CN111644498A - Control method for electrothermal stretch bending process of titanium alloy section and stretch bending forming device - Google Patents
Control method for electrothermal stretch bending process of titanium alloy section and stretch bending forming device Download PDFInfo
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- CN111644498A CN111644498A CN202010534584.6A CN202010534584A CN111644498A CN 111644498 A CN111644498 A CN 111644498A CN 202010534584 A CN202010534584 A CN 202010534584A CN 111644498 A CN111644498 A CN 111644498A
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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
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/06—Bending rods, profiles, or tubes in press brakes or between rams and anvils or abutments; Pliers with forming dies
- B21D7/063—Pliers with forming dies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
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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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
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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
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/16—Auxiliary equipment, e.g. for heating or cooling of bends
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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
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/16—Auxiliary equipment, e.g. for heating or cooling of bends
- B21D7/162—Heating equipment
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Abstract
The invention discloses a control method of an electrothermal stretch bending process of a titanium alloy section and a stretch bending forming device, wherein the control method comprises the following steps: clamping the titanium alloy section and fixing the copper plate on the suspension section of the titanium alloy section; heating the titanium alloy profile; when the titanium alloy section is heated to a first set temperature, the titanium alloy section is pre-stretched and bent to form the titanium alloy section; when the bending forming of the titanium alloy section is finished, increasing the heating current, wherein the temperature of the suspended section of the titanium alloy section is lower than that of the bent section of the titanium alloy section; and when the bending section of the titanium alloy section is heated to a second set temperature, the deformed titanium alloy section is subjected to secondary drawing. The control method of the electrothermal stretch bending process of the titanium alloy section aims to solve the problems of low efficiency and high cost of the traditional titanium alloy section heating stretch bending process.
Description
Technical Field
The invention belongs to the technical field of metal forming, and particularly relates to a control method of an electrothermal stretch bending process of a titanium alloy section and a stretch bending forming device.
Background
The application of the carbon fiber reinforced composite fuselage structure to advanced civil and military aircrafts is gradually increased, and the titanium alloy material is applied to the advanced aircrafts more and more due to the potential compatibility and the impact resistance with the composite material. The titanium alloy bending section becomes the main structure of a composite material fuselage bearing component and is used for fuselage bearing frame girder stringers, central wing boxes, main landing gear mechanism supports, cabin door frames and the like, so that the forming quality of the titanium alloy bending section is directly related to the assembly precision and the service life of an airplane, becomes a technical key influencing the development of the airplane and ensuring the integral service performance of the airplane, and is also one of main factors influencing the manufacturing period, the cost and the benefit of the airplane. The electrothermal stretch bending forming technology of the titanium alloy section is used as an effective means for forming a titanium alloy section bent part, and the temperature distribution state of the section in the forming process is an important factor influencing the final appearance size precision and the residual stress of the stretch bending part of the titanium alloy section, so that the research on the control technology of the electrothermal stretch bending process of the titanium alloy section with high efficiency and economy is of great significance.
The prior art for controlling the temperature uniformity of titanium alloy profiles in the electrothermal stretch bending process comprises the following steps:
(1) method for heating mould by electric heating belt connected with section bar in parallel
The method comprises heating a mold with an electric heating belt connected in parallel with a section, and forming a section by electric heating stretch bending, wherein the section comprises a stretch bending machine, a stretch bending mold and a temperature sensor, the stretch bending mold is processed into a hollow shape, the electric heating belt connected in parallel with the section is placed in the hollow shape, then the temperature sensor is connected to the inner surface of the molded surface of the stretch bending mold contacted with the section for temperature measurement, the section and the heating belt are electrified simultaneously in the stretch bending process, the contact surface of the stretch bending mold and the section is heated to a preset temperature, and then stretch bending is carried out. The electric heating belt heating mould connected with the section in parallel is adopted, the section and the mould are heated to the preset temperature in a parallel mode, the heating is difficult to achieve, the hollow structure in the stretch bending mould is complex, the difficulty of the mould preparation process is high, and the reliability of the heated hollow stretch bending mould in the stretch bending forming process is insufficient.
(2) Method for heating mould by using incubator with heating device
The method adopts a mixed type section bar electric heating stretch bending method combining section bar self-resistance heating and a heating box. The heating rod is added into the stretch bending die to heat the die, the die and the section bar are wrapped in a heating box arranged on a workbench of a stretch bending machine, a heating resistance wire is arranged on a wall plate of the heating box to assist in heating the titanium alloy section bar and the stretch bending die, and the heating efficiency and the temperature uniformity of parts are improved. The specific process is as follows: the section bar is arranged in the heating box through the side opening, two ends of the section bar are arranged in the clamp jaws to be clamped, after the clamp positions are adjusted to enable the section bar to be tangent to the vertex of the stretch bending die, the front door of the heating box is closed, the self-resistance heating system and the power supply of the heating box are started, and the section bar is heated. The temperature of the section bar is measured in real time by adopting a temperature sensor, closed-loop PID (Proportional Integral Derivative) closed-loop control is carried out by adopting a PLC (Programmable Logic Controller) according to a temperature feedback signal, and stretch bending forming is carried out after the temperature of the section bar reaches a forming temperature. The stretch bending die is heated in a mode of having the heat preservation box, the stretch bending die is integrally heated by the heating rod, the temperature rise time is long, the efficiency is low, and the energy consumption is high. In addition, when the size of the bent part changes, the mold and the incubator are both required to be reworked, which is too costly.
In view of the above, a person skilled in the art needs to provide a method for controlling an electrothermal stretch bending process of a titanium alloy profile and a stretch bending forming apparatus to solve the problems of low efficiency and high cost of the conventional heating stretch bending process of a titanium alloy profile.
Disclosure of Invention
Technical problem to be solved
The technical problem to be solved by the invention is that the traditional titanium alloy section heating stretch-bending process has low efficiency and high cost.
(II) technical scheme
The invention provides a control method of an electrothermal stretch bending process of a titanium alloy section, which comprises the following steps:
clamping a titanium alloy section and fixing a copper plate on a suspension section of the titanium alloy section;
heating the titanium alloy profile;
when the titanium alloy section is heated to a first set temperature, pre-stretching and bending the titanium alloy section;
when the bending forming of the titanium alloy profile is finished, increasing heating current, wherein the temperature of the suspended section of the titanium alloy profile is lower than that of the bent section of the titanium alloy profile;
and when the bending section of the titanium alloy section is heated to a second set temperature, the titanium alloy section is subjected to secondary stretching deformation.
Optionally, the clamping the titanium alloy profile and fixing the copper plate in front of the overhanging section of the titanium alloy profile further includes:
and determining the length of the suspended section of the titanium alloy section according to an electric heating stretch bending track control mode, wherein the length of the suspended section of the titanium alloy section is the same as that of the copper plate.
Optionally, the determining the length of the suspended section of the titanium alloy profile according to the electrothermal stretch bending trajectory control mode specifically includes the following steps:
determining a bending forming track according to a track control mode of a stretch bending mould;
and determining the length of the suspended section of the titanium alloy profile according to the bending forming track.
Optionally, before determining the length of the suspended section of the titanium alloy profile according to the electrothermal stretch bending trajectory control mode, the method further includes:
and determining the stretch bending die and the length of the titanium alloy section according to the size of the titanium alloy section.
Optionally, after determining the length of the suspended section of the titanium alloy profile according to the electrothermal stretch bending trajectory control mode, the method further includes:
and determining the resistance of the titanium alloy section and the copper plate.
Optionally, the determining the resistance of the titanium alloy profile and the copper plate specifically includes:
and determining the resistance of the titanium alloy section according to the length and the section size of the titanium alloy section, and determining the resistance of the copper plate according to a theoretical analysis and simulation analysis method.
Optionally, a conductive medium is disposed at a contact position of the copper plate and the suspended section of the titanium alloy profile.
Optionally, after the titanium alloy profile is subjected to the complementary drawing deformation, the method further includes:
and cooling the titanium alloy section after power failure.
Optionally, the titanium alloy section is an L-shaped, U-shaped, Z-shaped or T-shaped titanium alloy section.
The invention provides a stretch bending forming device applying the control method of the electrothermal stretch bending process of the titanium alloy section, which comprises a stretch bending die, a copper plate and an electric heating system, wherein the stretch bending die is provided with an insulating layer on the surface contacting with the titanium alloy section, the copper plate is connected with the suspended section of the titanium alloy section in parallel, and the positive electrode and the negative electrode of the electric heating system are respectively and electrically connected with two ends of the titanium alloy section.
(III) advantageous effects
The technical scheme of the invention has the following advantages:
the invention provides a control method of an electrothermal stretch bending process of a titanium alloy profile, which comprises the steps of clamping the titanium alloy profile and fixing a copper plate on a suspension section of the titanium alloy profile; heating the titanium alloy section by set voltage and set current; when the titanium alloy section is heated to a first set temperature, the titanium alloy section is pre-stretched and bent to form the titanium alloy section; when the bending forming of the titanium alloy section is finished, increasing the heating current, wherein the temperature of the suspended section of the titanium alloy section is lower than that of the bent section of the titanium alloy section; and when the bending section of the titanium alloy section is heated to a second set temperature, the deformed titanium alloy section is subjected to secondary drawing. The control method for the electrothermal stretch bending process of the titanium alloy profile can obviously improve the temperature uniformity of the titanium alloy profile in the electrothermal stretch bending forming process based on a simple tool structure, has short electrothermal stretch bending forming period, improves the production efficiency and greatly reduces the cost.
Drawings
Fig. 1 is a schematic flow chart of a control method for an electrothermal stretch bending process of a titanium alloy profile according to an embodiment of the present invention;
FIG. 2 is a control schematic diagram of a control method for an electrothermal stretch bending process of a titanium alloy profile according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a bending forming track in the control method of the electrothermal stretch bending process of the titanium alloy profile according to the embodiment of the present invention;
fig. 4 is a schematic view of a parallel structure of suspended sections of titanium alloy sections in a control method for an electrothermal stretch bending process of a titanium alloy section according to an embodiment of the present invention;
FIG. 5a is a schematic process diagram of a conventional electrothermal stretch-bending forming method;
FIG. 5b is a schematic process diagram of a control method for an electrothermal stretch bending process of a titanium alloy profile according to an embodiment of the present invention;
fig. 6 is a schematic flow chart of another control method for an electrothermal stretch bending process of a titanium alloy profile according to an embodiment of the present invention.
In the figure:
11. a bending section of the titanium alloy profile; 12. a suspended section of the titanium alloy profile; 21. stretch bending the mould; 22. a jaw; 3. a copper plate; 4. an insulating layer; 5. the direction of the current; 6. a conductive medium; 7. a direction of the clamping force; 8. a temperature measuring point of a suspended section of the titanium alloy profile; 9. measuring temperature points of the bending sections of the titanium alloy profiles; A. pre-stretching; B. a bending process; C. a supplementary stretching process; D. powering off; E. the current is increased.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
According to a first aspect of the embodiments of the present invention, there is provided a method for controlling an electrothermal stretch bending process of a titanium alloy profile, as shown in fig. 1, including the following steps:
s100, clamping the titanium alloy section and fixing the copper plate on a suspension section of the titanium alloy section;
s200, heating the titanium alloy section;
s300, when the titanium alloy section is heated to a first set temperature, pre-stretching and bending the titanium alloy section to form the titanium alloy section;
s400, when the bending forming of the titanium alloy section is finished, increasing heating current, wherein the temperature of the suspended section of the titanium alloy section is lower than that of the bent section of the titanium alloy section;
s500, when the bending section of the titanium alloy section is heated to a second set temperature, the deformed titanium alloy section is subjected to secondary drawing.
In this embodiment, in step S100, specifically, two ends of the titanium alloy profile are fixedly clamped at the jaws of the end of the stretch-bending forming device, the positive electrode and the negative electrode of the power supply are electrically connected to the jaws of the two ends, respectively, the copper plate is clamped at the suspended section of the titanium alloy profile, which is the titanium alloy profile that is not in contact with the die.
In some optional embodiments, before clamping the titanium alloy profile and fixing the copper plate to the flying section of the titanium alloy profile, the method further includes:
and determining the length of the suspended section of the titanium alloy section according to the electric heating stretch bending track control mode, wherein the length of the suspended section of the titanium alloy section is the same as that of the copper plate.
Specifically, as shown in fig. 2 to 4, according to the principle of performing temperature control on a titanium alloy profile based on a current splitting method shown in fig. 2, a bent part shown in fig. 3 is selected to verify the control method of the electrothermal stretch bending process of the titanium alloy profile in the present embodiment, and first, a stretch bending die is designed and manufactured according to the size of the part, and the blank length of the titanium alloy profile is determined;
and obtaining a bending forming track according to a track control mode of the stretch bending die and the stretch bending equipment, as shown in fig. 4, and determining the length of the suspended section of the titanium alloy section according to the bending track, wherein the length of the copper plate is equal to the length of the suspended section of the titanium alloy section, namely, the length of the required copper plate is determined.
In some optional embodiments, the length of the suspended section of the titanium alloy profile is determined according to an electrothermal stretch bending trajectory control mode, and the method specifically includes the following steps:
determining a bending forming track according to a track control mode of a stretch bending mould;
and determining the length of the suspended section of the titanium alloy section according to the bending forming track.
In some optional embodiments, before determining the length of the suspended section of the titanium alloy profile according to the electrothermal stretch bending trajectory control mode, the method further includes:
and determining a stretch bending die and determining the length of the titanium alloy section according to the size of the titanium alloy section.
In some optional embodiments, after determining the length of the suspended section of the titanium alloy profile according to the electrothermal stretch bending trajectory control mode, the method further includes:
and determining the resistance of the titanium alloy section and the copper plate.
Specifically, the resistance of the titanium alloy section is calculated according to the length and the section size of the titanium alloy section, and the required resistance of the copper plate, namely the section size of the copper plate, is determined by adopting a theoretical analysis and simulation analysis method.
In some optional embodiments, the electrical resistance of the titanium alloy profile and the copper plate is determined, specifically:
and determining the resistance of the titanium alloy section according to the length and the section size of the titanium alloy section, and determining the resistance of the copper plate according to a theoretical analysis and simulation analysis method.
In some alternative embodiments, as shown in fig. 4, a conductive medium is provided at the contact of the copper plate and the suspended section of the titanium alloy profile. In particular, the conductive medium can be conductive graphite paper.
In some optional embodiments, after the step of stretch-deforming the titanium alloy profile, the method further includes:
and cooling the titanium alloy section after power failure. Naturally cooling the titanium alloy section to room temperature, and then taking out the titanium alloy section to finish the whole stretch bending forming process.
As shown in fig. 5a and 5B, a comparison between the conventional electrothermal stretch-bending forming process and the stretch-bending forming process provided by the embodiment of the present invention is given, wherein both the two stretch-bending processes include a pre-stretching process a, a bending process B, and a post-stretching process C, and the conventional electrothermal stretch-bending process (as shown in fig. 5 a) is powered off D after the bending process B is completed, and then the post-stretching process C is performed; in the stretch-bending forming process (as shown in fig. 5B) provided in the embodiment of the present application, after the bending process B is completed, the current E is increased, then the compensation stretching C is performed, and in the bending process B, the temperature measurement is performed on the titanium alloy section suspended section temperature measurement point 8 and the titanium alloy section bent section temperature measurement point 9, respectively.
The results of the stretch bending test are compared as follows: the angle rebound rate of the traditional titanium alloy section formed by electric heating stretch bending is 21.43 percent, while the angle rebound rate of the titanium alloy section formed by stretch bending provided by the embodiment of the invention is 6.42 percent, and the temperature change and rebound contrast in the stretch bending process are consistent with the simulation result.
According to a first aspect of the embodiments of the present invention, another method for controlling an electrothermal stretch bending process of a titanium alloy profile is provided, as shown in fig. 6, including the following steps:
s201, determining a stretch bending die according to the size of the titanium alloy section and determining the length of the titanium alloy section;
s202, determining the length of a suspended section of the titanium alloy section according to an electric heating stretch bending track control mode;
s203, determining the resistance of the titanium alloy section and the copper plate;
s204, clamping the titanium alloy section and fixing the copper plate on the suspension section of the titanium alloy section;
s205, heating the titanium alloy section;
s206, when the titanium alloy section is heated to the first set temperature, the titanium alloy section is pre-stretched and bent to form the titanium alloy section;
s207, when the bending forming of the titanium alloy section is finished, increasing heating current, wherein the temperature of the suspended section of the titanium alloy section is lower than that of the bent section of the titanium alloy section;
s208, when the bending section of the titanium alloy section is heated to a second set temperature, the deformed titanium alloy section is subjected to secondary drawing;
and S209, cooling the titanium alloy section after power failure.
In this embodiment, the length of the titanium alloy profile and the length of the overhanging section of the titanium alloy profile, the resistance of the titanium alloy profile, the copper plate are determined before the titanium alloy profile is electrically heated.
In some alternative embodiments, the titanium alloy profile is an L-shaped titanium alloy profile. The embodiment of the invention does not limit the specific structure of the titanium alloy section, and the titanium alloy section can be T-shaped or U-shaped, and L-shaped titanium alloy sections which are relatively common.
According to a second aspect of the embodiment of the present invention, there is provided a stretch bending forming apparatus applying the control method for the electrothermal stretch bending process of the titanium alloy profile, as shown in fig. 2, the stretch bending apparatus includes a stretch bending mold 21, a copper plate 3 and an electric heating system, the stretch bending mold 21 is provided with an insulating layer 4 on a surface contacting with the titanium alloy profile, the copper plate 3 is arranged in parallel with the suspension section of the titanium alloy profile, and the positive and negative electrodes of the electric heating system are respectively electrically connected with two ends of the titanium alloy profile.
Specifically, the insulating layer 4 may be an insulating ceramic coating, the electrical heating system energizes and heats the titanium alloy profile through the jaw 22, the jaw 22 is used for fixing the titanium alloy profile, the titanium alloy profile includes a bending section 11 of the titanium alloy profile and a suspending section 12 of the titanium alloy profile, and two ends of the bending section 11 of the titanium alloy profile are connected to the suspending section 12 of the titanium alloy profile.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A control method for an electrothermal stretch bending process of a titanium alloy section is characterized by comprising the following steps:
clamping a titanium alloy section and fixing a copper plate at a suspension section of the titanium alloy section;
heating the titanium alloy profile;
when the titanium alloy section is heated to a first set temperature, pre-stretching and bending the titanium alloy section;
when the bending forming of the titanium alloy profile is finished, increasing heating current, wherein the temperature of the suspended section of the titanium alloy profile is lower than that of the bent section of the titanium alloy profile;
and when the bending section of the titanium alloy section is heated to a second set temperature, the titanium alloy section is subjected to secondary stretching deformation.
2. The method for controlling the electrothermal stretch bending process of the titanium alloy profile according to claim 1, wherein the step of clamping the titanium alloy profile and fixing the copper plate in front of the suspended section of the titanium alloy profile further comprises the following steps:
and determining the length of the suspended section of the titanium alloy section according to an electric heating stretch bending track control mode, wherein the length of the suspended section of the titanium alloy section is the same as that of the copper plate.
3. The method for controlling the electrothermal stretch bending process of the titanium alloy profile according to claim 2, wherein the determining the length of the suspended section of the titanium alloy profile according to the electrothermal stretch bending trajectory control mode specifically comprises the following steps:
determining a bending forming track according to a track control mode of a stretch bending mould;
and determining the length of the suspended section of the titanium alloy profile according to the bending forming track.
4. The method for controlling the electrothermal stretch bending process of the titanium alloy profile according to claim 3, wherein before determining the length of the suspended section of the titanium alloy profile according to the electrothermal stretch bending trajectory control mode, the method further comprises:
and determining the stretch bending die and the length of the titanium alloy section according to the size of the titanium alloy section.
5. The method for controlling the electrothermal stretch bending process of the titanium alloy profile according to claim 2, wherein after determining the length of the suspended section of the titanium alloy profile according to the electrothermal stretch bending trajectory control mode, the method further comprises:
and determining the resistance of the titanium alloy section and the copper plate.
6. The method for controlling the electrothermal stretch bending process of the titanium alloy profile according to claim 5, wherein the determining of the electric resistance of the titanium alloy profile and the copper plate specifically comprises:
and determining the resistance of the titanium alloy section according to the length and the section size of the titanium alloy section, and determining the resistance of the copper plate according to a theoretical analysis and simulation analysis method.
7. The method for controlling the electrothermal stretch bending process of the titanium alloy profile according to claim 1, wherein a conductive medium is arranged at the contact position of the copper plate and the suspended section of the titanium alloy profile.
8. The method for controlling the electrothermal stretch bending process of the titanium alloy profile according to claim 1, wherein after the step of performing the complementary stretch deformation on the titanium alloy profile, the method further comprises the following steps:
and cooling the titanium alloy section after power failure.
9. The method for controlling the electrothermal stretch bending process of the titanium alloy profile according to claim 1, wherein the titanium alloy profile is an L-shaped, U-shaped, Z-shaped or T-shaped titanium alloy profile.
10. A stretch bending forming device applying the control method of the electrothermal stretch bending process of the titanium alloy profile according to any one of claims 1 to 9, characterized by comprising a stretch bending die, a copper plate and an electric heating system, wherein the stretch bending die is provided with an insulating layer on the surface contacting with the titanium alloy profile, the copper plate is connected with the suspension section of the titanium alloy profile in parallel, and the positive electrode and the negative electrode of the electric heating system are respectively and electrically connected with two ends of the titanium alloy profile.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113305188A (en) * | 2021-02-05 | 2021-08-27 | 中国航发北京航空材料研究院 | Cold stretch bending forming method for titanium alloy thin-wall section |
| CN113510170A (en) * | 2021-05-25 | 2021-10-19 | 北京航空航天大学 | Process regulation and control method for forming curved surface component with complex section by using titanium alloy extruded section |
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| CN113510170A (en) * | 2021-05-25 | 2021-10-19 | 北京航空航天大学 | Process regulation and control method for forming curved surface component with complex section by using titanium alloy extruded section |
| CN113510170B (en) * | 2021-05-25 | 2022-06-24 | 北京航空航天大学 | Process regulation and control method for forming curved surface component with complex section by using titanium alloy extruded section |
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