was soaped and cleaned by thinner only on an outer surface thereof. The brass hollow and the steel hollow were rolled on Hengli-30 machine by a cold pilgering process wherein a partial cone of steel hollow was formed in pilgering process and then the brass hollow was inserted over the steel tube. A combine pilgering of both hollows were done with strokes of 45 - 50 strokes and feed rate 2.00mm. A firm mechanical bonding between the brass and the steel hollows was established by cold pilgering process brass and steel tube together and expanding the outer diameter of the steel tube to achieve more interference fit and mechanical bonding. The finished output size of the Bi-MT, rolled with combination of both hollows, was 29.00 mm x 2.25mm wherein the finished tube outer brass tube was having dimension 29 mm x 0.45mm and the inner steel tube was having dimension 28.3 mm x 1.80mm. An overall dimension band was ranging from 28.85 mm to 29.00mm. A combined thickness observed was ranging between 2.25 mm to 2.38mm. Overall thickness of the Bi-MT was distributed in 20% of brass and 80% of
steel. The Bi-MT so obtained was passed for internal diameter expansion. A die used in the drawing process was of ring type with curve design with an incoming size 50.8 mm and an outgoing size was 29.4 mm. A mandrel used was of curved design having dimension 33.00 mm x 23.75mm.lt was observed that, the total reduction on brass tube was 75.6 % and the total reduction on steel tube was 67.24%.
EXAMPLE-2
A brass hollow having dimensions 50.8mm x 1.2mm was taken. A steel tube was of having dimensions 44.45 mm x 4 mm with 1020 grade was taken. The steel hollow was soaped and cleaned by thinner only on an outer surface thereof. The brass hollow and the steel hollow were rolled on Hengli-30 machine by a cold pilgering process wherein a partial cone of steel hollow was formed in pilgering process and then the brass hollow was inserted over the steel tube. A combine pilgering of both hollows were done with strokes of 45 - 50 strokes and feed rate 2.00mm. The finished output size of the Bi-MT, rolled with combination of both hollows, was 32.00 mm x 2.25mm. Overall thickness of the Bi-MT was distributed in 20% of brass and 80% of steel. A die used in the drawing process was of ring type with curve design with an incoming size 50.8 mm and an outgoing size was 29.4 mm. A mandrel used was of curved design having dimension 33.00 mm x 24.5mm.
EXAMPLE- 3 : Chemical Analysis of the Bi-MT tube
The Bi-MT tube produced per the preferred method of the present invention was tested to analyze and ascertain that the chemical components are within prescribed limit. Accordingly, the Bi-MT tube, having an outer diameter of 83.00 mm, an inner diameter of 75.00 mm and a length of 4.15 meters, was taken for the chemical analysis.
Specification
(Max.) 0.22 1.6 0.55 0.025 0.025 — —
Specification
(Observed) 0.165 1.270 0.090 0.0040 0.0130 —■ 0.0450
It was observed that, the Bi-MT tube produced per the method of the present invention was having observed specification well below the maximum specification limits. Accordingly, the chemical component stability of the Bi-MT tube was ascertained EXAMPLE- 4: Dimensional Analysis of the Bi-MT tube
The Bi-MT tube produced per the preferred method of the present invention was analyzed to ascertain that the dimensional components of the Bi-MT tube were within prescribed limit. Accordingly, the Bi-MT tube, having an outer diameter of 83.00 mm, an inner diameter of 75.00 mm and a length of 4.15 meters, was taken for dimensional observations.
Table 2: Dimensional analysis data
It was observed that, the Bi-MT tube produced per the method of the present invention was having observed specification well within the minimum-maximum specification limits. Accordingly, the dimensional stability of the Bi-MT tube was ascertained
EXAMPLE- 5 : NDT / ECT testing of the Bi-MT tube
The Bi-MT tube produced per the preferred method of the present invention was tested for no destructive testing (NDT)/ eddy current testing (ECT). Accordingly, the Bi-MT tube, having an outer diameter of 83.00 mm, an inner diameter of 75.00 mm and a length of 4.15 meters, was taken for the testing. Accordingly, various tests such as Hardness, Flaring Test, Flattening Test, Crushing Test, Yield Strength, Tensile strength and % Elongation were carried out.
Table 2: Mechanical properties data
It was observed that, the tube undergone 100% NDT (ECT) testing and conforms to the standard.
The foregoing descriptions of specific embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the present invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the present invention and its practical application, to thereby enable others skilled in the art to best utilize the present invention and various embodiments with various modifications as are suited to the particular use contemplated. It is understood that
various omission and substitutions of equivalents are contemplated as circumstance may suggest or render expedient, but such are intended to cover the application or implementation without departing from the spirit or scope of the present invention.
Claims
1. A method for production of a bimetallic tube integrally made of a ferrous metal and a non-ferrous metal, the method of production of the bimetallic tube comprising steps of:
cleaning of an outer soaped surface of a ferrous metal hollow using a thinner; forming a partial cone of the ferrous metal hollow by a drawing process;
drawing ferrous metal tube to suit non -ferrous metal tube inner diameter;
positioning of a non-ferrous metal hollow over the ferrous metal hollow;
carrying out a combined drawing process to obtain an integrally formed bimetallic tube having a firm surface bonding between the non-ferrous metal hollow and the ferrous metal hollow; and
carrying out expanding the inner diameter of ferrous metal tube.
The method of production of the bimetallic tube as claimed in claim 1 , wherein the drawing process is a cold pilgering process that is carried out on a Hengli-30 drawing machine.
3. The method of production of the bimetallic tube as claimed in claim 1 , . wherein the ferrous metal hollow is made of steel.
The method of production of the bimetallic tube as claimed in claim 1 , wherein -ferrous metal hollow is made of brass.
5. The method of production of the bimetallic tube as claimed in claim 1 , wherein the bimetallic tube is having a combined thickness of about 2.25 mm to 2.38 mm.
6. The method of production of the bimetallic tube as claimed in claim 1 , wherein the bimetal tube is having an overall thickness in a range of about 15% of the non- ferrous metal and 85% of the ferrous metal.
7. The method of production of the bimetallic tube as claimed in claim 1 , wherein the combined drawing process utilizes a ring type die having a curved design.
8. The method of production of the bimetallic tube as claimed in claim 1 , wherein the combined drawing process utilizes a mandrel having a curved design.
9. The method of production of the bimetallic tube as claimed in claim 1 , wherein total reduction on the non-ferrous metal hollow is about 75.6 %.
10. The method of production of the bimetallic tube as claimed in claim 1 , wherein total reduction on the ferrous metal hollow is about 67.24%.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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IN663MU2012 | 2012-03-13 | ||
IN663/MUM/2012 | 2012-03-13 |
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WO2013175486A1 true WO2013175486A1 (en) | 2013-11-28 |
WO2013175486A8 WO2013175486A8 (en) | 2014-04-24 |
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JPS61283415A (en) * | 1985-06-07 | 1986-12-13 | Kawasaki Heavy Ind Ltd | Manufacture of wear resistant double pipe |
JPH01224113A (en) * | 1988-03-04 | 1989-09-07 | Nippon Steel Corp | Fitting method for circular pipe |
JPH11342419A (en) * | 1998-05-28 | 1999-12-14 | Nippon Steel Corp | Clad steel pipe manufacture by press roll piercing machine |
EP2377627A1 (en) * | 2010-03-15 | 2011-10-19 | Bundy Refrigeraçao Brasil Industria E Comércio LTDA. | A bimetallic tube, apparatus comprising such a tube and method of manufacturing an apparatus comprising a bimetallic tube |
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2013
- 2013-03-13 WO PCT/IN2013/000153 patent/WO2013175486A1/en active Application Filing
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US4125924A (en) * | 1977-04-04 | 1978-11-21 | United States Steel Corporation | Method of producing composite metal pipe |
JPS61283415A (en) * | 1985-06-07 | 1986-12-13 | Kawasaki Heavy Ind Ltd | Manufacture of wear resistant double pipe |
JPH01224113A (en) * | 1988-03-04 | 1989-09-07 | Nippon Steel Corp | Fitting method for circular pipe |
JPH11342419A (en) * | 1998-05-28 | 1999-12-14 | Nippon Steel Corp | Clad steel pipe manufacture by press roll piercing machine |
EP2377627A1 (en) * | 2010-03-15 | 2011-10-19 | Bundy Refrigeraçao Brasil Industria E Comércio LTDA. | A bimetallic tube, apparatus comprising such a tube and method of manufacturing an apparatus comprising a bimetallic tube |
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