CN113245856A - Manufacturing process of U-shaped heat exchange tube - Google Patents
Manufacturing process of U-shaped heat exchange tube Download PDFInfo
- Publication number
- CN113245856A CN113245856A CN202110489470.9A CN202110489470A CN113245856A CN 113245856 A CN113245856 A CN 113245856A CN 202110489470 A CN202110489470 A CN 202110489470A CN 113245856 A CN113245856 A CN 113245856A
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- rollers
- pair
- heat exchange
- exchange tube
- saponification
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000007127 saponification reaction Methods 0.000 claims abstract description 37
- 238000000034 method Methods 0.000 claims abstract description 31
- 239000002253 acid Substances 0.000 claims abstract description 23
- 238000005554 pickling Methods 0.000 claims abstract description 23
- 238000005097 cold rolling Methods 0.000 claims abstract description 22
- 238000005461 lubrication Methods 0.000 claims abstract description 15
- 230000003647 oxidation Effects 0.000 claims abstract description 12
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 12
- 238000000137 annealing Methods 0.000 claims abstract description 7
- 238000005520 cutting process Methods 0.000 claims abstract description 5
- 238000001514 detection method Methods 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 56
- 239000010959 steel Substances 0.000 claims description 56
- 238000010438 heat treatment Methods 0.000 claims description 19
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 16
- 238000004080 punching Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000010622 cold drawing Methods 0.000 claims description 7
- 238000010008 shearing Methods 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 4
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 4
- 239000011790 ferrous sulphate Substances 0.000 claims description 4
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 4
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 claims description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 239000011574 phosphorus Substances 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- 238000010923 batch production Methods 0.000 abstract 1
- 241000270295 Serpentes Species 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
- B23P23/06—Metal-working plant comprising a number of associated machines or apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
-
- 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
- B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
- B21D3/02—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0071—Levelling the rolled product
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Thermal Sciences (AREA)
- Optics & Photonics (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a manufacturing process of a U-shaped heat exchange tube, which comprises the following process steps: blanking → rapid perforation → acid pickling phosphorization saponification lubrication → cold rolling → non-oxidation annealing → acid pickling phosphorization saponification lubrication → cold rolling → non-oxidation normalizing → multipoint straightening → head and tail cutting length → eddy current and ultrasonic flaw detection. By adopting the manufacturing process, the U-shaped heat exchange tubes with the outer diameter of 19.05mm multiplied by the thickness of 2.11mm multiplied by the length of 32m can be obtained in batch production, and the mechanical property of the heat exchange tubes can meet the following requirements: the tensile strength is more than or equal to 325MPa, the yield strength is more than or equal to 180MPa, the elongation is more than or equal to 35 percent, and the Rockwell hardness HRB is less than or equal to 72.
Description
Technical Field
The invention relates to the field of pipe machining processes, in particular to a manufacturing process of a U-shaped heat exchange pipe.
Background
The prior unbent U-shaped heat exchange tube with the outer diameter of 19.05mm, the thickness of 2.11mm and the length of 32m needs to meet the following requirements on mechanical properties: the tensile strength is more than or equal to 325MPa, the yield strength is more than or equal to 180MPa, the elongation is more than or equal to 35 percent, and the Rockwell hardness HRB is less than or equal to 72. The heat exchange tube is very long and has high mechanical property requirement, so the heat exchange tube is difficult to process by adopting the existing processing technology.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the manufacturing process of the U-shaped heat exchange tube can be used for producing the U-shaped heat exchange tube with the mechanical property meeting the requirement, the outer diameter of 19.05mm, the thickness of 2.11mm and the length of 32m in batches.
In order to solve the problems, the technical scheme adopted by the invention is as follows: a manufacturing process of a U-shaped heat exchange tube comprises the following process steps: blanking → rapid perforation → acid pickling phosphorization saponification lubrication → cold rolling → non-oxidation annealing → acid pickling phosphorization saponification lubrication → cold rolling → non-oxidation normalizing → multipoint straightening → head and tail cutting length → eddy current and ultrasonic flaw detection; the method is characterized in that:
(1) in the blanking process: preparing a round steel blank, wherein the steel number of the round steel blank is SA179, and the diameter of the round steel blank is phi 50mm, and shearing the round steel blank into sections on a shearing machine to obtain a section of round steel with the length of 1800 mm;
(2) in the rapid perforation: heating round steel in a heating furnace, firstly, preserving heat of the round steel at 800 +/-10 ℃ for 18-22 minutes for preheating, then uniformly heating the round steel from 800 +/-10 ℃ to 1250 +/-10 ℃ for 13-17 minutes, and preserving heat at 1250 +/-10 ℃ for 4-6 minutes, thereby ensuring the temperature consistency of the exterior of the round steel and the core part; the method comprises the following steps that (1) punching is immediately carried out on a punching machine set after round steel is taken out of a furnace so as to obtain a steel pipe, the size of the steel pipe is 51mm in outer diameter, 3.8mm in thickness and 6200mm in length, in the punching process, the temperature of the round steel is kept between 1150 and 1200 ℃, and the rolling speed is 0.8 +/-0.05 m/s, so that the fact that the 1800mm round steel is manufactured into the 6200mm long steel pipe in 8 seconds can be guaranteed;
(3) cold rolling twice to replace the cold drawing process;
(4) in the multipoint straightening: adopt seventeen roller straightener to straighten U type heat exchange tube, be provided with eight pairs of rollers of arranging along the fore-and-aft direction in the seventeen roller straightener, every pair of rollers comprises two rollers, eight pairs of rollers are respectively in proper order after the forward: the first pair of rollers, the second pair of rollers, the third pair of rollers, the fourth pair of rollers, the fifth pair of rollers, the sixth pair of rollers, the seventh pair of rollers and the eighth pair of rollers are used for guiding the U-shaped heat exchange tube to advance, the third pair of rollers, the fourth pair of rollers and the fifth pair of rollers are adjusted to be hyperbolic to plastically deform the U-shaped heat exchange tube, the sixth pair of rollers and the seventh pair of rollers are used for ensuring the straightness of the U-shaped heat exchange tube, and the eighth pair of rollers are used as outlet guide rollers.
Further, in the manufacturing process of the U-shaped heat exchange tube, the following steps are performed: in the non-oxidation annealing: the temperature of the heat treatment furnace is 800-820 ℃, and the heat treatment time is 45 +/-5 minutes.
Further, in the manufacturing process of the U-shaped heat exchange tube, the following steps are performed: cold rolling is carried out on a two-roll cold mill.
Further, in the manufacturing process of the U-shaped heat exchange tube, the following steps are performed: in the phosphorus washing saponification lubrication: placing the steel pipe for 24 hours, and then carrying out acid pickling, phosphorization and saponification treatment, wherein the acid pickling comprises the following steps: the concentration of the sulfuric acid is 3-16%, the content of ferrous sulfate in the sulfuric acid is less than or equal to 280g/L, the temperature of an acid cylinder is 40-60 ℃, and the pickling time is 30-50 minutes; after being cleaned by a clean water cylinder, phosphorizing, wherein the total acidity of the phosphorizing liquid is 15-45 drop, the free acidity is 0.3-1.5 drop, the temperature of the phosphorizing cylinder is 60-75 ℃, and the phosphorizing time is 20-40 minutes; and cleaning the mixture by using a clean water cylinder, and then saponifying the mixture, wherein the pH value of a saponification cylinder is 7.5-9, the temperature of the saponification cylinder is 60-80 ℃, and the saponification time is 6-10 minutes.
Further, in the manufacturing process of the U-shaped heat exchange tube, the following steps are performed: in saponification lubrication: the pH value of the saponification cylinder is 7.5-9, the temperature of the saponification cylinder is 60-80 ℃, and the saponification time is 6-10 minutes.
The invention has the advantages that: the manufacturing process can be used for producing the U-shaped heat exchange tubes with the outer diameter of 19.05mm, the thickness of 2.11mm and the length of 32m in batch, and the mechanical properties of the heat exchange tubes can meet the following requirements: the tensile strength is more than or equal to 325MPa, the yield strength is more than or equal to 180MPa, the elongation is more than or equal to 35 percent, and the Rockwell hardness HRB is less than or equal to 72.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
A manufacturing process of a U-shaped heat exchange tube comprises the following process steps: blanking → rapid perforation → acid pickling phosphorization saponification lubrication → cold rolling → non-oxidation annealing → acid pickling phosphorization saponification lubrication → cold rolling → non-oxidation normalizing → multipoint straightening → head and tail cutting length → eddy current and ultrasonic flaw detection;
(1) in the blanking process: preparing a round steel blank, wherein the steel number of the round steel blank is SA179, and the diameter of the round steel blank is phi 50mm, and shearing the round steel blank into sections on a shearing machine to obtain a section of round steel with the length of 1800 mm;
(2) in the rapid perforation: heating the round steel in a heating furnace, firstly preserving the heat of the round steel for 20 minutes at 800 ℃ for preheating, then uniformly heating the round steel to 1250 ℃ from 800 ℃, wherein the heating time is 15 minutes, and then preserving the heat for 5 minutes at 1250 ℃, thereby ensuring the temperature consistency of the outer part and the core part of the round steel; the method comprises the following steps that (1) punching is immediately carried out on a punching machine set after round steel is taken out of a furnace so as to obtain a steel pipe, the size of the steel pipe is 51mm in outer diameter, 3.8mm in thickness and 6200mm in length, the temperature of the round steel is kept between 1150 and 1200 ℃ in the punching process, and the rolling speed is 0.8 m/s, so that the round steel with the length of 1800mm can be made into the steel pipe with the length of 6200mm in 8 seconds; the rapid perforation process designed for the ultra-long heat exchange tube solves the phenomenon of local transverse cracking of the steel tube caused by too large temperature difference between the front and the rear in the perforation process;
(3) acid pickling, phosphorization, saponification and lubrication: placing the steel pipe for 24 hours, and then carrying out acid pickling, phosphorization and saponification treatment, wherein the acid pickling comprises the following steps: the concentration of the sulfuric acid is 3-16%, the content of ferrous sulfate in the sulfuric acid is less than or equal to 280g/L, the temperature of an acid cylinder is 40-60 ℃, and the pickling time is 30-50 minutes; after being cleaned by a clean water cylinder, phosphorizing, wherein the total acidity of the phosphorizing liquid is 15-45 drop, the free acidity is 0.3-1.5 drop, the temperature of the phosphorizing cylinder is 60-75 ℃, and the phosphorizing time is 20-40 minutes; cleaning the mixture by a clean water cylinder, and then saponifying the mixture, wherein the pH value of a saponification cylinder is 7.5-9, the temperature of the saponification cylinder is 60-80 ℃, and the saponification time is 6-10 minutes;
(4) in the cold rolling: cold rolling is carried out on a two-roller cold rolling mill, and the size of the rolled steel pipe is 32mm in outside diameter, 2.8mm in thickness and 15m in length;
(5) in the non-oxidation annealing: the temperature of the heat treatment furnace is 800-820 ℃, and the heat treatment time is 45 +/-5 minutes;
(6) acid pickling, phosphorization, saponification and lubrication: placing the steel pipe for 24 hours, and then carrying out acid pickling, phosphorization and saponification treatment, wherein the acid pickling comprises the following steps: the concentration of the sulfuric acid is 3-16%, the content of ferrous sulfate in the sulfuric acid is less than or equal to 280g/L, the temperature of an acid cylinder is 40-60 ℃, and the pickling time is 30-50 minutes; after being cleaned by a clean water cylinder, phosphorizing, wherein the total acidity of the phosphorizing liquid is 15-45 drop, the free acidity is 0.3-1.5 drop, the temperature of the phosphorizing cylinder is 60-75 ℃, and the phosphorizing time is 20-40 minutes; cleaning the mixture by a clean water cylinder, and then saponifying the mixture, wherein the pH value of a saponification cylinder is 7.5-9, the temperature of the saponification cylinder is 60-80 ℃, and the saponification time is 6-10 minutes;
(7) in the cold rolling: cold rolling is carried out on a two-roller cold rolling mill, and the U-shaped heat exchange tube with the size of 19.05mm in outer diameter, 2.11mm in thickness and 32.5m in length is obtained after rolling;
(8) non-oxidation normalizing for U-shaped heat exchange tube in heating furnace
(9) In the multipoint straightening: adopt seventeen roller straightener to straighten U type heat exchange tube, be provided with eight pairs of rollers of arranging along the fore-and-aft direction in the seventeen roller straightener, every pair of rollers comprises two rollers, eight pairs of rollers are respectively in proper order after the forward: the first pair of rollers, the second pair of rollers, the third pair of rollers, the fourth pair of rollers, the fifth pair of rollers, the sixth pair of rollers, the seventh pair of rollers and the eighth pair of rollers are used for guiding the U-shaped heat exchange tube to advance, the third pair of rollers, the fourth pair of rollers and the fifth pair of rollers are adjusted to be hyperbolic to carry out plastic deformation on the U-shaped heat exchange tube, the sixth pair of rollers and the seventh pair of rollers are used for ensuring the straightness of the U-shaped heat exchange tube, and the eighth pair of rollers are used as outlet guide rollers, so that the layout mode can eliminate a small bend formed after the ultra-long U-shaped heat exchange tube is subjected to heat treatment, and the straightness of the U-shaped heat exchange tube is ensured to be 1/1000 mm;
(10) cutting the head and the tail to a fixed length to finally obtain a U-shaped heat exchange tube with the size of 19.05mm of outer diameter, 2.11mm of thickness and 32m of length;
(11) and carrying out eddy current and ultrasonic flaw detection on the U-shaped heat exchange tube.
The U-shaped heat exchange tube is required to be bent into a snake shape after being manufactured.
The invention replaces the cold drawing process by two times of cold rolling, if the traditional cold drawing process is adopted to manufacture the ultra-long pipe, the required groove body can exceed 24 meters in length for the acid pickling, phosphorization, saponification and lubrication process before cold drawing, and the method cannot be realized for many manufacturers. The problem can be well solved by secondary cold rolling, and the ultra-long pipe with the length of more than 32 meters can be produced only by a conventional tank body with the length of 18 meters. If the groove body can meet the requirement, the process pass can be subjected to cold drawing for 5 times, and the last 2 times are subjected to empty drawing, so that a large amount of phosphating solution and lubricant can be remained in the steel pipe and cannot be removed. The heat treatment of the final finished product can firmly adhere to the inner wall of the steel pipe, and the heat exchange efficiency is influenced. This does not occur in cold rolling. Compared with the cold drawing process, the manufacturing cost of the secondary cold rolling process is reduced by nearly 40 percent.
Claims (5)
1. A manufacturing process of a U-shaped heat exchange tube comprises the following process steps: blanking → rapid perforation → acid pickling phosphorization saponification lubrication → cold rolling → non-oxidation annealing → acid pickling phosphorization saponification lubrication → cold rolling → non-oxidation normalizing → multipoint straightening → head and tail cutting length → eddy current and ultrasonic flaw detection; the method is characterized in that:
(1) in the blanking process: preparing a round steel blank, wherein the steel number of the round steel blank is SA179, and the diameter of the round steel blank is phi 50mm, and shearing the round steel blank into sections on a shearing machine to obtain a section of round steel with the length of 1800 mm;
(2) in the rapid perforation: heating round steel in a heating furnace, firstly, preserving heat of the round steel at 800 +/-10 ℃ for 18-22 minutes for preheating, then uniformly heating the round steel from 800 +/-10 ℃ to 1250 +/-10 ℃ for 13-17 minutes, and preserving heat at 1250 +/-10 ℃ for 4-6 minutes, thereby ensuring the temperature consistency of the exterior of the round steel and the core part; the method comprises the following steps that (1) punching is immediately carried out on a punching machine set after round steel is taken out of a furnace so as to obtain a steel pipe, the size of the steel pipe is 51mm in outer diameter, 3.8mm in thickness and 6200mm in length, in the punching process, the temperature of the round steel is kept between 1150 and 1200 ℃, and the rolling speed is 0.8 +/-0.05 m/s, so that the fact that the 1800mm round steel is manufactured into the 6200mm long steel pipe in 8 seconds can be guaranteed;
(3) cold rolling twice to replace the cold drawing process;
(4) in the multipoint straightening: adopt seventeen roller straightener to straighten U type heat exchange tube, be provided with eight pairs of rollers of arranging along the fore-and-aft direction in the seventeen roller straightener, every pair of rollers comprises two rollers, eight pairs of rollers are respectively in proper order after the forward: the first pair of rollers, the second pair of rollers, the third pair of rollers, the fourth pair of rollers, the fifth pair of rollers, the sixth pair of rollers, the seventh pair of rollers and the eighth pair of rollers are used for guiding the U-shaped heat exchange tube to advance, the third pair of rollers, the fourth pair of rollers and the fifth pair of rollers are adjusted to be hyperbolic to plastically deform the U-shaped heat exchange tube, the sixth pair of rollers and the seventh pair of rollers are used for ensuring the straightness of the U-shaped heat exchange tube, and the eighth pair of rollers are used as outlet guide rollers.
2. A process for manufacturing a U-shaped heat exchange tube according to claim 1, wherein: in the non-oxidation annealing: the temperature of the heat treatment furnace is 800-820 ℃, and the heat treatment time is 45 +/-5 minutes.
3. A process for manufacturing a U-shaped heat exchange tube according to claim 1 or 2, wherein: cold rolling is carried out on a two-roll cold mill.
4. A process for manufacturing a U-shaped heat exchange tube according to claim 1 or 2, wherein: in the phosphorus washing saponification lubrication: placing the steel pipe for 24 hours, and then carrying out acid pickling, phosphorization and saponification treatment, wherein the acid pickling comprises the following steps: the concentration of the sulfuric acid is 3-16%, the content of ferrous sulfate in the sulfuric acid is less than or equal to 280g/L, the temperature of an acid cylinder is 40-60 ℃, and the pickling time is 30-50 minutes; after being cleaned by a clean water cylinder, phosphorizing, wherein the total acidity of the phosphorizing liquid is 15-45 drop, the free acidity is 0.3-1.5 drop, the temperature of the phosphorizing cylinder is 60-75 ℃, and the phosphorizing time is 20-40 minutes; and cleaning the mixture by using a clean water cylinder, and then saponifying the mixture, wherein the pH value of a saponification cylinder is 7.5-9, the temperature of the saponification cylinder is 60-80 ℃, and the saponification time is 6-10 minutes.
5. A process for manufacturing a U-shaped heat exchange tube according to claim 1 or 2, wherein: in saponification lubrication: the pH value of the saponification cylinder is 7.5-9, the temperature of the saponification cylinder is 60-80 ℃, and the saponification time is 6-10 minutes.
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| CN202110489470.9A CN113245856B (en) | 2021-05-06 | 2021-05-06 | Manufacturing process of U-shaped heat exchange tube |
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| CN202110489470.9A CN113245856B (en) | 2021-05-06 | 2021-05-06 | Manufacturing process of U-shaped heat exchange tube |
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| CN113245856B CN113245856B (en) | 2023-03-14 |
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