An additive manufacturing device and method with adjustable resolution for surface forming

Abstract

The present invention discloses an additive manufacturing device with adjustable resolution for surface forming, which includes a material tank for containing a forming material. A forming workbench is arranged in the material tank. One side of the forming workbench is connected with a lifting mechanism capable of driving it to move in the material tank along the Z-axis direction. An imaging mechanism with adjustable resolution is arranged on the forming surface side of the forming workbench. By adjusting the resolution of the lens through the imaging mechanism, different areas of the product can be printed, so that the forming accuracy is higher, the forming effect is better, the design cycle of the product can be shortened, and the forming efficiency is improved. The present invention also provides an additive manufacturing method with adjustable resolution for surface forming, which is simple to operate and can also make up for the restrictive relationship between the forming working range and the forming accuracy of surface forming additive manufacturing, so that the forming accuracy is higher and the forming effect is better.

Description

Technical Field

[0001] The present invention relates to an additive manufacturing device and method with adjustable resolution for surface forming.

Background Art

[0002] Rapid prototyping is the additive manufacturing technology. With the accelerating iteration of industrial products and the demand for customization of consumer products, the timeliness of products is getting higher and higher. The traditional product development cycle is: design - outsourcing processing - design modification - reprocessing - completion. The outsourcing processing or self-processing link usually has a cycle of 5 - 10 days, resulting in too long a product design cycle. The emergence of additive manufacturing methods has greatly accelerated the product design modification cycle. There are rich types of additive manufacturing, among which surface forming methods such as DLP / LCOS / LCD have developed rapidly with the advantages of high speed and high precision. However, the surface forming additive manufacturing is limited by the physical resolution of the forming optical devices such as DLP / LCOS / LCD, resulting in a relatively limited forming working range, which in turn affects the forming accuracy, prolongs the product design cycle, reduces the forming efficiency, and increases the production cost at the same time.

[0003] Therefore, the present invention is precisely proposed to solve the above technical problems.

Summary of the Invention

[0004] The object of the present invention is to overcome the deficiencies of the prior art and provide an additive manufacturing device and method with adjustable resolution for surface forming, which shortens the product design cycle, improves the forming efficiency, and is also used to make up for the restrictive relationship between the forming working range and the forming accuracy of surface forming additive manufacturing, making the forming accuracy higher and the forming effect better.

[0005] The present invention is realized through the following technical solutions:

[0006] An additive manufacturing device with adjustable resolution for surface forming includes a material tank 1 for containing the forming material. A forming workbench 2 is arranged in the material tank 1. One side of the forming workbench 2 is connected with a lifting mechanism 3 capable of driving it to move in the material tank 1 along the Z-axis direction. An imaging mechanism 6 with adjustable resolution is arranged on the forming surface side of the forming workbench 2. The imaging mechanism 6 includes a machine base 61 and a lens assembly 62 with adjustable resolution connected to the machine base 61.

[0007] The lens assembly 62 includes a rotatable lens base 621 connected to the machine base 61. At least two lenses 622 with different resolutions are arranged on the lens base 621. A third driving part 623 for driving the lens base 621 to rotate to switch different resolution lenses is also arranged on the lens base 621.

[0008] The lens assembly 62 includes a zoom lens 624 connected to the base 61. The zoom lens 624 includes a lens body 6241 and a lens 6242 disposed inside thereof that can move up and down to change the resolution of the zoom lens. A regulating mechanism 63 is also connected to the base 61 for driving the lens 6242 to move up and down within the lens body 6241 to change the resolution of the adjustable zoom lens 624. The regulating mechanism 63 includes a third fixed seat 631 provided with a regulating rod 632. The regulating mechanism 63 further includes an adjusting member 633 connected to the lens 6242 and capable of moving along the Z-axis relative to the regulating rod 632. A fourth driving portion 634 is provided on the third fixed seat 631 for driving the regulating rod 632 to rotate to change the position of the lens 6242.

[0009] The imaging mechanism 6 is disposed above the forming surface of the forming workbench 2. A coating mechanism 4 is connected to the mouth of the material tank 1 and can move along the Y-axis on the forming workbench 2 for applying the forming material. The coating mechanism 4 includes a coating support plate 41 disposed along the Y-axis and extending out of the material tank 1 at both ends. A coating block 42 is connected to the lower side of the coating support plate 41. Slide rail connection blocks 43 are connected to both ends of the coating support plate 41. A guide rail slider 44 is provided on one side of the slide rail connection block 43. The coating mechanism 4 further includes a guide rail support base 45 connected to one side of the material tank 1 for the movement of the coating support plate 41. A guide rail 451 is provided on the guide rail support base 45 and is engaged with the guide rail slider 44 to enable the coating support plate 41 to move along the Z-axis. A guide rail chute 441 matching the shape of the guide rail 451 is formed on the guide rail slider 44.

[0010] The lifting mechanism 3 includes a first fixed seat 31 with a first chute 311 formed thereon. A first slider 32 capable of sliding up and down is disposed in the first chute 311. A sliding seat 33 capable of sliding along with the first slider 32 is further provided on the first fixed seat 31. A connection assembly 34 for driving the forming workbench 2 to move up and down is connected to the sliding seat 33. A first driving portion 35 for driving the forming workbench 2 to move up and down is further provided at one end of the first fixed seat 31.

[0011] The connection assembly 34 includes a slider connection plate 341 connected to the sliding seat 33. A guide rod 342 is connected to the slider connection plate 341. A connecting member 343 is connected to one side of the upper end of the guide rod 342. A workbench support bar 344 for driving the forming workbench 2 to move up and down is connected to the connecting member 343. The workbench support bar 344 is L-shaped. One side of the workbench support bar 344 extends into the material tank 1 and is connected to the bottom of the forming workbench 2, and the other side of the workbench support bar 344 is connected to the connecting member 343.

[0012] The additive manufacturing equipment further includes a liquid level adjusting mechanism 5 connected to the lifting mechanism 3. The liquid level adjusting mechanism 5 includes a second fixed seat 51 connected to the first fixed seat 31. A second sliding groove 511 is formed on the second fixed seat 51. A guiding seat 512 is arranged in the second sliding groove 511. Connecting plates 52 are arranged at both ends of the second fixed seat 51. A screw rod 53 is arranged between the two connecting plates 52. A moving block 54 that can cooperate with the guiding seat 512 and move up and down is screwed on the screw rod 53. A moving block connecting plate 55 is connected to the moving block 54. A guiding plate 56 is connected to the bottom surface of the moving block connecting plate 55. The other end of the guiding plate 56 is connected to a liquid level block 57 for maintaining the height of the liquid level surface. The liquid level adjusting mechanism 5 further includes a second driving part 58 arranged on the connecting plate 52. The imaging module 6 is connected to the moving block connecting plate 55.

[0013] The imaging mechanism 6 is arranged below the forming surface of the forming workbench 2. The material tank 1 and the lifting mechanism are arranged on the base 7. The imaging mechanism 6 is arranged below the base 7. A leveling mechanism 8 is arranged on the forming workbench 2.

[0014] An adjustable resolution additive manufacturing method for surface forming, using the above additive equipment, is mainly carried out according to the following steps:

[0015] A: The host computer control software separates the internal entity and the external contour of the graphic through an algorithm.

[0016] B: The workbench moves to the working position, that is, the working distance position of the imaging lens.

[0017] C: Through the liquid level adjusting mechanism, the liquid level block is used to lift and lower to maintain the liquid level surface within a certain height range.

[0018] D: Using a low-resolution lens, the imaging module (DMD / LCOS / LCD / OLED) outputs a low-resolution area image. Finally, the low-resolution internal entity graphic is irradiated onto the surface of the photosensitive material, and the printing of the low-resolution internal entity of the current layer model is completed.

[0019] E: The host computer software switches to a high-resolution lens through the lens switching mechanism.

[0020] F: The host computer software outputs a high-resolution area image for the local area of the current layer or the area that needs to be refined through the imaging module (DMD / LCOS / LCD / OLED). The scaling of the image is completed by the host computer algorithm. Finally, the high-resolution external contour graphic is irradiated onto the surface of the photosensitive material, and the printing of the high-resolution external contour of the current layer model is completed.

[0021] G: The workbench moves to the next layer working position.

[0022] H: Repeat steps A - G until the model is completed.

[0023] In step E, the imaging pixel size is changed by switching different imaging lenses or changing the parameters and positions of the internal lenses of the same lens.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] 1. When in use, after the host computer control software separates the internal entity and the external contour of the graph through an algorithm, the forming workbench is adjusted to the working position by the lifting mechanism; the imaging mechanism uses a low - resolution lens to output a low - resolution area image, so that the low - resolution internal entity graph irradiates the forming surface of the forming workbench with photosensitive material, thereby printing the low - resolution internal entity of the current layer model; the imaging mechanism switches to a high - resolution lens by means of lens switching. For a local area of the current layer or an area that requires refined processing, the imaging mechanism outputs a high - resolution area image, so that the high - resolution internal entity graph irradiates the forming surface of the forming workbench with photosensitive material, thereby printing the high - resolution internal entity of the current layer model. Using this device, relatively complex products can be designed. At the same time, through the imaging mechanism that can switch different resolution lenses, the imaging pixel size can be changed. Different resolution imaging lenses are used for different working areas, which can not only speed up the production time, but also improve the imaging accuracy, making the forming effect better, the product quality higher, and at the same time reducing the cost.

[0026] 2. The present invention prints the low - resolution internal entity of the current layer model through a low - resolution lens, and then prints the high - resolution external contour of the current layer model by switching to a high - resolution lens. Using a low - resolution lens can speed up the filling and reduce the production time, and using a high - resolution lens improves the accuracy and refines the surface, making the forming effect better.

Description of the Drawings

[0027] Figure 1 is the perspective view of the first embodiment of the present invention;

[0028] Figure 2 is the perspective view of the lifting mechanism in the first embodiment of the present invention;

[0029] Figure 3 is the side view of the lifting mechanism in the first embodiment of the present invention;

[0030] Figure 4 is the perspective view of the first fixing base in the first embodiment of the present invention;

[0031] Figure 5 is the exploded view of the first fixing base in the first embodiment of the present invention;

[0032] Figure 6 is the perspective view of the liquid level adjusting mechanism in the first embodiment of the present invention;

[0033] Figure 7 is the side view of the liquid level adjusting mechanism in the first embodiment of the present invention;

[0034] Figure 8 is the exploded view of the liquid level adjusting mechanism in the first embodiment of the present invention;

[0035] Figure 9 is the exploded view of the coating mechanism in the first embodiment of the present invention;

[0036] Figure 10 is one of the perspective views of the lens assembly in the first embodiment of the present invention;

[0037] Figure 11 is the other perspective view of the lens assembly in the first embodiment of the present invention;

[0038] Figure 12 is the plan view of the adjusting mechanism in the first embodiment of the present invention;

[0039] Figure 13 is the plan view of the second embodiment of the present invention;

[0040] Figure 14 is the optical path schematic diagram in the first method of the present invention;

[0041] Figure 15 is the optical path schematic diagram in the second method of the present invention.

Specific Embodiments

[0042] The present invention will be further described below with reference to the accompanying drawings:

[0043] Embodiment 1:

[0044] As Figure 1-12As shown in the figure, an additive manufacturing device with adjustable resolution for surface forming includes a material tank 1 for containing forming materials. Inside the material tank 1, there is a forming workbench 2. One side of the forming workbench 2 is connected to a lifting mechanism 3 that can drive it to move in the Z-axis direction within the material tank 1. On the forming surface side of the forming workbench 2, there is an imaging mechanism 6 with adjustable resolution. The imaging mechanism 6 includes a machine base 61 and a lens assembly 62 with adjustable resolution connected to the machine base 61. When the host computer control software separates the internal entity and external contour of the graphic through an algorithm, the forming workbench 2 is adjusted to the working position through the lifting mechanism 3. The imaging mechanism 6 uses a low-resolution lens 91 to output a low-resolution area image, so that the low-resolution internal entity graphic irradiates the forming surface of the forming workbench 2 with photosensitive material, thereby printing the low-resolution internal entity of the current layer model. The imaging mechanism 6 switches to a high-resolution lens 92 by means of lens switching. For a local area of the current layer or an area that needs to be refined, the imaging mechanism 6 outputs a high-resolution area image, so that the high-resolution internal entity graphic irradiates the forming surface of the forming workbench 2 with photosensitive material, thereby printing the high-resolution internal entity of the current layer model. Using this device, relatively complex products can be designed. At the same time, through the imaging mechanism 6 that can switch different resolution lenses, the size of the imaging pixels can be changed, and different resolution imaging lenses are used for different working areas, which can not only speed up the production time, but also improve the imaging accuracy, making the forming effect better, the product quality higher, and at the same time reducing the cost.

[0045] As Figure 1 , Figures 10-11 shown, the lens assembly 62 includes a rotatable lens base 621 connected to the machine base 61. On the lens base 621, there are at least two lenses 622 with different resolutions. On the lens base 621, there is also a third driving part 623 for driving the lens base 621 to rotate to switch different resolution lenses. Using the lens group 62 with switchable lenses can quickly switch lenses with different resolutions, save time, and improve the forming efficiency. In addition, the lens switching can also be completed by translation.

[0046] As Figure 1 and Figure 12As shown, the lens assembly 62 includes a zoom lens 624 connected to the base 61. The zoom lens 624 includes a lens body 6241 and a lens 6242 disposed inside it that can move up and down to change the resolution of the zoom lens. A regulating mechanism 63 is also connected to the base 61 for driving the lens 6242 to move up and down inside the lens body 6241 to change the resolution of the adjustable zoom lens 624. The regulating mechanism 63 includes a third fixing base 631 provided with a regulating rod 632. The regulating mechanism 63 further includes an adjusting member 633 connected to the lens 6242 and capable of moving along the Z-axis relative to the regulating rod 632. A fourth driving portion 634 is provided on the third fixing base 631 for driving the regulating rod 632 to rotate to change the position of the lens 6242. By adjusting the position of the lens 6242 inside the lens body 6241 through the regulating mechanism, the resolution of the zoom lens 624 is adjusted, thereby completing the switching of lenses with different resolutions, achieving printing with different precisions, saving time, and having a better forming effect.

[0047] As Figure 1 and Figure 9 As shown, the imaging mechanism 6 is disposed above the forming surface of the forming workbench 2. A coating mechanism 4 is connected to the mouth of the material tank 1 and can move along the Y-axis direction on the forming workbench 2 for applying the forming material. The coating mechanism 4 includes a coating support plate 41 disposed along the Y-axis and extending out of the material tank 1 at both ends. A coating block 42 is connected to the lower side of the coating support plate 41. Slide rail connection blocks 43 are connected to both ends of the coating support plate 41. A guide rail slider 44 is provided on one side of the slide rail connection block 43. The coating mechanism 4 further includes a guide rail support base 45 connected to one side of the material tank 1 for the coating support plate 41 to move. A guide rail 451 is provided on the guide rail support base 45 that cooperates with the guide rail slider 44 to enable the coating support plate 41 to move along the Z-axis. A guide rail chute 441 matching the shape of the guide rail 451 is formed on the guide rail slider 44. When printing is required, the coating mechanism 4 adsorbs the material from the material tank 1 and is driven by the driving portion. The coating support plate 41 and the coating block 42 can move on the guide rail support base 45 along with the slide rail connection blocks 43 and the guide rail sliders 44. The guide rail chute 441 on the guide rail slider 44 matches the shape of the guide rail 451 on the guide rail support base 45 to facilitate the movement of the coating support plate 41. When the coating support plate 41 and the coating block 42 move from one end of the forming workbench 2 to the other end, the printing of the current layer is completed. Additionally, a self-leveling material can be used, and in this case, the coating mechanism 4 is not required.

[0048] As Figures 2-3As shown in the figure, the lifting mechanism 3 includes a first fixed seat 31. A first sliding groove 311 is formed on the first fixed seat 31. A first sliding block 32 capable of sliding up and down is arranged in the first sliding groove 311. A sliding seat 33 capable of sliding following the first sliding block 32 is further arranged on the first fixed seat 31. A connecting component 34 capable of driving the forming workbench 2 to move up and down is connected to the sliding seat 33. A first driving part 35 for driving the forming workbench 2 to move up and down is arranged at one end of the first fixed seat 31. The first driving part 35 drives the first sliding block 32 to slide in the first sliding groove 311, thereby driving the sliding seat 33 to move. The sliding seat 33 is connected to the connecting component 34, and finally drives the forming workbench 2 to move in the material tank 1 along the Z-axis. By adjusting the position of the forming workbench 2 through the lifting mechanism 3, the structure is simple and easy to operate.

[0049] As Figures 2-3 shown in the figure, the connecting component 34 includes a slider connecting plate 341 connected to the sliding seat 33. A guide rod 342 is connected to the slider connecting plate 341. A connecting piece 343 is connected to one side of the upper end of the guide rod 342. A workbench support bar 344 for driving the forming workbench 2 to move up and down is connected to the connecting piece 343. The workbench support bar 344 is L-shaped. One side of the workbench support bar 344 extends into the material tank 1 and is connected to the bottom of the forming workbench 2. The other side of the workbench support bar 344 is connected to the connecting piece 343. By driving the connecting component 34, the forming workbench 2 is adjusted to work from top to bottom. Each time a layer is formed, the forming workbench 2 sinks once until the model is completed. The connecting component 34 is provided to connect the forming workbench 2 and the lifting mechanism 3, making the structure more compact.

[0050] As Figures 4-5 shown in the figure, the first fixed seat 31 includes a seat body 311 and a shell 312 cooperatively connected with the seat body 311. The sliding seat 33 is arranged between the seat body 311 and the shell 312. The first sliding groove 311 is arranged on the seat body 311. The slider connecting plate 341 is arranged on one side of the shell 312 and is connected to the sliding seat 33. The first driving part 35 drives the first sliding block 32 to drive the sliding seat 33 to move. The sliding seat 33 is clamped between the seat body 311 and the shell 312. A sliding groove capable of matching the shapes of the seat body 311 and the shell 312 is formed on the sliding seat 33, so as to facilitate the movement of the sliding seat 33 on the first fixed seat 31. Arranging the sliding seat 33 between the seat body 311 and the shell 312 can also prevent the sliding seat 33 from detaching from the first fixed seat 31, making the structure of the lifting mechanism 3 more stable.

[0051] As Figures 6-8The described additive manufacturing equipment further includes a liquid level adjusting mechanism 5 connected to the lifting mechanism 3. The liquid level adjusting mechanism 5 includes a second fixed seat 51 connected to the first fixed seat 31. A second chute 511 is formed on the second fixed seat 51. A guiding seat 512 is arranged in the second chute 511. Connecting plates 52 are provided at both ends of the second fixed seat 51. A screw rod 53 is arranged between the two connecting plates 52. A moving block 54 that can cooperate with the guiding seat 512 and move up and down is screwed on the screw rod 53. A moving block connecting plate 55 is connected to the moving block 54. A guiding plate 56 is connected to the bottom surface of the moving block connecting plate 55. The other end of the guiding plate 56 is connected to a liquid level block 57 for maintaining the height of the liquid level surface. The liquid level adjusting mechanism 5 further includes a second driving part 58 arranged on the connecting plate 52. The imaging module 6 is connected to the moving block connecting plate 55. By driving the screw rod 53 to rotate through the second driving part 58, the moving block 54 can move in the second chute 511 on the second fixed seat 51 along with the guiding seat 512. The moving block connecting plate 55 on the moving block 54 drives the guiding plate 56 and the liquid level block 57 at its bottom to move to a proper position. The liquid level surface is adjusted through the liquid level adjusting mechanism 5 to be within a certain height range, making the equipment more accurate and the printing process faster during the printing process.

[0052] Embodiment 2:

[0053] As Figure 13As shown in the figure, an additive manufacturing device with adjustable resolution for surface forming. The imaging mechanism 6 is arranged below the forming surface of the forming workbench 2. The material tank 1 and the lifting mechanism are arranged on the base 7. The imaging mechanism 6 is arranged below the base 7. The forming workbench 2 is provided with a leveling mechanism 8. When the host computer control software separates the internal entity and the external contour of the graphic through an algorithm, the forming workbench 2 is adjusted to the working position through the lifting mechanism 3; the imaging mechanism 6 uses a low-resolution lens 91 to output a low-resolution area image, so that the low-resolution internal entity graphic irradiates the forming surface of the forming workbench 2 with photosensitive material, thereby printing the low-resolution entity inside the current layer model; the imaging mechanism 6 switches to a high-resolution lens 92 by means of lens switching. For a local area of the current layer or an area that needs to be refined, the imaging mechanism 6 outputs a high-resolution area image, so that the high-resolution internal entity graphic irradiates the forming surface of the forming workbench 2 with photosensitive material, thereby printing the high-resolution entity inside the current layer model. Each time a layer is formed, the forming workbench 2 rises once until the model printing is completed. Using this device, relatively complex products can be designed. At the same time, through the imaging mechanism 6 that can switch different resolution lenses, the size of the imaging pixels can be changed. Different resolution imaging lenses are used for different working areas, which can not only speed up the production time, but also improve the imaging accuracy, making the forming effect better, the product quality higher, and at the same time reducing the cost; the leveling mechanism 8 is set to adjust the horizontal position of the forming workbench 2, making the equipment more accurate and the forming effect better.

[0054] Method 1:

[0055] An additive manufacturing method with adjustable resolution for surface forming, which mainly proceeds according to the following steps by using the above additive equipment:

[0056] A: The host computer control software separates the internal entity and the external contour of the graphic through an algorithm;

[0057] B: The workbench moves to the working position, that is, the working distance position of the imaging lens;

[0058] C: Through the liquid level adjustment mechanism, the liquid level is maintained within a certain height range by means of the lifting of the liquid level block;

[0059] D: Use a low-resolution lens to output a low-resolution area image through the imaging module (DMD / LCOS / LCD / OLED). Finally, the low-resolution internal entity graphic irradiates the surface of the photosensitive material, and the low-resolution entity inside the current layer model is printed;

[0060] E: The host computer software switches to a high-resolution lens through the lens switching mechanism;

[0061] F: The host computer software outputs a high-resolution regional image of the current layer's local area or the area that requires fine processing through the imaging module (DMD / LCOS / LCD / OLED). The scaling of the image is completed by the host computer algorithm. Finally, the high-resolution external contour pattern is irradiated onto the surface of the photosensitive material, completing the printing of the high-resolution external contour of the current layer model.

[0062] G: The workbench moves to the next layer's working position.

[0063] H: Repeat steps A - G until the model production is completed.

[0064] As Figure 14 shown, in step E, by switching different imaging lenses, the imaging pixel size is changed. The lens switching mechanism can be in forms such as translation and circumferential switching. By using the low-resolution lens 91, the filling can be accelerated, reducing the production time. By using the high-resolution lens 92, the precision is improved, the surface is refined, and the forming effect is better.

[0065] Method 2:

[0066] As Figure 15 shown, the difference between Method 2 and Method 1 is that:

[0067] In step E, by changing parameters, positions, etc. of the internal lens 631 within the same lens, the imaging pixel size is changed. Through the adjustment mechanism 64 on the zoom lens 63, the position of the internal lens 631 is adjusted to change the lens resolution. First, using the low-resolution lens 91 can accelerate the filling and reduce the production time. Then, it is zoomed to the high-resolution lens 92, improving the precision, refining the surface, and making the forming effect better.

Claims

1. An additive manufacturing device with adjustable resolution for surface forming, characterized in that: It includes a material tank (1) for containing a molding material. A molding workbench (2) is provided inside the material tank (1). One side of the molding workbench (2) is connected to a lifting mechanism (3) capable of driving it to move in the Z-axis direction inside the material tank (1). An imaging mechanism (6) with adjustable resolution is provided on the molding surface side of the molding workbench (2). The imaging mechanism (6) includes a machine base (61) and a lens assembly (62) with adjustable resolution connected to the machine base (61). The lens assembly (62) includes a rotatable lens mount (621) connected to the machine base (61). At least two lenses (622) with different resolutions are provided on the lens mount (621). A third driving part (623) for driving the lens mount (621) to rotate to switch different resolution lenses is also provided on the lens mount (621). The lens assembly (62) includes a zoom lens (624) connected to the machine base (61). The zoom lens (624) includes a lens body (6241) and a lens element (6242) provided inside it that can move up and down to change the resolution of the zoom lens. An adjusting mechanism (63) for driving the lens element (6242) to move up and down inside the lens body (6241) to change the resolution of the adjustable zoom lens (624) is also connected to the machine base (61). The adjusting mechanism (63) includes a third fixing base (631). An adjusting rod (632) is provided on the third fixing base (631). The adjusting mechanism (63) also includes an adjusting part (633) connected to the lens element (6242) and capable of moving along the Z-axis relative to the adjusting rod (632). A fourth driving part (634) for driving the adjusting rod (632) to rotate to change the position of the lens element (6242) is provided on the third fixing base (631). The imaging mechanism (6) is provided above the molding surface of the molding workbench (2). A coating mechanism (4) capable of moving in the Y-axis direction on the molding workbench (2) for coating the molding material is connected to the opening of the material tank (1). The coating mechanism (4) includes a coating support plate (41) arranged along the X-axis and extending out of the material tank (1) at both ends. A coating block (42) is connected to the lower side of the coating support plate (41). Slide rail connection blocks (43) are connected to both ends of the coating support plate (41). A guide rail slider (44) is provided on one side of the slide rail connection block (43). The coating mechanism (4) also includes a guide rail support base (45) connected to one side of the material tank (1) for the coating support plate (41) to move. A guide rail (451) that cooperates with the guide rail slider (44) to make the coating support plate (41) move in the Y-axis direction is provided on the guide rail support base (45). A guide rail chute (441) matching the shape of the guide rail (451) is formed on the guide rail slider (44).

2. The adjustable resolution additive manufacturing apparatus for surface forming according to claim 1, wherein: The lifting mechanism (3) includes a first fixed seat (31). A first sliding groove (311) is formed on the first fixed seat (31). A first slider (32) capable of sliding up and down is arranged in the first sliding groove (311). A sliding seat (33) capable of sliding following the first slider (32) is further arranged on the first fixed seat (31). A connecting component (34) capable of driving the forming workbench (2) to move up and down is connected to the sliding seat (33). A first driving part (35) for driving the forming workbench (2) to move up and down is further arranged at one end of the first fixed seat (31).

3. The adjustable-resolution additive manufacturing device for surface forming according to claim 2, characterized in that: The connecting component (34) includes a slider connecting plate (341) connected to the sliding seat (33). A guide rod (342) is connected to the slider connecting plate (341). A connecting piece (343) is connected to one side of the upper end of the guide rod (342). A workbench support bar (344) for driving the forming workbench (2) to move up and down is connected to the connecting piece (343). The workbench support bar (344) is L-shaped. One side of the workbench support bar (344) extends into the material tank (1) and is connected to the bottom of the forming workbench (2). The other side of the workbench support bar (344) is connected to the connecting piece (343).

4. The adjustable resolution additive manufacturing device for surface forming according to claim 1, characterized in that: The additive manufacturing equipment further includes a liquid level adjusting mechanism (5) connected to the lifting mechanism (3). The liquid level adjusting mechanism (5) includes a second fixed seat (51) connected to the first fixed seat (31). A second sliding groove (511) is formed on the second fixed seat (51). A guide seat (512) is arranged in the second sliding groove (511). Connecting plates (52) are arranged at both ends of the second fixed seat (51). A screw rod (53) is arranged between the two connecting plates (52). A moving block (54) capable of cooperating with the guide seat (512) and moving up and down is screwed on the screw rod (53). A moving block connecting plate (55) is connected to the moving block (54). A guide plate (56) is connected to the bottom surface of the moving block connecting plate (55). The other end of the guide plate (56) is connected to a liquid level block (57) for maintaining the height of the liquid level surface. The liquid level adjusting mechanism (5) further includes a second driving part (58) arranged on the connecting plate (52). The imaging mechanism (6) is connected to the moving block connecting plate (55).

5. The adjustable resolution additive manufacturing device for surface forming according to claim 1, characterized in that: The imaging mechanism (6) is arranged below the forming surface of the forming workbench (2). The material tank (1) and the lifting mechanism are arranged on the base (7). The imaging mechanism (6) is arranged below the base (7). A leveling mechanism (8) is arranged on the forming workbench (2).

6. An additive manufacturing method with adjustable resolution for surface forming, characterized in that: The additive manufacturing equipment as described in any one of claims 1-5 is mainly carried out according to the following steps: A: The host computer control software separates the internal entity and the external contour of the graphic through an algorithm; B: The workbench moves to the working position, that is, the working distance position of the imaging lens; C: Through the liquid level adjusting mechanism, the liquid level block is used to lift and lower to maintain the liquid level within a certain height range; D: Use a low-resolution lens to output a low-resolution area image through the imaging module. Finally, the low-resolution internal entity pattern is irradiated onto the surface of the photosensitive material to complete the printing of the low-resolution internal entity of the current layer model; E: The host computer software switches to a high-resolution lens through the lens switching mechanism; F: For the local area of the current layer or the area that needs to be refined, the host computer software outputs a high-resolution area image through the imaging module. The scaling of the image is completed by the host computer algorithm. Finally, the high-resolution external contour pattern is irradiated onto the surface of the photosensitive material to complete the printing of the high-resolution external contour of the current layer model; G: The workbench moves to the next-layer working position; H: Repeat steps A - G until the model is completed.

7. The adjustable-resolution additive manufacturing method for surface forming according to claim 6, characterized in that: Step E changes the imaging pixel size by switching different imaging lenses or changing the parameters and positions of the internal lenses of the same lens.

Images