CN114406616A - Seamless titanium vacuum cup welded pipe and production method thereof - Google Patents
Seamless titanium vacuum cup welded pipe and production method thereof Download PDFInfo
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- CN114406616A CN114406616A CN202210082025.5A CN202210082025A CN114406616A CN 114406616 A CN114406616 A CN 114406616A CN 202210082025 A CN202210082025 A CN 202210082025A CN 114406616 A CN114406616 A CN 114406616A
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- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 151
- 239000010936 titanium Substances 0.000 title claims abstract description 147
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 147
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 238000003466 welding Methods 0.000 claims abstract description 98
- 238000010622 cold drawing Methods 0.000 claims abstract description 62
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- 238000000137 annealing Methods 0.000 claims abstract description 40
- 238000004140 cleaning Methods 0.000 claims abstract description 20
- 239000002893 slag Substances 0.000 claims abstract description 9
- 238000007790 scraping Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 13
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- 238000001125 extrusion Methods 0.000 claims description 9
- 238000004321 preservation Methods 0.000 claims description 9
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 230000009467 reduction Effects 0.000 claims description 6
- 239000010953 base metal Substances 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 3
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- 238000007865 diluting Methods 0.000 claims description 2
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 abstract description 22
- 229910052786 argon Inorganic materials 0.000 abstract description 11
- 238000005520 cutting process Methods 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 3
- 231100000241 scar Toxicity 0.000 abstract description 2
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- 230000000052 comparative effect Effects 0.000 description 10
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- 238000009413 insulation Methods 0.000 description 6
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 5
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- YLZOPXRUQYQQID-UHFFFAOYSA-N 3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]propan-1-one Chemical compound N1N=NC=2CN(CCC=21)CCC(=O)N1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F YLZOPXRUQYQQID-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 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
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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Abstract
The invention discloses a production method of a seamless titanium thermos cup welded pipe, which comprises the steps of a, forming and welding; b, scarping and finishing; step c, sawing or cold-drawing; d, cleaning and annealing, and a step a of forming and welding: and (b) extruding and forming the titanium strip coil by using a forming roller, rapidly heating the edge of the strip by using high-frequency induction current, extruding and welding the edge by using an extruding roller, and scraping and finishing the scar in the step b: and c, the inner scarping knife and the outer scarping knife continuously scrape the extruded welding slag at the welding seam, and the finishing roller extrudes and corrects the roundness and straightness of the welded pipe so as to obtain a high-frequency induction welded titanium pipe, and the step c comprises the following steps of: the high-speed saw cutting machine cuts off the high-frequency induction welding titanium pipe along with the fixed length. The seamless titanium thermos cup welded pipe produced by the invention is a titanium welded pipe made by high-frequency induction welding, has high dimensional precision and good mechanical property, the production efficiency is improved by 10 times compared with seamless pipe making and argon arc welding pipe, the rapid preparation process route of the seamless titanium thermos cup pipe directly from a raw material coil is realized, and the production cost is greatly reduced.
Description
Technical Field
The invention relates to the technical field of titanium welded pipes, in particular to a seamless titanium vacuum cup welded pipe and a production method thereof.
Background
Titanium metal is added by consumers due to the properties of low density, light specific gravity, high hardness, no rustiness, slow heat transfer, biological affinity, bacteriostasis, sterilization, high-temperature oxidation coloring and the like, the vacuum cup made of pure titanium is provided with two modes of titanium plate drawing deformation and titanium pipe water expansion forming, the titanium plate drawing deformation has high requirement on the consistency of the transverse and longitudinal elongation of materials, the material loss is large and is about 35 percent, the titanium pipe water expansion forming can select a seamless titanium pipe and a welded titanium pipe, the seamless titanium pipe has multiple wall reduction procedures due to rolling and has high cost, the seamless titanium pipe is generally used for manufacturing a vacuum cup shell, the welded titanium pipe is manufactured by adopting a fusion welding process, and because a welding seam grain body is thick and has obvious color difference with a base material, the vacuum cup cannot eliminate a welding seam and cannot cover color difference even if surface treatment processes such as vacuum plating, anodic oxidation, surface sand blasting and the like are adopted, so the titanium metal is generally only used for an inner container, because the texture performance of the welding line and the heat affected zone is obviously changed compared with the base material, the pipe expansion rate is not more than 25% when water expands, otherwise deformation and rupture can occur, the welding line is easy to bulge and the heat affected zone is easy to dent due to different performances and hardness of the welding line, the heat affected zone and the base material when vacuumizing, the heat preservation performance is reduced due to incomplete vacuumizing, the heat preservation time is shortened, the vacuum degree and the heat preservation effect are gradually reduced due to the natural solidification connection of the welding line after a molten pool is formed, the heat transfer can not be isolated, and the cup body is scalded, if the seamless treatment is carried out by adopting the annealing and cold rolling process of the welded pipe, compared with the seamless pipe, the cost advantage is lost, therefore, no matter the titanium plate is subjected to drawing deformation or the seamless pipe and the argon arc welding pipe are subjected to water expansion forming, the process limitation and the cost pressure exist, and the titanium vacuum cup is difficult to produce in a large scale and popularize in a large scale.
Disclosure of Invention
In order to solve the problems in the background art, the invention aims to provide a welded pipe of a seamless titanium thermos cup and a production method thereof, which have the advantages of high dimensional precision of the welded pipe, good mechanical property and greatly reduced production cost, and solve the problems that the existing process has high processing cost, large weld grain bodies, obvious color difference with base metal, and easily generates weld bulge and heat affected zone recess and easily generates air holes and slag inclusion due to different performances and hardness of the weld, the heat affected zone and the base metal during vacuum pumping.
In order to achieve the purpose, the invention provides the following technical scheme: a production method of a seamless titanium thermos cup welded pipe comprises the steps of a, forming and welding; b, scarping and finishing; step c, sawing or cold-drawing; d, cleaning and annealing:
step a, forming and welding: the forming roll extrudes and forms the titanium strip coil, the high-frequency induction current rapidly heats the edge of the strip material, and the extrusion roll extrudes and welds the edge;
b, scaring and finishing: the inner scarping knife and the outer scarping knife continuously scrape the extruded welding slag at the welding seam, and the finishing roller extrudes and corrects the roundness and straightness of the welded pipe, so that the high-frequency induction welded titanium pipe is obtained;
step c, sawing or cold drawing: cutting off the high-frequency induction welding titanium pipe by a high-speed sawing machine along with a fixed length, and after inserting a wire and performing high-frequency induction welding on the contraction head of the titanium pipe, performing cold-drawing diameter-reducing molding on the large-diameter high-frequency induction welding titanium pipe to form a cold-drawing diameter-reducing pipe with a smaller diameter;
d, cleaning and annealing: the cold-drawn reducing pipe is subjected to ultrasonic cleaning, detection and drying through an ultrasonic cleaning machine and is sent into a channel type vacuum induction furnace for annealing, so that the tissues and the performances of the original welding line area and the heat affected area of the prepared seamless titanium welded pipe are more consistent with those of the parent metal, and the seamless titanium welded pipe is obtained after annealing treatment.
Preferably, in the step a, the titanium strip is formed and welded by a pure titanium strip of TA1 or TA2, the hole patterns of the forming roll and the extrusion roll are planned according to material properties, hardness, pipe diameter, wall thickness, cold deformation stress and the like, the forming roll and the extrusion roll are made of superhard materials with poor affinity with titanium element, the frequency and power of high-frequency induced current, the welding extrusion amount of the extrusion roll, the welding speed and the like are adjusted according to the properties of the titanium element, the thickness of the titanium strip, the pipe diameter of the formed pipe, and the like, the minimum welding speed is not lower than 60 m/min, and the formed welding seam and the heat affected zone are as narrow as possible.
Preferably, in the step b, the scarfing and the finishing are performed, the welding slag is a thin line-shaped projection formed by extruding the inner and outer superficial layer melts out of the welding seam when the heated edge is welded by the extrusion roller with the upsetting force, and the welding seam is a solid-phase metal close to or equal to the base metal after the welding slag is removed.
Preferably, in the step c, sawing or cold drawing is performed, the cold drawing is diameter-reducing cold drawing which does not reduce the wall and only uses a cold-drawing diameter-reducing outer die, the titanium vacuum cup is usually used with the pipe diameters of 45mm, 49mm, 51mm, 55mm, 57mm, 60mm, 65mm, 70mm, 80mm and 89mm, the wall thickness is 0.5mm, forming, welding and finishing dies are developed for each pipe diameter, the investment is too large, the time for replacing and debugging the dies of each specification is long, only dies of 60mm and 89mm are developed, wherein the dies of 60mm and 89mm do not need to be cold drawn, the dies can be used after cleaning and annealing, five pipe diameters of 45mm, 49mm, 51mm, 55mm and 57mm can be cold drawn from a mother pipe of 60mm in diameter, three pipe diameters of 65mm, 70mm and 80mm can be cold drawn from a mother pipe of 89mm in diameter, the welded pipe with the difference of the size and the pipe diameter of 30mm is reduced by at least one cold drawing, the welded pipe diameter of 30mm or more than two cold drawing times, and a special cold-drawing medium which is modulated according to the characteristics of low density, high specific strength, poor ductility, low thermal conductivity and the like of the titanium element is adopted during cold drawing, the maximum deformation of each pass is not more than 36.5 percent, and the speed is 15-30 m/min.
Preferably, in the step c, sawing or cold-drawing is performed, annealing is not required in the first cold-drawing pass, then, when the deformation of each pass is more than 30%, intermediate annealing is added once before cold-drawing again, and when the deformation of each pass is less than 20%, cold-drawing of one pass is added before annealing.
Preferably, in the step d, cleaning and annealing are performed, wherein the intermediate annealing is performed in an inert gas atmosphere at the temperature of 600-650 ℃ for 5-10 min.
Preferably, in the step d, cleaning and annealing are carried out, wherein ultrasonic cleaning is carried out by diluting a commercial heavy oil stain cleaning agent by 10 times, a diameter-reduced titanium welding tube is immersed into a cleaning pool, an ultrasonic probe is started to clean for 20-30 minutes when the temperature is increased to 45-50 ℃, the welding tube qualified in water pressure detection is dried, and the temperature is increased to 650 ℃ and the heat preservation time is 5-10 minutes when the vacuum annealing is carried out.
The invention further protects the seamless titanium thermos cup welded pipe manufactured by the production method.
Compared with the prior art, the invention has the following beneficial effects:
1. the seamless titanium vacuum cup welded pipe produced by the invention is a titanium welded pipe produced by high-frequency induction welding, wherein two pipe diameters of 60mm and 89mm do not need to be drawn and cleaned and annealed, five pipe diameters of 45mm, 49mm, 51mm, 55mm and 57mm60mm can be drawn and reduced by 60mm, three pipe diameters of 65mm, 70mm and 80mm can be drawn and reduced by 89mm, the appearance surface of the seamless titanium welded pipe produced by at least one pass of cold drawing and reducing and annealing is invisible with original welding lines, the wall thickness and the outer diameter are uniform, the original welding lines and the heat affected zone are consistent with the base metal in length direction and circumferential direction, the production method comprises the steps of forming and welding with a belt material, inner and outer scarfing and finishing, sizing and sawing, cold drawing the welded pipe with the non-on-line welding specification, and finally cleaning and annealing.
2. The seamless titanium welded pipe produced by the invention has high dimensional precision and good mechanical property, the production efficiency is improved by more than 10 times compared with seamless pipe making and argon arc welding pipes, the process route that the seamless titanium heat-preservation cup pipe is directly and rapidly prepared by the raw material coil is realized, and the production cost is greatly reduced.
Drawings
FIG. 1 is a schematic view of a welded pipe flow of a seamless titanium thermos cup according to the present invention;
FIG. 2 is a schematic view of the diameter-reducing cold-drawing process of the welded pipe of the seamless titanium thermos cup of the present invention.
In the figure: 1. a forming roller; 2. inducing current at high frequency; 3. a squeeze roll; 4. a scar scraping knife; 5. a finishing roller; 6. sawing and cutting machine; 7. welding a titanium tube by high-frequency induction; 8. welding seams; 9. a heat affected zone; 10. cold drawing a reducing die; 11. cold-drawing the reducing pipe; 12. an ultrasonic cleaning machine; 13. a vacuum induction furnace; 14. seamless titanium welded pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1-1:
as shown in fig. 1 and 2;
a seamless titanium vacuum cup welded pipe is made by forming, welding, scarfing, finishing, sawing a stripped titanium belt coil, cold-drawing, reducing diameter, cleaning and annealing the welded pipe in at least one pass, wherein the welded pipe is a high-frequency induction straight seam welded titanium pipe, the appearance surface of the prepared seamless titanium welded pipe is invisible with an original welding line, the wall thickness and the outer diameter are uniform, the structure and the performance of the original welding line and a heat affected zone are consistent with those of a parent metal in the length direction and the circumferential direction, and the seamless titanium vacuum cup welded pipe is a polygonal equiaxial structure with uniform size.
The outer diameter of the seamless titanium welded pipe is 60mm, the wall thickness is 0.5mm, and the length is 2000 mm;
the main pipe is a TA2 grade high-frequency induction straight welding titanium pipe with the outer diameter of 60mm, the wall thickness of 0.5mm and the length of 2000 mm.
A production method of a seamless titanium thermos cup welded pipe comprises the steps of a, forming and welding; b, scarping and finishing; step c, sawing or cold-drawing; d, cleaning and annealing:
step a, forming and welding: the forming roller 1 extrudes and forms a titanium strip coil, the high-frequency induction current 2 rapidly heats the edge of the strip material, and the extrusion roller 3 extrudes and welds the edge;
b, scaring and finishing: b, continuously scraping the extruded welding slag at the welding seam 8 in the forming and welding in the step a by the inner and outer scarping knives 4, and extruding and correcting the roundness and straightness of the welded pipe by the finishing roller 5 so as to obtain a high-frequency induction welded titanium pipe 7;
step c, sawing or cold drawing: the high-speed sawing machine 6 cuts the high-frequency induction welding titanium pipe 7 formed in the scarfing and finishing in the step b along with the fixed length, so that the manufacturing cost of the die, the welding die change and the debugging time are saved;
d, cleaning and annealing: the high-frequency induction welding titanium pipe 7 is subjected to ultrasonic cleaning, detection and drying through an ultrasonic cleaning machine 12, and is sent into a channel type vacuum induction furnace 13 for annealing, so that the tissues and the performances of the original welding seam 8 area and the heat affected zone 9 of the prepared seamless titanium welded pipe 14 are more consistent with those of a parent metal, and the seamless titanium welded pipe 14 is obtained after annealing treatment.
In the step c, sawing or cold drawing, reducing cold drawing is omitted in the embodiment;
and d, during cleaning and annealing in the step d, controlling the temperature to be 600 ℃ and keeping the temperature for 5 min.
The seamless titanium thermos cup welded pipe 14 prepared by the steps only needs 0.005mm deep polishing, the original welding line 8 on the appearance surface can not be seen, the wall thickness and the outer diameter are uniform, the original welding line 8 and the heat affected zone 9 are consistent with the parent metal in the length direction and the circumferential direction, the structure and the performance are uniform with the parent metal, the seamless titanium thermos cup welded pipe is a polygonal equiaxial structure with uniform size, the size precision is high, the mechanical property is good, the production efficiency is improved by more than 10 times compared with that of a seamless pipe and an argon arc welded pipe, the process route that the seamless titanium thermos cup pipe is directly and rapidly prepared by a raw material coil is realized, and the production cost is greatly reduced.
Examples 1 to 2:
as shown in fig. 1 and 2;
a seamless titanium vacuum cup welded pipe is made by forming, welding, scarfing, finishing, sawing a stripped titanium belt coil, cold-drawing, reducing diameter, cleaning and annealing the welded pipe in at least one pass, wherein the welded pipe is a high-frequency induction straight seam welded titanium pipe, the appearance surface of the prepared seamless titanium welded pipe is invisible with an original welding line, the wall thickness and the outer diameter are uniform, the structure and the performance of the original welding line and a heat affected zone are consistent with those of a parent metal in the length direction and the circumferential direction, and the seamless titanium vacuum cup welded pipe is a polygonal equiaxial structure with uniform size.
The seamless titanium welded pipe 14 has an outer diameter of 57mm, a wall thickness of 0.5mm and a length of 2000mm, and is a diameter-reduced seamless titanium welded pipe;
the high-frequency induction welding titanium pipe 7 is a TA2 grade high-frequency induction straight welding titanium pipe with the outer diameter of 60mm, the wall thickness of 0.5mm and the length of 2000 mm.
In the step c, sawing or cold drawing, the cold drawing speed is 15-30m/min, the used reducing outer die is made of hard alloy, and the used cold drawing medium has sufficient viscosity and lubricity and can form a protective oil film on the surface of the titanium pipe;
in the step c, in the sawing or cold drawing, the maximum diameter reduction rate of each pass of cold drawing is not more than 36.5%;
in the step c, in the sawing or cold drawing, annealing is not needed in the 1 st pass, then when the diameter variation of each pass is more than 30%, one time of intermediate annealing is added between the cold drawing of each pass, and when the diameter variation of each pass is less than 30%, one more pass is added before annealing;
in this embodiment, a one-step diameter-reducing cold drawing is performed, and a diameter-reducing outer mold with an outer diameter of 57mm is used to obtain a seamless titanium welded pipe 14 with an outer diameter of 57mm, a wall thickness of 0.5mm and a length of 2000 mm.
The remaining steps of this example are the same as in example 1-1
Example 2-1:
as shown in fig. 1 and 2;
a seamless titanium vacuum cup welded pipe is made by forming, welding, scarfing, finishing, sawing a stripped titanium belt coil, cold-drawing, reducing diameter, cleaning and annealing the welded pipe in at least one pass, wherein the welded pipe is a high-frequency induction straight seam welded titanium pipe, the appearance surface of the prepared seamless titanium welded pipe is invisible with an original welding line, the wall thickness and the outer diameter are uniform, the structure and the performance of the original welding line and a heat affected zone are consistent with those of a parent metal in the length direction and the circumferential direction, and the seamless titanium vacuum cup welded pipe is a polygonal equiaxial structure with uniform size.
The seamless titanium welded pipe 14 has an outer diameter of 70mm, a wall thickness of 0.5mm and a length of 2000mm, and is a diameter-reduced seamless titanium welded pipe.
The high-frequency induction welding titanium pipe 7 is a TA1 high-frequency induction straight welding titanium pipe with the outer diameter of 89mm, the wall thickness of 0.5mm and the length of 2000 mm.
In the embodiment, the diameter-reducing cold drawing is carried out once, a diameter-reducing external mold with the outer diameter of 70mm is adopted, and the seamless titanium welded pipe 14 with the outer diameter of 70mm, the wall thickness of 0.5mm and the length of 2000mm is obtained after diameter-reducing cold drawing;
and d, during cleaning and annealing in the step d, controlling the temperature to be 600 ℃ and keeping the temperature for 6 min.
The rest of the procedure of this example is the same as example 1-1.
Example 2-2:
as shown in fig. 1 and 2;
the other steps of this example are unchanged, and the seamless titanium welded pipe 14 has an outer diameter of 65mm, a wall thickness of 0.5mm, a length of 2000mm, and is a reduced diameter seamless titanium welded pipe.
As the high-frequency induction welded titanium pipe 7, the unannealed TA1 high-frequency induction straight-seam welded titanium pipe having an outer diameter of 70mm, a wall thickness of 0.5mm and a length of 2000mm obtained in example 2-1 was used.
In the embodiment, the diameter-reducing cold drawing is performed once, a diameter-reducing external mold with the outer diameter of 70mm is adopted, and the seamless titanium welded pipe 14 with the outer diameter of 65mm, the wall thickness of 0.5mm and the length of 2000mm is obtained after diameter-reducing cold drawing;
the rest of the procedure of this example is the same as example 1-1.
Comparative example:
the titanium vacuum cup with the capacity of 450ml is manufactured by entrusting the seamless titanium welding pipe with the diameter of 60mm obtained in the embodiment 1-1, the seamless titanium welding pipe with the diameter of 57mm obtained in the embodiment 1-2, the seamless titanium welding pipe with the diameter of 70mm obtained in the embodiment 2-1 and the seamless titanium welding pipe with the diameter of 65mm obtained in the embodiment 2-2 to a vacuum cup factory to manufacture a titanium vacuum cup, wherein the titanium vacuum cup with the capacity of 350ml is manufactured by taking 60mm as a shell and taking 57mm as an inner container, the titanium vacuum cup with the capacity of 70mm as a shell and taking 65mm as an inner container, and the titanium vacuum cup with the capacity of 450ml is respectively compared with the following titanium vacuum cups with the same material, the same specification, the same capacity and the same sealing performance:
comparative example 1-1: the shell is 60mm multiplied by 0.5mm, the inner container is 57mm multiplied by 0.5mm, and TA2 seamless titanium tubes are used;
comparative examples 1 to 2: the shell is 60mm multiplied by 0.5mm, a TA2 seamless titanium tube is used, the inner container is 57mm multiplied by 0.5mm, and a TA2 argon arc welding titanium tube is used;
comparative examples 1 to 3: the shell is 60mm multiplied by 0.5mm, the inner container is 57mm multiplied by 0.5mm, and TA2 argon arc welding titanium welding pipes are used;
comparative example 2-1: the shell is 70mm multiplied by 0.5mm, the inner container is 65mm multiplied by 0.5mm, and TA1 seamless titanium tubes are used;
comparative examples 2 to 2: the shell is 70mm multiplied by 0.5mm, a TA1 seamless titanium welding tube is used, the liner is 65mm multiplied by 0.5mm, and a TA1 argon arc welding titanium tube is used;
comparative examples 2 to 3: the titanium tubes are welded by TA1 argon arc welding with the shell of 70mm multiplied by 0.5mm and the inner container of 65mm multiplied by 0.5 mm;
the comparative results are shown in Table 1.
TABLE 1
In the table, the heat preservation condition is that the temperature is 95 ℃ and the boiling water is filled, the environment temperature is 20 ℃, and the heat preservation time is 8 hours; the cold insulation condition is that ice water with the temperature of 0 ℃ is fully filled, the environment temperature is 20 ℃, and the cold insulation time is 8 hours.
The above table shows that the high-frequency induction seamless titanium vacuum cup welded pipe prepared by the invention has good performance, the flaring rate and the vacuum degree after vacuum pumping are not equal to or higher than those of the seamless titanium pipe, the heat and cold insulation performance of the prepared titanium vacuum cup is the same as that of the seamless titanium pipe, but the flaring rate of the argon arc welded pipe is low, the heat affected zone is easy to dent during vacuum pumping, and the vacuum degree and the heat and cold insulation effects are obviously lower than those of the high-frequency induction seamless titanium welded pipe and the seamless titanium pipe;
the high-frequency induction seamless titanium welded pipe prepared by cold drawing without diameter reduction in the embodiment 1-1 is equivalent to the high-frequency induction seamless titanium welded pipe and the high-frequency induction seamless titanium welded pipe prepared by cold drawing with diameter reduction in the embodiment 1-2 in the flaring rate, and the flaring rate is increased by more than 60% compared with that of an argon arc welded pipe;
the flaring rates of the high-frequency induction seamless titanium welded pipe and the seamless titanium pipe manufactured by one-time diameter-reducing cold drawing of the embodiment 2-1 and two-time diameter-reducing cold drawing of the embodiment 2-2 are basically not different and are increased by over 58 percent compared with the flaring rate of the argon arc welded pipe;
examples 1-1 and 1-2 and comparative examples 1-1, 1-2 and 1-3 are all TA2 pure titanium, examples 2-1 and 2-2 and comparative examples 2-1, 2-2 and 2-3 are all TA1 pure titanium, and TA1 pure titanium has higher purity than TA2 pure titanium, and ductility is increased, so flaring rate is relatively increased;
the heat and cold insulation effect of the vacuum cup is influenced by the capacity, so that the heat and cold insulation effect of the vacuum cup with the capacity of 450ml in the upper table is better than that of the vacuum cup with the capacity of 350 ml.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A production method of a seamless titanium thermos cup welded pipe is characterized by comprising the following steps: comprising the steps of a) forming and welding; step b) scaring and finishing; step c) sawing or cold drawing; step d) cleaning and annealing:
step a) forming and welding: the forming roller (1) extrudes and forms a titanium strip coil, the high-frequency induction current (2) rapidly heats the edge of the strip, and the extrusion roller (3) extrudes and welds the edge;
step b) scaring and finishing: the inner scarping knife and the outer scarping knife (4) continuously scrAN _ SNs the extruded welding slag at the welding seam (8), and the finishing roller (5) extrudes and corrects the roundness and straightness of the welded pipe, so that the high-frequency induction welded titanium pipe (7) is obtained;
step c) sawing or cold drawing: the high-speed sawing machine (6) cuts off the high-frequency induction welding titanium pipe (7) along with the fixed length, in order to save the manufacturing cost of a die, welding and die changing and debugging time, after the high-frequency induction welding titanium pipe (7) is subjected to end inserting and head shrinking, the large-diameter high-frequency induction welding titanium pipe (7) is manufactured into a cold-drawing reducing pipe (11) with a smaller diameter through a cold-drawing reducing die (10);
step d) cleaning and annealing: the cold-drawing reducing pipe (11) is subjected to ultrasonic cleaning, detection and drying through an ultrasonic cleaning machine (12), and is sent into a channel type vacuum induction furnace (13) for annealing, so that the structure and the performance of the original welding line (8) area and the heat affected zone (9) of the prepared seamless titanium welded pipe (14) are more consistent with those of a parent metal, and the seamless titanium welded pipe (14) is obtained after annealing treatment.
2. The method for producing the seamless titanium thermos cup welded pipe according to claim 1, characterized in that: step a) forming and welding, wherein the titanium strip coil is a pure titanium coil TA1 or TA2, hole patterns of a forming roller (1) and a squeezing roller (3) are planned according to material properties, hardness, pipe diameter, wall thickness, cold deformation stress and the like, superhard materials with poor affinity with titanium elements are selected to be made, the frequency and power of high-frequency induction current (2), the welding squeezing amount and the welding speed of the squeezing roller (3) and the like are adjusted according to the properties of the titanium elements, the thickness of the titanium strip, the forming pipe diameter and the like, the lowest welding speed is not lower than 60 m/min, and a formed welding seam (8) and a formed heat affected zone (9) are made to be as narrow as possible.
3. The method for producing the seamless titanium thermos cup welded pipe according to claim 1, characterized in that: and b) scraping and finishing, wherein the welding slag is a thin line-shaped projection formed by extruding the inner and outer superficial layer molten matters out of the welding seam (8) when the extrusion roller (3) applies upsetting force to the heated edge for welding, and the welding seam (8) is the solid-phase metal close to or equal to the base metal after the welding slag is removed.
4. The method for producing the seamless titanium thermos cup welded pipe according to claim 1, characterized in that: step c) sawing or cold drawing, wherein the cold drawing is diameter reduction cold drawing which does not reduce the wall and only uses a cold drawing diameter reduction outer die, the common pipe diameter of the titanium vacuum cup is 45mm, 49mm, 51mm, 55mm, 57mm, 60mm, 65mm, 70mm, 80mm and 89mm, the wall thickness is 0.5mm, forming, welding and finishing dies are developed for each pipe diameter, the investment is too large, the replacement and debugging time of the dies of each specification is long, only dies of two specifications of 60mm and 89mm are developed, wherein the two pipe diameters of 60mm and 89mm do not need cold drawing, the welded pipe with the diameter difference of less than or equal to 30mm can be cold drawn by a mother pipe with the pipe diameter of 60mm, 65mm, 70mm and 80mm, the welded pipe with the diameter difference of less than or equal to 30mm can be cold drawn by at least two cold drawing times, and a special cold-drawing medium which is modulated according to the characteristics of low density, high specific strength, poor ductility, low thermal conductivity and the like of the titanium element is adopted during cold drawing, the maximum deformation of each pass is not more than 36.5 percent, and the speed is 15-30 m/min.
5. The method for producing the seamless titanium thermos cup welded pipe according to claim 1, characterized in that: and c) sawing or cold-drawing, wherein annealing is not needed in the first cold-drawing pass, then, when the deformation of each pass is more than 30%, one-pass intermediate annealing is added before cold-drawing again, and when the deformation of each pass is less than 20%, one-pass cold-drawing is added before annealing.
6. The method for producing the seamless titanium thermos cup welded pipe according to claim 1, characterized in that: and d) cleaning and annealing, wherein the intermediate annealing is annealing under the atmosphere of inert gas, the temperature is 600-650 ℃, and the heat preservation time is 5-10 min.
7. The method for producing the seamless titanium thermos cup welded pipe according to claim 1, characterized in that: and d) cleaning and annealing, wherein the ultrasonic cleaning is realized by diluting a commercial heavy oil stain cleaning agent by 10 times, the diameter-reduced titanium welded pipe is immersed into a cleaning pool, an ultrasonic probe is started to clean for 20-30 minutes when the temperature is heated to 45-50 ℃, the welded pipe qualified in water pressure detection is dried, and the temperature is 600-650 ℃ and the heat preservation time is 5-10 minutes when the vacuum annealing is carried out.
8. A seamless titanium thermos cup welded pipe manufactured by the manufacturing method according to any one of claims 1 to 7.
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