CN113664474A - Manufacturing process of automobile door ring - Google Patents
Manufacturing process of automobile door ring Download PDFInfo
- Publication number
- CN113664474A CN113664474A CN202111003492.6A CN202111003492A CN113664474A CN 113664474 A CN113664474 A CN 113664474A CN 202111003492 A CN202111003492 A CN 202111003492A CN 113664474 A CN113664474 A CN 113664474A
- Authority
- CN
- China
- Prior art keywords
- door ring
- welding
- heating
- ring plate
- overlapping
- 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.)
- Pending
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
- B62D25/04—Door pillars ; windshield pillars
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
- B62D25/20—Floors or bottom sub-units
- B62D25/2009—Floors or bottom sub-units in connection with other superstructure subunits
- B62D25/2036—Floors or bottom sub-units in connection with other superstructure subunits the subunits being side panels, sills or pillars
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D27/00—Connections between superstructure or understructure sub-units
- B62D27/02—Connections between superstructure or understructure sub-units rigid
Abstract
The invention relates to a manufacturing process of an automobile door ring, which comprises the following steps: welding: obtaining plates with required sizes according to the composition of the door rings, overlapping adjacent plates together up and down, wherein the overlapping width is 16-60 mm, and performing resistance spot welding or laser spot welding on the overlapping position; and (3) heat treatment: putting the welded door ring plate into a heating furnace for heating, and heating by adopting isothermal or gradient temperature rise, wherein the heating temperature range is 830-970 ℃, and the heat preservation time is 8-15 s; thermoforming: taking out the door ring plate from the heating furnace, putting the door ring plate into a thermal forming die for punch forming, and quenching at a cooling speed of more than or equal to 30 ℃/s; laser cutting: and taking the door ring plate material out of the hot forming die, and removing the redundant rim charge by laser cutting. Resistance spot welding or laser spot welding is carried out on the lap joint position, special welding wires are not needed, and the manufacturing cost is reduced; the coating on the plate is not required to be removed during welding, so that the working procedures are reduced, and the processing cost is reduced.
Description
Technical Field
The invention relates to the technical field of automobile part processing, in particular to a manufacturing process of an automobile door ring.
Background
The automobile door ring product can realize about 15% weight reduction, and simultaneously the collision performance of the automobile door ring product is improved by about 25%, so that the door ring product becomes an important product developed by automobile part enterprises. At present, the hot stamping door ring for the automobile adopts a laser tailor welding mode to weld the A column, the B column, the lower reinforcing plate of the A column and the doorsill into an integrated door ring, and then adopts a hot stamping process to manufacture a door ring product.
At present, hot stamping high-strength steel tailor-welding processes mainly comprise three types: 1. the method does not strip the high-strength steel coating, and directly adopts a welding wire adding mode to splice and weld several plates together. However, the welding wires required by the process are specially made, and the cost is very high. 2. Only removing the coating of the high-strength steel plate, reserving the transition layer, and then welding all the plate materials by adopting a laser tailor welding mode. However, the coating of the plate is very thin and is only a few micrometers, the accuracy of the current laser ablation technology is unstable, the problem that the welding quality is affected due to the incomplete coating is easily solved, or the product quality is affected due to the damage to a substrate caused by the deeper ablation depth is easily solved. Meanwhile, the process is multiple, the equipment cost is high, and the product cost is high. 3. And removing the coating and the transition layer of the high-strength steel plate, and then welding the plates together in a laser welding mode. Because the coating and the transition layer on the plate are removed before welding, the welding seam position of the process has poor corrosion resistance, and the strength of the product is easily reduced after long-time use or in a humid environment.
Disclosure of Invention
The invention provides a manufacturing process of an automobile door ring, aiming at the technical problems of tailor welding of the door ring in the prior art.
The technical scheme for solving the technical problems is as follows: a manufacturing process of an automobile door ring comprises the following steps:
welding: obtaining plates with required sizes according to the composition of the door rings, overlapping adjacent plates together up and down, wherein the overlapping width is 16-60 mm, and performing resistance spot welding or laser spot welding on the overlapping position; and (3) heat treatment: placing the welded door ring plate material into a heating furnace for heating, wherein the heating mode adopts isothermal or gradient heating, the heating temperature range is 830-970 ℃, and the heat preservation time is 8-15 s;
thermoforming: taking out the door ring plate from the heating furnace, putting the door ring plate into a thermal forming die for punch forming, and quenching at a cooling speed of more than or equal to 30 ℃/s;
laser cutting: and taking the door ring plate material out of the hot forming die, and removing the redundant rim charge by laser cutting.
The invention has the beneficial effects that: according to the invention, resistance spot welding or laser spot welding is carried out after the adjacent plates are lapped, and a special welding wire is not needed, so that the manufacturing cost is reduced; meanwhile, during welding, a coating on the plate is not required to be removed, so that the process, equipment cost and working hours are reduced, the processing cost is reduced, the welding strength and the corrosion resistance of the door ring plate are improved, and the service life of a product is ensured. By controlling the lapping width, the welding spots can be ensured to be placed at the lapping position, the welding strength is ensured, the whole weight of the door ring plate is controlled, and the use cost of raw materials is reduced. When the cooling speed is lower than 30 ℃/s, the internal structure of the plate is converted into other structures, the product performance is influenced, the internal structure of the plate can be completely converted into lath martensite by high cooling speed, the hardness of the product is increased, and the product performance is good.
On the basis of the technical scheme, in order to achieve the convenience of use and the stability of equipment, the invention can also make the following improvements on the technical scheme:
further, in the welding step, the lapping directions of two ends of the same plate are different.
The further technical scheme has the advantages that one end of each plate is placed at the lower end of the adjacent plate, the other end of each plate is placed at the upper end of the other adjacent plate, staggered lap joint is achieved, and welding strength is improved.
Furthermore, in the welding step, a plurality of welding points are formed at the lapping positions, and the nugget diameter of each welding point is 4-8 mm.
The further technical scheme has the advantages that welding points with different numbers and nugget diameters are welded at the lap joint according to different thicknesses of the plates, so that the welding strength of the plates is ensured, the welding requirements of the plates with different thicknesses are met, and the application range of the invention is widened.
Furthermore, the welding spots are arranged in a straight line or in a crossed manner.
The further technical scheme has the beneficial effects that the welding requirement of the plate with larger thickness is met, and the welding strength is improved.
Further, the plurality of welding points form at least one row.
The further technical scheme has the beneficial effects that different quantities of welding points are selected according to the thickness of the plate, so that the welding strength can be ensured, and meanwhile, the processing cost can be saved.
Further, in the thermal forming step, a water cooling machine for cooling the door ring plate is arranged in the thermal forming die, and the temperature of cooling water in the water cooling machine is 10-20 ℃.
The further technical scheme has the beneficial effects that the quenching effect on the door ring plate is ensured, and the hardness of the door ring plate is improved.
Further, in the hot forming step, after quenching, the yield strength of the door ring plate is greater than or equal to 950Mpa, the tensile strength is greater than or equal to 1350Mpa, and the elongation is greater than or equal to 5%.
The beneficial effects of adopting above-mentioned further technical scheme are that, guarantee the anti collision performance of door ring sheet material, satisfy user's operation requirement, improve the utilization ratio of sheet material.
Further, in the thermal forming step, when the temperature of the door ring plate is less than or equal to 200 ℃, the door ring plate is taken out of the thermal forming die.
The beneficial effect of adopting the further technical scheme is that: the quenching effect of the door ring plate is ensured, so that the strength of the door ring plate is ensured to meet the use requirement.
Further, after the step of thermoforming, repair welding is carried out on the lap joint position.
The beneficial effect of adopting the further technical scheme is that: the welding quality of the plate is ensured, so that the strength requirement of the door ring is met.
Drawings
FIG. 1 is a schematic view of an automobile door ring according to embodiment 1 of the present invention;
FIG. 2 is a partial side view of the welding of adjacent panels of the present invention;
FIG. 3 is a schematic view of an automobile door ring according to embodiment 2 of the present invention;
fig. 4 is a schematic view of embodiment 3 of the present invention.
The reference numbers are recorded as follows: 1. a column plate material; 2. b, column plate material; 3. a threshold plate material; 4. h column plate material; 5. and (7) welding points.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Example 1
Referring to fig. 1 and 2, a manufacturing process of an automobile door ring includes the following steps:
welding: obtaining a plate material with a required size according to the composition of a door ring, wherein the door ring comprises an A column plate material 1, a B column plate material 2, a threshold plate material 3 and an H column plate material 4, adjacent plate materials are vertically overlapped together, the overlapping width is 16-60 mm, resistance spot welding or laser spot welding is carried out on the overlapping position, and a welding spot 5 is formed at the overlapping position;
according to the thickness of the plate and the number of welding points, a proper overlapping width is selected, when the overlapping width is smaller than 16mm, the welding area of the welding point 5 is limited, the condition of insufficient welding strength is easy to occur, and the door ring has potential safety quality hazards; when the lap width is larger than 60mm, the lap width is overlarge, so that the sheet material of the door ring is heavier, the requirement of weight reduction of the automobile door ring cannot be met, and the use cost of the sheet material is increased.
The overlap width is preferably 30 mm.
The laser spot welding can complete single spot welding within 1 second, the welding efficiency is high, the phenomenon of insufficient welding can be avoided, the equipment cost is low, and the like;
and (3) heat treatment: placing the welded door ring plate material into a heating furnace for heating, wherein the heating mode adopts isothermal or gradient heating, the heating temperature range is 830-970 ℃, and the heat preservation time is 8-15 s;
thermoforming: taking out the door ring plate from the heating furnace, putting the door ring plate into a thermal forming die for punch forming, and quenching at a cooling speed of more than or equal to 30 ℃/s;
laser cutting: and taking the door ring plate material out of the hot forming die, and removing the redundant rim charge by laser cutting.
In a preferred embodiment, the door ring blank is removed from the furnace by a robot and placed on the thermoforming mold.
In a preferred embodiment, a laser cutting program is set according to the requirements of a door ring digifax, so that redundant materials on a door ring plate material are removed.
In an optional embodiment, a plurality of temperature control areas are arranged in the heating furnace, and the heating temperature is sequentially increased according to the temperature control areas, so that gradient heating is realized when the door ring plate enters different temperature control areas of the heating furnace, the tissue transformation in the door ring plate is uniform, and the yield strength and the tensile strength of the plate are improved.
In the welding step, the lapping directions of two ends of the same plate are different. The two ends of the plate are overlapped in a staggered way, so that the overall welding strength of the door ring can be improved.
Optionally, the overlapping directions of the two ends of the same plate material may also be the same.
In the welding step, a plurality of welding spots 5 are formed at the lapping positions, and the nugget diameter of each welding spot 5 is 4-8 mm. When the nugget diameter is smaller than 4mm, the welding spot is small, the welding strength of the lap joint can not be ensured, and when the nugget diameter is larger than 8mm, the welding strength is satisfied, but the welding efficiency is reduced, the welding time is increased, and the overall welding efficiency is influenced.
Specifically, when the thickness of the plate is 2.6mm, the diameter of the nugget is 5 mm; when the thickness of the plate is 3.4mm, the diameter of the nugget is 8 mm. The nugget diameters of different sizes are selected according to the thickness of the plate, so that the strength requirement of the door ring can be met, and meanwhile, the welding efficiency can be ensured.
The welding spots 5 are arranged in a straight line, and the welding spots 5 form at least one row. The welding spots are arranged in a straight line, so that the adjacent plates can be fully welded, the insufficient welding is avoided, and the appearance is attractive.
In the thermal forming step, a water cooling machine for cooling the door ring plate is arranged in the thermal forming die, and the temperature of cooling water in the water cooling machine is 10-20 ℃. A water channel is arranged in the forming die, and cooling water flows in the water channel through a water cooling machine, so that the door ring plate is cooled, and meanwhile, the cooling water can be recycled, and resource waste is avoided.
In the hot forming step, after quenching, the yield strength of the door ring plate is more than or equal to 950Mpa, the tensile strength is more than or equal to 1350Mpa, and the elongation is more than or equal to 5%.
The yield strength of the door ring plate after heat treatment is preferably 950Mpa, the tensile strength is preferably 1350Mpa-1650Mpa, and the elongation is preferably 5% -6%.
In a preferred embodiment, the yield strength of each plate of the combined door ring can be the same or different, namely, the plates can be welded by combining different materials or welded by a single material; the tensile strength of the door ring plate after heat treatment can be 500MPa, 1000MPa, 1500MPa or 2000MPa, so that the strength requirements of different automobile door rings are met, and the application range of the manufacturing process is widened.
In the thermal forming step, when the temperature of the door ring plate is less than or equal to 200 ℃, the door ring plate is taken out of the thermal forming die, and the door ring plate is fully quenched.
Preferably, after the thermoforming step, repair welding is performed on the overlapped position, and the repair welding mode can be laser spot welding or resistance spot welding. Optionally, the door ring plate is taken out of the hot forming die by a manipulator, and after natural cooling, the redundant rim charge of the door ring plate is subjected to laser cutting.
Example 2
Referring to fig. 3, the difference from embodiment 1 is the arrangement of the solder bumps, and the rest is the same as embodiment 1.
A process for manufacturing a door ring for an automobile, in which a plurality of welding points 5 are arranged to cross each other at the time of welding, thereby increasing the strength of the welding.
Example 3
Referring to fig. 4, the difference from embodiment 1 is the structure of the door ring, and the rest is the same as embodiment 1.
A process for producing an automotive door ring, which is applicable not only to the closed door ring shown in example 1 but also to the semi-closed door ring in the present example. In the embodiment, the door ring comprises an A column plate 1, a B column plate 2 and an H column plate 4, adjacent plates are overlapped up and down, laser spot welding or resistance spot welding is carried out on the overlapped position, and a plurality of welding spots 5 are formed at the overlapped position.
Alternatively, according to the actual use condition, a semi-closed door ring comprising different plate materials can be manufactured.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. The manufacturing process of the automobile door ring is characterized by comprising the following steps:
welding: obtaining plates with required sizes according to the composition of the door rings, overlapping adjacent plates together up and down, wherein the overlapping width is 16-60 mm, and performing resistance spot welding or laser spot welding on the overlapping position;
and (3) heat treatment: placing the welded door ring plate material into a heating furnace for heating, wherein the heating mode adopts isothermal heating or gradient heating, the heating temperature range is 830-970 ℃, and the heat preservation time is 8-15 s;
thermoforming: taking out the door ring plate from the heating furnace, putting the door ring plate into a thermal forming die for punch forming, and quenching at a cooling speed of more than or equal to 30 ℃/s;
laser cutting: and taking the door ring plate material out of the hot forming die, and removing the redundant rim charge by laser cutting.
2. The process for manufacturing an automobile door ring according to claim 1, wherein in the welding step, the overlapping directions of two ends of the same plate material are different.
3. The manufacturing process of the automobile door ring according to claim 1 or 2, wherein in the welding step, a plurality of welding points are formed at the overlapping positions, and the nugget diameter of the welding points is 4mm-8 mm.
4. The process of claim 3, wherein the plurality of welds are arranged in a straight line or in a cross-over arrangement.
5. The process of manufacturing an automotive door ring according to claim 4, wherein the plurality of welds are formed in at least one row.
6. The manufacturing process of the automobile door ring according to claim 1, wherein in the thermal forming step, a water cooling machine for cooling the door ring plate is arranged in the thermal forming die, and the temperature of cooling water in the water cooling machine is 10-20 ℃.
7. The manufacturing process of the automobile door ring as claimed in claim 1, wherein in the hot forming step, after quenching, the yield strength of the door ring plate is not less than 950Mpa, the tensile strength is not less than 1350Mpa, and the elongation is not less than 5%.
8. The manufacturing process of the automotive door ring according to claim 1, wherein in the thermoforming step, the door ring sheet is taken out of the thermoforming mold when the temperature of the door ring sheet is 200 ℃ or less.
9. The process of claim 1, further comprising, after the step of thermoforming, repair welding the overlapping locations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111003492.6A CN113664474A (en) | 2021-08-30 | 2021-08-30 | Manufacturing process of automobile door ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111003492.6A CN113664474A (en) | 2021-08-30 | 2021-08-30 | Manufacturing process of automobile door ring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113664474A true CN113664474A (en) | 2021-11-19 |
Family
ID=78547327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111003492.6A Pending CN113664474A (en) | 2021-08-30 | 2021-08-30 | Manufacturing process of automobile door ring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113664474A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115431009A (en) * | 2022-10-14 | 2022-12-06 | 重庆至信实业集团有限公司 | Method and die for processing automobile half door ring |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08243770A (en) * | 1995-03-10 | 1996-09-24 | Mazda Motor Corp | Joining method for metal plate |
| JP2015033706A (en) * | 2013-08-08 | 2015-02-19 | 株式会社神戸製鋼所 | Spot laser composite weld joint |
| CN104507628A (en) * | 2012-08-08 | 2015-04-08 | 新日铁住金株式会社 | Method for welding overlapped part, method for manufacturing lap weld member, lap weld member, and component for automobile |
| JP2019000906A (en) * | 2017-06-15 | 2019-01-10 | トヨタ自動車株式会社 | Lap-welding method |
| CN208614060U (en) * | 2018-06-06 | 2019-03-19 | 佛山科学技术学院 | A kind of galvanized steel plain sheet laser welding lap joint structure |
| CN111496380A (en) * | 2020-04-28 | 2020-08-07 | 烟台凌云汽车工业科技有限公司 | Tailor welding manufacturing method of thin aluminum-silicon coated steel plate and manufacturing method of door ring |
-
2021
- 2021-08-30 CN CN202111003492.6A patent/CN113664474A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08243770A (en) * | 1995-03-10 | 1996-09-24 | Mazda Motor Corp | Joining method for metal plate |
| CN104507628A (en) * | 2012-08-08 | 2015-04-08 | 新日铁住金株式会社 | Method for welding overlapped part, method for manufacturing lap weld member, lap weld member, and component for automobile |
| JP2015033706A (en) * | 2013-08-08 | 2015-02-19 | 株式会社神戸製鋼所 | Spot laser composite weld joint |
| JP2019000906A (en) * | 2017-06-15 | 2019-01-10 | トヨタ自動車株式会社 | Lap-welding method |
| CN208614060U (en) * | 2018-06-06 | 2019-03-19 | 佛山科学技术学院 | A kind of galvanized steel plain sheet laser welding lap joint structure |
| CN111496380A (en) * | 2020-04-28 | 2020-08-07 | 烟台凌云汽车工业科技有限公司 | Tailor welding manufacturing method of thin aluminum-silicon coated steel plate and manufacturing method of door ring |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115431009A (en) * | 2022-10-14 | 2022-12-06 | 重庆至信实业集团有限公司 | Method and die for processing automobile half door ring |
| CN115431009B (en) * | 2022-10-14 | 2023-12-05 | 重庆至信实业集团有限公司 | Automobile half door ring processing method and mold |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10265797B2 (en) | Resistance spot welding method | |
| KR101744427B1 (en) | Spot welding method for high-strength steel sheet excellent in joint strength | |
| CN103917329B (en) | Hot-formed previously welded steel part with very high mechanical resistance, and production method | |
| CN104204257B (en) | Component and their manufacture method are pressed in forge hot pressure tailor welded and forge hot | |
| US20160228973A1 (en) | Resistance spot welding method | |
| CN104520052A (en) | Lap welded member, automobile component, method for welding lapped part, and method for manufacturing lap welded member | |
| US20180369897A1 (en) | Reinforcing structural components | |
| CN112437710B (en) | Steel sheet, tailor-welded blank, hot-press molded article, steel pipe, hollow quenched molded article, and method for producing these | |
| CN111496380B (en) | Tailor welding manufacturing method of thin aluminum-silicon coated steel plate and manufacturing method of door ring | |
| CN113664474A (en) | Manufacturing process of automobile door ring | |
| JP7047387B2 (en) | Manufacturing methods for steel sheets, butt welded members, hot pressed molded products, steel pipes, hollow hardened products, and steel plates. | |
| US20230339037A1 (en) | Resistance spot welding method and method for manufacturing resistance spot welded joint | |
| US11478877B2 (en) | Reinforcing structural components | |
| CN110587135B (en) | Welding method for preventing laser tailor-welded blank from stamping and cracking | |
| CN112045369A (en) | Wire feeding steady-state welding method for solid-state laser welding machine in high-latitude area | |
| CN102162026B (en) | Method for annealing weld joint of 45 steel on narrow lap welding machine | |
| CN105149810B (en) | Prevent the welding method of carbon equivalent high strip steel weld joint broken belt | |
| CN113146157B (en) | Laser welding method for 600 MPa-grade cold-rolled dual-phase steel hot-rolled substrate | |
| TW202027966A (en) | Steel sheet, tailor welded blank, hot press formed product, steel pipe, hollow quenched product, and manufacturing method of steel sheet | |
| US20230045352A1 (en) | Pre-coated steel sheet comprising an additional coating for increasing the mechanical strength of the weld metal zone of a welded steel part prepared from said pre-coated sheet. | |
| CN102009325B (en) | Method for improving corrosion resistance of weld joint of hastelloy conductive roller | |
| KR100757650B1 (en) | Apparatus for multi mash seam welding and method of welding thereof | |
| CN109420837A (en) | A kind of method of the anti-weld crack of high-carbon steel electron-bombardment welding | |
| JP2000015353A (en) | Welded joining metallic plate excellent in press formability and production thereof | |
| US11299794B2 (en) | Hot-forming line and method for producing hot-formed and press-quenched sheet-steel products |
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 | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20220425 Address after: 264006 No. 61, Shenzhen street, Yantai Economic and Technological Development Zone, Shandong Province Applicant after: LINGYUN JIENSI TECHNOLOGY Co.,Ltd. Address before: 264006 No. 61, Shenzhen street, Yantai Economic and Technological Development Zone, Shandong Province Applicant before: YANTAI LINGYUN AUTOMOBILE INDUSTRY TECHNOLOGY Co.,Ltd. |