CN103572283B - The laser reinforcing process of perforating head - Google Patents
The laser reinforcing process of perforating head Download PDFInfo
- Publication number
- CN103572283B CN103572283B CN201310537063.6A CN201310537063A CN103572283B CN 103572283 B CN103572283 B CN 103572283B CN 201310537063 A CN201310537063 A CN 201310537063A CN 103572283 B CN103572283 B CN 103572283B
- Authority
- CN
- China
- Prior art keywords
- alloy layer
- laser
- perforating head
- alloy
- transition
- 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.)
- Active
Links
Landscapes
- Laser Beam Processing (AREA)
Abstract
The present invention relates to a kind of laser reinforcing process of perforating head, first laser melting coating transition alloy layer on perforating head matrix surface, then on transition alloy layer laser melting coating high-strength alloy layer; The powdered alloy that described transition alloy layer adopts is nickel-base alloy, and the powdered alloy that described high-strength alloy layer adopts is cobalt base alloy.In this technique, transition alloy layer hardness ratio high-strength alloy layer is low, the high-strength alloy layer of hard high-wearing feature is played a transition role, built-up welding stress can well be alleviated, even if make top not preheating, unannealed, residual built-up welding stress also can not cause very large impact to the tissue of laser cladding layer, thus effectively avoid and carry out annealing and can affect cladding layer capability, perforating head surface hardness and wear resistance are significantly improved, saves preheating and annealing process also improves production efficiency simultaneously.
Description
The application is divisional application, the application number of original application: 201210248964.9, invention and created name: the laser reinforcing process of perforating head, the applying date: 2012-07-18.
Technical field
The present invention relates to a kind of laser cladding method, especially a kind of laser cladding method of perforating head surface.
Background technology
Along with the increase of China's weldless steel tube export volume, the consumption producing the spare part that weldless steel tube uses also increases year by year.Perforating head is the key tool of producing weldless steel tube, and the quality of the quality of perforating head and the length in work-ing life have direct impact to the Yield and quality of weldless steel tube and production cost.Perforating head operationally temperature is very high, and bears very large compound stress, there will be distortion in using, subside, steel bonding, the inefficacy such as cracking.China has the perforating head more than 1,000,000 to go out of use because of failure cause every year, and this numeral just increases year by year with the speed of more than 15%.If by these lost efficacy or new perforating head utilize laser melting and coating technique to process its surface, the more than one hundred million unit of materials cost can be saved every year.
The temperature that perforating head nose bears at work, friction ratio, impact are the highest, are positions the most easy to wear.Use laser melting and coating technique at the alloy material of outside surface built-up welding a layer thickness high temperature resistant, wear-resistant, high rigidity uniformly of perforating head nose, can make greatly improve the work-ing life of perforating head.At present, both at home and abroad for the laser melting and coating technique that perforating head adopts, be generally coming directly towards nickel base alloy layer or the cobalt-based alloy layer of outside surface built-up welding one deck hard high-wearing feature.Such as: Chinese patent literature CN101596551B(application number is: 200910088534.3) disclose a kind of pairing gold plating seamless steel tube top, Ni-based or the Co-based alloy coating at nose, the operate portions laser wide-band cladding of top, in aligning portion, parallel portion laser wide-band cladding iron alloy coating, obtain a kind of pairing gold plating seamless steel tube top.This pairing gold plating seamless steel tube top is at the different alloy layer of the different sites cladding of top.
Perforating head is in the process of laser melting coating, and inevitably produce built-up welding stress, these stress must be eliminated in time, otherwise cause fatal destruction to the tissue of laser cladding layer.Perforating head laser melting and coating process of the prior art all must carry out preheating to top, and anneals after built-up welding terminates, and to eliminate stress, not only operation is loaded down with trivial details, and production efficiency is slow, the hardness of cladding layer also can be made to reduce, there is certain problem.
Summary of the invention
The technical problem to be solved in the present invention is to provide one and carries out laser melting coating to perforating head surface, without the need to preheating before laser melting coating, without the need to annealing after laser melting coating, the laser reinforcing process of the perforating head that perforating head surface hardness and wear resistance can be made significantly to improve.
In order to solve the problems of the technologies described above, the invention provides a kind of laser reinforcing process of perforating head, first laser melting coating transition alloy layer on perforating head matrix surface, then on transition alloy layer laser melting coating high-strength alloy layer; The powdered alloy that described transition alloy layer adopts is nickel-base alloy, and the powdered alloy that described high-strength alloy layer adopts is cobalt base alloy.
The built-up welding stress produced in laser cladding process better can be alleviated in order to make transition alloy layer, a kind of preferred technical scheme is: the component of above-mentioned nickel-base alloy and weight percent content are C≤0.03%, Cr:15% to 19%, B:0.8% to 1.2%, Si:2% to 2.5%, all the other are Ni.Powdered alloy strictly controls the content of C, makes it be not more than 0.03%, is conducive to the wettability improving cladding layer, prevents from cracking in cladding process and pore; Simultaneously alloy is made to form matrix based on austenite after solidification by appropriate B, the Si of interpolation in powdered alloy; Cr element appropriate has in addition carried out alloy strengthening to nickel-base alloy.Although transition alloy layer at high temperature hardness is less than high-strength alloy layer, still there is good welding characteristic and mechanical property.
In order to make high-strength alloy layer, at high temperature there is higher hardness and wear resistance, a kind of preferred technical scheme is: the component of above-mentioned cobalt base alloy and weight percent content are C≤0.1%, Cr:19% to 21%, B:1.5% to 2.5%, Si:1.5% to 2.5%, W:5.5% to 6.5%, Ti:0.5% to 1.5%, Al:3% to 5%, all the other are Co.Powdered alloy strictly controls the content of C, makes it be not more than 0.1%, is conducive to the wettability improving cladding layer, prevents from cracking in cladding process and pore; Simultaneously alloy is made to form matrix based on austenite after solidification by appropriate B, the Si of interpolation in powdered alloy; Cr, W, Ti, Al element appropriate has in addition carried out alloy strengthening to cobalt base alloy, and plays antioxygenation, and high-strength alloy layer hardness at high temperature, wear resistance and welding characteristic are significantly promoted.
In laser cladding process, heat is concentrated in top nose tip, and a kind of preferred technical scheme is: adopt sectional type laser cladding method, from the nose tip of perforating head, carry out cladding piecemeal from front to back.Adopt the built-up welding stress that can make in this way to produce in laser cladding process more to disperse, reach stress equilibrium, even if thus ensure further not preheating, unannealed, built-up welding stress also can not affect the performance of cladding layer.
In order to better eliminate the built-up welding stress produced in laser cladding process, a kind of preferred technical scheme is: in laser cladding process, carry out vibration stress relief treatment to perforating head.Adopt this when stress produces just timely method of disperse even to eliminate, effectively can eliminate part built-up welding stress, even if thus further guarantee not preheating, unannealed, built-up welding stress also can not affect the performance of cladding layer.
In order to ensure the performance of cladding layer, better eliminate built-up welding stress, a kind of preferred technical scheme is: laser melting coating adopts the mode of preset powder feeding, is that light source carries out the scanning of continuous helical feeding overlap joint to perforating head with fast-transverse-flow CO2 laser; Laser power is 1500W to 1900W, and absolute altitude is 260mm to 275mm, and spot size is 10mm × 1.8mm, and sweep velocity is 110mm/min to 140mm/min, and amount of lap is 6.5mm, and powder sending quantity is 12g/min to 18g/min.Adopt broad band laser bundle, contribute to the efficiency of raising work; Adopt the mode of preset powder feeding, strict control powder sending quantity, and laser power, sweep velocity, amount of lap etc. are optimized, can make bores a hole, and to determine the deflection of head little, the fusion rate of cladding layer and matrix is high, combine closely, the homogeneity of structure of cladding layer is good, thickness and hardness even.
In order to make perforating head obtain better strengthening effect, and ensure the quality of the rear perforating head of strengthening, a kind of preferred technical scheme is: before laser melting coating, carry out pre-treatment to the surface of perforating head; After laser melting coating, perforating head is detected.
Technique scheme of the present invention has the following advantages compared to existing technology: laser reinforcing process first first laser melting coating one deck transition alloy layer on matrix of perforating head of the present invention, laser melting coating one deck high-strength alloy layer on transition alloy layer again, transition alloy layer hardness ratio high-strength alloy layer is low, the high-strength alloy layer of hard high-wearing feature is played a transition role, built-up welding stress can well be alleviated.Even if this technique makes top not preheating, unannealed, residual built-up welding stress also can not cause very large impact to the tissue of laser cladding layer, thus effectively avoid and carry out annealing and can affect cladding layer capability, perforating head surface hardness and wear resistance are significantly improved, hardness can reach 58 to 62HRC, saves preheating and annealing process also improves production efficiency simultaneously.This technique makes perforating head longer service life, also can be used for perforating head inefficacy to repair, be conducive to saving material and resource, be conducive to reducing seamless steel tube production cost, be conducive to reducing the pollution of discarded perforating head to environment, there is good economic benefit and social benefit.
Embodiment
The concrete steps of the laser reinforcing process of the perforating head of the present embodiment are as follows:
A. pre-treatment is carried out to the surface of perforating head.
By removings such as the dust on perforating head, greasy dirt, corrosions; Detect the size at each position; And clean.
B. laser melting coating is carried out to the surface of perforating head.
Adopt sectional type laser cladding method, from the nose tip of perforating head, (top nose tip is front end, and top external diameter maximum is rear end) carries out laser melting coating to the surface of perforating head piecemeal from front to back.First cladding one deck transition alloy layer on perforating head matrix surface, then on transition alloy layer cladding one deck high-strength alloy layer.In laser cladding process, ceaselessly knock perforating head with copper rod, perforating head is vibrated thus eliminates welding stress.
Laser melting coating adopts the mode of preset powder feeding, is that light source carries out the scanning of continuous helical feeding overlap joint to perforating head with fast-transverse-flow CO2 laser.Laser power is 1700W, and absolute altitude (namely laser apparatus is from the distance between Substrate, absolute altitude=focal length+defocusing amount) is 270mm, and spot size is 10mm × 1.8mm, and sweep velocity is 120mm/min, and amount of lap is 6.5mm, and powder sending quantity is 15g/min.The powdered alloy that transition alloy layer adopts is nickel-base alloy, and its component and weight percent content are C:0.03%, Cr:17%, B:1%, Si:2.2%, and all the other are Ni.The powdered alloy that high-strength alloy layer adopts is cobalt base alloy, and its component and weight percent content are C:0.1%, Cr:20%, B:2%, Si:2%, W:6%, Ti:1%, Al:4%, and all the other are Co.
C., after laser melting coating terminates, perforating head is detected.
Detect surface hardness; Detect deflection; According to the requirement of drawing, mechanical workout is carried out to perforating head surface; Carry out permeation flaw detection, detect the defect whether having the impact top mechanical propertys such as pore, slag inclusion, slight crack; Verify, whether quality inspection is qualified.
Obviously, above-described embodiment is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And these belong to spirit institute's apparent change of extending out of the present invention or change and are still among protection scope of the present invention.
Claims (1)
1. a laser reinforcing process for perforating head, is characterized in that: first laser melting coating transition alloy layer on perforating head matrix surface, then on transition alloy layer laser melting coating high-strength alloy layer; The powdered alloy that described transition alloy layer adopts is nickel-base alloy, and the powdered alloy that described high-strength alloy layer adopts is cobalt base alloy;
The component of described nickel-base alloy and weight percent content are C=0.03%, Cr: 15% to 19%, B: 0.8% to 1.2%, Si: 2% to 2.5%, and all the other are Ni;
The component of described cobalt base alloy and weight percent content are C=0.1%, Cr: 19% to 21%, B: 1.5% to 2.5%, Si: 1.5% to 2.5%, W: 5.5% to 6.5%, Ti: 0.5% to 1.5%, Al: 3% to 5%, and all the other are Co;
Laser melting coating adopts the mode of preset powder feeding, is that light source carries out the scanning of continuous helical feeding overlap joint to perforating head with fast-transverse-flow CO2 laser; Laser power is 1500W to 1900W, and absolute altitude is 260mm to 275mm, and spot size is 10mm × 1.8mm, and sweep velocity is 110mm/min to 140mm/min, and amount of lap is 6.5mm, and powder sending quantity is 12g/min to 18g/min;
In laser cladding process, vibration stress relief treatment is carried out to perforating head.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210248964 CN102732878B (en) | 2012-07-18 | 2012-07-18 | Laser strengthening process of piercing point |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201210248964 Division CN102732878B (en) | 2012-07-18 | 2012-07-18 | Laser strengthening process of piercing point |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103572283A CN103572283A (en) | 2014-02-12 |
| CN103572283B true CN103572283B (en) | 2015-09-23 |
Family
ID=46989159
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310537063.6A Active CN103572283B (en) | 2012-07-18 | 2012-07-18 | The laser reinforcing process of perforating head |
| CN201310537031.6A Active CN103572281B (en) | 2012-07-18 | 2012-07-18 | Without the need to the laser reinforcing process of the perforating head of annealing after laser melting coating |
| CN 201210248964 Expired - Fee Related CN102732878B (en) | 2012-07-18 | 2012-07-18 | Laser strengthening process of piercing point |
Family Applications After (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310537031.6A Active CN103572281B (en) | 2012-07-18 | 2012-07-18 | Without the need to the laser reinforcing process of the perforating head of annealing after laser melting coating |
| CN 201210248964 Expired - Fee Related CN102732878B (en) | 2012-07-18 | 2012-07-18 | Laser strengthening process of piercing point |
Country Status (1)
| Country | Link |
|---|---|
| CN (3) | CN103572283B (en) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103343339B (en) * | 2013-06-29 | 2015-10-07 | 苏州唐氏机械制造有限公司 | The laser repair method of Drawing Die |
| CN103769794A (en) * | 2014-01-07 | 2014-05-07 | 烟台开发区蓝鲸金属修复有限公司 | Strengthening method of surface of piercing plug of seamless steel tube rolling mill |
| CN103898518B (en) * | 2014-03-24 | 2017-04-19 | 杭州大冶激光科技有限公司 | Repairing method of cracks on roll surface of back-up roll of rolling mill |
| CN104588931A (en) * | 2014-12-04 | 2015-05-06 | 常州大学 | Surfacing method for seamless tube piercing plug |
| CN105018857A (en) * | 2015-08-06 | 2015-11-04 | 宁波市鄞州文昌金属制品有限公司 | High-temperature-resistant steel pipe piercing plug |
| CN105039972A (en) * | 2015-08-06 | 2015-11-11 | 宁波市鄞州文昌金属制品有限公司 | Abrasion-resistant steel pipe piercing plug |
| CN107243587B (en) * | 2017-06-10 | 2019-04-26 | 南京采青五金制品有限公司 | A kind of punching machine rushes stick |
| CN108179417B (en) * | 2018-01-17 | 2019-12-06 | 河南省煤科院耐磨技术有限公司 | manufacturing method of large-size bimetal wear-resistant corrosion-resistant composite plate |
| CN108425034A (en) * | 2018-04-03 | 2018-08-21 | 烟台万隆真空冶金股份有限公司 | A kind of surface reinforcing method of beryllium copper Casting Roller set |
| CN109136802B (en) * | 2018-08-15 | 2020-05-29 | 沈阳工业大学 | Laser pretreatment corrosion-resistant strengthening process for aluminum alloy |
| CN110042387A (en) * | 2019-04-01 | 2019-07-23 | 西安理工大学 | A kind of 40Cr steel surface build-up wear-resistant layer and preparation method thereof |
| CN110205561B (en) * | 2019-06-20 | 2021-02-12 | 芜湖点金机电科技有限公司 | Reinforced seamless steel pipe piercing plug and preparation method thereof |
| CN110699687B (en) * | 2019-11-18 | 2022-06-14 | 成都青石激光科技有限公司 | Method for strengthening high-nickel copper alloy glass mold |
| CN111020566A (en) * | 2019-12-20 | 2020-04-17 | 株洲辉锐增材制造技术有限公司 | Motor shaft gray cast iron end cover surface laser cladding modification method and application thereof |
| CN112474808A (en) * | 2020-11-10 | 2021-03-12 | 九江职业大学应用技术研究所 | Seamless steel pipe piercing plug and preparation method thereof |
| CN112846637A (en) * | 2021-01-15 | 2021-05-28 | 中铁工程装备集团有限公司 | In-situ repairing method for collapse of support surface of cutter shaft of heading machine and cutter shaft of heading machine |
| CN113913722A (en) * | 2021-09-23 | 2022-01-11 | 泰尔(安徽)工业科技服务有限公司 | Surface composite coating of mandrel for rolling seamless steel tube and preparation method thereof |
| CN114481127A (en) * | 2022-02-10 | 2022-05-13 | 安徽中科春谷激光产业技术研究院有限公司 | Cladding process for laser cladding reinforced punch |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2926886B2 (en) * | 1990-05-18 | 1999-07-28 | 大同特殊鋼株式会社 | Composite material and method for producing the same |
| EP1103628A2 (en) * | 1999-11-23 | 2001-05-30 | General Electric Company | A coating system for providing environmental protection to a metal substrate |
| CN1932082A (en) * | 2006-10-12 | 2007-03-21 | 沈阳大陆激光成套设备有限公司 | Fast laser depositing process of preparing antinwear heat resistant composite coating on surface of crystallizer |
| CN101519778A (en) * | 2008-02-26 | 2009-09-02 | 宝山钢铁股份有限公司 | Laser cladding method for strengthening surface of piercing point |
| CN102453904A (en) * | 2010-10-26 | 2012-05-16 | 沈阳大陆激光成套设备有限公司 | Method for preparing wear-resistant coating on surface of driving sheave race of elevator by laser cladding |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003193216A (en) * | 2001-12-25 | 2003-07-09 | Tocalo Co Ltd | Sprayed-deposit-coated member with excellent corrosion resistance and wear resistance, and its manufacturing method |
| CN1737197A (en) * | 2005-09-01 | 2006-02-22 | 上海交通大学 | Crack controlling means for laser deposition formed metal parts |
| CN101596551B (en) * | 2009-07-03 | 2010-11-03 | 北京工业大学 | Binary alloy coating seamless steel tube top and manufacture method thereof |
-
2012
- 2012-07-18 CN CN201310537063.6A patent/CN103572283B/en active Active
- 2012-07-18 CN CN201310537031.6A patent/CN103572281B/en active Active
- 2012-07-18 CN CN 201210248964 patent/CN102732878B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2926886B2 (en) * | 1990-05-18 | 1999-07-28 | 大同特殊鋼株式会社 | Composite material and method for producing the same |
| EP1103628A2 (en) * | 1999-11-23 | 2001-05-30 | General Electric Company | A coating system for providing environmental protection to a metal substrate |
| CN1932082A (en) * | 2006-10-12 | 2007-03-21 | 沈阳大陆激光成套设备有限公司 | Fast laser depositing process of preparing antinwear heat resistant composite coating on surface of crystallizer |
| CN101519778A (en) * | 2008-02-26 | 2009-09-02 | 宝山钢铁股份有限公司 | Laser cladding method for strengthening surface of piercing point |
| CN102453904A (en) * | 2010-10-26 | 2012-05-16 | 沈阳大陆激光成套设备有限公司 | Method for preparing wear-resistant coating on surface of driving sheave race of elevator by laser cladding |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103572283A (en) | 2014-02-12 |
| CN103572281B (en) | 2015-09-30 |
| CN103572281A (en) | 2014-02-12 |
| CN102732878B (en) | 2013-12-18 |
| CN102732878A (en) | 2012-10-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103572283B (en) | The laser reinforcing process of perforating head | |
| CN102352508B (en) | Iron-based alloy powder for laser cladding of TRT (Blast Furnace Top Pressure Recovery Turbine Unit) parts | |
| CN103409758B (en) | Pump shells and blade microcrack laser reinforcing life-prolonging method | |
| CN103521886B (en) | For the welding method of stainless steel single face welding and double face shaping | |
| CN103668183B (en) | The laser repairing process of the vehicle mould of good welding performance | |
| CN103572280B (en) | Without the need to the laser reinforcing process of the perforating head of preheating before laser melting coating | |
| CN102179601B (en) | CO2 gas protection welding process of 800 MPa high-strength steel | |
| CN101508053A (en) | Welding method of high-nickel alloy and stainless steel dissimilar metal | |
| CN103668175B (en) | Be beneficial to the laser cladding repair technique of the thin-wall sleeve reducing built-up welding static stress and distortion | |
| CN102677046B (en) | Alloy composite special for laser cladding of rolling mill housings | |
| CN102744498A (en) | Method for welding specially-thick high-strength bridge steel plate | |
| CN103668036B (en) | The laser cladding repair technique of the valve seat that hardness is high and deflection is little | |
| CN111283308B (en) | All-position shielded metal arc welding process for ultralow-temperature 304LN austenitic stainless steel medium plate | |
| CN104259633A (en) | Efficient single-face submerged arc welding method | |
| CN106480380A (en) | A kind of laser manufactures the iron(-)base powder of low-speed heave-load marine diesel engine piston annular groove | |
| CN109848526A (en) | A kind of marine high strength steel plate double wire hidden arc welding welding procedure | |
| CN103572282B (en) | A kind of laser cladding method of perforating head surface | |
| CN106270966B (en) | A kind of process for welding low-temperature spheroidal iron and manganese steel plate | |
| CN104233281B (en) | A kind of Co-based alloy powder that repairs for supercharger nozzle ring of internal-combustion engine | |
| CN103668180B (en) | With the laser repairing process of the compact vehicle mould in die wear position | |
| CN111843111B (en) | Wear-resistant metal composite plate and manufacturing method thereof | |
| CN104226976B (en) | A kind of Co-based alloy powder for internal-combustion engine booster gas inlet shell laser repairing | |
| CN106567063A (en) | A hot roller laser restoration method allowing surface hardness after restoration to be 58 HRC or above | |
| CN113579430B (en) | Narrow-slit submerged arc welding method suitable for medium plate wear-resistant steel | |
| CN114473144A (en) | Gas shielded welding method for welding X7Ni9 and S31603 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: CHONGQING RADIO AND TV UNIVERSITY, LU XUZHI Free format text: FORMER OWNER: JIANG CHUNHUA Effective date: 20150825 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Liu Yong Inventor before: Deng Qilin |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: DENG QILIN TO: LIU YONG |
|
| TA01 | Transfer of patent application right |
Effective date of registration: 20150825 Address after: 400039 Chongqing hi tech Zone, Shiqiaopu Branch Park Road No. 9 Applicant after: Chongqing Radio and TV University, Lu Xuzhi Address before: Jiaocun Tang Xin Zhuang Street East Gui Village 214200 Jiangsu city in Wuxi Province, Yixing City, No. 190 Applicant before: Jiang Chunhua |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20161215 Address after: 400900 Chongqing Dazu District Water Dragon hardware Industrial Park Industrial Park Patentee after: CHONGQING CITY DAZU DISTRICT QILIN MACHINERY MANUFACTURING FACTORY Address before: 400039 Chongqing hi tech Zone, Shiqiaopu Branch Park Road No. 9 Patentee before: CHONGQING RADIO & TV UNIVERSITY |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20191113 Address after: 221300 north side of Qingnian East Road, Yunhe Town, Pizhou City, Xuzhou City, Jiangsu Province Patentee after: Pizhou Runhong Industry Co., Ltd. Address before: 400900 Chongqing Dazu District Water Dragon hardware Industrial Park Industrial Park Patentee before: Chongqing City Dazu District Qilin Machinery Manufacturing Factory |