CN108906961A - One kind passing through the swollen type of internal pressure and reversed drawing forming method and device - Google Patents
One kind passing through the swollen type of internal pressure and reversed drawing forming method and device Download PDFInfo
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- CN108906961A CN108906961A CN201810688336.XA CN201810688336A CN108906961A CN 108906961 A CN108906961 A CN 108906961A CN 201810688336 A CN201810688336 A CN 201810688336A CN 108906961 A CN108906961 A CN 108906961A
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000005540 biological transmission Effects 0.000 claims abstract description 11
- 238000000465 moulding Methods 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 abstract description 6
- 238000007711 solidification Methods 0.000 abstract description 6
- 230000008023 solidification Effects 0.000 abstract description 6
- 238000009434 installation Methods 0.000 abstract description 3
- 238000005242 forging Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
-
- 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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/04—Movable or exchangeable mountings for tools
-
- 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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention discloses a kind of swollen types of internal pressure and reversed drawing and forming device, base including built-in cavity, passing through in the same position of the opposite flank of base has axis, each axle position is respectively connected with rack in one end in base, a upper mold is connected between two racks jointly, a lower mold is connected between two racks jointly, upper mold, lower die tip open up a hole respectively, upper mold, lower mold difference through hole connect same fluidised form pressure medium transmission system, and fluidised form pressure medium transmission system connects pressure pump；In the process, blank is just to have cast out the blank come, and internal material also not solidification completely does not need to heat to blank again, saves energy；Different molds is installed in selection according to different needs, and installation is rapid；The device of the invention also has the advantages that structure is simple, easy to use, a kind of, blank deformation uniform force, easy molding low to the pressure requirements of equipment by the swollen type of internal pressure and reversed drawing forming method of the invention.
Description
Technical field
The invention belongs to plastic forming equipment technical fields, and in particular to a kind of swollen type of internal pressure and reversed drawing and forming dress
It sets, further relates to a kind of by the swollen type of internal pressure and reversed drawing forming method.
Background technique
Pressure vessel is the important equipment in the industries such as petroleum, chemical industry, the energy, with the development of the social economy in China,
The pressure vessel of the industries such as nuclear power, coal chemical industry, oil refining, petrochemical industry, military project shows the development trend of enlargement, especially big straight
The appearance of diameter, the hydrogenator of big wall thickness, reactor, nuclear reactor shell etc., large-sized end enclosure also just come into being.
In order to guarantee equipment long-term high-efficiency operation at high temperature under high pressure, the pressure vessel size of use is increasing, the requirement to performance
Also higher and higher.Traditional seal head molding method has solid forging shaping method, and this method is to large-sized forging equipment and technique
There is high requirement；Impact forming method, it is easy to appear phenomena such as scratch draws trace large area to play packet；Rotary press modelling method,
It has the advantages that required equipment tonnage is small, processing cost is low, technique is flexible, molding range is wide but it easily causes slab unstability
Corrugation, it is difficult to meet the manufacture requirement of large thick-wall end socket；Divide valve Combination Welding forming method, it can use the pressure of smaller tonnage
Power machine shapes the end socket of larger size, but there are the design of end socket fragment, calculating and blanking complexity, process route length, weld seam matter
The disadvantages of amount is difficult to ensure, needs bulk heat treatmet；Explosion formation method, its feature be do not need complicated large scale equipment and
Complicated mold, but disadvantage is exactly that risk is big, it is molding in irregular shape.
Summary of the invention
The purpose of the present invention is to provide a kind of swollen types of internal pressure and reversed drawing and forming device, can make blank deformation process
Middle receiving uniform pressure load.
The purpose of the present invention is to provide one kind to pass through the swollen type of internal pressure and reversed drawing forming method.
The technical solution adopted by the present invention is a kind of swollen type of internal pressure and reversed drawing and forming device, including built-in cavity
Base, interior pass through of the same position of the opposite flank of base have axis, and each axle position connects driving mechanism in one end outside base, often
A axis other end connects organic frame by pin, connects a upper mold between two racks jointly, is total between two racks
With one lower mold of connection, upper mold, lower die tip open up a hole, upper mold, the difference through hole connection of lower mold respectively
Same fluidised form pressure medium transmission system, fluidised form pressure medium transmission system connect pressure pump.
Fluidised form pressure medium transmission system includes upper flexible duct, be provided on upper flexible duct upper valve, on let out valve, on
Flexible duct one end passes through hole and is connected on upper mold by fast inserting structure, and the upper flexible duct other end connects main pipeline, main pipeline
It is also connected with lower flexible duct one end, letdown valve, the next valve are provided on lower flexible duct, the lower flexible duct other end is logical across hole
Too fast inserting structure connects on lower mold.
Bearing is provided between each axis and base.
It is that upper mold, lower mold are connected by fast inserting structure between two racks.
Upper mold, lower mold shape selected according to actual needs.
Another technical solution of the invention is：One kind is by the swollen type of internal pressure and reversed drawing forming method, using in one kind
Swollen type and reversed drawing and forming device are pressed, the specific method is as follows：
Step 1 selects lower mold, upper mold, blank is fixed in the rack between upper mold, lower mold, and blank
It is respectively formed closed cavity with lower mold, upper mold, lower mold, upper mold are connected between two racks；
Step 2 closes upper valve, letdown valve, opens the next valve, is passed through fluidised form medium into main pipeline, fluidised form medium by
Lower flexible duct enters the lower chamber that blank and lower mold are formed, and pressure constantly increases in lower chamber, finally becomes blank
Shape is then turned off the next valve until being bonded with upper mold inner wall, opens letdown valve, carries out pressure release to lower chamber；
Step 3, close the next valve, on let out valve, open upper valve, be passed through fluidised form medium into main pipeline, fluidised form medium by
Upper flexible duct enters the upper cavity that blank and upper mold are formed, and pressure constantly increases in upper cavity, finally makes second of blank
It deforms, until being bonded with lower mould inner wall, is then turned off upper valve, lets out valve in opening, pressure release is carried out to upper cavity；
Step 4, replacement upper mold, lower mold, repeat step 1-3, just realize the moulding to blank.
Step 4 replacement upper mold, lower mold detailed process are：Rack is rotated 180 ° to horizontal position, is replaced with
Mold, lower mold.
Blank described in step 1 is in incomplete curdled appearance.
The beneficial effects of the invention are as follows：Plasticity is carried out to blank using a kind of this swollen type of internal pressure and reversed drawing and forming device
Forming, in the process, blank are just to have cast out the blank come, and internal material also not solidification completely does not need again to hair
Base heating, saves energy；Different molds is installed in selection according to different needs, and installation is rapid；The device of the invention also has
Simple, the easy to use advantage of structure, of the invention a kind of have by the swollen type of internal pressure and reversed drawing forming method to equipment
Pressure requirements are low, blank deformation uniform force, are easy the advantages of molding.
Detailed description of the invention
Fig. 1 is a kind of swollen type of internal pressure of the invention and reversed drawing and forming apparatus structure schematic diagram.
In figure, 1. lower molds, 2. bases, 3. letdown valves, 4. the next valves, 5. main pipelines, 6. pins, 7. upper valves, on 8.
Let out valve, flexible duct on 9., 10. lower flexible ducts, 11. upper molds, 12. racks, 13. bearings, 14. axis.
Specific embodiment
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
A kind of swollen type of internal pressure of the invention and reversed drawing and forming device, as shown in Figure 1, including the base 2 of built-in cavity, machine
Passing through in the same position of the opposite flank of seat 2 has axis 14, and each axis 14 is located at the connection of one end outside base 2 driving mechanism, often
A 14 other end of axis passes through pin 6 and connects organic frame 12, so that axis 14 is able to drive rack 12 and rotates together, two racks 12 it
Between connect a upper mold 11 jointly, a lower mold 1, upper mold 11,1 top of lower mold are connected between two racks 12 jointly
A hole is opened up respectively, and upper mold 11, lower mold 1 distinguish through hole and connect same fluidised form pressure medium transmission system, and fluidised form is situated between
Matter pressure transmission system connects pressure pump.
Fluidised form pressure medium transmission system includes upper flexible duct 9, be provided on upper flexible duct 9 upper valve 7, on let out valve
8, upper 9 one end of flexible duct passes through hole and is connected on upper mold 11 by fast inserting structure, and upper 9 other end of flexible duct connects main pipeline
5, main pipeline 5 is also connected with lower 10 one end of flexible duct, and letdown valve 3, the next valve 4, lower flexible pipe are provided on lower flexible duct 10
10 other end of road passes through hole and is connected on lower mold 1 by fast inserting structure.
It is provided with bearing 13 between each axis 14 and base 2, when axis 14 rotates under driving mechanism drive, 2 energy of base
Enough it remain stationary.
It is that upper mold 11, lower mold 1 are connected by fast inserting structure between two racks 12, makes upper mold 11, lower mold 1
Disassembly is more convenient.
Upper mold 11, lower mold 1 shape selected according to actual needs.
Blank is just to have cast out the blank come, internal material also not solidification completely.
One kind is filled by the swollen type of internal pressure and reversed drawing forming method using a kind of swollen type of internal pressure and reversed drawing and forming
It sets, the specific method is as follows：
Step 1 selects lower mold 1, upper mold 11, the rack 2 blank 15 being fixed between upper mold 11, lower mold 1
On, and blank 15 and lower mold 1, upper mold 11 are respectively formed closed cavity, and lower mold 1, upper mold 11 are connected to two racks
Between 12；
Blank 15 is just to have cast out the blank come, internal material also not solidification completely；
Step 2 closes upper valve 7, letdown valve 3, opens the next valve 4, and fluidised form medium is passed through into main pipeline 5, and fluidised form is situated between
Matter is entered the lower chamber that blank 15 and lower mold 1 are formed by lower flexible duct 10, and pressure constantly increases in lower chamber, finally makes hair
Base 15 deforms, until being bonded with 11 inner wall of upper mold, is then turned off the next valve 4, opens letdown valve 3, carries out to lower chamber
Pressure release；
Step 3, close the next valve 4, on let out valve 8, open upper valve 7, fluidised form medium be passed through into main pipeline 5, fluidised form is situated between
Matter is entered the upper cavity that blank 15 and upper mold 11 are formed by upper flexible duct 9, and pressure constantly increases in upper cavity, finally makes hair
It deforms for second of base 15, until being bonded with lower 1 inner wall of mold, is then turned off upper valve 7, valve 8 is let out in opening, to upper cavity
Carry out pressure release；
Step 4, replacement upper mold 11, lower mold 1, repeat step 1-3, are just able to achieve the moulding to blank 15.
Step 4 replacement upper mold 11,1 detailed process of lower mold are：Rack 12 is rotated 180 ° to horizontal position, is carried out more
Change mold 11, lower mold 1.
Upper mold 11, lower mold 1 shape selected according to actual needs.
The effect of each component is as follows in a kind of swollen type of internal pressure of the invention and reversed drawing and forming device：
Lower mold 1, upper mold 11：It can play the role of fixed, constraint to blank 15.
Base 2：Supporting body in apparatus of the present invention.
Letdown valve 3：Play the role of pressure release to hydraulic in lower flexible duct 10.
The next valve 4, upper valve 7：Control the flow direction of fluidised form medium in main pipeline 5.
Upper mold 11, lower mold 1 can be there are many shapes, such as U-shaped, rectangle, triangle, specifically can be according to seeking to be selected
It is fixed.
The application method of a kind of swollen type of internal pressure of the invention and reversed drawing and forming device is as follows：
In use, selecting lower mold 1, upper mold 11, the rack 2 blank 15 being fixed between upper mold 11, lower mold 1
On, blank 15 is just to have cast out the blank come, internal material also not solidification completely, and blank 15 and lower mold 1, upper mold 11
Closed cavity can be formed, lower mold 1, upper mold 11 are connected between two racks 12 by fast inserting structure, is closed upper
Valve 7, letdown valve 3 open the next valve 4, and fluidised form medium is passed through into main pipeline 5, and fluidised form medium enters hair by lower flexible duct 10
The lower chamber that base 15 and lower mold 1 are formed, pressure constantly increases in lower chamber, so that blank 15 is deformed, until with upper
The fitting of 11 inner wall of mold, is then turned off the next valve 4, opens letdown valve 3, carries out pressure release to lower chamber；Be then turned off the next valve 4,
On let out valve 8, open upper valve 7, be passed through fluidised form medium into main pipeline 5, fluidised form medium by upper flexible duct 9 enter blank 15 with
The upper cavity that upper mold 11 is formed, pressure constantly increases in upper cavity, finally makes to deform for second of blank 15, until under
The fitting of 1 inner wall of mold, is then turned off upper valve 7, lets out valve 8 in opening, carries out pressure release to upper cavity；And so on, it is just able to achieve
Moulding to blank 15.
Rack 12 is rotated 180 ° to horizontal position, replacement upper mold 11, lower mold 1 is carried out, blank 15 is carried out at this
Plastic forming.
By the above-mentioned means, a kind of swollen type of internal pressure of the invention and reversed drawing and forming device, to blank plastic forming process
In, blank is just to have cast out the blank come, and internal material also not solidification completely does not need to heat to blank again, saves energy
Amount；Different molds is installed in selection according to different needs, and installation is rapid；The device of the invention also have structure it is simple, to setting
Standby pressure requirements are low, blank deformation uniform force, are easy the advantages of molding；Manufacturing process of the invention is easy to operate, easily-controllable
System.
Claims (8)
1. a kind of swollen type of internal pressure and reversed drawing and forming device, which is characterized in that the base (2) including built-in cavity, the machine
Passing through in the same position of the opposite flank of seat (2) has axis (14), and each axis (14) is located at one end connection of base (2) outside
Driving mechanism, each axis (14) other end passes through pin (6) and connects organic frame (12), between two racks (12)
A upper mold (11) is connected jointly, connects a lower mold (1), the upper mold jointly between two racks (12)
(11), lower mold (1) top opens up a hole respectively, and through hole connects same flow respectively for the upper mold (11), lower mold (1)
State pressure medium transmission system, fluidised form pressure medium transmission system connect pressure pump.
2. a kind of swollen type of internal pressure as described in claim 1 and reversed drawing and forming device, which is characterized in that the fluidised form medium pressure
Power transmission system includes upper flexible duct (9), be provided on upper flexible duct (9) upper valve (7), on let out valve (8), it is described soft
Property pipeline (9) one end pass through hole by fast inserting structure connection upper mold (11), upper flexible duct (9) other end connection master
Pipeline (5), the main pipeline (5) are also connected with lower flexible duct (10) one end, are provided with letdown valve on lower flexible duct (10)
(3), the next valve (4), lower flexible duct (10) other end pass through hole and are connected on lower mold (1) by fast inserting structure.
3. a kind of swollen type of internal pressure as described in claim 1 and reversed drawing and forming device, which is characterized in that each axis (14)
Bearing (13) are provided between base (2).
4. a kind of swollen type of internal pressure as described in claim 1 and reversed drawing and forming device, which is characterized in that two racks
It (12) is that upper mold (11), lower mold (1) are connected by fast inserting structure between.
5. a kind of swollen type of internal pressure as described in claim 1 and reversed drawing and forming device, which is characterized in that the upper mold
(11), the shape of lower mold (1) is selected according to actual needs.
6. one kind passes through the swollen type of internal pressure and reversed drawing forming method, which is characterized in that using as claimed in claim 2 a kind of
Type that internal pressure is swollen and reversed drawing and forming device, the specific method is as follows：
Step 1 selects lower mold (1), upper mold (11), and blank (15) is fixed between upper mold (11), lower mold (1)
In rack (2), and blank (15) and lower mold (1), upper mold (11) are respectively formed closed cavity, and lower mold 1, upper mold 11 are connected
It is connected between two racks 12；
Step 2 closes upper valve (7), letdown valve (3), opens the next valve (4), fluidised form medium is passed through in main pipeline (5), flow
State medium is entered the lower chamber that blank (15) are formed with lower mold (1) by lower flexible duct 10, and pressure constantly increases in lower chamber,
Finally blank (15) is made to deform, until being bonded with upper mold (11) inner wall, be then turned off the next valve (4), opens letdown valve
(3), pressure release is carried out to lower chamber；
Step 3, close the next valve (4), on let out valve (8), open upper valve (7), fluidised form medium be passed through in main pipeline (5), flow
State medium is entered the upper cavity that blank (15) and upper mold (11) are formed by upper flexible duct (9), and pressure constantly increases in upper cavity
Greatly, so that blank (15) is deformed for the second time, until being bonded with lower mold (1) inner wall, be then turned off upper valve (7), beat
It opens and lets out valve (8), pressure release is carried out to upper cavity；
Step 4, replacement upper mold (11), lower mold (1), repeat step 1-3, just realize the moulding to blank (15).
7. a kind of as claimed in claim 6 pass through the swollen type of internal pressure and reversed drawing forming method, which is characterized in that described in step 4
Replacement upper mold (11), lower mold (1) detailed process are：Rack (12) are rotated 180 ° to horizontal position, carry out replacement upper mold
Have (11), lower mold (1).
8. a kind of as claimed in claim 6 pass through the swollen type of internal pressure and reversed drawing forming method, which is characterized in that described in step 1
Blank (15) is in incomplete curdled appearance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810688336.XA CN108906961B (en) | 2018-06-28 | 2018-06-28 | Forming method and device through internal pressure expansion and reverse drawing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810688336.XA CN108906961B (en) | 2018-06-28 | 2018-06-28 | Forming method and device through internal pressure expansion and reverse drawing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108906961A true CN108906961A (en) | 2018-11-30 |
| CN108906961B CN108906961B (en) | 2020-01-10 |
Family
ID=64421977
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810688336.XA Active CN108906961B (en) | 2018-06-28 | 2018-06-28 | Forming method and device through internal pressure expansion and reverse drawing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108906961B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112756473A (en) * | 2020-12-17 | 2021-05-07 | 重庆虎溪电机工业有限责任公司 | Method for making copper thin-wall skeleton |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1148673A1 (en) * | 1982-11-03 | 1985-04-07 | Московский авиационный технологический институт им.К.Э.Циолковского | Apparatus for reversing pneumatic thermal moulding of sheet bars |
| CN101507998A (en) * | 2008-02-14 | 2009-08-19 | 福特全球技术公司 | Method and apparatus for superplastic forming |
| CN102615505A (en) * | 2012-04-11 | 2012-08-01 | 陕西科技大学 | Method and device for pneumatic bulging after head casting |
| CN204263415U (en) * | 2014-12-03 | 2015-04-15 | 嘉兴鸿利机械有限公司 | Die turnover apparatus |
| CN204620799U (en) * | 2015-05-25 | 2015-09-09 | 北京机电研究所 | A kind of adjustable positive and negative inflation shape test mould |
| CN106378375A (en) * | 2016-08-30 | 2017-02-08 | 兰州空间技术物理研究所 | Hydraulic forming device of molybdenum grid for iron thruster |
-
2018
- 2018-06-28 CN CN201810688336.XA patent/CN108906961B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1148673A1 (en) * | 1982-11-03 | 1985-04-07 | Московский авиационный технологический институт им.К.Э.Циолковского | Apparatus for reversing pneumatic thermal moulding of sheet bars |
| CN101507998A (en) * | 2008-02-14 | 2009-08-19 | 福特全球技术公司 | Method and apparatus for superplastic forming |
| CN102615505A (en) * | 2012-04-11 | 2012-08-01 | 陕西科技大学 | Method and device for pneumatic bulging after head casting |
| CN204263415U (en) * | 2014-12-03 | 2015-04-15 | 嘉兴鸿利机械有限公司 | Die turnover apparatus |
| CN204620799U (en) * | 2015-05-25 | 2015-09-09 | 北京机电研究所 | A kind of adjustable positive and negative inflation shape test mould |
| CN106378375A (en) * | 2016-08-30 | 2017-02-08 | 兰州空间技术物理研究所 | Hydraulic forming device of molybdenum grid for iron thruster |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112756473A (en) * | 2020-12-17 | 2021-05-07 | 重庆虎溪电机工业有限责任公司 | Method for making copper thin-wall skeleton |
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| Publication number | Publication date |
|---|---|
| CN108906961B (en) | 2020-01-10 |
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Effective date of registration: 20240607 Address after: No. 61, Quanshuitou Village, Yanqi Town, Huairou District, Beijing, 101400 Patentee after: Cai Jinghao Country or region after: China Patentee after: Wu Shuguang Address before: 710021 Shaanxi city of Xi'an province Weiyang University Park Patentee before: SHAANXI University OF SCIENCE & TECHNOLOGY Country or region before: China |