Water transfer printing cloud pattern grating suitable for laser restoration body and preparation method thereof

Abstract

The embodiment of the present application provides a water transfer printing cloud pattern grating suitable for a laser repair body and a preparation method, the preparation method of the water transfer printing cloud pattern grating in the embodiment of the present application has the advantages of simple operation, strong repeatability, high temperature resistance and the like, can standardize a cloud pattern grating carrier preparation process, the water transfer printing cloud pattern grating prepared has a grating pitch not less than 100 microns, and is very suitable for macroscopic object deformation measurement; meanwhile, the embodiment of the present application can effectively avoid surface damage caused by a cloud pattern grating carrier preparation process to the laser repair body, and achieves the purpose of nondestructive measurement; in addition, the water transfer printing cloud pattern grating provided in the embodiment of the present application can be applied in room temperature and high temperature environments, and effectively solves the problems of a complicated high-temperature cloud pattern grating preparation process and high cost.

Description

Technical Field

[0001] This invention relates to the field of photomechanical technology, and more specifically, to a water transfer printing moiré grating suitable for laser restorations and its preparation method. Background Technology

[0002] The moiré method (including sampling moiré and digital moiré techniques) is a full-field deformation measurement method based on phase analysis technology. Its principle involves preparing a grid carrier on the surface of the test piece and obtaining deformation information by calculating the phase change of the grating image before and after deformation. Due to its excellent noise resistance and non-contact advantages, it is now widely used in fracture mechanics, dynamic testing, and micro-deformation measurement. As a crucial information carrier for measuring the deformation field of an object using the moiré method, the quality of the grating has a significant impact on the measurement accuracy and consistency of the calculation results. Especially in high-temperature environments, high-contrast grating images can greatly reduce the impact of high-temperature image noise.

[0003] However, the preparation of high-temperature resistant meshes remains a challenging problem when using the sampling moiré method for high-temperature deformation measurement. In macroscopic mesh preparation techniques, laser marking technology uses a laser beam to etch a mesh onto the surface of a specimen; however, direct etching of the specimen surface can cause damage. Existing technology CN112705857A discloses a method for preparing macroscopic high-temperature resistant meshes; however, this method requires specialized laser marking equipment, and the specimen's heat preservation and cooling time is too long. Furthermore, for heterogeneous materials such as laser-etched restorations, surface etching may affect the microstructure of the restoration.

[0004] Therefore, how to provide a water transfer printing cloud pattern grating suitable for laser restorations and its preparation method, and avoid damage to the surface of the restoration of heterogeneous materials, is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The present invention aims to at least partially solve one of the technical problems in the related art, and provides a water transfer printing cloud pattern grating suitable for laser restoration and its preparation method. The preparation time of the water transfer printing cloud pattern grating can be shortened to less than 15 minutes, which is time-saving and highly repeatable; and it can be applied to curved test pieces without damaging the surface of the test piece.

[0006] In view of this, embodiments of the present invention propose a method for preparing a water transfer printing moiré grating suitable for laser restorations, comprising the following steps:

[0007] Prepare a mottled grating template; after determining the grating pitch of the mottled grating according to the resolution of the measurement system, generate a mottled grating vector file, and print the mottled grating vector file onto a water transfer sticker;

[0008] The specimen preparation involves coating the surface of the pretreated specimen with a high-temperature resistant paint to form a paint film.

[0009] The cloud-pattern grating template is adhered to the outside of the paint film using water transfer printing and then heated and cured, so that the cloud-pattern grating vector file is transferred to the outside of the paint film;

[0010] Separate the water-transfer printed cloud-patterned grating template and coat the outside of the cloud-patterned grating vector file outside the paint film with protective oil.

[0011] In some embodiments, the pitch of the moiré grating is determined to be 8-20 pixels based on the specimen size and the resolution of the measurement system, and the moiré grating vector file is generated using a computer.

[0012] In some embodiments, the cloud-pattern raster vector file is printed onto a water transfer sticker using a laser printer.

[0013] In some embodiments, the pretreatment method for the specimen is: mechanically polishing the surface of the specimen and then cleaning it with anhydrous ethanol or acetone solution.

[0014] In some embodiments, the method for forming the paint film is as follows: spraying the high-temperature resistant paint multiple times at a distance of 20 cm from the surface of the pretreated specimen; the high-temperature resistant paint is a white high-temperature self-spraying paint.

[0015] In some embodiments, the water transfer printing method is as follows:

[0016] Apply an adhesive to the cloud-patterned grating vector file of the cloud-patterned grating template and immerse the entire file in water for 30-60 seconds;

[0017] The side of the cloud-patterned grating template coated with the adhesive is adhered to the paint film.

[0018] In some embodiments, the heat curing method is as follows: place it on a heating plate at 80°C and cure for 5-8 minutes; then air cool to room temperature.

[0019] In some embodiments, the method of applying protective oil is as follows: spray the protective oil multiple times at a distance of 20cm from the surface of the cloud-patterned raster vector file, and then let it stand for 1 minute; the protective oil is a high-temperature resistant transparent varnish.

[0020] In some embodiments, a water transfer printing cloud pattern grating suitable for laser restorations is proposed, which is prepared using the method described in any of the above embodiments.

[0021] In some embodiments, the moiré grating includes:

[0022] The specimen includes an upper surface and a lower surface that are positioned opposite each other.

[0023] A high-temperature resistant paint film, wherein the paint film is applied to the upper or lower surface of the specimen;

[0024] A cloud-pattern raster vector file, which is attached to the side of the paint film away from the specimen by the adhesive, and is tightly adhered to the paint film; and

[0025] A protective oil layer is disposed on the side of the moiré raster vector file away from the paint film.

[0026] Through the above technical solutions, this invention proposes a water transfer printing moiré grating suitable for laser restorations and its preparation method, which has the following technical effects: The preparation method of the water transfer printing moiré grating in this embodiment of the invention has the advantages of being simple and easy to operate, highly repeatable, and resistant to high temperatures. It can standardize the preparation process of the moiré grating carrier, and the grating pitch of the prepared water transfer printing moiré grating is not less than 100 micrometers, which is very suitable for macroscopic object deformation measurement. At the same time, this embodiment of the invention can effectively avoid surface damage to the laser restoration during the preparation process of the moiré grating carrier, achieving the purpose of non-destructive measurement. In addition, the water transfer printing moiré grating provided in this embodiment of the invention can be used in room temperature and high temperature environments, effectively solving the problems of cumbersome and costly preparation process of high temperature moiré gratings. Attached Figure Description

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0028] Figure 1 This is a flowchart illustrating the fabrication process of the water transfer printing cloud-pattern grating provided by the present invention.

[0029] Figure 2 This is a schematic diagram of the structure of the water transfer printing cloud pattern grating provided by the present invention.

[0030] Figure 3 This is an image of the water transfer printing cloud pattern grating provided in Embodiment 1 of the present invention.

[0031] Figure 4 These are images of water transfer printing cloud-pattern gratings provided in Embodiments 2-5 and Comparative Examples 1-2 of the present invention.

[0032] The components are: 1. Specimen; 2. Paint film; 3. Adhesive; 4. Protective oil layer; 5. Mosaic raster vector file. Detailed Implementation

[0033] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

[0034] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0035] In view of this, such as Figure 1 As shown in the figure, this invention proposes a method for preparing a water transfer printing moiré grating suitable for laser restorations, comprising the following steps:

[0036] S1: Prepare a mottled grating template; after determining the grating pitch of the mottled grating according to the resolution of the measurement system, generate a mottled grating vector file 5, and print the mottled grating vector file 5 onto a water transfer sticker;

[0037] S2: Preparation of specimen 1; High-temperature resistant paint is coated on the surface of the pretreated specimen 1 to form a paint film 2;

[0038] S3: Use water transfer printing to attach the cloud pattern raster template to the outside of the paint film 2 and heat it to cure, so that the cloud pattern raster vector file 5 is transferred to the outside of the paint film 2;

[0039] S4: Separate the cloud-patterned raster template after water transfer printing, and coat the cloud-patterned raster vector file 5 outside the paint film 2 with protective oil.

[0040] In this embodiment, the method for preparing a water-transfer patterned grating for a laser restoration based on heterogeneous materials can be completed within 15 minutes, which is time-efficient and highly repeatable. Furthermore, using water transfer technology, the generated patterned grating vector file 5 is transferred to the surface of the specimen 1 without damage by using a water transfer sticker as the intermediate medium. The specimen 1 in this embodiment is made of metal, such as stainless steel, high-temperature alloy, aluminum alloy, or titanium alloy. In addition, this embodiment does not require high surface flatness of the specimen 1 and is applicable to specimens with curved shapes. The patterned grating prepared according to the method in this embodiment is suitable for both room temperature and high-temperature environments.

[0041] In some embodiments, in S1, the grating pitch of the mottled grating is determined to be 8-20 pixels based on the size of the specimen 1 and the resolution of the measurement system, and a mottled grating vector file 5 is generated using a computer, wherein the mottled grating vector file 5 can be printed onto a water transfer sticker using a laser printer.

[0042] Specifically, depending on the image acquisition system, the resolution of the measurement system varies. Those skilled in the art can determine the grating pitch of the moiré grating by the size of the specimen 1 and the resolution of the measurement system. For example, in this embodiment, the grating pitch of the moiré grating is 8-20 pixels, not limited to any theoretical value. In this embodiment, the grating pitch of the moiré grating is 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, and 20 pixels. At the same time, a moiré grating vector file 5 is generated by computer, and the generated moiré grating vector file 5, i.e., the moiré grating image, is printed onto a water transfer sticker. It is known that the grating pitch of the moiré grating is relative and related to the resolution of the measurement system.

[0043] In some embodiments, the pretreatment method for specimen 1 in S2 is as follows: the surface of specimen 1 is mechanically polished and then cleaned with anhydrous ethanol or acetone solution.

[0044] Specifically, the surface of the specimen 1 can be polished by using 400-grit, 600-grit, and 800-grit sandpaper in sequence. The sandpaper should be changed only after the previous grinding marks are completely removed. In this embodiment, the purpose of polishing the surface of the specimen 1 is to remove the relatively rough traces of machining. The polished metal specimen 1 can be cleaned and wiped with anhydrous ethanol or acetone solution to remove oil and impurities from the surface of the specimen 1.

[0045] In some embodiments, the method for forming the high-temperature resistant paint film 2 in S2 is as follows: spraying high-temperature resistant paint multiple times at a distance of 20cm from the surface of the pretreated specimen 1; the high-temperature resistant paint is a white high-temperature self-spraying paint.

[0046] Specifically, the white high-temperature self-spraying paint is Goot white high-temperature self-spraying paint, which is readily available and easy to operate. The number of sprays is 3 or 4, with an interval of 2 seconds between each spray, which reduces economic and time costs. In addition, the cloud pattern raster vector file 5 in this invention is black, and the contrast between white and black is obvious, resulting in high contrast of the cloud pattern raster under normal / high temperature environments.

[0047] It should be noted that fewer coats of white high-temperature spray paint, such as one or two coats, will result in an excessively thin paint film 2. However, more coats, such as six coats, with longer intervals between each coat, will lead to a longer waiting time. If spraying is continuous without intervals, the air jet can easily blow away the undried paint layer from the previous coat, affecting the uniformity of the paint film 2. Spraying from a distance of 20cm from the surface of the pretreated specimen 1 ensures good uniformity of the paint film 2, resulting in a uniform application of the white high-temperature spray paint that dries quickly and forms a film.

[0048] In some embodiments, the water transfer printing method in S3 is as follows:

[0049] Apply adhesive 3 to the cloud pattern grating vector file 5 of the cloud pattern grating template and immerse the entire template in water for 30-60 seconds. During the immersion process, the water volume needs to cover the cloud pattern grating template for at least 30 seconds, or it can be 40 seconds, 50 seconds, 55 seconds, or 60 seconds. After immersion, attach the side of the cloud pattern grating template coated with adhesive 3 to the paint film 2.

[0050] In some embodiments, the heating and curing method in S4 is as follows: place it on a heating plate at 80°C and cure for 5-8 minutes; then air cool to room temperature.

[0051] Specifically, after the cloud-patterned grating template is tightly bonded to the paint film 2 on the outer side of the specimen 1 using adhesive 3, the entire piece is placed on a heating plate and heated at 80°C for 5-8 minutes. The heating time can be 5 minutes, 6 minutes, 7 minutes, or 8 minutes, without being limited to any theoretical range, to allow the adhesive 3 and the high-temperature resistant paint film 2 to cure. Afterwards, it is cooled to room temperature in air for 5 minutes. It should be noted that in this embodiment, the curing temperature and curing time are independent of the adhesive 3; a curing temperature higher than 80°C would mainly result in an excessively long cooling time; and the adhesive 3 is a commonly used adhesive, whose main components are water and xylene.

[0052] In some embodiments, the method of applying protective oil in S4 is as follows: spraying protective oil multiple times at a distance of 20cm from the surface of the cloud-patterned raster vector file 5 and then letting it stand for 1 minute; the protective oil is a high-temperature resistant transparent varnish.

[0053] Specifically, the protective oil is a high-temperature resistant transparent varnish, which is readily available and easy to apply. It is applied in three or four coats, with a two-second interval between each coat. The application method is as follows: spray the protective oil multiple times at a distance of 20cm from the surface of the moiré raster vector file 5, and then let it stand for one minute. In this embodiment, the high-temperature resistant oil layer formed after applying the protective oil is used to protect the raster pattern in high-temperature environments, thereby ensuring image contrast.

[0054] In some embodiments, a water transfer printing moiré grating suitable for laser restorations is proposed, prepared using the method in any of the above embodiments, comprising a specimen 1, a high-temperature resistant paint film 2, a moiré grating vector file 5, and a protective oil layer 4; wherein the specimen 1 includes an upper surface and a lower surface disposed opposite to each other, and the paint film 2 is disposed on the upper surface or the lower surface of the specimen 1. Taking the paint film 2 disposed on the upper surface of the specimen 1 as an example, the paint film 2 is disposed above the upper surface of the specimen 1, the moiré grating vector file 5 is disposed above the upper surface of the paint film 2 by an adhesive 3, and is tightly cured and bonded to the paint film 2; the protective oil layer 4 is disposed above the upper surface of the moiré grating vector file 5.

[0055] Those skilled in the art will understand the technical solution of placing the paint film 2 below the lower surface of the specimen 1 through the above description, and will not be repeated here. The water transfer printing moiré grating obtained in this embodiment has a grating pitch of not less than 100 micrometers, which is very suitable for macroscopic object deformation measurement; and compared with the same type of grating preparation carrier technology, the water transfer printing moiré grating in this embodiment can be used in room temperature and high temperature environments, and has the advantages of low cost, simple operation, and strong repeatability.

[0056] Example 1

[0057] In this embodiment, specimen 1 is made of high-temperature nickel-based alloy GH4169. The fabricated moiré grating has a grating pitch of 8 pixels and 207 micrometers. The entire fabrication process takes 15 minutes, including 5 minutes of natural cooling. The method in this embodiment specifically includes the following steps:

[0058] S1: After determining that the grating pitch of the cloud pattern grating is 8 pixels, use a computer to generate a cloud pattern grating vector file 5, and then print the generated cloud pattern grating vector file 5, i.e. the cloud pattern grating image, onto a water transfer sticker.

[0059] S2: The surface of the high-temperature nickel-based alloy GH4169 was polished using mechanical polishing. 400-grit, 600-grit, and 800-grit sandpaper were used sequentially for polishing. The sandpaper was changed only after all previous grinding marks were completely removed. The polished surface of the high-temperature nickel-based alloy GH4169 was then wiped with anhydrous ethanol. Goot white high-temperature self-spraying paint was then sprayed onto the surface of the high-temperature nickel-based alloy GH4169 from a distance of 20cm, with three coats applied, each with a 2-second interval.

[0060] S3: Apply adhesive 3 to the cloud pattern raster vector file 5 of the cloud pattern raster template, and immerse the entire template in water for 40 seconds. After immersion, attach the side of the cloud pattern raster template coated with adhesive 3 to the paint film 2. After close adhesion, place the entire template on a heating plate at 80°C for 5 minutes to cure the adhesive 3 and the high-temperature resistant paint film 2. Then, cool it to room temperature in air for 5 minutes.

[0061] S4: Separate the cloud pattern grating template after water transfer printing. The cloud pattern grating vector file 5 is transferred to one side of the paint film 2 by the adhesive 3, and the water transfer sticker is separated. Spray protective oil 3 times at a distance of 20cm from the surface of the cloud pattern grating vector file 5, with an interval of 2 seconds between each spray, and then let it stand for 1 minute.

[0062] In this embodiment, the water transfer printing cloud-pattern grating is as follows: Figure 2 and Figure 3As shown, the sample includes a specimen 1, a high-temperature resistant paint film 2, a mottled raster vector file 5, and a protective oil layer 4. The specimen 1 includes an upper surface and a lower surface that are arranged opposite to each other. The paint film 2 is disposed above the upper surface of the specimen 1. The mottled raster vector file 5 is disposed above the upper surface of the paint film 2 by an adhesive 3 and is tightly cured and bonded to the paint film 2. The protective oil layer 4 is disposed above the upper surface of the mottled raster vector file 5.

[0063] In Examples 2-5 and Comparative Examples 1-2, except for adjustments according to Table 1, everything else is the same as in Example 1, and the resulting raster images are as follows: Figure 4 As shown in the figure, a is a raster image of Example 2; b is a raster image of Example 3; c is a raster image of Example 4; d is a raster image of Example 5; e is a raster image of Comparative Example 1; and f is a raster image of Comparative Example 2.

[0064] Table 1 shows the preparation methods of water transfer printing cloud-pattern gratings suitable for laser restorations in different embodiments and comparative examples 1-2.

[0065]

[0066] As shown in Table 1, the grating images in Examples 1-5 can all be acquired by the camera at room temperature, and their periodic structure is obvious; while the grating images in Comparative Examples 1-2 all require the camera to acquire at a temperature of 500℃.

[0067] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing a water transfer printing moiré grating suitable for laser restorations, characterized in that, Includes the following steps: Prepare a mottled grating template; after determining the grating pitch of the mottled grating according to the resolution of the measurement system, generate a black mottled grating vector file, and print the mottled grating vector file onto a water transfer sticker using a laser printer; Specimen preparation; A white paint film is formed by coating the surface of the pretreated specimen with a high-temperature resistant paint; the specimen is made of metal, including stainless steel, high-temperature alloy, aluminum alloy, and titanium alloy. The cloud-pattern grating template is adhered to the outside of the paint film using water transfer printing and then heated and cured, so that the cloud-pattern grating vector file is transferred to the outside of the paint film. The water transfer printing method is as follows: an adhesive is coated on the cloud-pattern grating vector file of the cloud-pattern grating template, and the entire template is immersed in water for 30-60 seconds; the side of the cloud-pattern grating template coated with the adhesive is then adhered to the paint film. Separate the cloud-patterned grating template after water transfer printing, and coat the cloud-patterned grating vector file outside the paint film with a protective oil, which is a high-temperature resistant transparent varnish.

2. The preparation method according to claim 1, characterized in that, The pitch of the moiré grating is determined to be 8-20 pixels based on the specimen size and the resolution of the measurement system, and the vector file of the moiré grating is generated using a computer.

3. The preparation method according to claim 1, characterized in that, The pretreatment method for the specimen is as follows: the surface of the specimen is mechanically polished and then cleaned with anhydrous ethanol or acetone solution.

4. The preparation method according to claim 1, characterized in that, The method for forming the paint film is as follows: spray the high-temperature resistant paint multiple times at a distance of 20cm from the surface of the pretreated specimen; the high-temperature resistant paint is a white high-temperature self-spraying paint.

5. The preparation method according to any one of claims 1-4, characterized in that, The heat curing method is as follows: place it on a heating plate at 80℃ and cure for 5-8 minutes; then air cool to room temperature.

6. The preparation method according to any one of claims 1-4, characterized in that, The method for applying protective oil is as follows: spray the protective oil multiple times from a distance of 20cm from the surface of the cloud-patterned raster vector file, and then let it stand for 1 minute.

7. A water transfer printing moiré grating suitable for laser-restored implants, characterized in that, It is prepared by any one of claims 1-6; and its grid pitch is not less than 100 micrometers, making it suitable for measuring the deformation of macroscopic objects.

8. The mottled grating according to claim 7, characterized in that, include The specimen includes an upper surface and a lower surface that are positioned opposite each other. A high-temperature resistant paint film, wherein the paint film is applied to the upper or lower surface of the specimen; A cloud-patterned raster vector file, which is attached to the side of the paint film away from the specimen by the adhesive, and is tightly adhered to the paint film; and A protective oil layer is disposed on the side of the moiré raster vector file away from the paint film.

Images