CN110270620B - High-pressure forming method in pipe fitting - Google Patents
High-pressure forming method in pipe fitting Download PDFInfo
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- CN110270620B CN110270620B CN201910558969.3A CN201910558969A CN110270620B CN 110270620 B CN110270620 B CN 110270620B CN 201910558969 A CN201910558969 A CN 201910558969A CN 110270620 B CN110270620 B CN 110270620B
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 230000007704 transition Effects 0.000 claims abstract description 62
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 238000007789 sealing Methods 0.000 claims description 32
- 238000006073 displacement reaction Methods 0.000 claims description 12
- 238000007493 shaping process Methods 0.000 abstract description 13
- 239000007788 liquid Substances 0.000 description 9
- 238000002347 injection Methods 0.000 description 8
- 239000007924 injection Substances 0.000 description 8
- 238000004364 calculation method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention relates to a pipe fitting internal high-pressure forming method, and belongs to the field of pipe fitting shaping and forming. A high-pressure forming method in pipe fittings, carry on the inner high-pressure forming to wait to take shape the pipe base to get the goal pipe fittings; in the whole pressure forming process, acquiring a real-time distance delta S1 between a pipe blank at a fillet of the cross sections of the upper die and the lower die and the upper die and the lower die, and acquiring a real-time distance delta S2 between the pipe blank at least one transition surface of the upper die or the lower die and the upper die or the lower die to obtain the cross section shape of the middle pipe fitting; manufacturing an upper transition piece die and a lower transition piece die according to the acquired cross section shape of the middle pipe fitting; carrying out internal high-pressure forming by using the obtained transition piece upper die and transition piece lower die to obtain a transition pipe fitting; and placing the obtained transition pipe fitting in a lower die of the target pipe fitting for internal high-pressure forming to obtain the target pipe fitting. The method obtains the shape of the intermediate transition pipe fitting, manufactures a transition pipe fitting die, and finally shapes the intermediate transition pipe fitting, so that pressure fluctuation caused by overlarge pressure change is avoided.
Description
Technical Field
The invention relates to a pipe fitting internal high-pressure forming method, and belongs to the field of pipe fitting shaping and forming.
Background
With the continuous development of human society, energy crisis and environmental pollution become two primary problems facing the world. The number of automobiles as the 'necessities' of the current family and social activities is increasing year by year. To meet the requirements of environmental protection and energy conservation, the light weight of automobiles has become the trend of automobile development in the world.
The lightweight of the automobile reduces the preparation quality of the automobile as much as possible on the premise of ensuring the strength and the safety performance of the automobile, thereby improving the dynamic property of the automobile, reducing the fuel consumption and reducing the exhaust pollution. The automobile light structure comprises hollow variable cross-section parts, two half pieces are welded again after being formed in the traditional process, the process is complex, the quality is difficult to guarantee, and the strength of the welding position of the obtained part is also difficult to guarantee.
The internal high-pressure forming is a new forming technology, the tube blank is subjected to bulging deformation under the condition of internal high pressure in combination with axial loads at two ends, and finally the tube blank is attached to a die to be formed into a target part. The internal high pressure forming comprises two stages of forming and shaping. In the shaping step, the basically shaped pipe blank is finished, particularly, the round corner portions are jointed, the pressure required in the shaping step is large, and the pressure difference is large compared with the pressure required in the shaping step, so that the pressure change and fluctuation generated in the transition of the shaping and shaping have adverse effects on the shaping in the continuous shaping, and the shaping is poor or the material is broken due to excessive pressure.
Disclosure of Invention
The invention aims to provide a pipe fitting internal high-pressure forming method, which is characterized in that the shape of an intermediate transition pipe fitting is obtained, a transition pipe fitting die is manufactured, and then the intermediate transition pipe fitting is finally shaped, so that pressure fluctuation caused by overlarge pressure change is avoided.
A method of high pressure forming inside a pipe, the forming method comprising the steps of:
s1, placing the tube blank to be formed in a lower die of the target tube fitting, closing the upper die and the lower die, sealing by using a first sealing punch and a second sealing punch, and then carrying out pressure forming to obtain the target tube fitting; in the whole pressure forming process, acquiring a real-time distance delta S1 between a pipe blank at 4 round corners of the cross sections of the upper die and the lower die and the upper die and the lower die, and acquiring a real-time distance delta S2 between the pipe blank at least one transition surface of the upper die or the lower die and the upper die or the lower die;
s2, acquiring the value of delta S1 when delta S2 is 0, and acquiring the shape of the cross section of the intermediate pipe when delta S2 is 0 according to the value of delta S1; optionally, repeating steps S1 and S2, obtaining an average value of the values of Δ S1;
s3, manufacturing an upper transition piece die and a lower transition piece die according to the acquired cross section shape of the middle pipe fitting; carrying out internal high-pressure forming by using the obtained transition piece upper die and transition piece lower die to obtain a transition pipe fitting; and placing the obtained transition pipe fitting in a lower die of the target pipe fitting, closing the upper die and the lower die, sealing by using a first sealing punch and a second sealing punch, and then gradually pressurizing and forming to obtain the target pipe fitting.
According to the pipe fitting internal high-pressure forming method, the cross section of the target pipe fitting is a regular quadrangle of which four corners are rounded corners.
In the pipe fitting internal high-pressure forming method, the transition surface refers to an inclined surface formed at the transition position between a target pipe fitting cross section regular quadrangle and a round pipe blank.
Preferably, in the step S1, a real-time distance Δ S3 between the tube blank and the upper die or the lower die at least one critical surface of the upper die or the lower die is acquired simultaneously; and in step S2, a value of Δ S1 when both Δ S2 and Δ S3 are 0 is obtained, and a cross-sectional shape of the intermediate pipe is obtained from the value of Δ S1 when both Δ S2 and Δ S3 are 0.
In the pipe fitting internal high-pressure forming method, the critical surface refers to the position of a target pipe fitting cross section regular quadrangle close to a transition surface.
Preferably, the Δ S1, Δ S2, and Δ S3 are each obtained by a displacement sensor provided at a corresponding position in the upper mold or the lower mold.
The invention has the beneficial effects that: according to the method for forming the high pressure in the pipe fitting, disclosed by the invention, the critical state between the forming stage and the shaping stage is obtained by monitoring the whole deformation process of the pipe fitting, the shape of the intermediate transition pipe fitting is obtained, a transition pipe fitting mold is manufactured, and then the intermediate transition pipe fitting is finally shaped, so that pressure fluctuation caused by overlarge pressure change is avoided. The method can weaken large fluctuation caused by pressurization due to large pressure difference in the forming stage and the shaping stage, and avoid poor fitting or cracking in the machining process of parts.
Drawings
FIG. 1 is a schematic view of an initial blank and a target pipe die in the pipe internal high pressure forming method of the present invention;
FIG. 2 is a schematic view of a pipe blank and a target pipe fitting mold during processing in the pipe fitting internal high pressure forming method according to the present invention;
FIG. 3 is a schematic diagram of the position of a displacement sensor in the method for forming a pipe by high pressure inside a pipe according to the present invention;
FIG. 4 is a schematic view of the location of a displacement sensor with rounded corners in the section A-A of FIG. 1;
FIG. 5 is a schematic cross-sectional view of an initial blank and a target pipe die in the pipe internal high pressure forming method according to the present invention;
FIG. 6 is a schematic cross-sectional view of a tube blank and a target tube mold during processing in the tube internal high pressure forming method according to the present invention;
FIG. 7 is a cross-sectional view of an intermediate pipe in the method for forming a pipe by internal high pressure according to the present invention;
FIG. 8 is an enlarged view of a portion of FIG. 6;
the reference numbers are as follows: 1. the device comprises a target pipe fitting upper die, a target pipe fitting lower die, a first sealing punch, a first liquid injection pipe, a second sealing punch, a second liquid injection pipe, a pipe blank, a critical surface displacement sensor, a transition surface displacement sensor, a middle pipe fitting section, a fillet displacement sensor, a transition surface, a critical surface and a transition surface, wherein the target pipe fitting upper die is 2, the target pipe fitting lower die is 3, the first sealing punch is 4, the first liquid injection pipe is 5, the second sealing punch is 6, the.
Detailed Description
The technical solution of the present invention is described in detail and completely with reference to the following embodiments, and it is obvious that the described embodiments are only some examples of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The pipe fitting internal high-pressure forming method can be carried out in internal high-pressure forming equipment provided by the prior art, and the cross section of the target pipe fitting is a regular quadrangle of which four corners are rounded corners. The equipment comprises a target pipe fitting upper die 1, a target pipe fitting lower die 2, a first sealing punch 3, a first liquid injection pipe 4, a second sealing punch 5, a second liquid injection pipe 6, a control device for controlling the two sealing punches to move in the axial direction, a high-pressure liquid source and a pressurization injection device which are connected with the first liquid injection pipe 4 and the second liquid injection pipe 6, a press for controlling the target pipe fitting upper die 1 to close the die, a plurality of displacement sensors, and the displacement sensors comprise displacement sensors at three positions of a critical surface, a transition surface and a fillet, wherein the specific setting positions are shown in fig. 3 and fig. 4. According to the illustration in fig. 2, during the whole internal pressure forming process, the middle section area of the tube blank is firstly attached to the mold, then the tube sections at two ends are gradually attached to the mold, and then the attached part is an inclined plane formed at the transition position between the target tube section regular quadrangle and the round tube blank, namely a transition surface, as indicated by 201 in fig. 1. Preferably, in order to ensure that the pipe fitting part with the square cross section is completely attached, the attachment degree of the pipe fitting and the die at the critical surface can be determined by using the displacement sensor, for example, the position is marked as 202 in fig. 1. The values of Δ S1, Δ S2, and Δ S3 are monitored in real time using displacement sensors. When the critical surface 202 and the transition surface 201 are fitted to the mold, both Δ S2 and Δ S3 are 0. When the delta S2/[ delta ] S2 and the delta S3 reach 0, the die is not attached to the fillet, the delta S1 is not 0, namely, a certain distance is left between the tube blank at the fillet and the fillet of the die, the distance is delta S1, the fillet radius value of the middle transition tube under the condition can be obtained through geometric relation calculation according to the measured delta S1 and the fillet radius of the target tube, the section shape of the whole middle transition tube is further obtained, and the upper die and the lower die of the transition piece are manufactured according to the obtained section shape. And carrying out internal high-pressure forming according to the process by using the obtained transition piece upper die and the transition piece lower die to obtain the intermediate transition pipe fitting. And placing the obtained intermediate transition pipe fitting into an upper die and a lower die of the target pipe fitting for final forming, wherein in the final forming, the deformation of the pipe fitting is small, the volume of high-pressure liquid to be injected is small, the axial movement amount of the sealing punches on two sides is small, and the generation of large fluctuation is avoided.
Example 1
A method of high pressure forming inside a pipe, the forming method comprising the steps of:
s1, placing the pipe blank 7 to be formed in the lower die 2 of the target pipe fitting, closing the upper die 1 and the lower die 2, sealing by using a first sealing punch 3 and a second sealing punch 5, and then carrying out pressure forming to obtain the target pipe fitting; in the whole pressure forming process, acquiring a real-time distance delta S1 between a pipe blank 7 at 4 round corners of the cross sections of an upper die 1 and a lower die 2 and the upper die 1 and the lower die 2, and acquiring a real-time distance delta S2 between the pipe blank 7 at one transition surface 201 of the upper die 1 or the lower die 2 and the upper die 1 or the lower die 2;
s2, acquiring the value of delta S1 when delta S2 is 0, and acquiring the shape of the cross section of the middle pipe fitting when delta S2 is 0 according to the value of delta S1, wherein the shape of the cross section of the middle pipe fitting can be obtained by calculation according to geometric relations; repeating the steps S1 and S2 five times to obtain an average value of the Δ S1 values to avoid errors;
s3, manufacturing an upper transition piece die and a lower transition piece die according to the acquired cross section shape of the middle pipe fitting; carrying out internal high-pressure forming by using the obtained transition piece upper die and transition piece lower die to obtain a transition pipe fitting; and placing the obtained transition pipe fitting into a lower target pipe fitting die 2, closing the upper die 1 and the lower die 2, sealing by using a first sealing punch 3 and a second sealing punch 5, and then gradually pressurizing and forming to obtain the target pipe fitting.
Example 2
A method of high pressure forming inside a pipe, the forming method comprising the steps of:
s1, placing the pipe blank 7 to be formed in the lower die 2 of the target pipe fitting, closing the upper die 1 and the lower die 2, sealing by using a first sealing punch 3 and a second sealing punch 5, and then carrying out pressure forming to obtain the target pipe fitting; in the whole pressure forming process, acquiring a real-time distance delta S1 between a tube blank 7 at 4 round corners of the cross sections of an upper die 1 and a lower die 2 and the upper die 1 and the lower die 2, and acquiring a real-time distance delta S2 between the tube blank 7 at a transition surface 201 of the upper die 1 and the upper die 1 or the lower die 2; simultaneously acquiring the real-time distance Delta S3 between the tube blank 7 at one critical surface 202 of the upper die 1 and the upper die 1
S2, acquiring the value of delta S1 when both delta S2 and delta S3 are 0, and acquiring the shape of the cross section of the middle pipe fitting when both delta S2 and delta S3 are 0 according to the value of delta S1, wherein the shape of the cross section of the middle pipe fitting can be obtained by calculation according to geometric relations; repeating the steps S1 and S2 five times to obtain an average value of the Δ S1 values to avoid errors;
s3, manufacturing an upper transition piece die and a lower transition piece die according to the acquired cross section shape of the middle pipe fitting; carrying out internal high-pressure forming by using the obtained transition piece upper die and transition piece lower die to obtain a transition pipe fitting; and placing the obtained transition pipe fitting into a lower target pipe fitting die 2, closing the upper die 1 and the lower die 2, sealing by using a first sealing punch 3 and a second sealing punch 5, and then gradually pressurizing and forming to obtain the target pipe fitting.
Claims (3)
1. A method of high pressure forming inside a pipe, the forming method comprising the steps of:
s1, placing the pipe blank (7) to be formed in a target pipe fitting lower die (2), closing the upper die (1) and the lower die (2), sealing by using a first sealing punch (3) and a second sealing punch (5), and then carrying out pressure forming to obtain a target-form pipe fitting; in the whole pressure forming process, acquiring a real-time distance delta S1 between a pipe blank (7) at 4 round corners of the cross sections of an upper die (1) and a lower die (2) and the upper die (1) and the lower die (2), and acquiring a real-time distance delta S2 between the pipe blank (7) at least one transition surface (201) of the upper die (1) or the lower die (2) and the upper die (1) or the lower die (2);
s2, acquiring the value of delta S1 when delta S2 is 0, and acquiring the shape of the cross section of the intermediate pipe when delta S2 is 0 according to the value of delta S1; repeating the steps S1 and S2 to obtain the average value of the values of Delta S1;
s3, manufacturing an upper transition piece die and a lower transition piece die according to the acquired cross section shape of the middle pipe fitting; carrying out internal high-pressure forming by using the obtained transition piece upper die and transition piece lower die to obtain a transition pipe fitting; and placing the obtained transition pipe fitting into a lower target pipe fitting die (2), closing the upper die (1) and the lower die (2), sealing by using a first sealing punch (3) and a second sealing punch (5), and then gradually pressurizing and forming to obtain the target pipe fitting.
2. A method according to claim 1, characterized in that in step S1, the real-time distance Δ S3 between the tube blank (7) and the upper die (1) or the lower die (2) at least at one critical plane (202) of the upper die (1) or the lower die (2) is acquired simultaneously; and in step S2, a value of Δ S1 when both Δ S2 and Δ S3 are 0 is obtained, and a cross-sectional shape of the intermediate pipe is obtained from the value of Δ S1 when both Δ S2 and Δ S3 are 0.
3. Method according to claim 2, characterized in that said Δ S1, Δ S2 and Δ S3 are obtained by means of displacement sensors arranged in corresponding positions in the upper mold (1) or in the lower mold (2).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910558969.3A CN110270620B (en) | 2019-06-26 | 2019-06-26 | High-pressure forming method in pipe fitting |
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| CN201910558969.3A CN110270620B (en) | 2019-06-26 | 2019-06-26 | High-pressure forming method in pipe fitting |
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| CN110270620A CN110270620A (en) | 2019-09-24 |
| CN110270620B true CN110270620B (en) | 2021-02-19 |
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| CN113042606A (en) * | 2019-12-28 | 2021-06-29 | 烟台新科钢结构有限公司 | Process and equipment for manufacturing model-shaped steel pipe by steel pipe internal expansion method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US3611768A (en) * | 1969-06-30 | 1971-10-12 | Otsuya Tekko Kk | Bulging apparatus of metallic pipes |
| JPS5236950B2 (en) * | 1975-02-12 | 1977-09-19 | ||
| JP3389823B2 (en) * | 1997-05-30 | 2003-03-24 | トヨタ自動車株式会社 | Pulsation damping structure of pressure fluid piping |
| TWI267410B (en) * | 2002-11-08 | 2006-12-01 | Mitsubishi Motors Corp | Deformed element pipe for hydraulic bulging, hydraulic bulging device using the element pipe, hydraulic bulging method using the element pipe, and hydraulic-bulged product |
| CN202438586U (en) * | 2012-03-02 | 2012-09-19 | 张家港合瑞车桥有限公司 | Hydraulic bulging pipe end sealing device |
| CN102806248A (en) * | 2012-08-06 | 2012-12-05 | 哈尔滨工业大学 | Device and method for testing real-time changes of fillet radius along with internal pressure in internal high-pressure forming process |
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Effective date of registration: 20210128 Address after: 266700 West of Zhuzhu Road, Gulan Town, Pingdu City, Qingdao City, Shandong Province Applicant after: QINGDAO CHANGHUI PIPE INDUSTRY Co.,Ltd. Address before: 116000 room 702, west side, 7th floor, 1 Gaoxin street, Dalian hi tech Industrial Park, Liaoning Province Applicant before: Dalian Ruizheng Technology Co.,Ltd. |
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Denomination of invention: A high pressure forming method in pipe fittings Effective date of registration: 20211230 Granted publication date: 20210219 Pledgee: Qingdao Dingtai Financing Guarantee Co.,Ltd. Pledgor: QINGDAO CHANGHUI PIPE INDUSTRY Co.,Ltd. Registration number: Y2021370010147 |
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Date of cancellation: 20230206 Granted publication date: 20210219 Pledgee: Qingdao Dingtai Financing Guarantee Co.,Ltd. Pledgor: QINGDAO CHANGHUI PIPE INDUSTRY Co.,Ltd. Registration number: Y2021370010147 |
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Denomination of invention: A Method for High Pressure Forming of Pipe Fittings Effective date of registration: 20230323 Granted publication date: 20210219 Pledgee: Qingdao Dingtai Financing Guarantee Co.,Ltd. Pledgor: QINGDAO CHANGHUI PIPE INDUSTRY Co.,Ltd. Registration number: Y2023370010030 |
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Granted publication date: 20210219 Pledgee: Qingdao Dingtai Financing Guarantee Co.,Ltd. Pledgor: QINGDAO CHANGHUI PIPE INDUSTRY Co.,Ltd. Registration number: Y2023370010030 |
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Denomination of invention: A high-pressure forming method for pipe fittings Granted publication date: 20210219 Pledgee: Taiping Property Insurance Co.,Ltd. Qingdao Branch Pledgor: QINGDAO CHANGHUI PIPE INDUSTRY Co.,Ltd. Registration number: Y2024370010033 |