CN113319208A - Method for eliminating residual stress of cold drawn pipe - Google Patents
Method for eliminating residual stress of cold drawn pipe Download PDFInfo
- Publication number
- CN113319208A CN113319208A CN202110449083.2A CN202110449083A CN113319208A CN 113319208 A CN113319208 A CN 113319208A CN 202110449083 A CN202110449083 A CN 202110449083A CN 113319208 A CN113319208 A CN 113319208A
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- China
- Prior art keywords
- cold drawn
- drawn pipe
- liquid
- residual stress
- eliminating
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000007788 liquid Substances 0.000 claims abstract description 57
- 238000007789 sealing Methods 0.000 claims abstract description 24
- 238000002347 injection Methods 0.000 claims abstract description 20
- 239000007924 injection Substances 0.000 claims abstract description 20
- 238000003825 pressing Methods 0.000 claims abstract description 11
- 238000004140 cleaning Methods 0.000 claims abstract description 6
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 239000012530 fluid Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 244000137852 Petrea volubilis Species 0.000 description 1
- 238000010622 cold drawing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
- B21D39/08—Tube expanders
- B21D39/20—Tube expanders with mandrels, e.g. expandable
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention discloses a method for eliminating residual stress of a cold drawn pipe, which comprises a cold drawn pipe sealing step, a liquid injection step and a cleaning step, wherein the two ends of the cold drawn pipe are sealed, so that a sealed accommodating space is formed in the cold drawn pipe; injecting liquid into the accommodating space to fill the accommodating space with the liquid, applying pressure to the inner side wall of the cold drawn pipe by using the liquid pressure until the cold drawn pipe expands, and maintaining the liquid pressure for a preset time; and releasing the pressure and discharging the liquid in the accommodating space to obtain the cold drawn pipe for eliminating the residual stress. The components used in the method have simple structures, do not need complex equipment, form a sealed containing space by closing two ends of the cold drawn pipe, and inject liquid into the containing space, wherein the liquid applies pressure to the inner side wall of the cold drawn pipe to expand the cold drawn pipe, so that the residual stress in the cold drawn pipe can be thoroughly eliminated.
Description
Technical Field
The invention relates to the technical field of residual stress elimination, in particular to a method for eliminating residual stress of a cold drawn pipe.
Background
The hydraulic pipe for large engineering machinery has extremely high requirements on the size and shape precision, and is basically cold drawn at present. The method for eliminating the residual stress in the cold drawn pipe mainly comprises two methods: firstly, heat treatment; and the other is repeated bending straightening.
Most enterprises generally adopt heat treatment annealing to eliminate residual stress for cold drawn pipe treatment of engineering machinery, and because the pipe is longer, the requirement on the temperature uniformity of a heat treatment heating furnace is high, the implementation difficulty is higher, so that the pipe fitting is easy to deform after stress relief annealing, the axial straightness is ultra-poor, cold straightening is needed, the product still has larger residual stress which is not uniformly distributed, and the size and the shape precision of the pipe after subsequent machining are influenced.
Some enterprises adopt a roller straightening machine, namely, a cold drawn pipe is repeatedly bent, so that the residual stress is eliminated by deformation, and although the roller straightening has high automation degree and production efficiency and good pipe axial straightness, the residual stress of the pipe cannot be completely eliminated due to bending deformation, a certain amount of residual stress which is distributed unevenly still exists in the pipe, and the size and shape precision of the pipe can still be changed during subsequent machining or direct use.
Disclosure of Invention
The invention aims to provide a method for eliminating residual stress of a cold-drawn pipe, which aims to solve the problem that the residual stress in the cold-drawn pipe cannot be completely eliminated in the prior art.
The invention is realized by adopting the following technical scheme:
the invention provides a method for eliminating residual stress of a cold drawn pipe, which comprises the following steps:
and (3) sealing the cold drawn tube: sealing two ends of the cold drawn pipe to form a sealed accommodating space in the cold drawn pipe;
liquid injection step: injecting liquid into the accommodating space to fill the accommodating space with the liquid, applying pressure to the inner side wall of the cold drawn pipe by using the liquid pressure until the cold drawn pipe expands, and maintaining the liquid pressure for a preset time;
cleaning: and releasing the pressure and discharging the liquid in the accommodating space to obtain the cold drawn pipe for eliminating the residual stress.
Further, in the step of closing the cold drawn pipe, both ends of the cold drawn pipe are closed by fixing the core rod in the cold drawn pipe.
Further, the holding space that the plug encloses synthetic seal with the cold drawn pipe through the sealing washer or the holding space that the plug welded in the cold drawn pipe and enclosed synthetic seal with the cold drawn pipe.
Further, the plug includes connecting rod and two shrouding that the interval set up, the connecting rod both ends respectively with two the shrouding is connected, two the shrouding is used for sealing respectively the both ends of cold drawn pipe, just the connecting rod with the cold drawn pipe is the interval setting.
Furthermore, the core rod comprises two push blocks arranged at intervals, the two push blocks are respectively used for sealing two ends of the cold drawn pipe, and the push blocks resist the pressure applied to the push blocks by the internal liquid through external thrust.
Further, the method also comprises a step of fixing a clamping piece between the step of sealing the cold drawn pipe and the step of injecting liquid, wherein the clamping piece is fixed outside the cold drawn pipe, and two ends of the cold drawn pipe are clamped between the clamping piece and the core rod.
Further, the clamping piece comprises two end covers, internal threads are arranged on the end covers, and external threads matched with the internal threads are arranged on the outer side walls of the two ends of the cold drawn pipe.
Furthermore, the clamping piece is a mold, four pressing plates are arranged on the mold, and the four pressing plates are respectively pressed on the outer side walls at the two ends of the cold drawn pipe in a group of two.
Further, in the liquid injection step, a liquid injection hole is formed in the core rod in a penetrating mode, and liquid enters the accommodating space through the liquid injection hole.
Furthermore, an avoiding hole for avoiding the liquid injection hole is formed in the end cover.
Compared with the prior art, the invention has the beneficial effects that:
the components used in the method have simple structures, do not need complex equipment, form a sealed containing space by closing two ends of the cold drawn pipe, and inject liquid into the containing space, wherein the liquid applies pressure to the inner side wall of the cold drawn pipe to expand the cold drawn pipe, so that the residual stress in the cold drawn pipe can be thoroughly eliminated.
Drawings
FIG. 1 is a partial cross-sectional view of a cold drawn pipe installed on a residual stress relieving apparatus of the cold drawn pipe according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is an enlarged view of a portion of FIG. 1 at B;
FIG. 4 is a partial cross-sectional view of a cold drawn pipe mounted on a residual stress relieving device of the cold drawn pipe according to a second embodiment of the present invention;
FIG. 5 is an enlarged view of a portion of FIG. 4 at C;
fig. 6 is a partial sectional view of a cold drawn pipe mounted on a residual stress relieving device of the cold drawn pipe according to a third embodiment of the present invention;
FIG. 7 is a cross-sectional view taken along line D-D of FIG. 6;
FIG. 8 is a partial cross-sectional view of a cold drawn pipe mounted on a residual stress relieving apparatus of the cold drawn pipe according to a fourth embodiment of the present invention;
fig. 9 is a cross-sectional view of E-E in fig. 8.
In the figure:
10. a core rod; 11. mounting grooves; 12. a connecting rod; 13. closing the plate; 14. a liquid injection hole; 15. a push block; 20. a retaining member; 21. an end cap; 211. avoiding holes; 22. a mold; 221. pressing the plate; 30. a seal ring; 40. soldering tin; 50. cold drawing the tube; 60. an accommodation space.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that, in the premise of no conflict, the embodiments or technical features described below can be arbitrarily combined to form a new embodiment.
Referring to fig. 1 to 9, the present invention discloses a method for eliminating residual stress of a cold drawn pipe, which needs to use a residual stress eliminating device of the cold drawn pipe, the residual stress eliminating device of the cold drawn pipe comprises a core rod 10, a clamping member 20 and a sealing ring 30, the sealing ring 30 can also be replaced by soldering tin 40, the cold drawn pipe 50 in this embodiment is preferably a straight pipe body, the cold drawn pipe 50 is suitable for a boom of a large crane, the method for eliminating residual stress of the cold drawn pipe is hereinafter referred to as the method, the method comprises the following steps:
and (3) cleaning the cold drawn pipe 50: polishing the inner and outer surfaces of the two ends of the cold drawn pipe 50 by using sand paper to remove rust, and cleaning the cold drawn pipe by using water;
and (3) closing the cold drawn tube 50: fixing the core rod 10 in the cold drawn pipe 50 and closing two ends of the cold drawn pipe 50, wherein the core rod 10 and the cold drawn pipe 50 enclose a sealed accommodating space 60, and the rest parts of the core rod 10 except the two ends are not contacted with the cold drawn pipe 50;
fixing the clamping part 20: fixing the clamping piece 20 outside the cold drawn pipe 50, wherein the clamping piece 20 acts on the cold drawn pipe 50 and abuts against the core rod 10, two ends of the cold drawn pipe 50 are clamped between the clamping piece 20 and the core rod 10, and the clamping piece 20 and the core rod 10 are used for compressing and fixing the two ends of the cold drawn pipe 50;
liquid injection step: injecting liquid into the accommodating space 60 to fill the accommodating space 60 with the liquid, wherein the liquid is preferably a high-pressure fluid medium, when the amount of the injected high-pressure fluid medium is enough, the high-pressure fluid medium applies uniform pressure F1 to the inner side wall of the cold drawn pipe 50 until the cold drawn pipe 50 generates a certain degree of bulging plastic strain, then stopping injecting the liquid, and maintaining the pressure of the liquid for a preset time, wherein the injection amount of the liquid is determined by the thickness of the cold drawn pipe 50;
cleaning: and releasing the pressure and discharging the liquid in the accommodating space 60, and then sequentially disassembling the clamping piece 20 and the core rod 10 to obtain the cold drawn pipe 50 for eliminating the residual stress.
The method for eliminating the residual stress of the cold drawn pipe by combining the steps has the following four implementation modes:
the first embodiment is as follows:
referring to fig. 1 to 3, in the present embodiment, in the step of closing the drawn pipe 50, the mandrel 10 and the drawn pipe 50 are enclosed to form the sealed accommodating space 60, the sealing rings 30 are preferably O-rings, the number of the sealing rings 30 is two, two ends of the mandrel 10 are respectively recessed with mounting grooves 11, and the sealing rings 30 are mounted in the mounting grooves 11 and abut against the inner side wall of the drawn pipe 50 to perform a sealing function.
The mandrel 10 comprises a connecting rod 12 and two seal plates 13 arranged at intervals, the seal plates 13 are circular, two ends of the connecting rod 12 are respectively connected with the two seal plates 13, the two seal plates 13 respectively seal two ends of the cold drawn pipe 50 through two seal rings 30, the connecting rod 12 and the cold drawn pipe 50 are arranged at intervals in parallel, and two mounting grooves 11 are respectively concavely arranged on the outer side walls of the two seal plates 13.
In the fixed card of holding 20 step, hold a 20 and include two end covers 21, the inboard of end cover 21 is provided with the internal thread, be provided with on the lateral wall at the both ends of cold drawn pipe 50 with internal thread matched with external screw thread, end cover 21 and the 50 thread fixed connection of cold drawn pipe, end cover 21 mainly has two effects: firstly, the outer surfaces of two ends of the cold drawn pipe 50 are restrained, and sealing failure caused by pipe end bulging of the cold drawn pipe 50 is prevented; secondly, the axial shrinkage of the pipe end of the cold drawn pipe 50 is limited, and the cold drawn pipe 50 generates a force shrinking along the axial direction when expanding, and the force is transmitted to the end cover 21 through the thread and then transmitted to the core rod 10.
In this embodiment, in the liquid injection step, the mandrel 10 is provided with two liquid injection holes 14, the two liquid injection holes 14 are respectively provided at both end portions of the mandrel 10, the liquid enters the accommodating space 60 through the liquid injection holes 14, the cold drawn pipe 50 is pressurized with the high-pressure fluid medium, and the cold drawn pipe 50 is subjected to a certain degree of circumferential strain.
In a preferred embodiment, the pour hole 14 is L-shaped so that the force of the liquid overflowing in the reverse direction is offset by the plug 10 after the liquid is poured into the receiving space 60.
In a preferred embodiment, the end cap 21 is provided with a relief hole 211 for avoiding the liquid injection hole 14 so as to facilitate the injection of the liquid into the accommodating space 60.
Example two:
referring to fig. 4 to 5, the difference between the second embodiment and the first embodiment is: the mandrel 10 is welded to the inside of the cold drawn pipe 50 by the solder 40 so as to surround the cold drawn pipe 50 to form the sealed accommodation space 60 described above, and specifically, the seal plate 13 on the mandrel 10 is welded to the inner surface of the cold drawn pipe 50 by the solder 40.
Example three:
referring to fig. 6 to 7, the difference between the third embodiment and the first embodiment is: in the step of fixing the clamping member 20, the clamping member 20 is a mold 22, four pressing plates 221 are disposed on the mold 22, two of the four pressing plates 221 are a group and respectively pressed against the outer sidewalls of the two ends of the cold drawn tube 50, and are clamped, so that the clamping force F2 is transmitted to the cold drawn tube 50 and then transmitted to the sealing plate 13, and the pressing plates 221 and the sealing plate 13 are disposed on the inner and outer sides of the cold drawn tube 50 in a reverse manner, so as to clamp the cold drawn tube 50.
The clamp force F2 of the die 22 requires external equipment to provide or bolt-on, and if the die 22 is stationary, the die 22 will restrain the bulging and axial movement of the tube end of the cold drawn tube 50; if the die 22 is free to move axially along the drawn tube 50, the die 22 only restricts the bulging of the tube end of the drawn tube 50.
Example four:
referring to fig. 8 to 9, the difference between the fourth embodiment and the third embodiment is: the core rod 10 is changed into a split form, specifically, the core rod 10 includes two push blocks 15 arranged at intervals, the push blocks 15 are circular, the two push blocks 15 are respectively used for closing two ends of the cold drawn pipe 50, the two mounting grooves 11 are respectively recessed on the two push blocks 15, the push blocks 15 resist pressure F1, F1, which can also be called internal pressure, applied to the push blocks 15 by internal liquid through external thrust F3, and the external thrust F3 can prevent the push blocks 15 from being ejected out by the pressure F1.
The invention has the following beneficial effects:
1. the components used in the method have simple structures and do not need complex equipment;
2. the ultrahigh pressure sealing can be realized, and the device is suitable for the cold drawn pipe 50 with thicker thickness;
3. by controlling the constraint conditions of the die 22, the constraint conditions of the axial direction of the pipe end of the cold drawn pipe 50 can be controlled, and further the deformation state of the cold drawn pipe 50 during bulging is controlled;
4. the core rod 10 is changed into a split type, and is suitable for the cold drawn pipe 50 with longer length.
In summary, the components used in the method of the present invention have simple structures, and do not require complex equipment, the mandrel 10 is fixed in the drawn pipe 50, and both ends of the drawn pipe 50 are sealed to form the sealed accommodating space 60, and then the liquid is injected into the accommodating space 60, and the liquid applies pressure to the inner side wall of the drawn pipe 50 to expand the drawn pipe 50, so as to completely eliminate the residual stress in the drawn pipe 50.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (10)
1. A method of eliminating residual stress in a cold drawn pipe, said method comprising the steps of:
and (3) sealing the cold drawn tube: sealing two ends of the cold drawn pipe to form a sealed accommodating space in the cold drawn pipe;
liquid injection step: injecting liquid into the accommodating space to fill the accommodating space with the liquid, applying pressure to the inner side wall of the cold drawn pipe by using the liquid pressure until the cold drawn pipe expands, and maintaining the liquid pressure for a preset time;
cleaning: and releasing the pressure and discharging the liquid in the accommodating space to obtain the cold drawn pipe for eliminating the residual stress.
2. The method for eliminating residual stress of a cold drawn pipe according to claim 1, wherein in the step of closing the cold drawn pipe, both ends of the cold drawn pipe are closed by fixing the core rod in the cold drawn pipe.
3. The method for eliminating residual stress of a cold drawn pipe according to claim 2, wherein said mandrel is welded to said receiving space enclosed and sealed with said cold drawn pipe by a sealing ring or said mandrel is welded to said receiving space enclosed and sealed with said cold drawn pipe.
4. The method of eliminating residual stress of a cold drawn pipe according to claim 2, wherein the mandrel comprises a connecting rod and two sealing plates arranged at intervals, two ends of the connecting rod are respectively connected with the two sealing plates, the two sealing plates are respectively used for sealing two ends of the cold drawn pipe, and the connecting rod is arranged at intervals with the cold drawn pipe.
5. The method for eliminating the residual stress of the cold drawn pipe according to claim 2, wherein the mandrel comprises two push blocks which are arranged at intervals, the two push blocks are respectively used for closing two ends of the cold drawn pipe, and the push blocks resist the pressure applied to the push blocks by the internal liquid through external thrust.
6. The method for eliminating the residual stress of the cold drawn pipe according to claim 2, further comprising a step of fixing a holding member between the step of closing the cold drawn pipe and the step of injecting the liquid, the holding member being fixed outside the cold drawn pipe, both ends of the cold drawn pipe being sandwiched between the holding member and the core rod.
7. The method for eliminating the residual stress of the cold drawn pipe according to claim 6, wherein the holding member comprises two end covers, the end covers are provided with internal threads, and the outer side walls of the two ends of the cold drawn pipe are provided with external threads matched with the internal threads.
8. The method of eliminating residual stress of a cold drawn pipe according to claim 6, wherein said holding member is a mold, and said mold is provided with four pressing plates, and said four pressing plates are respectively pressed against the outer sidewalls of the two ends of said cold drawn pipe in groups of two.
9. The method for eliminating the residual stress of the cold drawn pipe according to claim 7, wherein in the liquid injection step, a liquid injection hole is formed in the core rod, and the liquid enters the accommodating space through the liquid injection hole.
10. The method for eliminating the residual stress of the cold drawn pipe according to claim 9, wherein an avoiding hole for avoiding the liquid injection hole is formed in the end cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110449083.2A CN113319208A (en) | 2021-04-25 | 2021-04-25 | Method for eliminating residual stress of cold drawn pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110449083.2A CN113319208A (en) | 2021-04-25 | 2021-04-25 | Method for eliminating residual stress of cold drawn pipe |
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| Publication Number | Publication Date |
|---|---|
| CN113319208A true CN113319208A (en) | 2021-08-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110449083.2A Pending CN113319208A (en) | 2021-04-25 | 2021-04-25 | Method for eliminating residual stress of cold drawn pipe |
Country Status (1)
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|---|---|---|---|---|
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| US4571969A (en) * | 1981-07-30 | 1986-02-25 | National Distillers And Chemical Corporation | Autofrettage process |
| US4730474A (en) * | 1985-04-01 | 1988-03-15 | Hitachi, Ltd. | Method of relieving residual stress in metal pipe |
| CN1042321A (en) * | 1988-11-02 | 1990-05-23 | 太原重型机械学院 | The hydraulic expansion method of annular work piece and device thereof |
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-
2021
- 2021-04-25 CN CN202110449083.2A patent/CN113319208A/en active Pending
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|---|---|---|---|---|
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| US4571969A (en) * | 1981-07-30 | 1986-02-25 | National Distillers And Chemical Corporation | Autofrettage process |
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| CB03 | Change of inventor or designer information |
Inventor after: Li Rongfeng Inventor after: Li Gan Inventor after: Zhu Haihui Inventor after: Peng Sheng Inventor after: He Zhubin Inventor after: Zhang Peng Inventor after: Zhang Shuyan Inventor before: Li Rongfeng Inventor before: Li Gan Inventor before: Zhu Haihui Inventor before: Peng Sheng Inventor before: He Binzhu Inventor before: Zhang Peng Inventor before: Zhang Shuyan |
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Application publication date: 20210831 |
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