CN109848245A - A kind of production method of integrally finned tubes - Google Patents
A kind of production method of integrally finned tubes Download PDFInfo
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- CN109848245A CN109848245A CN201811257268.8A CN201811257268A CN109848245A CN 109848245 A CN109848245 A CN 109848245A CN 201811257268 A CN201811257268 A CN 201811257268A CN 109848245 A CN109848245 A CN 109848245A
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Abstract
A kind of production method of integrally finned tubes, comprising the following steps: (1) blank is processed: carrying out sawing, lathe process and outer surface to forging light base round steel and polish, and processes inner hole using depth drill；(2) blank preheats: blank preheating is preheated using cabinet-type electric furnace or annular furnace, and preheating temperature is 800~900 DEG C, and soaking time is not less than 2 hours；(3) induction heating: carrying out the heating of blank using Intermediate Frequency Induction Heating Equipment, and heating temperature is 1220-1250 DEG C, and heat preservation is come out of the stove for 3-5 minute, and temperature, which measures, is subject to blank head central temperature.The beneficial effects of the invention are as follows the integrally finned tubes surface quality produced using the technique is good, dimension control is within the error range, and pass through physico-chemical analysis and Mechanics Performance Testing, performance indicator meets technical requirements, and total quality has reached relevant criterion or demand of technical standard；Product produced by the invention can be applied to some special industries, can be produced in batches, such as boiler heat exchange pipe etc..
Description
Technical field
The present invention relates to the manufacturing method technical fields of steel tubes, and in particular to a kind of producer of integrally finned tubes
Method.
Background technique
Integrally finned tubes is a kind of New-type boiler heat exchange pipe that Shell Co. Ltd developed in recent years, is mainly used for making
Make heat exchange pipe in boiler.Before this kind of integrally finned tubes occurs, heat exchange pipe is using welding lath production among round tube
Made of, there will be a large amount of weld seams in this way on tubing, inevitably generate welding residual stress, so as to cause
Occurs damaged danger in the reduction and use process of service life.
Root is the data shows that current Europe carries out this kind of integrally finned tubes production using machine-tooled method, and the country is not
See this kind of finned tube correlation report.Hot extrusion+cold-drawing technology production integrally finned tubes, is guaranteeing surface quality, dimensional accuracy
Under the premise of structure property, a large amount of metal material can also be saved compared with process for machining, while production can be greatly improved
Efficiency is suitable for producing in batches.But there is also many difficult points for this forming method: tool and mould design, heating process, lubrication effect
Fruit, drawing process etc. all need conscientiously to study and design just the dimensional accuracy and excellent performance that can guarantee product.
Summary of the invention
The purpose of the present invention is to provide a kind of production methods of integrally finned tubes, to solve to propose in above-mentioned background technique
The problem of.
To achieve the above object, the invention provides the following technical scheme:
A kind of production method of integrally finned tubes, comprising the following steps:
(1) blank is processed: sawing is carried out to forging light base round steel, lathe process and outer surface polish, using depth drill plus
Work inner hole；
(2) blank preheats: blank preheating is preheated using cabinet-type electric furnace or annular furnace, and preheating temperature is 800~900
DEG C, soaking time is not less than 2 hours；
(3) induction heating: carrying out the heating of blank using Intermediate Frequency Induction Heating Equipment, and heating temperature is 1220-1250 DEG C,
Heat preservation is come out of the stove for 3-5 minute, and temperature, which measures, is subject to blank head central temperature；
(4) tool and mould prepares: using the pass of Specialty Design fin tube heat extrusion die identical with finned tube shape, wing
The pass of piece tube hot-extrusion die has the water conservancy diversion camber line of gradual change, and is internally provided with hot extrusion plug；
(5) it lubricates: roller applications being used to the outer surface of blank, blank outer surface is made to obtain effectively lubricating；Hot extrusion core
Lubrication between stick and blank inner hole is lubricated using glass powder pad；
(6) hot extrusion molding, technological parameter hot extrusion: are carried out using 63MN horizontal extruder are as follows: extrusion ratio 23.5 is squeezed
Press speed 120mm/S, extruding force theoretical calculation 18.6MN；
(7) cooling: it is cooling to enter water after squeezing out for stainless steel finned tube rapidly；Carbon steel or low alloy steel finned tube is adopted
It is cooled down with air-cooled mode；
(8) it tests in advance: examining the surface quality for squeezing out channel steel and measure its size；
(9) it is heat-treated: solution heat treatment being used for stainless steel finned tube, solution heat treatment is heat-treated at Continuous Roller bottom
It is carried out in furnace；
(10) straightening: the finned tube after heat treatment is carried out using homemade simple straightening tooling cooperation Tube Drawing equipment
It is straightened, positive twist；
(11) it is surface-treated: stainless steel finned tube being surface-treated by the way of pickling, concrete measure: being utilized
Pickling is carried out to stainless steel channel steel in the nitration mixture that nitric acid and hydrofluoric acid are prepared, removes the oxide skin on surface；For carbon steel or low conjunction
Golden steel finned tube is using interior sandblasting, the oxide skin on the method removal surface of outer ball blast；
(12) reconditioning: reconditioning carries out reconditioning to the defect for influencing cold-drawn quality using hand-held grinding wheel；
(13) drawing: finned tube surfaces externally and internally is uniformly coated butter lime and is lubricated before drawing, using Soviet Union's draw out method
The drawing on steel pipe cold；
(14) it is heat-treated: solution heat treatment being used for stainless steel finned tube, solution heat treatment is at the heat of Continuous Roller bottom
It is carried out in reason furnace, heat treatment process are as follows: 1110~1170 DEG C of holding temperature, soaking time 30 minutes, spray water cooling；For carbon steel
Or low-alloy steel finned tube can require to carry out the heat treatment such as normalizing or annealing according to user performance；
(15) it is surface-treated: stainless steel finned tube being surface-treated by the way of pickling, concrete measure: being utilized
Pickling is carried out to stainless steel channel steel in the nitration mixture that nitric acid and hydrofluoric acid are prepared, removes the oxide skin on surface；For carbon steel or low conjunction
Golden steel finned tube is using interior sandblasting, the oxide skin on the method removal surface of outer ball blast；
(16) it examines: examining surface quality, size and the mechanical property and physicochemical property of finished product finned tube.
It is as a further solution of the present invention: the technique requirement in the step (1) are as follows: technique requirement: processed throwing
Smooth outer surface zero defect after light, rugosity≤2.0 μm；Sawing rear end face cuts gradient≤5mm；Blank head after lathe process falls
Outer circle arc angle is R20-25mm, and the tail portion arc angle of falling outer circle is R10mm, outer diameter φ 179mm, long 500-800mm, diameter of bore
45mm。
As the present invention, further scheme is: the pass of the fin tube heat extrusion die is shape outside finned tube
Shape is provided at fin tube heat extrusion die center and keeps the molding hot extrusion plug of finned tube centre bore.
As the present invention, further scheme is: the technique requirement in step (9) are as follows: holding temperature 1110~1170
DEG C, soaking time 30 minutes, spray water cooling；Normalizing heat treatment, heat treatment process are carried out for carbon steel or low alloy steel finned tube
It is 950 ± 10 DEG C, keeps the temperature 30-60 minutes, it is air-cooled；
As the present invention, further scheme is: in step (13), the pass of drawing mould is shape outside finned tube
Shape.
The beneficial effects of the invention are as follows the integrally finned tubes surface quality produced using the technique is good, dimensional accuracy control
System within the error range, and passes through physico-chemical analysis and Mechanics Performance Testing, and performance indicator meets technical requirements, total quality
Relevant criterion or demand of technical standard are reached；Product produced by the invention can be applied to some special industries, can carry out batch
Production, such as boiler heat exchange pipe etc..
Detailed description of the invention
Fig. 1 is the structural schematic diagram of integrally finned tubes of the present invention；
Fig. 2 is the structural schematic diagram of fin tube heat extrusion die of the present invention；
Fig. 3 is the cross-sectional view of Fig. 2 of the present invention.
In figure: 1- fin tube heat extrusion die；2- hot extrusion plug.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Material: ASME SB407-N08800LC；
Trimmed size: φ 48*6.3mm；
Producing stainless steel channel steel by hot extrusion+cold-drawing technology, specific step is as follows:
Please refer to Fig. 1-Fig. 3, in the embodiment of the present invention, a kind of production method of integrally finned tubes, comprising the following steps:
(1) blank is processed: sawing is carried out to forging light base round steel, lathe process and outer surface polish, using depth drill plus
Work inner hole；Technique requirement: smooth outer surface zero defect, rugosity≤2.0 μm after processed polishing；Sawing rear end face cut gradient≤
5mm；The blank head arc angle of falling outer circle after lathe process is R20-25mm, and the tail portion arc angle of falling outer circle is R10mm, outer diameter φ
179mm, long 500-800mm, diameter of bore 45mm；
(2) blank preheats: blank preheating is preheated using cabinet-type electric furnace or annular furnace, and preheating temperature is 800~900
DEG C, soaking time is not less than 2 hours；
(3) induction heating: carrying out the heating of blank using Intermediate Frequency Induction Heating Equipment, and heating temperature is 1220-1250 DEG C,
Heat preservation is come out of the stove for 3-5 minute, and temperature, which measures, is subject to blank head central temperature；
(4) tool and mould prepares: using the pass of Specialty Design fin tube heat extrusion die 1 identical with finned tube shape,
The pass of fin tube heat extrusion die 1 has the water conservancy diversion camber line of gradual change, and is internally provided with hot extrusion plug 2；
(5) it lubricates: roller applications being used to the outer surface of blank, blank outer surface is made to obtain effectively lubricating, outer painting glass
Powder model GW8；Lubrication between hot extrusion plug 2 and blank inner hole is lubricated using glass powder pad, glass powder pad-type number
GD19；
(6) hot extrusion molding, technological parameter hot extrusion: are carried out using 63MN horizontal extruder are as follows: extrusion ratio 23.5 is squeezed
Press speed 120mm/S, extruding force theoretical calculation 18.6MN；The pass of the fin tube heat extrusion die is shape outside finned tube
Shape is provided at 1 center of fin tube heat extrusion die and keeps the molding hot extrusion plug 2 of finned tube centre bore；
(7) cooling: it is cooling to enter water after squeezing out for stainless steel finned tube rapidly；Carbon steel or low alloy steel finned tube is adopted
It is cooled down with air-cooled mode；
(8) it tests in advance: examining the surface quality for squeezing out channel steel and measure its size；
(9) it is heat-treated: solution heat treatment being used for stainless steel finned tube, solution heat treatment is heat-treated at Continuous Roller bottom
It is carried out in furnace；Technique requirement are as follows: 1110~1170 DEG C of holding temperature, soaking time 30 minutes, spray water cooling；For carbon steel or low
Steel alloy finned tube carries out normalizing heat treatment, and heat treatment process is 950 ± 10 DEG C, keeps the temperature 30-60 minutes, air-cooled；
(10) straightening: the finned tube after heat treatment is carried out using homemade simple straightening tooling cooperation Tube Drawing equipment
It is straightened, positive twist；
(11) it is surface-treated: stainless steel finned tube being surface-treated by the way of pickling, concrete measure: being utilized
Pickling is carried out to stainless steel channel steel in the nitration mixture that nitric acid and hydrofluoric acid are prepared, removes the oxide skin on surface；For carbon steel or low conjunction
Golden steel finned tube is using interior sandblasting, the oxide skin on the method removal surface of outer ball blast；
(12) reconditioning: reconditioning carries out reconditioning to the defect for influencing cold-drawn quality using hand-held grinding wheel；
(13) drawing: finned tube surfaces externally and internally is uniformly coated butter lime and is lubricated before drawing, using Soviet Union's draw out method
The drawing on steel pipe cold；The purpose of drawing is that the higher finished product finned tube of dimensional accuracy, the passage of drawing regard in order to obtain
The concrete specification of finished product finned tube carries out one or multi-channel；
(14) it is heat-treated: solution heat treatment being used for stainless steel finned tube, solution heat treatment is at the heat of Continuous Roller bottom
It is carried out in reason furnace, heat treatment process are as follows: 1110~1170 DEG C of holding temperature, soaking time 30 minutes, spray water cooling；For carbon steel
Or low-alloy steel finned tube can require to carry out the heat treatment such as normalizing or annealing according to user performance；
(15) it is surface-treated: stainless steel finned tube being surface-treated by the way of pickling, concrete measure: being utilized
Pickling is carried out to stainless steel channel steel in the nitration mixture that nitric acid and hydrofluoric acid are prepared, removes the oxide skin on surface；For carbon steel or low conjunction
Golden steel finned tube is using interior sandblasting, the oxide skin on the method removal surface of outer ball blast；
(16) it examines: examining surface quality, size and the mechanical property and physicochemical property of finished product finned tube.
In step (13), the pass of drawing mould is finned tube outer shape.
1 chemical component inspection result of table
2 mechanical properties test result of table
3 Huey test result of table (test method ASTM G28 A)
4 dimension control result of table (size code is shown in attached drawing 1)
Flattening test
Reference standard: ASME SA450, when spacing is less than 31.2mm between two pressing plates, being layered or opening do not occur in end face
It splits.
Flaring test
Reference standard: ASME Section II-SB 829, when flaring rate is more than the 30% of outer diameter, flaring end face does not go out
Now crack.Through examining, the surface quality of the N08800LC integrally finned tubes of production, dimensional accuracy, physicochemical property, mechanical property,
The indexs such as corrosion resisting property are all satisfied demand of technical standard.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (5)
1. a kind of production method of integrally finned tubes, which comprises the following steps:
(1) blank is processed: sawing is carried out to forging light base round steel, lathe process and outer surface polish, processed using depth drill in
Hole；
(2) blank preheats: blank preheating is preheated using cabinet-type electric furnace or annular furnace, and preheating temperature is 800~900 DEG C, is protected
The warm time is not less than 2 hours；
(3) induction heating: carrying out the heating of blank using Intermediate Frequency Induction Heating Equipment, and heating temperature is 1220-1250 DEG C, heat preservation
It comes out of the stove within 3-5 minutes, blank head central temperature is subject in temperature measurement；
(4) tool and mould prepares: using the pass of Specialty Design fin tube heat extrusion die (1) identical with finned tube shape, wing
The pass of piece tube hot-extrusion die (1) has the water conservancy diversion camber line of gradual change, and is internally provided with hot extrusion plug (2)；
(5) it lubricates: roller applications being used to the outer surface of blank, blank outer surface is made to obtain effectively lubricating；Hot extrusion plug (2)
Lubrication between blank inner hole is lubricated using glass powder pad；
(6) hot extrusion molding, technological parameter hot extrusion: are carried out using 63MN horizontal extruder are as follows: extrusion ratio 23.5 squeezes speed
Spend 120mm/S, extruding force theoretical calculation 18.6MN；
(7) cooling: it is cooling to enter water after squeezing out for stainless steel finned tube rapidly；For carbon steel or low alloy steel finned tube using empty
Cold mode is cooled down；
(8) it tests in advance: examining the surface quality for squeezing out channel steel and measure its size；
(9) it is heat-treated: solution heat treatment being used for stainless steel finned tube, solution heat treatment is in the heat-treatment furnace of Continuous Roller bottom
It carries out；
(10) straightening: the finned tube after heat treatment is drawn using homemade simple straightening tooling cooperation Tube Drawing equipment
Directly, positive twist；
(11) it is surface-treated: stainless steel finned tube being surface-treated by the way of pickling, concrete measure: utilizing nitric acid
Pickling is carried out to stainless steel channel steel in the nitration mixture prepared with hydrofluoric acid, removes the oxide skin on surface；For carbon steel or low alloy steel
Finned tube is using interior sandblasting, the oxide skin on the method removal surface of outer ball blast；
(12) reconditioning: reconditioning carries out reconditioning to the defect for influencing cold-drawn quality using hand-held grinding wheel；
(13) drawing: finned tube surfaces externally and internally is uniformly coated butter lime and is lubricated before drawing, using Soviet Union's draw out method in steel
Drawing on pipe drawbench；
(14) it is heat-treated: solution heat treatment being used for stainless steel finned tube, solution heat treatment is in Continuous Roller bottom heat-treatment furnace
Middle progress, heat treatment process are as follows: 1110~1170 DEG C of holding temperature, soaking time 30 minutes, spray water cooling；For carbon steel or low
Steel alloy finned tube can require to carry out the heat treatment such as normalizing or annealing according to user performance；
(15) it is surface-treated: stainless steel finned tube being surface-treated by the way of pickling, concrete measure: utilizing nitric acid
Pickling is carried out to stainless steel channel steel in the nitration mixture prepared with hydrofluoric acid, removes the oxide skin on surface；For carbon steel or low alloy steel
Finned tube is using interior sandblasting, the oxide skin on the method removal surface of outer ball blast；
(16) it examines: examining surface quality, size and the mechanical property and physicochemical property of finished product finned tube.
2. a kind of production method of integrally finned tubes according to claim 1, which is characterized in that in the step (1)
Technique requirement are as follows: technique requirement: smooth outer surface zero defect, rugosity≤2.0 μm after processed polishing；Sawing rear end face cuts gradient
≤5mm；The blank head arc angle of falling outer circle after lathe process is R20-25mm, and the tail portion arc angle of falling outer circle is R10mm, outer diameter φ
179mm, long 500-800mm, diameter of bore 45mm.
3. a kind of production method of integrally finned tubes according to claim 1 or 2, which is characterized in that the fin tube heat
The pass of extrusion die is finned tube outer shape, be provided at fin tube heat extrusion die center keep finned tube centre bore at
The hot extrusion plug of type.
4. a kind of production method of integrally finned tubes according to claim 3, which is characterized in that the work in step (9)
Skill requirement are as follows: 1110~1170 DEG C of holding temperature, soaking time 30 minutes, spray water cooling；For carbon steel or low alloy steel fin
Pipe carries out normalizing heat treatment, and heat treatment process is 950 ± 10 DEG C, keeps the temperature 30-60 minutes, air-cooled.
5. a kind of production method of integrally finned tubes according to claim 4, which is characterized in that in step (13), draw
The pass of draft tool is finned tube outer shape.
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| CN201811257268.8A CN109848245A (en) | 2018-10-26 | 2018-10-26 | A kind of production method of integrally finned tubes |
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| CN201811257268.8A CN109848245A (en) | 2018-10-26 | 2018-10-26 | A kind of production method of integrally finned tubes |
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Family
ID=66889813
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022016710A1 (en) * | 2020-07-24 | 2022-01-27 | 浙江久立特材科技股份有限公司 | Cold drawing die and production process for ribbed cladding tube, and finished tube thereof |
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| CN103056180A (en) * | 2013-02-04 | 2013-04-24 | 山西太钢不锈钢股份有限公司 | Hot extrusion process of thin-walled 23000mm ultralong pipe |
| CN105935711A (en) * | 2016-07-10 | 2016-09-14 | 江苏凯宇不锈钢制品有限公司 | Preparation technology of stainless steel coil pipes |
| CN106583491A (en) * | 2016-12-23 | 2017-04-26 | 山西太钢不锈钢股份有限公司 | Method for manufacturing Cr-Ni-Mo-Nb nickel base alloy seamless tube |
| CN107537876A (en) * | 2017-09-14 | 2018-01-05 | 攀钢集团研究院有限公司 | A kind of production method of large-caliber thin-walled titanium seamless tubes |
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2018
- 2018-10-26 CN CN201811257268.8A patent/CN109848245A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1343798A (en) * | 2000-09-16 | 2002-04-10 | 江苏江河集团电力工程公司 | Centrifugal casting technology for manufacturing cold drawn seamless pipe of ultralow-carbon dual-phase stainless steel |
| CN103056180A (en) * | 2013-02-04 | 2013-04-24 | 山西太钢不锈钢股份有限公司 | Hot extrusion process of thin-walled 23000mm ultralong pipe |
| CN105935711A (en) * | 2016-07-10 | 2016-09-14 | 江苏凯宇不锈钢制品有限公司 | Preparation technology of stainless steel coil pipes |
| CN106583491A (en) * | 2016-12-23 | 2017-04-26 | 山西太钢不锈钢股份有限公司 | Method for manufacturing Cr-Ni-Mo-Nb nickel base alloy seamless tube |
| CN107537876A (en) * | 2017-09-14 | 2018-01-05 | 攀钢集团研究院有限公司 | A kind of production method of large-caliber thin-walled titanium seamless tubes |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022016710A1 (en) * | 2020-07-24 | 2022-01-27 | 浙江久立特材科技股份有限公司 | Cold drawing die and production process for ribbed cladding tube, and finished tube thereof |
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Application publication date: 20190607 |