CN112264490A - Pulse current assisted titanium alloy pipe numerical control bending forming die - Google Patents
Pulse current assisted titanium alloy pipe numerical control bending forming die Download PDFInfo
- Publication number
- CN112264490A CN112264490A CN202011032567.9A CN202011032567A CN112264490A CN 112264490 A CN112264490 A CN 112264490A CN 202011032567 A CN202011032567 A CN 202011032567A CN 112264490 A CN112264490 A CN 112264490A
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- Prior art keywords
- die
- bending
- titanium alloy
- pulse current
- alloy pipe
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- 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
- B21D9/00—Bending tubes using mandrels or the like
- B21D9/05—Bending tubes using mandrels or the like co-operating with forming members
- B21D9/07—Bending tubes using mandrels or the like co-operating with forming members with one or more swinging forming members engaging tube ends only
- B21D9/073—Bending tubes using mandrels or the like co-operating with forming members with one or more swinging forming members engaging tube ends only with one swinging forming member
-
- 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
- B21D9/00—Bending tubes using mandrels or the like
- B21D9/16—Auxiliary equipment, e.g. machines for filling tubes with sand
- B21D9/18—Auxiliary equipment, e.g. machines for filling tubes with sand for heating or cooling of bends
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The invention discloses a pulse current auxiliary titanium alloy pipe numerical control bending forming die which comprises a pulse current generator and a bending forming die, wherein the pulse current generator is used for applying pulse current to a titanium alloy pipe, the bending forming die comprises a pressing die, a crease-resistant die, a bending die, a fixed die, a clamping block and a core rod, the bending die is arranged at the lower end of the crease-resistant die, the pressing die and the crease-resistant die are matched with each other to fix one end of the titanium alloy pipe, and the fixed die and the clamping block are matched with each other to fix the other end of the titanium alloy pipe. The invention introduces pulse current during numerical control bending, and can obtain mechanical property and organization effect superior to those of the traditional process under the lower temperature environment by utilizing the electro-plasticity generated by electrifying.
Description
Technical Field
The invention relates to the technical field of bending dies, in particular to a pulse current auxiliary titanium alloy pipe numerical control bending forming die.
Background
The numerical control bending of the thin-wall titanium alloy pipe is always an industrial problem, because of the high strength, high hardness and high yield ratio of the titanium alloy, the outer side of the titanium alloy pipe is easy to crack, the inner side of the titanium alloy pipe is easy to destabilize and wrinkle, and the resilience after unloading is large in the common bending forming process suitable for stainless steel and aluminum alloy, so that great challenge is brought to reducing the resilience or predicting the compensation amount to ensure the bending forming precision, and the yield of the pipe fitting is low. However, the traditional method has great limitations, such as slow heating, difficult temperature control, large heat loss, great operation difficulty of workers and the like, so that the final forming efficiency is low and the yield is unstable.
Disclosure of Invention
The invention aims to solve the problems that: the pulse current is introduced during numerical control bending, and the mechanical property and the structure effect superior to those of the traditional process can be obtained in a lower temperature environment by utilizing the electro-plasticity generated by electrifying.
The technical scheme provided by the invention for solving the problems is as follows: the utility model provides a crooked forming die of titanium alloy pipe numerical control is assisted to pulsed current, includes pulsed current generator and bending mold, pulsed current generator is used for applying pulsed current for titanium alloy pipe, bending mold includes moulding-die, crease-resistant mould, bending die, fixed mould, clamp splice and plug, the bending die sets up the lower extreme of crease-resistant mould, the one end of fixed titanium alloy pipe is mutually supported with crease-resistant mould to the pressing die, the other end of fixed titanium alloy pipe is cooperated with clamp splice to the fixed mould.
Preferably, the crease-resist die is made of copper.
Preferably, the clamping block is provided with negative copper, one end of the bending forming die is connected with the crease-resistant die, and the other end of the bending forming die is connected with the negative copper.
Preferably, an insulating pad is arranged at the upper end of the negative electrode copper.
Preferably, an insulating pad is arranged between the crease-resist die and the bending die.
Preferably, the bending device further comprises a control device, wherein the control device is connected with the pulse current generator at the beginning of the numerical control bending process, and is disconnected with the pulse current generator at the end of the bending process.
Compared with the prior art, the invention has the advantages that: the invention introduces pulse current during numerical control bending, and utilizes the electric plasticity generated by electrification, on one hand, the electric pulse can instantly input high-density energy to the material, so that the heating rate is up to 106K/s order of magnitude, and the electric energy is directly converted into heat energy, so that the heat loss of indirect heat transfer is avoided. On the other hand, physical factors such as electron wind, electromigration and electromagnetic effect generated by the interaction between the high-density current pulse and the metal material atoms obviously influence the diffusion, phase change and recrystallization behaviors in the metal structure. The coupling effect of the pulse current heat and the non-heat effect causes the change of the material structure to be far away from the equilibrium state, which causes the change of the structure under the condition different from the traditional heat treatment, and obtains the structure improvement effect superior to the traditional process.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic diagram of the pulse current assisted numerically controlled bending operation of the present invention;
FIG. 2 is a diagram of the mold assembly of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings and examples, so that how to implement the technical means for solving the technical problems and achieving the technical effects of the present invention can be fully understood and implemented.
The embodiment of the invention is shown in fig. 1 and 2, and the pulse current assisted titanium alloy pipe numerical control bending forming die comprises a pulse current generator and a bending forming die, wherein the pulse current generator is used for applying pulse current to a titanium alloy pipe, the bending forming die comprises a pressing die, a crease-resist die, a bending die, a fixed die, a clamping block and a core rod, the bending die is arranged at the lower end of the crease-resist die, the pressing die and the crease-resist die are matched with each other to fix one end of the titanium alloy pipe, and the fixed die and the clamping block are matched to fix the other end of the titanium alloy pipe.
In this embodiment, the wrinkle-proof mold is made of copper.
In this embodiment, the clamp block is provided with negative copper, one end of the bending mold is connected with the anti-wrinkling mold, and the other end of the bending mold is connected with the negative copper.
In this embodiment, the upper end of the negative copper is provided with an insulating pad.
In this embodiment, an insulating pad is disposed between the wrinkle preventing die and the bending die.
In this embodiment, the bending apparatus further comprises a control device, wherein the control device is connected to the pulse current generator at the beginning of the numerical control bending process, and is disconnected at the end of the bending process. The automation degree can be greatly improved, and the production efficiency is improved.
The deformation area during numerical control bending is the bending part of the pipe in the figures 1 and 2, and due to the forming characteristics of the deformation area, defects mainly occur on the inner side and the outer side. The thinner the conduit, the weaker it withstands tensile and compressive stresses, resulting in buckling and wrinkling of the inner side, cracking of the outer side, and greater spring-back upon unloading. Therefore, the inner side and the outer side of the deformation of the steel plate are assisted by pulse current, so that the plasticity of the steel plate is increased, the cracking is reduced, and the rebound is reduced.
The pulse current is introduced accurately, preferably only the pulse current is applied to the inner side and the outer side of the bent part, and the pulse current is not connected to other parts of the pipe, so that the energy conservation and the working safety are ensured.
The bending process is as shown in fig. 1, and access points of the positive and negative electrodes of the circuit are selected according to the bending forming process flow and the working state of the die. The crease-resist mould (the material is generally copper, which has certain advantages) and the clamp mould are selected as access points of the anode and the cathode of the crease-resist mould, but the negative copper electrode of the clamp mould and the press mould are separated by an insulating pad so as to avoid current from flowing into the press mould at the beginning. An ultra-thin insulating pad is also required to be added between the wrinkle preventing die and the bending die to prevent current from flowing into the bending die without passing through the guide tube.
The foregoing is merely illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof is allowed to vary. All changes which come within the scope of the invention as defined by the independent claims are intended to be embraced therein.
Claims (6)
1. The utility model provides a titanium alloy pipe numerical control bending forming die is assisted to pulse current which characterized in that: including pulsed current generator and bending forming die, pulsed current generator is used for applying pulse current for titanium alloy pipe, bending forming die includes moulding-die, crease-resistant mould, bending die, fixed mould, clamp splice and plug, the heated mould of moulding-die and crease-resistant mould is connected, the bending die sets up the lower extreme of crease-resistant mould, the one end of fixed titanium alloy pipe is mutually supported with crease-resistant mould to the moulding-die, the other end of fixed titanium alloy pipe is cooperated with the clamp splice.
2. The numerical control bending forming die for the pulse current auxiliary titanium alloy pipe according to claim 1, characterized in that: the crease-resist die is made of copper (or other materials with good conductivity).
3. The numerical control bending forming die for the pulse current auxiliary titanium alloy pipe according to claim 2, characterized in that: the anti-crease bending die is characterized in that negative copper is arranged on the clamping block, one end of the bending die is connected with the anti-crease die, and the other end of the bending die is connected with the negative copper.
4. The numerical control bending forming die for the pulse current auxiliary titanium alloy pipe according to claim 3, characterized in that: and an insulating pad is arranged at the upper end of the negative copper.
5. The numerical control bending forming die for the pulse current auxiliary titanium alloy pipe according to claim 1, characterized in that: and an ultrathin insulating pad is arranged between the crease-resist die and the bending die.
6. The numerical control bending forming die for the pulse current auxiliary titanium alloy pipe according to claim 1, characterized in that: the bending device also comprises a control device, wherein the control device is connected to the pulse current generator when the numerical control bending process is started, and is disconnected when the bending process is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011032567.9A CN112264490A (en) | 2020-09-27 | 2020-09-27 | Pulse current assisted titanium alloy pipe numerical control bending forming die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011032567.9A CN112264490A (en) | 2020-09-27 | 2020-09-27 | Pulse current assisted titanium alloy pipe numerical control bending forming die |
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| Publication Number | Publication Date |
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| CN112264490A true CN112264490A (en) | 2021-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011032567.9A Pending CN112264490A (en) | 2020-09-27 | 2020-09-27 | Pulse current assisted titanium alloy pipe numerical control bending forming die |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114160625A (en) * | 2021-12-01 | 2022-03-11 | 吉林大学 | Pulse current assisted rapid bending forming method for magnesium alloy pipe |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62220223A (en) * | 1986-03-24 | 1987-09-28 | Mitsubishi Heavy Ind Ltd | Pipe bender by high frequency induction heating |
| CN101185949A (en) * | 2007-12-20 | 2008-05-28 | 上海交通大学 | Method for using numerically-controlled pipe bender to process heating constant temperature bending pipe |
| CN101422792A (en) * | 2007-11-02 | 2009-05-06 | 西北工业大学 | Adjustment method of thin-wall numerical-controlled bend-pipe forming die |
| CN102172691A (en) * | 2010-12-14 | 2011-09-07 | 绍兴文理学院 | Thin-wall stainless steel tube small-radium bending process and mold |
| CN103331345A (en) * | 2013-07-10 | 2013-10-02 | 西北工业大学 | Stretch-bending forming device with insulated stretching head and forming method thereof |
| CN109482690A (en) * | 2018-10-31 | 2019-03-19 | 南京航空航天大学 | A kind of electric current auxiliary rolling formation method of difficult-to-deformation material odd-shaped cross section pipe fitting |
| CN110014060A (en) * | 2019-04-16 | 2019-07-16 | 哈尔滨工业大学 | A kind of low-grade fever tube current auxiliary rotary draw bending device and method |
-
2020
- 2020-09-27 CN CN202011032567.9A patent/CN112264490A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62220223A (en) * | 1986-03-24 | 1987-09-28 | Mitsubishi Heavy Ind Ltd | Pipe bender by high frequency induction heating |
| CN101422792A (en) * | 2007-11-02 | 2009-05-06 | 西北工业大学 | Adjustment method of thin-wall numerical-controlled bend-pipe forming die |
| CN101185949A (en) * | 2007-12-20 | 2008-05-28 | 上海交通大学 | Method for using numerically-controlled pipe bender to process heating constant temperature bending pipe |
| CN102172691A (en) * | 2010-12-14 | 2011-09-07 | 绍兴文理学院 | Thin-wall stainless steel tube small-radium bending process and mold |
| CN103331345A (en) * | 2013-07-10 | 2013-10-02 | 西北工业大学 | Stretch-bending forming device with insulated stretching head and forming method thereof |
| CN109482690A (en) * | 2018-10-31 | 2019-03-19 | 南京航空航天大学 | A kind of electric current auxiliary rolling formation method of difficult-to-deformation material odd-shaped cross section pipe fitting |
| CN110014060A (en) * | 2019-04-16 | 2019-07-16 | 哈尔滨工业大学 | A kind of low-grade fever tube current auxiliary rotary draw bending device and method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114160625A (en) * | 2021-12-01 | 2022-03-11 | 吉林大学 | Pulse current assisted rapid bending forming method for magnesium alloy pipe |
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Application publication date: 20210126 |
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