阅读说明：本技术 一种液面动态整流光固化三维成形装置及方法 (Liquid level dynamic rectification photocuring three-dimensional forming device and method ) 是由 俞红祥 应华 胡和田 周小坚 于 2019-09-16 设计创作，主要内容包括：本发明涉及一种液面动态整流光固化三维成形装置及方法,包括刚性框架,刚性框架上方设有顶板,刚性框架内设有液槽,液槽内设有光敏液态高分子物料,液槽的开口与顶板嵌合,顶板上设有一个升降平台,升降平台与成形基板连接并可控制其没入或升出液槽,成形基板上设有光固化三维成形体,所述液槽为环形液槽,液槽中央设有一个旋转驱动器,旋转驱动器与整流板连接,整流板沿着环形液槽径向设于液槽内,旋转驱动器可驱动整流板绕环形液槽中心旋转,线形成像元件位于整流板旋转方向后方。本发明结构合理、光固化三维成形效果好,易于在高性能、大幅面光固化三维成形装置中推广应用。(The invention relates to a liquid dynamic rectification photocuring three-dimensional forming device and a method, which comprises a rigid frame, wherein a top plate is arranged above the rigid frame, a liquid tank is arranged in the rigid frame, a photosensitive liquid high polymer material is arranged in the liquid tank, an opening of the liquid tank is embedded with the top plate, a lifting platform is arranged on the top plate, the lifting platform is connected with a forming substrate and can control the forming substrate to sink into or lift out of the liquid tank, a photocuring three-dimensional forming body is arranged on the forming substrate, the liquid tank is an annular liquid tank, a rotary driver is arranged at the center of the liquid tank and connected with a rectification plate, the rectification plate is radially arranged in the liquid tank along the annular liquid tank, the rotary driver can drive the rectification plate to rotate around the center. The invention has reasonable structure and good photocuring three-dimensional forming effect, and is easy to popularize and apply in high-performance and large-range photocuring three-dimensional forming devices.)

1. The utility model provides a three-dimensional forming device of liquid level developments rectification photocuring, including rigid frame (1), rigid frame (1) top is equipped with roof (2), be equipped with cistern (3) in rigid frame (1), be equipped with photosensitive liquid polymer material (4) in cistern (3), the opening and roof (2) gomphosis of cistern, be equipped with a lift platform (5) on roof (2), lift platform (5) are connected and steerable it is submerged or is gone up out cistern (3) with shaping base plate (6), be equipped with three-dimensional formed body of photocuring (7) on shaping base plate (6), characterized by: the liquid tank (3) is an annular liquid tank, a rotary driver (8) is arranged in the center of the liquid tank (3), the rotary driver (8) is connected with the rectifying plate (9), the rectifying plate (9) is radially arranged in the liquid tank (3) along the annular liquid tank, the rotary driver (8) can drive the rectifying plate (9) to rotate around the center of the annular liquid tank, and the linear imaging element (10) is located behind the rotating direction of the rectifying plate (9).

2. The liquid level dynamic rectification photocuring three-dimensional forming device according to claim 1, wherein: when the rectifying plate (9) rotates, the front side of the rectifying plate (9) is stacked to form a sensitive liquid polymer material liquid mass (201), the rear side of the rectifying plate (9) forms a rectifying liquid surface (202), and the linear imaging element (10) can project a linear optical pattern to a local liquid surface area which is close to the rear side surface of the rectifying plate (9) in the rotating direction.

3. the liquid level dynamic rectification photocuring three-dimensional forming device according to claim 1 or 2, wherein: the light curing controller (20) is respectively connected with the lifting platform (5), the rotary driver (8) and the linear imaging element (10).

4. A liquid level dynamic rectification photocuring three-dimensional forming method using the device of claim 1, characterized in that: the forming substrate (6) is provided with a cured product (11), the rotary driver (8) drives the rectifying plate (9) to dynamically rectify the upper liquid surface of the photosensitive liquid high polymer material (4) in the annular liquid tank (3), the rotary driver (8) drives the linear imaging element (10) to rotationally scan and photocure a local area of a rectified liquid surface (202) attached to the rear side surface of the rectifying plate (9), and a local cured product (12) generated by a scanned part of a current layer is attached to the surface of the cured product (11); at the edge of the partial cured object (12), a rotary driver (8) drives a linear imaging element (10) to continuously carry out line-by-line linear photocuring on an unscanned area, and a linear cured object (13) is formed on the surface of the cured object (11); the rotary driver (8) drives the linear imaging element (10) to continue rotating until the scanning photocuring of the whole scanning area of the cured product layer is completed, the linear cured products (13) are also attached to the edge of the local cured product (12) and are densely arranged and expanded to the whole scanning area along the rotating direction, and the formed cured product layer is completely attached to the surface of the cured product (11).

Technical Field

the invention relates to the field of three-dimensional printing, in particular to a liquid level dynamic rectification photocuring three-dimensional forming device and method.

background

The photocuring three-dimensional forming technology is based on a light-activated photosensitive resin curing reaction mechanism, adopts a point/line scanning imaging element or an area array imaging element to control an exposure area so as to obtain a sheet-shaped patterned single-layer cured substance, and realizes accumulation from the sheet-shaped single-layer cured substance to a three-dimensional cured formed body through continuous layer-by-layer exposure curing and interlayer interface bonding in a curing reaction process. The existing photocuring three-dimensional forming device is mainly divided into an upper liquid surface curing type and a lower liquid surface curing type. The upper liquid level curing refers to exposing the upper liquid level of the photosensitive resin in the liquid tank, the generated single-layer cured product is adhered to the surface of the forming substrate or the upper layer of the cured product, and the next layer of curing can be continuously performed only by sinking and immersing the layer of the cured product into the photosensitive resin in the liquid tank and forming a thin liquid layer after the photosensitive resin on the cured product is leveled. Although the single-layer cured product obtained by curing the upper liquid surface does not need to be peeled from a solid imaging interface, under the action of frequent flowing and viscous resistance of photosensitive resin, the flatness and the stability of the upper liquid surface are inferior to those of the lower liquid surface of a static liquid tank, so that the upper liquid surface cured forming body has low dimensional precision and large profile distortion, and is mainly used for large-size and low-precision photocuring occasions.

On the other hand, with the continuous expansion of additive manufacturing application scenes, the requirements on the forming efficiency, the precision, the size and the like of the light-cured three-dimensional forming device in the additive industry are higher and higher, which brings new technical challenges to the traditional lower liquid level and upper liquid level light-cured devices, and mainly comes from: firstly, when the lower liquid surface light curing device strips a single layer of cured material from the bottom of the liquid tank, the stripping force between the lower liquid surface light curing device and the bottom plane of the liquid tank is sharply increased along with the increase of the light curing area, so that stripping failure and stripping damage are easily caused, and the effective forming size of the lower liquid surface light curing device is difficult to further increase; secondly, the liquid level stability of the photosensitive resin liquid tank in the upper liquid level curing device still depends on a gravity leveling mechanism, and an active leveling means is lacked, so that the further improvement of the forming precision and the forming efficiency of the upper liquid level curing device is fundamentally hindered. In addition, the problems of short service life and complex replacement of the bottom film of the liquid tank of the lower liquid surface light curing device and the problems of difficult detection of the liquid level of the photosensitive resin and low control precision of the upper liquid surface light curing device are not effectively solved, and the factors further deteriorate the actual efficiency of the existing light curing three-dimensional forming device. At present, aiming at the urgent needs of further improving the forming size, precision, efficiency and use convenience of the photocuring three-dimensional forming device, a photocuring three-dimensional forming method which can actively control the liquid level form, does not need precise liquid level control, has low curing forming stress and low stripping force and even does not need stripping is also lacked.

Disclosure of Invention

The invention aims to solve the defects of the prior art and provides a liquid level dynamic rectifying photocuring three-dimensional forming device and method which can actively control the liquid level form, do not need precise liquid level control, have low curing forming stress and do not need stripping of cured products.

The invention adopts the technical scheme for solving the technical problems that: the liquid level dynamic rectification photocuring three-dimensional forming device comprises a rigid frame, wherein a top plate is arranged above the rigid frame, a liquid tank is arranged in the rigid frame, a photosensitive liquid polymer material is arranged in the liquid tank, an opening of the liquid tank is embedded with the top plate, a lifting platform is arranged on the top plate, the lifting platform is connected with a forming substrate and can control the forming substrate to sink into or lift out of the liquid tank, a photocuring three-dimensional forming body is arranged on the forming substrate, the liquid tank is an annular liquid tank, a rotary driver is arranged in the center of the liquid tank and connected with a rectification plate, the rectification plate is radially arranged in the liquid tank along the annular liquid tank, the rotary driver can drive the rectification plate to rotate around the center of the annular liquid.

Preferably, when the rectifying plate rotates, the front side of the rectifying plate is stacked to form a liquid mass of the liquid-sensitive polymer material, the rear side of the rectifying plate forms a rectifying liquid surface, and the linear imaging element can project the linear optical pattern to a local liquid surface area closely attached to the rear side surface of the rectifying plate in the rotating direction.

Preferably, the light curing controller is respectively connected with the lifting platform, the rotary driver and the linear imaging element.

A liquid level dynamic rectification photocuring three-dimensional forming method comprises the following steps: the forming substrate is provided with a cured product, the rotary driver drives the rectifying plate to dynamically rectify the upper liquid surface of the photosensitive liquid polymer material in the annular liquid tank, the rotary driver drives the linear imaging element to rotationally scan and photocure a local area of the rectifying liquid surface attached to the rear side surface of the rectifying plate, and the local cured product generated by the scanned part of the current layer is attached to the surface of the cured product; at the edge of the local cured object, the rotary driver drives the linear imaging element to continuously carry out linear photocuring line by line on an unscanned area, and a linear cured object is formed on the surface of the cured object; the linear imaging element is driven by the rotary driver to continuously rotate until the scanning photocuring of the whole scanning area of the layer is completed, the linear cured materials are tightly attached to the edge of the local cured materials and are densely arranged and expanded to the whole scanning area along the rotation direction, and the formed cured materials of the layer are completely attached to the surface of the cured materials.

more specifically:

Before the first layer of light curing is started, the light curing controller sends a closing instruction to the linear imaging element to close the optical pattern projection of the linear imaging element; firstly, injecting a proper amount of photosensitive liquid polymer material into the annular liquid tank to enable the static liquid level to be between the upper limit and the lower limit of the working liquid level of the rectifying plate; the photocuring controller sends a displacement instruction to the lifting platform, and the lifting platform is controlled to drive the forming substrate to be immersed into the photosensitive liquid polymer material in the liquid tank until the upper surface of the forming substrate is lower than the height corresponding to the rectifying liquid level single-layer curing thickness of the rectifying plate; the light curing controller transmits a rotation instruction to the rotation driver, and the rotation driver is controlled to drive the rectifying plate and the linear imaging element to rotate and position to the initial scanning angle position of the annular liquid tank.

When the first layer of light curing is carried out, the light curing controller sends a rotation instruction to the rotary driver, the rotary driver is controlled to drive the rectifying plate and the linear imaging element to rotate and accelerate to the rectifying speed, after the rotary driver reaches the rectifying speed, the photosensitive liquid high polymer material tightly attached to the local area behind the rectifying plate is stabilized at the rectifying liquid level, and the liquid level is flat and smooth; the photocuring controller sends a starting instruction to the linear imaging element, and refreshes linear pattern data of the first layer of photocuring pattern corresponding to the corner position to the linear imaging element according to the real-time angle position of the rotary driver; the linear optical pattern projected by the linear imaging element is projected on the rectifying liquid surface of a local area close to the rear part of the rectifying plate, the photocuring reaction of the photosensitive liquid high polymer material in the irradiated area is excited, and the generated linear cured material is adhered to the upper surface of the forming substrate; the linear imaging element is driven by the rotary driver to continuously scan the annular liquid tank for a circle, linear cured substances are densely arranged on the forming substrate line by line for a circle, and the formed sheet-shaped first-layer cured substances are adhered to the upper surface of the forming substrate; and the photocuring controller sends a closing instruction to the linear imaging element to close the optical pattern projection of the linear imaging element, and the photocuring of the first layer is finished.

When the subsequent layer of light curing is carried out, the light curing controller firstly sends a displacement instruction to the lifting platform, and the lifting platform is controlled to drive the forming substrate to descend by the height corresponding to the single-layer curing thickness; during the period, the light curing controller maintains the rotating speed of the rotary driver, the rotary driver drives the rectifying plate to rotate at a constant speed, and the photosensitive liquid polymer material liquid mass accumulated in front of the rectifying plate is sprayed to the rear of the rectifying plate through the lower surface of the rectifying plate, so that the liquid level of the local area tightly attached to the rear of the rectifying plate is quickly stabilized on the same rectifying liquid level as the previous layer; the photocuring controller sends a starting instruction to the linear imaging element, and refreshes the linear pattern data of the corresponding corner position of the photocuring pattern on the current layer to the linear imaging element according to the real-time angle position of the rotary driver; the linear imaging element projects the corresponding optical pattern onto the rectification liquid surface of the local area close to the rear part of the rectification plate, the photocuring reaction of the irradiated area is excited, the linear imaging element is driven by the rotary driver to continuously scan the annular liquid tank for a circle, and the formed cured object on the current layer is adhered to the surface of the cured object on the upper layer; and the photocuring controller sends a closing instruction to the linear imaging element, and the photocuring of the current layer is finished. The above processes are carried out layer by layer, and the single-layer condensate generated by the rotation scanning of the linear imaging element is accumulated layer by layer until a complete photocuring three-dimensional forming body is formed.

when the rotary driver drives the rectifying plate and the linear imaging element to synchronously rotate, the linear imaging element only exposes and solidifies a linear liquid level area which is close to the rear part of the rectifying plate, the flatness of the generated cured substance does not depend on the whole liquid level flatness of the annular liquid tank, the thickness of the generated cured substance does not depend on the whole liquid level height of the annular liquid tank, and the thickness of the generated cured substance is only related to the rectifying liquid level flatness and the rectifying liquid level height of a local area behind the rectifying plate; when the rotary driver drives the rectifying plate to rotate at a constant speed, under the action of fluid dynamics, the photosensitive liquid polymer material liquid mass accumulated in front of the rectifying plate is sprayed backwards through the lower surface of the rectifying plate to form a flat rectifying liquid surface; the rectification liquid level of the local area close to the rear part of the rectification plate is mainly determined by the lower surface height of the rectification plate and is irrelevant to the whole liquid level of the liquid tank.

When the linear imaging element and the rectifying plate synchronously rotate, the linear liquid level area close to the rear part of the rectifying plate is subjected to line-by-line scanning photocuring, so that the generated cured product has high flatness and high dimensional precision, the liquid level of the whole annular liquid tank does not need to be maintained flat, the liquid level does not need to be naturally leveled, and the photocuring three-dimensional forming efficiency is high; when the linear imaging element is subjected to single-layer photocuring, a single-layer cured substance is generated by line-by-line scanning exposure of linear patterns, and the single-layer cured substance is also generated by the close arrangement and progressive generation of the linear cured substances, so that the internal stress generated in the single-layer sheet-shaped cured substance by volume shrinkage during the curing reaction of the photosensitive liquid polymer material is small, and the stress deformation is also small.

The liquid level dynamic rectification photocuring three-dimensional forming method does not need to accurately control the whole liquid level of a photosensitive liquid polymer material, and has high photocuring forming dimensional precision and low manufacturing cost of a photocuring three-dimensional forming device; according to the liquid level dynamic rectification photocuring three-dimensional forming method, the liquid level is dynamically rectified by the rectification plate to ensure that the local liquid level of the linear exposure curing area is flat, liquid level leveling waiting time is not needed, forming efficiency is high, and the flatness of a cured product is superior to that of a gravity natural leveling mode; the invention has reasonable structure and good photocuring three-dimensional forming effect, and is easy to popularize and apply in high-performance and large-range photocuring three-dimensional forming devices.

Drawings

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

FIG. 2 is a cross-sectional view of the general construction of the present invention;

FIG. 3 is a side view of the present invention;

FIG. 4 is a schematic view of the liquid level dynamic rectification of the present invention;

FIG. 5 is a single layer progressive scan photocuring block diagram of the present invention;

FIG. 6 is a top view of a single layer progressive scan photocuring of the present invention;

FIG. 7 is a control signal connection diagram of the present invention;

Description of reference numerals: the device comprises a rigid frame 1, a top plate 2, a liquid tank 3, a photosensitive liquid polymer material 4, a lifting platform 5, a forming substrate 6, a photocuring three-dimensional forming body 7, a rotary driver 8, a rectifying plate 9, a linear imaging element 10, a cured object 11, a partial cured object 12, a photosensitive liquid polymer material liquid mass 201, a rectifying liquid surface 202 and a photocuring controller 20.

Detailed Description

the invention will be further described with reference to the accompanying drawings in which: