CN112318871A

CN112318871A - Light curing device and method

Info

Publication number: CN112318871A
Application number: CN201910717921.2A
Authority: CN
Inventors: 屈阳; 黄鹤源; 罗铭; 桂培炎
Original assignee: Guangzhou Him3d Information Technology Co ltd
Current assignee: Guangzhou Him3d Information Technology Co ltd
Priority date: 2019-08-05
Filing date: 2019-08-05
Publication date: 2021-02-05

Abstract

The invention discloses a light curing device and a method, wherein the light curing device comprises a shell, a transparent inner box and a curing lamp, the transparent inner box is arranged inside the shell, and the curing lamp is arranged between the shell and the transparent inner box and positioned around the transparent inner box; the transparent inner box is used for containing a specific liquid, and the specific liquid is configured to: does not react with the photosensitive resin, has a lower dissolved oxygen rate than water, and is transparent. The light curing device and the light curing method can further improve the surface quality of products and improve the surface curing effect.

Description

Light curing device and method

Technical Field

The invention relates to the technical field of additive manufacturing, in particular to a photocuring device and a photocuring method.

Background

Currently, the application of the photo-curing 3D printing technology is becoming widespread. The photo-curing 3D printing technique is to cure a photosensitive resin liquid with ultraviolet light or other light beams. However, the workpiece produced by just performing photocuring 3D printing has low strength, cannot meet the use requirement, and needs to be subjected to secondary curing to improve the properties of the product such as hardness.

Patent document CN107962779A discloses an underwater photocuring system capable of performing secondary curing on a photocuring 3D printed product. The underwater light curing system is characterized in that a product to be cured is placed in a transparent water tank; the periphery of transparent water tank has ultraviolet light subassembly, and this ultraviolet light subassembly shines the product of treating curing that is located transparent water tank to promote the hardness of treating the curing product.

However, the surface quality and the surface curing effect of the product obtained by curing the above technical scheme still need to be improved.

Disclosure of Invention

The invention mainly aims to provide a light curing device and a light curing method, which can further improve the surface quality of a product and improve the surface curing effect.

According to an aspect of an embodiment of the present invention, there is provided a light curing apparatus. The photo-curing device includes:

a housing;

a transparent inner case disposed inside the outer case;

a curing light disposed between the outer shell and the transparent inner case;

the transparent inner box is used for containing a specific liquid, and the specific liquid is configured to: does not react with the photosensitive resin, has a lower dissolved oxygen rate than water, and is transparent.

Further, the light curing device further comprises a pressing device for pressing down the workpiece to be cured so that the workpiece to be cured can be immersed in the specific liquid.

Further, the specific liquid is an organic solvent, and the organic solvent includes at least one of an alcohol solvent, a silicone oil solvent, or a paraffin wax solvent.

Further, the alcohol solvent comprises at least one of ethanol, butanediol, propylene glycol, glycerol or polyethylene glycol with the number average molecular weight of 200-600.

Further, the silicone oil solvent comprises at least one of methyl silicone oil, hydrogen-containing silicone oil, water-soluble silicone oil or benzyl silicone oil.

Further, the paraffin-based solvent includes at least one of liquid paraffin or liquid chlorinated paraffin.

Further, the pressing device is a pressing block for placing on the workpiece to be solidified so that the workpiece to be solidified can be immersed in the specific liquid.

Further, the pressing device is a clamping arm, and the clamping arm is used for clamping the workpiece to be solidified.

Furthermore, the pressing device is a rope, one end of the rope is fixed at the bottom of the transparent inner box, and the other end of the rope is used for connecting the workpiece to be cured.

Further, a mirror surface box body is arranged between the outer shell and the transparent inner box, the curing lamp is arranged on the surface of the mirror surface box body facing the transparent inner box, and a radiator is arranged on the surface of the mirror surface box body facing the outer shell.

Furthermore, a fan is arranged between the shell and the mirror surface box body, and an air outlet is formed in the position, corresponding to the radiator, of the shell, so that an air channel is formed between the shell and the mirror surface box body.

Furthermore, the light curing device is provided with a cooling pipeline, and a cooling medium flows through the cooling pipeline.

Further, the cooling pipeline is a hollow inner cavity structure integrated in the transparent inner box, or the cooling pipeline is a separate pipeline.

Further, the light curing device also comprises an upper cover, and the upper cover and the shell are matched to form a closed space.

Further, the lower pressing block is replaced by an upper cover, and the upper cover is matched with the shell through a hinge and can be opened and closed; the upper cover is used for ensuring that the workpiece to be solidified is immersed in the specific liquid.

Further, the light curing device is also provided with a detection device, and the detection device is used for judging whether the upper cover is in an opening state or a closing state.

According to another aspect of an embodiment of the present invention, there is provided a photo-curing method. The light curing device adopted by the light curing method comprises:

a housing;

a transparent inner case disposed inside the outer case;

a curing light disposed between the outer shell and the transparent inner case;

the photo-curing method comprises the following steps:

placing a workpiece to be cured in the transparent inner box, the transparent inner box containing a specific liquid therein, the specific liquid being configured to: does not react with photosensitive resin, has lower dissolved oxygen rate than water and is transparent;

and irradiating the workpiece to be cured by a curing lamp.

The light curing device and the light curing method in the embodiment of the invention at least have the following beneficial effects: the transparent specific liquid is immersed in the workpiece to be cured, so that the workpiece to be cured can be irradiated by ultraviolet light and other light beams although the workpiece to be cured is surrounded by the specific liquid, and secondary curing is realized; the specific liquid is less dissolved with oxygen than water, so that the influence of the dissolved oxygen in the water on the surface curing effect of the product is reduced; the photosensitive resin material does not react with the photosensitive resin material, and can be separated from the surface of the resin material in a cleaning manner, so that the damage of the surface quality of a product caused by chemical reaction is avoided.

Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 is a schematic structural diagram of a light curing device according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a light-curing device according to a modified embodiment of the embodiment shown in FIG. 1;

FIG. 3 is a schematic structural diagram of a light curing device according to another embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a light curing device according to another embodiment of the present invention;

FIG. 5 is a schematic structural view of a light-curing device according to an alternative embodiment of the embodiment shown in FIG. 2;

FIG. 6 is a schematic structural view of a light-curing device according to another alternative embodiment of the embodiment shown in FIG. 2;

FIG. 7 is a schematic structural view of a light-curing device according to yet another alternative embodiment of the embodiment shown in FIG. 2;

fig. 8 is a schematic top view structure diagram of a light curing device according to another embodiment of the invention.

Reference numerals: in the figure, the position of the upper end of the main shaft,

110-a workpiece to be cured; 120-a specific liquid; 130-a housing; 140-a transparent inner box; 141-a cooling circuit; 150-UV lamp; 170-upper cover;

210-a workpiece to be cured; 220-a specific liquid; 230-a housing; 240-transparent inner box; 241-a cooling pipeline; 250-UV lamp; 260-briquetting; 270-upper cover;

310-a workpiece to be cured; 320-a specific liquid; 330-a housing; 340-a transparent inner box; 341-cooling circuit; 350-UV lamp; 360-a clamping arm; 370-upper cover;

410-a workpiece to be cured; 420-a specific liquid; 430-a housing; 440-a transparent inner box; 441-a cooling circuit; 450-UV lamps; 460-a rope; 470-upper cover;

510-a workpiece to be solidified; 520-a specific liquid; 530-a housing; 540-transparent inner box; 541-a cooling pipeline; 550-UV lamp; 560-a gripper arm; 570-upper cover; 580-beaker;

610-a workpiece to be cured; 620-specific liquid; 630-a housing; 640-a transparent inner box; 650-UV lamp; 660-briquetting; 670-upper cover;

710-a workpiece to be cured; 720-specific liquid; 730-a housing; 740-a transparent inner box; 750-UV lamps; 770-an upper cover; 771-hinge;

830-a housing; 831-fan; 832-air outlet; 840-transparent inner box; 850-UV lamp; 890-mirror box; 891-radiator.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "length", "width", "barrier", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used for convenience of description and simplicity of description only, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more features.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the term "connected" is to be interpreted broadly, e.g. as a fixed connection or a movable connection, as well as a detachable connection or a non-detachable connection, or as an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship.

In the description of the present invention, the term "transparent" is understood to mean that the object is transparent to light and that the object is capable of being transparent to light (e.g., ultraviolet light) emitted from a curing lamp. In other words, an object may be considered transparent if it does not block or not filter the light emitted by the curing light under the concept of the present invention.

The following text will describe the light curing device in some embodiments of the invention with reference to the drawings of the specification.

Fig. 1 is a schematic structural diagram of a light curing device in an embodiment of the present invention. As shown in fig. 1, the workpiece 110 to be cured can be placed below the level of a particular liquid 120 contained in the curing apparatus. The workpiece to be cured 110 is a molded part obtained by photocuring 3D printing, and the photocuring 3D printing includes but is not limited to DLP 3D printing, SLA 3D printing and LCD 3D printing.

The specific liquid 120 has the following characteristics: transparent, has a lower dissolved oxygen rate than water and does not react with the photosensitive resin. It is to be understood that the particular liquid provided by the present invention is not pure water. Preferably, the particular liquid 120 also has cleaning-friendly properties that make it less likely to adhere to the surface of the workpiece 110 to be cured.

Specifically, the specific liquid 120 is an organic solvent having a low oxygen content, and includes at least one of an alcohol-based solvent (particularly, a low molecular weight alcohol-based solvent), a silicone oil-based solvent, and a paraffin-based solvent. The alcohol solvent may be ethanol, butylene glycol, propylene glycol, glycerol or polyethylene glycol having a number average molecular weight of 200 to 600, the silicone oil solvent may be methyl silicone oil, hydrogen-containing silicone oil, water-soluble silicone oil or benzyl silicone oil, and the paraffin solvent may be liquid paraffin or liquid chlorinated paraffin.

The photo-curing apparatus includes an outer case 130, a transparent inner case 140, a cooling pipe 141, a UV lamp 150, and an upper cover 170, wherein the transparent inner case 140 is located inside the outer case 130.

The housing 130 has an open top structure, preferably a rectangular parallelepiped structure. Alternatively, the housing 130 may have other shapes such as a cylinder.

The transparent inner case 140 is used to contain the specific liquid 120. Preferably, the transparent inner case 140 is similar in structure to the outer case 130. For example, in the case where the outer casing 130 has a rectangular parallelepiped structure, the transparent inner case 140 also has a rectangular parallelepiped structure, and the corresponding dimensions of the transparent inner case 140 and the outer casing 130 are in the same ratio.

As shown in fig. 1, a hollow inner chamber is provided in the wall of the transparent inner case 140, and the hollow inner chamber forms a cooling line 141. A cooling medium flows through the cooling line 141. The cooling medium is liquid or gas. The light curing device in this embodiment is provided with a cooling pipeline because certain liquids may have poor heat dissipation performance and the curing lamp in the light curing process generates heat. It can be understood that the cooling pipeline can be a hollow inner cavity structure integrated in the transparent inner box, and can also be a separate pipeline; the cooling pipeline can be arranged on the inner surface of the transparent inner box and also can be arranged on the outer surface of the transparent inner box.

A plurality of UV lamps 150 are installed at an inner wall surface of the housing 130. "plurality" means at least two. A plurality of UV lamps 150 surround the transparent inner case 140. As shown in fig. 1, the bottom of the transparent inner case 140 (i.e., the bottom surface of the inner wall of the outer case 130) is provided with a UV lamp 150 to irradiate the workpiece 110 to be cured at a plurality of angles. Further, a UV lamp may be provided on the upper cover. Further, in order to make the surface of the workpiece to be cured uniformly irradiated, the transparent inner case may be configured to be rotatable with respect to the housing.

It is understood that, in addition to the UV lamp, other curing lamps such as visible light curing lamps may be used as the curing lamp; multiple UV lamps can also be integrated directly into one large UV lamp.

The upper cover 170 is positioned at the uppermost of the entire photo-curing device. Specifically, the upper cover 170 covers the open top of the housing 130. The upper cover 170 and the housing 130 cooperate with each other to form a closed space. The closed space can block other light except the curing lamp, and the curing effect of secondary curing is not influenced by other light.

Fig. 2 is a schematic structural view of a light curing device according to a modified embodiment of the embodiment shown in fig. 1. The light-curing apparatus shown in fig. 2 includes an outer case 230, a transparent inner case 240, a cooling pipe 241, a UV lamp 250, and an upper cover 270. The connection relationship, the mutual position relationship and the effect of the above components are the same as the technical solution of the embodiment shown in fig. 1, and are not described herein again.

The technical solution of the embodiment shown in fig. 2 is different from that shown in fig. 1 in that the light curing device shown in fig. 2 further includes a pressing block 260.

The hold-down block 260 is used to ensure that the workpiece 210 to be cured is submerged below the level of the particular liquid 220. The lower pressure block 260 is located above the workpiece to be cured 210, so that the workpiece to be cured 210 cannot float up to above the liquid level.

In some cases, the density of the specific liquid 120 is greater than that of the workpiece 110 to be cured (for example, in the embodiment shown in fig. 2), and the light curing device needs to be provided with a pressure-reducing block 160 to ensure that the workpiece 110 to be cured does not float upward.

In other cases, the density of the specific liquid is lower than that of the workpiece to be cured (for example, in the embodiment shown in fig. 1), and the workpiece to be cured can sink spontaneously into the specific liquid, so that the light curing device does not need to be provided with a pressure-reducing block.

The lifting movement of the depressing block 260 is controlled by a driving means (not shown), which may be a motor or an air cylinder.

Fig. 3 is a schematic structural diagram of a light curing device in another embodiment of the present invention. The photo-curing apparatus shown in fig. 3 includes an outer case 330, a transparent inner case 340, a cooling pipe 341, a UV lamp 350, and an upper cover 370. The connection relationship, the mutual position relationship and the effect of the above components are the same as the technical solution of the embodiment shown in fig. 2, and are not described herein again.

The embodiment shown in fig. 3 differs from that shown in fig. 2 in that the lower press block 260 shown in fig. 2 is replaced by a clamp arm 360 in fig. 3.

The clamp arm 360 has a pair of clamps that can clamp the workpiece 310 to be cured from above so that the workpiece 310 to be cured cannot float above the level of the specific liquid 320. The bottom of the clamping arm 360 is fixed on the bottom surface of the inner wall of the transparent inner box 340. It will be appreciated that the gripper arms 360 may take the form of gripper robots, whereby the opening and closing of the jaws of the gripper arms 360 may be controlled and driven.

Alternatively, the clamp of the clamp arm 360 may also clamp the workpiece 310 to be cured from below, while the top of the clamp arm 260 is fixedly mounted to the photo-curing device; alternatively, the clamp of the clamp arm 360 clamps the workpiece 310 to be cured from the left thereof, while the right end of the clamp arm 360 is fixed; alternatively, the clamp of the clamp arm 360 clamps the workpiece 310 to be cured from the right thereof, while the left end of the clamp arm 360 is fixed.

Fig. 4 is a schematic structural diagram of a light curing device in another embodiment of the present invention. The light-curing apparatus shown in fig. 4 includes an outer case 430, a transparent inner case 440, a cooling pipe 441, a UV lamp 450, and an upper cover 470. The connection relationship, the mutual position relationship and the effect of the above components are the same as the technical solution of the embodiment shown in fig. 2, and are not described herein again.

The embodiment shown in fig. 4 differs from that shown in fig. 2 in that the depressing block 260 shown in fig. 2 is replaced with a rope 460 shown in fig. 4.

One end of the rope 460 is fixed to the inner wall surface of the transparent inner case 440, and the other end is used for connecting the workpiece 410 to be cured. The work piece 410 to be cured cannot move upward under the pulling force of the underlying rope 460, thereby ensuring that the work piece 410 to be cured is submerged below the level of the particular liquid 420.

Fig. 5 is a schematic structural diagram of a light curing device according to an alternative embodiment of the embodiment shown in fig. 2. The light-curing apparatus shown in fig. 5 includes an outer case 530, a transparent inner case 540, a cooling pipe 541, a UV lamp 550, a lower press block 560, and an upper cover 570. The connection relationship, the mutual position relationship and the effect of the above components are the same as the technical solution of the embodiment shown in fig. 2, and are not described herein again.

The technical solution of the embodiment shown in fig. 5 is different from that shown in fig. 2 in that the light curing device shown in fig. 5 further has a beaker 580. A beaker 580 is placed in the transparent inner case 540, and the beaker 580 is used for containing the specific liquid 520. Compared with the technical scheme that the transparent inner box is used for containing specific liquid, the beaker is easier to clean.

Fig. 6 is a schematic structural view of a light curing device according to another alternative embodiment of the embodiment shown in fig. 6. The light-curing apparatus shown in fig. 6 includes an outer case 630, a transparent inner case 640, a UV lamp 650, a lower press block 660, and an upper cover 670. The connection relationship, the mutual position relationship and the effect of the above components are the same as the technical solution of the embodiment shown in fig. 2, and are not described herein again.

The technical solution of the embodiment shown in fig. 6 is different from that shown in fig. 2 in that the lower pressing block 660 shown in fig. 6 has an inverted truncated cone shape, i.e., the area of the top surface of the lower pressing block 660 is larger than that of the bottom surface. It is understood that the lower press block may alternatively be dish-shaped or have other shapes.

Fig. 7 is a schematic structural view of a light curing device according to yet another alternative embodiment of the embodiment shown in fig. 2. The light curing apparatus shown in fig. 7 includes an outer case 730, a transparent inner case 740, a UV lamp 750, and an upper cover 770. The connection relationship, the mutual position relationship and the effect of the above components are the same as the technical solution of the embodiment shown in fig. 2, and are not described herein again.

The technical solution of the embodiment shown in fig. 7 is different from that shown in fig. 2 in that the upper cover 770 of the former has the function of a lower pressing block, i.e. the upper cover and the lower pressing block are combined into a whole. As shown in fig. 7, the bottom surface of the upper cover 770 has a significant downwardly convex region for blocking the work 710 to be solidified, which is immersed in the specific liquid 720, from floating above the liquid surface.

Fig. 7 also shows that the matching relationship between the upper cover 770 and the housing 730 is a hinge connection, which facilitates the assembly of the upper cover 770 and the housing 730. Specifically, the upper cover 770 is provided with a hinge 771 at a contact portion of one end (e.g., left end) thereof with the housing 730, so that the upper cover 770 can rotate about a rotation axis of the hinge 771 to open and close the upper cover 770.

In order to avoid the damage to the user caused by the strong light of the UV lamp to the eyes of the user when the upper cover is opened, the light curing device is also provided with a detection device, and the detection device is used for judging whether the upper cover is in an opening state or a closing state.

When the detection device detects that the upper cover is in an open state, the UV lamp in the photocuring device stops working. Optionally, the hold-down device is deactivated or the workpiece to be solidified is floated in another way. Therefore, the workpiece can be conveniently taken by the user without hurting the user, and the use experience of the user is improved. And when the detection device detects that the upper cover is in a closed state, the UV lamp starts to work, and the workpiece to be cured is cured.

The detection means may be a sensor or a switch. The sensor may be an infrared sensor and the switch may be a touch-selectable switch, such as a push button or a travel switch. Preferably, the detection device is disposed between the upper cover and the housing, and the specific arrangement manner can be specifically designed according to the structure of the light curing device, which is not described herein in detail.

Specifically, in the embodiment shown in fig. 7, after the user opens the upper cover, the UV lamp stops working under the action of the detection device, the upper cover does not press the workpiece to be cured into specific liquid, the workpiece to be cured can float upwards automatically, and the user experience is further improved.

Fig. 8 is a schematic top view diagram of a light curing device according to another embodiment of the present invention. The light curing apparatus shown in fig. 8 includes an outer case 830, a transparent inner case 840, and a UV lamp 850. The horizontal projections of both the outer casing 830 and the transparent inner case 840 in fig. 8 are concentric circles. The connection relationship, the mutual position relationship and the effect of the above components are the same as those of the foregoing technical solutions of some embodiments, and are not described herein again.

The technical solution of the embodiment shown in fig. 8 is different from that of some of the previous embodiments in that a mirror box 890 is further disposed between the outer casing 830 and the transparent inner box 840 shown in fig. 8. The mirror surfaces of the mirror housing can enhance reflection so that the illumination from the UV lamp 850 is more uniform, thereby further improving the curing effect.

The horizontal projection of mirrored housing 890 is prismatic (e.g., regular octagon). The circumscribed circle of the horizontal projection profile of the mirror surface case 890, the horizontal projection of the outer housing 830 and the horizontal projection of the transparent inner case 840 are concentric circles, which are sequentially the horizontal projection of the transparent inner case 840, the circumscribed circle of the horizontal projection profile of the mirror surface case 890 and the horizontal projection of the outer housing 830 from the inside to the outside.

The inner wall surface of mirror surface box 890 is the mirror surface, and this inner wall surface is last to install UV lamp 850, and the lamp pearl of UV lamp 850 sets up towards the inside of mirror surface box 890.

The outer wall surface of mirror housing 890 is also provided with heat sink 891, and heat sink 891 is disposed toward the outside of mirror housing 890. The heat sink 891 is used to dissipate heat generated by the operation of the UV lamp 850.

A fan 831 is provided between the housing 830 and the mirror housing 890. More specifically, the inner wall surface of the housing 830 is provided with a fan 831. The housing 830 is further provided with an air outlet 832 at a position opposite to the corresponding heat sink 891. Accordingly, an air duct (the flow direction of the air is shown by the arrow in fig. 8) is formed between the housing 830 and the mirror housing 890, thereby dissipating heat from the heat sink 891.

It will be appreciated that the arrangement shown in the embodiment of figure 8 can be combined with any of the embodiments described above.

The following text will describe the photocuring process in some embodiments of the invention.

The photocuring method comprises the following steps:

1) placing a workpiece obtained by 3D printing in a closed space (a closed space formed by matching a transparent inner box and an upper cover or a closed space formed by matching a beaker and the upper cover) in the photocuring device in any embodiment of the invention, and immersing the workpiece in a specific liquid;

2) the work is irradiated with ultraviolet light to perform secondary curing.

The workpiece to be solidified is immersed in the specific liquid, the specific liquid does not dissolve or slightly dissolves oxygen, the oxygen can be isolated to the maximum extent, the influence of the oxygen on the solidification effect is reduced, and the specific liquid does not react with the photosensitive resin and can be separated from the surface of the workpiece in a cleaning mode.

The photocuring method has at least the following beneficial effects: the transparent specific liquid is immersed in the workpiece to be cured, so that the workpiece to be cured can be irradiated by ultraviolet light and other light beams although the workpiece to be cured is surrounded by the specific liquid, and secondary curing is realized; the specific liquid is less dissolved with oxygen than water, so that the influence of the dissolved oxygen in the water on the surface curing effect of the product is reduced; the photosensitive resin does not react with the photosensitive resin, and can be separated from the surface of a workpiece in a cleaning mode, so that the damage of the surface quality of a product caused by chemical reaction is avoided.

The effect test method and the test result of the photocuring method are as follows:

1) selecting photosensitive resin to print a plurality of cake-shaped workpieces to be cured, wherein the cake-shaped workpieces to be cured have the diameters of 115mm and the thicknesses of 4 mm;

2) placing a cake-shaped workpiece to be solidified in a cleaning solution, ultrasonically cleaning for 3min, and taking out;

3) putting a cake-shaped workpiece to be cured into a photocuring device shown in fig. 2, selecting glycerol with the purity of 99.5% as specific liquid, completely pressing the cake-shaped workpiece to be cured into the glycerol by using a lower pressing block, starting a UV lamp for curing for 7min, taking out the workpiece, cleaning the workpiece by using clear water, and drying the workpiece to obtain a test sample 1;

4) referring to the operation of the step 3), replacing glycerol with the purity of 99.5% with glycerol with the purity of 95%, and keeping the rest unchanged to obtain a test sample 2;

5) referring to the operation of the step 3), replacing glycerol with the purity of 99.5% with liquid paraffin with the purity of 99%, and keeping the rest unchanged to obtain a test sample 3;

6) referring to the operation of step 3), replacing glycerol with the purity of 99.5% with water, and keeping the rest unchanged to obtain a comparative sample 1;

7) a cake-shaped workpiece to be cured was placed in the photo-curing apparatus shown in FIG. 2 (no specific liquid was contained in the apparatus), the apparatus was filled with nitrogen gas, a UV lamp was turned on to cure for 7min, and the workpiece was taken out to obtain a comparative sample 2.

The results of the abrasion resistance tests performed on the test samples 1-3 and the comparative samples 1-2 according to the test method for the abrasion resistance of the surface of transparent plastic of ASTM D1044-2005 are shown in the following table:

TABLE 1 abrasion loss test results for test samples 1-3 and comparative samples 1-2

Sample number	Amount of abrasion (mg)
		Test specimen 1	39.7
Test specimen 2	17.3
		Test specimen 3	24.0
Comparative sample 1	243.1
		Comparative sample 2	69.5

As can be seen from Table 1: and (3) immersing the workpiece to be cured in glycerol or liquid paraffin for secondary curing, wherein compared with the step of immersing the workpiece to be cured in water or placing the workpiece to be cured in a nitrogen atmosphere for secondary curing, the obtained workpiece has smaller abrasion loss, namely, the surface curing effect is better. Therefore, the light curing device and the light curing method can further improve the surface quality of the product and improve the surface curing effect.

In the description herein, references to the description of the terms "one embodiment," "another embodiment," or "certain embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A light-curing device comprising:

a housing;

a transparent inner case disposed inside the outer case;

a curing light disposed between the outer shell and the transparent inner case;

it is characterized in that the preparation method is characterized in that,

2. The light-curing device according to claim 1, further comprising a pressing device for pressing down the workpiece to be cured so that the workpiece to be cured is immersed in the specific liquid.

3. The photo-curing device of claim 1, wherein the specific liquid is an organic solvent, and the organic solvent includes at least one of an alcohol solvent, a silicone oil solvent, or a paraffin solvent.

4. The photo-curing device according to claim 3, wherein the alcohol solvent includes at least one of ethanol, butylene glycol, propylene glycol, glycerin, and polyethylene glycol having a number average molecular weight of 200 to 600.

5. The photo-curing device according to claim 3, wherein the silicone oil-based solvent includes at least one of methyl silicone oil, hydrogen-containing silicone oil, water-soluble silicone oil, or benzyl silicone oil.

6. The photo-curing device according to claim 3, wherein the paraffin-based solvent includes at least one of liquid paraffin or liquid chlorinated paraffin.

7. The curing apparatus according to claim 2, wherein the pressing means is a pressing block for being placed on the workpiece to be cured such that the workpiece to be cured is immersed in the specific liquid.

8. The curing light of claim 2, wherein said pressing means is a clamping arm for clamping said workpiece to be cured.

9. The curing apparatus of claim 2, wherein the pressing device is a rope, one end of the rope is fixed to the bottom of the transparent inner box, and the other end of the rope is used for connecting the workpiece to be cured.

10. The photo-curing device of claim 1, wherein a mirror housing is disposed between the outer housing and the transparent inner housing, the mirror housing being provided with the curing lamp on a surface facing the transparent inner housing, the mirror housing being provided with a heat sink on a surface facing the outer housing.

11. The photo-curing device of claim 10, wherein a fan is disposed between the housing and the mirror box, and an air outlet is disposed at a position of the housing opposite to the heat sink, so that an air channel is formed between the housing and the mirror box.

12. The curing apparatus according to claim 3, wherein a cooling line is provided in the curing apparatus, and a cooling medium is circulated in the cooling line.

13. The curing light of claim 12, wherein the cooling circuit is a hollow interior structure integrated into the transparent inner box or the cooling circuit is a separate tube.

14. The curing light of claim 1, further comprising a cover, wherein the cover cooperates with the housing to form a closed space.

15. The photocuring device of claim 7, wherein the lower pressing block is replaced by an upper cover which is hinged with the shell and can be opened and closed; the upper cover is used for ensuring that the workpiece to be solidified is immersed in the specific liquid.

16. The curing apparatus of claim 15, wherein the curing apparatus is further provided with a detecting device for determining whether the upper cover is in the open state or the closed state.

17. A photocuring method, characterized in that a photocuring device adopted by the photocuring method comprises:

a housing;

a transparent inner case disposed inside the outer case;

a curing light disposed between the outer shell and the transparent inner case;

the photo-curing method comprises the following steps:

and irradiating the workpiece to be cured by a curing lamp.

18. The photocuring method according to claim 17, wherein the specific liquid is an organic solvent, and the organic solvent includes at least one of an alcohol-based solvent, a silicone-oil-based solvent, and a paraffin-based solvent.