CN110560290B - Engine heat-proof coating non-spraying surface protection device and coating forming method - Google Patents
Engine heat-proof coating non-spraying surface protection device and coating forming method Download PDFInfo
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- CN110560290B CN110560290B CN201910820286.0A CN201910820286A CN110560290B CN 110560290 B CN110560290 B CN 110560290B CN 201910820286 A CN201910820286 A CN 201910820286A CN 110560290 B CN110560290 B CN 110560290B
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- coating
- heat
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- engine
- proof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/16—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling the spray area
- B05B12/20—Masking elements, i.e. elements defining uncoated areas on an object to be coated
- B05B12/26—Masking elements, i.e. elements defining uncoated areas on an object to be coated for masking cavities
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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
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
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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
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/32—Processes for applying liquids or other fluent materials using means for protecting parts of a surface not to be coated, e.g. using stencils, resists
Abstract
The invention provides a protective device for a non-spraying surface of an engine heat-proof coating and a coating forming method, wherein the protective device is integrally a step cylinder made of a non-metal material, a groove or a hole is formed in the end surface of a small-diameter end, and the step cylinder can be driven to rotate around an axis by applying force at the groove or the hole; the side wall of the small-diameter section is of a thread structure, and the threads are matched with a mounting hole in the surface of the engine; after the step column body is screwed into the mounting hole on the surface of the engine, the end face of the large-diameter end is flush with or higher than the surface of the heat-proof coating. The invention can protect the non-spraying surface when the engine sprays the heat-proof paint, and can simply, conveniently and effectively assist to control the thickness of the coating in the spraying process.
Description
Technical Field
The invention relates to an engine surface protection device and a protection method.
Background
The outer heat-proof coating of the engine can play a role in heat-proof and heat-insulation protection when the engine works, and the phenomenon that the structural strength of the engine is reduced and the working safety of the engine is influenced due to overhigh temperature caused by the strong pneumatic scouring action of the outer surface of the engine is avoided. The thickness of the heat-proof coating is generally far greater than that of a paint film coating, and the spraying process of the heat-proof coating is greatly different from that of a common paint film coating and a thermal barrier coating.
The structure of a certain type of engine shell is special, a large number of mounting holes with thread structures are distributed, heat-proof paint does not need to be sprayed on the positions of the mounting holes, strict protection is needed, the heat-proof paint is prevented from polluting threads or the inner wall of the engine shell during spraying, otherwise, once the heat-proof paint is cured on the positions, the heat-proof paint is difficult to clean, and even the molded surface is possibly damaged during cleaning, so that the engine shell is scrapped. The existing spraying operation protection methods have some problems, and the difficult problem of spraying protection of the heat-proof coating of the engine shell is difficult to effectively solve:
(1) according to the prior art (invention patent CN108504974A), a silicon rubber plug is plugged into a mounting hole, because an engine shell is cylindrical, when an automatic spraying machine is used for spraying heat-proof paint, the shell must be kept to rotate at a constant speed, and along with the increase of the thickness of the coating in the spraying process, a large amount of silicon rubber plugs fall off, so that the heat-proof paint enters the mounting hole and pollutes the inner wall of the shell;
(2) the protection device is made of metal, one end of the metal protection device is processed into threads matched with the mounting hole and is tightly mounted in the hole in the shell, and when the protection device is dismounted, the individual protection device is tightly meshed with the threads of the mounting hole of the shell, so that the threads of the mounting hole of the shell are damaged, and the shell of the engine is scrapped;
(3) there is a common problem with both of the above-mentioned protective devices, since it becomes very difficult to remove the protective device without damaging the coating after the heat-resistant coating is completely cured, the protective device must be removed after the heat-resistant coating has gelled, and at this time, the protective device is removed, the coating has a low hardness and the coating is easily damaged.
In addition, the heat-proof coating must reach the design thickness during spraying, and can effectively play the heat protection effect, so the thickness control must be carried out in the spraying process. At present, the thickness of the coating is detected by a contact type magnetic induction eddy current thickness gauge commonly used in the field of forming of the heat-proof coating of the engine. When the thickness is measured by the instrument, a local position on a product is measured after the coating is cured, and the detection of the whole thickness of the coating is limited. For some heat-proof coatings, if the coating is measured to be too thin, the coating cannot be continuously sprayed on the surface of the cured heat-proof coating, and only the coating is removed and reworked for spraying, so that the construction period is prolonged, and a large amount of coating is wasted.
Through comparison documents and patent retrieval, relevant information about a special protection device and a protection method is not found, the protection requirement of a non-spraying surface when the engine is sprayed with the heat-proof coating can be met, and the coating thickness can be conveniently and effectively controlled in an auxiliary mode in the spraying process.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a protective device which can protect a non-spraying surface when an engine sprays heat-proof paint and can be used for simply, conveniently and effectively assisting in controlling the thickness of a coating in the spraying process.
The technical scheme adopted by the invention for solving the technical problems is as follows: a kind of engine heat-proof coating non-spraying surface protective device, the whole is the step cylinder of the non-metallic material, the end surface of the small diameter end is slotted or trepanned, can drive the step cylinder to rotate around the axis line in slotting or trepanning the place to exert force; the side wall of the small-diameter section is of a thread structure, and the threads are matched with a mounting hole in the surface of the engine; after the step column body is screwed into the mounting hole on the surface of the engine, the end face of the large-diameter end is flush with or higher than the surface of the heat-proof coating.
The end face of the large-diameter end is 1-2 mm higher than the surface of the heat-proof coating.
When the distance between the mounting hole and the adjacent mounting hole is less than or equal to 30mm, the end face of the large-diameter end is higher than the surface of the heat-proof coating and does not exceed 5 mm.
The non-metallic material is polypropylene, polyformaldehyde or polytetrafluoroethylene.
If the maximum curing temperature of the heat-proof coating is less than or equal to 100 ℃, the non-metallic material is polypropylene, polyformaldehyde or polytetrafluoroethylene; if the maximum curing temperature of the heat-proof coating is more than 100 ℃, the non-metallic material is polytetrafluoroethylene.
The invention also provides a coating forming method for spraying the heat-proof paint by using the protective device, which comprises the following steps:
(1) mounting the protection device at the position of the mounting hole, and screwing;
(2) cleaning the surface of the engine shell by using a solvent, and airing for 30-60 min;
(3) spraying for multiple times according to a heat-proof coating spraying process until the heat-proof coating is flush with the end face height of the large-diameter end of the protection device;
(4) coating curing is carried out according to a heat-proof paint curing process;
(5) polishing or turning to make the coating reach the designed thickness;
(6) and (4) slotting or perforating the end surface of the small-diameter end to screw out the protection device.
The invention has the beneficial effects that:
the spraying protection device provided by the invention utilizes the height of the upper end protection surface exposed out of the engine shell, and can play a role in simply and conveniently assisting in controlling the thickness of the coating in the spraying process.
The spraying protection device provided by the invention has a thread structure so as to ensure that the protection device is firmly installed at the protection parts such as the installation hole and the like, and when spraying the heat-proof coating, the coating is prevented from polluting the threads of the installation hole and the inner wall of the engine due to the falling of the protection device caused by the continuous rotation of the engine shell.
The spraying protection device provided by the invention is processed and manufactured by using non-metallic materials, does not damage a thread structure in a mounting hole on a metal shell of an engine in the mounting and dismounting processes, and is very suitable for the spraying process of the heat-proof coating of the engine shell with the mounting hole and other similar structures.
The non-metallic material selected by the spray protection device provided by the invention does not react with components such as heat-proof paint or solvent in the spraying process, and also does not deform and shrink under the action of high temperature in the coating curing process, and the non-metallic material has weak bonding force with the coating, is easy to remove from the cured heat-proof coating, and does not damage the coating when the device is dismounted.
The invention provides the injection molding or machining forming method of the spray protection device, which can ensure the dimensional precision of the protection device, can realize one-time mass processing, and has low cost and shorter processing period.
The invention provides a coating forming process using the spray protection device, which is suitable for the forming requirements of the outer heat-proof coatings of most engines at present, and the process flow of taking out the protection device after the coating is cured can avoid the damage of the coating due to incomplete curing of the coating when the protection device is disassembled prematurely.
Drawings
FIG. 1 is a schematic diagram of a protective device mounted to an engine housing according to an embodiment of the present invention;
FIG. 2 is a flow chart of a coating forming process using the protective device provided in the example for spraying a thermal protective paint;
in the figure, 1 is a thread fastening surface, 2 is an upper end protection surface, 3 is a bottom mounting and dismounting surface, and 4 is an engine shell heat-proof paint spraying surface.
Detailed Description
It should be noted that all directional indicators of the present invention, such as "upper end", "bottom", etc., are only used to explain the relative position relationship between the parts, the movement, etc. under a specific posture (as shown in the following summary of the invention and the subsequent drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
The invention provides a spraying protection device for a heat-proof coating of an engine shell, which comprises an upper end protection surface, a thread fastening surface and a bottom mounting and dismounting surface, wherein the whole body is in a plug shape.
The height of the upper end protection surface exposed out of the engine shell is determined by the required thickness of the heat-proof coating, and generally, the height of the upper end protection surface is the same as the designed thickness of the coating or is 1-2 mm higher than the designed thickness of the coating. When the distance between the mounting holes or the protection parts needing protection is too close, the distance between the outer diameters of the two mounting holes is generally less than or equal to 30mm, and the height of the upper end protection surface exposed out of the engine shell is not more than 5 mm.
The basic parameters of the thread form, diameter, thread pitch, thread number, thread direction and the like of the thread fastening surface are matched with the mounting hole or the protection part.
Two blind holes are arranged in the bottom mounting and dismounting surface, a cross-shaped or straight-line-shaped groove can be arranged, and the proper shape and size can be selected according to the specific implementation condition and the whole size of the protection device, so that the protection device can be mounted and dismounted conveniently.
The protection device designed by the invention is made of a non-metal material, the adhesion force of the non-metal material and the heat-proof coating is weaker, the specific material is Preferably Polypropylene (PP), Polyformaldehyde (POM) or Polytetrafluoroethylene (PTFE), if the maximum curing temperature of the heat-proof coating is less than or equal to 100 ℃, the PP, POM or PTFE can be selected as the material of the protection device, and if the maximum curing temperature of the heat-proof coating is more than 100 ℃, the PTFE must be used as the material of the protection device.
The non-metal protection device designed by the invention can be processed and formed by an injection molding or machining method in a specific processing mode related to the selected non-metal material.
The invention also provides a coating forming process for spraying the heat-proof paint by using the protective device. The method comprises the following specific steps:
(1) mounting the protection device at the position of the mounting hole, and screwing;
(2) cleaning the surface of the engine shell by using a solvent, preferably using ethanol, acetone or gasoline as a cleaning solvent until the outer surface has no oil stains and the like, and airing for 30-60 min;
(3) spraying for multiple times according to a heat-proof paint spraying process until the coating is flush with the exposed height of the upper end protection surface of the protection device, and stopping spraying;
(4) coating curing is carried out according to a heat-proof paint curing process;
(5) according to the performance of the cured heat-proof coating, the coating reaches the designed thickness by adopting a grinding or turning machining mode;
(6) the protective device is carefully unscrewed upwards by means of holes or groove-shaped structures on the bottom mounting and dismounting surface, using the necessary dismounting tools.
The technical solution and the coating forming process in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the described embodiments are only one embodiment of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in FIG. 1, the invention provides a protective device for a non-spraying surface of an engine heat-proof coating and a forming process of the heat-proof coating sprayed by using the protective method, which are used for protecting the non-spraying surface of an engine shell and simultaneously play a role in assisting in controlling the thickness of the coating in the spraying process.
The protection device comprises a thread fastening surface 1, an upper end protection surface 2 and a bottom mounting and dismounting surface 3.
The screw fastening surface 1 is fastened and installed in the installation hole of the engine shell 4 by using a screw structure in the installation hole of the engine shell and adopting a screw of M24 multiplied by 0.75-6 g.
The upper end protection surface 2 is used for protecting an engine mounting hole when spraying heat-proof paint, has the diameter of 28mm, has the height of the part exposed out of the engine of 2.8mm, is used as a coating thickness reference surface, and is used for simply, conveniently and effectively assisting in controlling the thickness of the heat-proof coating to be more than or equal to 2.7mm when spraying.
The diameter of the bottom mounting and dismounting surface 3 is 24mm, a blind hole with the diameter of 5mm is symmetrically arranged at the position 7.5mm away from the center of the bottom mounting and dismounting surface, the height of the blind hole is 4mm, and the protective device can be mounted and dismounted by utilizing the blind hole by using a tool convenient to use.
The curing temperature of the sprayed heat-proof coating is 90 ℃, the spraying is preferable, the whole protection device is made of polypropylene (PP), the use temperature of the polypropylene is higher than 90 ℃, the polypropylene does not chemically react with components or solvents of the heat-proof coating during spraying, the phenomena of serious influence on the protection effect, such as deformation, shrinkage and the like, caused by the rise of the curing temperature can be avoided during curing, the surface of the polypropylene is smooth, the bonding force between the heat-proof coating and the polypropylene is weak, and after the coating is cured, the coating can be guaranteed not to be damaged when the protection device is detached.
The whole protection device is made of polypropylene, the number of the installation holes distributed on the surface of the engine is large, the protection device is preferably manufactured in an injection molding processing mode, the protection device can be manufactured and molded in a large batch at one time, and the size precision of the protection device can be guaranteed.
During spraying, according to the process flow, as shown in figure 2, firstly, the protection device is installed at an installation hole part on an engine shell, a thread fastening surface 1 is used for screwing to prevent the protection device from falling off in the spraying process, then, the surface 4 of the engine shell is cleaned by ethanol until the outer surface is free of oil stains and the like, the protection device is aired for 30-60 min, heat-proof paint is sprayed, spraying is carried out for multiple times according to the spraying process until the heat-proof coating is flush with the protection surface 2 at the upper end of the protection device, the spraying is stopped, the curing is carried out according to the coating curing process of preserving heat at 48 ℃ for 5h → preserving heat at 60 ℃ for 20h → preserving heat at 90 ℃ for 20h, the temperature is naturally cooled to room temperature after the curing is finished, the thickness of the heat-proof coating is processed to be 2.7mm according to the required thickness by adopting an adding mode, the process simultaneously, and (4) carefully screwing the protection device upwards out by using a necessary dismounting tool to finish the processing and forming of the whole heat-proof coating.
The heat-proof coating forming process provided by the invention utilizes the protection device provided by the invention, so that a non-spraying surface can be effectively protected, the heat-proof coating is prevented from polluting the threads of an engine mounting hole or the inner wall of an engine shell, meanwhile, the coating thickness can be simply and conveniently controlled in an auxiliary manner in the spraying process by utilizing the height of the protection device, and the heat-proof coating forming process can be popularized and used.
The above examples are only for illustrating the technical solutions of the present invention, and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (4)
1. The utility model provides an engine heat protection coating non-spraying face protection device which characterized in that: the whole is a step cylinder made of nonmetal materials, the end face of the small-diameter end is grooved or perforated, and force is applied to the grooved or perforated position to drive the step cylinder to rotate around the axis; the side wall of the small-diameter section is of a thread structure, and the threads are matched with a mounting hole in the surface of the engine; after the step column body is screwed into the mounting hole in the surface of the engine, the end face of the large-diameter end is flush with the surface of the heat-proof coating, or the end face of the large-diameter end is 1-2 mm higher than the surface of the heat-proof coating.
2. The engine heat shielding coating non-sprayed surface protection device according to claim 1, characterized in that: the non-metal material is polypropylene, polyformaldehyde or polytetrafluoroethylene.
3. The engine heat shielding coating non-sprayed surface protection device according to claim 1, characterized in that: if the maximum curing temperature of the heat-proof coating is less than or equal to 100 ℃, the non-metallic material is polypropylene, polyformaldehyde or polytetrafluoroethylene; if the maximum curing temperature of the heat-proof coating is more than 100 ℃, the non-metallic material is polytetrafluoroethylene.
4. A coating forming method using the engine heat shielding paint non-sprayed surface protection device according to claim 1, characterized by comprising the steps of:
(1) mounting the protection device at the position of the mounting hole, and screwing;
(2) cleaning the surface of the engine shell by using a solvent, and airing for 30-60 min;
(3) spraying for multiple times according to a heat-proof coating spraying process until the heat-proof coating is flush with the end face height of the large-diameter end of the protection device;
(4) coating curing is carried out according to a heat-proof paint curing process;
(5) polishing or turning to make the coating reach the designed thickness;
(6) and (4) slotting or perforating the end surface of the small-diameter end to screw out the protection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910820286.0A CN110560290B (en) | 2019-09-01 | 2019-09-01 | Engine heat-proof coating non-spraying surface protection device and coating forming method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910820286.0A CN110560290B (en) | 2019-09-01 | 2019-09-01 | Engine heat-proof coating non-spraying surface protection device and coating forming method |
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| Publication Number | Publication Date |
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| CN110560290A CN110560290A (en) | 2019-12-13 |
| CN110560290B true CN110560290B (en) | 2021-06-15 |
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| CN201910820286.0A Active CN110560290B (en) | 2019-09-01 | 2019-09-01 | Engine heat-proof coating non-spraying surface protection device and coating forming method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103589985A (en) * | 2013-11-12 | 2014-02-19 | 哈尔滨东安发动机（集团）有限公司 | Processing method of coating of aero-engine case |
| CN103882360A (en) * | 2014-03-26 | 2014-06-25 | 哈尔滨东安发动机（集团）有限公司 | Protective method of through holes on thermal sprayed surface |
| CN104389885A (en) * | 2014-10-31 | 2015-03-04 | 重庆戴卡捷力轮毂制造有限公司 | Bolt hole protecting plug |
| CN109317377A (en) * | 2018-11-22 | 2019-02-12 | 中国航发沈阳黎明航空发动机有限责任公司 | The compatible coating coating of low temperature multiband and repair method in engine tail nozzle part |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150079288A1 (en) * | 2014-11-25 | 2015-03-19 | Caterpillar Inc. | Plug assembly for masking threaded holes |
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2019
- 2019-09-01 CN CN201910820286.0A patent/CN110560290B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103589985A (en) * | 2013-11-12 | 2014-02-19 | 哈尔滨东安发动机（集团）有限公司 | Processing method of coating of aero-engine case |
| CN103882360A (en) * | 2014-03-26 | 2014-06-25 | 哈尔滨东安发动机（集团）有限公司 | Protective method of through holes on thermal sprayed surface |
| CN104389885A (en) * | 2014-10-31 | 2015-03-04 | 重庆戴卡捷力轮毂制造有限公司 | Bolt hole protecting plug |
| CN109317377A (en) * | 2018-11-22 | 2019-02-12 | 中国航发沈阳黎明航空发动机有限责任公司 | The compatible coating coating of low temperature multiband and repair method in engine tail nozzle part |
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| CN110560290A (en) | 2019-12-13 |
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