CN101780492B - Method for processing titanium and titanium alloy multi-start helical tubes - Google Patents
Method for processing titanium and titanium alloy multi-start helical tubes Download PDFInfo
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- CN101780492B CN101780492B CN2010101392149A CN201010139214A CN101780492B CN 101780492 B CN101780492 B CN 101780492B CN 2010101392149 A CN2010101392149 A CN 2010101392149A CN 201010139214 A CN201010139214 A CN 201010139214A CN 101780492 B CN101780492 B CN 101780492B
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- 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
- Y02P10/00—Technologies related to metal processing
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Abstract
The invention discloses a method for processing titanium and titanium alloy multi-start helical tubes, which comprises the following steps: 1) carrying out cold machining on titanium and titanium alloy materials to produce light tubes, namely carrying out vacuum heat treatment on the titanium and titanium alloy materials for 0.5 to 2 hours at the temperature of between 720 and 800 DEG C, then cooling the titanium and titanium alloy materials to room temperature, and carrying out finish rolling on the titanium and titanium alloy materials at the temperature of between 300 and 400 DEG C to obtain the light tubes; 2) processing the titanium and titanium alloy light tubes into multi-start helical tubes, namely carrying out vacuum heat treatment and internal annealing on the rolled light tubes for 0.5 to 1 hour for relieving stress at the temperature of between 300 and 400 DEG C, then extruding the light tubes to produce titanium and titanium alloy multi-start helical tubes by using a multi-start cold extrusion press. By adopting a vacuum heat treatment process, the method reduces the hardness of the titanium and titanium alloy materials, improves the toughness thereof, changes the organizational structure thereof and refines the grain size to improve the processability of the titanium and titanium alloy materials; meanwhile, the produced coiled tube has the advantages of large heat transfer area, high heat transmission effectiveness, difficult residue sediment, high decay resistance and the like.
Description
Technical field
The present invention relates to a kind of processing method of metal tube, specifically, relate to a kind of titanium or titanium alloy multi-start helical tubes processing method.
Background technology
Reform and open up to the outside world over more than 30 year; China's titanium or titanium alloy plate, pipe, rod, silk and forging (encircle, biscuit) market grows out of nothing, from small to large, obviously upgrade to structure from the total amount Rapid Expansion, progressively formed variation with Chinese characteristics, multi-level consumption market.
Titanium or titanium alloy plate, pipe, rod, silk and forging (ring, biscuit) market scale has enlarged several times and even tens times than the initial stage of reform, its development achievements attract people's attention.
Usually titanium has good corrosion resistance in oxidisability and neutral medium, and the corrosion resisting property in seawater, wet chlorine and chloride solution is more excellent.Specific strength (tensile strength/density) height, tensile strength can reach 100～140kgf/mm
2, and density is merely 60% of steel.Medium temperature intensity is good, and serviceability temperature is than the high several Baidu of aluminium alloy, and cryogenic property is good, and the titanium alloy that interstitial element is extremely low like TA7, can also keep certain plasticity down at-253 ℃.Elastic modelling quantity is low, and thermal conductivity is little, no ferromagnetism.Under moderate temperature, still can keep desired intensity, can long-term work under 450～500 ℃ temperature.Corrosion resistance is good, and the titanium surface forms the oxide-film of one deck even compact immediately in atmosphere, and the ability of the multiple erosion medium resistance of opposing is arranged.
Thereby, the titanium or titanium alloy pipe because have light weight, advantage such as intensity is high, highly sensitive and corrosion resistance is strong, application is more and more widely.
The use of titanium or titanium alloy pipe on heat-exchange system not only can remedy the deficiency of other metal tube corrosion-resistant, can also improve the heat exchange efficiency of heat-exchange system indirectly.As previously mentioned, good anti-corrosion property can make the titanium or titanium alloy heat exchanger tube make the light-wall pipe that wall thickness is 0.3-0.6mm, like this, can improve the weight and volume that exchange capability of heat can reduce heat exchanger again.High resistance to corrosion has also prolonged the service life of heat exchanger greatly, has reduced maintenance cost.With the exception of this, titanium ion is difficult for running off, so can make full use of this non magnetic characteristics; Be used as the heat exchanger in pharmacy and the food service industry; It is dropwise condensation that the smooth surface of titanium makes the heat exchange mode of itself and steam, has reduced thermal resistance, and; Show that non-scaling also can reduce thermal resistance, the heat exchange property of titanium or titanium alloy pipe is significantly improved.
Yet, no matter be that copper, aluminium or stainless steel light pipe or titanium or titanium alloy light pipe all exist defectives such as heat transfer area is little, heat exchange efficiency is low, the easy deposition of residue.
Thereby in order to overcome the defective of light pipe, helix tube has obtained application more and more widely.Helix tube be exactly heat exchanger tube through rolling or with other processing method within it outer surface form a kind of efficient heat-exchanging pipe of spiral lamination.
Fluid receives the obstruction and the guiding of inside spin line when in pipe, flowing, the interrupted part with guiding of fluid has only suitable spiral lamination rotation; Another part fluid is by spiral lamination outer axial flow.The convexity of inside spin line makes the fluid along the fluid impact spiral lamination outer axial flow of spiral lamination rotation.Before a kind of effect help the attenuate fluid boundary layer; A kind of effect in back makes the fluid generation heat exchange of spiral lamination outer axial flow, and the area of heat exchange and flow process be greater than the heat exchange area and the flow process of original heat exchanger tube in addition, thereby can accelerate the heat transmission of wall to bodies of fluid.The result of two kinds of effect comprehensive functions is strengthened the intraductal heat exchange effect.
The outer invigoration effect to medium of pipe is embodied in external screw thread has on the one hand increased heat exchange area; Be on the other hand since the shell side MEDIA FLOW through male-pipe when surface, external screw thread produces perturbation action to the laminar flow boundary layer, attenuate the thickness in boundary layer.And the turbulent flow that the surface forms is also strong than light pipe, further the attenuate boundary layer thickness.The result of comprehensive function makes this cast have higher exchange capability of heat.When this cast is used to evaporate, can increase the quantity that bubble forms on the per surface, improve the boiling heat transfer ability; When being used for condensation, external screw thread extremely helps managing the drippage of lower end condensate liquid, makes the liquid film attenuate, and thermal resistance further reduces, and improves condensation heat transfer efficient.
Screwed tube heat exchanger; Be a kind of high-performance heat exchanger of augmentation of heat transfer, its structure and movable tube sheets heat exchanger, fixed tube-sheet exchanger and U type pipe heat exchanger are basic identical, and the pipe in the tube bank that different is is substituted by the screwed pipe with the extended surface augmentation of heat transfer; Can with tear stream bar, external flow guiding cylinder, the combination of new construction high-performance heat exchanger open; Be that present intensify heat transfer pipe consumption is maximum, promote better the enhanced heat transfer component that use occasion is many.The screwed tube heat exchanger advantage is: 1, overall heat-transfer coefficient can improve more than 30%; 2, has good corrosion resistance; 3, has good anti-tartar performance; 4, the enforcing condensation effect is remarkable; 6, being specially adapted to the heavy oil system conducts heat; 7, be suitable for various no phase-change heat transfers.
But the titanium or titanium alloy pipe is processed into helix tube because of existing the difficulty that processing technology requires aspects such as height, processing cost height, also is not seen in report.
Summary of the invention
The technical issues that need to address of the present invention just are to overcome the defective of prior art; A kind of titanium or titanium alloy multi-start helical tubes processing method is provided; Its processing technology is unique, and the titanium or titanium alloy multi-start helical tubes of manufacturing is applied in the heat exchanger coils, compares with the heat exchanger coils of light pipe dish system; Because the turbulence effect of circulation in its unique surface texture and the pipe, have that heat transfer area is big, heat exchange efficiency is high, residue is difficult for advantages such as deposition and corrosion resistance and good.Improve the service life of heat exchange coil, widened the range of application of heat exchange coil, can be widely used in fields such as household electrical appliances, chemical industry, oil or ocean.
For addressing the above problem, the present invention adopts following technical scheme:
A kind of titanium or titanium alloy multi-start helical tubes of the present invention processing method, said processing method comprises the following steps:
1), the titanium or titanium alloy material is cold worked into light pipe: the titanium or titanium alloy material under 720-800 ℃ temperature, through 0.5-2 hour vacuum heat, is cooled to room temperature, and finish rolling obtains light pipe under 150-600 ℃ temperature;
2), the titanium or titanium alloy light pipe is processed into multi-start helical tubes: the light pipe after rolling at stress relieving by annealing under 300～400 ℃ the temperature, in 0.5-1 hour vacuum heat, is squeezed into the titanium or titanium alloy multi-start helical tubes then on the bull cold extrusion press.
Spiral on the said multi-start helical tubes is a 3-12 spiral.
The present invention can further be heated to 100-200 ℃ with the titanium or titanium alloy multi-start helical tubes and coil into titanium or titanium alloy multiple thread heat exchange coil on coiler, the speed of coiling out is 10m/min～15m/min.
The present invention adopts vacuum heat treatment process; Reduce the hardness of titanium or titanium alloy material, improve its toughness, change its institutional framework; The crystal grain thinning degree is to improve the titanium or titanium alloy drawing abillity; Make percentage elongation at 150-200%, can carry out 20-30% deflection or the more cold working of aximal deformation value, can reach more than 90% by the lumber recovery of hollow bloom to tubing.
Only need lower treatment temperature in the inventive method, energy consumption is low.And with the titanium or titanium alloy multi-start helical tubes dependable performance that makes under the finish-rolling process condition, the precision of product is high.Its tension proof strength is bigger, and its elastic deformability is more than 30%.
Titanium or titanium alloy multi-head spiral heat exchange coil by the inventive method manufacturing is compared with the heat exchanger coils of titanium light pipe dish system; Because the turbulence effect of circulation in its unique surface texture and the pipe, have that heat transfer area is big, heat exchange efficiency is high, residue is difficult for advantages such as deposition and corrosion resistance and good.Improve the service life of heat exchange coil, widened the range of application of heat exchange coil, can be widely used in fields such as household electrical appliances, chemical industry, oil or ocean.
The specific embodiment
One, the titanium or titanium alloy material is cold worked into light pipe:
1), be TB2 alloy cast ingot cogging forging, the hot rolling of 380mm with the diameter of vacuum secondary smelting, obtain TB2 and roll rod;
2), TB2 is rolled rod and be machined to
optical wand with bar; Be heated to 720 ℃～800 ℃; Vacuum heat also is incubated 30～120min, is cooled on extruder, to carry out cold extrusion after the room temperature and obtain the pipe that external diameter is 85～88mm;
3), pipe is carried out inside and outside polishing, pickling removal pipe surfaces externally and internally oxide skin;
4), carry out four road finish rolling:
A, cold rolling through a passage cogging on the LG60 cold pilger mill, the intermediate annealing temperature is 450～500 ℃;
B, cold rolling through second passage cogging on the LG50 cold pilger mill, the intermediate annealing temperature is 350～400 ℃;
C, cold rolling through the 3rd passage cogging on the LG30 cold pilger mill, the intermediate annealing temperature is 350～600 ℃;
D, cold rolling through the 4th passage cogging on the LD15 cold pilger mill, the intermediate annealing temperature is 150～300 ℃;
Two, the titanium or titanium alloy light pipe is processed into multi-start helical tubes:
Light pipe after rolling at stress relieving by annealing under 300～400 ℃ the temperature, in 0.5-1 hour vacuum heat, is squeezed into the titanium or titanium alloy multi-start helical tubes then on the bull cold extrusion press.
Three, the titanium or titanium alloy multi-start helical tubes is processed coil pipe:
The titanium or titanium alloy multi-start helical tubes is heated to 100-200 ℃ coils into titanium or titanium alloy multiple thread heat exchange coil on coiler, the speed of coiling out is 10m/min～15m/min.
The present invention has created the process conditions that new being suitable for manufactures the titanium or titanium alloy multi-start helical tubes in the technical technological transformation of carrying out of original light pipe, and the heat exchanger coils of titanium or titanium alloy multi-head spiral pipe manufacturer can increase the heat exchange area of 30%-70%.Make heat exchange effect the high 1.5-3 of heat exchange effect times, reduce the volume of heat exchanger 1/3-2/3 than light pipe.Guaranteed that resource utilization is higher.
What should explain at last is: obviously, the foregoing description only be for clearly the present invention is described and is done for example, and be not qualification to embodiment.For the those of ordinary skill in affiliated field, on the basis of above-mentioned explanation, can also make other multi-form variation or change.Here need not also can't give exhaustive to all embodiments.And conspicuous variation of being extended out thus or change still are among protection scope of the present invention.
Claims (1)
1. titanium or titanium alloy multi-start helical tubes processing method, it is characterized in that: said processing method comprises the following steps:
One, the titanium or titanium alloy material is cold worked into light pipe:
1), be TB2 alloy cast ingot cogging forging, the hot rolling of 380mm with the diameter of vacuum secondary smelting, obtain TB2 and roll rod;
2), TB2 is rolled rod and be machined to
78～80mm optical wand with bar; Be heated to 720 ℃～800 ℃; Vacuum heat also is incubated 30～120min, is cooled on extruder, to carry out cold extrusion after the room temperature and obtain the pipe that external diameter is 85～88mm;
3), pipe is carried out inside and outside polishing, pickling removal pipe surfaces externally and internally oxide skin;
4), carry out four road finish rolling:
A, cold rolling through a passage cogging on the LG60 cold pilger mill, the intermediate annealing temperature is 450～500 ℃;
B, cold rolling through second passage cogging on the LG50 cold pilger mill, the intermediate annealing temperature is 350～400 ℃;
C, cold rolling through the 3rd passage cogging on the LG30 cold pilger mill, the intermediate annealing temperature is 350～600 ℃;
D, cold rolling through the 4th passage cogging on the LD15 cold pilger mill, the intermediate annealing temperature is 150～300 ℃;
Two, the titanium or titanium alloy light pipe is processed into multi-start helical tubes:
Light pipe after rolling at stress relieving by annealing under 300～400 ℃ the temperature, in 0.5-1 hour vacuum heat, is squeezed into the titanium or titanium alloy multi-start helical tubes then on the bull cold extrusion press;
Three, the titanium or titanium alloy multi-start helical tubes is processed coil pipe:
The titanium or titanium alloy multi-start helical tubes is heated to 100-200 ℃ coils into titanium or titanium alloy multiple thread heat exchange coil on coiler, the speed of coiling out is 10m/min～15m/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101392149A CN101780492B (en) | 2010-04-06 | 2010-04-06 | Method for processing titanium and titanium alloy multi-start helical tubes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101392149A CN101780492B (en) | 2010-04-06 | 2010-04-06 | Method for processing titanium and titanium alloy multi-start helical tubes |
Publications (2)
| Publication Number | Publication Date |
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| CN101780492A CN101780492A (en) | 2010-07-21 |
| CN101780492B true CN101780492B (en) | 2012-02-08 |
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| CN2010101392149A Expired - Fee Related CN101780492B (en) | 2010-04-06 | 2010-04-06 | Method for processing titanium and titanium alloy multi-start helical tubes |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106424256A (en) * | 2016-10-26 | 2017-02-22 | 中国电子科技集团公司第四十八研究所 | Machining device for spiral copper tube and machining method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61190052A (en) * | 1985-02-16 | 1986-08-23 | Sumitomo Metal Ind Ltd | Manufacture of finned tube made of titanium |
| JPS61273218A (en) * | 1985-05-29 | 1986-12-03 | Sumitomo Metal Ind Ltd | Manufacture of row fin pipe made of titanium |
| JPS63192852A (en) * | 1987-02-05 | 1988-08-10 | Sumitomo Metal Ind Ltd | Production of titanium heat transfer pipe |
| CN1323182C (en) * | 2004-07-07 | 2007-06-27 | 黄忠伟 | Formala and technology of high performance titanium alloy pipe |
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