CN112264281A - Sand blasting protection method for machining surface of generator set - Google Patents
Sand blasting protection method for machining surface of generator set Download PDFInfo
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- CN112264281A CN112264281A CN202011171604.4A CN202011171604A CN112264281A CN 112264281 A CN112264281 A CN 112264281A CN 202011171604 A CN202011171604 A CN 202011171604A CN 112264281 A CN112264281 A CN 112264281A
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- Prior art keywords
- coating
- sand blasting
- wear
- finished
- protection
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/56—Three layers or more
- B05D7/58—No clear coat specified
- B05D7/584—No clear coat specified at least some layers being let to dry, at least partially, before applying the next layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/56—Three layers or more
- B05D7/58—No clear coat specified
- B05D7/586—No clear coat specified each layer being cured, at least partially, separately
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/04—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for treating only selected parts of a surface, e.g. for carving stone or glass
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a sand blasting protection method for a machining surface of a generator set. The sand blasting protective coating process method has excellent comprehensive physical properties, can meet the protection requirement of gas-solid two-phase high erosion abrasion of the finish machining surface in the sand blasting process, can be conveniently removed from the machining surface after protection, and has the effect of quickly recovering the original state and the precision of the machining surface. The method is simple and convenient to operate, easy to master, obvious in effect and wide in application prospect. The problem of traditional sandblast protection mode not only complex operation and protective effect are not good in the practical application in-process, often can take place to process the surface and send out the steel sand erosion destruction is solved, and manufacturing cost and cycle have been practiced thrift by a wide margin, and social and economic benefits are showing.
Description
Technical Field
The invention relates to a sand blasting protection method for a machining surface of a generator set.
Background
In the manufacturing process of part of key parts of a large pumped storage generator set, due to the large size and the special technological process requirements, the specific surface of the key parts is often required to be machined to the required size and then subjected to subsequent welding and sand blasting operation. In the sand blasting process, in order to prevent the finished surface from being eroded and damaged by steel sand, the traditional protection method adopts the methods of rubber, plywood, bolt combination, thin steel plate spot welding, adhesive tape adhesion and the like for protection. However, the protection mode is not only complicated in operation but also poor in protection effect in the actual application process. The steel grit is directly impacted at a speed of 120.7m/s under the condition that the sand blasting pressure is 0.56-0.7 MPa and the steel grit with the particle size of 1.4-1.6 mm is used, the problems of damage and steel grit rushing into the protective gap frequently occur due to the limited protective performance of the protective material, so that the machined surface is eroded and damaged, the size and the surface precision are lost, the subsequent process needs to spend longer repairing time and high repairing cost, and the original state of the machined surface cannot be completely recovered after being repaired, so that the assembling precision and the unit operation performance are influenced. The sand blasting process belongs to gas-solid two-phase erosion abrasion, the abrasion rate of the sand blasting process is several times of that of liquid-solid two-phase erosion abrasion, and common materials cannot well meet the performance requirements of the process. Therefore, the problem which is urgently solved at present is to provide a protection process method which can meet the protection requirement of high erosion abrasion of a gas phase and a solid phase of a finished surface in the sand blasting process, can be conveniently removed from the processed surface after protection, and can quickly recover the original state and the precision of the processed surface.
Disclosure of Invention
In view of the above, the present invention provides a protection method, which can not only meet the protection requirement of high erosion and abrasion of gas-solid two phases during the sand blasting process of the finished surface, but also be removed from the processed surface more conveniently after protection, and quickly recover the original state and precision of the processed surface. The method not only can meet the protection performance requirements of high-speed impact and high abrasion of the steel grit in the sand blasting process, but also can achieve the effect of easily removing the steel grit from the processed surface after protection.
The invention provides a sand blasting protection method for a machining surface of a generator set, which comprises the following process steps:
step 1: pretreating the processed surface, cleaning and wiping the processed surface by using an organic cleaning solvent, removing pollutants such as surface oil stain, cutting oil, dust, impurities and the like, and finally wiping and checking whether the surface is cleaned up by using white cotton cloth, and if the surface is not cleaned up, cleaning again;
step 2: after the step 1) is finished, carrying out construction operation on the single-component polystyrene flexible coating on the processed surface in a spraying or roller coating mode, wherein the thickness of a dry film of the coating is 50-100 micrometers, the operation temperature is 5-30 ℃, and the ambient humidity is less than or equal to 75%;
and step 3: after the step 2) is finished, after 1 hour of the single-component polystyrene flexible coating is volatilized to form a film and is dried, coating the single-component polystyrene flexible coating for the second time, wherein the thickness of the single-component polystyrene flexible coating is 100-200 micrometers, the operating temperature is 5-30 ℃, and the ambient humidity is less than or equal to 75%;
and 4, step 4: after the step 3) is finished, waiting for 10-12 hours until the organic solvent in the single-component polystyrene flexible coating is completely volatilized to form a film, and then performing construction operation on the particle-reinforced amino polyether wear-resistant elastomer coating in a roller coating mode, wherein the operation process comprises the following steps: firstly, adding 50% by mass of 60-mesh boron carbide and 2% by mass of titanate coupling agent into an amino polyether elastomer coating, then carrying out high-speed stirring operation at 1200 rpm for 20 minutes, and after uniformly stirring, carrying out coating operation in a roller coating mode, wherein the thickness of a dry film of a first particle reinforced amino polyether wear-resistant elastomer coating is required to be 1000 microns, the operation temperature is controlled to be 5-35 ℃, and the maximum environmental humidity is less than 75%;
and 5: after the step 4) is finished, waiting for 6 hours, and then performing coating operation of the second amino polyether wear-resistant elastomer coating according to the requirements of the step 4), wherein the thickness of a dry film for the second amino polyether wear-resistant elastomer coating construction is 1000 micrometers, the construction temperature is controlled at 5-35 ℃, and the maximum environmental humidity is less than 75%;
step 6: after the step 5) is finished, waiting for 72 hours, and carrying out sand blasting operation on the parts after the amino polyether wear-resistant elastomer coating is completely cured.
Technical effects
In the sand blasting process of key parts of a large pumped storage generator set, the traditional protection mode adopted by the processing surface is complex to operate and poor in protection effect in the practical application process, and the problem that the processing surface is eroded and damaged by steel sand often occurs. The single-component polystyrene flexible coating adopted by the invention has good flexibility and environment isolation, has moderate adhesion with the processing surface, and has the peel strength of 400N/m, thereby ensuring that the whole coating has certain corrosion resistance and can be smoothly removed from the processing surface after the protection is finished; the particle-reinforced amino polyether wear-resistant elastomer coating has the advantages of high construction efficiency, environmental protection, low VOC volatilization, high wear resistance, good elastic toughness and high elongation at break, and the maximum film thickness of the coating can reach 1000 mu m after single coating.
The sandblast protection is carried out by adopting a coating mode, so that seamless joint protection for the processed surface can be realized, and the generation of gaps in the protection process is avoided, so that the steel sand rushes into the gaps in the sandblast process, and the problem of erosion damage of the processed surface is solved.
The sandblasting protective coating has excellent comprehensive physical properties: the tensile strength is more than or equal to 19.7MPa, the elongation at break is more than 300%, the coating can be stripped without fracture in a whole piece without residue when being removed, the abrasion resistance (1000g/500r) is less than or equal to 15mg, the steel grit abrasion protection requirement in the sand blasting process can be well met, the Shore hardness is more than or equal to 80HA, the impact force of the steel grit on the processing surface in the sand blasting process can be effectively absorbed, and the steel grit is prevented from hitting the processing surface to form dents. The comprehensive performance of the protective coating can well meet the protection requirements of the processing surface of the key part of the large pumped storage generator set in the sand blasting process.
And through the use of the coating protection mode, a large amount of protection auxiliary materials such as rubber, plywood, bolts, thin steel, adhesive tapes and the like and related operations can be avoided, and the production cost and the production period can be greatly saved.
The invention takes the single-component polystyrene flexible coating as the transition coating, and carries out composite construction with the particle enhanced amino polyether wear-resistant elastomer coating, thereby not only meeting the protection requirement of gas-solid two-phase high erosion abrasion of the processing surface of the key part of the large pumped storage generator set in the sand blasting process, solving a plurality of problems of the traditional protection mode, but also realizing the effect of easy removal and no residue after use. The method is simple and convenient to operate, easy to master, obvious in effect and wide in application prospect.
Drawings
FIG. 1 is a schematic flow chart of a method for protecting a machining surface of a generator set by sandblasting.
Detailed Description
As shown in fig. 1, the protection method for sandblasting a machining surface of a generator set comprises the following specific operation process methods that a single-component polystyrene flexible coating is used as a transition coating, and a particle-reinforced amino polyether wear-resistant elastomer coating is used as a surface coating:
step 1: pretreating the processed surface, cleaning and wiping the processed surface by using an organic cleaning solvent, removing pollutants such as surface oil stain, cutting oil, dust, impurities and the like, and finally wiping and checking whether the surface is cleaned up by using white cotton cloth, and if the surface is not cleaned up, cleaning again;
step 2: after the step 1) is finished, carrying out construction operation on the single-component polystyrene flexible coating on the processed surface in a spraying or roller coating mode, wherein the thickness of a dry film of the coating is 50-100 micrometers, the operation temperature is 5-30 ℃, and the ambient humidity is less than or equal to 75%; and step 3: after the step 2) is finished, after 1 hour of the single-component polystyrene flexible coating is volatilized to form a film and is dried, coating the single-component polystyrene flexible coating for the second time, wherein the thickness of the single-component polystyrene flexible coating is 100-200 micrometers, the operating temperature is 5-30 ℃, and the ambient humidity is less than or equal to 75%;
and 4, step 4: after the step 3) is finished, waiting for 10-12 hours until the organic solvent in the single-component polystyrene flexible coating is completely volatilized to form a film, and then performing construction operation on the particle-reinforced amino polyether wear-resistant elastomer coating in a roller coating mode, wherein the operation process comprises the following steps: firstly, adding 50% by mass of 60-mesh boron carbide and 2% by mass of titanate coupling agent into an amino polyether elastomer coating, then carrying out high-speed stirring operation at 1200 rpm for 20 minutes, and after uniformly stirring, carrying out coating operation in a roller coating mode, wherein the thickness of a dry film of a first particle reinforced amino polyether wear-resistant elastomer coating is required to be 1000 microns, the operation temperature is controlled to be 5-35 ℃, and the maximum environmental humidity is less than 75%;
and 5: after the step 4) is finished, waiting for 6 hours, and then performing coating operation of the second amino polyether wear-resistant elastomer coating according to the requirements of the step 4), wherein the thickness of a dry film for the second amino polyether wear-resistant elastomer coating construction is 1000 micrometers, the construction temperature is controlled at 5-35 ℃, and the maximum environmental humidity is less than 75%;
step 6: after the step 5) is finished, waiting for 72 hours, and carrying out sand blasting operation on the parts after the amino polyether wear-resistant elastomer coating is completely cured.
Finally, the scope of protection of the invention is not limited to the embodiments described above. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (1)
1. A sand blasting protection method for a machining surface of a generator set is characterized by comprising the following steps:
1) pretreating the processed surface, cleaning and wiping the processed surface by using an organic cleaning solvent, removing pollutants such as surface oil stain, cutting oil, dust, impurities and the like, and finally wiping and checking whether the surface is cleaned up by using white cotton cloth, and if the surface is not cleaned up, cleaning again;
2) after the step 1) is finished, carrying out construction operation on the single-component polystyrene flexible coating on the processed surface in a spraying or roller coating mode, wherein the thickness of a dry film of the coating is 50-100 micrometers, the operation temperature is 5-30 ℃, and the ambient humidity is less than or equal to 75%;
3) after the step 2) is finished, after 1 hour of the single-component polystyrene flexible coating is volatilized to form a film and is dried, coating the single-component polystyrene flexible coating for the second time, wherein the thickness of the single-component polystyrene flexible coating is 100-200 micrometers, the operating temperature is 5-30 ℃, and the ambient humidity is less than or equal to 75%;
4) after the step 3) is finished, waiting for 10-12 hours until the organic solvent in the single-component polystyrene flexible coating is completely volatilized to form a film, and then performing construction operation on the particle-reinforced amino polyether wear-resistant elastomer coating in a roller coating mode, wherein the operation process comprises the following steps: firstly, adding 50% by mass of 60-mesh boron carbide and 2% by mass of titanate coupling agent into an amino polyether elastomer coating, then carrying out high-speed stirring operation at 1200 rpm for 20 minutes, and after uniformly stirring, carrying out coating operation in a roller coating mode, wherein the thickness of a dry film of a first particle reinforced amino polyether wear-resistant elastomer coating is required to be 1000 microns, the operation temperature is controlled to be 5-35 ℃, and the maximum environmental humidity is less than 75%;
5) after the step 4) is finished, waiting for 6 hours, and then performing coating operation of the second amino polyether wear-resistant elastomer coating according to the requirements of the step 4), wherein the thickness of a dry film for the second amino polyether wear-resistant elastomer coating construction is 1000 micrometers, the construction temperature is controlled at 5-35 ℃, and the maximum environmental humidity is less than 75%;
6) after the step 5) is finished, waiting for 72 hours, and carrying out sand blasting operation on the parts after the amino polyether wear-resistant elastomer coating is completely cured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011171604.4A CN112264281A (en) | 2020-10-28 | 2020-10-28 | Sand blasting protection method for machining surface of generator set |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011171604.4A CN112264281A (en) | 2020-10-28 | 2020-10-28 | Sand blasting protection method for machining surface of generator set |
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| CN112264281A true CN112264281A (en) | 2021-01-26 |
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| CN202011171604.4A Pending CN112264281A (en) | 2020-10-28 | 2020-10-28 | Sand blasting protection method for machining surface of generator set |
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Application publication date: 20210126 |