Photocuring printing system integrating multi-wavelength gradient curing and online cleaning

Abstract

The invention relates to the technical field of photocuring printing, in particular to a photocuring printing system integrating multi-wavelength gradient curing and online cleaning, comprising: a discharge module for quantitatively outputting a printing material and controlling the printing thickness of each layer; the curing module is used for carrying out gradient curing on the printing material by switching working modes, and the working modes comprise the first working mode used for deep curing and the second working mode used for surface curing; the detection module is used for acquiring the curing degree, the hardness, the shrinkage rate and the curing depth ratio of the material; and the control module is respectively connected with the discharging module, the curing module and the detection module, and is used for judging the qualification of the initial parameter setting of the photocuring according to the curing characteristic value of the pre-printed material and determining the reason for the disqualification of the initial parameter setting of the photocuring according to the curing depth proportion of the material. The precision and efficiency of photocuring printing are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of photocuring printing, and particularly to a photocuring printing system integrating multi-wavelength gradient curing and online cleaning. Background Art

[0002] Due to advantages such as high precision and high surface quality, the photocuring 3D printing technology has been widely used in fields such as precision manufacturing and biomedicine. However, traditional photocuring systems usually adopt a single-wavelength light source, which is difficult to adapt to the curing requirements of different photosensitive resins, restricting the flexibility of material development. In addition, existing systems often lack an efficient resin tank cleaning mechanism during interlayer printing. Residual uncured resin can cause problems such as interlayer contamination and surface defects, affecting the accuracy and mechanical properties of the formed parts.

[0003] Chinese Patent Application Publication No.: CN110901057A discloses a photocuring 3D printing system, including a material carrier and a spreading device. The spreading device is of a conveyor belt structure. At least part of the spreading side of the spreading device is a light-transmitting area. The spreading device and the material carrier perform relative translational movement to lay the photosensitive printing material on the material carrier opposite to the light-transmitting area. When the laid photosensitive printing material is still in a squeezed state, a light beam passes through the light-transmitting area and selectively irradiates the photosensitive printing material opposite to the light-transmitting area according to the three-dimensional model information to be printed to form a cured layer. The spreading device and the material carrier can perform relative vertical movement. During the printing process, the distance between the spreading device and the material carrier is increased, and a cured model is formed by stacking the cured layers layer by layer on the material carrier.

[0004] However, the following problems exist in the prior art: The use of a single-wavelength light source for curing in the prior art results in limited curing effects. At the same time, the lack of an online cleaning module leads to insufficient bonding strength between printing layers. Summary of the Invention

[0005] Therefore, the present invention provides a photocuring printing system integrating multi-wavelength gradient curing and online cleaning to overcome the problem of low printing accuracy caused by a single wavelength and the lack of an online cleaning module in the prior art.

[0006] To achieve the above object, the present invention provides a photocuring printing system integrating multi-wavelength gradient curing and online cleaning, including: A discharging module for quantitatively outputting printing materials and controlling the thickness of each printing layer; The curing module is used to perform gradient curing on the printing material by switching the working mode. Among them, the working mode includes a first working mode for deep curing and a second working mode for surface curing. The parameters of the first working mode include a first preset wavelength, a first preset exposure duration, and a first preset exposure power. The parameters of the second working mode include a second preset wavelength, a second preset exposure duration, and a second preset exposure power; The detection module includes a first detection unit for obtaining the curing degree of the material, a second detection unit for obtaining the hardness of the material, and a third detection unit for obtaining the proportion of the curing depth of the material; The control module is respectively connected to the discharging module, the curing module, and the detection module, and is used to determine the qualification of the initial parameter settings of the photocuring according to the curing characteristic values of the material after pre-printing, and to determine the reasons for the unqualified initial parameter settings of the photocuring according to the proportion of the curing depth of the material.

[0007] Further, it also includes a cleaning module and an image acquisition module. Among them, the cleaning module is used to remove the uncured resin, and the image acquisition module is used to obtain the shrinkage rate and surface smoothness of the material; The control module is also respectively connected to the cleaning module and the image acquisition module, and is used to secondarily determine the qualification of the initial parameter settings of the photocuring according to the shrinkage rate of the material, and to determine the qualification of the cleaning parameter settings according to the surface smoothness of the material.

[0008] Further, the control module determines the qualification of the initial parameter settings of the photocuring according to the curing characteristic values of the material after pre-printing. Among them, if the curing characteristic value of the material is less than the first preset curing characteristic value, it is determined that the initial parameter settings of the photocuring are unqualified, and the first preset exposure duration is increased according to the difference between the first preset curing characteristic value and the curing characteristic value of the material; If the curing characteristic value of the material is greater than or equal to the first preset curing characteristic value and less than the second preset curing characteristic value, it is determined that the initial parameter settings of the photocuring are unqualified, and the qualification of the initial parameter settings of the photocuring is secondarily determined according to the shrinkage rate of the material; If the curing characteristic value of the material is greater than or equal to the second preset curing characteristic value, it is determined that the initial parameter settings of the photocuring are qualified, and the material that has completed photocuring is cleaned online.

[0009] Further, the pre-printing process includes: Slicing the three-dimensional model according to a preset layer thickness and performing printing; After each layer of printing is completed, the first working mode is used to perform photocuring treatment on the printed part; After every first preset number of layers of printing are completed, the second working mode is used to perform photocuring treatment on the printed part; Online cleaning is performed after every second preset layer is printed; Pre-printing is completed when printing reaches the third preset layer.

[0010] Furthermore, the material curing characteristic value is jointly determined by the curing degree and hardness of the material.

[0011] Furthermore, the control module secondarily determines the qualification of the initial parameter settings of photocuring according to the shrinkage rate of the material. Among them, if the shrinkage rate is less than the first preset shrinkage rate, the initial parameter settings of photocuring are secondarily determined to be qualified, and the material that has completed photocuring is cleaned online; If the shrinkage rate is greater than or equal to the first preset shrinkage rate and less than the second preset shrinkage rate, the initial parameter settings of photocuring are secondarily determined to be unqualified, and the reason for the unqualified initial parameter settings of photocuring is determined according to the curing depth ratio of the material; If the shrinkage rate is greater than or equal to the second preset shrinkage rate, the initial parameter settings of photocuring are secondarily determined to be unqualified, and the first preset number of layers is increased according to the difference between the shrinkage rate and the second preset shrinkage rate.

[0012] Furthermore, the control module determines the reason for the unqualified initial parameter settings of photocuring according to the curing depth ratio of the material. Among them, if the curing depth ratio is less than the preset curing depth ratio, it is determined that the reason for the unqualified is that the single-layer printing thickness does not meet the standard, and the single-layer printing thickness is reduced according to the difference between the preset curing depth ratio and the curing depth ratio; If the curing depth ratio is greater than or equal to the preset curing depth ratio, it is determined that the reason for the unqualified is that the exposure duration of printing does not meet the standard, and the first preset exposure power is increased according to the difference between the curing depth ratio and the preset curing depth ratio.

[0013] Furthermore, there are several adjustment methods for the single-layer printing thickness, and each adjustment method has a different adjustment range for the single-layer printing thickness.

[0014] Furthermore, the first preset exposure power is positively correlated with the difference in the second curing depth ratio, where the difference in the second curing depth ratio is the difference between the curing depth ratio and the preset curing depth ratio.

[0015] Furthermore, based on the condition that the surface smoothness of the material is greater than the preset smoothness, it is determined that the cleaning parameter settings are unqualified, and the ultrasonic frequency is increased according to the difference between the surface smoothness of the material and the preset smoothness.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows. The present invention integrates a curing module with multi-wavelength gradient and an on-line cleaning module based on ultrasonic waves, realizing the full-process automatic processing of the photocured printed parts from layer-by-layer forming to cleaning and strengthening, saving labor costs and improving printing efficiency.

[0017] Furthermore, by adopting the multi-wavelength gradient curing technology with a first working mode and a second working mode, the present invention can dynamically adjust the wavelength, exposure duration and power according to different curing requirements, solve the problems of insufficient deep curing or over-curing on the surface layer caused by single-wavelength curing, and significantly improve the dimensional accuracy and mechanical properties of the printed parts.

[0018] Furthermore, the present invention integrates an automatic cleaning module to timely remove the residual uncured resin after curing, avoid interlayer contamination, ensure the uniformity of subsequent material laying, thereby improving the interlayer bonding force and the overall structural strength, while reducing the post-treatment cleaning process and improving printing efficiency.

[0019] Furthermore, the present invention introduces a pre-printing process. Through the stage-by-stage tests of layer-by-layer curing and on-line cleaning, it can identify and correct parameter setting problems in advance, avoid batch defects in formal printing, and reduce material waste.

[0020] Furthermore, when the present invention determines that the initial parameter setting of photocuring is unqualified according to the material curing characteristic value after pre-printing, it increases the first preset exposure duration, or, determines the qualification of the initial parameter setting of photocuring again according to the shrinkage rate of the material. Through the intelligent parameter dynamic adjustment mechanism and double determination, the accuracy and flexibility of printing parameter adjustment are increased.

[0021] Furthermore, based on the condition that the initial parameter setting of photocuring is determined to be unqualified after secondary determination, the present invention determines the reason for the unqualified initial parameter setting of photocuring according to the curing depth ratio of the material, provides a differential adjustment strategy, and at the same time supports a multi-gear adjustment method, taking into account the accuracy and flexibility of parameter adjustment and adapting to the characteristic requirements of different materials. Description of the Drawings

[0022] Figure 1 is a schematic diagram of module connection of the photocuring printing system integrating multi-wavelength gradient curing and on-line cleaning according to an embodiment of the present invention; Figure 2 is a flowchart for determining the qualification of the initial parameter setting of photocuring according to the material curing characteristic value in an embodiment of the present invention; Figure 3 is a flowchart for secondary determination of the qualification of the initial parameter setting of photocuring according to the shrinkage rate of the material in an embodiment of the present invention; Figure 4The flowchart shows the reasons for the non - compliance of the initial parameter settings of photocuring determined according to the curing depth ratio of the material in the embodiments of the present invention. Detailed implementation manners

[0023] In order to make the objectives and advantages of the present invention more clear, the present invention will be further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and do not limit the protection scope of the present invention.

[0025] It should be noted that the data in this embodiment are all obtained through comprehensive analysis and evaluation of the historical detection data and corresponding historical detection results of the present invention in the three months before this detection. Those skilled in the art can understand that the determination method of the present invention for the above - mentioned single parameter can be to select the value with the highest proportion according to the data distribution as the preset standard parameter, use weighted summation to obtain the value as the preset standard parameter, substitute each historical data into a specific formula and use the value obtained by the formula as the preset standard parameter, or other selection methods, as long as it meets the requirement that the present invention can clearly define different specific situations in the single - item determination process through the obtained values.

[0026] Please refer to Figures 1 to 4 As shown, they are respectively the module connection schematic diagram of the photocuring printing system integrating multi - wavelength gradient curing and online cleaning in the embodiments of the present invention; the flowchart for determining the qualification of the initial parameter settings of photocuring according to the curing characteristic values of the material in the embodiments of the present invention; the flowchart for re - determining the qualification of the initial parameter settings of photocuring according to the shrinkage rate of the material in the embodiments of the present invention; the flowchart for determining the reasons for the non - compliance of the initial parameter settings of photocuring according to the curing depth ratio of the material in the embodiments of the present invention.

[0027] The photocuring printing system integrating multi - wavelength gradient curing and online cleaning in the embodiments of the present invention includes: A discharging module, used for quantitatively outputting printing materials and controlling the thickness of each layer of printing; A curing module, used for gradient curing the printing material by switching the working mode, wherein the working mode includes a first working mode for deep - layer curing and a second working mode for surface - layer curing. The parameters of the first working mode include a first preset wavelength, a first preset exposure duration, and a first preset exposure power, and the parameters of the second working mode include a second preset wavelength, a second preset exposure duration, and a second preset exposure power; A detection module, which includes a first detection unit for obtaining the curing degree of the material, a second detection unit for obtaining the hardness of the material, and a third detection unit for obtaining the proportion of the curing depth of the material; A control module, which is respectively connected to the discharging module, the curing module and the detection module, and is used to determine the qualification of the initial parameter setting of the photocuring according to the cured characteristic value of the material after pre-printing, and to determine the reason for the unqualified initial parameter setting of the photocuring according to the proportion of the curing depth of the material.

[0028] In the embodiment of the present invention, the first preset wavelength is 385nm, the initial value of the first preset exposure duration is 4s, the initial value of the first preset exposure power is 100mW / cm², the second preset wavelength is 405nm, the second preset exposure duration is 1s, and the second preset exposure power is 60mW / cm². However, the above values are not limited to this, and those skilled in the art can adjust the above values according to actual needs.

[0029] Specifically, the first detection unit is an infrared spectrometer, which is used to measure the curing degree of the material, the second detection unit is a Shore hardness tester, which is used to measure the hardness of the material, and the third detection unit is a microscope, which is used to measure the curing depth of the material to obtain the proportion of the curing depth.

[0030] Specifically, it further includes a cleaning module and an image acquisition module. Among them, the cleaning module is used to remove the uncured resin, and the image acquisition module is used to obtain the shrinkage rate and surface smoothness of the material; The control module is also respectively connected to the cleaning module and the image acquisition module, and is used to re-determine the qualification of the initial parameter setting of the photocuring according to the shrinkage rate of the material, and to determine the qualification of the cleaning parameter setting according to the surface smoothness of the material.

[0031] Specifically, the cleaning module uses an ultrasonic spray head to rinse the residual resin on the surface of the workpiece directionally, and the image acquisition module uses an industrial camera combined with image processing software to obtain the shrinkage rate and surface smoothness of the material.

[0032] Specifically, the control module determines the qualification of the initial parameter setting of the photocuring according to the cured characteristic value of the material after pre-printing. Among them, if the cured characteristic value of the material is less than the first preset cured characteristic value of 0.85, it is determined that the initial parameter setting of the photocuring is unqualified, and the first preset exposure duration is increased according to the difference between the first preset cured characteristic value and the cured characteristic value of the material; If the material curing characteristic value is greater than or equal to the first preset curing characteristic value and less than 0.90 of the second preset curing characteristic value, it is determined that the initial parameter setting of the light curing is unqualified, and the qualification of the initial parameter setting of the light curing is re-determined according to the shrinkage rate of the material; If the material curing characteristic value is greater than or equal to the second preset curing characteristic value, it is determined that the initial parameter setting of the light curing is qualified, and the material that has completed the light curing is cleaned online.

[0033] In the embodiment of the present invention, the value of the first preset curing characteristic value is 0.85, and the value of the second preset curing characteristic value is 0.90. However, the above values are not limited thereto, and those skilled in the art can adjust the above values according to actual needs.

[0034] Specifically, the first preset exposure duration is positively correlated with the curing characteristic difference, where the curing characteristic difference is the difference between the first preset curing characteristic value and the material curing characteristic value, and the adjustment range of the first preset exposure duration is 4 - 8 s.

[0035] Specifically, the pre-printing process includes: Slicing the three-dimensional model according to a preset layer thickness of 100 μm and performing printing; After each layer of printing is completed, the printed part is subjected to light curing treatment in the first working mode; After every 5 layers of the first preset number of layers are printed, the printed part is subjected to light curing treatment in the second working mode; After every 10 layers of the second preset number of layers are printed, online cleaning is performed; When printing reaches the third preset number of layers of 20, the pre-printing is completed.

[0036] In the embodiment of the present invention, the initial value of the preset layer thickness is 100 μm, the initial value of the first preset number of layers is 5, the value of the second preset number of layers is 10, and the value of the third preset number of layers is 20. However, the above values are not limited thereto, and those skilled in the art can adjust the above values according to actual needs.

[0037] Specifically, the material curing characteristic value is jointly determined by the curing degree and hardness of the material, and is calculated by the following formula , in the formula, is the material curing characteristic value, is the first weight coefficient, set = 0.6, is the curing degree, is the second weight coefficient, set = 0.4, is the hardness, is the hardness threshold, set =85 Shore D。

[0038] Specifically, the control module secondarily determines the qualification of the initial parameter setting of photocuring according to the shrinkage rate of the material. Among them, if the shrinkage rate is less than the first preset shrinkage rate of 2%, it is secondarily determined that the initial parameter setting of photocuring is qualified, and the material that has completed photocuring is cleaned online; If the shrinkage rate is greater than or equal to the first preset shrinkage rate and less than the second preset shrinkage rate of 5%, it is secondarily determined that the initial parameter setting of photocuring is unqualified, and the reason for the unqualified initial parameter setting of photocuring is determined according to the curing depth ratio of the material; If the shrinkage rate is greater than or equal to the second preset shrinkage rate, it is secondarily determined that the initial parameter setting of photocuring is unqualified, and the first preset number of layers is increased according to the difference between the shrinkage rate and the second preset shrinkage rate.

[0039] In the embodiment of the present invention, the value of the first preset shrinkage rate is 2%, and the value of the second preset shrinkage rate is 5%. However, the above values are not limited to this, and those skilled in the art can adjust the above values according to actual needs.

[0040] Specifically, the first preset number of layers is positively correlated with the shrinkage rate difference, where the shrinkage rate difference is the difference between the shrinkage rate and the second preset shrinkage rate, and the adjustment range of the first preset number of layers is 5 to 10.

[0041] Specifically, the control module determines the reason for the unqualified initial parameter setting of photocuring according to the curing depth ratio of the material. Among them, if the curing depth ratio is less than the preset curing depth ratio of 92%, it is determined that the reason for the unqualified is that the single-layer printing thickness does not meet the standard, and the single-layer printing thickness is reduced according to the difference between the preset curing depth ratio and the curing depth ratio; If the curing depth ratio is greater than or equal to the preset curing depth ratio, it is determined that the reason for the unqualified is that the printing exposure duration does not meet the standard, and the first preset exposure power is increased according to the difference between the curing depth ratio and the preset curing depth ratio.

[0042] In the embodiment of the present invention, the value of the preset curing depth ratio is 92%. However, the above value is not limited to this, and those skilled in the art can adjust the above value according to actual needs.

[0043] Specifically, there are several adjustment methods for the single-layer printing thickness, and each adjustment method has a different adjustment range for the single-layer printing thickness. Among them, if the first curing depth ratio difference is less than the first preset ratio threshold of 2%, the first thickness adjustment coefficient of 0.9 is used to reduce the single-layer printing thickness to the corresponding value; If the difference in the first curing depth ratio is greater than or equal to the first preset ratio threshold and less than the second preset ratio threshold of 5%, the second thickness adjustment coefficient of 0.78 is used to reduce the single-layer printing thickness to the corresponding value; If the difference in the first curing depth ratio is greater than or equal to the second preset ratio threshold, the third thickness adjustment coefficient of 0.6 is used to reduce the single-layer printing thickness to the corresponding value; The difference in the first curing depth ratio is the difference between the preset curing depth ratio and the curing depth ratio.

[0044] In the embodiments of the present invention, the value of the first preset ratio threshold is 2%, and the value of the second preset ratio threshold is 5%. However, the above values are not limited thereto, and those skilled in the art can adjust the above values according to actual needs.

[0045] Specifically, the single-layer printing thickness is adjusted by the control module controlling the discharge amount of the discharge module.

[0046] Specifically, the first preset exposure power is positively correlated with the difference in the second curing depth ratio. Among them, if the difference in the second curing depth ratio is less than the third preset ratio threshold of 3%, the first power adjustment coefficient of 1.5 is used to increase the first preset exposure power to the corresponding value; If the difference in the second curing depth ratio is greater than or equal to the third preset ratio threshold and less than the fourth preset ratio threshold of 6%, the second power adjustment coefficient of 1.3 is used to increase the first preset exposure power to the corresponding value; If the difference in the second curing depth ratio is greater than or equal to the fourth preset ratio threshold, the third power adjustment coefficient of 1.1 is used to increase the first preset exposure power to the corresponding value; The difference in the second curing depth ratio is the difference between the curing depth ratio and the preset curing depth ratio.

[0047] In the embodiments of the present invention, the value of the third preset ratio threshold is 3%, and the value of the fourth preset ratio threshold is 6%. However, the above values are not limited thereto, and those skilled in the art can adjust the above values according to actual needs.

[0048] Specifically, based on the condition that the surface smoothness of the material is greater than the preset smoothness of 5 μm, it is determined that the cleaning parameter setting is unqualified, and the ultrasonic frequency is increased according to the difference between the surface smoothness of the material and the preset smoothness.

[0049] In the embodiments of the present invention, the value of the preset smoothness is 5 μm. However, the above values are not limited thereto, and those skilled in the art can adjust the above values according to actual needs.

[0050] Specifically, the ultrasonic frequency is positively correlated with the smoothness difference, where the smoothness difference is the difference between the surface smoothness of the material and the preset smoothness, and the adjustment range of the ultrasonic frequency is 30 - 40 kHz.

[0051] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0052] The above are only the preferred embodiments of the present invention and are not used to limit the present invention; for those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An optical curing printing system integrating multi-wavelength gradient curing and on-line cleaning, characterized in that Comprising: A discharging module, configured to quantitatively output printing materials and control the thickness of each printed layer; A curing module, configured to perform gradient curing on the printing materials by switching working modes, wherein the working modes include a first working mode for deep curing and a second working mode for surface curing, and the parameters of the first working mode include a first preset wavelength, a first preset exposure duration, and a first preset exposure power, and the parameters of the second working mode include a second preset wavelength, a second preset exposure duration, and a second preset exposure power; A detection module, which includes a first detection unit for obtaining the degree of material curing, a second detection unit for obtaining the material hardness, and a third detection unit for obtaining the proportion of the curing depth of the material; A control module, which is respectively connected to the discharging module, the curing module, and the detection module, and is configured to determine the qualification of the initial parameter settings of the light curing according to the cured characteristic values of the materials after pre-printing, and determine the reasons for the unqualified initial parameter settings of the light curing according to the proportion of the curing depth of the materials.

2. The photocuring printing system integrating multi-wavelength gradient curing and on-line cleaning according to claim 1, wherein It further includes a cleaning module and an image acquisition module, wherein the cleaning module is used to remove uncured resin, and the image acquisition module is used to obtain the shrinkage rate and surface smoothness of the materials; The control module is also respectively connected to the cleaning module and the image acquisition module, and is configured to secondarily determine the qualification of the initial parameter settings of the light curing according to the shrinkage rate of the materials, and determine the qualification of the cleaning parameter settings according to the surface smoothness of the materials.

3. The light-curing printing system integrating multi-wavelength gradient curing and on-line cleaning according to claim 1, wherein The control module determines the qualification of the initial parameter settings of the light curing according to the cured characteristic values of the materials after pre-printing. Wherein, if the cured characteristic value of the material is less than the first preset cured characteristic value, it is determined that the initial parameter settings of the light curing are unqualified, and the first preset exposure duration is increased according to the difference between the first preset cured characteristic value and the cured characteristic value of the material; If the cured characteristic value of the material is greater than or equal to the first preset cured characteristic value and less than the second preset cured characteristic value, it is determined that the initial parameter settings of the light curing are unqualified, and the qualification of the initial parameter settings of the light curing is secondarily determined according to the shrinkage rate of the materials; If the cured characteristic value of the material is greater than or equal to the second preset cured characteristic value, it is determined that the initial parameter settings of the light curing are qualified, and the materials that have completed light curing are cleaned online.

4. The photocuring printing system integrating multi-wavelength gradient curing and on-line cleaning according to claim 3, characterized in that, The pre-printing process includes: Slicing the three-dimensional model according to a preset layer thickness and performing printing; After each layer of printing is completed, the first working mode is adopted to perform light curing treatment on the printed part; After every first preset number of layers of printing are completed, the second working mode is adopted to perform light curing treatment on the printed part; Online cleaning is performed after every second preset number of layers of printing are completed; When printing reaches the third preset number of layers, the pre-printing is completed.

5. The photocuring printing system integrating multi-wavelength gradient curing and on-line cleaning according to claim 3, wherein The cured characteristic value of the material is jointly determined by the degree of material curing and hardness.

6. The photocuring printing system integrating multi-wavelength gradient curing and on-line cleaning according to claim 2, wherein, The control module secondarily determines the qualification of the initial parameter settings of the light curing according to the shrinkage rate of the materials. Wherein, if the shrinkage rate is less than the first preset shrinkage rate, it is secondarily determined that the initial parameter settings of the light curing are qualified, and the materials that have completed light curing are cleaned online; If the shrinkage rate is greater than or equal to the first preset shrinkage rate and less than the second preset shrinkage rate, it is determined that the initial parameter setting of the secondary determination of photocuring is unqualified, and the reason for the unqualified initial parameter setting of photocuring is determined according to the curing depth ratio of the material; If the shrinkage rate is greater than or equal to the second preset shrinkage rate, it is determined that the initial parameter setting of the secondary determination of photocuring is unqualified, and the first preset number of layers is increased according to the difference between the shrinkage rate and the second preset shrinkage rate.

7. The photocuring printing system integrating multi-wavelength gradient curing and on-line cleaning according to claim 6, wherein The control module determines the reason for the unqualified initial parameter setting of photocuring according to the curing depth ratio of the material. Among them, if the curing depth ratio is less than the preset curing depth ratio, it is determined that the reason for the unqualified is that the single-layer printing thickness does not meet the standard, and the single-layer printing thickness is reduced according to the difference between the preset curing depth ratio and the curing depth ratio; If the curing depth ratio is greater than or equal to the preset curing depth ratio, it is determined that the reason for the unqualified is that the exposure duration of printing does not meet the standard, and the first preset exposure power is increased according to the difference between the curing depth ratio and the preset curing depth ratio.

8. The photocuring printing system integrating multi-wavelength gradient curing and on-line cleaning according to claim 7, wherein, There are several adjustment methods for the single-layer printing thickness, and each adjustment method has a different adjustment range for the single-layer printing thickness.

9. The photocuring printing system integrating multi-wavelength gradient curing and on-line cleaning according to claim 7, wherein, The first preset exposure power is positively correlated with the difference in the second curing depth ratio, where the difference in the second curing depth ratio is the difference between the curing depth ratio and the preset curing depth ratio.

10. The photocuring printing system integrating multi-wavelength gradient curing and on-line cleaning according to claim 1, wherein Based on the condition that the surface smoothness of the material is greater than the preset smoothness, it is determined that the cleaning parameter setting is unqualified, and the ultrasonic frequency is increased according to the difference between the surface smoothness of the material and the preset smoothness.

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