CN-120439429-B - Photo-acoustic cooperative 3D printing equipment and method with large curing thickness of ceramic material

CN120439429BCN 120439429 BCN120439429 BCN 120439429BCN-120439429-B

Abstract

The application relates to the technical field of 3D printing, and provides a large-curing-thickness photoacoustic collaborative 3D printing device for ceramic materials and a use method thereof, wherein the device comprises the following components: the printing platform is provided with a trough, a stretched film is arranged on the trough, a material-fishing forming platform is arranged on the printing platform in a lifting manner, the material-fishing forming platform is arranged below or below the stretched film, a leveling component which is in rolling scraping connection with the upper surface or the lower surface of the stretched film is arranged on the printing platform, an ultraviolet light curing light source is arranged right above or below the stretched film, a focusing ultrasonic component is arranged on or in the trough of the printing platform, and the focusing ultrasonic component is positioned on one side of the material-fishing forming platform and faces the material-fishing forming platform to emit ultrasonic waves. By utilizing ultrasonic auxiliary light curing, the curing thickness, curing precision and concentrated release of curing shrinkage stress in the light curing additive manufacturing process can be effectively improved, so that the quality of a printed product is improved.

Inventors

CHENG LIJIN
LI YAN
HAO PENGXIANG
HU NING
CHENG E
DING XIANGYAN
ZHOU JUN

Assignees

河北工业大学

Dates

Publication Date: 20260512
Application Date: 20250527

Claims (9)

1. The large-curing-thickness photoacoustic collaborative 3D printing equipment for ceramic materials comprises a printing platform (1), wherein a trough (2) is arranged on the printing platform (1), a stretched film (3) is arranged on the trough (2), a material dragging forming platform (4) is arranged on the printing platform (1) in a lifting mode, the material dragging forming platform (4) is arranged below or above the stretched film (3), a leveling component (5) which is in rolling scraping connection with the upper surface or the lower surface of the stretched film (3) to level ceramic slurry on the material dragging forming platform (4) is arranged on the printing platform (1), and an ultraviolet light curing light source (6) is arranged right above or right below the stretched film (3), and the large-curing-thickness photoacoustic collaborative 3D printing equipment is characterized by further comprising a focusing ultrasonic component (7), wherein the focusing ultrasonic component (7) is positioned on one side of the material dragging forming platform (4) and emits ultrasonic waves towards the material dragging forming platform (4); if the material taking and forming platform (4) is positioned below the stretched film (3), the leveling component (5) is in rolling scraping connection with the upper surface of the stretched film (3), the ultraviolet light curing light source (6) is positioned right above the stretched film (3) and works in a surface projection mode, the step A series is executed, if the material taking and forming platform (4) is positioned above the stretched film (3), the leveling component (5) is in rolling scraping connection with the lower surface of the stretched film (3), the ultraviolet light curing light source (6) is positioned right below the stretched film (3), and a laser spot is adopted for scanning, the step B series is executed; the step A series comprises the following steps: a1, adding ceramic slurry into a trough (2); a2, firstly, the material-fishing forming platform (4) descends below the liquid level of the ceramic slurry, and then the material-fishing forming platform (4) ascends to a position which enables the ceramic slurry to be solidified on the material-fishing forming platform (4) to be different from the lower surface of the stretched film (3) by a preset single-layer printing thickness; A3, the leveling component (5) is attached to the upper surface of the stretched film (3) to perform reciprocating motion so as to level the ceramic slurry to be solidified on the material fishing forming platform (4); A4, performing ultraviolet light surface contour exposure on the ceramic slurry piece to be cured in the forming area on the material fishing forming platform (4) by using an ultraviolet light curing light source (6) so as to form a quasi-curing area, wherein the contour of the quasi-curing area is slightly smaller than the final printing contour; A5, utilizing a focusing ultrasonic assembly (7) to scan a quasi-curing zone on the material fishing forming platform (4) by sending focusing ultrasonic waves so as to gel ceramic slurry in the quasi-curing zone; A6, on the basis that the focusing ultrasonic assembly (7) continuously loads focusing ultrasonic scanning in the quasi-curing area, when the ultrasonic curing scanning is stopped quickly, the ultraviolet curing light source (6) is used for exposing the finally printed outline of the gelled ceramic slurry for a short time, and precise plasticity is carried out, so that a curing layer is obtained; a7, repeating the steps A2-A6 to gradually obtain a plurality of solidified layers until a product with the required thickness is obtained; the step B series comprises the following steps: b1, adding ceramic slurry into a trough (2); b2, the material fishing forming platform (4) descends to a position different from the upper surface of the stretched film (3) by a preset single-layer printing thickness; B3, the scraping membrane assembly leveling assembly (5) is attached to the lower surface of the stretched membrane (3) to perform reciprocating motion so as to scrape and level ceramic slurry to be solidified between the material dragging forming platform (4) and the stretched membrane (3); b4, performing ultraviolet laser scanning on the ceramic slurry piece to be cured in the forming area on the material fishing forming platform (4) by using an ultraviolet curing light source (6) so as to form a quasi-curing area, wherein the contour of the quasi-curing area is slightly smaller than the final printing contour; B5, utilizing a focusing ultrasonic assembly (7) to scan focused ultrasonic waves emitted by a quasi-curing area on the material fishing forming platform (4) so as to gel ceramic slurry in the quasi-curing area; B6, on the basis that the focusing ultrasonic assembly (7) continues to load focusing ultrasonic scanning, an ultraviolet curing light source (6) is used for scanning a follow-up sound focusing point, and the light focusing point always follows the sound focusing point when advancing; b7, scanning the final printing outline by using an ultraviolet light curing light source (6) to obtain a curing layer; and B8, repeating the steps B2-B7 to gradually obtain a plurality of solidified layers until a product with the required thickness is obtained.
2. The large-curing-thickness photoacoustic collaborative 3D printing apparatus of ceramic material according to claim 1, wherein the focused ultrasound assembly (7) comprises a first upright (71), a first beam (72) and a self-focusing phased array ultrasound probe (73), wherein the first upright (71) is provided with two and is arranged on the printing platform (1) in a sliding manner, two ends of the first beam (72) are respectively fixed on the tops of the two first uprights (71), and the self-focusing phased array ultrasound probe (73) is fixed on the first beam (72) through a first bracket; Or the focusing ultrasonic assembly (7) comprises a self-focusing phased array ultrasonic probe (73), and the self-focusing phased array ultrasonic probe (73) is arranged on the inner side wall of the trough.
3. The large-curing-thickness photoacoustic collaborative 3D printing device of claim 2, wherein the self-focusing phased array ultrasonic probe (73) comprises a plurality of frequency band modules with different frequencies, each frequency band module comprises a plurality of array elements, and the array elements are arranged in an array.
4. The large-curing-thickness photoacoustic cooperative 3D printing apparatus of ceramic material according to claim 3, wherein the leveling component (5) comprises a second upright (51), a second cross beam (52) and a hob (53), wherein the second upright (51) is provided with two and is arranged on the printing platform (1) in a sliding manner, two ends of the second cross beam (52) are respectively fixed on the tops of the two second uprights (51), and the hob (53) is fixed on the lower surface of the second cross beam (52); Or flattening subassembly (5) include fixed guide rail (56), slip crossbeam (55) and hobbing cutter (53), hobbing cutter (53) are fixed the upper surface of slip crossbeam (55), fixed guide rail (56) set up in the lower surface of print platform (1), slip crossbeam (55) are through the reciprocal slip of sharp driving piece drive on fixed guide rail (56).
5. The large-curing-thickness photoacoustic collaborative 3D printing apparatus of claim 4, wherein the printing platform (1) is provided with a mounting guide rail (9), the first upright post (71) and the second upright post (51) are both arranged on the mounting guide rail (9) in a sliding manner, and the first upright post (71) and the second upright post (51) are respectively driven to slide on the mounting guide rail (9) in a reciprocating manner through corresponding linear driving parts.
6. The large curing thickness photoacoustic collaborative 3D printing apparatus of claim 5, wherein the linear driving member is a cylinder, a hydraulic cylinder, an electric push rod or a screw assembly.
7. The large-curing-thickness photoacoustic collaborative 3D printing equipment of ceramic materials according to any one of claims 1 to 6, wherein a lifting assembly (8) is arranged on the printing platform (1), the fishing forming platform (4) is in a Z-shaped structure, one end of the fishing forming platform is fixed on a lifting sliding block (81) of the lifting assembly (8), and the other end of the fishing forming platform is provided with a product forming platform.
8. The large-curing-thickness photoacoustic collaborative 3D printing apparatus of ceramic material according to claim 7, wherein the lifting assembly (8) is a screw assembly.
9. The large-curing-thickness photoacoustic collaborative 3D printing apparatus of claim 6 wherein the first post (71) and the first beam (72) are connected by a first fastening screw (74) and the second post (51) and the second beam (52) are connected by a second fastening screw (54).

Description

Photo-acoustic cooperative 3D printing equipment and method with large curing thickness of ceramic material Technical Field The application belongs to the technical field of 3D printing, and particularly relates to a large-curing-thickness photoacoustic collaborative 3D printing device and method for ceramic materials. Background It is known that photo-cured 3D printing structural functional ceramics are widely used in the fields of electronic information, biomedical and aerospace. The existing photocuring 3D printer irradiates and solidifies and forms through ultraviolet rays or other light sources to solidify layer by layer, and finally a complete 3D model is obtained. Therefore, 3D printing technology has been attracting attention in the field of ceramic additive manufacturing due to its unique operating principles and material properties, and particularly in complex structure forming, relies on a mold to exhibit unique advantages over conventional ceramic production processes (e.g., injection molding, dry press molding). Functional ceramics (such as dielectric ceramics and piezoelectric ceramics) are widely applied in the fields of electronics, communication, energy sources, biomedicine and the like, but the manufacturing of the functional ceramics faces a plurality of challenges, and particularly the characteristics of deep color, high refractive index, large absorbance and the like lead to the difficult formation of the traditional photocuring 3D printing technology. The various functional ceramic powders (such as silicon carbide (SiC) and silicon nitride (Si 3N4)) have strong light absorption characteristics in ultraviolet bands, and the refractive index and the photosensitive resin have large difference, so that the incident light is strongly scattered and attenuated in the slurry. The method is characterized in that the curing thickness is obviously reduced (generally less than 50 mu m), the solid content of the slurry is limited below 40 vol%, the densification requirement of high-performance ceramic is difficult to meet, meanwhile, the irradiation energy density is required to be improved to compensate the penetration loss, so that the transverse scattering of ultraviolet light is aggravated, the forming contour is fuzzy, the dimensional accuracy is reduced, the interlayer bonding strength is insufficient, and the crack and layering defect are easy to initiate. Disclosure of Invention Aiming at the defects of the prior art, the embodiment of the application aims to provide the photo-acoustic cooperative 3D printing equipment with large curing thickness of ceramic materials, which can effectively improve the curing thickness, curing precision and concentrated release of curing shrinkage stress in the photo-curing additive manufacturing process by utilizing ultrasonic to assist photo-curing, thereby improving the quality of printed products. The technical scheme includes that the large-curing-thickness photoacoustic collaborative 3D printing equipment for the ceramic materials comprises a printing platform, a trough is arranged on the printing platform, a stretched film is arranged on the trough, a material dragging forming platform is arranged on the printing platform in a lifting mode, the material dragging forming platform is arranged below or above the stretched film, a leveling component which is in rolling scraping connection with the upper surface or the lower surface of the stretched film to level ceramic slurry on the material dragging forming platform is arranged on the printing platform, an ultraviolet curing light source is arranged right above or right below the stretched film, a focusing ultrasonic component is arranged on the printing platform or in the trough, and the focusing ultrasonic component is located on one side of the material dragging forming platform and emits ultrasonic waves towards the material dragging forming platform. In one embodiment, the focusing ultrasonic assembly comprises two first upright posts, a first cross beam and a self-focusing phased array ultrasonic probe, wherein the two first upright posts are arranged on the printing platform in a sliding manner, two ends of the first cross beam are respectively fixed at the tops of the two first upright posts, and the self-focusing phased array ultrasonic probe is fixed on the first cross beam through a first bracket; Or the focusing ultrasonic assembly comprises a self-focusing phased array ultrasonic probe which is arranged on the inner side wall of the trough. In one embodiment, the self-focusing phased array ultrasonic probe comprises a plurality of frequency band modules with different frequencies, each frequency band module comprises a plurality of array elements, and the array elements are arranged in an array. In one embodiment, the leveling assembly comprises two second upright posts, two second cross beams and a hob, wherein the second upright posts are arranged on the printing platform in a sliding mod