CN110643923A - Method for repairing cylinder block by using spraying process - Google Patents
Method for repairing cylinder block by using spraying process Download PDFInfo
- Publication number
- CN110643923A CN110643923A CN201910884548.XA CN201910884548A CN110643923A CN 110643923 A CN110643923 A CN 110643923A CN 201910884548 A CN201910884548 A CN 201910884548A CN 110643923 A CN110643923 A CN 110643923A
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- China
- Prior art keywords
- cylinder block
- coating
- inner hole
- cylinder
- repairing
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- 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.)
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Classifications
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- 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/134—Plasma spraying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
- B23P6/02—Pistons or cylinders
-
- 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
Abstract
The invention discloses a method for repairing a cylinder block by using a spraying process, which comprises the steps of recovering an old cylinder block, cleaning the surface of the old cylinder block, and boring an inner hole of the cylinder block; performing finish machining on the inner hole bored in the step S1; spraying alloy powder on the surface of the inner hole of the cylinder block by using a spraying process to form a coating; the coating layer formed in step S3 is subjected to finishing treatment. The invention has the beneficial effects that: the roundness and cylindricity of the inner hole of the cylinder body can be corrected through the boring hole, the uniform coating can be formed conveniently in the follow-up process, the size of abrasion can be repaired through the spraying coating, the size of the inner hole of the cylinder body is recovered to the qualified finished product size, the purpose of recycling the waste cylinder body is achieved, the service life of the cylinder body is prolonged, and the resource waste is reduced.
Description
Technical Field
The invention relates to the technical field of spraying, in particular to a method for repairing a cylinder block by using a spraying process.
Background
The cylinder of the internal combustion engine is a place where a mixed gas of fuel and air is combusted and expanded, and the inner surface of the cylinder directly contacts with high-temperature and high-pressure gas and guides the piston to reciprocate at a high speed during operation, so that the cylinder of the internal combustion engine has the characteristics of sufficient strength and rigidity, wear resistance, high temperature resistance, corrosion resistance and the like. Meanwhile, the inner wall of the cylinder is required to have certain machining precision and surface smoothness, and the sealing and oil storage effects can be guaranteed when the cylinder is matched with the piston. Because the cylinder works for a long time under the severe conditions of high temperature, high pressure and poor lubrication, and the piston ring reciprocate in the cylinder at a high speed, the abrasion is inevitable. After the internal combustion engine works for a long time, the unbalanced wear condition of the cylinder has two types: one is that the cylinder is conical due to uneven wear along the motion direction of the piston; the other is that the wear in the direction perpendicular to the motion direction of the piston is uneven and elliptical, so that the air tightness of the cylinder body is insufficient, and the power output and the fuel efficiency of the internal combustion engine are influenced.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method for repairing a cylinder block by using a plasma spraying process, which is used for repairing and remanufacturing a worn cylinder of an internal combustion engine, recovering the performance and the quality of the cylinder, prolonging the service life of the internal combustion engine, reducing the resource waste and reducing the resource loss.
The technical scheme adopted by the invention for solving the problems is as follows: a method for repairing a cylinder block using a plasma spray process, comprising the steps of:
step S1: recovering the old cylinder block, cleaning the surface of the old cylinder block, and boring the inner hole of the cylinder block;
step S2: performing finish machining on the inner hole bored in the step S1;
step S3: spraying alloy powder on the surface of the inner hole of the cylinder block by using a spraying process to form a coating;
step S4: the coating layer formed in step S3 is subjected to finishing treatment.
Further, in order to better implement the present invention, in step S1, the diameter size of the bore of the cylinder block after boring is D + X, where D is the finished diameter size of the cylinder block bore, and X is the increment of the diameter size of the cylinder block bore; the thickness of the coating after finishing treatment in the step S4 is less than or equal to one half of X.
Furthermore, in order to better realize the invention, the size of X is 0.2-0.4 mm; in the step S3, the thickness of the coating is 200-400 μm; in step S4, the thickness of the finish-processed coating is 100 to 150 μm.
Further, in order to better implement the present invention, in step S2, the inner hole is subjected to a finishing process by using a sand blasting process.
Furthermore, in order to better realize the invention, the sand blasting grains used in the sand blasting process comprise 60-70% of coarse sand and 30-40% of fine sand by mass ratio, the granularity of the coarse sand is 20-36 meshes, and the granularity of the fine sand is 36-60 meshes.
Further, in order to better implement the present invention, in step S4, the finish processing is performed on the coating layer by honing.
The beneficial effect that this scheme obtained is:
(1) according to the scheme, the roundness and cylindricity of the inner hole of the cylinder body can be corrected through boring, so that a uniform coating can be formed in the subsequent process, the worn size can be repaired through spraying the coating, the size of the inner hole of the cylinder body is recovered to the qualified size of a finished product, the purpose of recycling the waste cylinder body is achieved, the service life of the cylinder body is prolonged, and the resource waste is reduced;
(2) the coating is formed by using a spraying mode, so that the coating has the advantages of small material loss, simple and convenient process, low construction cost and the like, the strength of the inner surface of the cylinder body can be improved by selecting proper alloy powder, the wear resistance of the inner surface of the cylinder body is enhanced, and the service life of the cylinder body is prolonged.
Drawings
FIG. 1 is a schematic process flow diagram of the present embodiment;
FIG. 2 is a schematic view of a spray coating process.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited to these examples.
Example 1:
as shown in fig. 1, in the present embodiment, a method for repairing a cylinder block by using a spray coating process includes the following steps:
step S1: and recovering the old cylinder block, cleaning the surface of the old cylinder block, and boring the inner hole of the cylinder block. The cylinder block inner hole which is abraded into the conical shape or the elliptical shape can be corrected into the cylindrical shape through the boring hole, so that a uniform coating can be formed in the later spraying process, the strength and the hardness of all parts of the inner surface of the cylinder block can be kept consistent, the pressure and the abrasion loss of all parts of the cylinder block inner hole in working can be kept the same, and the deformation caused by unbalanced abrasion after the cylinder block is repaired can be reduced.
Step S2: the finish machining process is performed on the bore bored in step S1, which is advantageous in increasing the joining strength of the cylinder block and the coating layer and preventing the coating layer from being stuck loosely or falling off. In this embodiment, the inner hole is subjected to finish machining by a sand blasting process. The sand blasting process can enable the surface of the inner wall of the cylinder hole to form a uniform rugged rough surface, can increase the contact area of the coating and the inner wall of the cylinder hole, and enables the sprayed coating and the inner wall of the cylinder hole to form good combination.
As shown in fig. 2, step S3: alloy powder is sprayed on the surface of the inner hole of the cylinder block by a spraying process to form a coating, the sprayed powder and working gas are continuously conveyed, the working gas burns and melts the sprayed powder, and the melted sprayed powder is sprayed on the inner surface of the inner hole of the cylinder block under the action of thrust generated by the combustion of the working gas to form the coating. In this embodiment, the alloy powder can select iron-based alloy powder, and compared with an aluminum alloy cylinder block, the coating formed by the iron-based alloy powder has higher hardness and stronger wear resistance, and the coating formed by the iron-based alloy powder can increase the surface strength of the inner hole of the cylinder block, so that the wear resistance of the cylinder block is enhanced, and the service life of the cylinder block is prolonged.
The worn and bored diameter size of the inner bore of the cylinder block can be repaired by utilizing a coating with a certain thickness, so that the diameter size of the inner bore of the cylinder block is repaired to the size required by a finished product.
Step S4: the precision of the surface of the sprayed coating is poor, the finish machining treatment is carried out on the coating formed in the step S3, the hole diameter of the inner hole of the cylinder block is adjusted through finish machining so as to meet the use requirement, the surface precision of the inner hole of the cylinder block can be improved, and the abrasion is reduced in the subsequent use process.
Example 2:
on the basis of the above embodiment, in this embodiment, in step S1, the diameter size of the bore of the cylinder block after boring is D + X, where D is the finished diameter size of the cylinder block bore, and X is the increment of the cylinder block bore diameter size; the thickness of the coating after finishing treatment in the step S4 is less than or equal to one half of X. Therefore, the diameter of the inner hole of the cylinder body can meet the design requirement of a finished product after finishing the finish machining of the coating.
In the embodiment, the size of X is 0.2-0.4 mm; in the step S3, the thickness of the coating is 200-400 μm; in step S4, the thickness of the finish-processed coating is 100 to 150 μm.
Example 3:
on the basis of the above embodiment, in this embodiment, the cylinder bore of the cylinder block with the bore diameter of 70mm is repaired by the following specific steps:
step S1: cleaning, drying and inspecting the waste internal combustion engine; carrying out boring treatment on the cast aluminum cylinder liner-free internal combustion engine subjected to bench inspection until the size is 70.3mm and the cylindricity of a cylinder hole is 15 mu m; the roughness Ra is less than or equal to 3.2.
Step S2: carrying out sand blasting treatment on the inner wall of the cylinder body after boring, and selecting white corundum sand as a sand material, wherein the mass ratio of coarse sand is 60%, the granularity is 20 meshes, the mass ratio of fine sand is 40%, and the granularity is 40 meshes; the rotation speed of the sand blasting gun: 50 rpm; moving speed of the sand blasting gun: 8mm/s, 3 times of sand blasting operation.
Step S3: feeding the sieved and dried spray-coated iron-based powder with the particle size of 10-50 mu m into a powder feeder, wherein the powder feeding speed is 120g/min, and the argon flow is 50L/min; the hydrogen flow is 8L/min; the current is 400A, and the spraying distance is 35 mm; the plasma gun rotation speed was 200 rpm. The whole spraying operation was carried out 10 times with a coating thickness of 300. mu.m.
Step S4: and assembling the sprayed cylinder block of the internal combustion engine to a honing machine for honing, wherein the rotation speed of the honing head is 80rpm, and the reciprocating speed is 15 mm/s. The roughness of the inner wall of the cylinder block after honing is 0.1< Ra <0.5, Rz <5, and the diameter of the cylinder hole is 70 mm.
And finishing the repair of the cylinder block of the internal combustion engine after honing.
Example 4:
on the basis of the above embodiment, in this embodiment, the cylinder bore of the cylinder block with the bore diameter of 86mm in the cylinder bore is repaired by the following specific steps:
step S1: cleaning, drying and inspecting the waste internal combustion engine; carrying out boring treatment on the cast aluminum cylinder liner-free internal combustion engine subjected to bench inspection until the size is 86.3mm and the cylindricity of a cylinder hole is 12 mu m; the roughness Ra is less than or equal to 3.2.
Step S2: carrying out sand blasting treatment on the inner wall of the cylinder body after boring, and selecting white corundum sand as a sand material, wherein the mass ratio of coarse sand is 80%, the granularity is 20 meshes, the mass ratio of fine sand is 20%, and the granularity is 40 meshes; the rotation speed of the sand blasting gun: 60 rpm; moving speed of the sand blasting gun: 10mm/s, 3 times of sand blasting operation.
Step S3: feeding the sieved and dried spray-coated iron-based powder with the particle size of 10-50 mu m into a powder feeder, wherein the powder feeding speed is 100g/min, and the argon flow is 45L/min; the hydrogen flow is 6L/min; the current is 450A, and the spraying distance is 43 mm; the plasma gun rotation speed was 60 rpm. The whole spraying operation was carried out 12 times with a coating thickness of 320. mu.m.
Step S4: and assembling the sprayed cylinder block of the internal combustion engine to a honing machine for honing, wherein the rotation speed of the honing head is 100rpm, and the reciprocating speed is 15 mm/s. The roughness of the inner wall of the cylinder block after honing is 0.1< Ra <0.5, Rz <5, and the diameter of the cylinder hole is 86 mm.
And finishing the repair of the cylinder block of the internal combustion engine after honing.
In this embodiment, other undescribed contents are the same as those in the above embodiment, and thus are not described again.
The foregoing is only a preferred embodiment of the present invention, and the present invention is not limited thereto in any way, and any simple modification, equivalent replacement and improvement made to the above embodiment within the spirit and principle of the present invention still fall within the protection scope of the present invention.
Claims (6)
1. A method for repairing a cylinder block by using a spraying process is characterized in that: the method comprises the following steps:
step S1: recovering the old cylinder block, cleaning the surface of the old cylinder block, and boring the inner hole of the cylinder block;
step S2: performing finish machining on the inner hole bored in the step S1;
step S3: spraying alloy powder on the surface of the inner hole of the cylinder block by using a spraying process to form a coating;
step S4: the coating layer formed in step S3 is subjected to finishing treatment.
2. The method of repairing a cylinder block using a spray coating process according to claim 1, wherein: in the step S1, the diameter of the bored inner bore of the cylinder block is D + X, where D is the finished diameter of the inner bore of the cylinder block and X is the increment of the diameter of the inner bore of the cylinder block; the thickness of the coating after finishing treatment in the step S4 is less than or equal to one half of X.
3. The method of repairing a cylinder block using a spray coating process according to claim 2, wherein: the size of X is 0.2-0.4 mm; in the step S3, the thickness of the coating is 200-400 μm; in step S4, the thickness of the finish-processed coating is 100 to 150 μm.
4. The method of repairing a cylinder block using a spray coating process according to claim 1, wherein: in step S2, the inner hole is subjected to a finishing process by a sand blasting process.
5. The method of repairing a cylinder block using a spray coating process according to claim 4, wherein: the sand blasting grains used in the sand blasting process comprise 60-70% of coarse sand and 30-40% of fine sand by mass ratio, the granularity of the coarse sand is 20-36 meshes, and the granularity of the fine sand is 36-60 meshes.
6. The method of repairing a cylinder block using a spray coating process according to claim 1, wherein: in step S4, the finish processing is performed on the coating by honing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910884548.XA CN110643923A (en) | 2019-09-19 | 2019-09-19 | Method for repairing cylinder block by using spraying process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910884548.XA CN110643923A (en) | 2019-09-19 | 2019-09-19 | Method for repairing cylinder block by using spraying process |
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| CN110643923A true CN110643923A (en) | 2020-01-03 |
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| CN201910884548.XA Pending CN110643923A (en) | 2019-09-19 | 2019-09-19 | Method for repairing cylinder block by using spraying process |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103132009A (en) * | 2011-11-22 | 2013-06-05 | 福特全球技术公司 | Process for repairing a cylinder running surface by means of plasma spraying processes |
| CN106078077A (en) * | 2016-08-25 | 2016-11-09 | 张家港清研再制造产业研究院有限公司 | A kind of engine cylinder hole restorative procedure |
| CN106947933A (en) * | 2017-04-21 | 2017-07-14 | 张家港清研再制造产业研究院有限公司 | A kind of restorative procedure of engine cylinder-body spindle hole |
| CN107030447A (en) * | 2017-04-21 | 2017-08-11 | 张家港清研再制造产业研究院有限公司 | A kind of engine cylinder hole restorative procedure |
| CN109112459A (en) * | 2018-07-28 | 2019-01-01 | 国营芜湖机械厂 | A kind of aircraft universal shaft remanufactures renovation technique |
-
2019
- 2019-09-19 CN CN201910884548.XA patent/CN110643923A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103132009A (en) * | 2011-11-22 | 2013-06-05 | 福特全球技术公司 | Process for repairing a cylinder running surface by means of plasma spraying processes |
| CN106078077A (en) * | 2016-08-25 | 2016-11-09 | 张家港清研再制造产业研究院有限公司 | A kind of engine cylinder hole restorative procedure |
| CN106947933A (en) * | 2017-04-21 | 2017-07-14 | 张家港清研再制造产业研究院有限公司 | A kind of restorative procedure of engine cylinder-body spindle hole |
| CN107030447A (en) * | 2017-04-21 | 2017-08-11 | 张家港清研再制造产业研究院有限公司 | A kind of engine cylinder hole restorative procedure |
| CN109112459A (en) * | 2018-07-28 | 2019-01-01 | 国营芜湖机械厂 | A kind of aircraft universal shaft remanufactures renovation technique |
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Application publication date: 20200103 |
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