CN100491051C - Fabrication technique for welding box cover and box body made from stainless steel sheet - Google Patents
Fabrication technique for welding box cover and box body made from stainless steel sheet Download PDFInfo
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- CN100491051C CN100491051C CNB2006100862827A CN200610086282A CN100491051C CN 100491051 C CN100491051 C CN 100491051C CN B2006100862827 A CNB2006100862827 A CN B2006100862827A CN 200610086282 A CN200610086282 A CN 200610086282A CN 100491051 C CN100491051 C CN 100491051C
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- case lid
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- pressing piece
- casing
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- 238000003466 welding Methods 0.000 title claims abstract description 67
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 9
- 239000010935 stainless steel Substances 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 title claims description 23
- 238000004519 manufacturing process Methods 0.000 title description 3
- 238000001816 cooling Methods 0.000 claims abstract description 42
- 238000003825 pressing Methods 0.000 claims abstract description 38
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- 239000002826 coolant Substances 0.000 claims description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- 238000012545 processing Methods 0.000 claims description 8
- 239000000498 cooling water Substances 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- 230000003068 static effect Effects 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 235000019628 coolness Nutrition 0.000 claims description 3
- 230000001590 oxidative effect Effects 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000007781 pre-processing Methods 0.000 claims description 3
- PTVDYARBVCBHSL-UHFFFAOYSA-N copper;hydrate Chemical compound O.[Cu] PTVDYARBVCBHSL-UHFFFAOYSA-N 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 12
- 238000009499 grossing Methods 0.000 abstract 1
- 230000035882 stress Effects 0.000 description 10
- 238000009434 installation Methods 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 230000035900 sweating Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 241000446313 Lamella Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000012809 cooling fluid Substances 0.000 description 1
- 230000000916 dilatatory effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000036314 physical performance Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 239000011882 ultra-fine particle Substances 0.000 description 1
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Abstract
A welding technology for the stainless steel sheet cover and the body of main inverter box used for track-type vehicle includes such steps as blanking, making holes for plug welding, removing burr, locating welding, plug welding while pressing, smoothing the cover surface, and local heating and cooling for correction purpose.
Description
Technical field
The present invention relates to the technique for welding of a kind of stainless sheet steel case lid and casing, particularly be applicable to the stainless sheet steel case lid of rail traffic vehicles master inversion case and the technique for welding of casing, belong to solder technology.
Background technology
The lamella thickness of said stainless sheet steel case is≤2mm, and case is inside and outside complex-shaped, the precision height of institute's erection unit, and to the strict harshness of its working environment, such as the main inversion case of rail traffic vehicles.This class veneer case, under the working condition of high-speed cruising big bump, the intensity of not only necessary its case lid of strict guarantee and casing welding definitely can not produce the crack seepage, and requires at 3mm/m for the flatness error on its case lid surface
2Below, utter long and high-pitched sounds to avoid under action of high-speed airflow, producing to vibrate to send.
The case lid of existing this class stainless sheet steel and the welding processing of casing generally adopt existing plug welding technology welding.The boring of spacing is arranged on the case lid of case lid and casing welding position, adopt the protection weldering to implement carrying out melting welding in the set boring of case lid, and realize the welding of case lid and casing.
This existing plug welding technology, because the stainless steel coefficient of expansion is big, and field of welding temperature and stress distribution are inhomogeneous, thereby are difficult to the welding deformation of the said thin plate case lid member of control; Because the weld seam cooling velocity is too fast or slow excessively, so that influences weld seam metallographic structure and mechanical property thereof, thereby be difficult to guarantee weld strength that crack and seepage fault also just are difficult to avoid; And case lid profile especially its surface planarity error is bigger, thereby makes the welding of said thin plate case lid and casing, does not reach the product design technology requirement for a long time, has drawn the back leg of bullet train career development.
Summary of the invention
Technical problem to be solved by this invention is, provide a kind of welding deformation little, the surface planarity error is little, the stainless sheet steel case lid and the casing technique for welding that are applicable to rail traffic vehicles master inversion case that weld strength is high are with the key problem in technology problem of this dilatory bullet train career development of effective solution.
The present invention solves it and wants the technical though of technical solution problem to be; the wave transformation rule that is produced according to the welding temperature change of stress field; employing is cooled off non-weld zone enforcement protectiveness the even load static pressure precompressed of said case lid; making it temperature remains constant; and the weld zone is in free shrink and as air-cooled condition is the slow state of cooling; thereby effectively reduce the distortion of said case lid; effectively protect weld seam; to obtain good metallographic structure and mechanical property, guarantee the intensity and the sealing property of weld seam.Simultaneously, in order further to reduce the distortion of said case lid postwelding, take artificial aging to handle, and said artificial aging is handled, be that the local heat cooling is corrected, promptly said case lid is implemented local heat, immediately hot spot is implemented cooling rapidly, with the said case lid stainless steel of further elimination because the distortion that irregular STRESS VARIATION was caused.That is to say, the present invention adopts the case lid workpiece to weld under the even load static pressure pressurization of the water tank of good heat conductivity cooling condition, correct in the partial flame heat medium cooling of implementing immediately after the welding under the dead load pressurized conditions with said case lid, realize the purpose that it will be realized.
For above-mentioned technical though, the present invention solves it and wants the technical scheme of technical solution problem to be,
A kind of stainless sheet steel case lid of attachment rail vehicular traffic master inversion case and technique for welding of casing of being applicable to, with casing with to offer the case lid that plug welding hole deburring preprocessing handles through blanking be soldered processing work, the tack welding that comprises case lid and casing successively, along workpiece case lid periphery and casing plug welding and case lid surfacing treatment step, its innovative point is:
A, the plug welding of said case lid periphery are carried out under the non-welding position pressurization of workpiece case lid, cooling condition;
B, after the surfacing treatment step, comprise that also local heat cooling corrects step.
The pressurization of said workpiece case lid, cooling are even load static pressure water tank pressurization coolings; And the pressurization that it adopted cooling module by the water tank of gripper shoe, internal memory cooling medium that bottom area is littler than peripheral plug welding scope, go up pressing piece and following pressing piece is formed; The process of its said pressurization cooling is, the workpiece case lid is located on the gripper shoe, and water tank is located at workpiece box and covers, and both connect airtight for no gap; Last pressing piece is pressed on the water tank, and following pressing piece withstands gripper shoe.This is the technical measures of the preferred a kind of cooling of implementing to pressurize of the present invention.The present invention does not get rid of and adopts technical measures such as pressurization is air-cooled.And said gripper shoe also can be made into the hollow support plate, and the chamber is provided with cooling water within it.And the cooling water in the water tank both can be actionless, also can be that turnover is flowed.This can determine according to the design feature of soldered workpiece and welding method and heat input size thereof.And cooling medium also can not adopt water, and adopts the big and heat exchange performance of other thermal capacity other liquid state or solid-state cooling medium preferably, and example adds chemical synthesis cooling fluid and ultra-fine particles heat-conducting metal flour sand or the like.
Said rectification is that the partial flame heat medium cooling under the dead load pressurized conditions is corrected; And the rectification module that it adopted is made up of gripper shoe, the moulded board that is provided with several through holes, last pressing piece, following pressing piece, flame gun and cooling medium shower nozzle; The process of its said rectification is, the workpiece case lid is located on the gripper shoe, moulded board is located at workpiece box and covers, and both connect airtight for no gap, last pressing piece is pressed on the moulded board, following pressing piece withstands gripper shoe, and flame gun is implemented local heat by the set through hole of moulded board to the workpiece case lid, and the cooling medium shower nozzle injects the local cooling of cooling medium enforcement rapidly in the set through hole of moulded board immediately.This is the preferred a kind of technical measures of implementing to correct of the present invention.Technical measures such as the present invention does not get rid of other local heat cooling correcting technology measure of employing, and for example local electrical heating is air-cooled.
Can understand that by above given technical scheme the present invention is a kind of static metal stamping and pressing cooling press Stress Control sheet metal member welding deformation, and static metal stamping and pressing compression is controlled the technique for welding that local heats cold is but corrected.Since its to leave weld seam have certain distance for example the sheet metal at 10mm place carry out protectiveness pressurization and cool off, and make its non-welding region be in for example 5～10 tons compressive stress state of big dead load, thereby stop welding heat to import non-welding region effectively, effectively controlled sweating heat distortion and stress deformation; Because the welding region of its Thin Stainless Steel board member is in free shrink and as air-cooled condition, thereby has effectively protected weld seam, avoid weld seam because cooling velocity is too fast, cause weld seam inside metallographic and mechanical property bad, and obtain the welding point of a high-quality.And the said correcting technology that adopts is in succession further eliminated it owing to weld the residual stress that is produced, flatness, rigidity and the intensity of guarantee fund's metal thin plate member.Because the present invention has adopted pressurization cooling solder technology and the but stack of correcting technology of local heats cold, has effectively guaranteed the quality of institute's welding processing workpiece, thereby has realized purpose of the present invention.
Further innovative point of the present invention is:
Said plug welding is middle to two face down bondings, and is the clearance-type balanced welding.Its purpose obviously is further effectively to reduce sweating heat distortion and stress deformation.
Said water tank is aluminum water block or copper water tank; And said water tank is open type water tank or sealed water tank.
Institute's pressing piece of saying and following pressing piece are jack.Except the employing jack is exerted pressure, can certainly adopt hydraulic package to implement pressurization.
Flame heat is the clearance-type heating of staggering, and adopts the oxidizing flame heating; The hot spot temperature is controlled in 550 ℃～600 ℃ scopes.Its purpose mainly is further to reduce workpiece thermal deformation and stress deformation, prevents the carburizing of workpiece box cap surface.
The said cooling medium of implementing local cooling is the special-purpose cooling water of stainless steel.The special-purpose cooling water of said stainless steel does not promptly have the chlorine cooling water.Its purpose is to prevent the workpiece box cap surface, because of grain boundary corrosion influences its corrosion resisting property and intensity.
After technique scheme is able to concrete enforcement, the technology that the present invention had is reasonable, technological equipment is simple and easy to assembly, the weldquality height, thermal deformation and stress deformation are little, and the surface planarity error is little, good physical performance such as rigidity and intensity, steady quality, characteristics such as practical working condition is normal are conspicuous.The contrast testing result shows the stainless sheet steel case lid surface planarity error≤1mm/m of welding processing of the present invention
2, reach 0.3mm/m
2, reduce nearly 10 times than prior art.
Description of drawings
Fig. 1 is the process chart of a kind of specific embodiment of the present invention;
Fig. 2 is a kind of workpiece case lid and the box body combinations state diagram of the soldered processing of the present invention; 7 is casing shown in the figure, and 7-1 is a fabrication hole, and 7-2 is and the rectangle hollow pipe of casing 7 sidewalls welding that 5-1 is the plug welding hole.The counterdie of water tank pressurization cooling module and rectification module can be by fabrication hole 7-1 assembling;
Fig. 3 is the installment state schematic diagram of the water tank pressurization cooling module of a kind of specific embodiment of the present invention, there is shown down pressing piece and withstands gripper shoe by mould bases;
Fig. 4 is the installment state schematic diagram that module is corrected in the partial flame heating cooling of a kind of specific embodiment of the present invention, there is shown pressing piece and compresses moulded board by top mold frame, and following pressing piece withstands gripper shoe by following mould bases;
Fig. 5 is the front view of moulded board as shown in Figure 4; There is shown a kind of horizontal layout state of through hole 6-1;
Fig. 6 is the A-A partial sectional view of Fig. 5, there is shown a kind of structure of through hole 6-1.
The specific embodiment
Below contrast accompanying drawing, the description by the specific embodiment is further described the present invention, but is not subjected to described restriction.
A kind of specific embodiment of the present invention please be joined and be read accompanying drawing 1,2,3.
A kind of stainless sheet steel case lid of rail traffic vehicles master inversion case and technique for welding of casing (shown in accompanying drawing 1,2) of being applicable to, with casing with to offer the case lid that plug welding hole deburring preprocessing handles through blanking be soldered processing work, the tack welding that comprises case lid and casing successively, along workpiece case lid periphery and casing plug welding and case lid surfacing treatment step, and the plug welding of said case lid periphery is carried out under the non-welding position pressurization of workpiece case lid, cooling condition; After the surfacing treatment step, also comprise local heat cooling rectification step.Said plug welding is middle to two face down bondings, and is the clearance-type balanced welding.
As shown in Figure 3, the pressurization of said workpiece case lid, cooling are even load static pressure water tank pressurization coolings; And the pressurization that it adopted cooling module by the water tank 2 of gripper shoe 1, internal memory cooling medium that bottom area is littler than peripheral plug welding scope, go up pressing piece jack 3 and following pressing piece jack 4 is formed; The process of its said pressurization cooling is, workpiece case lid 5 is located on the gripper shoe 1, and water tank 2 is located on the workpiece case lid 5, and both connect airtight for no gap; Last pressing piece jack 3 is pressed on the water tank 2, and following pressing piece jack 4 withstands gripper shoe 1.Said water tank 2 is aluminum water blocks; And said water tank 2 is open type water tanks.Its specific embodiment is:
Pressing piece jack installation → leveling pressurization → detection slit and pressure size are installed → gone up to gripper shoe installation → following pressing piece jack installation → aluminum radiator, realizes that by pressure regulation workpiece case lid and water tank do not have the gap and connect airtight → weld → cool off → polish the smooth processing of deburring → surface finish.
Shown in accompanying drawing 4,5,6, said rectification is that the partial flame heat medium cooling under the dead load pressurized conditions is corrected; And the rectification module that it adopted is formed (flame gun and water-cooling-sprayer do not draw in the drawings) by gripper shoe 1, the moulded board 6 that is provided with several through holes 6-1 that arranges by designing requirement, last pressing piece jack 3, following pressing piece jack 4, flame gun and cooling medium shower nozzle; The process of its said rectification is, workpiece case lid 5 is located on the gripper shoe 1, moulded board 6 is located on the workpiece case lid 5, and both connect airtight for no gap, last pressing piece jack 3 is pressed on the moulded board 6, following pressing piece jack 4 withstands gripper shoe 1, and flame gun is implemented local heat by moulded board 6 set through hole 6-1 to case lid 5, and the cooling medium shower nozzle injects the local cooling of cooling medium enforcement rapidly in moulded board 6 set through hole 6-1 immediately.The thickness of moulded board 6 is 30mm, and the taper hole major diameter of its set through hole 6-1 is in φ 40～50mm scope, and minor diameter is φ 18mm, and the axial length of φ 18mm straight hole is 5mm.The density of through hole 6-1 is 3/10cm
2Flame heat is the clearance-type heating of staggering, and adopts the oxidizing flame heating; The hot spot temperature is controlled in 550 ℃～600 ℃ scopes.Said cooling medium is the special-purpose cooling water of stainless steel.Its specific embodiment is:
Pressing piece jack installation → leveling pressurization → detection slit and pressure size are installed → gone up to gripper shoe installation → following pressing piece jack installation → perforate moulded board; By pressure regulation, realize that workpiece case lid and moulded board do not have the gap and connect airtight → the local cooling → descale of flame local heat → water filling → seal tightness test → finished product.
Range of application of the present invention is not subjected to the restriction of this declarative description.
Claims (6)
1, a kind of stainless sheet steel case lid of rail traffic vehicles master inversion case and technique for welding of casing of being applicable to, with casing with to offer the case lid that plug welding hole deburring preprocessing handles through blanking be soldered processing work, the tack welding that comprises case lid and casing successively, along workpiece case lid periphery and casing plug welding and case lid surfacing treatment step, it is characterized in that:
A, the plug welding of said case lid periphery are carried out under the non-welding position pressurization of workpiece case lid, cooling condition; And the pressurization of said workpiece case lid, cooling are even load static pressure water tank pressurization coolings; And the pressurization that it adopted cooling module by the water tank (2) of gripper shoe (1), internal memory cooling medium that bottom area is littler than peripheral plug welding scope, go up pressing piece (3) and following pressing piece (4) is formed; The process of its said pressurization cooling is, workpiece case lid (5) is located on the gripper shoe (1), and water tank (2) is located on the workpiece case lid (5), and both contact for no gap; Last pressing piece (3) is pressed on the water tank (2), and following pressing piece (4) withstands gripper shoe (1).
B, after the surfacing treatment step, comprise that also local heat cooling corrects step; And said rectification is that the partial flame heat medium cooling under the dead load pressurized conditions is corrected; And the rectification module that it adopted is made up of gripper shoe (1), the moulded board (6) that is provided with several through holes (6-1), last pressing piece (3), following pressing piece (4), flame gun and cooling medium shower nozzle; The process of its said rectification is, workpiece case lid (5) is located on the gripper shoe (1), moulded board (6) is located on the workpiece case lid (5), and both are the contact of no gap, last pressing piece (3) is pressed on the moulded board (6), following pressing piece (4) withstands gripper shoe (1), and flame gun is implemented local heat by the set through hole of moulded board (6) (6-1) to workpiece case lid (5), and the cooling medium shower nozzle injects the local cooling of cooling medium enforcement rapidly in the set through hole of moulded board (6) (6-1) immediately.
2, the technique for welding of stainless sheet steel case lid according to claim 1 and casing is characterized in that: said plug welding is middle to two face down bondings, and is the clearance-type balanced welding.
3, the technique for welding of stainless sheet steel case lid according to claim 1 and casing is characterized in that: said water tank (2) is aluminum water block or copper water tank; And said water tank (2) is open type water tank or sealed water tank.
4, the technique for welding of stainless sheet steel case lid according to claim 1 and casing is characterized in that: institute's pressing piece of saying (3) and following pressing piece (4) are jack or hydraulic package.
5, the technique for welding of stainless sheet steel case lid according to claim 1 and casing is characterized in that: flame heat is the clearance-type heating of staggering, and adopts the oxidizing flame heating; The hot spot temperature is controlled in 550 ℃～600 ℃ scopes.
6, the technique for welding of stainless sheet steel case lid according to claim 1 and casing is characterized in that: the said cooling medium of implementing local cooling is the special-purpose cooling water of stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100862827A CN100491051C (en) | 2006-08-29 | 2006-08-29 | Fabrication technique for welding box cover and box body made from stainless steel sheet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100862827A CN100491051C (en) | 2006-08-29 | 2006-08-29 | Fabrication technique for welding box cover and box body made from stainless steel sheet |
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| CN1915574A CN1915574A (en) | 2007-02-21 |
| CN100491051C true CN100491051C (en) | 2009-05-27 |
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| CN101913042A (en) * | 2010-08-30 | 2010-12-15 | 赵显华 | Sheet metal welding device for reducing deformation and stress of steel plate |
| CN102672359B (en) * | 2012-05-14 | 2014-04-23 | 福建荣盛钢结构实业有限公司 | Process for manufacturing rectangular box pipe |
| CN103567710B (en) * | 2012-07-25 | 2015-12-09 | 昆山荣科钣金科技有限公司 | The preparation technology of stainless steel water tank |
| CN103753035A (en) * | 2013-12-17 | 2014-04-30 | 西安轨道交通装备有限责任公司 | Connecting method for heat preservation shell of asphalt truck |
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| CN106181220B (en) * | 2016-08-25 | 2018-04-06 | 中车青岛四方机车车辆股份有限公司 | Flame repairing technique after a kind of aluminum alloy welding |
| CN106816663B (en) * | 2017-02-24 | 2020-09-08 | 中南大学 | Method for efficiently and safely discharging waste lithium ion batteries |
| CN108296609B (en) * | 2018-02-08 | 2020-01-31 | 辽宁忠旺铝合金精深加工有限公司 | Welding process of totally-enclosed aluminum alloy side-rolling-prevention multifunctional cabinet |
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| CN110788453B (en) * | 2019-11-28 | 2022-02-08 | 南通科硕海洋装备科技有限公司 | Plug welding method for sheet metal parts |
| CN110899915A (en) * | 2019-12-11 | 2020-03-24 | 湖南武陵机械制造有限公司 | Garbage can top plate welding springback method |
| CN110899916A (en) * | 2019-12-11 | 2020-03-24 | 湖南武陵机械制造有限公司 | Method for preventing inner frame of garbage can from rebounding and deforming during welding |
| CN110899917A (en) * | 2019-12-11 | 2020-03-24 | 湖南武陵机械制造有限公司 | Reversible deformation welding method for inner die of garbage can |
| CN112404170A (en) * | 2020-10-30 | 2021-02-26 | 广州黄船海洋工程有限公司 | Water and fire correction method for thin plate component by using porous correction template |
| CN115178985A (en) * | 2022-08-29 | 2022-10-14 | 重庆水轮机厂有限责任公司 | Assembly welding method for turbine overflow surface wear plate |
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Assignee: Changzhou Tiger Plato KTK Traffic Equipment Co., Ltd. Assignor: Kik Group Co., Ltd. Contract record no.: 2010320000710 Denomination of invention: Fabrication technique for welding box cover and box body made from stainless steel sheet Granted publication date: 20090527 License type: Exclusive License Open date: 20070221 Record date: 20100528 |
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Owner name: KTK GROUP CO., LTD. Free format text: FORMER NAME: JINCHUANG CO., LTD. |
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Address after: 213102 Jiangsu City, Wujin Province, the town of the town of road, No. 88-89 Patentee after: KTK GROUP CO., LTD. Address before: 213011 Industry Park, remote town, Wujin District, Jiangsu, Changzhou Patentee before: Kik Group Co., Ltd. |
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Change date: 20151109 Contract record no.: 2010320000710 Assignor after: KTK GROUP CO., LTD. Assignor before: Kik Group Co., Ltd. |
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Assignee: Changzhou Tiger Plato KTK Traffic Equipment Co., Ltd. Assignor: KTK GROUP CO., LTD. Contract record no.: 2010320000710 Date of cancellation: 20151127 |
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Effective date of registration: 20210528 Address after: No.18-2, Fengming Road, South District, Wujin high tech Industrial Development Zone, Changzhou City, Jiangsu Province 213000 Patentee after: CHANGZHOU CHANGKUANG HOISTING MACHINERY Co.,Ltd. Address before: 213102 88-89 Chuang Chuang Road, Yao Guan Town, Wujin District, Changzhou, Jiangsu Patentee before: KTK GROUP Co.,Ltd. |
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