Method for preparing metal two-dimensional code using 3D printing equipment and three-dimensional metal two-dimensional code

Abstract

The present invention relates to a method for preparing a metal two-dimensional code using a 3D printing device and a three-dimensional metal two-dimensional code. The method for preparing a metal two-dimensional code using a 3D printing device includes the following steps: providing a substrate; providing a plurality of carrier plates made of metal material; installing each carrier plate one by one and detachably on each installation station; positioning the substrate in a molding cavity of a laser selective melting 3D printing device; obtaining the position information of each carrier plate on the substrate; the laser performs 3D printing according to a preset two-dimensional code image and the position information of the carrier plate to form a three-dimensional two-dimensional code molding structure on each carrier plate; the carrier plate is removed from the substrate to obtain a three-dimensional metal two-dimensional code formed by the carrier plate and the two-dimensional code molding structure. By executing the above-mentioned method for preparing a metal two-dimensional code using a 3D printing device, the batch processing efficiency of the three-dimensional metal two-dimensional code can be improved while ensuring that the three-dimensional metal two-dimensional code has high product quality and recognition.

Description

Technical Field

[0001] The present invention relates to the technical field of two-dimensional code preparation, and in particular to a method for preparing a metal two-dimensional code using a 3D printing device and a three-dimensional metal two-dimensional code. Background Art

[0002] With the continuous development of information technology, QR codes have been widely used in life and production, such as QR code payment, QR code logistics information tracking, QR code business cards, QR code delivery, QR code management production, etc. At present, QR codes are mainly printed by printers, and some with special needs will use laser printing, but these production methods have a common disadvantage. Whether it is paper version of QR code or laser printing, it cannot meet the customer's needs for durability, wear resistance, and corrosion resistance. In order to meet the above needs, metal QR codes came into being. However, traditional metal QR code processing methods generally have the problem of slow processing speed. Especially in the batch processing of metal QR codes, usually multiple QR code graphics are processed on a whole plate, and then the edge cutting is performed by wire cutting. In view of the current people's growing demand for metal QR codes, this method of batch processing of metal QR codes still has the problem of low processing efficiency. Summary of the invention

[0003] Based on this, it is necessary to provide a method for preparing metal QR codes using 3D printing equipment and a three-dimensional metal QR code that have both high processing accuracy and high batch processing efficiency in order to address the problem of low processing efficiency in traditional metal QR code batch processing methods.

[0004] A method for preparing a metal two-dimensional code using a 3D printing device, comprising the steps of:

[0005] Providing a substrate having a plurality of installation stations arranged at intervals;

[0006] Providing multiple metal bearing plates;

[0007] Installing the supporting plates one by one and detachably on the installation stations;

[0008] Positioning the substrate with the carrier plate installed in a molding cavity of a laser selective melting 3D printing device;

[0009] Acquire an environmental image of all the carrier plates on the substrate, and perform image recognition on the environmental image to obtain position information of each carrier plate on the substrate;

[0010] The laser of the laser selective melting 3D printing device performs 3D printing according to the preset two-dimensional code image and the position information of the carrier plate to form a three-dimensional two-dimensional code forming structure on each of the carrier plates;

[0011] The carrying plate is removed from the base plate to obtain a three-dimensional metal two-dimensional code formed by the carrying plate and the two-dimensional code forming structure.

[0012] In one of the embodiments, the step of detachably mounting each of the supporting plates on each of the installation stations in a one-to-one correspondence is as follows: detachably mounting each of the supporting plates on each of the installation stations in a one-to-one correspondence by means of threaded connection.

[0013] In one of the embodiments, a plurality of mounting holes serving as the mounting stations are provided on the substrate;

[0014] The step of providing a plurality of metal bearing plates comprises the steps of: machining the metal plate to obtain a plate body of a preset size; and opening a threaded blind hole on one side of the plate body;

[0015] The steps of detachably mounting each of the supporting plates on each of the installation stations in a one-to-one correspondence by means of threaded connection are as follows: passing the threaded fastener through the installation hole and screwing it into the corresponding threaded blind hole to detachably mount each of the supporting plates on the base plate.

[0016] In one embodiment, after the step of passing the threaded fastener through the mounting hole and screwing it into the corresponding threaded blind hole to detachably mount each of the carrier plates on the base plate, the method further includes the steps of: rotating the carrier plates so that the carrier plates are placed in a preset placement posture;

[0017] The step of performing image recognition on the environment image to obtain the position information of each of the carrier plates on the substrate is: performing image recognition on the environment image to obtain the position information and placement direction information of each of the carrier plates on the substrate;

[0018] The laser of the laser selective melting 3D printing device performs 3D printing according to the preset two-dimensional code image and the position information of the carrier plate to form a three-dimensional two-dimensional code molding structure on each of the carrier plates. The step is: the laser of the laser selective melting 3D printing device performs 3D printing according to the preset two-dimensional code image, the position information and the placement direction information of the carrier plate to form a three-dimensional two-dimensional code molding structure on each of the carrier plates.

[0019] In one embodiment, the step of forming the two-dimensional code forming structure on each of the carrier plates by the laser is as follows: the laser selective melting 3D printing device selects three different sintering processes for zoned sintering to form the two-dimensional code forming structure including the outer protective shell, the core matrix and the two-dimensional code body on the carrier plate;

[0020] The outer protective shell is formed on the carrier plate; the outer protective shell has a receiving groove on one side away from the carrier plate; the core substrate is formed at the bottom of the receiving groove and matches the receiving groove; the two-dimensional code body is a hollow structure formed on the core substrate according to the preset two-dimensional code image;

[0021] The density in the sintering process for forming the core matrix is ​​lower than the density in the sintering process for forming the two-dimensional code body.

[0022] In one embodiment, the sintering process for forming the outer protective shell is: density greater than or equal to 90%, laser power of 100 watts to 500 watts, scanning speed of 800 mm / s to 2000 mm / s, and line spacing of 0.03 mm to 0.3 mm;

[0023] The sintering process for forming the core matrix is: density of 60% to 80%, laser power of 100 watts to 500 watts, scanning speed of 800 mm / s to 2000 mm / s, and line spacing of 0.03 mm to 0.3 mm;

[0024] The sintering process used to form the two-dimensional code body is: density greater than or equal to 99%, laser power is 100 watts to 500 watts, scanning speed is 800 mm / second to 2000 mm / second, and line spacing is 0.03 mm to 0.3 mm.

[0025] In one of the embodiments, in a direction perpendicular to the carrying board, a distance between a surface of the core substrate facing away from the carrying board and a surface of the peripheral protective shell facing away from the carrying board is greater than a thickness of the two-dimensional code body.

[0026] In one embodiment, the core substrate and the two-dimensional code body have different colors.

[0027] In one of the embodiments, the orthographic projection of the two-dimensional code forming structure on the supporting plate coincides with the surface of the supporting plate.

[0028] A three-dimensional metal two-dimensional code is formed by using the method for preparing a metal two-dimensional code using a 3D printing device as described above.

[0029] The above-mentioned method for preparing metal two-dimensional codes using 3D printing equipment and three-dimensional metal two-dimensional codes, by detachably mounting multiple carrier plates on a substrate, and using laser selective melting 3D printing equipment to form two-dimensional code forming structures on multiple carrier plates in sequence, and then removing multiple carrier plates from the substrate after forming, to obtain multiple three-dimensional metal two-dimensional codes. Compared with the method in the prior art that needs to be segmented by wire cutting after batch printing, the above-mentioned method for preparing metal two-dimensional codes using 3D printing equipment is to separate by disassembling the carrier plates, which effectively improves the separation speed of each three-dimensional metal two-dimensional code, and thus can improve the batch processing efficiency of three-dimensional metal two-dimensional codes. Further, the position information of all carrier plates on the substrate is obtained, and then a laser is used to perform 3D printing according to the position information to form a two-dimensional code forming structure on each carrier plate, which greatly improves the forming accuracy and is conducive to improving product quality. Therefore, by executing the above-mentioned method for preparing metal two-dimensional codes using 3D printing equipment, the batch processing efficiency of three-dimensional metal two-dimensional codes can be improved while ensuring that the three-dimensional metal two-dimensional codes have high product quality and recognition. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0031] Figure 1 A cross-sectional view of a three-dimensional metal two-dimensional code provided by an embodiment of the present invention;

[0032] Figure 2 It is a flow chart of a method for preparing a metal two-dimensional code using a 3D printing device in a preferred embodiment of the present invention.

[0033] Description of the reference numerals in the specific implementation manner: 100, three-dimensional metal QR code; 110, carrying plate; 111, threaded blind hole; 120, two-dimensional molding structure; 121, outer protective shell; 1211, accommodating groove; 122, core substrate; 123, QR code body. DETAILED DESCRIPTION

[0034] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Preferred embodiments of the present invention are provided in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0036] When describing positional relationships, unless otherwise specified, when an element is referred to as being "on" another element, it can be directly on the other element or there can be an intermediate element. It is also understood that when an element is referred to as being "between" two elements, it can be the only one between the two elements, or there can be one or more intermediate elements.

[0037] In the case of using “including”, “having”, and “comprising” described herein, another component may be added unless a clear limiting term such as “only”, “consisting of”, etc. is used. Unless mentioned otherwise, a term in the singular form may include a plural form and should not be understood as being one in number.

[0038] As described in the background technology, the current batch processing of metal two-dimensional codes generally involves printing multiple two-dimensional codes on a whole plate, and then cutting and separating them in the direction of wire cutting after printing to obtain multiple metal two-dimensional codes. However, the method of cutting and separating by wire cutting is very slow, which greatly affects the batch processing efficiency of metal two-dimensional codes. To this end, the applicant proposes a method for preparing metal two-dimensional codes using a 3D printing device.

[0039] See also Figure 1 and Figure 2 One embodiment of the present application provides a method for preparing a metal two-dimensional code using a 3D printing device, which is used for batch processing of three-dimensional metal two-dimensional codes 100. The method for preparing a metal two-dimensional code using a 3D printing device includes steps S10 to S70.

[0040] Step S10, providing a substrate having a plurality of installation stations arranged at intervals.

[0041] Specifically, a substrate of a preset shape and size is obtained by mechanical processing. The installation station can be a structure such as a hole, a groove, a convex column, a buckle, etc. provided on the substrate to facilitate the connection of other parts.

[0042] It should be noted that the substrate, as an auxiliary tool, can be reused during the batch processing of the three-dimensional metal two-dimensional code 100. Therefore, during the processing of each batch of the three-dimensional metal two-dimensional code 100, the substrate does not need to be reprocessed.

[0043] Step S20, providing a plurality of metal carrier plates 110. Specifically, the plurality of carrier plates 110 are obtained by machining. The carrier plates 110 can be rectangular plates, polygonal plates, circular plates, plates of different shapes (such as leaf shapes, cloud shapes, dialog box shapes, etc.) or plates of other shapes, and can be designed according to the requirements of the edge shape of the three-dimensional metal two-dimensional code 100.

[0044] Step S30 , detachably installing each of the supporting plates 110 on each installation station in a one-to-one correspondence.

[0045] Specifically, the carrier plates 110 are detachably installed one by one on the installation station by means of threaded connection, clamping, etc., so that each carrier plate 110 is fixed on the substrate, reducing the probability of substrate deviation due to movement, shaking, etc. of the substrate during subsequent processing, which is beneficial to improving processing accuracy.

[0046] Step S40, positioning the substrate with the carrier plate 110 mounted thereon in a molding cavity of a laser selective melting 3D printing device.

[0047] In one embodiment, the substrate is placed in the molding cavity and positioned by using the structure in the molding cavity. In another embodiment, the substrate is positioned in the molding cavity by using other auxiliary structures such as positioning fixtures, threaded fasteners, and limit pins.

[0048] Step S50 , acquiring an environmental image of all the carrier plates 110 on the substrate, and performing image recognition on the environmental image to obtain position information of each carrier plate 110 on the substrate.

[0049] Specifically, the visual inspection system is used to obtain the environmental images of all the carrier plates 110 on the substrate, and image recognition is performed on the environmental graphics to obtain the coordinate information of each carrier plate 110 on the substrate.

[0050] In step S60 , the laser of the laser selective melting 3D printing device performs 3D printing according to the preset two-dimensional code image and the position information of the carrier plate 110 to form a three-dimensional two-dimensional code molding structure on each carrier plate 110 .

[0051] Among them, the preset two-dimensional code image is designed by computer software as needed. Specifically, the laser selective melting 3D printing device moves the laser to the top of the current carrier plate 110 according to the position information of each carrier plate 110. At this time, the laser performs 3D printing on the carrier plate 110 according to the preset two-dimensional code image. After the two-dimensional code forming structure is completed, the laser is moved to the top of the next carrier plate 110 and performs 3D printing, and so on, until the forming work of the two-dimensional code forming structure is completed on all carrier plates 110.

[0052] In step S70 , the carrying plate 110 is removed from the substrate to obtain a three-dimensional metal two-dimensional code 100 formed by the carrying plate 110 and the two-dimensional code forming structure.

[0053] It should be noted that the two-dimensional code forming structure formed on the carrier plate 110 by the laser selective melting 3D printing device through the laser selective melting technology forms a whole with the carrier plate 110 .

[0054] Specifically, after step S60 and before step S70, the method further includes taking the substrate out of the molding cavity to a preset position to facilitate the execution of step S70.

[0055] By executing the above steps S10 to S70, multiple three-dimensional metal two-dimensional codes 100 can be processed at one time, and batch processing of three-dimensional metal two-dimensional codes 100 can be achieved. Cutting metal components by wire cutting is very slow, so the processing efficiency of the metal two-dimensional code separation method by wire cutting in the prior art is very low. By executing the above steps S10 to S70, multiple three-dimensional metal two-dimensional codes 100 can be separated without wire cutting. Compared with wire cutting, the processing and separation of multiple three-dimensional metal two-dimensional codes 100 by disassembling the carrier plate 110 is faster, which greatly improves the batch processing efficiency of three-dimensional metal two-dimensional codes 100.

[0056] Moreover, before 3D molding, the position information of all the carrier plates 110 on the substrate is obtained by acquiring the environmental image of the carrier plate 110, and the laser performs 3D printing according to the position information of each carrier plate 110, and sequentially molds the two-dimensional code molding structure on each carrier plate 110 to ensure the processing accuracy of each three-dimensional metal two-dimensional code 100 and improve the quality of the product. Therefore, the above method of preparing metal two-dimensional codes using 3D printing equipment can improve the batch processing efficiency of three-dimensional metal two-dimensional codes 100 while ensuring high processing accuracy and high product quality.

[0057] In some embodiments, the steps for the laser to form a two-dimensional code forming structure on each carrier plate 110 are as follows: the laser selective melting 3D printing equipment selects three different sintering processes for zoned sintering to form a two-dimensional code forming structure on the carrier plate 110 including an outer protective shell 121, a core matrix 122 and a two-dimensional code body 123.

[0058] The outer protective shell 121 is formed on the carrier plate 110. The outer protective shell 121 has a receiving groove 1211 on the side facing away from the carrier plate 110. The core substrate 122 is formed at the bottom of the receiving groove 1211 and matches the receiving groove 1211. The two-dimensional code body 123 is a hollow structure formed on the core substrate 122 according to a preset two-dimensional code image. Therefore, the two-dimensional code forming structure is composed of three parts: the outer protective shell, the core body and the two-dimensional code body 123, which can effectively ensure the integrity of the three-dimensional metal two-dimensional code 100.

[0059] Among them, the density in the sintering process for forming the core matrix 122 is less than the density in the sintering process for forming the two-dimensional code body 123. In this way, the laser selective melting 3D printing device selects three different sintering processes to perform selective sintering on the carrier plate 110 to obtain the outer protective shell 121, the core matrix 122 and the two-dimensional code body 123 respectively, and makes the density of the core matrix 122 less than the density of the two-dimensional code body 123, so the structure of the core matrix 122 is looser than that of the two-dimensional code body 123, and this loose difference can form diffuse reflection of light, so that the core body and the two-dimensional code body 123 form a pixel difference, which is conducive to camera capture and improves the recognition of the three-dimensional metal two-dimensional code 100.

[0060] Further, in some embodiments, the sintering process for forming the peripheral protective shell 121 is: density greater than or equal to 90%, laser power of 100 watts to 500 watts, scanning speed of 800 mm / s to 2000 mm / s, and line spacing of 0.03 mm to 0.3 mm;

[0061] The sintering process for forming the core matrix 122 is: density of 60% to 80%, laser power of 100 W to 500 W, scanning speed of 800 mm / s to 2000 mm / s, and line spacing of 0.03 mm to 0.3 mm;

[0062] The sintering process for forming the two-dimensional code body 123 is: density greater than or equal to 99%, laser power of 100 watts to 500 watts, scanning speed of 800 mm / s to 2000 mm / s, and line spacing of 0.03 mm to 0.3 mm.

[0063] In this way, the density of the two-dimensional code body 123 is greater than the density of the outer protective shell 121, and the density of the outer protective shell 121 is greater than the density of the core matrix 122. This can not only effectively ensure that there is a large structural looseness difference between the two-dimensional code body 123 and the core matrix 122, which is beneficial to the improvement of the recognition of the three-dimensional metal two-dimensional code 100, but also ensure that the outer protective shell 121 is relatively hard and can effectively protect the two-dimensional code body 123, thereby extending the service life of the three-dimensional metal two-dimensional code 100.

[0064] Furthermore, in some embodiments, in a direction perpendicular to the carrier plate 110, the distance between the surface of the core substrate 122 facing away from the carrier plate and the surface of the peripheral protective shell 121 facing away from the carrier plate 110 is greater than the thickness of the two-dimensional code body 123. In this way, the peripheral protective shell 121 can completely protect the entire two-dimensional code body 123 in the receiving groove 1211, so that a height difference is formed between the side of the two-dimensional code body 123 facing away from the core substrate 122 and the opening edge of the receiving groove 1211, which can reduce the probability of the two-dimensional code body 123 being worn, etc., and is conducive to further extending the service life of the three-dimensional metal two-dimensional code 100.

[0065] Further, in some embodiments, the core substrate 122 and the two-dimensional code body 123 have different colors. Specifically, the outer protective shell 121, the core substrate 122 and the two-dimensional code body 123 have different colors.

[0066] For example, when the color of the core substrate 122 is white, the color of the two-dimensional code body 123 can be black. Of course, the color of the core substrate 122 and the color of the two-dimensional code body 123 can be selected from other colors with large color differences, such as yellow-green for the core substrate 122 and blue for the two-dimensional code body 123. In this way, a large color difference is ensured between the core substrate 122 and the two-dimensional code body 123, so as to facilitate the capture of the two-dimensional code pixels and make the three-dimensional metal two-dimensional code 100 more recognizable.

[0067] In some embodiments, step S30 includes: installing each supporting plate 110 on each installation station in a one-to-one corresponding and detachable manner by means of threaded connection.

[0068] Thus, when executing step S30, the detachable connection between each carrier plate 110 and the substrate can be realized by threaded connection, and the operation is convenient and simple. Moreover, when executing step S70, the threaded connection method makes the disassembly of each carrier plate 110 also convenient and quick. Therefore, the threaded connection method can further improve the separation speed of the three-dimensional metal two-dimensional code 100, and further improve the batch processing efficiency of the three-dimensional metal two-dimensional code 100.

[0069] Furthermore, in some embodiments, a plurality of mounting holes serving as mounting positions are provided on the substrate, wherein the mounting holes are multiple and may be threaded through holes, stepped through holes, smooth through holes, and the like.

[0070] The step S20 includes the steps of: machining the metal plate to obtain a plate body of a preset size; and opening a threaded blind hole 111 on one side of the plate body.

[0071] The steps of detachably mounting each supporting plate 110 on each installation station in a one-to-one correspondence manner by means of threaded connection are as follows: using a threaded fastener to pass through the installation hole and screw into the corresponding threaded blind hole 111 to detachably mount each supporting plate 110 on the corresponding substrate. The threaded fastener may be a bolt, a screw, a threaded rod, etc.

[0072] In this way, by screwing the threaded fasteners into the mounting holes and the corresponding threaded blind holes 111 in sequence from the side of the substrate facing away from the carrier plate 110, the installation of the carrier plate 110 on the substrate can be achieved. This is not only convenient and quick, but also can ensure the integrity of the side of the carrier plate 110 used for forming the QR code forming structure, which is conducive to improving the user experience of the three-dimensional metal QR code 100.

[0073] Furthermore, in some embodiments, after the step of passing the threaded fastener through the mounting hole and screwing it into the corresponding threaded blind hole 111 to detachably mount each carrier plate 110 on the substrate, the step further includes: rotating the carrier plate 110 so that the carrier plate 110 is placed in a preset placement posture. Specifically, the placement direction of each carrier plate 110 is adjusted by manually twisting the carrier plate 110 so that the carrier plate 110 is placed in a preset placement posture. In this way, the placement postures of all carrier plates 110 on the substrate can be ensured to be consistent.

[0074] Step S50 is: performing image recognition on the environment image to obtain the position information and placement direction information of each carrier plate 110 on the substrate. Since there is an error in adjusting the placement direction of the carrier plate 110 by manually rotating the carrier plate 110, accurate placement direction information of the carrier plate 110 can be obtained based on the environment image.

[0075] Step S60 is: the laser of the laser selective melting 3D printing device performs 3D printing according to the preset two-dimensional code image, the position information and the placement direction information of the carrier plate 110 to form a three-dimensional two-dimensional code molding structure on each carrier plate 110.

[0076] During the execution of step S60, the laser selective melting 3D printing equipment controls the laser to move to the specified position according to the position information of each carrier plate 110, and then controls the laser to adjust the forming direction according to the placement direction information of the carrier plate 110 at the specified position, so as to ensure that the forming directions of all two-dimensional code forming structures on the corresponding carrier plate 110 are consistent, thereby further improving the processing accuracy and product quality of the three-dimensional metal two-dimensional code 100.

[0077] In some embodiments, the orthographic projection of the two-dimensional code forming structure on the carrier plate 110 coincides with the surface of the carrier plate 110. Thus, the outer contour of the two-dimensional code forming structure is the same as the outer contour of the carrier plate 110, so as to avoid the carrier plate 110 protruding from the two-dimensional code forming structure, making the three-dimensional metal two-dimensional code 100 more regular, which is conducive to improving the user experience of the three-dimensional metal two-dimensional code 100.

[0078] Based on the same inventive concept, the present invention also provides a three-dimensional metal two-dimensional code 100, which is prepared by using the method for preparing a metal two-dimensional code using a 3D printing device provided in the above embodiment.

[0079] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0080] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for preparing a metal two-dimensional code using a 3D printing device, characterized in that: Includes steps: Providing a substrate having a plurality of installation stations arranged at intervals; Providing multiple metal bearing plates; Installing the supporting plates one by one and detachably on the installation stations; Positioning the substrate with the carrier plate installed in a molding cavity of a laser selective melting 3D printing device; Acquire an environmental image of all the carrier plates on the substrate, and perform image recognition on the environmental image to obtain position information of each carrier plate on the substrate; The laser of the laser selective melting 3D printing device performs 3D printing according to the preset two-dimensional code image and the position information of the carrier plate, so as to form a three-dimensional two-dimensional code forming structure on each of the carrier plates; the laser selective melting 3D printing device selects three different sintering processes for partitioned sintering, so as to form the two-dimensional code forming structure including an outer protective shell, a core matrix and a two-dimensional code body on the carrier plate; the density of the two-dimensional code body is greater than the density of the outer protective shell, and the density of the outer protective shell is greater than the density of the core matrix; The carrier plate is removed from the substrate to obtain a three-dimensional metal two-dimensional code formed by the carrier plate and the two-dimensional code forming structure; Among them, the outer protective shell is molded on the carrying plate, and the side of the outer protective shell facing away from the carrying plate has a accommodating groove, the core substrate is molded at the bottom of the accommodating groove and matches the accommodating groove, and the two-dimensional code body is a hollow structure molded on the core substrate according to the preset two-dimensional code image; the density in the sintering process used to mold the core substrate is less than the density of the sintering process used to mold the two-dimensional code body.

2. The method according to claim 1, characterized in that The step of detachably mounting each of the supporting plates on each of the installation stations in a one-to-one correspondence is as follows: detachably mounting each of the supporting plates on each of the installation stations in a one-to-one correspondence by means of threaded connection.

3. The method according to claim 2, characterized in that The substrate is provided with a plurality of mounting holes serving as the mounting stations; The step of providing a plurality of metal bearing plates comprises the steps of: machining the metal plate to obtain a plate body of a preset size; and opening a threaded blind hole on one side of the plate body; The steps of detachably mounting each of the supporting plates on each of the installation stations in a one-to-one correspondence by means of threaded connection are as follows: passing the threaded fastener through the installation hole and screwing it into the corresponding threaded blind hole to detachably mount each of the supporting plates on the base plate.

4. The method according to claim 3, characterized in that After the step of passing the threaded fastener through the mounting hole and screwing it into the corresponding threaded blind hole to detachably mount each of the carrier plates on the base plate, the method further includes the steps of: rotating the carrier plates so that the carrier plates are placed in a preset placement posture; The step of performing image recognition on the environment image to obtain the position information of each of the carrier plates on the substrate is: performing image recognition on the environment image to obtain the position information and placement direction information of each of the carrier plates on the substrate; The laser of the laser selective melting 3D printing device performs 3D printing according to the preset two-dimensional code image and the position information of the carrier plate to form a three-dimensional two-dimensional code molding structure on each of the carrier plates. The step is: the laser of the laser selective melting 3D printing device performs 3D printing according to the preset two-dimensional code image, the position information and the placement direction information of the carrier plate to form a three-dimensional two-dimensional code molding structure on each of the carrier plates.

5. The method according to claim 1, characterized in that In a direction perpendicular to the carrying plate, a distance between a surface of the core substrate facing away from the carrying plate and a surface of the peripheral protective shell facing away from the carrying plate is greater than a thickness of the two-dimensional code body.

6. The method according to claim 1, characterized in that The core substrate and the two-dimensional code body have different colors.

7. The method according to claim 1, characterized in that The orthographic projection of the two-dimensional code forming structure on the carrying plate coincides with the surface of the carrying plate.

8. A three-dimensional metal QR code, characterized in that: The three-dimensional metal two-dimensional code is formed by the method for preparing a metal two-dimensional code using a 3D printing device as described in any one of claims 1 to 7.

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