CN215151851U - Continuous photocuring molding additive manufacturing device in liquid - Google Patents

Abstract

The utility model provides a device for continuous photocuring molding additive manufacturing in liquid, wherein a molding platform is provided with a motor driving device to realize up-and-down movement; the molding platform is positioned above the resin tank, and the bottom of the resin tank is a light-transmitting bottom plate; a liquid printing material is arranged in the resin tank; the light splitting device is arranged on a light path of the light source, and a plurality of light paths of the light splitting device are respectively provided with a first polarization device and a second polarization device; the light paths of the first light polarization device and the second light polarization device are both shot into the resin tank above the light-transmitting bottom plate to form an intersection point, and the track of the intersection point forms the intersection point at a certain position in a certain space range in the liquid printing material by changing the light paths; a gap is reserved from the intersection point to the light-transmitting bottom plate. And solidifying the liquid printing material at the position where the intersection point passes by controlling the intersection point to move along the designated track and controlling a light source switch, and attaching the solidified liquid printing material to the forming platform. The utility model has the characteristics of control is simple, and the shaping is fast, and the precision is high, and the shaping breadth is big.

Description

Continuous photocuring molding additive manufacturing device in liquid

Technical Field

The utility model relates to a 3D prints technical field, especially relates to a continuous light curing shaping vibration material disk manufacturing device in liquid.

Background

3D printing (3DP), one of the rapid prototyping technologies, is a technology that constructs an object by printing layer by layer using an adhesive material such as powdered metal or plastic based on a digital model file.

Focusing laser with specific wavelength and intensity on the surface of a light-cured material to enable the light-cured material to be solidified from point to line and from line to plane sequentially to finish the drawing operation of one layer, then moving an elevating platform in the vertical direction by the height of one layer, and then curing another layer.

The SLA three-dimensional printing technology can be divided into top layer scan forming and bottom layer scan forming. In the top layer scanning molding, laser scans the surface of a liquid resin material from top to bottom, a newly molded resin layer is positioned at the top of a molded part, and a new cured layer is continuously accumulated on the top of the newly molded resin layer, so that the molding of a three-dimensional solid is realized. After each laser scan to form a new solid thin layer, the forming table carrying the formed part is lowered by one layer thickness so that the formed part is one layer thickness below the resin level, which will affect the accuracy of the entity because the level is difficult to level quickly after each layer is cured due to the high viscosity of the photosensitive resin material. Therefore, after scraping and cutting by the scraper, the required amount of resin can be coated on the upper laminated layer very uniformly, so that better precision can be obtained after laser curing, and the surface of the product is smoother and smoother. This process interrupts the laser scanning process and takes a relatively long time, resulting in a severe decrease in the speed of three-dimensional printing of SLA. In addition, in the top scanning molding, the molded part is always soaked in the liquid resin, when a higher object needs to be molded, a resin tank exceeding the height of the object is needed for molding, a large amount of resin needs to be filled into the resin tank, and the residual resin is recycled after printing is finished, so that the cost is high and the operation is complex.

In the bottom layer scanning forming technology, the bottom of the resin groove uses a light-transmitting bottom plate, laser passes through the light-transmitting plate at the bottom of the resin groove from bottom to top, and resin on the light-transmitting plate forms a fixed thin-layer solid pattern. And then the tray is lifted one layer thick, and the laser scans the bottom again to form a new solidified layer, so that the three-dimensional solid is finally formed by layer-by-layer accumulation. The advantage of this method is that the formed solid layer does not need to be completely immersed in the resin bath, only part of the solid layer at the bottom needs to be immersed in a shallower resin bath, and therefore less resin is needed in the resin bath. On the other hand, however, since a new solid layer is formed on the resin surface at the bottom of the resin tank, the new solid layer will adhere to the transparent bottom plate while being combined with the original solid layer, and in order to separate the new solid layer from the transparent bottom plate, it is necessary to raise the lifting table tray carrying the molded part by a predetermined height to completely separate the molded part from the transparent bottom plate, and let the resin solution fill the bottom of the resin tank, and then let the tray descend to keep a layer thickness distance between the newly molded solid layer and the transparent bottom plate, and then continue the next layer of scan molding. The raising and lowering of the lift table interrupts the process of scanning photocuring and takes a relatively long time in the formation of each layer, so that the entire printing speed is greatly reduced.

CN105122136A proposes a continuous photo-curing method using a semi-permeable element such that a polymerization inhibitor is introduced at the bottom of the resin tank, which polymerization inhibitor prevents the curing of the resin in the bottom zone, forming a polymerization-inhibited zone. The light-induced polymerization reaction intelligently occurs in the region outside the polymerization inhibition region, the photosensitive resin in the polymerization inhibition region is always kept in a liquid state, and when the tray loaded with the formed solid rises by one layer thickness, the peripheral resin is driven by the ambient pressure to rapidly flow into the gap between the newly formed solid layer and the light-transmitting bottom plate, so that the next layer can be rapidly cured. The semi-permeable element of the method is limited by molecular permeability, optical transmission performance, mechanical strength and the like, and a material with excellent indexes is difficult to find as the semi-permeable element.

CN105922587A also proposes a continuous light curing device method, which requires at least two light sources with different wavelengths and adjustable power. The resin in the resin tank contains a photoinitiator and a polymerization inhibitor. A light-emitting inhibiting unit is added in a light source system, polymerization is inhibited at the interface of a light-transmitting bottom plate and a liquid printing material by selectively exciting a light inhibitor in photosensitive resin, and a polymerization inhibition area is formed, so that continuous photocuring is realized. The method needs to control a plurality of light sources, and the system is complex.

Both CN105122136A and CN105922587A adopt dlp (digital light processing) technology, and have the characteristics of high molding precision but small molding area. Meanwhile, most of the core component array imaging equipment is one of a digital micromirror device DMD, a liquid crystal on silicon LCOS, a high-temperature polysilicon HTPS and the like, the DMD is expensive at present, and the LCOS and the HTPS can be damaged after a long time of use under the irradiation of a light source.

SUMMERY OF THE UTILITY MODEL

The utility model provides a not enough to the device that provides at present, the utility model provides a device that continuous photocuring three-dimensional printing can be realized to method. The utility model discloses an innovation point:

1. no polymerization inhibitor is required: the principle of the device is that intersection points are generated inside the liquid printing material through laser multiple beams, and energy is released at the intersection points due to interference of light at the intersection points, so that the liquid printing material absorbs energy and is cured rapidly. The intersection point of the laser beams is in the liquid resin and does not adhere to the container.

2. The use of semi-permeable elements is not required: the present device principle does not require the permeation of the polymerization inhibitor into the bottom of the resin tank through a semi-permeable element.

3. There is no need to use multiple light sources: since the present apparatus does not require the polymerization inhibitor mentioned in CN105122136A and CN105922587A, a light source required for exciting the polymerization inhibitor is also not required.

4. The three-dimensional printing breadth is increased, and the precision is improved. At present, in a 3D printing device based on photocuring, the mode based on galvanometer type laser scanning has the highest precision and the largest forming breadth. Preferably, the device uses a digital galvanometer as the polarizing device.

The utility model discloses a realize through following technical scheme:

a liquid in-vivo continuous photocuring molding additive manufacturing device comprises a molding platform, a resin tank, a light source, a light splitting device, a first polarization device and a second polarization device;

a human-computer interaction device and a control system; a detection device;

the forming platform, the resin tank, the light source, the light splitting device, the first polarizing device and the second polarizing device are all arranged on the frame, and the forming platform is provided with a motor driving device to realize up-and-down movement; the molding platform is positioned above the resin tank, and the bottom of the resin tank is a light-transmitting bottom plate; a liquid printing material is arranged in the resin tank;

the light splitting device is arranged on a light path of the light source, and a plurality of light paths of the light splitting device are respectively provided with a first polarization device and a second polarization device; the light paths of the first light polarization device and the second light polarization device are both shot into the resin tank above the light-transmitting bottom plate to form an intersection point, and the track of the intersection point forms the intersection point at a certain position in a certain space range in the liquid printing material by changing the light paths; a gap is reserved from the intersection point to the light-transmitting bottom plate;

the detection device feeds back information of the liquid printing material in the resin tank and information of the forming platform to the control system in real time;

the human-computer interaction device is used for three-dimensional model processing, parameter setting, model processing operation and device state display;

the control system controls the lifting of the forming platform, the switching and the power of the light source, and the light path directions of the first polarization device and the second polarization device.

The movement of the shaping table is preferably driven by a stepping motor, a servomotor or a linear motor for the upward and downward movement of the drive in the Z axis.

Preferably, the liquid printing material is a photosensitive resin that can be passed through by a single beam of light with no or only minimal curing.

Preferably, the liquid printing material is capable of absorbing energy released by laser interference to cure.

Preferably, the light-transmitting bottom plate is of a light-transmitting rigid flat plate structure, the length is 1-10000mm, the width is 1-10000mm, and the thickness is 0.001-100 mm.

Preferably, the light-transmissive substrate has a transmittance of more than 30% for wavelengths in the emission spectral range of the light source.

Preferably, the first polarization device and the second polarization device include, but are not limited to, a polarization device, a light-gathering device, etc. so that the beam intersection point is more accurate, the size accuracy of the intersection point is higher, and the interference effect of light is better.

Preferably, the control system controls the amount of liquid resin in the resin tank through a liquid level sensor and an electromagnetic valve.

The additive manufacturing method by utilizing the device to perform solidification molding comprises the following steps: the light path of the light source is divided into multiple paths of light beams through the light polarizing device, the multiple paths of light beams are controlled by the first light polarizing device and the second light polarizing device to form an intersection at a certain point at a distance xi above the light-transmitting bottom plate in the liquid printing material, the distance xi is between 0.001mm and 100mm, the intersection is controlled to move along a specified track from the light-transmitting bottom plate xi and control a light source switch, the liquid printing material at the position where the intersection passes is selected to be solidified to form a new solidified layer, and because a gap of xi exists between the new solidified layer and the light-transmitting bottom plate, the gap is filled with resin, the new solidified layer is not attached to the light-transmitting bottom plate; the forming platform is located above the light-transmitting bottom plate and can move up and down along the z direction of the light-transmitting bottom plate, and the cured and formed three-dimensional component is located between the forming platform and the light-transmitting bottom plate and attached to the forming platform.

Specifically, the method comprises the following main steps:

(1) the starting device is used for adding the liquid printing material into the resin tank, and the detection device is used for controlling the feeding system to keep the liquid level height of the liquid printing material in the resin tank;

(2) transmitting the matched process parameters of the three-dimensional model data and the liquid printing material to the control system through a detection device;

(3) the control system controls the forming platform to descend to an initial position at a distance xi from the light-transmitting bottom plate;

(4) the light emitted by the light source is divided into multiple paths of light beams by the light splitting device, then the light path is accurately changed to a specified direction by the first light polarizing device and the second light polarizing device, so that the multiple paths of light beams form an intersection at a certain point on a horizontal plane at a distance xi above the light-transmitting bottom plate, the control system adjusts the power of the light source, a switch and the deflection of the light path according to process parameters and three-dimensional model data, the intersection forms an intersection movement track on the plane, and the liquid printing material is solidified at the position where the light source is opened on the intersection track due to the interference of light, so that a solidified layer is formed;

(5) the control system controls the forming platform to move upwards for a layer thickness distance, and the layer thickness distance is usually 0.001mm-1 mm;

(6) and (5) repeating the processes of the step (4) and the step (5), and finally forming a three-dimensional solid with a desired shape on the forming platform.

The utility model overcomes prior art's is not enough, has control simply, and the shaping is fast, and the precision is high, the big characteristics of shaping breadth.

Drawings

FIG. 1 is a schematic diagram of the structure of the device of the present invention;

fig. 2 is a schematic diagram of the control system of the present invention.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and embodiments, but the present invention is not limited to the embodiments.

As shown in fig. 1, an in-liquid continuous photocuring molding additive manufacturing device is characterized by comprising a molding platform 101, a resin tank 103, a light source 108, a light splitting device 106, a first polarization device 107 and a second polarization device 109; the system also comprises a human-computer interaction device and a control system; a detection device;

the forming platform 101, the resin tank 103, the light source 108, the light splitting device 106, the first polarization device 107 and the second polarization device 109 are all arranged on the frame 110, and the forming platform 101 is provided with a motor driving device to realize up-and-down movement; the molding platform 101 is positioned above the resin tank 103, and the bottom of the resin tank 103 is a light-transmitting bottom plate 105; a liquid printing material 104 is arranged in the resin tank 103;

the light splitting device 106 is arranged on the light path of the light source 108, and a first polarization device 107 and a second polarization device 109 are respectively arranged on a plurality of light paths of the light splitting device 106; the light paths of the first light deflecting device 107 and the second light deflecting device 109 are both emitted into the resin tank 103 above the light-transmitting bottom plate 105 to form an intersection point 112, and the track of the intersection point forms the intersection point 112 at a certain position in a certain space range inside the liquid printing material 104 by changing the light paths; a gap 111 is reserved from the intersection point 112 to the light-transmitting bottom plate 105;

the detection device comprises a temperature detector, a liquid level detector and a forming platform position detector;

feeding back information of the liquid printing material 104 in the resin tank 103 and information of the molding platform 101 to the control system in real time;

the human-computer interaction device is used for three-dimensional model processing, parameter setting, model processing operation and device state display;

as shown in fig. 2, the control system includes: the system comprises a three-dimensional model management system, a light path control system, a forming platform control system, a detection system, a human-computer interaction system and a polarization device control system. The control system controls the lifting of the forming platform 101, the switching and power of the light source 108, and the light path directions of the first light deflecting device 107 and the second light deflecting device 109.

The liquid printing material 104 can be passed through by a single beam of light without or with minimal curing, and can absorb energy released by laser interference to cure.

The light-transmitting bottom plate 105 is of a light-transmitting rigid flat plate structure, the length is 1-10000mm, the width is 1-10000mm, and the thickness is 0.001-100 mm.

The light-transmissive backplane 105 has a transmittance of more than 30% for wavelengths in the spectral range of the light emitted by the light source 108.

The additive manufacturing method adopting the device for solidification molding comprises the following steps:

the light emitted by the light source 108 is divided into multiple paths of light beams by the light polarizing device 106, the multiple paths of light beams are controlled by the first light polarizing device 107 and the second light polarizing device 109 to form an intersection point 112 at a certain point at a distance xi above the light-transmitting bottom plate 105 in the liquid printing material 104, the distance xi is between 0.001mm and 100mm, the intersection point is controlled to move along a specified track on the distance xi from the light-transmitting bottom plate 105 xi and the light source 108 is controlled to be switched on and off, the liquid printing material 104 at the position where the intersection point passes is selected to be solidified, and a new solidified layer 102 is formed;

the cured three-dimensional member is located between the molding platform 101 and the light-transmitting substrate 105, and is attached to the molding platform 101.

The method specifically comprises the following steps:

(1) starting the device, adding the liquid printing material 104 into the resin tank 103, and controlling a feeding system to maintain the liquid level of the liquid printing material 104 in the resin tank 103 by a detection device;

(2) transmitting the matched process parameters of the three-dimensional model data and the liquid printing material 104 to the control system through a detection device;

(3) the control system controls the forming platform 101 to descend to an initial position at a distance xi from the light-transmitting bottom plate 105;

(4) the light emitted by the light source 108 is divided into multiple paths of light beams by the light splitting device 106, then the light path is accurately changed to a specified direction by the first light polarizing device 107 and the second light polarizing device 109, so that the multiple paths of light beams form an intersection point 112 at a certain point on a horizontal plane at a distance xi above the light-transmitting bottom plate 105, the control system adjusts the power, the switch and the deflection of the light path of the light source 108 according to process parameters and three-dimensional model data, so that the intersection point 112 forms a track of intersection point movement on the plane, and the liquid printing material 104 is solidified at the position where the light source 108 is opened on the track of the intersection point 112 due to the interference phenomenon of light, so that the solidified layer 102 is formed;

(5) the control system controls the forming platform 101 to move upwards for a layer thickness distance, and the layer thickness distance is 0.001mm-1 mm;

(6) and (5) repeating the processes of the step (4) and the step (5), and finally forming a three-dimensional solid with a desired shape on the forming platform 101.

Claims (4)

1. The in-liquid continuous photocuring molding additive manufacturing device is characterized by comprising a molding platform (101), a resin tank (103), a light source (108), a light splitting device (106), a first polarization device (107) and a second polarization device (109); the system also comprises a human-computer interaction device and a control system; a detection device;

the forming platform (101), the resin tank (103), the light source (108), the light splitting device (106), the first polarizing device (107) and the second polarizing device (109) are all arranged on the rack (110), and the forming platform (101) is provided with a motor driving device to move up and down; the molding platform (101) is positioned above the resin tank (103), and the bottom of the resin tank (103) is a light-transmitting bottom plate (105); a liquid printing material (104) is arranged in the resin tank (103);

the light splitting device (106) is arranged on an optical path of the light source (108), and a plurality of optical paths of the light splitting device (106) are respectively provided with a first polarization device (107) and a second polarization device (109); the light paths of the first light polarization device (107) and the second light polarization device (109) are both emitted into the resin tank (103) above the light-transmitting bottom plate (105) to form an intersection point (112), and the track of the intersection point forms the intersection point (112) at a certain position in a certain space range in the liquid printing material (104) by changing the light paths; a gap (111) is reserved from the intersection point (112) to the light-transmitting bottom plate (105);

the detection device feeds back information of the liquid printing material (104) in the resin tank (103) and information of the molding platform (101) to the control system in real time;

the human-computer interaction device is used for three-dimensional model processing, parameter setting, model processing operation and device state display;

the control system controls the forming platform (101) to ascend and descend, the light source (108) is switched on and off, and the light path directions of the first light polarization device (107) and the second light polarization device (109) are adjusted.

2. The in-liquid continuous stereolithography additive manufacturing apparatus of claim 1, wherein said liquid printing material (104) is capable of being cured by absorption of energy released by laser interference through the passage of a single beam of light with no or minimal curing.

3. The in-liquid continuous photocuring profiling additive manufacturing apparatus according to claim 1, wherein the light-transmissive base plate (105) is a light-transmissive rigid flat plate structure with a length of 1-10000mm, a width of 1-10000mm and a thickness of 0.001-100 mm.

4. An in-liquid continuous stereolithographic additive manufacturing apparatus according to claim 1, characterized in that a light-transmissive backplane (105) has a transmittance of more than 30% for wavelengths in the spectral range of the light source (108) emission.

Images