CN114453469A - Titanium alloy pipe, hot bending forming method thereof and hot bending forming tool - Google Patents
Titanium alloy pipe, hot bending forming method thereof and hot bending forming tool Download PDFInfo
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- CN114453469A CN114453469A CN202210135443.6A CN202210135443A CN114453469A CN 114453469 A CN114453469 A CN 114453469A CN 202210135443 A CN202210135443 A CN 202210135443A CN 114453469 A CN114453469 A CN 114453469A
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 153
- 238000013003 hot bending Methods 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000008093 supporting effect Effects 0.000 claims abstract description 75
- 238000005452 bending Methods 0.000 claims abstract description 65
- 238000010438 heat treatment Methods 0.000 claims description 27
- 238000000137 annealing Methods 0.000 claims description 9
- 230000035882 stress Effects 0.000 claims description 9
- 238000005488 sandblasting Methods 0.000 claims description 6
- 230000009466 transformation Effects 0.000 claims description 5
- 238000009966 trimming Methods 0.000 claims description 5
- 230000032683 aging Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 8
- 230000037303 wrinkles Effects 0.000 abstract description 8
- 239000003921 oil Substances 0.000 description 10
- 238000003825 pressing Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000010687 lubricating oil Substances 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
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Classifications
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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
- B21D9/08—Bending tubes using mandrels or the like in press brakes or between rams and anvils or abutments; Pliers with forming dies
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The invention relates to a titanium alloy pipe, a hot bending forming method thereof and a hot bending forming tool, wherein the hot bending forming tool comprises: the at least two supporting units are arranged at intervals, and two opposite ends of each supporting unit can abut against the inner wall of the tube cavity of the titanium alloy tube; the at least two supporting pads are respectively arranged at two opposite ends of each supporting unit, and each supporting pad is limited between the corresponding supporting pad and the inner wall of the tube cavity of the titanium alloy tube; wherein, each support pad is constructed to be capable of following the bending of the titanium alloy pipe to generate deformation when the titanium alloy pipe is subjected to hot bending forming. The hot bending forming tool can play a role in shape-maintaining support for the inner wall of the pipe cavity of the bending section of the large-size thin-wall titanium alloy pipe, so that the roundness of the bent pipe can be obviously improved, and the generation of inward bending wrinkle defects can be inhibited.
Description
Technical Field
The invention relates to the technical field of titanium alloy material processing, in particular to a titanium alloy pipe and a hot bending forming method and a hot bending forming tool thereof.
Background
With the gradual application of titanium alloy in the fields of marine equipment, petrochemical industry, heat exchange and the like in recent years, the pipe forming technology of the titanium alloy has become the key direction of the development and application of the current titanium alloy. Especially in the fields of marine equipment, petrochemical industry and the like, a large number of large-size steel pipes and copper pipes need to be replaced by titanium alloy pipes.
At present, although the preparation technology of large-size titanium alloy straight pipes is mastered in China, the bending and forming of titanium alloy pipes are mostly concentrated on small-size pipes with the diameter smaller than 100mm, and the bending and forming of large-size thin-wall titanium alloy pipes are basically in a blank state.
The bending forming of the large-size thin-wall titanium alloy pipe mainly has the following problems: firstly, the deformation resistance is large, the deformation is easy to rebound, and the bending angle is difficult to control accurately; secondly, the plasticity is poor, and the deformation is easy to crack; the flowability of the material is poor, the thinning amount of the outer wall and the thickening amount of the inner wall of the pipe are difficult to control, and the inner wall is easy to wrinkle; fourthly, the roundness control difficulty of the bent pipe is high.
Disclosure of Invention
Therefore, it is necessary to provide a titanium alloy pipe, a hot bending forming method thereof and a hot bending forming tool thereof, which can improve the roundness of a bent pipe and suppress the generation of inward bending wrinkle defects, aiming at the problems that the roundness of the bent pipe is difficult to control and wrinkles are easily generated on the inner wall of the bent pipe in the bending forming process of the current large-size thin-wall titanium alloy pipe.
According to an aspect of the application, a hot bending forming tool is provided for hot bending forming of a titanium alloy pipe, the hot bending forming tool comprises:
the at least two supporting units are arranged at intervals, and two opposite ends of each supporting unit can abut against the inner wall of the tube cavity of the titanium alloy tube;
the at least two supporting pads are respectively arranged at two opposite ends of each supporting unit, and each supporting pad is limited between the corresponding supporting pad and the inner wall of the tube cavity of the titanium alloy tube;
wherein each supporting pad is configured to be capable of generating deformation along with the bending of the titanium alloy pipe when the titanium alloy pipe is subjected to hot bending forming.
In one embodiment, a limiting groove is formed at an end of the supporting unit, and the supporting pad is limited in the limiting groove.
In one embodiment, the outline shape of the part of each supporting unit abutting against the inner wall of the lumen of the titanium alloy pipe is matched with the outline shape of the corresponding part of the inner wall of the lumen of the titanium alloy pipe.
In one embodiment, each of the supporting units includes:
the first die and the second die are arranged at intervals and respectively abutted against the inner wall of the tube cavity of the titanium alloy tube;
and the rigid connector is matched and connected between the first die and the second die and can respectively provide supporting force for the first die and the second die to abut against the inner wall of the tube cavity of the titanium alloy tube.
According to another aspect of the present application, there is also provided a hot bending forming method, in which a hot bending forming tool is used to perform hot bending forming on a titanium alloy pipe, the hot bending forming tool is the above hot bending forming tool, and the hot bending forming method includes the following steps:
placing the hot bending forming tool in a tube cavity of the titanium alloy tube;
heating the titanium alloy pipe and the hot bending forming tool together to a temperature above a titanium alloy phase transformation point;
bending the titanium alloy pipe to a preset bending radius;
and removing the hot bending forming tool in the pipe cavity of the titanium alloy pipe.
In one embodiment, after the press bending the titanium alloy pipe to a preset bending radius, before the removing the hot bending forming tool in the pipe cavity of the titanium alloy pipe, the method further includes the steps of:
and performing stress relief annealing below the phase change point of the titanium alloy together with the titanium alloy pipe and the hot bending forming tool.
In one embodiment, after the removing the hot bending tool in the cavity of the titanium alloy pipe, the method further includes the steps of:
and finishing the tube shape of the titanium alloy tube.
In one embodiment, after the trimming the tubular shape of the titanium alloy tubular product, the method further comprises the steps of:
and carrying out aging treatment on the titanium alloy pipe.
In one embodiment, after the trimming the tubular shape of the titanium alloy tubular product, the method further comprises the steps of:
and carrying out acid washing or sand blasting treatment on the outer wall of the inner cavity of the titanium alloy pipe.
According to another aspect of the application, a titanium alloy pipe is also provided, and is prepared by the hot bending forming method.
According to the titanium alloy pipe, the hot bending forming method and the hot bending forming tool thereof, each supporting pad can be abutted and attached to the inner wall of the pipe cavity of the titanium alloy pipe opposite to the supporting pad by means of the corresponding supporting unit, and the supporting pads are constructed to be always abutted and attached to the inner wall of the pipe cavity of the titanium alloy pipe opposite to the supporting pad when the titanium alloy pipe is subjected to hot bending forming. Therefore, the roundness of the bent pipe can be obviously improved and the generation of the inward-bending wrinkle defect can be inhibited through the shape-preserving supporting effect of the hot bending forming tool on the inner wall of the pipe cavity of the bending section of the large-size thin-wall titanium alloy pipe.
Drawings
Fig. 1 is a schematic structural view of a hot bending tool for hot bending a titanium alloy pipe according to an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a supporting unit of the hot roll forming tool shown in FIG. 1;
FIG. 3 is a schematic structural diagram of another view of the supporting unit of the hot roll forming tool shown in FIG. 1;
FIG. 4 is a schematic structural diagram of a support pad of the hot roll forming tool shown in FIG. 1 from two different viewing angles;
FIG. 5 is a schematic flow chart illustrating a method for hot roll forming a titanium alloy tube according to an embodiment of the present disclosure;
fig. 6 is a schematic flow chart of a method for hot roll forming a titanium alloy pipe according to a preferred embodiment of the present application.
100. Hot bending and forming the tooling; 110. a support unit; 111. a first die; 112. a second mold; 113. a limiting groove; 114. a fastening member; 120. a support pad; 200. a titanium alloy tube.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Referring to fig. 1, a hot bending tool 100 disclosed in at least one embodiment of the present application is disposed in a lumen of a titanium alloy tube 200, and is supported on an inner wall of the lumen of the titanium alloy tube 200 for hot bending of the titanium alloy tube 200. It should be noted that the hot bending forming tool 100 in the embodiment of the present application may be used for hot bending forming a large-sized thin-walled titanium alloy pipe 200, and specifically may be a titanium alloy pipe 200 with an outer diameter of 400-800 mm and a wall thickness of 10-50 mm.
Referring to fig. 1 to 4, the hot roll forming tool 100 includes at least two supporting units 110 and at least two supporting pads 120. At least two supporting units are arranged at intervals, and two opposite ends of each supporting unit 110 can abut against the inner wall of the lumen of the titanium alloy tube 200. At least two supporting pads 120 are respectively disposed at two opposite ends of each supporting unit 110, and each supporting pad is limited between the corresponding supporting pad and the inner wall of the lumen of the titanium alloy tube.
In order to facilitate the limit of the supporting pad of each supporting unit, in some embodiments, the end of the supporting unit is provided with a limit groove, and the supporting pad is limited in the limit groove.
Specifically, in practical application, each support pad can be abutted and attached to the inner wall of the lumen of the titanium alloy tube 200 opposite to the support pad by means of the corresponding support unit, and is configured to be always abutted and attached to the inner wall of the lumen of the titanium alloy tube 200 opposite to the support pad when the titanium alloy tube 200 is subjected to hot bending molding.
In some embodiments, the outline shape of the portion of each support unit 100 abutting the inner wall of the lumen of the titanium alloy tube 200 matches the outline shape of the corresponding portion of the inner wall of the lumen of the titanium alloy tube 200. In this way, each supporting unit 110 is facilitated to hold the inner wall of the lumen of the curved section of the shaped titanium alloy tube 200.
In some embodiments, referring to fig. 2 and 3, each of the supporting units 110 includes a first mold 111, a second mold 112, and a fixing member 114. The first die 111 and the second die 112 are spaced from each other and abut against the inner wall of the lumen of the titanium alloy tube 200.
In some embodiments, the fastening member 114 is coupled between the first die 111 and the second die 112, and is capable of providing a supporting force to the first die 111 and the second die 112, respectively, to abut against the inner wall of the lumen of the titanium alloy tube 200. The fastening member 114 is detachably connected between the first mold 111 and the second mold 112. For example, the fastening member 114 may be a double-threaded fastening bolt, which can serve to connect and fix the first die 111 and the second die 112.
The first die 111 and the second die 112 can be butted to form a circle or an approximate circle with a radius R, wherein R is 2.5-5 mm smaller than the radius of the titanium alloy pipe 200 so as to be placed in the pipe cavity of the titanium alloy pipe 200. The first die 111 is made of a high temperature alloy, and a central cross section of the first die 111 along the radial direction of the titanium alloy tube 200 may be a semicircle or an approximate semicircle, and a central cross section along the axial direction of the titanium alloy tube 200 may be a trapezoid. The first mold 111 has a height of R/2-R3/4, and an arc-shaped groove is formed at an end thereof away from the second mold 112 to form a limiting groove 113. The second die 112 may be made of a high temperature alloy, and a central cross section of the second die 112 along a radial direction of the titanium alloy tube 200 may be a semicircular shape or an approximately semicircular shape, and a central cross section along an axial direction of the titanium alloy tube 200 may be a trapezoidal shape. The second die 112 may have a height of R/2-R3/4, and an end thereof away from the first end is formed with an arc-shaped recess to form a limiting groove 113.
The at least two deformable support pads 120 include a first pad and a second pad. The first gasket is in the shape of an arc matched with the shape of the limiting groove 113 on the first die 111, can be made of a high-elasticity steel plate, has the same thickness as the limiting groove 113 on the first die 111, is 5-10 mm smaller than the limiting groove 113 on the first die 111 in width, and is convenient to mount. The second gasket is in the shape of an arc matched with the shape of the limiting groove 113 on the second die 112, can be made of a high-elasticity steel plate, has the same thickness as the limiting groove 113 on the second die 112, and is 5-10 mm smaller than the limiting groove 113 on the second die 112 in width, so that the installation is convenient.
It can be understood that one side of the first gasket and the second gasket, which is far away from each other, is always kept on the inner wall of the lumen of the titanium alloy tube 200, and the other side, which is close to each other, is displaced relative to the limiting groove 113 where the first gasket and the second gasket are respectively located along with the bending of the titanium alloy tube 200. Therefore, in some embodiments, a lubricant, such as a lubricating oil, is applied between the supporting pad 120 and the limiting groove 113, so as to reduce the resistance of the titanium alloy tube 200 in hot bending and reduce the wear of the supporting pad 120 and the groove bottom of the limiting groove 113.
In practical application, before the titanium alloy pipe 200 is subjected to hot bending forming, at least two supporting units 110 abut against the inner wall of the titanium alloy pipe 200, and at least two deformable supporting pads 120 abut against and are attached to the whole groove bottom of each supporting unit 110 and the whole inner wall of the pipe cavity of the titanium alloy pipe 200; in the process of hot bending the titanium alloy tube 200, each supporting pad 120 can deform along with the bending of the titanium alloy tube 200 and always abut against and attach to all the groove bottoms of the corresponding supporting units 110 and all the inner walls of the tube cavities of the titanium alloy tube 200. Therefore, the roundness of the bent pipe can be obviously improved and the generation of the inner bending wrinkle defect can be inhibited through the shape-preserving supporting effect of the hot bending forming tool 100 on the inner wall of the pipe cavity of the bending section of the large-size thin-wall titanium alloy pipe 200.
Referring to fig. 5, as the same concept of the present application, there is also provided a hot bending method for hot bending a titanium alloy pipe 200 by using the hot bending tool 100, including the following steps:
s610: a titanium alloy pipe 200 and a hot roll forming tool 100 are provided.
Specifically, the preparation of the large-size titanium alloy straight pipe is finished by adopting methods such as peripheral rolling, forging, ring rolling and the like, and the outer wall of the inner cavity of the pipe is finely machined to the required size and roughness.
Furthermore, the number of the supporting units 110 required for bending is calculated according to the pipe bending radius, for example, 2 to 6.
It should be noted that the larger the bending radius of the pipe, the larger the number of support units 110 required for bending. Further, it can be understood that the hot bending forming tool 100 can be used for bending bent pipes with different bending radii, complex continuous bending and space bending of pipes with the same specification.
S620: and placing the hot bending forming tool 100 into the cavity of the titanium alloy pipe 200.
Specifically, the supporting unit 110 and the supporting pad 120 are combined into the lumen of the tube material in the manner shown in fig. 1, and a high-temperature lubricant is applied between the supporting unit 110 and the supporting plate, and then the fastening member 114 is adjusted so that the supporting unit 110 presses the supporting pad 120 and the lumen inner wall of the tube material.
S630: heating the titanium alloy pipe 200 and the hot bending forming tool 100 to a temperature above the phase transformation point of the titanium alloy.
Specifically, the titanium alloy pipe 200 and the hot bending forming tool 100 assembly are heated to 40-100 ℃ above the titanium alloy transformation point T beta under the medium frequency coil, and then are quickly transferred to a press bending station.
S640: and bending the titanium alloy pipe 200 to a required bending radius.
Specifically, the titanium alloy tube 200 may be press-bent by an oil press.
Further, the titanium alloy pipe 200 can be bent to the required bending radius by the oil press for multiple times, so that the deformation process of the titanium alloy pipe 200 is uniform, the tissue uniformity is improved, and the hot bending forming quality of the titanium alloy pipe 200 is improved.
Further, the titanium alloy pipe 200 with the hot bending forming tool 100 can be subjected to original temperature remelting among multiple bending processes, and the process is repeated until the pipe is bent to the final size. Therefore, the residual stress of the titanium alloy pipe 200 can be synchronously and effectively eliminated in the bending process of the titanium alloy pipe 200, so that the springback is prevented, and the bending precision of the pipeline is improved.
S660: and removing the hot bending forming tool 100 in the pipe cavity of the titanium alloy pipe 200.
In some embodiments, referring to fig. 6, after S640 and before S660, the method further includes the following steps:
s650: and performing stress relief annealing below the phase transition point of the titanium alloy together with the titanium alloy pipe 200 and the hot bending forming tool 100.
Specifically, the titanium alloy pipe 200 after bending and the hot bending forming tool 100 are subjected to stress relief annealing at a temperature of 30-50 ℃ below a transformation point T beta.
Further, if solution treatment is required, it can be done simultaneously in this step.
Further, after annealing, the titanium alloy tube 200 is cooled to room temperature.
In some embodiments, after S660, the following steps are further included:
s670: trimming the tubular shape of the titanium alloy tubular product 200.
Further, the support pad 120 of the hot roll forming tool 100 is restored to its original shape for the next use.
After S670, the method further includes the following steps:
s680: and carrying out aging treatment on the titanium alloy pipe 200.
Specifically, the mechanical and service properties required for the titanium alloy tube 200 may be improved by aging treatment.
After S680, the method further includes the following steps:
s690: and performing acid washing or sand blasting treatment on the outer wall of the inner cavity of the titanium alloy pipe 200.
Specifically, the oxide layer on the outer wall surface of the inner lumen of the titanium alloy tube 200 can be completely removed by pickling or sand blasting.
The hot bending forming method can be used for carrying out hot bending forming treatment on the large-size thin-wall titanium alloy pipe 200 with the outer diameter of 400-800 mm and the wall thickness of 10-50 mm, the roundness of the bent pipe of the large-size thin-wall titanium alloy pipe 200 after hot bending forming is good, the defect of inward bending wrinkles is few, and the blank of the hot bending forming of the large-size thin-wall titanium alloy pipe 200 is made up.
The following are specific examples:
example 1
In this embodiment, the bending of the large-sized TA24 titanium alloy tube 200 with the outer diameter of 426mm and the wall thickness of 10mm is completed, the bending radius is 700mm, and the bending angle is 128 degrees. The specific implementation content comprises the following steps:
(1) prefabricating a large TA24 titanium alloy pipe section with an outer diameter of 426mm and a wall thickness of 10mm, wherein the length of the pipe is 1500 +/-50 mm;
(2) selecting a hot bending forming tool 100 with a specification of phi 400mm, selecting 5 supporting units 110 according to the requirement of the bending radius, determining the bending middle point of the pipe, aligning one of the 5 supporting units 110 positioned in the middle with the bending middle point, completing the assembly of the hot bending forming tool 100 and the titanium alloy pipe 200 according to the figure 1, and smearing a high-temperature lubricating coating between the supporting units 110 and the supporting pad 120;
(3) heating the combined body of the hot bending forming tool 100 and the titanium alloy pipe 200 under a medium-frequency heating coil until the temperature of the inner wall of the pipe cavity reaches 980 ℃, and preserving the heat for 10 minutes;
(4) pressing the assembly to a bending angle of 165 degrees under an oil press, and transferring the hot bending forming tool 100 to a heating working section;
(5) heating the combined body under a medium-frequency heating coil until the temperature of the inner wall of the tube cavity reaches 980 ℃, and preserving the heat for 10 minutes;
(6) pressing the assembly to a bending angle of 150 degrees under an oil press, and transferring the hot bending forming tool 100 to a heating working section;
(7) heating the combined body under a medium-frequency heating coil until the temperature of the inner wall of the tube cavity reaches 980 ℃, and preserving the heat for 10 minutes;
(8) pressing the assembly to a bending angle of 135 degrees under an oil press, and transferring the hot bending forming tool 100 to a heating working section;
(9) heating the combined body under a medium-frequency heating coil until the temperature of the inner wall of the tube cavity reaches 980 ℃, and preserving the heat for 10 minutes;
(10) pressing the assembly to a bending angle of 128 degrees under an oil press, and transferring the hot bending forming tool 100 to a heating working section;
(11) stress relief annealing the assembly at 880 ℃;
(12) and after the stress relief annealing is finished, the internal hot bending forming tool 100 is removed and slightly shaped, and then the surface of the outer wall of the inner cavity of the titanium alloy pipe 200 is subjected to sand blasting treatment, so that the bending work of the pipe is finished.
The ovality of the large-sized TA24 titanium alloy pipe 200 bent by the embodiment with the outer diameter of 426mm and the wall thickness of 10mm is less than or equal to 9 percent, the reduction rate of the outer arc wall is less than or equal to 18 percent, and the inner arc wall has no defects of folds and the like, thereby meeting higher technical requirements.
Example 2
In the embodiment, the bending of the large-size TA24 titanium alloy pipe 200 with the outer diameter of 270mm and the wall thickness of 10mm is completed, the bending radius is 500mm, and the bending angle is 120 degrees. The specific implementation content comprises the following steps:
(1) prefabricating a large-size TA24 titanium alloy pipe section with the outer diameter of 270mm and the wall thickness of 10mm, wherein the length of the pipe is 1500 +/-50 mm;
(2) selecting a hot bending forming tool 100 with a phi 260mm specification, selecting 5 supporting units 110 according to the bending radius requirement, determining a pipe bending middle point, aligning one of the 5 supporting units 110 to the bending middle point, assembling the hot bending forming tool 100 and a titanium alloy pipe 200 into a combined body according to the structure shown in fig. 1, and smearing a high-temperature lubricating coating between the supporting units 110 and a supporting pad 120;
(3) heating the combined body under a medium-frequency heating coil until the temperature of the inner wall of the tube cavity reaches 980 ℃, and preserving the heat for 10 minutes;
(4) pressing the assembly to a bending angle of 165 degrees under an oil press, and transferring the hot bending forming tool 100 to a heating section;
(5) heating the combined body under a medium-frequency heating coil until the temperature of the inner wall of the tube cavity reaches 980 ℃, and preserving the heat for 10 minutes;
(6) pressing the assembly to a bending angle of 150 degrees under an oil press, and transferring the hot bending forming tool 100 to a heating working section;
(7) heating the combined body under a medium-frequency heating coil until the temperature of the inner wall of the tube cavity reaches 980 ℃, and preserving the heat for 10 minutes;
(8) pressing the assembly to a bending angle of 135 degrees under an oil press, and transferring the hot bending forming tool 100 to a heating working section;
(9) heating the combined body under a medium-frequency heating coil until the temperature of the inner wall of the tube cavity reaches 980 ℃, and preserving the heat for 10 minutes;
(10) pressing the assembly to a bending angle of 120 degrees under an oil press, and transferring the hot bending forming tool 100 to a heating working section;
(11) stress relief annealing the assembly at 880 ℃;
(12) and after the stress relief annealing is finished, the hot bending forming tool 100 is removed and slightly shaped, and then the surface of the outer wall of the inner cavity of the titanium alloy pipe 200 is subjected to sand blasting treatment, so that the bending work of the pipe is finished.
The ovality of the large-sized TA24 titanium alloy pipe 200 bent by the embodiment with the outer diameter of 270mm and the wall thickness of 10mm is less than or equal to 7 percent, the reduction rate of the outer arc wall is less than or equal to 15 percent, and the inner arc wall has no defects of folds and the like, thereby meeting higher technical requirements.
According to another aspect of the application, a titanium alloy pipe 200 is also provided, which is prepared by the hot bending forming method, and the roundness of the bent pipe is obviously improved, and the generation of the inward bending wrinkle defect is less.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The utility model provides a hot bending forming frock for hot bending forming titanium alloy tubular product, its characterized in that, hot bending forming frock includes:
the at least two supporting units are arranged at intervals, and two opposite ends of each supporting unit can abut against the inner wall of the tube cavity of the titanium alloy tube;
the at least two supporting pads are respectively arranged at two opposite ends of each supporting unit, and each supporting pad is limited between the corresponding supporting pad and the inner wall of the tube cavity of the titanium alloy tube;
wherein each supporting pad is configured to be capable of generating deformation along with the bending of the titanium alloy pipe when the titanium alloy pipe is subjected to hot bending forming.
2. The hot bending tool according to claim 1, wherein a limiting groove is formed in an end of the supporting unit, and the supporting pad is limited in the limiting groove.
3. The hot roll forming tooling as claimed in claim 1, wherein the outline shape of the portion of each supporting unit abutting against the inner wall of the tube cavity of the titanium alloy tube is matched with the outline shape of the corresponding portion of the inner wall of the tube cavity of the titanium alloy tube.
4. The hot roll forming tooling of claim 1, wherein each support unit comprises:
the first die and the second die are arranged at intervals and respectively abutted against the inner wall of the tube cavity of the titanium alloy tube;
and the rigid connector is matched and connected between the first die and the second die and can respectively provide supporting force for the first die and the second die to abut against the inner wall of the tube cavity of the titanium alloy tube.
5. A hot bending forming method for performing hot bending forming on a titanium alloy pipe by using a hot bending forming tool, wherein the hot bending forming tool is the hot bending forming tool according to any one of claims 1 to 4, and the hot bending forming method comprises the following steps:
placing the hot bending forming tool in a tube cavity of the titanium alloy tube;
heating the titanium alloy pipe and the hot bending forming tool together to a temperature above a titanium alloy transformation point;
bending the titanium alloy pipe to a preset bending radius;
and removing the hot bending forming tool in the pipe cavity of the titanium alloy pipe.
6. The hot roll forming method according to claim 5, wherein after the bending the titanium alloy pipe to a preset bending radius and before the removing the hot roll forming tool in the pipe cavity of the titanium alloy pipe, the method further comprises the following steps:
and performing stress relief annealing below the phase change point of the titanium alloy together with the titanium alloy pipe and the hot bending forming tool.
7. The hot roll forming method according to claim 6, further comprising, after the removing the hot roll forming tool in the cavity of the titanium alloy tube, the steps of:
and finishing the tubular shape of the titanium alloy tubular product.
8. The method of hot roll forming according to claim 7, further comprising, after said trimming of the tubular shape of the titanium alloy tubular stock, the steps of:
and carrying out aging treatment on the titanium alloy pipe.
9. The method of hot roll forming according to claim 8, further comprising, after said trimming of the tubular shape of the titanium alloy tubular stock, the steps of:
and carrying out acid washing or sand blasting treatment on the outer wall of the inner cavity of the titanium alloy pipe.
10. A titanium alloy pipe material, characterized by being produced by the hot-roll forming method according to any one of claims 5 to 9.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS589723A (en) * | 1981-07-10 | 1983-01-20 | Mitsubishi Electric Corp | Bending method for metallic pipe |
| CN102581092A (en) * | 2012-02-28 | 2012-07-18 | 江阴中南重工股份有限公司 | Inner core die for bent pipe |
| CN103658273A (en) * | 2012-09-11 | 2014-03-26 | 北京首宏钢重型装备技术有限公司 | Combined core mould and pipe fitting bending mould |
| CN105478595A (en) * | 2016-01-20 | 2016-04-13 | 二重集团（德阳）重型装备股份有限公司 | Gap type manufactured core die of nuclear power voltage stabilizer fluctuation pipe and manufacturing method |
| CN111069370A (en) * | 2019-11-19 | 2020-04-28 | 中国船舶重工集团公司第七二五研究所 | Numerical control heating bending forming method for thick-wall titanium alloy pipe |
| CN112139318A (en) * | 2020-09-09 | 2020-12-29 | 南昌航空大学 | Titanium alloy bending die and machining method thereof |
-
2022
- 2022-02-14 CN CN202210135443.6A patent/CN114453469A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS589723A (en) * | 1981-07-10 | 1983-01-20 | Mitsubishi Electric Corp | Bending method for metallic pipe |
| CN102581092A (en) * | 2012-02-28 | 2012-07-18 | 江阴中南重工股份有限公司 | Inner core die for bent pipe |
| CN103658273A (en) * | 2012-09-11 | 2014-03-26 | 北京首宏钢重型装备技术有限公司 | Combined core mould and pipe fitting bending mould |
| CN105478595A (en) * | 2016-01-20 | 2016-04-13 | 二重集团（德阳）重型装备股份有限公司 | Gap type manufactured core die of nuclear power voltage stabilizer fluctuation pipe and manufacturing method |
| CN111069370A (en) * | 2019-11-19 | 2020-04-28 | 中国船舶重工集团公司第七二五研究所 | Numerical control heating bending forming method for thick-wall titanium alloy pipe |
| CN112139318A (en) * | 2020-09-09 | 2020-12-29 | 南昌航空大学 | Titanium alloy bending die and machining method thereof |
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