Photocuring 3D printing equipment

Abstract

The utility model discloses a photocuring 3D printing device, which comprises a projection lens device installed on a sliding mechanism and a trough module installed on the lower side of the projection lens device, the projection lens device comprises a light source, a DMD chip and an optical lens, and after the projection lens device is installed on the sliding mechanism, the DMD chip is provided with an inclined scanning angle. The forming platform is driven by the lifting mechanism to move in the z direction; according to the photocuring 3D printing equipment, the projection positions of the projection lens device in the x direction and the y direction are adjusted by controlling the projection lens device to slide on the two sets of sliding rails which are perpendicular to each other, and therefore dynamic projection of the projection lens device is achieved, the 3D printing equipment can meet the requirement for large-size machining, and the machining efficiency of the 3D printing equipment is improved. Besides, the DMD chip in the 3D printing equipment is provided with an inclined scanning angle, so that the projection pattern precision of the DMD chip is improved, and the 3D printing equipment can realize high-precision printing while printing oversized objects.

Description

TECHNICAL FIELD

[0001] The utility model relates to 3D printing field especially relates to a light solidification 3D printing equipment. BACKGROUND

[0002] 3D printing is one kind of rapid prototyping technology, also called additive manufacturing, it is a kind of technology based on digital model file, using powdered metal or plastic and other materials that can be bonded, by layering printing way to construct object. One main branch of 3D printing technology is light solidification 3D printing technology, it is the principle of using light beam to irradiate liquid photosensitive resin and make it solidify, make material point or layer accumulation forming. Light solidification 3D printing technology is mainly divided into SLA, LCD and DLP projection technology.

[0003] SLA is called stereolithography technology, it is to use laser beam to scan and irradiate on photosensitive resin point by point and make it solidification forming. SLA technology has the problems of low efficiency and low precision.

[0004] LCD and DLP projection technology is to project the whole layer image through projection lens to photosensitive resin, and layer by layer superposition forming, its characteristics is that can complete whole layer printing at one time, has the characteristics of printing speed, high precision. LCD projection technology is to use LCD as image generator, because the core component LCD service life is very short, lack of stability, and is limited by LCD screen size, cannot do super large size 3D printing, therefore is not suitable for industrial mass production.

[0005] The core of DLP (Digital light processing) technology is DMD chip (Digital Micromirror Device). Based on the 3D printing of DMD scanning has the advantages of high material utilization rate, forming speed etc. However, the existing light solidification 3D forming equipment based on DMD is based on static image projection, limited by DMD chip, to realize large size forming, need to expand the projection spot area, so the forming precision will be seriously affected, therefore high precision and large size are incompatible. UTILITY MODEL CONTENT

[0006] To solve the above problems, the utility model provides a kind of light solidification 3D printing equipment, the dynamic projection of projection lens device makes 3D printing equipment can satisfy large size processing, improves the processing efficiency of 3D printing equipment.

[0007] To realize the utility model purpose, the utility model provides a kind of light solidification 3D printing equipment, including:

[0008] base station;

[0009] The sliding mechanism has two groups of slide rails arranged perpendicularly to each other, and is used for adjusting the position of the projection pattern;

[0010] The projection lens device is slidably connected to the sliding mechanism, and comprises a light source, a DMD chip and an optical lens, and is used for generating the projection pattern.

[0011] The trough module is located at the lower side of the projection lens device, and comprises a resin trough for containing liquid photosensitive resin and a molding platform for carrying a molded part.

[0012] The lifting mechanism is connected to the molding platform, and is used for adjusting the height of the molding platform in the vertical direction.

[0013] The controller is used for linkage control of the sliding mechanism, the projection lens device and the lifting mechanism.

[0014] The projection lens device comprises a light source, a DMD chip and an optical lens, the projection lens device is mounted on a group of slide rails, and the DMD chip and the slide rails form an inclined scanning angle.

[0015] Further, the sliding mechanism comprises a first slide rail and a second slide rail, the first slide rail and the second slide rail are perpendicular to each other, and are respectively used for adjusting the stepping direction and the scanning direction of the projection lens device.

[0016] Further, the second slide rail comprises a first scanning slide rail and a second scanning slide rail arranged oppositely along the x direction, the first slide rail is slidably connected to the first scanning slide rail and the second scanning slide rail at two ends respectively, and the projection lens device is slidably connected to the first slide rail.

[0017] The sliding mechanism comprises a first driving motor and a second driving motor, the first driving motor drives the projection lens device to slide along the first slide rail, and the second driving motor drives the first slide rail to slide along the second slide rail.

[0018] Further, the width of the first scanning slide rail is greater than the width of the second scanning slide rail, and the second driving motor drives the side of the first slide rail connected with the first scanning slide rail.

[0019] Further, the lifting mechanism comprises a lifting driving motor, a lead screw connected to the output end of the lifting driving motor, and a screw block matched with the lead screw, and the molding platform is fixedly connected to the screw block.

[0020] Further, the lifting mechanism further comprises a support plate connected to the screw block and a support frame connected to the support plate, and the molding platform is fixed to the side of the support frame close to the resin trough.

[0021] Further, the lifting mechanism further comprises a pair of guide rails on both sides of the lead screw, and both sides of the support plate are slidably connected to the guide rails.

[0022] Further, the trough module comprises a liquid level sensor, and the liquid level sensor is electrically connected to the controller.

[0023] Further, the trough module is provided with a coating assembly, and the coating assembly is electrically connected to the controller.

[0024] Further, the projection lens device further comprises a DMD driving module for controlling the projection imaging of the DMD chip, and the DMD driving module is electrically connected to the controller.

[0025] In the light-curing 3D printing equipment, the projection lens device is controlled to slide on the two groups of sliding rails arranged perpendicularly to each other, the projection position of the projection lens device in the x direction and the y direction is adjusted, the dynamic projection of the projection lens device is realized, the 3D printing equipment can meet large-size processing, and the processing efficiency of the 3D printing equipment is improved. In addition, the DMD chip in the 3D printing equipment is provided with an inclined scanning angle, the projection pattern precision of the DMD chip is improved, the 3D printing equipment can meet super-large-size object printing, and high-precision printing is realized. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 Fig. 1 is a structural schematic view of a light-curing 3D printing equipment in one embodiment of the present application;

[0027] Figure 2 Fig. 2 is a structural schematic view of a light-curing 3D printing equipment in another embodiment of the present application;

[0028] Figure 3 Fig. 3 is a structural schematic view of a lifting mechanism in the present application;

[0029] Figure 4 Fig. 4 is a projection pattern schematic view of a DMD chip without setting an inclined scanning angle;

[0030] Figure 5 Fig. 5 is a projection pattern schematic view of a DMD chip with setting an inclined scanning angle;

[0031] Figure 6 Fig. 6 is an imaging schematic view of a DMD chip on a forming surface in the present application. DETAILED DESCRIPTION

[0032] For the convenience of understanding the utility model, the utility model will be described more comprehensively in combination with specific embodiments below. The preferred embodiments of the utility model are given in the specific embodiments. However, the utility model can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive.

[0033] The words "optionally" and the like in the utility model refer to the utility model embodiments that can provide certain beneficial effects in some cases. However, other embodiments can also be optional in the same or other cases. In addition, the description of one or more optional embodiments does not imply that other embodiments are not available, nor is it intended to exclude other embodiments from the scope of the utility model.

[0034] Referring to Figures 1 to 3 As shown in the figure, the utility model provides a kind of photocuring 3D printing equipment, and 3D printing equipment includes base 1, specifically, base 1 can be marble platform. Base 1 is equipped with sliding mechanism 2, and sliding mechanism 2 has two groups of slide rails arranged perpendicularly to each other, for adjusting projection pattern position.

[0035] 3D printing equipment also includes projection lens device 3 slidably connected to sliding mechanism 2 and material tank module 4 located at the lower side of projection lens device 3, and material tank module 4 includes resin tank 41 containing liquid photosensitive resin and forming platform 42 carrying forming piece. Liquid photosensitive resin can select photosensitive resin commonly used in 3D printing field, such as epoxy resin class, acrylate class etc. The material quality of liquid photosensitive resin is selected according to the actual printed article. The size of resin tank 41 should comprehensively consider the amount of photosensitive resin to be contained, the size of forming piece and the projection position of projection lens device 3.

[0036] In 3D printing process, forming platform 42 is immersed in photosensitive resin carried by resin tank 41, and forming surface is formed on the surface of forming platform 42 or the surface of forming piece carried by forming platform 42. Projection lens device 3 projects the image of each layer slice to forming surface, and the corresponding layer photosensitive resin of forming surface is photocured forming.

[0037] 3D printing equipment also includes lifting mechanism 5 for driving forming platform 42 to reciprocate or move at uniform speed along vertical direction, and vertical direction can refer to Figure 1The accumulation of each layer of the molding image is achieved by adjusting the height of the molding platform 42 in the z direction to obtain the molding piece. In one embodiment of the present application, the position of the imaging surface is unchanged, and after the photosensitive resin corresponding to the molding surface is cured, the lifting mechanism 5 drives the molding platform 42 to move downward, so that the 3D printing device forms the molding piece from bottom to top. In other embodiments, the lifting mechanism 5 can first drive the molding platform 42 to move upward and then downward to ensure the position accuracy of the imaging surface during each printing.

[0038] The 3D printing device of the present application further comprises a controller, which is electrically connected with the sliding mechanism 2, the projection lens device 3 and the lifting mechanism 5, and is used for linkage control of the sliding mechanism 2, the projection lens device 3 and the lifting mechanism 5, so that the pattern generated by the projection lens device 3, the position of the projection lens device 3 and the height of the molding platform 42 are matched, the photosensitive resin is printed and cured layer by layer, and the 3D molding piece is obtained.

[0039] In one embodiment, the sliding mechanism comprises a first sliding rail 21 extending in the x direction and a second sliding rail 22 extending in the y direction, and the x direction and the y direction are specifically shown in the drawings. Figure 1 The first sliding rail 21 and the second sliding rail 22 are perpendicular to each other and are respectively used for adjusting the stepping direction and the scanning direction of the projection lens device 3. The projection lens device 3 can slide on the first sliding rail 21 and the second sliding rail 22 to adjust the projection position of the projection lens device 3 in the x direction and the y direction, and realize dynamic projection of the projection lens device 3.

[0040] In one embodiment, as shown in the drawings, Figure 1 The base 1 is provided with four supporting columns, the second sliding rail 22 is fixed on the upper side of the four supporting columns, and the four supporting columns form an accommodating space. The resin tank 41 is fixed on the base 1 and located in the accommodating space.

[0041] In another embodiment, as shown in the drawings, Figure 2 The base 1 is provided with four supporting columns, the second sliding rail 22 is fixed on the upper side of the four supporting columns, and the four supporting columns form an accommodating space. The resin tank 41 is provided in the accommodating space and abuts against the four supporting columns, and the four supporting columns are used as installation limiting reference to facilitate positioning during installation of the resin tank 41, and the overall structure of the 3D printing device is more compact.

[0042] In the utility model, the projection lens device 3 includes light source, DMD chip 31 and optical lens, specifically, the light source can select semiconductor laser light source or ultraviolet LED light source, the light of light source irradiates on DMD chip 31, and the projection pattern of DMD chip 31 is imaged on the forming surface after optical lens.Specifically, DMD chip 31 is composed of many small aluminum reflecting mirror (micro-mirror for short), and the opening and closing state of micro-mirror is controlled by controlling the rotation of micro-mirror around fixed yoke, so as to control the projection pattern of DMD chip 31.The projection pattern of DMD chip 31 is imaged on the corresponding position of the forming surface by optical lens.The projection lens device of the 3D printing equipment of the utility model adopts the inclined scanning technology.After the projection lens device 3 in the utility model is installed on the first slide rail 21, the DMD chip 31 and the first slide rail 21 form an inclined scanning angle θ, the imaging precision of the projection lens device 3 is improved, and the 3D printing equipment of the utility model has higher forming precision.

[0043] Specifically, referring to Figure 4 and 5 , Figure 4 it is the projection pattern schematic diagram of DMD chip 31 without setting the inclined scanning angle, Figure 5 it is the projection pattern schematic diagram of DMD chip setting the inclined scanning angle, and one small square in the drawing represents one micro-mirror, one micro-mirror represents one pixel, and DMD chip 31 is composed of many micro-mirrors.In order to clearly show the relationship between the number of micro-mirror opening and the width of projection pattern, different colors are used to show, and the micro-mirror filled with color represents the micro-mirror in the opening state, and the white micro-mirror represents the micro-mirror in the closed state.And the color of micro-mirror and corresponding projection pattern 32 is consistent.From Figure 4 it can be seen that, in the case that DMD chip 31 is not set with the inclined scanning angle, the micro-mirror in the width direction is increased by one every time, that is, DMD chip is increased by one pixel, and the width of projection pattern 32 is increased by one every time, and the gradual transition between the projection pattern width of one DMD micro-mirror and the projection pattern width of two DMD micro-mirrors cannot be realized. Figure 5As can be seen, in the case that the DMD chip 31 is provided with the inclined scanning angle θ, the width of the projection pattern 32 is gradually transitioned with each increase of the opened DMD micromirror, that is, with each increase of the pixel of the DMD chip, so that the projection lens device provided with the inclined scanning angle of the DMD chip 31 has higher projection pattern precision, and the 3D printing equipment of the utility model has higher forming precision. The 3D printing equipment of the utility model adjusts the projection position of the projection lens device 3 in the x direction and the y direction by controlling the sliding of the projection lens device 3 on the first sliding rail 21 and the second sliding rail 22, realizes dynamic projection of the projection lens device 3, and makes the 3D printing equipment capable of meeting large-size processing and improving the processing efficiency of the 3D printing equipment. In addition, the DMD chip 31 in the 3D printing equipment of the utility model is provided with the inclined scanning angle, the projection pattern precision of the DMD chip 31 is improved, and the 3D printing equipment realizes high-precision printing while meeting the printing of oversized objects.

[0044] Further, the DMD chip 31 has the inclined scanning angle θ, the subdivision number m of the DMD chip and the optical lens magnification n can be freely matched according to the required precision and scanning size, so that the precision can also be met while the efficiency is ensured. Specifically, the following formula (1) and formula (2) can be used for calculation:

[0045] pw = m * p * sin θ (1)

[0046] θ=arctan(1 / m) (2)

[0047] In formula (1) and formula (2), pw is the forming precision, m is the subdivision number of the DMD chip, p is the size of one pixel of the DMD chip, that is, the size of each micromirror, and θ is the inclined scanning angle of the DMD chip.

[0048] Referring to Figure 6 The imaging diagram of the pattern generated by the DMD chip 21 on the forming surface through the optical lens is shown in the figure, wherein the DMD chip 21 is provided with the inclined scanning angle θ, and the size of the imaging pattern 33 of the forming surface is calculated according to the following formula (3) and formula (4):

[0049] w = n * p * N * cos θ (3)

[0050] h = n * p * M * cos θ (4)

[0051] In the formula (3) and the formula (4), w is the width of the imaging pattern 33, h is the length of the imaging pattern 33, the imaging pattern 33 refers to a pattern formed at the forming surface after the projection pattern of the DMD chip 31 is magnified by the optical lens magnification, n is the optical lens magnification, p is a pixel size of the DMD chip, N is the number of long-side pixels of the DMD, M is the number of short-side pixels of the DMD, and θ is the inclined scanning angle of the DMD chip.

[0052] Further, the projection lens device 3 further comprises a DMD driving module for controlling the projection imaging of the DMD chip 31, the DMD driving module is electrically connected with the controller, and the projection pattern of the DMD chip 31 is matched with the position of the projection lens device 3 on the sliding mechanism 2 and the height of the forming platform 42 through the DMD driving module, so that the light-sensitive resin is obtained by layer-by-layer printing and curing to realize the forming piece.

[0053] In an embodiment of the present application, the second slide rail 22 comprises a first scanning slide rail 221 and a second scanning slide rail 222 which are oppositely arranged along the x direction, specifically, the first scanning slide rail 221 and the second scanning slide rail 222 both extend along the y direction, and the x direction is perpendicular to the y direction. In the embodiment, the y direction is the scanning direction of the projection lens device 3, and the x direction is the stepping direction of the projection lens device 3. The two ends of the first slide rail 21 are respectively slidably connected to the first scanning slide rail 221 and the second scanning slide rail 222, and the projection lens device 3 is slidably connected to the first slide rail 21. The sliding mechanism 2 comprises a first driving motor and a second driving motor, the first driving motor drives the projection lens device 3 to slide along the first slide rail 21, and the second driving motor drives the first slide rail 21 to slide along the second slide rail 22, so as to adjust the positions of the projection lens device 3 in the x direction and the y direction through the first driving motor and the second driving motor, thereby realizing dynamic projection of the projection lens device 3, and enabling the 3D printing equipment to meet large-size processing and improve the processing efficiency of the 3D printing equipment.

[0054] In a specific embodiment, the second driving motor drives the first slide rail 21 to be connected to one side of the first scanning slide rail 221, the width of the first scanning slide rail 221 is greater than the width of the second scanning slide rail 222, so as to enhance the stability of the sliding of the first slide rail 21 and the second slide rail 22, the second driving motor only drives the first slide rail 21 and one side of the first scanning slide rail 221, the first scanning slide rail 221 can be regarded as the active sliding side of the first slide rail 21, and the second scanning slide rail 222 can be regarded as the driven sliding side of the first slide rail 21, so as to ensure the synchronization of the sliding of the two sides of the first slide rail 21 on the second slide rail 22, avoid the situation that the positions of the two sides of the first slide rail 21 are out of synchronization due to the driving of the two sides of the first slide rail 21 by different motors, and thus ensure the position accuracy of the projection lens device 3.

[0055] In one embodiment, the lifting mechanism 5 comprises a lifting drive motor 51, a screw rod 52 connected to the output end of the lifting drive motor 51, and a screw block cooperating with the screw rod 52. The screw rod 52 extends in the vertical direction. Since the screw rod 52 is connected to the output end of the lifting drive motor 51, the lifting drive motor 51 drives the screw rod 52 to rotate when it is turned on. The screw block can move up and down along the screw rod 52. The forming platform 42 is fixedly connected to the screw block, so that the forming platform 42 moves up and down synchronously with the screw block, thereby precisely adjusting the height of the forming platform 42.

[0056] Further, the lifting mechanism 5 further comprises a support plate 53 connected to the screw block, and a support frame 54 connected to the support plate 53. Specifically, the support frame 54 extends in the vertical direction. One end of the support frame 54 is fixed to the side of the support plate 53 away from the screw block, and the other end of the support frame 54 is close to the resin tank. The forming platform 42 is fixed to the side of the support frame 54 close to the resin tank 41.

[0057] Preferably, the lifting mechanism 5 further comprises a pair of guide rails 55 located on both sides of the screw rod 52. The guide rails 55 extend in the vertical direction. The two sides of the support plate 53 are slidably connected to the guide rails 55. When the support plate 53 moves synchronously with the screw block, the support plate 53 slides along the guide rails 55, thereby avoiding the shaking of the support plate 53 during the up and down movement, improving the accuracy of the position of the imaging platform fixed to the support frame 54 during the up and down movement, and ensuring the precision of each layer printing of the 3D printing device.

[0058] Further, the material tank module 4 in the utility model comprises a liquid level sensor, and the liquid level sensor is electrically connected with the controller. The controller can control the liquid level sensor to measure the liquid level height in the material tank module 4 every fixed time, and remind the operator to add photosensitive resin into the resin tank 41 when the liquid level measurement value is lower than the preset height. In some embodiments, the 3D printing device can also be provided with an automatic feeding device, thereby improving the automation degree of the 3D printing device.

[0059] The material tank module 4 is also provided with a control coating assembly. The coating assembly is electrically connected with the controller. After the corresponding resin of each forming surface is solidified and formed, the coating assembly moves horizontally in the resin tank, so that the photosensitive resin uniformly covers the next forming surface. The coating assembly of the utility model cooperates with the liquid level sensor, can control the forming surface height and the liquid level flatness, so that the forming surface is within the forming thickness range and does not warp and deform.

[0060] The 3D printing equipment can realize dynamic projection of the projection lens device 3 by controlling the projection lens device 3 to slide on the first sliding rail 21 and the second sliding rail 22, adjusting the projection position of the projection lens device 3 in the x direction and the y direction, so that the 3D printing equipment can meet large-size processing and improve the processing efficiency of the 3D printing equipment. In addition, the DMD chip 31 in the 3D printing equipment of the utility model is provided with an inclined scanning angle, the projection pattern precision of the DMD chip 31 is improved, the 3D printing equipment can meet super-large-size object printing, and high-precision printing is realized.

[0061] The above is only the preferred specific implementation manner of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. A light-cured 3D printing device, characterized in that, The application relates to a 3D printing device, which comprises a base, a sliding mechanism, a projection lens device, a vat module and a lifting mechanism. The sliding mechanism is provided with two groups of sliding rails arranged perpendicularly to each other and used for adjusting the position of a projection pattern. The projection lens device is slidably connected to the sliding mechanism and comprises a light source, a DMD chip and optical lenses and is used for generating a projection pattern. The vat module is arranged below the projection lens device and comprises a resin vat for containing liquid photosensitive resin and a molding platform for carrying a molded part. The lifting mechanism is connected to the molding platform and is used for adjusting the height of the molding platform in the vertical direction. A controller is used for linkage control of the sliding mechanism, the projection lens device and the lifting mechanism. The projection lens device comprises a light source, a DMD chip and optical lenses, the projection lens device is mounted on a group of the sliding rails, and the DMD chip and the sliding rails form an inclined scanning angle. The sliding mechanism comprises first sliding rails and second sliding rails, the first sliding rails and the second sliding rails are perpendicular to each other and are respectively used for adjusting the stepping direction and the scanning direction of the projection lens device.

2. The light-cured 3D printing device according to claim 1, characterized in that, The second sliding rails comprise first scanning sliding rails and second scanning sliding rails arranged oppositely along the x direction, the first sliding rails are slidably connected to the first scanning sliding rails and the second scanning sliding rails at two ends respectively, and the projection lens device is slidably connected to the first sliding rails.

3. The light-cured 3D printing device of claim 2, wherein, The sliding mechanism comprises first driving motors and second driving motors, the first driving motors drive the projection lens device to slide along the first sliding rails, and the second driving motors drive the first sliding rails to slide along the second sliding rails. The width of the first scanning sliding rails is greater than that of the second scanning sliding rails, and the second driving motors drive the side, where the first sliding rails are connected to the first scanning sliding rails.

4. The light-cured 3D printing device of claim 3, wherein, The lifting mechanism comprises a lifting driving motor, a screw rod connected to the output end of the lifting driving motor and a screw block matched with the screw rod, and the molding platform is fixedly connected to the screw block.

5. The light-cured 3D printing device of claim 1, wherein, The lifting mechanism further comprises a support plate connected to the screw block and a support frame connected to the support plate, and the molding platform is fixed to the side, where the support frame is close to the resin vat.

6. The light-cured 3D printing device of claim 5, wherein, The lifting mechanism further comprises a pair of guide rails arranged on the two sides of the screw rod, and the two sides of the support plate are slidably connected to the guide rails.

7. The light-cured 3D printing device according to claim 6, characterized in that, The vat module is provided with a coating assembly, and the coating assembly is electrically connected to the controller.

8. The light-cured 3D printing device of claim 1, wherein, The projection lens device further comprises a DMD driving module used for controlling the projection imaging of the DMD chip, and the DMD driving module is electrically connected to the controller.

9. The light-cured 3D printing device according to claim 1 or 8, characterized in that, ​ 10. The light-cured 3D printing device of claim 1, wherein, ​

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