CN109465321A - A kind of manufacturing method of the inside reinforcing rib cylinder of band - Google Patents
A kind of manufacturing method of the inside reinforcing rib cylinder of band Download PDFInfo
- Publication number
- CN109465321A CN109465321A CN201811456677.0A CN201811456677A CN109465321A CN 109465321 A CN109465321 A CN 109465321A CN 201811456677 A CN201811456677 A CN 201811456677A CN 109465321 A CN109465321 A CN 109465321A
- Authority
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- China
- Prior art keywords
- cylinder
- blank
- reinforcing rib
- core model
- spinning roller
- 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
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 238000009987 spinning Methods 0.000 claims abstract description 36
- 230000004323 axial length Effects 0.000 claims abstract description 7
- 238000001125 extrusion Methods 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims description 14
- 210000003205 muscle Anatomy 0.000 claims description 12
- 230000033001 locomotion Effects 0.000 claims description 7
- 239000003610 charcoal Substances 0.000 claims description 4
- 230000006978 adaptation Effects 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910002804 graphite Inorganic materials 0.000 claims description 2
- 239000010439 graphite Substances 0.000 claims description 2
- 230000007812 deficiency Effects 0.000 abstract description 2
- 230000000903 blocking effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 10
- 229910001069 Ti alloy Inorganic materials 0.000 description 5
- 238000005242 forging Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000835 fiber Substances 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 230000002929 anti-fatigue Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
- 210000001519 tissue Anatomy 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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/14—Spinning
- B21D22/16—Spinning over shaping mandrels or formers
-
- 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
- B21D51/00—Making hollow objects
- B21D51/02—Making hollow objects characterised by the structure of the objects
- B21D51/10—Making hollow objects characterised by the structure of the objects conically or cylindrically shaped objects
Abstract
For overcome the deficiencies in the prior art, it is high that the present invention provides a kind of stock utilization, high production efficiency, the manufacturing method of the inside reinforcing rib cylinder of the band of good product quality, green part is sleeved on core model end, driving spindle rotates and drives core model, limiting device, blank rotation, under the blocking of limiting device and the axial impetus on tail top, the axial length of blank shortens, radial thickness increases, then control spinning roller relative at the port of blank rear end radially adjacent to and extrusion billet end wall, in the position-limiting action of core model end annular recess, under the thrust on tail top, the port of blank rear end radially thickens filling with spinning roller radial feed and forms reinforcing rib in radially inwardly projecting circumferential direction, control spinning roller is moved axially relative to first cylinder, when spinning roller is close to when making the wall thickness of cylinder reach preset value, spinning roller stops Radially adjacent to and keep move axially so that cylinder uniform wall thickness, to obtain the cylinder of the inside reinforcing rib of band.
Description
Technical field
The invention belongs to accurate Technology of Plastic Processing fields, and in particular to a kind of manufacturer of the inside reinforcing rib cylinder of band
Method.
Background technique
Titanium alloy as a kind of valuable source metal, price costly, have that specific strength is high, use temperature range is wide (-
269~600 DEG C), corrosion stability, nonmagnetic, low resistance and the characteristics such as high temperature performance is good, can satisfy Aeronautics and Astronautics, weapons etc.
The structure lightened demand of parts of thin-wall casing, with national economy sustained and rapid development, the Chinese demand to titanium alloy is more
It is to be increased with annual 20%~30% speed.
Currently, band inside muscle titanium alloy thin wall cylinder manufacturing method in one end is mainly " forging integrated machine adds " and " circumferential direction
Interior muscle section integrated machine adds+thin wall cylinder section spinning " two methods, it is insufficient as follows that there are techniques: 1. utilize " forging integrated machine adds " side
Method obtains the main technique disadvantage of the inside muscle titanium alloy thin wall cylinder part of one end band are as follows: (a) a large amount of titanium quilt when processing
It empties, stock utilization is low；(b) for thin wall tubular body part, whole mechanical processing technique difficulty is larger, and Product Precision is not easy to protect
Card, process-cycle are also longer；(c) material fiber streamline is cut off, and antifatigue impact property is weaker.2. utilize " circumferential direction in muscle section
Integrated machine adds+thin wall cylinder section spinning " method obtains the main technique disadvantage of the inside muscle titanium alloy thin wall cylinder part of one end band
Are as follows: (a) " although thin wall cylinder section spinning " can be realized the saving to forging length, due to the presence of muscle in circumferential direction, Wu Fashi
Now to the saving of forging thickness, when processing, still has more titanium to be emptied, and stock utilization is relatively low；(b) added by machine
Muscle section in the circumferential direction of acquisition, material fiber streamline are cut off, itself is not strengthened by spinning, and antifatigue impact property is weaker.
Summary of the invention
Based on problem above, that it is an object of the invention to overcome the deficiencies of the prior art and provide a kind of stock utilizations is high,
High production efficiency, good product quality the inside reinforcing rib cylinder of band manufacturing method.
In order to achieve the goal above, the technical solution adopted by the present invention are as follows: a kind of manufacture of the inside reinforcing rib cylinder of band
A kind of manufacturing method of the inside reinforcing rib cylinder of band of method, comprising the following steps:
Limiting device is socketed and is fixed on the core model connecting with main shaft by step 1, the setting of core model end and cylinder to be manufactured
The annular recess of muscle shape adaptation in reinforcement on body, it is 500~550 that core model is preheated to and kept the temperature of the core model
℃；
Green part is sleeved on core model end by step 2, and tail top is arranged in blank rear end, and spinning roller is arranged in stock side,
Spinning roller can be relative to blank axial direction or radial feed；
Step 3, driving spindle rotate and drive core model, limiting device, blank rotation, heat blank and protect blank temperature
It holds within the scope of 630~680 DEG C, pushes tail top relative to core model axially adjacent to the axial length of blank shortens, and radial thickness increases
Add, then control spinning roller is relative to radial feed at the port of blank rear end and extrusion billet, the annular recess in core model end
Position-limiting action, tail top thrust under, the port of blank rear end radially thickens filling with spinning roller radial feed and is formed
Reinforcing rib in radially inwardly projecting circumferential direction, to obtain the first cylinder of the inside reinforcing rib of band；
Step 4, control limiting device move along mold core and far from first cylinders, and control spinning roller is axially moved relative to first cylinder
Dynamic, first cylinder flows while rotating with core model along the outer wall of core model, and the axial length of first cylinder becomes larger, and radial thickness subtracts
It is small；When spinning roller is close to when making the wall thickness of first cylinder reach preset value, spinning roller stop radially adjacent to and keep moving axially so that
The uniform wall thickness of first cylinder, to obtain the cylinder of the inside reinforcing rib of band.
Specifically, blank is tubing, general diameter existsWall thickness in 6~12mm, length 200~
1000mm, internal diameter and core model outer diameter are reserved with can be with freely fitted gap, usually 0.20mm~0.30mm；Tail top is by equipment
Oil cylinder driving, can provide the permanent pressure of 6t~10t；Spinning roller is mounted on equipment spinning roller axis, can be around spinning roller axis with main shaft
Make driven rotary motion, radially, axially feed motion can also be made with spinning roller axis, is mainly axial feed motion in the present invention,
Usual feed speed is 100~300mm/min.
Optimization, it the defects of causing core model outer surface to aoxidize in order to avoid flame heating time is too long, adopts in the step 1
Core model is preheated with mid-frequency induction heating coil.
Optimization, hollow lumen is set inside step 1 core mould, by filled in hollow lumen heat medium with
Keeping die temperature is 500~550 DEG C；The heat medium preferably burns red charcoal.
Specifically, blank is heated using flame heating blowpipe in the step 2 and make blank temperature be maintained at 630~
Within the scope of 680 DEG C, heavy caliber flame heating blowpipe can be used, the uniformity of heating is improved, in step 1 in each 2~3 of equipment two sides
On the basis of, green body and core model can be heated to 630~680 DEG C in a short time；In entire manufacturing process, blank outer surface is begun
Flame torch concurrent heating is taken eventually, is burnt in conjunction with red charcoal heating and thermal insulation with the hollow lumen filling in above-mentioned optimal way in core model, shape
At isothermal spinning condition, blank surfaces externally and internally temperature gradient is effectively reduced, the alloy plasticity of blank is improved.
Graphite is coated to prevent blank from aoxidizing in blank surface before heating blank in the step 3.
The limiting device is annular dish, and further, limiting device is fixed or moved by servo-cylinder.
The beneficial effects of the present invention are:
1) stock utilization is high: the present invention is effectively saved raw material (pipe by " thickening filling+thinning growth " technology
Material) length and thickness, the Accurate Shaping of muscle section and thin wall cylinder section in circumferential direction is realized, maching dimension is needed to be only limitted to two ends
Length, machining allowance is small, and stock utilization is high.
2) high production efficiency: the present invention realizes entire part Accurate Shaping on a cnc spinning machine, without secondary
The intermediate links such as centering clamping, easy to operate, production process is greatly simplified, and processing beat is fast, high production efficiency.
3) good product quality: the product parts that the present invention obtains, material fiber streamline is continuous, by the circumferential direction for thickening filling
The thin wall cylinder section of interior muscle section and thinning growth, tissue and mechanical performance are improved, compared with traditional handicraft, product quality
It greatly improves.
Detailed description of the invention
Fig. 1 is step 2,3 schematic diagrames；
Fig. 2 is step 4 schematic diagram；
Fig. 3 is the sectional view of the inside reinforcing rib cylinder of band obtained in embodiment；
Wherein, 1 is main shaft, and 2 be core model, and 3 be limiting device, and 4 be blank, and 5 be tail top, and 6 be spinning roller, and 7 be cylinder, and 71 are
Reinforcing rib in circumferential direction.
Specific embodiment
The invention will now be described in further detail with reference to the accompanying drawings.
Embodiment
The present embodiment provides a kind of manufacturing methods of inside reinforcing rib cylinder 7 of band as shown in Figure 3, comprising the following steps:
The limiting device 3 of the ring disk shape is socketed and is fixed on the core model 2 connecting with main shaft 1 by step 1, limiting device 3 with
Servo-cylinder connection, the annular recess of the setting of 2 end of core model and muscle shape adaptation in the reinforcement on cylinder to be manufactured, by core model 2
The temperature for being preheated and being kept core model 2 is 500~550 DEG C；
Step 2, as shown in Figure 1,4 part of blank is sleeved on 2 end of core model, in 4 rear end of blank, tail top 5, tail top 5 are set
It is connect with oil cylinder and spinning roller 6 can be set in 4 side of blank, spinning roller 6 is pacified under the driving of oil cylinder close to or far from 4 rear end of blank
On equipment spinning roller axis and driven rotary motion can be made with main shaft 1 around spinning roller axis, can also made radially, axially with spinning roller axis
Feed motion；
Step 3, driving spindle 1 rotate and drive core model 2, limiting device 3, blank 4 to rotate, and coat stone on 4 surface of blank
After ink using flame heating blowpipe heat blank 4, be maintained at 4 temperature of blank within the scope of 630~680 DEG C, push tail top 5 relative to
Core model 2 is axially adjacent to the axial length of blank 4 shortens, and radial thickness increases, and then controls spinning roller 6 relative to 4 rear end of blank
Radial feed and extrusion billet 4 at port, under the position-limiting action of 2 end annular recess of core model, the thrust on tail top 5, base
Expect that the port of 4 rear ends radially thickens filling with 6 radial feed of spinning roller and forms reinforcing rib in radially inwardly projecting circumferential direction
71, to obtain the first cylinder of the inside reinforcing rib 71 of band；
Step 4, as shown in Fig. 2, control limiting device 3 along mold core axial movement and far from first cylinder by servo-cylinder,
Spinning roller 6 is controlled relative to first cylinder axial feed, first cylinder flows while rotating with core model 2 along the outer wall of core model 2, first cylinder
The axial length of body becomes larger, and radial thickness reduces to complete the manufacture of cylinder, to obtain the cylinder of the inside reinforcing rib 71 of band
7；
In the present embodiment, hollow lumen is set inside core model 2, in step 1 using mid-frequency induction heating coil to core model 2 into
Row preheating burns red charcoal as heat medium to keep 2 temperature of core model for 500~550 DEG C by filling out in hollow lumen；
In the present embodiment, blank 4 is heated and 4 temperature of blank is made to be maintained at 630 using flame heating blowpipe in step 2
Within the scope of~680 DEG C.
The above embodiment of the present invention is only example to illustrate the invention, and is not to implementation of the invention
The restriction of mode.For those of ordinary skill in the art, other can also be made not on the basis of the above description
With the variation and variation of form.Here all embodiments can not be exhaustive.It is all to belong to technical solution of the present invention
Changes and variations that derived from are still in the scope of protection of the present invention.
Claims (8)
1. a kind of manufacturing method of the inside reinforcing rib cylinder of band, which comprises the following steps:
Limiting device is socketed and is fixed on the core model connecting with main shaft by step 1, in the setting of core model end and cylinder to be manufactured
Reinforcement in muscle shape adaptation annular recess, core model is preheated and keep the core model temperature be 500~550 DEG C；
Green part is sleeved on core model end by step 2, and tail top is arranged in blank rear end, and spinning roller, spinning roller is arranged in stock side
It can be relative to blank axial direction or radial feed；
Step 3, driving spindle rotate and drive core model, limiting device, blank rotation, heat blank and are maintained at blank temperature
Within the scope of 630~680 DEG C, push tail top relative to core model axially adjacent to, the axial length of blank shortens, radial thickness increase,
Then control spinning roller is relative to radial feed at the port of blank rear end and extrusion billet, in the limit of core model end annular recess
It acts on, under the thrust on tail top, the port of blank rear end radially thickens filling with spinning roller radial feed and forms radial direction
Reinforcing rib in inwardly projecting circumferential direction, to obtain the first cylinder of the inside reinforcing rib of band；
Step 4 controls limiting device by servo-cylinder along mold core axial movement and far from first cylinder, controls spinning roller relative to first
Cylinder axial feed, first cylinder flow while rotating with core model along the outer wall of core model, and the axial length of first cylinder becomes larger, diameter
Reduce to thickness to complete the manufacture of cylinder, to obtain the cylinder of the inside reinforcing rib of band.
2. the manufacturing method of the inside reinforcing rib cylinder of band according to claim 1, which is characterized in that in the step 1
Core model is preheated using mid-frequency induction heating coil.
3. the manufacturing method of the inside reinforcing rib cylinder of band according to claim 1 or 2, which is characterized in that the step 1
Hollow lumen is set inside core mould, by filling heat medium in hollow lumen to keep die temperature for 500~550
℃。
4. the manufacturing method of the inside reinforcing rib cylinder of band according to claim 3, which is characterized in that the heat medium
To burn red charcoal.
5. the manufacturing method of the inside reinforcing rib cylinder of band according to claim 1, which is characterized in that in the step 2
Blank is heated using flame heating blowpipe and is maintained at blank temperature within the scope of 630~680 DEG C.
6. the manufacturing method of the inside reinforcing rib cylinder of band according to claim 1, which is characterized in that in the step 2
Graphite is coated in blank surface before heating blank.
7. the manufacturing method of the inside reinforcing rib cylinder of band according to claim 1, which is characterized in that the limiting device
For annual disk.
8. the manufacturing method of the inside reinforcing rib cylinder of band according to claim 1, which is characterized in that the limiting device
It is fixed or is moved by servo-cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811456677.0A CN109465321B (en) | 2018-11-30 | 2018-11-30 | Manufacturing method of cylinder with annular inner reinforcing ribs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811456677.0A CN109465321B (en) | 2018-11-30 | 2018-11-30 | Manufacturing method of cylinder with annular inner reinforcing ribs |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109465321A true CN109465321A (en) | 2019-03-15 |
| CN109465321B CN109465321B (en) | 2020-04-03 |
Family
ID=65674673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811456677.0A Active CN109465321B (en) | 2018-11-30 | 2018-11-30 | Manufacturing method of cylinder with annular inner reinforcing ribs |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109465321B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110479841A (en) * | 2019-08-02 | 2019-11-22 | 武汉理工大学 | Manufacturing process is rolled in the large-scale horizontal high multidirectional rotation of muscle thin-walled ring multi-pass |
| CN110586730A (en) * | 2019-09-17 | 2019-12-20 | 上海交通大学 | Finished product of cylindrical part with inner wall longitudinal ribs and forming method thereof |
| CN113245428A (en) * | 2021-06-21 | 2021-08-13 | 西北工业大学 | Oblique rolling type spinning forming method for cylindrical part with inner ribs |
| CN114082825A (en) * | 2021-10-28 | 2022-02-25 | 上海交通大学 | Reverse flow spinning forming device for cylindrical part with grid ribs and control method |
| CN114160652A (en) * | 2021-11-26 | 2022-03-11 | 西安泰金工业电化学技术有限公司 | Hot spinning forming method for large-diameter titanium alloy cylindrical part |
| CN114523027A (en) * | 2022-02-23 | 2022-05-24 | 西北工业大学 | Circular steering spinning forming method for spiral rib cylinder capable of eliminating annular rib filling height difference |
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| JPS5921429A (en) * | 1982-07-28 | 1984-02-03 | Nissan Motor Co Ltd | Manufacture of thin cylinder having plural step difference on inside face |
| DE3423146A1 (en) * | 1984-02-02 | 1985-08-14 | Luchaire S.A., Paris | METHOD FOR SHAPING A RING BULB AT THE BOTTOM OF A ONE-PIECE METAL CIRCULAR VESSEL AND LIKE THIS VESSEL |
| US20030046803A1 (en) * | 2001-08-10 | 2003-03-13 | Ryuichi Kaneko | Manufacturing method of cylinder |
| CN108463296A (en) * | 2016-01-14 | 2018-08-28 | 都美工业株式会社 | Spinning apparatus and spin-on process |
| CN108500108A (en) * | 2017-02-27 | 2018-09-07 | 湖北三江航天红阳机电有限公司 | Circumferential muscle cylinder spinning tool and manufacturing process in a kind of band |
-
2018
- 2018-11-30 CN CN201811456677.0A patent/CN109465321B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5921429A (en) * | 1982-07-28 | 1984-02-03 | Nissan Motor Co Ltd | Manufacture of thin cylinder having plural step difference on inside face |
| DE3423146A1 (en) * | 1984-02-02 | 1985-08-14 | Luchaire S.A., Paris | METHOD FOR SHAPING A RING BULB AT THE BOTTOM OF A ONE-PIECE METAL CIRCULAR VESSEL AND LIKE THIS VESSEL |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110479841A (en) * | 2019-08-02 | 2019-11-22 | 武汉理工大学 | Manufacturing process is rolled in the large-scale horizontal high multidirectional rotation of muscle thin-walled ring multi-pass |
| CN110479841B (en) * | 2019-08-02 | 2020-08-25 | 武汉理工大学 | Multi-pass multi-directional rotary rolling forming method for large transverse high-rib thin-wall ring piece |
| CN110586730A (en) * | 2019-09-17 | 2019-12-20 | 上海交通大学 | Finished product of cylindrical part with inner wall longitudinal ribs and forming method thereof |
| CN113245428A (en) * | 2021-06-21 | 2021-08-13 | 西北工业大学 | Oblique rolling type spinning forming method for cylindrical part with inner ribs |
| CN113245428B (en) * | 2021-06-21 | 2023-06-27 | 西北工业大学 | Inclined rolling type spinning forming method for cylindrical part with inner ribs |
| CN114082825A (en) * | 2021-10-28 | 2022-02-25 | 上海交通大学 | Reverse flow spinning forming device for cylindrical part with grid ribs and control method |
| CN114082825B (en) * | 2021-10-28 | 2022-12-30 | 上海交通大学 | Reverse flow spinning forming device for cylindrical part with grid ribs and control method |
| CN114160652A (en) * | 2021-11-26 | 2022-03-11 | 西安泰金工业电化学技术有限公司 | Hot spinning forming method for large-diameter titanium alloy cylindrical part |
| US11779986B2 (en) | 2021-11-26 | 2023-10-10 | Xi'an Taijin New Energy & Materials Sci-Tech Co., Ltd. | Hot-spinning formation method for large-diameter titanium alloy cylindrical parts |
| CN114523027A (en) * | 2022-02-23 | 2022-05-24 | 西北工业大学 | Circular steering spinning forming method for spiral rib cylinder capable of eliminating annular rib filling height difference |
| CN114523027B (en) * | 2022-02-23 | 2023-12-22 | 西北工业大学 | Circular turning spinning forming method for spiral rib cylinder capable of eliminating height difference of circumferential rib filling |
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| Publication number | Publication date |
|---|---|
| CN109465321B (en) | 2020-04-03 |
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Effective date of registration: 20240329 Address after: 610000 Chengdu 189 economic and Technological Development Zone (Longquanyi District), Sichuan. Patentee after: Chengdu Aerospace Long March Machinery Co.,Ltd. Country or region after: China Address before: 610100 Chengdu 189 economic and Technological Development Zone (Longquanyi District), Sichuan. Patentee before: SICHUAN AEROSPACE CHANGZHENG EQUIPMENT MANUFACTURING Co.,Ltd. Country or region before: China |