CN101934339B - Ring-shaped electro-plastic rivet-free riveting device - Google Patents
Ring-shaped electro-plastic rivet-free riveting device Download PDFInfo
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- CN101934339B CN101934339B CN201010288778A CN201010288778A CN101934339B CN 101934339 B CN101934339 B CN 101934339B CN 201010288778 A CN201010288778 A CN 201010288778A CN 201010288778 A CN201010288778 A CN 201010288778A CN 101934339 B CN101934339 B CN 101934339B
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- 150000001875 compounds Chemical class 0.000 claims abstract description 27
- 230000003116 impacting effect Effects 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 abstract description 17
- 239000010959 steel Substances 0.000 abstract description 17
- 239000000463 material Substances 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 8
- 229910021652 non-ferrous alloy Inorganic materials 0.000 abstract description 8
- 208000037656 Respiratory Sounds Diseases 0.000 abstract description 5
- 238000005246 galvanizing Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 13
- 239000004411 aluminium Substances 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 239000000956 alloy Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 229910000881 Cu alloy Inorganic materials 0.000 description 3
- 239000003562 lightweight material Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 229910000861 Mg alloy Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- XTYUEDCPRIMJNG-UHFFFAOYSA-N copper zirconium Chemical compound [Cu].[Zr] XTYUEDCPRIMJNG-UHFFFAOYSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 239000000446 fuel Substances 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 229910001234 light alloy Inorganic materials 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
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- Connection Of Plates (AREA)
Abstract
The invention relates to a ring-shaped electro-plastic rivet-free riveting device in the technical field of riveting. In the invention, a blank holder, a workpiece and a concave die are orderly arranged from the top down; a compound punch is sleeved in the blank holder; the compound punch, the blank holder and the concave die are coaxially arranged; the concave die is in a structure with an upper cylindrical table fixedly connected with a lower cylindrical table, wherein the diameter of the upper cylindrical table is less than that of the lower cylindrical table; a ring-shaped electric brush is connected with the cylinder outer surface of the upper cylindrical table via threads, the upper surface of the ring-shaped electric brush is flush with the upper surface of the upper cylindrical table, the diameter of the ring-shaped electric brush is greater than that of the lower cylindrical table, and the part of the lower surface of the ring-shaped electric brush, which exceeds the diameter of the lower cylindrical table, is evenly distributed with a plurality of leads along the circumferential direction. The invention leads in the electro-plastic effect of a material through galvanizing current with a certain magnitude in the deformation direction of the material; therefore, the problem that the large deformation place of a joint is easy to crackle and even embrittle when a brittle hard non-ferrous alloy plate is riveted without rivet is solved, the plastic deformation resistance during the riveting of the advanced high-strength steel is effectively reduced, and the comprehensive connection quality of the joint is enhanced.
Description
Technical field
What the present invention relates to is a kind of riveting set of mechanical engineering technical field, specifically is that a kind of annular Electroplastic does not have the rivet device.
Background technology
In recent years, along with petroleum resources reduce the continuous aggravation with environmental pollution day by day, be the trend of the times that the body of a motor car lightweight of target becomes automobile industry development with lifting automobile fuel ecomomy and environmental-protecting performance.The application of novel light materials such as non-ferrous alloy such as aluminium, magnesium material and advanced high-strength steel becomes the light-weighted important means of body of a motor car naturally.Yet non-ferrous alloy such as aluminium, magnesium material thermal conductivity is good, conductance is high and alloying reaction takes place Yi Yutong; Simultaneously the fusing point of above-mentioned non-ferrous alloy and advanced high-strength steel is with thermal expansion coefficient difference is huge and the hard and crisp intermetallic compound of easy formation during melting welding; Be difficult to form effective joint when therefore, adopting the traditional resistor spot welding method to connect above-mentioned non-ferrous alloy or non-ferrous alloy and high-strength steel.
The problem that exists when adopting resistance spot welding process to connect above-mentioned lightweight material has proposed a kind of interconnection technique that is called no rivet (Clinching) abroad.Because this technology is a kind of cold deformation ability of utilizing plate itself; It is carried out pressure processing; Make plate produce local large deformation and connect a kind of plate interconnection technique together; A series of problems that the input of a large amount of heats caused when therefore efficiently and effectively had been avoided because of melting facts have proved that this method can obtain to have the joint of good quiet dynamic mechanical.Yet when the light-alloy workpiece of bad plasticity such as riveted joint cast aluminium, magnesium alloy, make the material production crackle reduce the joint fatigue behaviour easily, have in addition embrittlement takes place, directly cause joint fails; And when the advanced high-strength steel of riveted joint; Because its intensity high (yield strength of some advanced high-strength steel even greater than 1000Mpa), resistance of deformation is bigger, the plastic deformation difficulty; Increased the requirement of equipment on the one hand, increased production cost towards riveting ability, riveting gun C type frame stiffness; On the other hand, the advanced high strength steel plate of deformation makes that the joint forming property is relatively poor, and quality of connection is not high.
The microcosmic mechanism of metal plastic deformation shows; The essence of plastic deformation is the generation and the motion of a large amount of dislocations, because the motion of dislocation and mutual effect, in plastic history; Entanglement that produces dislocation and dislocation and second are reached mutually the phenomenons such as reaction of crystal defect; Thereby hindered the motion of dislocation, formed work hardening, made plastic deformation be difficult to continue.Yet existing result of study shows that material (especially metal material) drag that under the effect of moving electron (electric current or electric field), can deform sharply descends, the phenomenon that plasticity obviously improves, i.e. Electroplastic effect.Therefore can be in the Metal Forming process; On its deformation direction, apply high-density current, thereby form the electron wind that is produced by moving electron in metal inside, electron wind promotes the motion of metal dislocation and overcomes the obstacle in the motion; Alleviated the FORCEF FIT phenomenon; Reduced resistance of deformation, made it that plastic deformation take place more easily, forming property is greatly enhanced.
Summary of the invention
The present invention is directed to the above-mentioned deficiency that prior art exists, provide a kind of annular Electroplastic not have the rivet device.The present invention introduces the Electroplastic effect of metal material; Increased the ductility of fragility alloy in lightweight materials such as cast aluminium, magnesium alloy; Reduced the requirement of equipment towards riveting ability and riveting gun C type frame stiffness; Improve the joint forming property when riveting advanced high strength steel plate, improved cost performance of the present invention.
The present invention realizes through following technical scheme:
The present invention includes: compound punch, blank holder, annular brush and die, wherein: blank holder, workpiece and die from top to bottom are provided with successively, and compound punch is socketed in the blank holder, the coaxial setting of compound punch, blank holder and die.
The outward flange of the bottom of described blank holder is provided with annular boss workpiece when guaranteeing that blank holder presses down and contacts well with annular brush.
Described compound punch is made up of with impacting to overlap conducting rod, and both connect through screw thread.
The head of described conducting rod is to have the structure that the two rounding frustums up and down of identical cone angle are connected, and the big footpath of last rounding frustum equals conducting rod body of rod parallel-segment diameter, and the big footpath of following rounding frustum is less than the path of last rounding frustum.
Described rounding frustum side down is provided with screw thread.
Described impact cover is the hollow cone tubular; The inside and outside wall cone angle of awl tube is all identical with conducting rod head rounding frustum cone angle; The inwall that impacts cover is provided with screw thread and is threaded with following rounding frustum, and conducting rod head protrusion impacted cover lower surface certain distance when assembling was accomplished.
The structure that described die is connected for two cylinder tables up and down, the cylinder table diameter is less than cylinder table down it on, last cylinder table hits exactly and is provided with rounding frustum cavity, this cavity be provided with circular arc chamfering all around.
The bottom centre of described die cavity is provided with cylindrical protrusions, and the center line of this protruding center line and compound punch is consistent.
Described cylindrical protrusions diameter is less than the diameter of die center counterbore, and being provided with the cross section between two diameters is semicircular annular groove.
Described annular brush is connected through screw thread with last cylinder table cartridge outer surface, and it is surperficial concordant with the upper surface of last cylinder table to guarantee that simultaneously annular electro brushes.
Described annular brush diameter is greater than following cylinder table diameter, and electric current evenly circulated when the part edge of cylinder table diameter circumferentially evenly was furnished with multiple conducting wires with the assurance energising under its lower surface exceeded.
Described conducting rod and annular brush are processed by zirconium copper alloy, chrome copper or nisiloy copper alloy.
Described impact cover, blank holder and die are processed by high-strength insulating material or the surperficial steel that scribble coatings.
During apparatus of the present invention work, earlier workpiece is positioned on the die; The drive pressure flange is with Work-sheet pressing; Start compound punch and move downward and be pressed into plate gradually, force plate generation plastic deformation, when the degree of depth that is pressed into plate when compound punch reaches top plate thickness, between the conducting rod of compound punch and annular brush, pass to a certain size direct current; Along with continuation towards the riveting process; Two-layer up and down plate receives the influence of Electroplastic effect on direct current conducting direction, to be more prone to take place plastic deformation; The generation of riveted joint crackle when both having avoided the riveted joint of fragility non-ferrous alloy material; Rivet force when also having reduced the riveted joint high-strength steel simultaneously makes plate more be prone to get into the die cavity, finally between plate and plate, forms mechanical interlocked; After the riveting completion, cut off direct current, compound punch and blank holder are return initial station, and annular Electroplastic does not have rivet to be accomplished.
The present invention compares prior art and has the following advantages: the present invention rationally utilizes the Electroplastic effect of material; Through in no rivet process, on the material deformation direction, it being applied electric current; Make material more be prone to take place plastic deformation; Increase the ductility of fragility non-ferrous alloy material on the one hand, effectively avoided the generation of riveted joint crackle and embrittlement; Reduced the rivet force when riveting advanced high-strength steel on the other hand, improved the plastic deformation ability of high-strength steel, make more be prone between plate and the plate to form firm mechanical interlocked, the quality of connection of joint when having improved the riveted joint high-strength steel.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the die structural representation;
Wherein: (a) do not contain the die structural representation of annular brush, (b) for containing the die assembling sketch map of annular brush.
Fig. 3 is an annular electro brush configuration sketch map.
Fig. 4 is the embodiment process chart.
The specific embodiment
Elaborate in the face of embodiments of the invention down, present embodiment provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment being to implement under the prerequisite with technical scheme of the present invention.
As shown in Figure 1; Present embodiment comprises: compound punch 1, blank holder 2, annular brush 3 and die 4; Wherein: blank holder 2, workpiece 5 and die 4 from top to bottom are provided with successively, and compound punch 1 is socketed in the blank holder 2, compound punch 1, blank holder 2 and die 4 coaxial settings.
The bottom of described blank holder 2 from outer rim and in to be provided with width be 4.4mm, highly contact well with annular brush 3 for the annular boss 6 of 0.2mm workpiece 5 when guaranteeing that blank holder 2 presses down.
Described compound punch 1 is made up of conducting rod 7 and impact cover 8, and both connect through screw thread.
The head of described conducting rod 7 is to have the structure that the two rounding frustums up and down of 12 ° of cone angles are connected; The big footpath of last rounding frustum equals conducting rod 7 body of rod parallel-segment diameters for 7.8mm; The frustum height is 3.2mm, and the big footpath of following rounding frustum is 7.1mm, frustum height 6.2mm.
Described impact cover 8 is the hollow cone tubular; The internal and external walls cone angle is all 12 ° mutually with conducting rod 7 head rounding frustum cone angles, and impacting cover 8 top external diameters is 7.1mm, and internal diameter is 4.4mm; Highly be 6mm, conducting rod 7 heads protrusion impacted cover 8 lower surface 0.2mm when promptly assembling was accomplished.
Shown in Fig. 2 (a), the structure that described die 4 is connected for two cylinder tables up and down, cylinder table 9 diameters are 14mm on it; Highly be 3mm; Following cylinder table 10 diameters are 20mm, and it is 2.65mm that last cylinder table 9 centers are provided with the degree of depth, and base diameter is 8.7mm; Cone angle is 20 ° a rounding frustum cavity 11, is provided with the circular arc chamfering that radius is 0.5mm around this cavity 11.
The center of described rounding frustum cavity 11 is provided with cylindrical protrusions 12, and protruding 12 highly is 0.6mm, and diameter is 6.4mm, is provided with the semicircular annular groove that diameter of section is 1.8mm between convexity 14 and the rounding frustum cavity 11.
Shown in Fig. 2 (b), the height of described annular brush 3 and last cylinder table 9 cartridge outer surfaces is identical and connect through screw thread, and annular brush 3 upper surfaces are concordant with the upper surface of last cylinder table 9 when guaranteeing to assemble.
As shown in Figure 3, described annular brush 3 external diameters are 24mm, and internal diameter is 14mm, and electric current evenly circulated when the part edge of cylinder table 10 diameters circumferentially evenly was furnished with 8 leads 13 with the assurance energising under its lower surface exceeded.
Described annular brush 3 is processed by the nisiloy copper alloy with conducting rod 7.
Described impact cover 8, blank holder 2 and die 4 are processed by high-strength insulating material.
Technological parameter: the impact velocity of compound punch 1 is 100mm/min, and impact stroke is 3.6mm, and electrical current is 800A.
The present embodiment implementing procedure is positioned over workpiece 5 on the die 4 shown in Fig. 4 (a)～(e); Drive pressure flange 2 compresses workpiece 5; Start compound punch 1 and move downward and be pressed into plate 5 gradually, force plate 5 that plastic deformations take place, when the degree of depth that is pressed into plate 5 when compound punch 1 reaches 2mm, between the conducting rod 7 of compound punch 1 and annular brush 3, pass to the direct current of 800A; Along with continuation towards the riveting process; Two-layer up and down plate 5 receives the influence of Electroplastic effect on direct current conducting direction, to be more prone to take place plastic deformation; Both reduced rivet force, and also made plate more be prone to get into the cavity 13 of die 4 simultaneously, finally between plate and plate, formed mechanical interlocked; After the riveting completion, cut off direct current, compound punch 1 is return initial station with blank holder 2, and annular Electroplastic does not have rivet to be accomplished.
Present embodiment is identical with other embodiments of embodiment 1.
The foregoing description is through applying electric current to it on the material deformation direction in the self-piercing riveting process; Make material more be prone to take place plastic deformation; Increase the ductility of fragility alloy in lightweight material, reduced the rivet force when riveting advanced high-strength steel, solved the phenomenon that occurs crackle at the rivet shank; Reduced production cost, the quality of connection of joint when having improved the riveted joint high-strength steel.
Claims (10)
1. an annular Electroplastic does not have the rivet device; It is characterized in that, comprising: compound punch, blank holder, annular brush and die, wherein: blank holder, workpiece and die from top to bottom are provided with successively; Compound punch is socketed in the blank holder, the coaxial setting of compound punch, blank holder and die;
Said compound punch is made up of with impacting to overlap conducting rod;
The structure that described die is connected for two cylinder tables up and down, the cylinder table diameter is less than descending cylinder table it on;
Described annular brush is connected through screw thread with last cylinder table cartridge outer surface; It is concordant with the upper surface of last cylinder table that annular electro brushes the surface; Annular brush diameter is greater than following cylinder table diameter, and the part of cylinder table diameter was along circumferentially evenly being furnished with multiple conducting wires under its lower surface exceeded.
2. annular Electroplastic according to claim 1 does not have the rivet device, it is characterized in that, the last cylinder table center of described die is provided with rounding frustum cavity, is provided with circular arc chamfering around this cavity.
3. annular Electroplastic according to claim 2 does not have the rivet device, it is characterized in that, the bottom centre of described die cavity is provided with cylindrical protrusions, and the center line of this protruding center line and compound punch is consistent.
4. annular Electroplastic according to claim 3 does not have the rivet device, it is characterized in that, described cylindrical protrusions diameter is less than the diameter of die center counterbore, and being provided with the cross section between two diameters is semicircular annular groove.
5. annular Electroplastic according to claim 1 does not have the rivet device, it is characterized in that, described compound punch is made up of with impacting to overlap conducting rod, and both connect through screw thread.
6. annular Electroplastic according to claim 5 does not have the rivet device; It is characterized in that; The head of described conducting rod is to have the structure that the two rounding frustums up and down of identical cone angle are connected; The big footpath of last rounding frustum equals conducting rod body of rod parallel-segment diameter, and the big footpath of following rounding frustum is less than the path of last rounding frustum.
7. annular Electroplastic according to claim 6 does not have the rivet device, it is characterized in that, described rounding frustum side down is provided with screw thread.
8. annular Electroplastic according to claim 6 does not have the rivet device, it is characterized in that, described impact cover is the hollow cone tubular, and the inside and outside wall cone angle of awl tube is all identical with conducting rod head rounding frustum cone angle.
9. annular Electroplastic according to claim 6 does not have the rivet device, it is characterized in that, the inwall of described impact cover is provided with screw thread and is threaded with following rounding frustum, and conducting rod head protrusion impacted the cover lower surface when assembling was accomplished.
10. annular Electroplastic according to claim 1 does not have the rivet device, it is characterized in that, the outward flange of the bottom of described blank holder is provided with annular boss.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010288778A CN101934339B (en) | 2010-09-21 | 2010-09-21 | Ring-shaped electro-plastic rivet-free riveting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010288778A CN101934339B (en) | 2010-09-21 | 2010-09-21 | Ring-shaped electro-plastic rivet-free riveting device |
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| Publication Number | Publication Date |
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| CN101934339A CN101934339A (en) | 2011-01-05 |
| CN101934339B true CN101934339B (en) | 2012-10-17 |
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| CN201010288778A Expired - Fee Related CN101934339B (en) | 2010-09-21 | 2010-09-21 | Ring-shaped electro-plastic rivet-free riveting device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113020457A (en) * | 2021-03-08 | 2021-06-25 | 吉林大学 | Rivet-free riveting forming device and riveting method based on hydraulic forming and temperature control forming |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102489853A (en) * | 2011-11-18 | 2012-06-13 | 上海交通大学 | Rivet-free resistance rivet welding connection device and rivet-free resistance rivet welding connection method |
| CN102581150B (en) * | 2012-02-23 | 2014-01-15 | 西安交通大学 | Aluminum alloy controllable explosion rivet-free connection device for automobile, and connection method for rivet-free connection device |
| CN104438889B (en) * | 2014-10-24 | 2017-01-18 | 安徽启光能源科技研究院有限公司 | Automatic rivet disengaging device for rivetless riveting device and rivet disengaging method thereof |
| CN105618656B (en) * | 2015-12-10 | 2017-10-13 | 贵州红林机械有限公司 | One kind combination stamping riveting method and its device |
| CN105689624A (en) * | 2016-02-02 | 2016-06-22 | 天津大学 | Electroplastic friction spin-riveting device and method for semi-hollow rivet |
| CN105728575B (en) * | 2016-03-01 | 2018-07-03 | 西安交通大学 | The flat no riveting plastic joining technique of the compound multiple degrees of freedom of double punches of aluminium alloy sheet |
| CN107671185B (en) * | 2017-09-30 | 2020-07-03 | 西安石油大学 | Self-resistance heating flat-bottom rivet-free connection forming device and process for lightweight plate |
| CN109821992B (en) * | 2019-04-11 | 2024-04-16 | 吉林大学 | Rivet-free riveting forming device under ultrasonic wave and high temperature effects and control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101094736A (en) * | 2004-11-08 | 2007-12-26 | 福尔肯布里奇有限公司 | Clinching tool, die and method for use thereof |
| CA2675307A1 (en) * | 2007-02-13 | 2008-08-21 | Inventio Ag | Method and tool for clinching thick sheet metal, and use of the tool |
| CN101817142A (en) * | 2010-05-20 | 2010-09-01 | 上海交通大学 | Self-piercing frictional rivet welding connecting device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2780967B2 (en) * | 1996-08-29 | 1998-07-30 | ナショナル住宅産業株式会社 | Work coupling device |
| JP2001321857A (en) * | 2000-05-11 | 2001-11-20 | Toyota Motor Corp | Plate caulking structure |
| NZ578769A (en) * | 2007-02-13 | 2012-06-29 | Inventio Ag | Load-bearing stuctural steel connection formed by clinching workpieces using conical die |
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2010
- 2010-09-21 CN CN201010288778A patent/CN101934339B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101094736A (en) * | 2004-11-08 | 2007-12-26 | 福尔肯布里奇有限公司 | Clinching tool, die and method for use thereof |
| CA2675307A1 (en) * | 2007-02-13 | 2008-08-21 | Inventio Ag | Method and tool for clinching thick sheet metal, and use of the tool |
| CN101610859A (en) * | 2007-02-13 | 2009-12-23 | 因温特奥股份公司 | The using method that is used for the Method and kit for and this instrument of clinching thick sheet metal |
| CN101817142A (en) * | 2010-05-20 | 2010-09-01 | 上海交通大学 | Self-piercing frictional rivet welding connecting device |
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| JP平10-71436A 1998.03.17 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113020457A (en) * | 2021-03-08 | 2021-06-25 | 吉林大学 | Rivet-free riveting forming device and riveting method based on hydraulic forming and temperature control forming |
| CN113020457B (en) * | 2021-03-08 | 2021-11-26 | 吉林大学 | Rivet-free riveting forming device and riveting method based on hydraulic forming and temperature control forming |
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| CN101934339A (en) | 2011-01-05 |
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