Resin tank and photocuring 3D printing device

Abstract

The utility model discloses a resin tank and a photocuring 3D printing device, and the resin tank comprises a resin tank main body which is used for accommodating photosensitive resin; and the non-stick coating is arranged on the inner surface of the resin tank main body and is used for preventing the photosensitive resin from being adhered to the inner surface of the resin tank main body. In this way, resin residues in the resin tank can be reduced, and the easy-to-clean property of the resin tank can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printing, and in particular to a resin tank and a light-curing 3D printing device. Background Art

[0002] With its high precision, high efficiency and diversity, photocuring 3D printing technology has become an important tool in the field of product design and manufacturing. Its working principle is: the photocuring 3D printing device contains a resin tank inside, and a UV light source is installed above the resin tank. When printing, the liquid surface of the photosensitive resin in the resin tank is fixed at the focal plane by the release film, and then under the irradiation of ultraviolet rays, the photosensitive resin undergoes chemical cross-linking, thereby solidifying into a solid object, and then the platform descends, and the liquid photosensitive resin is replenished and exposed again. By repeating this process continuously, the entire 3D printing process is finally completed. However, when pouring out the photosensitive resin from the existing resin tank, the photosensitive resin flows slowly and there is a lot of residue. When cleaning the resin tank, paper cloth dipped in alcohol needs to be repeatedly wiped, and it may not be wiped clean. If it is not wiped clean, the photosensitive resin will be contaminated, and the user experience is not good. Utility Model Content

[0003] Based on this, an embodiment of the utility model provides a resin tank and a light-curing 3D printing device, which aim to reduce the resin residue in the resin tank and improve the cleanability of the resin tank.

[0004] In a first aspect, an embodiment of the utility model provides a resin tank applied to a photocuring 3D printing device, the resin tank comprising:

[0005] A resin tank body, used for containing photosensitive resin;

[0006] The non-stick coating is arranged on the inner surface of the resin tank body to prevent the photosensitive resin from sticking to the inner surface of the resin tank body.

[0007] In some embodiments, the surface tension coefficient of the non-stick coating is 18 mN / m to 30 mN / m.

[0008] In some embodiments, the heat resistance limit temperature of the non-stick coating is 600 degrees Celsius to 800 degrees Celsius.

[0009] In some embodiments, the non-stick coating has a thickness of 30 um to 80 um.

[0010] In some embodiments, the thermal conductivity of the non-stick coating is 20 w / (m·k) to 30 w / (m·k).

[0011] In some embodiments, the non-stick coating has a smoothness of 0.2 um to 1.6 um.

[0012] In some embodiments, the non-stick coating is a nano-ceramic coating coated on the inner surface of the resin tank body.

[0013] In some embodiments, the resin tank body is provided with a groove, and the non-stick coating includes a first non-stick coating provided on the inner surface of the groove and a second non-stick coating provided on the inner surface of the resin tank body, and the coatings used in the first non-stick coating and the second non-stick coating are the same or different.

[0014] In some embodiments, the resin tank further comprises:

[0015] A heating component is arranged on the outer surface of the groove in the resin tank body and is used to heat the photosensitive resin contained in the groove.

[0016] In a second aspect, an embodiment of the utility model further provides a light-curing 3D printing device, wherein the light-curing 3D printing device comprises a resin tank as described in the first aspect.

[0017] The inner surface of the resin tank in the embodiment of the utility model is provided with a non-stick coating. When the resin tank contains photosensitive resin, the non-stick coating can prevent the photosensitive resin from sticking to the inner surface, so that when the photosensitive resin is poured out of the resin tank, the photosensitive resin will not stick to the resin tank and can be poured out quickly. There is little or no resin residue in the resin tank, and the residual resin can be cleaned with a dry paper cloth. Therefore, compared with the related art, the embodiment of the utility model can greatly reduce the resin residue in the resin tank, and can also improve the easy cleaning of the resin tank, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of an embodiment of a resin tank of the utility model;

[0019] Figure 2 yes Figure 1 A schematic diagram of a cross section of a resin tank in FIG.

[0020] Figure 3 This is a schematic structural diagram of an embodiment of a resin tank of the utility model;

[0021] Figure 4 This is a schematic structural diagram of an embodiment of a resin tank of the utility model;

[0022] Figure 5 It is a structural schematic diagram of an embodiment of the light-curing 3D printing device of the utility model.

[0023] Description of main components and symbols:

[0024] 10. Resin tank; 11. Resin tank body; 12. Non-stick coating; 121. First non-stick coating; 122. Second non-stick coating; 13. Inner surface; 14. Groove; 15. Heating assembly; 20. Resin tank moving mechanism; 30. Light source and projection assembly; 31. Light outlet; 40. Printing platform; 50. Platform moving mechanism; 60. Film stretching assembly. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] The flowcharts shown in the accompanying drawings are only examples and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may also be decomposed, combined or partially merged, so the actual execution order may change according to actual conditions.

[0027] With its high precision, high efficiency and diversity, photocuring 3D printing technology has become an important tool in the field of product design and manufacturing. Its working principle is: the photocuring 3D printing device contains a resin tank inside, and a UV light source is installed above the resin tank. When printing, the liquid surface of the photosensitive resin in the resin tank is fixed at the focal plane by the release film, and then under the irradiation of ultraviolet rays, the photosensitive resin undergoes chemical cross-linking, thereby solidifying into a solid object, and then the platform descends, and the liquid photosensitive resin is replenished and exposed again. By repeating this process continuously, the entire 3D printing process is finally completed. However, when pouring out the photosensitive resin from the existing resin tank, the photosensitive resin flows slowly and there is a lot of residue. When cleaning the resin tank, paper cloth dipped in alcohol needs to be repeatedly wiped, and it may not be wiped clean. If it is not wiped clean, the photosensitive resin will be contaminated, and the user experience is not good.

[0028] The inner surface of the resin tank in the embodiment of the utility model is provided with a non-stick coating. When the resin tank contains photosensitive resin, the non-stick coating can prevent the photosensitive resin from sticking to the inner surface, so that when the photosensitive resin is poured out of the resin tank, the photosensitive resin will not stick to the resin tank and can be poured out quickly. There is little or no resin residue in the resin tank, and the residual resin can be cleaned with a dry paper cloth. Therefore, compared with the related art, the embodiment of the utility model can greatly reduce the resin residue in the resin tank, and can also improve the easy cleaning of the resin tank, thereby improving the user experience.

[0029] It should be noted that the photosensitive resin in the embodiment of the present invention refers to all materials that can be used for photocuring 3D printing, for example, photosensitive resin, photosensitive resin doped with ceramic slurry, and photosensitive resin doped with metal slurry.

[0030] The embodiments of the utility model are described in detail below with reference to the accompanying drawings.

[0031] See also Figure 1 and Figure 2 The resin tank 10 includes a resin tank body 11 and a non-stick coating 12. The resin tank body 11 is used to contain the photosensitive resin. The non-stick coating 12 is disposed on an inner surface 13 of the resin tank body 11 to prevent the photosensitive resin from adhering to the inner surface 13 of the resin tank body 11.

[0032] The inner surface of the resin tank 10 in the embodiment of the utility model is provided with a non-stick coating 12. When the resin tank 10 contains photosensitive resin, the non-stick coating 12 can prevent the photosensitive resin from sticking to the inner surface of the resin tank 10, so that when the photosensitive resin is poured out of the resin tank 10, the photosensitive resin will not stick to the resin tank 10 and can be poured out quickly. There is little or no resin residue in the resin tank 10, and the residual resin can be cleaned with a dry paper cloth.

[0033] In some embodiments, the non-stick coating 12 is a nano-ceramic coating coated on the inner surface of the resin tank body 11. It is understandable that the non-stick coating 12 of the present invention can also be other coatings coated on the inner surface of the resin tank body 11, and the present invention does not specifically limit this.

[0034] Continue reading Figure 1 The resin tank body 11 is provided with a groove 14 for accommodating the photosensitive resin. The non-stick coating 12 includes a first non-stick coating 121 provided on the inner surface of the groove 14 and a second non-stick coating 122 provided on the inner surface of the resin tank body 11 (the inner surface connected to the notch surface of the groove 14). The first non-stick coating 121 and the second non-stick coating 122 are made of the same coating. Using the same coating is beneficial to process control and cost control of the manufacturing process of the non-stick coating 12. For example, the first non-stick coating 121 and the second non-stick coating 122 are both nano-ceramic coatings. Of course, in other embodiments, the coatings used by the first non-stick coating 121 and the second non-stick coating 122 may also be different.

[0035] See also Figure 3In some embodiments, the resin tank body 11 is provided with a groove 14 for accommodating the photosensitive resin. The inner surface of the groove 14 is provided with a first non-stick coating 121, and the inner surface connected to the notch surface of the groove 14 is not provided with a second non-stick coating 122. Providing the non-stick coating only on the inner surface of the groove 14 can reduce the consumption of the coating and reduce the cost.

[0036] In some embodiments, the surface tension coefficient of the non-stick coating 12 is 18mN / m to 30mN / m, for example, the surface tension coefficient of the non-stick coating 12 is 18mN / m or 30mN / m. Therefore, the resin tank 10 in the embodiment of the utility model can be applicable to photosensitive resins of various viscosities. Among them, the photosensitive resin includes photosensitive resins of various viscosities. For example, a first photosensitive resin with low viscosity (viscosity less than 100cps) (such as HTL with a viscosity of 85cps), a second photosensitive resin with medium viscosity (viscosity between 100cps and 500cps) (such as HEK with a viscosity between 450cps and 500cps), a third photosensitive resin with high viscosity (viscosity between 500cps and 1000cps) (such as MED with a viscosity of 1000cps) or a fourth photosensitive resin with ultra-high viscosity (viscosity greater than 1000cps) (such as zirconium oxide slurry with a viscosity greater than 1000cps).

[0037] While ensuring that the surface tension coefficient of the non-stick coating 12 is 18mN / m to 30mN / m, the resin tank 10 in the embodiment of the utility model is used to test the non-stick effects after pouring out the first photosensitive resin, the second photosensitive resin, the third photosensitive resin and the fourth photosensitive resin from the resin tank 10, and the test results can be obtained. The test results can be shown in Table 1.

[0038] Table 1

[0039]

[0040] As can be seen from Table 1, after pouring out the photosensitive resin from the resin tank 10 in the embodiment of the utility model, the residual resin in the resin tank 10 is significantly reduced, thereby avoiding resin waste and improving the utilization rate of the resin. In addition, the cleaning of the resin tank 10 is more convenient and quick. In addition, there is obviously no residue in the resin tank 10 after cleaning, thereby avoiding contamination of the next batch of photosensitive resin. Therefore, as can be seen from Table 1, when the surface tension coefficient of the non-stick coating 12 is 18mN / m to 30mN / m, the resin tank 10 in the embodiment of the utility model can be applied to photosensitive resins of various viscosities.

[0041] In some embodiments, the heat resistance limit temperature of the non-stick coating 12 is 600 degrees Celsius to 800 degrees Celsius. Therefore, the non-stick coating 12 is resistant to high temperatures. The heat resistance limit temperature of the non-stick coating 12 can be tested by placing the non-stick coating 12 in different temperature environments.

[0042] In some embodiments, the non-stick coating 12 is corrosion resistant and can be resistant to strong acids. In particular, different types of liquids, resins of different viscosities, and resins of different temperatures can be placed in the resin tank 10 in the embodiment of the utility model to observe whether the non-stick coating 12 is deformed and whether the liquid is contaminated, so as to determine the corrosion resistance of the non-stick coating 12. For example, the test is performed according to the method in Table 2.

[0043] Table 2

[0044]

[0045] It can be seen from Table 2 that after the metal block covered with the non-stick coating 12 was in contact with the second photosensitive resin for one week at 50°C, no impurities appeared in the second photosensitive resin, and the appearance and performance of the non-stick coating 12 were not affected. After the metal block covered with the non-stick coating 12 was in contact with the second photosensitive resin for one week at room temperature, no impurities appeared in the second photosensitive resin, and the appearance and performance of the non-stick coating 12 were not affected. After the resin tank 10 was in contact with the ceramic slurry for about 72 hours at room temperature, no impurities appeared in the ceramic slurry, and the appearance and performance of the non-stick coating 12 were not affected. After the resin tank 10 was in contact with the first photosensitive resin for about 30 hours at 80°C, no impurities appeared in the first photosensitive resin, and the appearance and performance of the non-stick coating 12 were not affected. After the resin tank 10 was in contact with the third photosensitive resin for about 18 hours at 80°C, no impurities appeared in the third photosensitive resin, and the appearance and performance of the non-stick coating 12 were not affected. Therefore, the corrosion resistance of the non-stick coating 12 is good, and the appearance and performance of the non-stick coating 12 will not be affected by the photosensitive resin in the resin tank 10, and the photosensitive resin will not be contaminated.

[0046] In some embodiments, the thickness of the non-stick coating 12 is 30 um to 80 um, for example, the thickness of the non-stick coating 12 is 30 um or 80 um. Therefore, when the thickness of the formed non-stick coating 12 is within the aforementioned range, the non-stick coating 12 can have a desired non-stick life, and is beneficial to process control and cost control of the manufacturing process of the non-stick coating 12.

[0047] In some embodiments, the thermal conductivity of the non-stick coating 12 is 20w / (m·k) to 30w / (m·k), for example, the thermal conductivity of the non-stick coating 12 is 20w / (m·k) or 30w / (m·k). Therefore, when the thermal conductivity of the formed non-stick coating 12 is within the aforementioned range, the non-stick coating 12 can have a desired thermal conductivity effect, so that when the photosensitive resin in the resin tank 10 needs to be heated, the non-stick coating 12 can quickly conduct heat to the photosensitive resin.

[0048] In some embodiments, the smoothness of the non-stick coating 12 is 0.2 um to 1.6 um, for example, the smoothness of the non-stick coating 12 is 0.2 um or 1.6 um. Therefore, when the smoothness of the formed non-stick coating 12 is within the aforementioned range, the non-stick coating 12 can have a desired aesthetic effect, thereby improving the aesthetics of the resin tank 10.

[0049] The non-stick coating 12 in the embodiment of the present invention was tested as shown in Table 3.

[0050] Table 3

[0051]

[0052]

[0053] It can be seen from Table 3 that the hardness grade of the non-stick coating 12 is 7H. In the high and low temperature resistance test, the cyclic alternation test method is used to adjust the temperature between 160°C → -40°C for 20 cycles. The non-stick coating 12 has no cracks and no bubbles. Therefore, the non-stick coating 12 is resistant to high temperatures and low temperatures. In the humidity and heat resistance test, the non-stick coating 12 is placed in an environment with a temperature of (90±5)°C and a humidity of (96±2)%RH. After 1000 hours, there is no obvious change in the non-stick coating 12. Therefore, the humidity and heat resistance of the non-stick coating 12 is relatively high.

[0054] In the water resistance test, the non-stick coating 12 was placed in water at a temperature of (80±1)°C. After 48 hours, there was no significant change in the non-stick coating 12, so the water resistance of the non-stick coating 12 was relatively high. In the oil stain resistance test, oil pens (red, black, blue) and water pens were used to mark the non-stick coating 12. After 24 hours, the non-stick coating 12 was wiped with alcohol. There was no significant change in the non-stick coating 12, so the oil stain resistance of the non-stick coating 12 was relatively high. In the acid resistance test, 5% hydrochloric acid and 5% acetic acid were dripped onto the non-stick coating 12 respectively. In an environment with a temperature of 25°C, for 48 hours, there was no significant change in the non-stick coating 12, so the acid resistance of the non-stick coating 12 was relatively high. In the alkali resistance test, 10%10%NaCO3 was dripped onto the non-stick coating 12. In an environment with a temperature of 25°C, for 48 hours, there was no significant change in the non-stick coating 12, so the alkali resistance of the non-stick coating 12 was relatively high.

[0055] In the solvent resistance test, the non-stick coating 12 was immersed in alcohol for 128 hours, and there was no obvious change in the non-stick coating 12, so the solvent resistance of the non-stick coating 12 was relatively high. In the weather resistance test, an artificial accelerated light aging test was performed for 1000 hours, for example, an arc lamp or a carbon arc lamp was used to irradiate the non-stick coating 12 for 1000 hours, and the light loss rate of the non-stick coating 12 was ≤10%, and ΔE (color difference) was ≤1, so the durability of the non-stick coating 12 was relatively high. In the wear resistance test, the wear resistance of the non-stick coating 12 was tested by a grinding wheel wear test method, and the wear resistance of the non-stick coating 12 was level 3, and the wear resistance of the non-stick coating 12 was relatively high.

[0056] See also Figure 4 In some embodiments, the resin tank 10 further includes a heating component 14, which is disposed on the outer surface of the groove 14 and is used to heat the photosensitive resin contained in the groove 14. The inner surface of the groove 14 in the resin tank 10 in the embodiment of the utility model is provided with a non-stick coating 12, and the outer surface of the groove 14 is provided with a heating component 14, so that when the photosensitive resin needs to be poured out of the groove 14, the heated photosensitive resin can be poured out of the groove 14 more quickly, and the photosensitive resin will not stick to the resin tank, there is little or no resin residue in the resin tank, and the residual resin can be cleaned with a dry paper cloth, or the groove 14 can be heated by the heating component 14 so that the cleaning liquid left over from the cleaning can be evaporated, thereby ensuring the cleanliness of the resin tank and preventing the cleaning liquid from contaminating the resin poured in later.

[0057] In some embodiments, the heating assembly 14 may be evenly distributed on the outer surface of the groove 14, so as to evenly heat the photosensitive resin contained in the groove 14. The heating assembly 14 may include a heating plate that matches the size of the outer surface of the groove 14. It is understandable that each outer surface of the groove 14 may be provided with a heating plate that matches the size of the corresponding outer surface. For example, the groove 14 includes a first outer surface, a second outer surface, a third outer surface, and a fourth outer surface, the first outer surface is provided with a first heating plate, the second outer surface is provided with a second heating plate, the third outer surface is provided with a third heating plate, and the fourth outer surface is provided with a fourth heating plate.

[0058] See also Figure 5 , Figure 5 It is a structural schematic diagram of an embodiment of the light-curing 3D printing device of the utility model.

[0059] The device comprises: a resin tank 10, a resin tank moving mechanism 20, a light source and projection assembly 30, a film stretching assembly 40, a printing platform 50, a platform moving mechanism 60 and a control mechanism (not shown).

[0060] The resin tank 10 is used to contain liquid photosensitive resin; the resin tank moving mechanism 20 is used to carry and drive the resin tank 10 to move in the vertical direction; the light source and projection assembly 30 includes a projection lens (not shown) and a light outlet 31, and the light source and projection assembly 30 is used to provide a light source for the photosensitive resin undergoing a photocuring reaction, and guide the light source from the light outlet 31 to the photosensitive resin; the film stretching assembly 40 is arranged at the position of the light outlet 31, and the release film is located on the focusing plane of the projection lens 31; the printing platform 50 is used to support and fix the model formed by the curing of the photosensitive resin during the printing process; the platform moving mechanism 60 is used to carry and drive the printing platform 50 to move in the vertical direction to achieve continuous printing; the control mechanism is used to control the movement of the resin tank moving mechanism 20 and the platform moving mechanism 60.

[0061] The light source and projection assembly 30 may generally include an optical machine, an industrial camera, a beam splitter, a projection lens, and an optical path system connection structure; the light source driver and the spatial light modulator are built into the optical machine, and the optical machine projects ultraviolet light onto the beam splitter, which is then reflected to the projection lens by the beam splitter. The light path of the light source projected by the optical machine is perpendicular to the projection light path of the industrial camera and the projection lens, and the beam splitter is installed at 45 degrees on the center line of the light path of the industrial camera and the projection lens.

[0062] The optical machine is the main component that affects the light source, and the most important component in the optical machine is the micro display chip, which can be a reflective LCD screen or a digital optical demodulator. The reflective LCD screen is considered to have better image brightness and contrast than the traditional transmissive LCD screen. Each pixel of it will adjust the polarization state of the reflected light according to the applied voltage; and each pixel in the digital optical demodulator is a tiny reflector, which controls the direction of the reflected light by deflecting the micro mirror surface. Each lens in the digital optical demodulator can be deflected by -10° to 10°. In this way, the brighter pixels are the reflected light entering the lens, and the opposite is the dark pixel, that is, the grayscale of the image is controlled by the frequency of the lens deflection, and the chip in the digital optical demodulator has better ultraviolet compatibility and higher contrast than the liquid crystal chip. In some embodiments, the above-mentioned light source can adopt a DLP (Digital Light Processing) light source. By adopting a DLP light source, the accuracy of the product can be further improved.

[0063] In the embodiment of the utility model, the film assembly 40 is arranged at the position of the light outlet 31, and the release film of the film assembly 40 is located on the focal plane of the projection lens 31. Therefore, it is possible to avoid taking out the film assembly 40 before taking out the printed sample each time, and avoid leveling and focusing operations on the film assembly 40 before the next printing, thereby improving the stability and consistency of the printed product, and the inner surface of the resin tank 10 is provided with a non-stick coating, which can prevent the photosensitive resin from sticking to the inner surface of the resin tank 10, so that when the photosensitive resin is poured out of the resin tank, the photosensitive resin will not stick to the resin tank and can be poured out quickly. There is little or no resin residue in the resin tank, and the residual resin can be cleaned with a dry paper cloth.

[0064] It should be understood that the terms used in the description of the present invention are only for the purpose of describing specific embodiments but are not intended to limit the present invention.

[0065] It should also be understood that the term “and / or” used in the present specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0066] The above is only a specific embodiment of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A resin tank, applied to a light-curing 3D printing device, characterized in that: The resin tank comprises: A resin tank body, used for containing photosensitive resin; The non-stick coating is arranged on the inner surface of the resin tank body to prevent the photosensitive resin from sticking to the inner surface of the resin tank body.

2. The resin tank according to claim 1, characterized in that: The surface tension coefficient of the non-stick coating is 18 mN / m to 30 mN / m.

3. The resin tank according to claim 1, characterized in that: The heat resistance limit temperature of the non-stick coating is 600 degrees Celsius to 800 degrees Celsius.

4. The resin tank according to claim 1, characterized in that: The thickness of the non-stick coating is 30um to 80um.

5. The resin tank according to claim 1, wherein: The thermal conductivity of the non-stick coating is 20 w / (m·k) to 30 w / (m·k).

6. The resin tank according to claim 1, characterized in that: The smoothness of the non-stick coating is 0.2um to 1.6um.

7. The resin tank according to claim 1, characterized in that: The non-stick coating is a nano ceramic coating plated on the inner surface of the resin tank body.

8. The resin tank according to claim 1, characterized in that: The resin tank body is provided with a groove, and the non-stick coating includes a first non-stick coating provided on the inner surface of the groove and a second non-stick coating provided on the inner surface of the resin tank body, and the coatings used in the first non-stick coating and the second non-stick coating are the same or different.

9. The resin tank according to any one of claims 1 to 8, characterized in that: The resin tank further comprises: A heating component is arranged on the outer surface of the groove in the resin tank body and is used to heat the photosensitive resin contained in the groove.

10. A light-curing 3D printing device, characterized in that: The invention comprises a resin tank as claimed in any one of claims 1 to 9.

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