CN111167915A - Method for improving bottom forming precision of complex three-dimensional thin-wall part - Google Patents
Method for improving bottom forming precision of complex three-dimensional thin-wall part Download PDFInfo
- Publication number
- CN111167915A CN111167915A CN202010028866.9A CN202010028866A CN111167915A CN 111167915 A CN111167915 A CN 111167915A CN 202010028866 A CN202010028866 A CN 202010028866A CN 111167915 A CN111167915 A CN 111167915A
- Authority
- CN
- China
- Prior art keywords
- pressure
- complex
- die
- wall part
- dimensional thin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 45
- 239000007788 liquid Substances 0.000 claims abstract description 15
- 230000002441 reversible effect Effects 0.000 claims abstract description 9
- 230000002093 peripheral effect Effects 0.000 claims abstract description 4
- 238000007493 shaping process Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 9
- 238000004458 analytical method Methods 0.000 claims description 5
- 230000002829 reductive effect Effects 0.000 claims description 4
- 238000004088 simulation Methods 0.000 claims description 4
- 229910000838 Al alloy Inorganic materials 0.000 abstract description 3
- 229910000861 Mg alloy Inorganic materials 0.000 abstract description 3
- 229910001069 Ti alloy Inorganic materials 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000000956 alloy Substances 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910001234 light alloy Inorganic materials 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 229910000601 superalloy Inorganic materials 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001502 supplementing effect Effects 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
- 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
- B21D26/021—Deforming sheet bodies
-
- 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
- B21D26/021—Deforming sheet bodies
- B21D26/031—Mould construction
Landscapes
- 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 belongs to the field of metal plate forming, and particularly relates to a part with a complex shape, which is manufactured by adopting alloy materials such as high-performance and difficult-to-form aluminum alloy, magnesium alloy, titanium alloy and the like, and is applied to the field of manufacturing high-end equipment such as aerospace and the like. Specifically discloses a method for improving the bottom forming precision of a complex three-dimensional thin-wall part, which comprises the following steps: after die assembly, hydraulic pressure is injected into the die liquid chamber to complete an initial anti-expansion process, so that the plate can obtain the shape of the complex bottom of the male die; in the later stage of the reverse expansion, a reasonable hydraulic value is kept to be loaded, and a reasonable circumferential hydraulic pressure is applied to the complex peripheral contour of the blank; when the male die is completely attached to the plate, the drawing process is completed, and then pressure maintaining and shaping are carried out; and finally, releasing the pressure, opening the die and taking out the part. The method can effectively prevent the formed part from being pulled apart due to larger tensile stress in the drawing process of the bottom of the complex three-dimensional thin-wall part, and improve the forming precision of the bottom of the complex three-dimensional thin-wall part.
Description
Technical Field
The invention belongs to the field of metal plate processing and forming, and particularly relates to a method for improving the bottom forming precision of a complex three-dimensional thin-wall part, which is suitable for high-performance alloy plates which are difficult to form such as aluminum alloy, magnesium alloy and titanium alloy or parts with complex shapes, and is applied to the high-end technical fields of aviation, aerospace, automobile lightweight and the like.
Background
High-end technical development of aviation, aerospace, automobile light weight and the like continuously requires high performance, light weight, high reliability and high precision of parts, so that the used materials are light in weight, high in strength and difficult to deform, such as high-performance aluminum alloy, magnesium alloy, titanium alloy and the like. Particularly, in the field of automobiles, the trend of light weight, high quality and complex shape is rapidly progressing, and the forming process of automobile covering parts and structural parts needs to be improved and improved urgently in order to meet the requirements of light weight, energy conservation and environmental protection. Aiming at the requirement and the challenge, aiming at the front edge of advanced forming manufacturing research, the invention provides a method for improving the forming precision of the bottom of a complex three-dimensional thin-wall part, and the forming precision of the part is improved. Hydromechanical deep drawing forming is an advanced forming mode in the field of sheet deep drawing forming at present, water, oil, particles, rubber and the like are used as force transmission media to replace a traditional rigid die, so that the sheet is greatly improved in the aspects of formability, forming quality and the like. However, the technology has some defects for forming parts with complex structures, particularly the defects are that a blank is not tightly attached to a die at a local round angle of a complex structural part, and analysis is that after deep drawing is completed, the local part of the complex part is subjected to a larger radial tensile stress, so that a gap exists between the tightly attached part and a plate material, and the forming quality of a formed part is influenced.
Therefore, the existing deep drawing forming technology has certain limitation in the aspect of improving the forming quality of the complex part, and the problems that how to improve the formability of the bottom of the complex three-dimensional thin-wall part in hydro-mechanical deep drawing forming and how to further improve the forming quality of the bottom of the complex three-dimensional thin-wall part are needed to be solved at present are urgently needed.
Disclosure of Invention
Aiming at the problems in the prior art and the existing technology, the invention provides a method for improving the bottom forming precision of a complex three-dimensional thin-wall part, which is specifically operated by applying a nonlinear waveform circumferential force on a blank, can effectively prevent a plate material at the complex bottom from being reset in deep drawing, can also improve the wall thickness of the plate material at the complex three-dimensional thin-wall bottom in hydromechanical deep drawing forming, and further improves the forming quality of the deep drawing of the complex three-dimensional thin-wall bottom part.
In order to achieve the purpose, the invention provides a method for improving the bottom forming precision of a complex three-dimensional thin-wall part, which comprises the following steps:
a. the die starts to be closed, reasonable hydraulic pressure is injected into the liquid chamber of the female die to complete an initial anti-expansion process, so that the plate takes the shape of the special-shaped bottom of the male die;
b. in the later stage of reverse bulging forming, according to the die-attaching change condition of the bottom of the complex three-dimensional thin-wall part, reasonable circumferential hydraulic pressure is applied to the complex peripheral outline of the blank to assist in finishing the drawing process;
c. on the premise of keeping reasonable hydraulic loading, the male die continues to descend until the male die starts to contact with the plate, and a drawing process is carried out;
d. when the male die is completely attached to the plate, the drawing process is finished, and pressure maintaining and shaping are carried out on the complex part;
e. the hydro-mechanical deep drawing forming process is completed, and the die is released to take out the part.
More preferably, the step b is specifically: in order to ensure good die-attaching performance of the bottom of the complex three-dimensional part, three different pressures are respectively a reverse expansion pressure, a drawing pressure and a pressure maintaining pressure in a liquid chamber of a female die in the whole process from reverse expansion to pressure maintaining, and the three pressures are gradually increased;
more preferably, the step b is specifically: in the drawing process, due to the tensile stress in the deformation body, the peak value is reached at the initial drawing time, the peak value is gradually reduced in the subsequent drawing process, and the variation trend of the circumferential hydraulic pressure is determined to be increased firstly and then reduced through multiple times of simulation analysis.
More preferably, the step c specifically comprises: in the drawing step, the pressure in the liquid chamber is a drawing pressure, and the load path of the drawing pressure is a nonlinear waveform system
Generally, compared with the prior art, the above technical solution provided by the present invention mainly has the following technical advantages:
1. the technical scheme can effectively improve the formability of the blank at the bottom of the complex part in hydro-mechanical deep drawing forming and further improve the forming quality of the part.
2. The circumferential hydraulic pressure at the blank contour boundary adopts a nonlinear waveform loading path, so that not only can the wall thickness value of a part be improved, but also the forming quality of a complex part is improved, and the material supplementing speed of the part at the flange in the drawing process of a plate material and the efficiency of the whole drawing process are improved.
3. The invention can improve the minimum wall thickness value of the light alloy material forming and is better applied to the manufacturing industry.
Drawings
FIG. 1 is a schematic view of hydromechanical drawing forming;
wherein: 1-male die, 2-blank holder, 3-sealing ring, 4-female die, 5-hydraulic medium of female die liquid chamber, 6-circumferential pressurized hydraulic medium and 7-forming blank
FIG. 2 is a partial forming effect diagram during the part forming process;
FIG. 3 is a reverse inflation pressure loading path;
FIG. 4 is a circumferential pressure loading path;
FIG. 5 is a drawing pressure loading path;
fig. 6 is a dwell pressure loading path.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention are described in detail with reference to the drawings and the embodiments, which are exemplary and only explain the technical solutions of the present invention, and should not be construed as limiting the technical solutions of the present invention.
Fig. 1 is a schematic view of hydromechanical deep drawing forming, and fig. 2 is a partial forming effect view in a part forming process. When the forming is started, the blank holder 2 and the female die 4 are matched, and the sealing ring 3 is distributed on the blank holder 2 and the female die 4 while a reasonable blank holder gap is ensured. When hydraulic pressure is applied to the circumferential direction of the plate, the sealing ring 3 ensures the tightness of the radial pressurizing liquid chamber and plays a role in lubricating the plate. In the whole forming process, the three-dimensional thin-wall part is formed by using the circumferential thrust of the plate and the pressure in the liquid chamber of the female die, and the forming quality of the drawn part is further improved.
The method for improving the local forming quality of the hydromechanical deep-drawing part by circumferential pressurization comprises the following steps:
a. four different pressures are required to be set in the whole forming process, and the back expansion pressure, the drawing pressure and the pressure maintaining pressure are respectively set in the die liquid chamber, and the three pressure values are gradually increased; also the circumferential pressure exerted at the flange; the die starts to be closed, reasonable anti-expansion hydraulic pressure is injected into the die liquid chamber, and the loading path of the anti-expansion hydraulic pressure is shown in figure 3; the purpose is to make the plate material obtain the shape of the special-shaped bottom of the male die and complete the anti-expansion process;
b. in the later stage of reverse bulging forming, according to the die-attaching change condition of the bottom of the complex three-dimensional thin-wall part, reasonable circumferential hydraulic pressure is applied to the complex peripheral outline of the blank to assist in finishing the drawing process; in the drawing process, due to the tensile stress in the deformation body, the peak value is reached at the initial drawing time, the pressure gradually decreases in the subsequent drawing process, the change trend of the circumferential hydraulic pressure is determined to be increased firstly and then decreased through multiple times of simulation analysis, and the circumferential pressure loading path is shown in fig. 4;
c. on the premise of keeping reasonable hydraulic loading, the male die continues to move downwards until the male die is in contact with the plate, a drawing process is performed, the material supplement at the flange becomes very difficult along with the gradual increase of the pressure in the liquid chamber, and the loading path of the drawing pressure is determined through simulation analysis and is shown in fig. 5.
d. When the male die is completely attached to the plate, the drawing process is completed, pressure maintaining and shaping are carried out on the complex part, and the pressure maintaining pressure loading path is shown in fig. 6;
e. the hydro-mechanical deep drawing forming process is completed, and the die is released to take out the part.
It will be appreciated by those skilled in the art that the foregoing is only a preferred embodiment of the invention, and is not intended to limit the invention, and that any modification, equivalent arrangement, or other changes, which fall within the spirit and scope of the invention, should be considered to be within the scope of the invention.
Claims (4)
1. A method for improving the forming precision of the bottom of a complex three-dimensional thin-wall part comprises the following steps:
a. after the die is closed, reasonable hydraulic pressure is injected into a liquid chamber of the female die to complete an initial anti-expansion process, so that a plate material obtains the shape of the complex bottom of the male die, and the pressure in the liquid chamber is the anti-expansion pressure;
b. in the later stage of reverse bulging forming, reasonable circumferential hydraulic pressure is applied to the complex peripheral contour of the blank to assist in finishing the drawing process;
c. on the premise of keeping reasonable hydraulic loading, when the male die continues to descend to be in contact with the plate, a drawing process is carried out, and at the moment, the pressure in the liquid chamber is drawing pressure;
d. when the male die is completely attached to the plate, the drawing process is finished, the complex part is subjected to pressure maintaining and shaping, and the pressure in the liquid chamber is the pressure maintaining pressure;
e. and releasing pressure, opening the mold and taking out the part.
2. The method for improving the bottom forming precision of the complex three-dimensional thin-wall part according to the claim 1, characterized in that: in order to ensure good die-attaching performance of the bottom of the complex three-dimensional part, three different pressures are respectively a reverse expansion pressure, a drawing pressure and a pressure maintaining pressure in a liquid chamber of a female die in the whole process from reverse expansion to pressure maintaining, and the three pressures are gradually increased.
3. The method for improving the bottom forming precision of the complex three-dimensional thin-wall part according to claim 1, wherein the step b is specifically as follows: in the drawing process, due to the tensile stress in the deformation body, the peak value is reached at the initial drawing time, the peak value is gradually reduced in the subsequent drawing process, and the variation trend of the circumferential hydraulic pressure is determined to be increased firstly and then reduced through multiple times of simulation analysis.
4. The method for improving the bottom forming precision of the complex three-dimensional thin-wall part according to the claim 1, wherein the step c is specifically as follows: in the drawing step, the pressure in the hydraulic chamber is a drawing pressure, and the application path of the drawing pressure is a nonlinear waveform system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010028866.9A CN111167915B (en) | 2020-01-12 | 2020-01-12 | Method for improving bottom forming precision of complex three-dimensional thin-wall part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010028866.9A CN111167915B (en) | 2020-01-12 | 2020-01-12 | Method for improving bottom forming precision of complex three-dimensional thin-wall part |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111167915A true CN111167915A (en) | 2020-05-19 |
| CN111167915B CN111167915B (en) | 2022-03-18 |
Family
ID=70624471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010028866.9A Expired - Fee Related CN111167915B (en) | 2020-01-12 | 2020-01-12 | Method for improving bottom forming precision of complex three-dimensional thin-wall part |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111167915B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114535393A (en) * | 2022-01-18 | 2022-05-27 | 桂林电子科技大学 | Stepped pre-expansion forming processing device and method for stepped part |
| CN115138745A (en) * | 2022-05-27 | 2022-10-04 | 北京航空航天大学 | Multi-pass rigid-flexible composite forming method and device for overall heat shield of aero-engine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10105683C1 (en) * | 2001-02-08 | 2002-06-06 | Konrad Schnupp | Hydraulic shaping press, for metal plates, has feed units which charge the tool at structured volumes and pressures, in a simple hydraulic flow system, to give short press cycle times |
| CN101274343A (en) * | 2008-05-19 | 2008-10-01 | 哈尔滨理工大学 | Device for improving forming limit in hydromechanical deep drawing of sheet material and method thereof |
| CN101318205A (en) * | 2008-06-24 | 2008-12-10 | 南京航空航天大学 | Circumferential nature supercharging plate liquid filling deep-drawing forming method and apparatus |
-
2020
- 2020-01-12 CN CN202010028866.9A patent/CN111167915B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10105683C1 (en) * | 2001-02-08 | 2002-06-06 | Konrad Schnupp | Hydraulic shaping press, for metal plates, has feed units which charge the tool at structured volumes and pressures, in a simple hydraulic flow system, to give short press cycle times |
| CN101274343A (en) * | 2008-05-19 | 2008-10-01 | 哈尔滨理工大学 | Device for improving forming limit in hydromechanical deep drawing of sheet material and method thereof |
| CN101318205A (en) * | 2008-06-24 | 2008-12-10 | 南京航空航天大学 | Circumferential nature supercharging plate liquid filling deep-drawing forming method and apparatus |
Non-Patent Citations (3)
| Title |
|---|
| 丛艳丽: "基于数值模拟内凹底筒形件充液反胀成形工艺的研究", 《中国优秀硕士学位论文全文数据库 工程科技I辑》 * |
| 曾一畔 等: "加载路径对铝合金航空复杂薄壁构件主动式充液成形性能的影响", 《塑性工程学报》 * |
| 曾元松: "《航空钣金成形技术》", 30 June 2014 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114535393A (en) * | 2022-01-18 | 2022-05-27 | 桂林电子科技大学 | Stepped pre-expansion forming processing device and method for stepped part |
| CN115138745A (en) * | 2022-05-27 | 2022-10-04 | 北京航空航天大学 | Multi-pass rigid-flexible composite forming method and device for overall heat shield of aero-engine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111167915B (en) | 2022-03-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Nakagawa et al. | Various applications of hydraulic counter-pressure deep drawing | |
| CN108380802B (en) | A kind of circulation revolving die squeezes upsetting forming device and method | |
| CN107617664B (en) | Rigid-flexible composite forming process for large complex multi-characteristic plate part | |
| CN111167915B (en) | Method for improving bottom forming precision of complex three-dimensional thin-wall part | |
| CN100418658C (en) | Procesing equipment capable of improving plate part formation limitation and method therefor | |
| CN2774673Y (en) | Thermal hydraulic forming mould unit for magnesium alloy plate | |
| CN105689486B (en) | A kind of inside high-pressure forming method and device of multistage continuous large deformation part | |
| CN109158458B (en) | Method for performing liquid-filled bending on pipe by using composite filling medium | |
| CN112588931B (en) | Ultralow-temperature medium pressure forming method for curved surface part with complex shape | |
| CN111408660B (en) | Flange-free edge forming method of thin-wall metal sheet metal component | |
| CN110434216B (en) | Integral liquid filling forming method for large annular lip piece | |
| CN104607526B (en) | Intra-pipe high pressure forming system | |
| CN101318205B (en) | Circumferential nature supercharging plate liquid filling deep-drawing forming method and apparatus | |
| Deng et al. | Precision forging technology for aluminum alloy | |
| CN102921791B (en) | Section-variable hollow component forming device and method | |
| CN110834047B (en) | Internal pressure forming method for large-size thin-wall pipe fitting gas-liquid mixed fluid | |
| CN109127851A (en) | A kind of manufacturing process based on hydraulic aluminium alloy sheet part | |
| CN109570318A (en) | A kind of gas turbine exhaust road abutment wall sheet metal component fluid forming method | |
| CN210333988U (en) | Aluminum alloy battery case forming die and upper die thereof | |
| CN107803423A (en) | A kind of shaped structure and manufacturing process for manufacturing lightweight automobile rim | |
| KR20130123651A (en) | Aluminium wheel and method for manufacturing the same | |
| CN104624771B (en) | A kind of device of the forming limit improving metal tube | |
| Yao et al. | Design of an innovative multi-stage forming process for a complex aeronautical thin-walled part with very small radii | |
| CN110860598B (en) | Method for improving warm hydromechanical deep drawing forming die attaching performance through active radial pressurization | |
| CN206305278U (en) | A kind of thin-walled wave disc flexible forming apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220318 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |