A jewelry mold slicing system and size control method based on laser 3D printing

Abstract

The application discloses a kind of based on laser 3D printing's jewelry mould slice system and size control method, involve jewelry mould printing technical field, this method includes: based on the characteristics of laser 3D printing, using 3D modeling software to design the 3D digital model of jewelry;The design features of jewelry include texture, the shape of cell, the size of cell and the angle of cell;After design is completed, the 3D digital model of jewelry is converted into 2D plane instruction that laser 3D printer can run by slice software, to realize the design freedom degree of jewelry geometry shape using laser 3D printing technology;According to the light projection image of jewelry in multiple directions, obtain the three-dimensional path reference data set in laser 3D printing process;Laser 3D printer is according to path reference data, based on 2D plane instruction, using laser selective melting printing technology to carry out laser 3D printing to jewelry mould.The application realizes the precision of 3D printing jewelry mould is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of jewelry mold printing, in particular to a jewelry mold slicing system based on laser 3D printing and a size control method. BACKGROUND

[0002] The existing jewelry molds generally include gypsum molds and metal molds, etc. However, the existing mold processing technology has complex steps and low precision, and needs post-grinding and a long processing cycle.

[0003] Therefore, the technology of using 3D printing jewelry molds appears. However, the understanding and technical proficiency of the operator of the 3D printer on the 3D printing process will affect the printing quality precision, thereby often leading to the technical problem that the technology of using 3D printing jewelry molds has low printing precision and the structure of the printed jewelry mold has a large deviation from the design drawing.

[0004] At present, no effective solution has been proposed for the above problems. SUMMARY

[0005] The embodiments of the present application provide a jewelry mold slicing system based on laser 3D printing and a size control method to solve the above technical problems.

[0006] The present application provides a jewelry mold slicing system based on laser 3D printing, which includes a 3D digital model design unit of jewelry, a laser 3D printer instruction conversion unit, a path reference data acquisition unit, a jewelry mold laser 3D printing unit, and a jewelry mold post-processing unit; wherein,

[0007] The 3D digital model design unit of jewelry is used to design the 3D digital model of jewelry based on the characteristics of laser 3D printing and the design characteristics of jewelry using 3D modeling software; wherein the characteristics of laser 3D printing include the need for support structures; and the design characteristics of jewelry include texture, shape of unit cell, size of unit cell, and angle of unit cell.

[0008] The laser 3D printer instruction conversion unit is used to convert the 3D digital model of jewelry into 2D plane instructions that can be run by the laser 3D printer after the design is completed through slicing software, so as to realize the design freedom of jewelry geometry using laser 3D printing technology.

[0009] The path reference data acquisition unit is used to obtain a three-dimensional path reference data set in the laser 3D printing process according to the obtained light projection images of the jewelry in multiple directions.

[0010] The jewelry mold laser 3D printing unit is configured to perform laser 3D printing on the jewelry mold based on the 2D plane instructions and using a laser selective melting printing technology according to the path reference data by the laser 3D printer.

[0011] The jewelry mold post-processing unit is configured to perform post-processing on the printed jewelry mold, and the post-processing includes removing the support structure, surface grinding, and polishing.

[0012] Further, the conversion of the 3D digital model of the jewelry into 2D plane instructions executable by the laser 3D printer by the slicing software includes:

[0013] The 3D digital model of the jewelry is decomposed into layer-by-layer 2D plane instructions by the slicing software to provide path planning guidance for the laser 3D printing process of the jewelry mold.

[0014] Further, the jewelry mold slicing system based on laser 3D printing further includes:

[0015] The printing parameter optimization unit is configured to optimize the printing parameters of the laser 3D printer according to the characteristics of the laser selective melting printing technology and the material used in the laser 3D printing before the laser 3D printer performs laser 3D printing on the jewelry mold based on the 2D plane instructions and using the laser selective melting printing technology according to the path reference data, and the printing parameters include exposure time, bottom exposure time, Z-axis lifting, and back-off speed.

[0016] The present application provides a size control method based on laser 3D printing, including: based on the characteristics of laser 3D printing, using 3D modeling software to design a 3D digital model of jewelry; wherein the characteristics of laser 3D printing include the need for a support structure; the design characteristics of the jewelry include texture, shape of unit cell, size of unit cell, and angle of unit cell;

[0017] After the design is completed, the 3D digital model of the jewelry is converted into 2D plane instructions executable by the laser 3D printer by the slicing software to realize the design freedom of the geometry of the jewelry using laser 3D printing technology;

[0018] According to the obtained light projection images of the jewelry in multiple directions, a three-dimensional path reference data set in the laser 3D printing process is obtained;

[0019] The laser 3D printer performs laser 3D printing on the jewelry mold based on the 2D plane instructions and using a laser selective melting printing technology according to the path reference data.

[0020] post-processing the printed jewelry mold; wherein the post-processing includes removing support structures, surface grinding, and polishing.

[0021] Further, the converting the 3D digital model of the jewelry into 2D plane instructions executable by the laser 3D printer by the slicing software includes:

[0022] Further, the converting the 3D digital model of the jewelry into 2D plane instructions executable by the laser 3D printer by the slicing software includes:

[0023] Further, the obtaining the three-dimensional path reference data set in the laser 3D printing process according to the obtained light projection images of the jewelry in multiple directions includes:

[0024] According to the obtained light projection images of the jewelry in multiple directions, determining a three-dimensional coordinate data array composed of key points of the jewelry;

[0025] Dividing data points in the three-dimensional coordinate data array into a first number of printing interval segments along the z-axis direction, and dividing data points in the three-dimensional coordinate data array into a second number of printing interval segments along the y-axis direction;

[0026] According to the size of the x-axis direction coordinate value of the data points in the three-dimensional coordinate data array, sorting the printing interval segments to obtain three-dimensional path reference sorting data;

[0027] According to the sorting of each printing interval segment in the three-dimensional path reference sorting data, sequentially judging whether the data points in each printing interval segment are endpoints of continuous straight line segments or continuous curve segments;

[0028] If the data points in the interval segment are endpoints of continuous straight line segments or continuous curve segments, the data points are added to the three-dimensional path reference data set.

[0029] Further, if the data points in the interval segment are endpoints of continuous straight line segments or continuous curve segments, the data points are added to the three-dimensional path reference data set, including the following four cases:

[0030] If |value_z(i)-value_z(i-1)|=K1 and |value_z(i)-value_z(i+1)|≠K1, the ith data point is added to the three-dimensional path reference data set as concave-convex reference data.

[0031] If |value_z(i)-value_z(i-1)|≠K1 and |value_z(i)-value_z(i+1)|=K1, the ith data point is added to the three-dimensional path reference data set as the concave-convex reference data;

[0032] If |value_y(i)-value_y(i-1)|=K2 and |value_y(i)-value_y(i+1)|≠K2, the ith data point is added to the three-dimensional path reference data set as the shape reference data;

[0033] If |value_y(i)-value_y(i-1)|≠K2 and |value_y(i)-value_y(i+1)|=K2, the ith data point is added to the three-dimensional path reference data set as the shape reference data;

[0034] wherein, value_z(i) is the coordinate value of the ith data point in the interval segment in the z-axis direction; value_z(i-1) is the coordinate value of the (i-1)th data point in the z-axis direction; value_z(i+1) is the coordinate value of the (i+1)th data point in the z-axis direction; K1 is the length of the line segment between adjacent two points on the continuous straight line segment or the continuous curve segment in the z-axis direction; value_y(i) is the coordinate value of the ith data point in the interval segment in the y-axis direction; value_y(i-1) is the coordinate value of the (i-1)th data point in the y-axis direction; value_y(i+1) is the coordinate value of the (i+1)th data point in the y-axis direction; K2 is the length of the line segment between adjacent two points on the continuous straight line segment or the continuous curve segment in the y-axis direction.

[0035] Further, the laser 3D printer performs laser 3D printing on the jewelry mold based on the 2D plane instruction and using the laser selective melting printing technology according to the path reference data, comprising:

[0036] The laser 3D printer calculates the original path of laser 3D printing of the jewelry mold based on the 2D plane instruction using the continuous Fermat spiral filling algorithm;

[0037] The laser 3D printer corrects the original path of laser 3D printing of the jewelry mold calculated to obtain a corrected path according to the concave-convex reference data and the shape reference data in the three-dimensional path reference data set;

[0038] The laser 3D printer performs laser 3D printing on the jewelry mold based on the corrected path using the laser selective melting printing technology to control the size of the printed jewelry mold.

[0039] Further, before the laser 3D printer prints the jewelry mold based on the 2D plane instruction according to the path reference data by using the laser selective melting printing technology, the method further comprises:

[0040] According to the laser selective melting printing technology and the characteristics of the material used when performing the laser 3D printing, the printing parameters of the laser 3D printer are optimized; wherein the printing parameters include exposure time, bottom exposure time, Z-axis lifting and back-off speed.

[0041] Further, before the laser 3D printer prints the jewelry mold based on the 2D plane instruction according to the path reference data by using the laser selective melting printing technology, the method further comprises:

[0042] According to the requirements of the jewelry mold and the cost budget, the material used when performing the laser 3D printing is determined from precious metals, resins, polymers and ceramic composite materials.

[0043] Based on the characteristics of laser 3D printing, the 3D digital model of the jewelry is designed using 3D modeling software based on the embodiments provided in the present application; the design features of the jewelry include texture, shape of unit cell, size of unit cell and angle of unit cell; after the design is completed, the 3D digital model of the jewelry is converted into 2D plane instruction that can be run by the laser 3D printer through slicing software, so as to realize the design freedom of the geometry of the jewelry by using the laser 3D printing technology; according to the obtained light projection images of the jewelry in multiple directions, the three-dimensional path reference data set in the laser 3D printing process is obtained; the laser 3D printer prints the jewelry mold based on the 2D plane instruction according to the path reference data by using the laser selective melting printing technology; the printed jewelry mold is post-processed. The jewelry mold is automatically printed by 2D plane instruction combined with path reference data, so as to realize the improvement of the accuracy of the 3D printed jewelry mold, the structure of the printed jewelry mold is consistent with the design drawing, and the size control of the printed jewelry mold is realized.

[0044] Specifically, design freedom: 3D modeling software allows designers to create complex and intricate jewelry designs, including unique textures, cell shapes, sizes, and angles. This design freedom is difficult to achieve with traditional manufacturing techniques; precision: 3D modeling software can precisely control the details of jewelry designs, ensuring that each design element meets the designer's intentions; rapid prototyping: after the design is completed, the slicing software can convert the 3D model into 2D plane instructions that the laser printer can understand, which makes the conversion process from design to prototype faster and more efficient; reduce material waste: laser 3D printing technology builds jewelry molds layer by layer, which can significantly reduce material waste compared to traditional subtractive manufacturing; improve production efficiency: laser 3D printing technology can achieve automated production, reducing manual intervention and improving production efficiency; manufacturing of complex structures: laser 3D printing technology can manufacture complex internal structures that are difficult to achieve with traditional processes, providing more possibilities for jewelry design; customized production: laser 3D printing technology can quickly adjust the design according to customer needs to achieve personalized customization; quality control: the quality of the jewelry mold obtained by laser 3D printing is more consistent, which helps to improve the quality of the final product. BRIEF DESCRIPTION OF DRAWINGS

[0045] The drawings described herein are intended to provide a further understanding of the embodiments of the present application, form a part of the application, and the illustrative embodiments of the present application and their descriptions are used to explain the present application, and do not constitute improper limitations on the present application. In the drawings:

[0046] Figure 1 A structure diagram of an optional laser 3D printing-based jewelry mold slicing system according to an embodiment of the present application;

[0047] Figure 2 A flowchart of an optional laser 3D printing-based size control method according to an embodiment of the present application.

[0048] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0049] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application.

[0050] Optionally, as shown in Figure 1 The present application provides a laser 3D printing-based jewelry mold slicing system, which comprises a 3D digital model design unit 101 of jewelry, a laser 3D printer instruction conversion unit 102, a path reference data acquisition unit 103, a jewelry mold laser 3D printing unit 104 and a jewelry mold post-processing unit 105; wherein,

[0051] The 3D digital model design unit 101 is used for designing the 3D digital model of the jewelry based on the characteristics of laser 3D printing and the design characteristics of the jewelry using 3D modeling software; wherein the characteristics of laser 3D printing include the need for support structures; the design characteristics of the jewelry include texture, the shape of the unit cell, the size of the unit cell, and the angle of the unit cell;

[0052] The laser 3D printer instruction conversion unit 102 is used for converting the 3D digital model of the jewelry into 2D plane instructions that the laser 3D printer can run after the design is completed, so as to realize the design freedom of the geometry of the jewelry by using laser 3D printing technology;

[0053] The path reference data acquisition unit 103 is used for obtaining a set of three-dimensional path reference data in the laser 3D printing process according to the obtained light projection images of the jewelry in multiple directions;

[0054] The jewelry mold laser 3D printing unit 104 is used for the laser 3D printer to perform laser 3D printing on the jewelry mold based on the 2D plane instructions by using laser selective melting printing technology according to the path reference data;

[0055] The jewelry mold post-processing unit 105 is used for post-processing the printed jewelry mold; wherein the post-processing includes removing the support structure, surface grinding, and polishing.

[0056] Further, converting the 3D digital model of the jewelry into 2D plane instructions that the laser 3D printer can run by using the slicing software includes:

[0057] Decomposing the 3D digital model of the jewelry into layer-by-layer 2D plane instructions by using the slicing software to provide path planning guidance for the laser 3D printing process of the jewelry mold.

[0058] Further, the laser 3D printing-based jewelry mold slicing system further includes:

[0059] The printing parameter optimization unit is used for optimizing the printing parameters of the laser 3D printer before the laser 3D printer performs laser 3D printing on the jewelry mold based on the 2D plane instructions by using laser selective melting printing technology according to the characteristics of the laser selective melting printing technology and the materials used during the laser 3D printing; wherein the printing parameters include exposure time, bottom exposure time, Z-axis lifting, and back-off speed.

[0060] Optionally, as shown in Figure 2 The present application provides a size control method based on laser 3D printing, which includes:

[0061] S201, based on the characteristics of laser 3D printing, using 3D modeling software to design the 3D digital model of the jewelry; wherein the characteristics of laser 3D printing include the need for support structure; the design features of the jewelry include texture, shape of the unit cell, size of the unit cell and angle of the unit cell;

[0062] S202, after the design is completed, the 3D digital model of the jewelry is converted into 2D plane instructions that can be run by the laser 3D printer through the slicing software, so as to realize the design freedom of the geometry of the jewelry by using the laser 3D printing technology;

[0063] S203, according to the light projection images of the jewelry in multiple directions, the three-dimensional path reference data set in the laser 3D printing process is obtained;

[0064] S204, the laser 3D printer prints the jewelry mold by laser 3D printing based on the 2D plane instructions according to the path reference data by using the laser selective melting printing technology;

[0065] S205, post-processing the printed jewelry mold; wherein the post-processing includes removing the support structure, surface grinding and polishing.

[0066] Based on the embodiments provided in the present application, based on the characteristics of laser 3D printing, using 3D modeling software to design the 3D digital model of the jewelry; the design features of the jewelry include texture, shape of the unit cell, size of the unit cell and angle of the unit cell; after the design is completed, the 3D digital model of the jewelry is converted into 2D plane instructions that can be run by the laser 3D printer through the slicing software, so as to realize the design freedom of the geometry of the jewelry by using the laser 3D printing technology; according to the light projection images of the jewelry in multiple directions, the three-dimensional path reference data set in the laser 3D printing process is obtained; the laser 3D printer prints the jewelry mold by laser 3D printing based on the 2D plane instructions according to the path reference data by using the laser selective melting printing technology; the printed jewelry mold is post-processed. By using 2D plane instructions combined with path reference data to print the jewelry mold, the accuracy of printing the jewelry mold by 3D printing is improved, the structure of the printed jewelry mold is consistent with the design drawing, and the size of the printed jewelry mold is controlled.

[0067] Specifically, design freedom: 3D modeling software allows designers to create complex and intricate jewelry designs, including unique textures, cell shapes, sizes, and angles. This design freedom is difficult to achieve with traditional manufacturing techniques; precision: 3D modeling software can precisely control the details of jewelry designs, ensuring that each design element meets the designer's intentions; rapid prototyping: after the design is completed, the slicing software can convert the 3D model into 2D plane instructions that the laser printer can understand, making the conversion process from design to prototype faster and more efficient; reduce material waste: laser 3D printing technology builds jewelry molds layer by layer, which can significantly reduce material waste compared to traditional subtractive manufacturing; improve production efficiency: laser 3D printing technology can achieve automated production, reducing manual intervention and improving production efficiency; manufacturing of complex structures: laser 3D printing technology can manufacture complex internal structures that are difficult to achieve with traditional processes, providing more possibilities for jewelry design; customized production: laser 3D printing technology can quickly adjust the design according to customer needs to achieve personalized customization; quality control: jewelry molds obtained by laser 3D printing have more consistent quality, which helps to improve the quality of the final product.

[0068] Further, the 3D digital model of the jewelry is converted into 2D plane instructions that the laser 3D printer can run by slicing software, including:

[0069] The 3D digital model of the jewelry is decomposed into layer-by-layer 2D plane instructions by slicing software to provide path planning guidance for the laser 3D printing process of the jewelry mold.

[0070] Further, according to the obtained light projection images of the jewelry in multiple directions, a set of three-dimensional path reference data is obtained during the laser 3D printing process, including:

[0071] According to the obtained light projection images of the jewelry in multiple directions, determine the three-dimensional coordinate data array composed of key points of the jewelry;

[0072] Divide the data points in the three-dimensional coordinate data array into a first number of printing interval segments along the z-axis direction, and divide the data points in the three-dimensional coordinate data array into a second number of printing interval segments along the y-axis direction;

[0073] Sort the printing interval segments according to the x-axis direction coordinate values of the data points in the three-dimensional coordinate data array to obtain three-dimensional path reference sorting data;

[0074] According to the sorting of each printing interval segment in the three-dimensional path reference sorting data, sequentially determine whether the data points in each printing interval segment are endpoints of continuous straight line segments or continuous curve segments;

[0075] If the data point in the interval segment is the endpoint of a continuous straight line segment or a continuous curve segment, the data point is added to the three-dimensional path reference data set.

[0076] Based on the embodiments provided in the present application, the following beneficial effects are achieved: accurate path planning: by decomposing the 3D model into layer-by-layer 2D plane instructions, accurate path planning guidance is provided for the laser 3D printing process, ensuring the accuracy and consistency of the printing process; optimized printing efficiency: the generation of the three-dimensional path reference data set enables the printing process to be more efficient, as the printer can quickly determine the printing order and path according to these data; improved printing quality: by analyzing the light projection images of the jewelry in multiple directions, the key points and three-dimensional coordinate data of the jewelry can be more accurately determined, enabling more detailed detail processing during the printing process; reduced printing errors: by determining whether the data point is the endpoint of a continuous straight line segment or a curve segment, printing errors and unnecessary waste of printing materials can be reduced; enhanced printing flexibility: by dividing the printing interval segment along the z-axis and y-axis directions, and sorting according to the x-axis direction coordinate value, the printing process can be flexibly adjusted to adapt to jewelry designs of different complexity and size; complex structure printing: through accurate three-dimensional path planning, laser 3D printing technology can realize the printing of complex jewelry structures, including internal structures and external decorations.

[0077] Further, if the data point in the interval segment is the endpoint of a continuous straight line segment or a continuous curve segment, the data point is added to the three-dimensional path reference data set, including the following four cases:

[0078] If |value_z(i)-value_z(i-1)|=K1 and |value_z(i)-value_z(i+1)|≠K1, the ith data point is added as concave-convex reference data to the three-dimensional path reference data set;

[0079] If |value_z(i)-value_z(i-1)|≠K1 and |value_z(i)-value_z(i+1)|=K1, the ith data point is added as concave-convex reference data to the three-dimensional path reference data set;

[0080] If |value_y(i)-value_y(i-1)|=K2 and |value_y(i)-value_y(i+1)|≠K2, the ith data point is added as shape reference data to the three-dimensional path reference data set;

[0081] If |value_y(i)-value_y(i-1)|≠K2 and |value_y(i)-value_y(i+1)|=K2, the ith data point is added to the three-dimensional path reference data set as shape reference data;

[0082] wherein, value_z(i) is the coordinate value of the ith data point in the interval segment in the z-axis direction; value_z(i-1) is the coordinate value of the (i-1)th data point in the z-axis direction; value_z(i+1) is the coordinate value of the (i+1)th data point in the z-axis direction; K1 is the length of the line segment between the adjacent two points on the continuous straight line segment or the continuous curve segment in the z-axis direction; value_y(i) is the coordinate value of the ith data point in the interval segment in the y-axis direction; value_y(i-1) is the coordinate value of the (i-1)th data point in the y-axis direction; value_y(i+1) is the coordinate value of the (i+1)th data point in the y-axis direction; K2 is the length of the line segment between the adjacent two points on the continuous straight line segment or the continuous curve segment in the y-axis direction.

[0083] Further, the laser 3D printer performs laser 3D printing on the jewelry mold based on the 2D plane instruction according to the path reference data by using a laser selective melting printing technology, comprising:

[0084] The laser 3D printer calculates the original path of laser 3D printing of the jewelry mold based on the 2D plane instruction by using a continuous Fermat spiral filling algorithm;

[0085] The laser 3D printer corrects the original path of laser 3D printing of the jewelry mold calculated according to the concave-convex reference data and the shape reference data in the three-dimensional path reference data set to obtain a corrected path;

[0086] The laser 3D printer performs laser 3D printing on the jewelry mold based on the corrected path by using a laser selective melting printing technology to control the size of the printed jewelry mold.

[0087] Based on the embodiments provided in the present application, the following beneficial effects are achieved: the laser 3D printer uses laser selective melting printing technology to 3D print the jewelry mold, and combines the continuous Fermat spiral filling algorithm and the three-dimensional path reference data set to correct the path, which has the following beneficial effects: improving printing efficiency: the continuous Fermat spiral filling algorithm optimizes the printing path, reduces the idle stroke of the print head, and thus improves the printing efficiency; ensuring printing quality: the path optimized by the algorithm can reduce the interlayer discontinuity in the printing process, ensuring that the printed jewelry mold surface is smooth and uniform; accurately controlling the size: the printing process based on the corrected path can more accurately control the size of the jewelry mold to meet the design requirements; enhancing printing details: the use of the three-dimensional path reference data set enables the printer to better handle the concave-convex and shape details of the jewelry mold; reducing support structures: the optimized path algorithm may reduce the need for support structures, simplifying the printing process and reducing the complexity of post-processing; improving printing precision: the calculation of the corrected path takes into account the specific shape and features of the jewelry mold, improving the printing precision; improving the utilization of printing materials: through accurate path planning, printing materials can be more effectively utilized, reducing waste.

[0088] Further, before the laser 3D printer performs laser 3D printing on the jewelry mold based on the path reference data and 2D plane instructions using laser selective melting printing technology, the method further comprises:

[0089] According to the characteristics of the laser selective melting printing technology and the materials used when performing laser 3D printing, the printing parameters of the laser 3D printer are optimized; wherein the printing parameters include exposure time, bottom exposure time, Z-axis lifting and back-off speed.

[0090] Further, before the laser 3D printer performs laser 3D printing on the jewelry mold based on the path reference data and 2D plane instructions using laser selective melting printing technology, the method further comprises:

[0091] According to the requirements of the jewelry mold and the cost budget, the materials used when performing laser 3D printing are determined from precious metals, resins, polymers and ceramic composites.

[0092] It should be noted that the embodiments implemented by the jewelry mold slicing system based on laser 3D printing provided in the present application can refer to the embodiments implemented by the size control method based on laser 3D printing, and the present application will not be repeated.

[0093] The above is only a preferred embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent flow transformation made by utilizing the content of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A laser 3D printing based jewelry mold slicing system, characterized in that, The system comprises: a 3D digital model design unit for designing a 3D digital model of jewelry based on the characteristics of laser 3D printing and the design characteristics of the jewelry using 3D modeling software; a laser 3D printer instruction conversion unit for converting the 3D digital model of the jewelry into 2D plane instructions that can be run by the laser 3D printer after the design is completed through slicing software, and for decomposing the 3D digital model of the jewelry into layer-by-layer 2D plane instructions through slicing software to provide path planning guidance for the laser 3D printing process of the jewelry mold; a path reference data acquisition unit for obtaining a set of three-dimensional path reference data in the laser 3D printing process according to the obtained light projection images of the jewelry in multiple directions; a jewelry mold laser 3D printing unit for the laser 3D printer to perform laser 3D printing on the jewelry mold based on the 2D plane instructions according to the path reference data using laser selective melting printing technology; a jewelry mold post-processing unit for post-processing the printed jewelry mold; wherein the post-processing includes removing support structures, surface grinding, and polishing; According to the obtained light projection images of the jewelry in multiple directions, a set of three-dimensional path reference data in the laser 3D printing process is obtained, including: According to the obtained light projection images of the jewelry in multiple directions, determine the three-dimensional coordinate data array composed of key points of the jewelry; Divide the data points in the three-dimensional coordinate data array into a first number of printing interval segments along the z-axis direction, and divide the data points in the three-dimensional coordinate data array into a second number of printing interval segments along the y-axis direction; Sort the printing interval segments according to the size of the x-axis direction coordinate values of the data points in the three-dimensional coordinate data array to obtain three-dimensional path reference sorting data; According to the sorting of each printing interval segment in the three-dimensional path reference sorting data, judge whether the data points in each printing interval segment are end points of continuous straight line segments or continuous curve segments in turn; If the data point in the interval segment is the end point of the continuous straight line segment or the continuous curve segment, add the data point to the three-dimensional path reference data set; If the data point in the interval segment is the end point of the continuous straight line segment or the continuous curve segment, add the data point to the three-dimensional path reference data set, including the following four cases: If And the ith data point is added to the three-dimensional path reference data set as concave-convex reference data; If And the ith data point is added to the three-dimensional path reference data set as concave-convex reference data; If And then the ith data point is added to the three-dimensional path reference data set as shape reference data; If And then the ith data point is added to the three-dimensional path reference data set as shape reference data; wherein, is a coordinate value of the i-th data point in the direction of the axis; is a coordinate value of the i-th data point in the direction of the axis; is a coordinate value of the i-th data point in the direction of the axis; is a coordinate value of the i-th data point in the direction of the axis; is a coordinate value of the i-th data point in the direction of the axis; is a length of a line segment between two adjacent points on the continuous straight line segment or the continuous curve segment projected on the axis; is a coordinate value of the i-th data point in the direction of the axis; is a coordinate value of the i-th data point in the direction of the axis; is a coordinate value of the i-th data point in the direction of the axis; is a coordinate value of the i-th data point in the direction of the axis; is a coordinate value of the i-th data point in the direction of the axis; is a length of a line segment between two adjacent points on the continuous straight line segment or the continuous curve segment projected on the axis.​​​​​​​​​​ 2. The laser 3D printing based jewelry mold slicing system of claim 1, wherein, The laser 3D printing-based jewelry mold slicing system further comprises: a printing parameter optimization unit for optimizing the printing parameters of the laser 3D printer according to the characteristics of the laser selective melting printing technology and the materials used during laser 3D printing before the laser 3D printer performs laser 3D printing on the jewelry mold based on the 2D plane instructions according to the path reference data using laser selective melting printing technology; wherein the printing parameters include exposure time, Z-axis lifting, and back-off speed.

3. A method for size control based on laser 3D printing, the method being implemented based on the system as claimed in claim 1, characterized by, Based on the characteristics of laser 3D printing, a 3D digital model of jewelry is designed using 3D modeling software; wherein the characteristics of laser 3D printing include the need for support structures; and the design characteristics of the jewelry include texture, shape of unit cells, size of unit cells, and angle of unit cells; ​ After the design is completed, the 3D digital model of the jewelry is converted into 2D plane instructions capable of running on a laser 3D printer by slicing software, so as to realize the design freedom of jewelry geometry by laser 3D printing technology; According to the obtained light projection images of the jewelry in multiple directions, a three-dimensional path reference data set in the laser 3D printing process is obtained; The laser 3D printer performs laser 3D printing on the jewelry mold based on the 2D plane instructions according to the path reference data by using laser selective melting printing technology; The printed jewelry mold is post-processed; wherein the post-processing includes removing the support structure, surface grinding and polishing.

4. The laser 3D printing based size control method according to claim 3, characterized in that, The 3D digital model of the jewelry is converted into 2D plane instructions capable of running on a laser 3D printer by slicing software, including: The 3D digital model of the jewelry is decomposed into layer-by-layer 2D plane instructions by the slicing software to provide path planning guidance for the laser 3D printing process of the jewelry mold.

5. The laser 3D printing based size control method according to claim 4, characterized in that, According to the obtained light projection images of the jewelry in multiple directions, a three-dimensional path reference data set in the laser 3D printing process is obtained, including: According to the obtained light projection images of the jewelry in multiple directions, the three-dimensional coordinate data array composed of key points of the jewelry is determined; The data points in the three-dimensional coordinate data array are divided into a first number of printing interval segments along the z-axis direction, and the data points in the three-dimensional coordinate data array are divided into a second number of printing interval segments along the y-axis direction; The printing interval segments are sorted according to the x-axis direction coordinate values of the data points in the three-dimensional coordinate data array to obtain three-dimensional path reference sorting data; According to the sorting of each printing interval segment in the three-dimensional path reference sorting data, it is judged in turn whether the data points in each printing interval segment are end points of continuous straight line segments or continuous curve segments; If the data points in the interval segment are end points of continuous straight line segments or continuous curve segments, the data points are added to the three-dimensional path reference data set.

6. The laser 3D printing based size control method according to claim 5, characterized in that, If the data points in the interval segment are end points of continuous straight line segments or continuous curve segments, the data points are added to the three-dimensional path reference data set, including the following four cases: If and then the ith data point is added to the set of three-dimensional path reference data as concave-convex reference data. If and then the ith data point is added to the three-dimensional path reference data set as the concave-convex reference data. If and then the ith data point is added to the set of three-dimensional path reference data as shape reference data; If And then the ith data point is added to the set of three-dimensional path reference data as the shape reference data. in, The first segment in the interval Data points in Coordinate values ​​along the axis; For the first The data points in Coordinate values ​​along the axis; For the first The data points in Coordinate values ​​along the axis; For a line segment between two adjacent points on a continuous straight line segment or a continuous curved line segment, The length of the projection onto the axis; The first segment in the interval The data points in Coordinate values ​​along the axis; For the first The data points in Coordinate values ​​along the axis; For the first The data points in Coordinate values ​​along the axis; For a line segment between two adjacent points on a continuous straight line segment or a continuous curved line segment, The length of the projection onto the axis.

7. The laser 3D printing based size control method according to claim 6, characterized in that, The laser 3D printer performs laser 3D printing on the jewelry mold based on the 2D plane instructions according to the path reference data by using laser selective melting printing technology, including: The laser 3D printer calculates the original path of laser 3D printing of the jewelry mold based on the 2D plane instructions by using a continuous Fermat spiral filling algorithm; The laser 3D printer corrects the calculated original path of laser 3D printing of the jewelry mold according to the concave-convex reference data and the shape reference data in the three-dimensional path reference data set to obtain a corrected path; The laser 3D printer performs laser 3D printing on the jewelry mold based on the corrected path by using the laser selective melting printing technology to control the size of the printed jewelry mold.

8. The laser 3D printing based size control method according to claim 7, characterized in that, Before the laser 3D printer prints the jewelry mold based on the 2D planar instructions according to the path reference data by using the laser selective melting printing technology, the method further comprises: According to the laser selective melting printing technology and the characteristics of the material used when the laser 3D printing is performed, the printing parameters of the laser 3D printer are optimized, wherein the printing parameters include exposure time, Z-axis lifting and back-off speed.

9. The laser 3D printing based size control method according to claim 8, characterized in that, Before the laser 3D printer prints the jewelry mold based on the 2D planar instructions according to the path reference data by using the laser selective melting printing technology, the method further comprises: According to the requirements of the jewelry mold and the cost budget, the material used when the laser 3D printing is performed is determined from precious metals, polymers and ceramic composite materials.

Images