A rapid light-cured DLP 3D printing device

Abstract

The application discloses a kind of fast photocuring DLP 3D printing equipment, including rack and install on rack light source, reflector, resin tank support plate, resin tank and Z-axis movement module, light source and reflector are located in the lower layer of rack, resin tank support plate is installed in the upper layer of rack, resin tank is located directly above reflector, Z-axis movement module is connected with motion forming platform, the center point of the lower surface of motion forming platform coincides with the center point of resin tank, the bottom of resin tank has air-permeable microporous transparent film.Air is used as polymerization inhibitor, so that a layer of forming dead zone is formed between the resin tank and the bottom surface of the forming resin, so that the resin will not adhere to the resin tank during the curing and forming process, and the forming platform does not need to be repeatedly pulled up and down, the resin can be continuously pulled up for fast printing.Microporous transparent film uses microporous glass or microporous plastic film, so that air is used as polymerization inhibitor, without the need to prepare oxygen ions and without the need for a special oxidation penetration window, which can greatly reduce the investment and use cost of the equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of 3D printing equipment, specifically to a kind of fast light-cured DLP 3D printing equipment. BACKGROUND

[0002] In today's society, traditional industrial production process sometimes is difficult to meet the needs of industrial production, light curing as a new type of 3D printing means, can effectively solve the above problems.3D printing as a method of additive manufacturing, compared with the subtractive manufacturing in industry has better development prospect.Light curing technology has been applied to various fields, including aerospace, construction, medical, abrasive tool manufacturing and so on.

[0003] Early light-cured molding technology is using SLA to cure, printing speed is slow, precision is not high, and using DLP to carry out light-cured molding greatly improves printing speed and printing accuracy, but the printing device of the technology needs to move up and down constantly to tear, so that the cured resin layer and the transparent film at the bottom of the resin tank are separated, and when the resin is filled again, it is cured again, so the molding time is long, and the printed object is prone to deformation in the repeated tearing process.

[0004] The transparent film used in Continuous liquid interface production of 3D objects published by John R.Tumbleston et al in Science is an oxygen ion exchange film made of AF2400.Due to the presence of oxygen ions, a molding dead zone is formed, so that the cured resin layer and the transparent film at the bottom of the resin tank are not adhered, and repeated tearing is not needed, so that continuous lifting, fast printing and non-deformation of the printed object can be achieved.However, oxygen ion exchange film is expensive, and there is currently no technology to process the transparent ion exchange film in China, and AF2400 transparent ion exchange film cannot be bought abroad. SUMMARY

[0005] The main purpose of the present application is to provide a fast light-cured DLP 3D printing equipment with low investment cost, which can realize continuous lifting of light-cured resin and improve printing speed.

[0006] The fast light-cured DLP 3D printing equipment provided by the present application comprises a rack, a light source, a mirror, a resin tank support plate, a resin tank and a Z-axis motion module mounted on the rack, the light source and the mirror are located at the bottom of the rack, the resin tank is fixed on the resin tank support plate corresponding to the top of the mirror, the bottom of the resin tank has a transparent film, and the Z-axis motion module is connected with a motion forming platform.The transparent film is a microporous transparent film that air can pass through, and the center point of the lower surface of the motion forming platform coincides with the center point of the resin tank.

[0007] The transparent mold is a microporous glass or microporous plastic mold.

[0008] The resin tank comprises an upper frame, a lower frame and the transparent mold, and the transparent film is located between the upper frame and the lower frame, and the upper frame and the lower frame are detachably fastened to position the transparent film.

[0009] The Z-axis movement module is a screw rod sliding table controlled by a stepper motor, and is connected to one side of the resin tank at the upper end of the frame.

[0010] The movement forming platform comprises a forming platform and a connecting head connected to the upper side of the forming platform, and the forming platform is arranged in parallel with the resin tank, and the connecting head is detachably connected with the sliding table of the screw rod sliding table.

[0011] The forming platform is processed from an aluminum alloy plate.

[0012] The light source is the light source of an ultrahigh pressure mercury lamp projector.

[0013] The reflector is an aluminum-coated mirror obtained by evaporation technology.

[0014] The resin tank support plate is a nylon plate engraved by a laser engraving machine, and has a light transmission hole corresponding to the transparent mold.

[0015] The frame is a frame structure assembled from aluminum profiles.

[0016] In the present application, the transparent film at the bottom of the resin tank adopts a microporous membrane through which air can pass, and air is used as a polymerization inhibitor to form a dead zone between the resin tank and the bottom surface of the formed resin, so that the cured resin layer and the transparent film at the bottom of the resin tank are not adhered, and the resin can be continuously pulled up without the need for the forming platform to move up and down to tear, thereby achieving rapid printing. The continuous curing and forming of the resin during printing can avoid deformation of the printed body. Air as a polymerization inhibitor directly passes through the microporous membrane without the need for oxygen ions and without the need for a special oxygen permeation window, so that the equipment structure is simpler, and the investment and use cost of the equipment is reduced. The microporous mold adopts a microporous glass or microporous plastic membrane, which has a much lower cost than the oxygen ion exchange membrane of the prior art, and can greatly reduce the investment cost of the equipment.

[0017] In summary, the present application uses a microporous transparent film at the bottom of the resin tank, uses inexpensive air as a polymerization inhibitor, forms a dead zone between the resin tank and the bottom surface of the formed resin, solves the problem of repeated movement of the forming platform during printing of the prior art, enables the resin to be continuously cured and formed, reduces the equipment investment cost, and improves the printing speed and printing quality. The microporous transparent film can completely replace the AF2400 oxygen ion exchange membrane, but has much lower cost. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1The front view schematic diagram of one embodiment of the present application.

[0019] Figure 2 The Figure 1 The schematic diagram of the axial structure of the resin tank.

[0020] Figure 3 The Figure 1 The schematic diagram of the axial structure of the resin tank.

[0021] Figure 4 The schematic diagram of the printing principle of the present embodiment.

[0022] The serial number in the figure:

[0023] 1 - Z-axis movement module; 11 - stepper motor; 12 - screw rod; 13 - connecting rod; 14 - sliding table;

[0024] 2 - movement forming platform; 21 - forming platform; 22 - connecting head;

[0025] 3 - resin tank; 31 - lower frame; 32 - upper frame;

[0026] 4 - reflector;

[0027] 5 - rack;

[0028] 6 - resin tank support plate;

[0029] 7 - light source. DETAILED DESCRIPTION

[0030] In combination Figure 1 And Figure 3 It can be seen that the rapid light-curing DLP 3D printing equipment disclosed in the present embodiment comprises a Z-axis movement module 1, a movement forming platform 2, a resin tank 3, a reflector 4, a rack 5, a resin tank support plate 6, and a light source 7.

[0031] The rack 5 of the present embodiment is a frame structure assembled by using Euro-standard 2020 aluminum profiles. The Euro-standard 2020 aluminum profiles have good straightness, which can ensure that the rack has good flatness, so as to ensure the vertical flatness of the Z-axis movement module and the horizontal flatness of the resin tank, and finally ensure the quality of the printed body.

[0032] In addition, the 2020 aluminum profile is provided with a longitudinal groove, which facilitates the quick installation and fixation of the reflector and the resin tank support plate on the rack.

[0033] The light source 7 and the reflector 4 are both installed on the lower layer of the rack 5, and the light source and the reflector are in the same plane.

[0034] The light source 7 of the embodiment adopts the light source of the super high pressure mercury lamp projector with the color wheel removed. The brightness of the light source can reach 3000 lumens, which can greatly ensure the definition of the projected picture, thereby improving the printing precision. The reflector of the embodiment adopts the aluminum-coated mirror obtained by the evaporation technology.

[0035] In combination Figure 1 and Figure 3 As can be seen, the resin tank support plate 6 is detachably connected to the upper layer of the rack 5 by screws, and the resin tank 3 is fixed to the resin tank support plate 6 corresponding to the position directly above the reflector 4, so that the reflector reflects the image of the light source on the bottom of the resin tank clearly.

[0036] From Figure 2 As can be seen, the resin tank 3 includes a lower frame 31, an upper frame 32 and a microporous transparent film (not shown in the figure). Figure 2 The periphery of the microporous transparent film is located between the lower frame and the upper frame, and the lower frame and the upper frame are fastened by screws to position the microporous transparent film.

[0037] In combination Figure 1 and Figure 3 As can be seen, the lower frame 31 of the resin tank 3 is detachably fixed to the resin tank support plate 6 by screws at both ends.

[0038] The resin tank support plate 6 of the embodiment is made of a nylon plate engraved by a laser engraving machine. The resin tank support plate has a light transmission hole with a corresponding shape and size at a position corresponding to the microporous transparent film.

[0039] The microporous transparent film of the embodiment is a PTFE mold purchased on the market, which is uniformly drilled on a numerical control engraving machine by a tool. For example, a 0.05mm tool is used to obtain a 0.05mm microporous transparent film.

[0040] In combination Figure 1 and Figure 3 As can be seen, the Z-axis motion module 1 is a lead screw sliding table controlled by a 57-step motor 11. Guide rods 13 are arranged at both sides of the lead screw 12. When the sliding table 14 moves on the lead screw, the guide rods guide the movement of the sliding table 14, so that the movement of the sliding table 14 is more stable. Figure 3 The output shaft of the 57-step motor 11 and the lead screw connected thereto are not shown in the figure.

[0041] From Figure 1 and Figure 3 As can be seen, the motion forming platform 2 includes a forming platform 21 and a connecting head 22. The forming platform of the embodiment is made of 6061 aluminum alloy. The lower end of the connecting head 22 is connected to the upper side of the forming platform 21, and the upper end of the connecting head is detachably connected to the sliding table 14 of the lead screw sliding table. The connecting head and the sliding table of the embodiment are designed by using the technology of 3D printing.

[0042] FromFigure 1 and Figure 3 As can be seen, the Z-axis motion module 1 is connected to the side of the frame 5 corresponding to the resin tank 3. Note that the center point of the molding platform 21 coincides with the center point of the resin tank 3.

[0043] This invention requires connection to a computer for use.

[0044] Before printing, some preparation work needs to be done. The specific steps are as follows:

[0045] First, connect the light source 7 and the Z-axis motion module 1 to the AC power supply, and then connect the HDMI cable from the light source 7 and the USB cable from the control module of the Z-axis motion module 1 to the computer.

[0046] Turn on the light source 7 and adjust the angle of the reflector 4 so that the image of the light source 7 is clearly visible at the bottom of the resin tank 3;

[0047] Add photosensitive resin to resin tank 3, adjust the position of motion molding platform 2 so that the lower surface of molding platform contacts the surface of photosensitive resin in resin tank 3, and then reset the position of molding platform to zero.

[0048] Using slicing software on a computer, set parameters such as resin layer thickness, exposure time, and lifting speed of the motion molding platform to slice the three-dimensional model of the object being molded.

[0049] Once the preparations are complete, you can start printing. The entire printing process is automated by the computer until printing is finished.

[0050] The microporous transparent membrane of this embodiment is low in cost, but experimental verification has shown that it can completely replace the AF2400 oxygen ion exchange membrane.

[0051] After printing, since both the resin tank 3 and the molding platform are detachable, they can be disassembled and cleaned.

Claims

1. A rapid photopolymerization DLP 3D printing device, comprising a frame and a light source, a reflector, a resin tank support plate, a resin tank, and a Z-axis motion module mounted on the frame, wherein the light source and the reflector are located at the bottom of the frame, the resin tank is fixed on the resin tank support plate directly above the reflector, the bottom of the resin tank has a transparent film, and a motion forming platform is connected to the Z-axis motion module, characterized in that: The transparent film is an air-permeable microporous transparent film with a pore size of 0.05 mm. The center point of the lower surface of the motion molding platform coincides with the center point of the resin tank.

2. The rapid photopolymerization DLP 3D printing equipment as described in claim 1, characterized in that: The transparent film is a microporous glass or a microporous plastic film.

3. The rapid photopolymerization DLP 3D printing equipment as described in claim 2, characterized in that: The resin tank includes an upper frame, a lower frame, and the transparent film. The transparent film is located between the upper frame and the lower frame, and the upper frame and the lower frame can be detachably fastened to position the transparent film.

4. The rapid photopolymerization DLP 3D printing equipment as described in claim 1, characterized in that: The Z-axis motion module is a lead screw slide controlled by a stepper motor, which is connected to one side of the resin tank at the upper end of the frame.

5. The rapid photopolymerization DLP 3D printing equipment as described in claim 4, characterized in that: The motion molding platform includes a molding platform and a connector connected to its upper side. The molding platform is arranged parallel to the resin tank, and the connector is detachably connected to the slide of the lead screw slide.

6. The rapid photopolymerization DLP 3D printing equipment as described in claim 5, characterized in that: The forming platform is made of aluminum alloy plate.

7. The rapid photopolymerization DLP 3D printing equipment as described in claim 1, characterized in that: The light source is the light source provided by the ultra-high pressure mercury lamp projector.

8. The rapid photopolymerization DLP 3D printing equipment as described in claim 1, characterized in that: The reflector is an aluminum-coated mirror obtained using vapor deposition technology.

9. The rapid photopolymerization DLP 3D printing equipment as described in claim 1, characterized in that: The resin tank support plate is made of nylon plate and is engraved by a laser engraving machine. It has light-transmitting holes corresponding to the transparent film.

10. The rapid photopolymerization DLP 3D printing equipment as described in claim 1, characterized in that: The frame is a frame structure assembled from aluminum profiles.

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