CN107186037A - A kind of thermo shaping method of titanium alloy corrugated pipe - Google Patents
A kind of thermo shaping method of titanium alloy corrugated pipe Download PDFInfo
- Publication number
- CN107186037A CN107186037A CN201710438704.0A CN201710438704A CN107186037A CN 107186037 A CN107186037 A CN 107186037A CN 201710438704 A CN201710438704 A CN 201710438704A CN 107186037 A CN107186037 A CN 107186037A
- Authority
- CN
- China
- Prior art keywords
- titanium alloy
- corrugated pipe
- tubing
- shaping method
- alloy corrugated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 40
- 238000007493 shaping process Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000000919 ceramic Substances 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 8
- 239000006052 feed supplement Substances 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims abstract description 6
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 239000010936 titanium Substances 0.000 claims description 6
- 239000011261 inert gas Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims 1
- 238000010304 firing Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
-
- 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
- B21D15/00—Corrugating tubes
- B21D15/04—Corrugating tubes transversely, e.g. helically
- B21D15/10—Corrugating tubes transversely, e.g. helically by applying fluid pressure
-
- 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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
A kind of thermo shaping method of titanium alloy corrugated pipe disclosed by the invention, comprises the following steps：Between two pieces of supporting plates that titanium alloy pipe is arranged on to shaping；Ceramic die is arranged on to the centre of tubing；Powered electrode is installed in position between sealing ring and ceramic die, then electrode is applied in the electric current of certain ampere, the temperature-rise period of tubing, when temperature is added to 400 DEG C, applies certain interior pressure by ventilating so that initial ripple is formed at ripple；After initial ripple is formed, the air pressure of intensifying cylinder drift applies axial compressive force to tubing, while the die cavity feed supplement to titanium alloy pipe, obtains described titanium alloy corrugated pipe.The thermo shaping method of the titanium alloy corrugated pipe, can effectively overcome that traditional hot forming firing rate is slow, energy loss big, the problem of processing efficiency is low.And it is the bellows high temperature resistant of the material, high pressure resistant.It can be used under 400 DEG C, pressure 250KG operating mode.
Description
Technical field
The present invention relates to the technical field of bellows, more particularly to a kind of thermo shaping method of titanium alloy corrugated pipe.
Background technology
Titanium alloy corrugated pipe is typically used in that working environment is severe or the higher workplace of performance requirement.Titanium alloy belongs to
In difficult deformable metal, cold forming ability is poor, is generally processed using heat forming technology.Hydroforming and mechanical molding belong to
Cold forming process, is not suitable for manufacture titanium alloy corrugated pipe；For welding forming, although can be produced by precision welding technology
Titanium bellows, but welding bellows is not pressure-resistant, and manufacturing cost is high；And SPF Technology firing rate is slow, energy loss
Greatly, the low production efficiency of bellows.Existing forming technique can not realize quick, the high efficient production of titanium alloy corrugated pipe.
The content of the invention
It is an object of the invention to provide a kind of thermo shaping method of titanium alloy corrugated pipe, solve in above-mentioned prior art problem
One or more.
A kind of thermo shaping method for titanium alloy corrugated pipe that the present invention is provided, comprises the following steps：
A1, by titanium alloy pipe be arranged on shaping two pieces of supporting plates between, cover upper bush, control sleeve left and right ends
Overhang so that overhang is the feed supplement length required for shaping, the interface for applying internal bulging air pressure is linked on tubing；
A2, by ceramic die be arranged on tubing centre, install afterwards protection ceramic die metal splint, lead to
The screw mandrel crossed in top blind flange and shaping dies fixes the position of ceramic die, it is slid axially from random；
Powered electrode is installed in A3, the position between sealing ring and ceramic die, then applies certain ampere to electrode
Electric current, in the temperature-rise period of tubing, when temperature is added to 400 DEG C, passes through to ventilate and apply certain interior pressure so that at ripple
Form initial ripple；
A4, after initial ripple is formed, the air pressure of intensifying cylinder drift, to tubing apply axial compressive force, while to titanium
The die cavity feed supplement of alloy pipe, obtains described titanium alloy corrugated pipe.
In some embodiments, the wave height of titanium alloy corrugated pipe is 15mm, and the pitch of waves is 26mm.The titanium alloy ripple of the size
Line tubular elastic is good, and compensation displacement effect is good.
In some embodiments, the wave height of initial ripple is 2-4mm.Initially wave height is too small to cause mould relative
Cause sliding dynamic in tubing, crossing conference causes the defect that bulging bursts.
In some embodiments, barometric pressure load uses inert gas.Inert gas can prevent titanium alloy corrugated pipe by oxygen
Change.
In some embodiments, certain electric current is 3500-4000A.The electric current is passed through, the temperature stabilization of heating can be caused
At 700-800 DEG C.
In some embodiments, certain interior pressure is 0.2-0.4Mpa.The air pressure in swollen prima stage is excessive to be occurred
Defect is burst, therefore the suitable interior pressure of selection carries out bulging.
In some embodiments, the material of titanium alloy pipe includes by weight percentage：5.5%-6.8% Al,
3.5-4.5% V ,≤0.03% Fe ,≤0.10% C ,≤0.20% O ,≤0.05% N ,≤0.015% H, its
Remaining is Ti.The component obtains titanium alloy corrugated pipe high temperature resistant, high pressure resistant, can be used under 400 DEG C, pressure 250KG operating mode.
Embodiment
With reference to Figure of description, the present invention is described in more detail.
Fig. 1 is the device that titanium alloy corrugated pipe shapes, as shown in Figure 1：
It is vertical provided with two supporting plates 3, branch on a kind of thermal forming device of titanium alloy corrugated pipe, including pedestal 6, pedestal 6
Fagging 3 is provided with through hole, and tubing 4 is fixed on supporting plate 3 by the through hole, and the two ends of tubing 4 are arranged with pipe sleeve 8, and the two ends of pedestal 6 are set
There are two cylinders 1, the one end of cylinder 1 is provided with and drives drift 2, the center of tubing 4 is provided with ceramic die 5.Tubing 4 and pipe sleeve 8 it
Between be provided with sealing ring 7.Install powered electrode in position between sealing ring 7 and ceramic die 5.
Based on the thermo shaping method of titanium alloy corrugated pipe building mortion, comprise the following steps：
A1, by titanium alloy pipe be arranged on shaping two pieces of supporting plates between, cover upper bush, control sleeve left and right ends
Overhang so that overhang is the feed supplement length required for shaping, the interface for applying internal bulging air pressure is linked on tubing；
A2, by ceramic die be arranged on tubing centre, install afterwards protection ceramic die metal splint, lead to
The screw mandrel crossed in top blind flange and shaping dies fixes the position of ceramic die, it is slid axially from random；
Powered electrode is installed in A3, the position between sealing ring and ceramic die, then applies certain ampere to electrode
Electric current, in the temperature-rise period of tubing, when temperature is added to 400 DEG C, passes through to ventilate and apply certain interior pressure so that at ripple
Form initial ripple；
A4, after initial ripple is formed, the air pressure of intensifying cylinder drift, to tubing apply axial compressive force, while to titanium
The die cavity feed supplement of alloy pipe, obtains described titanium alloy corrugated pipe.
It is preferred that, the wave height of titanium alloy corrugated pipe is 15mm, and the pitch of waves is 26mm.
It is preferred that, the wave height of initial ripple is 2-4mm.
It is preferred that, barometric pressure load uses inert gas.
It is preferred that, certain electric current is 3500-4000A.
It is preferred that, certain interior pressure is 0.2-0.4Mpa.
The material of titanium alloy pipe includes by weight percentage：5.5%-6.8% Al, 3.5-4.5% V ,≤
0.03% Fe ,≤0.10% C ,≤0.20% O ,≤0.05% N ,≤0.015% H, remaining be Ti.The material
Bellows can be used under 400 DEG C, pressure 250KG operating mode.
The embodiment that the present invention is provided aids in hot forming using electric current, is produced during using highdensity electric current by metal
A large amount of Joule heats, are heated to rapidly forming temperature by metal pipe material, are then plastically deformed.The hot forming mode can be by
Metal pipe material is heated to forming temperature in tens seconds even shorter time, greatlys save the heat time, improves technique
Efficiency, and forming temperature can be made to maintain relatively steady state, it is to avoid oxidation, corrugation etc. are asked caused by forming temperature is unstable
Topic.
Presented above is only the preferred embodiment of the present invention, it is noted that to those skilled in the art, not
On the premise of departing from the invention design, various modifications and improvements can be made, these also should be regarded as the protection of the present invention
Within the scope of.
Claims (7)
1. a kind of thermo shaping method of titanium alloy corrugated pipe, it is characterised in that comprise the following steps：
A1, by titanium alloy pipe be arranged on shaping two pieces of supporting plates between, cover upper bush, the stretching of control sleeve left and right ends
Amount so that overhang is the feed supplement length required for shaping, the interface for applying internal bulging air pressure is linked on tubing；
A2, by ceramic die be arranged on tubing centre, install afterwards protection ceramic die metal splint, pass through top
Screw mandrel on portion's cover plate and shaping dies fixes the position of ceramic die, it is slid axially from random；
Powered electrode is installed in A3, the position between sealing ring and ceramic die, then applies the electricity of certain ampere to electrode
In stream, the temperature-rise period of tubing, when temperature is added to 400 DEG C, apply certain interior pressure by ventilating so that formed at ripple
Initial ripple；
A4, after initial ripple is formed, the air pressure of intensifying cylinder drift, to tubing apply axial compressive force, while to titanium alloy
The die cavity feed supplement of tubing, obtains described titanium alloy corrugated pipe.
2. a kind of thermo shaping method of titanium alloy corrugated pipe according to claim 1, it is characterised in that the titanium alloy ripple
The wave height of line pipe is 15mm, and the pitch of waves is 26mm.
3. a kind of thermo shaping method of titanium alloy corrugated pipe according to claim 1, it is characterised in that the initial ripple
Wave height be 2-4mm.
4. a kind of thermo shaping method of titanium alloy corrugated pipe according to claim 1, it is characterised in that the barometric pressure load
Use inert gas.
5. a kind of thermo shaping method of titanium alloy corrugated pipe according to claim 1, it is characterised in that certain electric current
For 3500-4000A.
6. a kind of thermo shaping method of titanium alloy corrugated pipe according to claim 1, it is characterised in that described certain interior
Pressure is 0.2-0.4Mpa.
7. a kind of thermo shaping method of titanium alloy corrugated pipe according to claim 1, it is characterised in that the titanium alloy tube
The material of material includes by weight percentage：5.5%-6.8% Al, 3.5-4.5% V ,≤0.03% Fe ,≤0.10%
C ,≤0.20% O ,≤0.05% N ,≤0.015% H, remaining be Ti.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710438704.0A CN107186037A (en) | 2017-06-12 | 2017-06-12 | A kind of thermo shaping method of titanium alloy corrugated pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710438704.0A CN107186037A (en) | 2017-06-12 | 2017-06-12 | A kind of thermo shaping method of titanium alloy corrugated pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107186037A true CN107186037A (en) | 2017-09-22 |
Family
ID=59876584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710438704.0A Pending CN107186037A (en) | 2017-06-12 | 2017-06-12 | A kind of thermo shaping method of titanium alloy corrugated pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107186037A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109465322A (en) * | 2018-11-09 | 2019-03-15 | 南京航空航天大学 | A kind of pulse current pulsating heating air pressure forming device and method for hard-to-deform alloy pipe fittings |
| CN113305190A (en) * | 2021-05-26 | 2021-08-27 | 哈尔滨工业大学 | Device and method for local beneficial wrinkles of prefabricated pipe |
| CN114406062A (en) * | 2021-12-22 | 2022-04-29 | 济南海圣机电科技有限公司 | Mould is used in bellows production |
| CN115815370A (en) * | 2022-10-25 | 2023-03-21 | 沈阳飞机工业（集团）有限公司 | Device and method for high temperature side pressure correction of titanium alloy |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1325784A1 (en) * | 2002-01-08 | 2003-07-09 | NHK Spring Co., Ltd. | Method of making a metallic bellows |
| CN101722225A (en) * | 2009-12-08 | 2010-06-09 | 王秀丽 | Novel hydraulic bulging process for tubular parts |
| CN102248058A (en) * | 2011-06-20 | 2011-11-23 | 哈尔滨工业大学（威海） | Process method for improving high pressure forming limit in tube |
| US20120047979A1 (en) * | 2010-08-25 | 2012-03-01 | Schuler Inc. | Hydroforming die assembly and method for deforming a tube |
| CN103182415A (en) * | 2011-12-28 | 2013-07-03 | 上海航天精密机械研究所 | Internal high pressure forming sealing device |
| CN103521588A (en) * | 2013-10-28 | 2014-01-22 | 哈尔滨工业大学 | Current-assisted titanium alloy bellows hot-forming tool and method |
| CN104607526A (en) * | 2015-02-14 | 2015-05-13 | 中国重型机械研究院股份公司 | Intra-pipe high pressure forming system |
| CN105344791A (en) * | 2015-11-23 | 2016-02-24 | 宁波思明汽车科技股份有限公司 | Plug structure for inner high pressure forming |
| CN205362343U (en) * | 2016-02-15 | 2016-07-06 | 天津市骏业不锈钢有限公司 | Compound pipe processingequipment of stainless steel |
| KR20160113368A (en) * | 2015-03-18 | 2016-09-29 | 주식회사 포스코 | Hydro forming apparatus |
| CN205869191U (en) * | 2016-05-25 | 2017-01-11 | 无锡卡豹动力科技有限公司 | Interior high -pressure forming hydraulic machine |
-
2017
- 2017-06-12 CN CN201710438704.0A patent/CN107186037A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1325784A1 (en) * | 2002-01-08 | 2003-07-09 | NHK Spring Co., Ltd. | Method of making a metallic bellows |
| CN101722225A (en) * | 2009-12-08 | 2010-06-09 | 王秀丽 | Novel hydraulic bulging process for tubular parts |
| US20120047979A1 (en) * | 2010-08-25 | 2012-03-01 | Schuler Inc. | Hydroforming die assembly and method for deforming a tube |
| CN102248058A (en) * | 2011-06-20 | 2011-11-23 | 哈尔滨工业大学（威海） | Process method for improving high pressure forming limit in tube |
| CN103182415A (en) * | 2011-12-28 | 2013-07-03 | 上海航天精密机械研究所 | Internal high pressure forming sealing device |
| CN103521588A (en) * | 2013-10-28 | 2014-01-22 | 哈尔滨工业大学 | Current-assisted titanium alloy bellows hot-forming tool and method |
| CN104607526A (en) * | 2015-02-14 | 2015-05-13 | 中国重型机械研究院股份公司 | Intra-pipe high pressure forming system |
| KR20160113368A (en) * | 2015-03-18 | 2016-09-29 | 주식회사 포스코 | Hydro forming apparatus |
| CN105344791A (en) * | 2015-11-23 | 2016-02-24 | 宁波思明汽车科技股份有限公司 | Plug structure for inner high pressure forming |
| CN205362343U (en) * | 2016-02-15 | 2016-07-06 | 天津市骏业不锈钢有限公司 | Compound pipe processingequipment of stainless steel |
| CN205869191U (en) * | 2016-05-25 | 2017-01-11 | 无锡卡豹动力科技有限公司 | Interior high -pressure forming hydraulic machine |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109465322A (en) * | 2018-11-09 | 2019-03-15 | 南京航空航天大学 | A kind of pulse current pulsating heating air pressure forming device and method for hard-to-deform alloy pipe fittings |
| CN113305190A (en) * | 2021-05-26 | 2021-08-27 | 哈尔滨工业大学 | Device and method for local beneficial wrinkles of prefabricated pipe |
| CN114406062A (en) * | 2021-12-22 | 2022-04-29 | 济南海圣机电科技有限公司 | Mould is used in bellows production |
| CN115815370A (en) * | 2022-10-25 | 2023-03-21 | 沈阳飞机工业（集团）有限公司 | Device and method for high temperature side pressure correction of titanium alloy |
| CN115815370B (en) * | 2022-10-25 | 2025-05-27 | 沈阳飞机工业（集团）有限公司 | Titanium alloy high temperature side pressure correction device and method |
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| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170922 |
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