Photocuring 3D printing method and photocuring 3D printing piece

Abstract

The invention relates to the technical field of 3D printing, and provides a photocuring 3D printing method and a photocuring 3D printed piece, and the photocuring 3D printing method comprises the steps that a supporting unit and a target object are formed; wherein the supporting unit comprises a covering part, and the covering part is made of a first material; the target object comprises a target surface, the covering part completely covers the target surface, the target object is at least composed of a second material, and the second material is different from the first material; and chemically eroding the covering part to obtain the target object. According to the photocuring 3D printing method, the covering part completely covers the target surface, that is, the supporting unit and the target object are in surface contact, after the covering part is dissolved and removed, the target object with the smooth target surface can be obtained, connection points between the supporting unit and the target object are avoided, and the printing quality is improved. The target surface of the target object is prevented from leaving recesses or salient points; and the workload of subsequent secondary processing can be saved, and the working efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of 3D printing technology, and in particular to a photocuring 3D printing method and a photocuring 3D printed part. Background Art

[0002] 3D printing technology is to manufacture three-dimensional entities by layering through 3D printing equipment based on the three-dimensional model data of the target object. 3D printing technology can overcome special structural obstacles that cannot be achieved by traditional mechanical processing and realize the simplified production of any complex structural parts. Current 3D printing technologies include Stereo Lithography Appearance (SLA), Digital Light Processing (DLP), Liquid Crystal Display (LCD), Fused Deposition Modeling (FDM), Selective Laser Sintering (SLS), etc.

[0003] The slicing of three-dimensional data is an indispensable part of the 3D printing technology of photocuring. The method is to horizontally slice the three-dimensional model data along the Z-axis direction according to the set layer thickness, obtain the cross-sectional data of each layer, and then perform photocuring layer by layer according to the cross-sectional data, thereby realizing the 3D printing process of photocuring.

[0004] like Figure 1 As shown, the target object 22 is a sphere. When printing using DLP, for example, a support element 21 (such as Figure 1 The target object 22 is supported by the rod member 21 to ensure that the target object 22 remains stable during the printing process; after printing is completed, the supporting element 21 needs to be removed to obtain the target object 22.

[0005] The existing method of removing the support element includes: in one scenario, providing a rod-shaped support element composed of a water-soluble material, and after solidifying to form a target object, dissolving the support element by water to obtain the target object; wherein the rod-shaped support element is conducive to saving materials. It can be understood that the target object to be formed usually has an uneven surface in contact with the support element, or even a surface with a complex morphology; in order to ensure that the support element supports the target object well, the rod-shaped support element is embedded in the print, so that after the support element is dissolved and removed, a depression is left on the surface of the target object, for example, the depression is recessed by 0.5 to 1 slice layer thickness. In another scenario, the rod-shaped support element is made of a non-water-soluble material and is removed by cutting. In order to avoid scratching the surface of the target object, the cutting position is at a certain distance from the surface of the target object, resulting in convex points on the surface of the target object, for example, the convex points protrude by 0.5 to 1 slice layer thickness. In order to improve the surface quality of the target object, both of the above methods require post-processing of the surface of the target object after photocuring printing (for example, filling depressions and polishing convex points), but when the surface quality requirements of the target object are high, the above post-processing methods still cannot meet the requirements. Summary of the invention

[0006] In view of this, the embodiments of the present application provide a light-curing 3D printing method and a light-curing 3D printed part to solve the problem that depressions or protrusions are left on the surface of the target object after the support element is removed.

[0007] The first aspect of the present application proposes a photocuring 3D printing method, comprising: forming a support unit and a target object; wherein the support unit includes a covering portion, the covering portion is composed of a first material; the target object includes a target surface, the covering portion completely covers the target surface, the target object is composed of at least a second material, and the second material is different from the first material; chemically etching the covering portion to obtain the target object.

[0008] The beneficial effects of the photocuring 3D printing method provided in the embodiment of the present application are as follows: the target surface is completely covered by the covering part, that is, the support unit and the target object are in surface contact, and after the covering part is dissolved and removed, a target object with a smooth target surface can be obtained, thereby avoiding the appearance of connection "points" between the support unit and the target object, and further avoiding depressions or protrusions on the target surface of the target object; the workload of subsequent secondary processing (filling depressions, polishing protrusions) can be saved, thereby improving work efficiency.

[0009] In some embodiments, the supporting unit further includes a plurality of supporting elements spaced apart from each other, wherein the covering portion is formed between the target object and the plurality of supporting elements.

[0010] The beneficial effect of adopting the above technical solution is that the multiple supporting elements are spaced apart from each other, so that the structure of the supporting elements is relatively simple, which is conducive to printing, thereby improving printing efficiency. The supporting elements are in the form of rods or frames, for example.

[0011] In some embodiments, the cover portion has a uniform or substantially uniform thickness.

[0012] In some embodiments, the cover portion has a non-uniform thickness.

[0013] In some embodiments, a thickness of the covering portion in a plurality of first regions corresponding to the plurality of support elements is greater than a thickness of the covering portion in a second region, wherein the second region does not overlap with the plurality of first regions.

[0014] The beneficial effects of adopting the above technical solution are as follows: the thickness of the covering part in the first area is relatively large, which can ensure the connection strength between the supporting element and the covering part, thereby ensuring that the supporting element stably supports the target object; since the cost of the first material that can be chemically corroded is relatively high, the thickness of the covering part in the second area is relatively small, which can reduce the use of the first material, thereby reducing costs.

[0015] In some embodiments, the thickness of the covering portion in the first region is 100 μm-300 μm, and / or the thickness of the covering portion in the second region is 20 μm-100 μm.

[0016] The beneficial effects of the above technical solution are as follows: the thickness of the first region is designed to be 100 μm-300 μm, and the thickness of the first region is not too large while ensuring the connection strength between the support element and the covering part; the thickness of the second region is designed to be 20 μm-100 μm, and the thickness of the second region is not too large while ensuring effective coverage of the target surface. Therefore, the material cost can be reduced.

[0017] In some embodiments, the support element is comprised of a third material that is different than the first material.

[0018] The beneficial effect of adopting the above technical solution is that since the cost of the first material that can be chemically corroded is relatively high, the support element is made of a third material that is different from the first material, which can reduce the cost.

[0019] In some embodiments, the target object is composed of at least two materials, and the at least two materials include the second material.

[0020] The beneficial effects of adopting the above technical solution are as follows: the target object is composed of at least two materials, which can meet the function, performance, appearance and other requirements of the target structure.

[0021] In some embodiments, in the vertical direction, the projection of the covering portion covers the projection of the target object.

[0022] The beneficial effects of adopting the above technical solution are as follows: after the covering part is dissolved and removed, when the target surface is the entire surface covered by the covering part, the target surface quality of the target object is excellent; when the target surface is the partial surface covered by the covering part, the target surface of the target object and the surface around the target surface are both of excellent quality.

[0023] In some embodiments, the first material is a water-soluble photosensitive resin, and chemically etching the covering portion includes: dissolving the covering portion using water.

[0024] The beneficial effect of adopting the above technical solution is that after the target object and the supporting unit are placed in water, the covering part composed of the water-soluble photosensitive resin will dissolve to obtain a target object with good surface quality.

[0025] In some embodiments, the first material is a hot-melt photosensitive resin, and the covering portion can be heated to melt the covering portion, thereby achieving removal of the covering portion.

[0026] The beneficial effect of adopting the above technical solution is that the covering part composed of the hot-melt photosensitive resin will melt when heated to obtain a target object with good surface quality.

[0027] In some embodiments, the target surface is uneven. The solution of the present application is particularly beneficial for target objects having uneven target surfaces.

[0028] In some embodiments, chemically etching the covering portion includes etching the covering portion using an acidic solvent (having a pH less than 7).

[0029] A second aspect of the present application provides a photocurable 3D printed part, which is printed using the photocurable 3D printing method as described in the first aspect.

[0030] The photocurable 3D printed part adopts any one or more embodiments of the above-mentioned photocurable 3D printing method, and thus has the beneficial effects of the above-mentioned embodiments, which will not be described one by one here.

[0031] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or conventional technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a schematic diagram of the structure of a support unit and a target object in the prior art;

[0034] Figure 2 is a flow chart of a light-curing 3D printing method provided in some embodiments of the present application;

[0035] Figure 3 is a schematic diagram of the structure of a support unit and a target object provided in some embodiments of the present application;

[0036] Figure 4 is a schematic diagram of the structure of a support unit and a target object provided in some other embodiments of the present application;

[0037] Figure 5 is a schematic diagram of the structure of a support unit and a target object provided in other embodiments of the present application;

[0038] Figure 6 is a schematic diagram of a structure in which the covering portion of the support unit does not completely cover the target surface;

[0039] Figure 7 is a schematic diagram of the structure of a support unit and a target object provided in some further embodiments of the present application;

[0040] Figure 8 is a schematic diagram of the structure of a target object provided by some embodiments of the present application;

[0041] Fig. 9 yes Figure 8 a bottom view of the target object shown;

[0042] Fig.10 It is a structural schematic diagram of layer-by-layer printing of the light-curing 3D printing method provided in some embodiments of the present application.

[0043] The meanings of the marks in the figure are:

[0044] 11. Support unit; 111. Support element; 1111. Support rod; 112. Covering portion; 1121. First area; 1122. Second area;

[0045] 12. target object; 120. bottom surface; 121. target surface;

[0046] 13. Light-emitting unit;

[0047] 14. Gap;

[0048] 15. Printing platform;

[0049] 21. Supporting elements;

[0050] 22. Target object. DETAILED DESCRIPTION

[0051] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0053] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0054] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0055] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0056] In the description of the embodiments of the present application, the orientation or position relationship indicated by the technical terms "length", "thickness", "vertical", "inside" and "outside" are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the embodiments of the present application.

[0057] The first embodiment of the present application provides a light-curing 3D printing method. Figure 2 and Figure 3 , light-curing 3D printing methods include:

[0058] S100, forming a support unit 11 and a target object 12; wherein the support unit 11 includes a covering portion 112, and the covering portion 112 is composed of a first material; the target object 12 includes a target surface 121, and the covering portion 112 completely covers the target surface 121, and the target object 12 is composed of at least a second material, and the second material is different from the first material.

[0059] Optionally, the support unit 11 and the target object 12 are formed by light irradiation.

[0060] The function of the covering portion 112 is to cover the target surface 121 to prevent the support unit 11 from leaving a depression or a convex point on the target surface 121 after the support unit 11 is removed. The shape of the covering portion 112 is not limited in this application, and it is designed according to the target surface 121 of the target object 12 (the purpose is to cover the target surface). For example, the covering portion 112 can be a curved structure, a folded line structure, a straight plate structure, and other structures.

[0061] The first material is not limited in the present application as long as it is photocurable and can be chemically eroded; for example, the first material can be a photocurable water-soluble material, an acid-soluble material, etc., or a photocurable hot-melt material.

[0062] The target object 12 is at least made of the second material, which can be understood as the target object 12 being made of the second material, or the target object 12 being made of the second material and other materials (different from both the first material and the second material).

[0063] The second material is different from the first material. It is understood that after forming the target object and the covering portion, in order to remove the support (covering portion) and obtain the target object, the second material and other materials constituting the target object 12 are photocurable materials, but cannot be chemically eroded, and the support needs to be at least partially chemically eroded.

[0064] The target object 12 can be printed from a transparent light-curing resin to make a transparent model, a transparent shell, etc. The target object 12 can also be printed from a soft light-curing resin to make a simulated muscle, an elastic bracket, etc. The target object 12 can also be printed from a hard light-curing resin to be used in mold manufacturing, industrial design and other fields.

[0065] The covering portion 112 completely covers the target surface 121. It can be understood that the target surface 121 can be Figure 3 The entire surface covered by the middle covering portion 112 may also be Figure 3 The target surface 121 is a portion of the surface covered by the covering portion 112. It should be noted that the target surface 121 requires a higher surface quality. For example, after removing the covering portion, there are no protrusions or depressions on the target surface 121.

[0066] The covering portion 112 needs to completely cover the target surface 121. Figure 6 As shown, the covering portion 112 includes a plurality of covering segments, and a gap 14 is left between two adjacent covering segments; in the actual printing stage, the light emitting unit 13 (i.e., light source) is used to emit light to print the support unit 11 and the target object 12 layer by layer. Specifically, the first multiple layers that are cured form a part of the multiple support elements 111; then the one or more layers that are cured form a part of the multiple support elements 111 and a part of the covering portion 112; then the one or more layers that are cured form a part of the multiple support elements 111, a part of the covering portion 112, and a part of the target object 12; then the one or more layers that are cured form a part of the covering portion 112 and a part of the target object 12; finally, the multiple layers that are cured form a part of the target object 12.

[0067] like Figure 6 As shown, the gap 14 between two adjacent covering segments is partially filled by the target object 12. This is because when the material is cured at the position corresponding to the gap 14 to form the target object 12, the thickness of the newly formed layer is not limited by the entity, and the preset exposure parameters lead to an excessively large curing thickness (called "overexposure"). For example, the thickness to be formed by curing is 50μm, but due to overexposure, the actual thickness formed by curing is 60μm; after the covering portion 112 is chemically etched and removed, a protrusion with a thickness of 10μm (60μm-50μm=10μm) will appear on the target surface 121. Therefore, the covering portion 112 needs to completely cover the target surface 121.

[0068] S200 , chemically etching the covered portion 112 to obtain the target object 12 .

[0069] Depending on the first material constituting the target object 12 , the chemical etching may be water dissolution, acid dissolution, etc., to remove the covering portion 112 and obtain the target object 12 .

[0070] The beneficial effects of the photocuring 3D printing method provided in the embodiment of the present application are as follows: the target surface 121 is completely covered by the covering part 112, that is, the support unit 11 and the target object 12 are in surface contact, and after the covering part 112 is dissolved and removed, a target object 12 with a smooth target surface 121 can be obtained, thereby avoiding the appearance of a connection "point" between the support unit 11 and the target object 12, and further avoiding depressions or protrusions on the surface of the target object 12; the workload of subsequent secondary processing (filling depressions, polishing protrusions) can be saved, thereby improving work efficiency.

[0071] Before printing, three-dimensional model data needs to be prepared; specifically, the model file is first imported, and the placement of the model is adjusted; then, the support unit 11 and the target object 12 are formed.

[0072] Reference Fig.10 , the printing platform 15 moves upward layer by layer away from the liquid resin, and the cured resin layer is peeled off and remains on the printing platform 15 to form a three-dimensional model, wherein the dotted line represents the interface between the layers. The light emitting unit emits light to print the support unit 11 and the target object 12 layer by layer. Specifically, the first multiple layers that are cured form a part of the multiple support elements 111; then the one or more layers that are cured form a part of the multiple support elements 111 and a part of the covering part 112; then the one or more layers that are cured form a part of the multiple support elements 111, a part of the covering part 112, and a part of the target object 12; then the one or more layers that are cured form a part of the covering part 112 and a part of the target object 12; finally, the multiple layers that are cured form a part of the target object 12.

[0073] Please also refer to Figure 3 and Figure 4 In some embodiments, the supporting unit 11 further includes a plurality of supporting elements 111 spaced apart from each other, wherein the covering portion 112 is formed between the target object 12 and the plurality of supporting elements 111 .

[0074] The supporting element 111 plays a major supporting role, wherein the supporting element 111 may be a material that is photocurable and chemically eroded, or a material that is photocurable and chemically inert. When the supporting element 111 is a material that is photocurable and chemically inert, the material of the supporting element 111 may be the same as the material of the target object 12, or may be different from the material of the target object 12.

[0075] The covering portion 112 is located between the target object 12 and the plurality of supporting elements 111 to separate the supporting elements 111 from the target object 12 , so that no connection “point” exists between the supporting elements 111 and the target object 12 .

[0076] Optionally, the support element 111 is a support rod 1111. It is understood that, on the projection of the target surface 121, the plurality of support rods 1111 may be arranged uniformly, that is, the spacing between two adjacent support rods 1111 is the same; the plurality of support rods 1111 may also be arranged irregularly, that is, the spacing between two adjacent support rods 1111 is not the same, or the spacing between two adjacent support rods 1111 is partially the same and partially different.

[0077] The cross section of the support rod 1111 may be circular, elliptical, polygonal, or any other shape, etc. The cross section size of the support rod 1111 and the length of the support rod 1111 may be set as required.

[0078] Based on the above technical solution, the multiple supporting elements 111 are spaced apart from each other, so that the structure of the supporting elements 111 is relatively simple, which is conducive to printing, thereby improving printing efficiency.

[0079] In other embodiments, the support element 111 may also be a sheet structure, a honeycomb structure, a tree branch structure, etc. Alternatively, the support unit 11 may not include the support element 111. Figure 7 As shown, the support unit 11 only includes the covering portion 112. In some embodiments, the covering portion has a uniform thickness. In some embodiments, the covering portion has a non-uniform thickness.

[0080] Please refer to Figure 4 In some embodiments, the thickness of the covering portion 112 in the plurality of first regions 1121 corresponding to the plurality of support elements 111 is greater than the thickness of the covering portion 112 in the second region 1122 , and the second region 1122 does not overlap with the plurality of first regions 1121 .

[0081] The first area 1121 of the covering portion 112 corresponding to the plurality of support elements 111 refers to the projection area of ​​the support element 111 in the vertical direction Z and a certain area around the projection area. Optionally, when the distance between any two adjacent support elements 111 is relatively far, the number of the first areas 1121 may be arranged in one-to-one correspondence with the number of the support elements 111, that is, the number of the first areas 1121 is equal to the number of the support elements 111. When the distance between at least two support elements 111 is relatively close, at least two support elements 111 may share one first area 1121, for example, two support elements 111 share one first area 1121, or three support elements 111 share one first area 1121; that is, the number of the first areas 1121 is less than the number of the support elements 111.

[0082] The second region 1122 does not overlap with the plurality of first regions 1121 , which means that the second region 1122 is a region of the covering portion 112 excluding the first regions 1121 .

[0083] Based on the above scheme, the thickness of the covering part 112 in the first area 1121 is relatively large, which can ensure the connection strength between the supporting element 111 and the covering part 112, thereby ensuring that the supporting element 111 stably supports the target object 12; since the cost of the first material that can be chemically corroded is relatively high, the thickness of the covering part 112 in the second area 1122 is relatively small, which can reduce the use of the first material, thereby reducing costs.

[0084] In other embodiments, the thickness of the covering portion 112 in the plurality of first regions 1121 corresponding to the plurality of support elements 111 may be equal to or less than the thickness of the covering portion 112 in the second region 1122 .

[0085] In some embodiments, the thickness t1 of the covering portion 112 in the first region 1121 is 100 μm to 300 μm, and the thickness t2 of the covering portion 112 in the second region 1122 is 20 μm to 100 μm.

[0086] It can be understood that the thickness t1 of the covering portion 112 in the first region 1121 may be 100 μm, 150 μm, 200 μm, 250 μm, 300 μm, etc.

[0087] It can be understood that the thickness t2 of the covering portion 112 in the second region 1122 can be 20 μm, 40 μm, 60 μm, 80 μm, 100 μm, etc.

[0088] Based on the above solution, the thickness t1 of the first region 1121 is designed to be 100 μm to 300 μm, and the thickness of the first region 1121 is not too large while ensuring the connection strength between the support element 111 and the covering portion 112; the thickness t2 of the second region 1122 is designed to be 20 μm to 100 μm, and the thickness of the second region 1122 is not too large while ensuring effective coverage of the target surface 121. Therefore, the material cost can be reduced.

[0089] In some embodiments, support element 111 is composed of a third material that is different from the first material.

[0090] The third material may be the same as the second material or may be different from the second material.

[0091] Based on the above technical solution, since the cost of the first material that can be chemically corroded is relatively high, the support element 111 is made of a third material different from the first material, which can reduce the cost.

[0092] In other embodiments, the supporting element 111 may also be made of the first material.

[0093] In some embodiments, the target object 12 is composed of at least two materials, and the at least two materials include the second material. That is, in addition to being composed of the second material, the target object 12 is also composed of at least one other material, for example, the other materials may be one, two, or three or more.

[0094] Based on the above technical solution, the target object 12 is composed of at least two materials, which can meet the function, performance and other requirements of the target structure.

[0095] Please refer to Figure 3 In some embodiments, in the vertical direction Z, the projection of the covering portion 112 covers the projection of the target object 12. The vertical direction Z is the irradiation direction of the light source.

[0096] The projection of the covering portion 112 covers the projection of the target object 12 , that is, the projection of the target object 12 is within the projection of the covering portion 112 .

[0097] It can be understood that the target surface 121 can be the entire surface covered by the covering portion 112; or, the target surface 121 can also be a portion of the surface covered by the covering portion 112, and the other portion of the surface is a surface with low surface quality requirements.

[0098] By adopting the above technical solution, after the covering part 112 is dissolved and removed, when the target surface 121 is the entire surface covered by the covering part 112, the target surface 121 of the target object 12 is of excellent quality; when the target surface 121 is the partial surface covered by the covering part 112, the target surface 121 of the target object 12 and the surfaces around the target surface 121 are of excellent quality.

[0099] In other embodiments, please refer to Figure 5 , in the vertical direction Z, when the covering portion 112 completely covers the target surface 121, the projection of the covering portion 112 may not completely cover the projection of the target object 12, that is, Figure 8 and Fig. 9 As shown, the target object 12 has a bottom surface 120, and a portion of the bottom surface 120 is a target surface 121. It is understood that the target surface refers to a single area of ​​the target object (such as Fig. 9 left) or multiple spaced-apart areas (such as Fig. 9 Right). The target surface is either flat or uneven, depending on the 3D profile of the target object.

[0100] In some embodiments, the support unit 11 and the target object 12 are formed by radiation from a surface light source.

[0101] For example, digital light processing (DLP), liquid crystal display (LCD) and other printing methods can be used. Digital light processing (DLP) uses a digital projector screen to flash a single image of each layer at a time on the entire platform, creates a mask through micro-mirror array transmission, and solidifies the resin layer by layer; digital light processing (DLP) technology can quickly print large-area objects, suitable for products that require high printing speed and high quality, such as automotive parts, medical devices, etc. Liquid crystal display (LCD) uses a liquid crystal display as a light source, transmits light to the layer mask on the LCD panel through UV LED, and solidifies the resin layer by layer; liquid crystal display (LCD) technology has a high printing speed and relatively low cost, suitable for products that require high resolution and large-area printing, such as figures, jewelry, etc.

[0102] Based on the above solution, the surface light source has a large irradiation range and uniform light, which can improve printing efficiency and printing quality.

[0103] Please also refer to Figure 3 and Figure 4 In some embodiments, the target surface 121 is a curved surface, and the covering portion 112 is a curved structure. It can be understood that when the target surface is an uneven surface, the covering portion has a surface for contacting and complementing the target surface.

[0104] It can be understood that the target surface 121 can be a spherical surface, an ellipsoidal surface, a cylindrical surface or a curved surface of other shapes. Optionally, when the target surface 121 is a spherical surface, the target object 12 is a sphere. The covering portion 112 is a curved structure adapted to the target surface 121; for example, when the target surface 121 is a spherical surface, the covering portion 112 is a spherical structure; when the target surface 121 is an ellipsoidal surface, the covering portion 112 is an ellipsoidal structure; when the target surface 121 is a cylindrical surface, the covering portion 112 is a cylindrical structure.

[0105] By adopting the above technical solution, the photo-curing 3D printing method is applicable to a target object 12 with a curved surface.

[0106] In other embodiments, the target surface 121 may be a plane, and the covering portion 112 may be a flat plate structure.

[0107] In some embodiments, the first material is a water-soluble photosensitive resin, and chemically etching the covering portion 112 includes: using water to dissolve the covering portion 112. That is, the first material can be cured under light radiation and can be dissolved under the action of water.

[0108] Optionally, the water-soluble photosensitive resin may be polyvinyl alcohol resin, acrylic copolymer, or the like.

[0109] Based on the above solution, after the target object 12 and the supporting unit 11 are placed in water, the covering portion 112 composed of the water-soluble photosensitive resin will dissolve to obtain the target object 12 with good surface quality.

[0110] In other embodiments, the first material may also be an acid-decomposable material. For example, an acid-decomposable material uses polyoxymethylene as a base material and is combined by adding other materials. After printing is completed, the material is decomposed and removed by soaking in an acidic liquid.

[0111] In some embodiments, the first material is a hot-melt photosensitive resin, and chemically etching the covering portion 112 includes: heating the covering portion 112 to melt the covering portion 112. That is, the first material can be cured under light radiation and can be melted under the action of heat.

[0112] Based on the above solution, after the target object 12 and the supporting unit 11 are heated, the covering portion 112 composed of the hot-melt photosensitive resin will melt to obtain the target object 12 with good surface quality.

[0113] The second aspect of the present application provides a light-cured 3D printed part. The light-cured 3D printed part is printed using the light-cured 3D printing method described in the first aspect. The target object 12 in the light-cured 3D printing method is the light-cured 3D printed part.

[0114] The photocurable 3D printed part adopts any one or more embodiments of the above-mentioned photocurable 3D printing method, and thus has the beneficial effects of the above-mentioned embodiments, which will not be described one by one here.

[0115] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A light-curing 3D printing method, characterized in that: include: forming a support unit and a target object; Wherein, the support unit comprises a covering portion, and the covering portion is made of a first material; The target object comprises a target surface, the covering portion completely covers the target surface, the target object is composed of at least a second material, and the second material is different from the first material; The covered portion is chemically etched to obtain the target object.

2. The light-curing 3D printing method according to claim 1, characterized in that: The supporting unit further includes a plurality of supporting elements spaced apart from each other, wherein the covering portion is formed between the target object and the plurality of supporting elements.

3. The light-curing 3D printing method according to claim 2, characterized in that: The thickness of the covering portion in a plurality of first regions corresponding to the plurality of supporting elements is greater than the thickness of the covering portion in a second region, wherein the second region does not overlap with the plurality of first regions.

4. The light-curing 3D printing method according to claim 3, characterized in that: The thickness of the covering portion in the first region is 100 μm-300 μm; and / or, The thickness of the covering portion in the second region is 20 μm-100 μm.

5. The light-curing 3D printing method according to claim 2, characterized in that: The support element is composed of a third material, which is different from the first material.

6. The light-curing 3D printing method according to claim 1, characterized in that: The target object is composed of at least two materials, and the at least two materials include the second material.

7. The light-curing 3D printing method according to claim 1, characterized in that: In the vertical direction, the projection of the covering portion covers the projection of the target object.

8. The light-curing 3D printing method according to claim 1, characterized in that: The first material is a water-soluble photosensitive resin, and Wherein, chemically corroding the covering portion comprises: using water to dissolve the covering portion.

9. The light-curing 3D printing method according to claim 1, characterized in that: The target surface is non-planar.

10. The light-curing 3D printing method according to claim 1, characterized in that: Chemically attacking the covered parts includes: The covered portion is etched using an acidic solvent.

11. A light-cured 3D printed part, characterized in that: Printed by the light-curing 3D printing method according to any one of claims 1 to 10.

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