A design method for 3D printing ceramic conformal mold

Abstract

The present invention discloses a design method for a 3D printed ceramic conformable mold, which specifically includes the following steps: S1, obtaining three-dimensional model data of a part; S2, establishing a block; S3, obtaining a concave block; S4, honeycombing the concave block; S5, obtaining a three-dimensional drawing of a conformable mold; S6, preparing a conformable mold green body; S7, applying a layer of coarse ceramic powder on the concave surface of the conformable mold green body; S8, placing a photocurable 3D printed ceramic part green body on the conformable mold green body; S9, degreasing and sintering; S10, taking it out after cooling to room temperature; S11, separating the sintered ceramic part and the conformable mold to obtain the sintered ceramic part, and the present invention relates to the field of ceramic mold technology. The design method of the 3D printed ceramic conformable mold reduces the deformation of the part size, reduces the structural size error to within ±0.1mm, reduces the crack defects of the part, prevents adhesion to the conformable mold during the sintering process, makes the honeycomb lightweight, reduces material loss, and reduces the weight of the parts inside the furnace.

Description

Technical Field

[0001] The present invention relates to the technical field of ceramic moulds, and in particular to a design method for a 3D printed ceramic conformable mould. Background Art

[0002] Photocuring ceramic 3D printing technology has the characteristics of high precision and can form complex structural ceramic parts. Its principle is to mix photosensitive resin with ceramic powder to prepare photosensitive ceramic slurry with high solid content, and then use photocuring ceramic 3D printing equipment to manufacture ceramic green body, and then carry out high-temperature degreasing and sintering to obtain complex ceramic parts. The slurry of this technology contains a high proportion of photosensitive resin as a binder, and it is necessary to ensure the mechanical strength of the green body during 3D printing. Therefore, during the high-temperature degreasing and sintering process, the parts will have a shrinkage rate of 3-20% as the temperature rises, which will cause the deformation of the parts or produce a large dimensional accuracy error. Structural ceramic molds, some electrical equipment, where wear resistance and insulation are required and the amount is relatively large, will use structural ceramics, and the mold for forming this kind of structural part is called a ceramic structural mold. The powder molding and hardness are relatively high. The mold is divided into an upper mold, a lower mold, and a concave mold. Some products with holes will require a core rod. In order to improve the service life and consistency of the product, tungsten steel should be used as much as possible for the working parts of the die and the core rod. Tungsten steel can also be used for products with simple shapes of upper and lower dies and large production output. If the shape is too complicated, especially the end face of the mold is complicated, try to use mold steel for easy processing.

[0003] Metal (ceramic) injection molding technology can manufacture high-precision and complex metal (ceramic) parts. Also, due to the large amount of glue in the green body and the large degreasing and sintering shrinkage, some high-precision parts will use machined ceramic conformal molds as the base, and put them in the furnace to prevent the parts from deforming during the heat treatment process and ensure the dimensional accuracy of the parts. However, the traditional machined conformal molds do not have the same sintering shrinkage as the manufactured parts, and their poor air permeability affects the degreasing process of the parts and makes them prone to defects. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the shortcomings of the prior art, the present invention provides a design method for a 3D printed ceramic conformal mold, which is aimed at the degreasing and sintering process of green ceramic (metal) complex parts with a large amount of glue, reduces part defects and deformation, and improves part dimensional accuracy.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a design method for a 3D printed ceramic conformable mold, specifically comprising the following steps:

[0008] S1. Obtain the three-dimensional model data of the parts by using three-dimensional drawing software or reverse engineering;

[0009] S2, establish a block whose shape coincides with the outer contour of the part projection;

[0010] S3, using the three-dimensional solid on one side of the part to perform Boolean cutting on the block to obtain a concave block;

[0011] S4, forming a honeycomb structure on the concave block;

[0012] S5. Designing a random or uniformly distributed hole structure on the side wall of the honeycomb structure to obtain a three-dimensional drawing of the conformal mold;

[0013] S6. Prepare the conformable mold ceramic green body by using the light-curing ceramic 3D printing technology;

[0014] S7, applying a layer of coarse ceramic powder on the concave surface of the green body of the conformable mold;

[0015] S8, placing the light-curing 3D-printed ceramic part on the conformable mold green body, and checking the fit between the outer contour of the part and the green body surface;

[0016] S9, assembling the light-curing 3D printed ceramic parts and the conformable mold and placing them in a heat treatment device for degreasing and sintering;

[0017] S10, take out after cooling to room temperature, and knock the accompanying mold to peel the part off the mold surface;

[0018] Preferably, in step S2, the block height is 5-50 mm, or is the same height as the part.

[0019] Preferably, the cutting depth in step S3 is 1 / 3-2 / 3 of the height of the part.

[0020] Preferably, in step S4, the size of the honeycomb is 2-10 mm, and the wall thickness is 0.5-2 mm.

[0021] Preferably, the size of the holes in step S5 is less than 1 / 2 times the honeycomb size to ensure structural strength.

[0022] Preferably, the particle size of the coarse ceramic powder in the hole in step S7 is 100 μm-300 μm, and the material is corundum or silicon carbide or a mixture of the two.

[0023] Preferably, in step S7, the part does not produce visible shaking in the conformable mold.

[0024] Preferably, the debinding and sintering temperature in step S8 is set according to the requirements of the parts, and is kept at 600° C. for 4-6 hours.

[0025] Preferably, the heat treatment equipment in step S8 is a muffle furnace, a vacuum sintering furnace or an atmosphere furnace.

[0026] (III) Beneficial effects

[0027] The invention provides a design method for a 3D printing ceramic conformal mold. Compared with the prior art, the method has the following beneficial effects: the method for designing a 3D printed ceramic conformable mold specifically comprises the following steps: S1, obtaining the three-dimensional model data of the part by using three-dimensional drawing software or reverse engineering; S2, establishing a block whose shape coincides with the outer contour of the projected part; S3, using the three-dimensional entity on one side of the part to perform Boolean cutting on the block to obtain a concave block; S4, honeycomb-structuring the concave block; S5, designing an arbitrary or uniformly distributed hole structure on the side wall of the honeycomb structure to obtain a three-dimensional drawing of the conformable mold; S6, preparing a conformable mold ceramic green body by using photocuring ceramic 3D printing technology; S7, applying a layer of coarse ceramic powder on the concave surface of the conformable mold green body; S8, placing the photocuring 3D printed ceramic part on the conformable mold green body, and checking the degree of fit between the outer contour of the part and the surface of the green body; S9, assembling the photocuring 3D printed ceramic part and the conformable mold and placing them in a heat treatment device for degreasing and sintering; S10, taking them out after cooling to room temperature, and knocking the accompanying mold to peel the part off the mold surface. For the degreasing and sintering process of green complex ceramic (metal) parts with high glue content, it can reduce part defects and deformation, improve part dimensional accuracy, reduce part dimensional deformation, reduce structural dimensional error to within ±0.1mm, reduce part crack defects, prevent adhesion to accompanying molds during sintering, make honeycombs lightweight, reduce material loss, reduce the weight of parts inside the furnace, and extend the life of the furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A flow chart of the method for designing the present invention;

[0029] Figure 2 A schematic diagram of a three-dimensional model of a part in an embodiment of the present invention;

[0030] Figure 3 A schematic diagram of a concave shape formed by Boolean cutting on a projection block in an embodiment of the present invention;

[0031] Figure 4 Schematic diagram of cellular processing in an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figure 1-4 The embodiment of the present invention provides six technical solutions: a design method for a 3D printed ceramic conformable mold, specifically including the following embodiments:

[0034] Example 1

[0035] A design method for a 3D printed ceramic conformable mold specifically comprises the following steps:

[0036] S1. Obtain the three-dimensional model data of the parts by using three-dimensional drawing software or reverse engineering;

[0037] S2. Create a block whose shape coincides with the outer contour of the part projection, and the block height is 30 mm;

[0038] S3, using the three-dimensional solid on one side of the part to perform Boolean cutting on the block to obtain a concave block with a cutting depth of 1 / 3 of the part height;

[0039] S4, the concave block is honeycombed, the size of the honeycomb is 6 mm, and the wall thickness is 1.25 mm;

[0040] S5. Design a random or evenly distributed hole structure on the side wall of the honeycomb structure to obtain a three-dimensional drawing of the conformal mold. The hole size is less than 1 / 2 times the honeycomb size to ensure structural strength.

[0041] S6. Prepare the green body of the conformable mold by using the light-curing ceramic 3D printing technology;

[0042] S7, coating a layer of coarse ceramic powder on the concave surface of the green body of the conformable mold, wherein the particle size of the coarse ceramic powder is 200 μm and the material is corundum;

[0043] S8. Place the light-curing 3D printed ceramic part on the green body of the conformable mold, check the fit between the outer contour of the part and the surface of the green body, and make sure that the part does not shake noticeably in the conformable mold;

[0044] S9, after assembling the light-curing 3D printed ceramic parts and the conformable mold, place them in a heat treatment device for degreasing and sintering. The degreasing and sintering temperature is set according to the requirements of the parts. The heat treatment device uses a muffle furnace, which is kept at 600°C for 4 hours;

[0045] S10, take out after cooling to room temperature, and knock the accompanying mold to peel off the part on the mold surface.

[0046] Example 2

[0047] A design method for a 3D printed ceramic conformable mold specifically comprises the following steps:

[0048] S1. Obtain the three-dimensional model data of the parts by using three-dimensional drawing software or reverse engineering;

[0049] S2. Create a block whose shape coincides with the outer contour of the part projection, and the block height is 5 mm;

[0050] S3, using the three-dimensional solid on one side of the part to perform Boolean cutting on the block to obtain a concave block with a cutting depth of 2 / 3 of the part height;

[0051] S4, the concave block is honeycombed, the size of the honeycomb is 2 mm, and the wall thickness is 0.5 mm;

[0052] S5. Design a random or evenly distributed hole structure on the side wall of the honeycomb structure to obtain a three-dimensional drawing of the conformal mold. The hole size is less than 1 / 2 times the honeycomb size to ensure structural strength.

[0053] S6. Prepare the green body of the conformable mold by using the light-curing ceramic 3D printing technology;

[0054] S7, coating a layer of coarse ceramic powder on the concave surface of the green body of the conformable mold, wherein the coarse ceramic powder has a particle size of 300 μm and is made of corundum;

[0055] S8. Place the light-curing 3D printed ceramic part on the green body of the conformable mold, check the fit between the outer contour of the part and the surface of the green body, and make sure that the part does not shake noticeably in the conformable mold;

[0056] S9, after assembling the light-curing 3D printed ceramic parts and the conformable mold, place them in a heat treatment device for degreasing and sintering. The degreasing and sintering temperature is set according to the requirements of the parts. The heat treatment device uses a muffle furnace, which is kept at 600°C for 5 hours;

[0057] S10, take out after cooling to room temperature, and knock the accompanying mold to peel off the part on the mold surface.

[0058] Example 3

[0059] A design method for a 3D printed ceramic conformable mold specifically comprises the following steps:

[0060] S1. Obtain the three-dimensional model data of the parts by using three-dimensional drawing software or reverse engineering;

[0061] S2. Create a block whose shape coincides with the outer contour of the part projection, and the block height is 50 mm;

[0062] S3, using the three-dimensional solid on one side of the part to perform Boolean cutting on the block to obtain a concave block with a cutting depth of 1 / 3 of the part height;

[0063] S4, forming a honeycomb structure on the concave block, wherein the size of the honeycomb is 10 mm and the wall thickness is 2 mm;

[0064] S5. Design a random or evenly distributed hole structure on the side wall of the honeycomb structure to obtain a three-dimensional drawing of the conformal mold. The hole size is less than 1 / 2 times the honeycomb size to ensure structural strength.

[0065] S6. Prepare the green body of the conformable mold by using the light-curing ceramic 3D printing technology;

[0066] S7, coating a layer of coarse ceramic powder on the concave surface of the green body of the conformable mold, wherein the particle size of the coarse ceramic powder is 300 μm and the material is silicon carbide;

[0067] S8. Place the light-curing 3D printed ceramic part on the green body of the conformable mold, check the fit between the outer contour of the part and the surface of the green body, and make sure that the part does not shake noticeably in the conformable mold;

[0068] S9, after assembling the light-curing 3D printed ceramic parts and the conformable mold, place them in a heat treatment device for degreasing and sintering. The degreasing and sintering temperature is set according to the requirements of the parts. The heat treatment device uses a muffle furnace, which is kept at 600°C for 6 hours;

[0069] S10, take out after cooling to room temperature, and knock the accompanying mold to peel off the part on the mold surface.

[0070] Example 4

[0071] A design method for a 3D printed ceramic conformable mold specifically comprises the following steps:

[0072] S1. Obtain the three-dimensional model data of the parts by using three-dimensional drawing software or reverse engineering;

[0073] S2. Create a block whose shape coincides with the outer contour of the part projection, and whose height is the same as that of the part;

[0074] S3, using the three-dimensional solid on one side of the part to perform Boolean cutting on the block to obtain a concave block with a cutting depth of 2 / 3 of the part height;

[0075] S4, the concave block is honeycombed, the size of the honeycomb is 5 mm, and the wall thickness is 1 mm;

[0076] S5. Design a random or evenly distributed hole structure on the side wall of the honeycomb structure to obtain a three-dimensional drawing of the conformal mold. The hole size is less than 1 / 2 times the honeycomb size to ensure structural strength.

[0077] S6. Prepare the green body of the conformable mold by using the light-curing ceramic 3D printing technology;

[0078] S7, coating a layer of coarse ceramic powder on the concave surface of the green body of the conformable mold, wherein the particle size of the coarse ceramic powder is 200 μm and the material is silicon carbide;

[0079] S8. Place the light-curing 3D printed ceramic part on the green body of the conformable mold, check the fit between the outer contour of the part and the surface of the green body, and make sure that the part does not shake noticeably in the conformable mold;

[0080] S9, after assembling the light-curing 3D printed ceramic parts and the conformable mold, place them in a heat treatment device for degreasing and sintering. The degreasing and sintering temperature is set according to the requirements of the parts. The heat treatment device uses a muffle furnace, which is kept at 600°C for 4 hours;

[0081] S10, take out after cooling to room temperature, and knock the accompanying mold to peel off the part on the mold surface.

[0082] Example 5

[0083] A design method for a 3D printed ceramic conformable mold specifically comprises the following steps:

[0084] S1. Obtain the three-dimensional model data of the parts by using three-dimensional drawing software or reverse engineering;

[0085] S2. Create a block whose shape coincides with the outer contour of the part projection, and the block height is 20 mm;

[0086] S3, using the three-dimensional solid on one side of the part to perform Boolean cutting on the block to obtain a concave block with a cutting depth of 1 / 3 of the part height;

[0087] S4, the concave block is honeycombed, the size of the honeycomb is 7 mm, and the wall thickness is 1.5 mm;

[0088] S5. Design a random or evenly distributed hole structure on the side wall of the honeycomb structure to obtain a three-dimensional drawing of the conformal mold. The hole size is less than 1 / 2 times the honeycomb size to ensure structural strength.

[0089] S6. Prepare the green body of the conformable mold by using the light-curing ceramic 3D printing technology;

[0090] S7, coating a layer of coarse ceramic powder on the concave surface of the green body of the conformable mold, wherein the particle size of the coarse ceramic powder is 200 μm and the material is silicon carbide;

[0091] S8. Place the light-curing 3D printed ceramic part on the green body of the conformable mold, check the fit between the outer contour of the part and the surface of the green body, and make sure that the part does not shake noticeably in the conformable mold;

[0092] S9, after assembling the light-curing 3D printed ceramic parts and the conformable mold, place them in a heat treatment device for degreasing and sintering. The degreasing and sintering temperature is set according to the requirements of the parts. The heat treatment device uses a muffle furnace, which is kept at 600°C for 5 hours;

[0093] S10, take out after cooling to room temperature, and knock the accompanying mold to peel off the part on the mold surface.

[0094] Example 6

[0095] A design method for a 3D printed ceramic conformable mold specifically comprises the following steps:

[0096] S1. Obtain the three-dimensional model data of the parts by using three-dimensional drawing software or reverse engineering;

[0097] S2. Create a block whose shape coincides with the outer contour of the part projection, and the block height is 40 mm;

[0098] S3, using the three-dimensional solid on one side of the part to perform Boolean cutting on the block to obtain a concave block with a cutting depth of 2 / 3 of the part height;

[0099] S4, the concave block is honeycombed, the size of the honeycomb is 8 mm, and the wall thickness is 1.75 mm;

[0100] S5. Design a random or evenly distributed hole structure on the side wall of the honeycomb structure to obtain a three-dimensional drawing of the conformal mold. The hole size is less than 1 / 2 times the honeycomb size to ensure structural strength.

[0101] S6. Prepare the green body of the conformable mold by using the light-curing ceramic 3D printing technology;

[0102] S7, coating a layer of coarse ceramic powder on the concave surface of the green body of the conformable mold, wherein the particle size of the coarse ceramic powder is 200 μm and the material is silicon carbide;

[0103] S8. Place the light-curing 3D printed ceramic part on the green body of the conformable mold, check the fit between the outer contour of the part and the surface of the green body, and make sure that the part does not shake noticeably in the conformable mold;

[0104] S9, after assembling the light-curing 3D printed ceramic parts and the conformable mold, place them in a heat treatment device for degreasing and sintering. The degreasing and sintering temperature is set according to the requirements of the parts. The heat treatment device uses a muffle furnace, which is kept at 600°C for 6 hours;

[0105] S10, take out after cooling to room temperature, and knock the accompanying mold to peel off the part on the mold surface.

[0106] In summary, the present invention aims at the degreasing and sintering process of green ceramic (metal) complex parts with a large amount of glue, reduces part defects and deformation, improves part dimensional accuracy, reduces part dimensional deformation, reduces structural dimensional error to within ±0.1mm, reduces part crack defects, prevents adhesion to accompanying molds during sintering, lightweights the honeycomb, reduces material loss, reduces the weight of parts inside the furnace, and extends the life of the furnace.

[0107] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0108] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0109] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A design method for a 3D printed ceramic conformable mold, characterized in that: The specific steps include: S1. Obtain the three-dimensional model data of the parts by using three-dimensional drawing software or reverse engineering; S2, establish a block whose shape coincides with the outer contour of the part projection; S3, using the three-dimensional solid on one side of the part to perform Boolean cutting on the block to obtain a concave block; S4, forming a honeycomb structure on the concave block; S5. Designing a random or uniformly distributed hole structure on the side wall of the honeycomb structure to obtain a three-dimensional drawing of the conformal mold; S6, using light-curing ceramic 3D printing technology to prepare a ceramic conformable mold green body; S7, applying a layer of coarse ceramic powder on the concave surface of the green body of the conformable mold; S8, placing the light-curing 3D-printed ceramic part on the conformable mold green body, and checking the fit between the outer contour of the ceramic part and the surface of the conformable mold green body; S9, assembling the light-curing 3D printed ceramic parts and the conformable mold green body and placing them in a heat treatment device for degreasing and sintering; S10, taking out after cooling to room temperature, and knocking the accompanying mold to make the ceramic parts peel off from the surface of the accompanying mold.

2. The design method of a 3D printed ceramic conformable mold according to claim 1, characterized in that: In step S2, the block height is 5-50 mm, or is the same height as the part.

3. The design method of a 3D printed ceramic conformable mold according to claim 1, characterized in that: The cutting depth in step S3 is 1 / 3-2 / 3 of the height of the part.

4. The design method of a 3D printed ceramic conformable mold according to claim 1, characterized in that: The size of the honeycomb in step S4 is 2-10 mm, and the wall thickness is 0.5-2 mm.

5. The method for designing a 3D printed ceramic conformable mold according to claim 1, characterized in that: The size of the holes in step S5 is less than 1 / 2 times the honeycomb size to ensure structural strength.

6. The design method of a 3D printed ceramic conformable mold according to claim 1, characterized in that: In the step S7, the particle size of the coarse ceramic powder on the concave surface is 100 μm-300 μm, and the material is corundum or silicon carbide or a mixture of the two.

7. The design method of a 3D printed ceramic conformable mold according to claim 1, characterized in that: In the step S8, the ceramic part does not produce visible shaking in the conformable mold.

8. The method for designing a 3D printed ceramic conformable mold according to claim 1, characterized in that: In step S9, the debinding and sintering temperature is set according to the requirements of the parts, and is kept at 600° C. for 4-6 hours.

9. The design method of a 3D printed ceramic conformable mold according to claim 1, characterized in that: The heat treatment equipment in step S10 is a muffle furnace, a vacuum sintering furnace or an atmosphere furnace.

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