CN109267060B - Method for repairing worn spindle flat head sleeve of roughing mill - Google Patents
Method for repairing worn spindle flat head sleeve of roughing mill Download PDFInfo
- Publication number
- CN109267060B CN109267060B CN201811135002.6A CN201811135002A CN109267060B CN 109267060 B CN109267060 B CN 109267060B CN 201811135002 A CN201811135002 A CN 201811135002A CN 109267060 B CN109267060 B CN 109267060B
- Authority
- CN
- China
- Prior art keywords
- roughing mill
- flat head
- head sleeve
- spindle
- sleeve
- 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
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/058—Alloys based on nickel or cobalt based on nickel with chromium without Mo and W
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention relates to a method for repairing a worn main shaft flat head sleeve of a roughing mill, which comprises the following steps: s1, determining the damaged part and the abrasion loss of the spindle flat head sleeve of the roughing mill; s2, carrying out metallographic detection on the roughing mill spindle lug sleeve; s3, cleaning a fatigue layer at the damaged part of the spindle flat head sleeve of the roughing mill and exposing a fresh metal surface; s4: analyzing the chemical components of the roughing mill spindle flat head sleeve, and determining alloy powder for repair according to the analysis result; s5: preheating a main shaft flat head sleeve of a roughing mill; s6, adjusting the working parameters of the laser, starting the laser to emit a laser beam with high energy density, fusing the repaired alloy powder and the surface of the base material of the main shaft flat head sleeve of the roughing mill together, and forming a cladding layer at the damaged part; and S7, heat preservation treatment. The cladding layer repaired by the method has higher hardness than that of the parent metal, fine crystal grains and compact structure, has good cavitation resistance and thermal stability, strong bonding force with the parent metal, difficult chipping and shedding and good wear resistance, and can completely meet the use requirement after being repaired.
Description
Technical Field
The invention relates to the technical field of maintenance of roughing mill equipment, in particular to a method for repairing a worn main shaft flat head sleeve of a roughing mill.
Background
The roughing mill is used in the steel industry and adopts a universal shaft connection mode, and the cross universal shaft has the advantages of being large in bearing capacity, long in service life, ultrahigh in transmission efficiency, large in axis inclination angle, stable in operation, convenient to maintain and the like. However, the flat head sleeve is easily crushed, worn and even broken due to the impact, vibration and other actions in the using process. The flat head sleeve of the main shaft of the roughing mill at home and abroad is mostly made of medium carbon CrMo steel and other materials integrally, and then the hardness requirement of 45-50HRC is met by surface nitriding and other treatment means, so the manufacturing cost of the flat head sleeve of the main shaft of the roughing mill is very high, the flat head sleeve after abrasion failure is difficult to repair due to great difficulty, the use requirement is difficult to meet even if the flat head sleeve is repaired by a traditional method, the abraded flat head sleeve is generally scrapped at present, and great waste is caused.
Disclosure of Invention
Technical problem to be solved
In order to solve the problems in the prior art, the invention provides a method for repairing a worn rough mill spindle nose sleeve, which adopts a laser cladding method to repair the worn rough mill spindle nose sleeve so that the repaired rough mill spindle nose sleeve has good wear resistance, and has the advantages of few cracks of a repair layer and high fusion rate of the cladding layer and a base material (of the rough mill spindle nose sleeve).
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
a method for repairing a worn rough mill spindle flat head sleeve by adopting a laser cladding method comprises the following steps:
s1, determining the damaged part and the abrasion loss of the spindle flat head sleeve of the roughing mill;
s2, carrying out metallographic detection on the roughing mill spindle lug sleeve;
s3, cleaning a fatigue layer at the damaged part of the spindle flat head sleeve of the roughing mill until a fresh metal surface is exposed;
s4: analyzing the chemical components of the roughing mill spindle flat head sleeve, determining alloy powder for repairing according to the analysis result, and filling the alloy powder into a feeder of a laser;
s5: preheating a main shaft flat head sleeve of a roughing mill;
s6, adjusting the working parameters of the laser, starting the laser to emit a laser beam with high energy density, fusing the repaired alloy powder and the surface of the base material of the spindle flat head sleeve of the roughing mill together, and forming a cladding layer at the damaged part of the spindle flat head sleeve of the roughing mill;
s7, heat preservation treatment, wherein the temperature is 150 ℃ and 200 ℃, and the heat preservation is carried out for 6-8 h.
Preferably, in step S1, the damaged portion and the amount of wear are determined by cleaning the roughing mill spindle sleeve and accurately measuring the surface dimensions. Wherein, after cleaning, further clean up dust, incrustation scale, corrosion of the roughing mill main shaft flat head cover.
Preferably, in step S3, the fatigue layer for cleaning the damaged part of the spindle lug sleeve of the roughing mill is 0.5-1mm thick.
Preferably, in step S4, the repair alloy powder includes 5wt% Cu, 3.5wt% Si, 1.5wt% B, 27.0wt% Cr, 60wt% Ni, and 3wt% Fe; alternatively, the repair alloy powder contains 5wt% Cu, 3.5wt% Si, 1.5wt% B, 27.0wt% Cr, 58wt% Ni, 3wt% Fe, and 2 wt% other elements.
Preferably, in step S5, the roughing mill spindle nose sleeve is preheated to 150-. The base material is preheated, so that the cladding layer and the base material can be fused into a whole as much as possible, and the surface of the cladding layer and the surface of the base material after cladding are prevented from generating reheating cracks.
Preferably, in step S6, the operating parameters of the laser are adjusted, and the operating parameters of the laser include power, spot diameter, overlap ratio and scanning speed. Preferably, the power of the laser is adjusted to be 1kw, the diameter of a light spot is 2mm, the lap ratio is 20-40%, and the scanning speed is 16-18 mm/s.
According to production experience, when the diameter of the light spot is 2mm, the cladding effect is optimal, and the rest data can be fixed according to the laser. Preferably, the power of the laser is adjusted to be 1kw, the lapping rate is 40%, and the scanning speed is 16 mm/s.
Preferably, the holding temperature of step S7 is 180 ℃ and the holding time is 6h or 7 h. The heat preservation treatment can improve the metallographic structure performance of the roughing mill spindle flat head sleeve after cladding and eliminate the residual stress after cladding. For the spindle flat head sleeve of the roughing mill, the material can only enable the structure performance to reach the optimal state within the temperature range.
Preferably, between the steps S6-S7, a machining processing step S67 is further included: and (4) machining the repaired part of the welding roughing mill spindle flat head sleeve to restore the repaired part to the original design parameters.
Preferably, after step S7, a repairing effect detecting step is further included: and performing dye penetrant inspection and ultrasonic inspection on the repaired surface of the spindle flat head sleeve of the roughing mill to evaluate the repairing effect.
Preferably, after step S7, the method further comprises a hardness detection step: and (4) detecting the hardness of the repaired part of the roughing mill spindle flat head sleeve, and comparing the detected hardness with the hardness of the roughing mill spindle flat head sleeve base metal to evaluate the repairing effect.
(III) advantageous effects
The invention has the beneficial effects that:
compared with the prior art, the repair method comprises the steps of firstly analyzing the roughing mill spindle flat head sleeve (metallographic detection and chemical component analysis), determining alloy powder repaired by laser cladding, adjusting working parameters of a laser according to the alloy powder, and completing repair of the roughing mill spindle flat head sleeve by using a laser cladding technology. The repaired rough mill spindle flat head sleeve has the advantages that the hardness of the cladding layer is higher than 45HRC of the base metal, the texture of the cladding layer is compact, the crystal grains are fine, the corrosion resistance and the thermal stability are good, the strength is high, the bonding force between the cladding layer and the base metal is strong, the block is not easy to fall off and fall off, the wear resistance is good, the high-temperature deformation is small, the phenomena of block falling off and falling off cannot be generated in use, and the service life is long. After being repaired, the steel plate is installed on a roughing mill for actual production and use, and the original use requirement is completely met through verification.
Drawings
FIG. 1 is a flow chart of a method for repairing a flat head sleeve of a main shaft of a roughing mill after the flat head sleeve is worn.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
Referring to fig. 1, the method for repairing a worn spindle nose sleeve of a roughing mill basically comprises four major parts, namely preparation before repair, laser cladding repair, heat preservation after repair, detection after repair and effect evaluation, and specifically comprises the following steps:
a first part: preparation before repair
(1) Cleaning the roughing mill main shaft flat head sleeve, cleaning dust, scale and rust of the roughing mill main shaft flat head sleeve, detecting the size of a repaired part, and determining a damaged part and the abrasion loss of the damaged part;
(2) performing metallographic detection on the roughing mill spindle flat head sleeve workpiece, and performing failure analysis and service life evaluation on the workpiece by using the metallographic detection;
(3) removing a fatigue layer of 1mm at a damaged part (namely a worn part) of a flat head sleeve of a main shaft of a roughing mill by using a boring and milling machine, and cleaning the fatigue layer until a fresh metal processing surface appears;
(4) detecting the hardness and chemical components of a spindle flat head sleeve of a roughing mill, determining alloy powder for repair, calculating the required amount of the alloy powder for repair by combining a damaged part and a wear amount, floating a certain proportion according to the calculated required amount to obtain the actual alloy powder amount, and filling the actual alloy powder amount into a feeder matched with a laser;
in general, the alloy powder used for repairing the head sleeve of the spindle of the roughing mill comprises 5wt% of Cu, 3.5wt% of Si, 1.5wt% of B, 27.0wt% of Cr, 60wt% of Ni and 3wt% of Fe; or 5wt% Cu, 3.5wt% Si, 1.5wt% B, 27.0wt% Cr, 58wt% Ni, 3wt% Fe and 2 wt% other elements.
(5) Preheating the main shaft flat head sleeve of the roughing mill at the temperature of 150-.
A second part: repair process
(1) And adjusting working parameters of the laser according to results of metallographic detection, hardness and chemical component detection in the first part: for example, the power of the laser is adjusted to 1kw, the spot diameter is 2mm, the overlapping ratio is 40%, and the scanning speed is 18 mm/s.
(2) And (3) starting a laser, emitting a laser beam with high energy density, melting the alloy powder output by the feeder and the thin layer on the surface of the roughing mill spindle flat head sleeve base material together and rapidly solidifying the alloy powder, cladding the alloy powder on the surface of the roughing mill spindle flat head sleeve (specifically on the fresh metal processing surface formed in the step (3) in the first part), and ensuring that the thickness of the cladding layer is about 0.5mm-1.2 mm.
And a third part: heat preservation treatment after repair
Machining the repaired part according to the original design parameters of the main shaft flat head sleeve of the roughing mill, removing the redundant materials of the cladding layer by using a boring and milling machine or a polishing method, welding the main shaft flat head sleeve of the roughing mill, performing heat preservation treatment on the main shaft flat head sleeve of the roughing mill at the temperature of 150-200 ℃, preferably 180 ℃, preserving heat for 6-8 hours, and then cooling to room temperature.
The fourth part: post-repair detection and assessment
(1) Carrying out surface coloring flaw detection and integral ultrasonic flaw detection on the machined main shaft flat head sleeve of the roughing mill, and evaluating the repairing effect;
(2) the hardness of the repaired rough mill main shaft flat head sleeve is detected, the roughness of the surface of the repaired part is detected, and compared with the related parameters of the original new rough mill main shaft flat head sleeve,
and evaluating the repairing effect.
Application examples
A laser cladding method for cavitation and abrasion of a flat head sleeve of a main shaft of a roughing mill in a certain steel plant is carried out according to the following processes:
preparation before repair: cleaning and drying a main shaft flat head sleeve of a roughing mill to be repaired, then detecting the sizes of all parts, and determining the damaged part and the abrasion loss of the damaged part; performing metallographic detection on the main shaft flat head sleeve of the roughing mill, and performing failure analysis and service life evaluation according to the metallographic detection; removing the fatigue layer of the damaged part by 1mm by using a boring and milling machine until a new processing surface is exposed; and detecting the material and the hardness of the parent metal, and determining that the material is 43CrMo and the hardness is 45 HRC.
Repairing: selecting iron-nickel-based alloy powder as repair alloy powder, which comprises the following components: containing 5wt% of Cu, 3.5wt% of Si, 1.5wt% of B, 27.0wt% of Cr, 58wt% of Ni, 3wt% of Fe and 2 wt% of other elements (trace elements such as manganese, copper and niobium), and mixing and loading the powders into a feeder of a laser cladding device. The power of the laser is adjusted to be 1kw, the diameter of a light spot is 2mm, the lap joint rate is 40%, and the scanning speed is 18 mm/s. And starting a laser, melting and coating the alloy powder output by the feeder on the damaged part of the roughing mill spindle flat head sleeve, and fusing the alloy powder and the surface of the base material of the roughing mill spindle flat head sleeve into a whole to form a cladding layer with the thickness of 0.5 mm.
And (3) repairing and post-treating: carrying out heat preservation treatment on the roughing mill spindle flat head sleeve, wherein the treatment process comprises the following steps: keeping the temperature at 180 ℃, keeping the temperature for 7h, then cooling to room temperature, and keeping the original flat head sleeve of the main shaft of the roughing mill
Designing a drawing, and machining the main shaft flat head sleeve of the roughing mill, such as boring and milling, grinding and the like.
And (3) detection of a repairing effect: and performing dye penetrant inspection and ultrasonic inspection on the surface of the repaired main shaft flat head sleeve of the roughing mill, detecting the defect-free main shaft flat head sleeve of the roughing mill, performing hardness detection and metallographic analysis on the repaired surface, and checking whether the repair quality is qualified.
The detection result proves that:
the repaired rough mill spindle flat head sleeve has the advantages that the hardness of a cladding layer is higher than 45HRC of a base metal, the cladding layer is compact in structure and fine in crystal grain, has good cavitation resistance and thermal stability, is high in strength, strong in binding force between the cladding layer and the base metal, is not prone to chipping and falling, is good in wear resistance and small in high-temperature deformation, and cannot generate chipping and falling in use. After being repaired, the steel plate is installed on a roughing mill for actual production and use, and the original use requirement is completely met through verification.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (8)
1. A method for repairing a flat head sleeve of a main shaft of a roughing mill after being worn comprises the following steps:
s1, determining the damaged part and the abrasion loss of the spindle flat head sleeve of the roughing mill;
s2, carrying out metallographic detection on the roughing mill spindle lug sleeve;
s3, cleaning a fatigue layer at the damaged part of the spindle flat head sleeve of the roughing mill until a fresh metal surface is exposed;
s4: analyzing the chemical components of the roughing mill spindle flat head sleeve, determining alloy powder for repairing according to the analysis result, and filling the alloy powder into a feeder of a laser;
the material of the roughing mill main shaft flat head sleeve is 43 CrMo;
the repair alloy powder is composed of 5wt% of Cu, 3.5wt% of Si, 1.5wt% of B, 27.0wt% of Cr, 60wt% of Ni and 3wt% of Fe; alternatively, the repair alloy powder is composed of 5wt% Cu, 3.5wt% Si, 1.5wt% B, 27.0wt% Cr, 58wt% Ni, 3wt% Fe, and 2 wt% other elements;
s5: preheating a main shaft flat head sleeve of a roughing mill to 150-200 ℃;
s6, adjusting the working parameters of the laser, starting the laser to emit a laser beam with high energy density, fusing the repaired alloy powder and the surface of the base material of the spindle flat head sleeve of the roughing mill together, and forming a cladding layer at the damaged part of the spindle flat head sleeve of the roughing mill;
s7, heat preservation treatment, wherein the temperature is 150 ℃ and 200 ℃, and the heat preservation is carried out for 6-8 h.
2. The repairing method according to claim 1, wherein in step S1, the damaged portion and the amount of wear are determined by cleaning the roughing mill spindle lug boss and accurately measuring the surface dimensions.
3. The repairing method according to claim 1, wherein in step S3, the thickness of the fatigue layer in the damaged portion of the thimble sleeve of the main shaft of the roughing mill is 0.5 to 1 mm.
4. The repairing method according to claim 1, wherein in step S6, the laser is adjusted to have a power of 1kw, a spot diameter of 2mm, an overlap ratio of 20-40%, and a scanning speed of 16-18 mm/S.
5. The repair method according to claim 1, wherein the holding temperature of step S7 is 180 ℃ and the holding time is 6 hours or 7 hours.
6. Repair method according to claim 1, characterized in that, between steps S6-S7, it further comprises machining treatment steps S67: and (4) machining the repaired part of the welding roughing mill spindle flat head sleeve to restore the repaired part to the original design parameters.
7. The repairing method according to claim 1, further comprising, after the step S7, a repairing effect detecting step of: performing dye penetrant inspection and ultrasonic inspection on the repaired surface of the main shaft flat head sleeve of the roughing mill to evaluate the repairing effect; and/or
After step S7, a hardness detection step is further included: and (4) detecting the hardness of the repaired part of the roughing mill spindle flat head sleeve, and comparing the detected hardness with the hardness of the roughing mill spindle flat head sleeve base metal to evaluate the repairing effect.
8. A roughing mill spindle nose sleeve characterized in that the worn roughing mill spindle nose sleeve is repaired according to the repairing method of any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811135002.6A CN109267060B (en) | 2018-09-28 | 2018-09-28 | Method for repairing worn spindle flat head sleeve of roughing mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811135002.6A CN109267060B (en) | 2018-09-28 | 2018-09-28 | Method for repairing worn spindle flat head sleeve of roughing mill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109267060A CN109267060A (en) | 2019-01-25 |
| CN109267060B true CN109267060B (en) | 2021-11-19 |
Family
ID=65197925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811135002.6A Active CN109267060B (en) | 2018-09-28 | 2018-09-28 | Method for repairing worn spindle flat head sleeve of roughing mill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109267060B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113249723B (en) * | 2021-06-28 | 2021-11-30 | 成都飞机工业（集团）有限责任公司 | CMT arc surface cladding method based on database system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60106691A (en) * | 1983-11-15 | 1985-06-12 | Hitachi Metals Ltd | Alloy for brazing |
| EP1029629A2 (en) * | 1999-02-17 | 2000-08-23 | EUROMAT Gesellschaft für Werkstofftechnologie und Transfer mbH | Process for applying a protective coating on the surface of workpieces; alloy and solder used therefor |
| CN101381867A (en) * | 2007-09-05 | 2009-03-11 | 上海宝钢设备检修有限公司 | Laser remelted alloy powder for repairing surface of high-carbon alloy steel workpieces and method for making same |
| JP2009056511A (en) * | 2007-08-31 | 2009-03-19 | General Electric Co <Ge> | Method of repairing nickel-based alloy article |
| CN102002707A (en) * | 2010-11-25 | 2011-04-06 | 秦皇岛洪川实业有限公司 | Laser repairing method of damaged finishing roller |
| CN102719708A (en) * | 2012-07-12 | 2012-10-10 | 丹阳市协昌合金有限公司 | Laser-cladding high-toughness high-hardness nickel-base alloy powder and preparation method thereof |
-
2018
- 2018-09-28 CN CN201811135002.6A patent/CN109267060B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60106691A (en) * | 1983-11-15 | 1985-06-12 | Hitachi Metals Ltd | Alloy for brazing |
| EP1029629A2 (en) * | 1999-02-17 | 2000-08-23 | EUROMAT Gesellschaft für Werkstofftechnologie und Transfer mbH | Process for applying a protective coating on the surface of workpieces; alloy and solder used therefor |
| JP2009056511A (en) * | 2007-08-31 | 2009-03-19 | General Electric Co <Ge> | Method of repairing nickel-based alloy article |
| CN101381867A (en) * | 2007-09-05 | 2009-03-11 | 上海宝钢设备检修有限公司 | Laser remelted alloy powder for repairing surface of high-carbon alloy steel workpieces and method for making same |
| CN102002707A (en) * | 2010-11-25 | 2011-04-06 | 秦皇岛洪川实业有限公司 | Laser repairing method of damaged finishing roller |
| CN102719708A (en) * | 2012-07-12 | 2012-10-10 | 丹阳市协昌合金有限公司 | Laser-cladding high-toughness high-hardness nickel-base alloy powder and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 粗轧机主轴扁头套内孔修复技术探讨与应用;谢明;《重型机械》;20170320;第2卷(第336期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109267060A (en) | 2019-01-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104532233B (en) | Rotor axle position laser melting coating restorative procedure | |
| CN102031519B (en) | Laser repair method for abraded centrifugal fan bearing block | |
| CN102732831B (en) | Laser repairing process for automobile mold | |
| CN104801919A (en) | Repairing method for bearing seat | |
| CN110273155A (en) | A kind of laser cladding reconstructing technique | |
| CN111139465A (en) | Manufacturing method for manufacturing composite steel pipe by laser | |
| CN111074266A (en) | Rapid forming and repairing method for damage of airplane electromagnetic pure iron part accessory | |
| CN110052610A (en) | A kind of increasing material manufacturing method of grain roll | |
| CN111020563A (en) | Remanufacturing method for direct laser cladding of failure carburized and quenched part | |
| CN109252157A (en) | A kind of restorative procedure after H profile steel roll axle end wear | |
| CN109267060B (en) | Method for repairing worn spindle flat head sleeve of roughing mill | |
| CN107675168A (en) | Laser melting coating restorative procedure after steam circulation pump seal surface wear | |
| CN110747462A (en) | High-speed laser cladding process | |
| CN109108269A (en) | Locomotive wheel reparation iron(-)base powder and laser 3D printing renovation technique | |
| CN104148874B (en) | Manual arc welding restorative procedure after the wearing and tearing of universal rolling mill vertical roll axle box bearing seat | |
| CN112210774A (en) | Laser cladding repair method for machine tool failure gear | |
| CN112226756A (en) | Machine tool spindle remanufacturing method based on laser cladding | |
| CN112981389A (en) | Laser repair method for propeller shaft | |
| CN108165983B (en) | Laser repairing method for mobile cross head | |
| CN115070061A (en) | Laser repairing method for undercarriage cracks | |
| CN103668181B (en) | The laser repairing process of the automobile die that fusion rate is high | |
| CN103668180A (en) | Laser repair process for automobile mould combining closely with mould wearing parts | |
| CN115945860B (en) | Remanufacturing technology process for torsion shaft surface of vehicle | |
| CN106567065A (en) | Laser repairing method for allowing roller surface of hot roller to have good thermal hardness after repairing | |
| CN113042738B (en) | Pump cover plate material-adding repairing method and system for circulating water filtering system |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |