CN210880912U

CN210880912U - High-frequency shearing photocuring three-dimensional forming device

Info

Publication number: CN210880912U
Application number: CN201921380636.8U
Authority: CN
Inventors: 俞红祥; 王康恒; 应华
Original assignee: Hangzhou Dedi Intelligent Technology Co ltd
Current assignee: Hangzhou Dedi Intelligent Technology Co ltd
Priority date: 2019-08-23
Filing date: 2019-08-23
Publication date: 2020-06-30
Anticipated expiration: 2029-08-23

Abstract

The utility model relates to a three-dimensional forming device of high-frequency shearing photocuring, including the rigid frame, be equipped with the cistern in the rigid frame, the opening of cistern and the roof gomphosis of rigid frame, be equipped with Z to sharp module on the roof of rigid frame, Z is connected with the forming substrate to the moving platform of sharp module, can drive the vertical removal of forming substrate in the cistern and fix a position, rigid frame bottom is equipped with the imaging element that can project optical pattern to the transparent bottom of cistern, rigid frame bottom is equipped with flexible guide, flexible guide's moving platform is connected bottom the cistern, the rigid frame medial surface has the high-frequency oscillator, the high-frequency oscillator is connected with cistern bottom side. The utility model discloses simple structure, with low costs, can effectively solve the cured substance and the bonding problem of cistern bottom plane.

Description

High-frequency shearing photocuring three-dimensional forming device

Technical Field

The utility model belongs to the technical field of three-dimensional the printing and specifically relates to a three-dimensional forming device of high frequency shearing photocuring.

Background

Compared with the technologies such as melt extrusion molding (FDM), laser selective sintering (SLS) and the like, the photocuring three-dimensional forming technology not only has smooth forming surface and high forming speed, but also has simple equipment structure and low manufacturing cost, and has important position in the field of additive manufacturing. Among the photocuring three-dimensional forming devices with various structural forms, the lower liquid surface photocuring device is one of the most widely applied types, namely, an optical pattern penetrates through a transparent bottom of a photosensitive resin liquid tank, a single-layer cured substance is generated by exposing the lower liquid surface, and the cured substance is moved upwards and is cured layer by layer until a complete three-dimensional body is formed. Because the generation of the cured material occurs at the bottom of the photosensitive resin liquid tank, the formed part grows upwards from the bottom of the liquid tank layer by layer, and as long as the photosensitive resin in the liquid tank is not exhausted, even if the formed part exposes out of the upper liquid level of the photosensitive resin, the lower liquid level photocuring can be continued, so that the method has the outstanding advantage that the height of the formed part is not limited by the depth of the liquid tank, and meanwhile, the flatness of the cured material generated at the bottom of the liquid tank is not influenced by the fluctuation of the upper liquid level of the photosensitive resin.

On the other hand, when the photosensitive resin on the bottom plane of the liquid tank is exposed and cured, the generated single-layer cured material naturally adheres to the bottom plane of the liquid tank and the forming substrate or the cured material, so as to form two solid-solid bonding interfaces, wherein the solid-solid bonding interface between the single-layer cured material and the forming substrate or the cured material is a necessary condition for the single-layer cured material to accumulate layer by layer to form a three-dimensional formed body and ensure the structural strength of the formed body; the solid-solid bonding interface between the single-layer cured material and the bottom plane of the liquid tank is a factor which prevents the photosensitive resin from flowing and filling between the cured material and the bottom plane of the liquid tank so as to continue the next layer of photo-curing and be broken. How to peel off a single-layer cured product from the bottom of a liquid tank without damaging the single-layer cured product and the bonding strength between the single-layer cured product and a cured product or a formed substrate are always main problems faced by a lower liquid-level photocuring device, which is particularly prominent when forming fine and complex-section parts. The existing liquid surface photocuring equipment can be divided into three types of modes of stripping a cured substance from the bottom of a liquid tank: rigid forcible peeling, flexible film peeling and peeling-free. The rigid forced stripping means that the cured material is forcibly pulled away from the rigid bottom plane of the liquid tank by mechanical tension, the stripping speed is high, but the stripping force and the stripping damage are also maximum; the flexible membrane stripping means that the flexible membrane is adopted at the bottom of the liquid tank, when the cured material is pulled away from the plane of the bottom of the liquid tank by mechanical force, the flexible membrane is elastically deformed, so that a stripping area is gradually diffused to a complete section from the outer edge of the cured material, the stripping force is reduced to a certain extent relative to rigid forcible stripping, the stripping damage is reduced, but the stripping speed is greatly reduced, and the flexible membrane stripping is the most common stripping mode; the stripping-free method is characterized in that a layer of special lyophobic structure or coating is added on the surface layer of the bottom plane of the liquid tank, so that the bottom of the liquid tank is prevented from being bonded with a cured material in the photocuring reaction process, and the cured material is not required to be mechanically stripped from the bottom plane of the liquid tank after the photocuring reaction, so that the photocuring three-dimensional forming efficiency is remarkably improved, but the method has the limitations of few types of matched photosensitive resin, high cost of the bottom plane of the liquid tank, short service life and the. At present, in the field of photocuring three-dimensional forming, aiming at the requirements of further improving the forming precision and efficiency of lower liquid surface photocuring equipment, a photocuring three-dimensional forming method which is simple in structure, low in cost and capable of effectively solving the problem of bonding of a cured product and a liquid tank bottom plane is lacked.

SUMMERY OF THE UTILITY MODEL

The utility model discloses solve above-mentioned prior art's shortcoming, provide a simple structure, with low costs, can effectively solve the high frequency shearing photocuring three-dimensional forming device of condensate and cistern bottom plane bonding problem.

The utility model provides a technical scheme that its technical problem adopted: the high-frequency shearing photocuring three-dimensional forming device comprises a rigid frame, wherein a liquid tank is arranged in the rigid frame, an opening of the liquid tank is embedded with a top plate of the rigid frame, a Z-direction linear module is arranged on the top plate of the rigid frame, a moving platform of the Z-direction linear module is connected with a forming substrate, the forming substrate can be driven to vertically move and be positioned in the liquid tank, an imaging element capable of projecting an optical pattern to the transparent bottom of the liquid tank is arranged at the bottom of the rigid frame, an elastic guide rail is arranged at the bottom of the rigid frame, the moving platform of the elastic guide rail is connected with the bottom of the liquid tank, a high-frequency oscillator is arranged on.

Preferably, a rigid tank frame is arranged above the tank, a rigid transparent bottom is arranged at the bottom of the tank, the rigid tank frame and the rigid transparent bottom are connected through a flexible connecting section, an upper opening of the rigid tank frame is embedded with the top plate, the rigid transparent bottom is connected with the elastic guide rail, and a side surface of the rigid transparent bottom is connected with the actuating rod of the high-frequency oscillator.

Preferably, the photocuring controller is connected with the high-frequency oscillator, the imaging element and the Z-direction linear module respectively.

A high-frequency shearing photocuring three-dimensional forming method comprises the following steps: when the front layer photocuring starts, the Z-direction linear module drives the forming substrate to vertically move, so that the thickness of a cured object on the lower surface of the forming substrate and the thickness of a photosensitive high polymer material liquid layer at a gap of the rigid transparent bottom is a single-layer curing thickness; the high-frequency vibrator drives the rigid transparent bottom to do continuous high-frequency reciprocating motion between the left limit position and the right limit position, so that high-frequency shearing motion is maintained between the rigid transparent bottom and the lower liquid surface of the photosensitive high polymer material; the imaging element emits an optical pattern and penetrates through the rigid transparent bottom to expose the photosensitive high polymer material liquid layer, and the obtained single-layer condensate also keeps high-frequency shearing motion with the rigid transparent bottom in the generation process, so that the single-layer condensate cannot be adhered to the rigid transparent bottom and only adheres to the lower surface of a condensate which is relatively static with the rigid transparent bottom; after the exposure is finished, the imaging element closes the optical pattern projection, and the photocuring of the current layer is finished.

More specifically:

before the light curing is started, the light curing controller sends a light source closing signal to the imaging element and controls the imaging element to keep an optical image closing state; injecting a photosensitive liquid polymer material into the liquid tank, sending a motion signal to the Z-direction linear module by the photocuring controller, and controlling the Z-direction linear module to drive the forming substrate to be immersed into the photosensitive liquid polymer material in the liquid tank until a gap between the lower surface of the forming substrate and the rigid transparent bottom of the liquid tank is in a single-layer curing thickness; and the photocuring controller sends a vibration signal to the high-frequency oscillator, controls the high-frequency oscillator to drive the rigid transparent bottom of the liquid tank to perform small-amplitude transverse high-frequency reciprocating motion, and maintains the small-amplitude transverse high-frequency reciprocating motion of the rigid transparent bottom of the liquid tank before the photocuring three-dimensional forming is finished.

When the first layer of light curing is carried out, the light curing controller sends first layer of slice pattern data to the imaging element, the imaging element is controlled to turn on the light source to project an optical pattern onto the rigid transparent bottom of the liquid tank, and the optical pattern further penetrates through the rigid transparent bottom and then acts on the photosensitive liquid polymer material between the photosensitive liquid polymer material and the lower surface seam of the forming substrate to trigger the light curing reaction of the bright area of the optical pattern; during the photocuring reaction, as the cured materials are gradually generated, good bonding conditions are provided between the cured materials and the static forming substrate, and the transverse high-frequency reciprocating motion of the rigid transparent bottom of the liquid tank and the high-frequency shearing motion are formed between the cured materials, so that the bonding conditions of the cured materials and the rigid transparent bottom of the liquid tank are destroyed, and the cured materials can be prevented from being adhered to the rigid transparent bottom of the liquid tank; after the exposure time is set, the light curing controller sends out a light source closing signal to the imaging element to control the imaging element to close the projection of the optical pattern, and the generated first layer of cured material is only adhered to the lower surface of the forming substrate.

Before the subsequent layer of light curing is carried out, the light curing controller firstly sends a displacement signal to the Z-direction linear module, the Z-direction linear module is controlled to drive the forming substrate to move upwards for single-layer curing thickness, so that a gap between the lower surface of the upper layer of cured material and the rigid transparent bottom of the liquid tank is the single-layer curing thickness, and under the suction action of negative pressure generated by the upward movement of the upper layer of cured material, the photosensitive liquid polymer material in the liquid tank flows and is filled into the gap; the photocuring controller sends current layer slice pattern data to the imaging element, the imaging element is controlled to turn on the light source to project the optical pattern onto the rigid transparent bottom of the liquid tank, and the light-sensitive liquid high polymer material in the bright area of the optical pattern is initiated to carry out photocuring reaction; and after the light curing controller maintains the set exposure time, controlling the imaging element to close the optical pattern projection to terminate the exposure process of the current layer, wherein the generated cured object of the current layer is only adhered to the lower surface of the cured object of the previous layer. The single-layer photocuring process is implemented layer by layer, and the single-layer cured substance generated by each exposure and the previous layer of cured substance are accumulated layer by layer until a complete photocuring three-dimensional forming body is formed.

The liquid tank of the utility model comprises a rigid liquid tank frame, a flexible connecting section and a rigid transparent bottom. The rigid liquid tank frame is a liquid tank main body and provides a space for accommodating the photosensitive liquid polymer material, and an upper opening of the rigid liquid tank frame is embedded on a top plate of the rigid frame; the rigid transparent bottom seals the bottom of the liquid tank to form a flat lower liquid level of the photosensitive liquid polymer material on the upper surface of the liquid tank and provide a light-transmitting channel for photocuring the lower liquid level; the rigid liquid tank frame and the rigid transparent bottom are connected by the flexible connecting section, so that a complete open liquid tank structure is formed, and the rigid connection between the rigid transparent bottom and the rigid liquid tank frame is avoided.

The rigid transparent bottom of the liquid tank is supported at the bottom of the rigid frame by adopting an elastic guide rail, and the side surface of the rigid transparent bottom is driven by adopting a high-frequency vibrator so as to generate high-frequency shearing motion between the rigid transparent bottom and the lower liquid level; the utility model discloses a when the high frequency shearing motion is done to the transparent end of rigidity, its supporting mechanism is elastic guide promptly and does not have frictional force in the direction of motion, and the loss of motion energy is little, and the range of motion is high with the frequency stability. When the rigid transparent bottom of the liquid tank of the utility model does high-frequency shearing movement, the energy transmitted to the rigid liquid tank frame through the flexible connecting section is less, and the high-frequency positive impact of the inner wall of the rigid liquid tank frame on the photosensitive liquid polymer material is less; the utility model discloses the photosensitive liquid polymer material of liquid level only takes place the high frequency shearing motion under rigid transparent end and the cistern, and no high frequency openly strikes, can not produce the supersound vacuole at the liquid level down, and then reduces the cured product density, or damage rigid transparent basal surface, reduce its light transmission performance.

The utility model breaks the stable bonding condition between the condensate and the bottom plane of the liquid tank in the light curing process through the high-frequency shearing movement between the rigid transparent bottom of the liquid tank and the lower liquid level of the photosensitive liquid polymer material, so that the condensate is only adhered to the lower surface of the forming substrate or the condensate on the upper layer without being stripped from the bottom plane of the liquid tank; the utility model discloses when the shaping base plate moves up, the transparent end of cistern rigidity does not have obvious deformation, and its and shaping base plate or its lower surface attached cured object gap between level and evenly, the negative pressure is big, and the speed that photosensitive liquid polymer material flowed the packing in to the gap is fast. The utility model discloses a three-dimensional forming method of high frequency shearing photocuring, photocuring shaping is efficient, the cured object levels and does not have the damage of peeling off, easily popularizes and applies in high accuracy, high efficiency photocuring three-dimensional forming equipment.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a perspective view of the overall structure of the present invention and a partially enlarged view thereof;

FIG. 3 is a schematic view of the rigid transparent bottom support and driving structure of the liquid tank of the present invention;

FIG. 4 is a schematic view of a single layer photocured elevated forming substrate of the present invention;

FIG. 5 is a schematic view of the single layer photocuring high frequency shear

Fig. 6 is a control signal connection diagram of the present invention.

Description of reference numerals: the device comprises a rigid frame 1, a liquid tank 2, a rigid liquid tank frame 201, a flexible connecting section 202, a rigid transparent bottom 203, a photosensitive polymer material 3, a top plate 4, an elastic guide rail 5, a high-frequency vibrator 6, an actuating rod 601, an imaging element 7, a Z-direction linear module 8, a forming substrate 9, a three-dimensional forming body 10, a cured product 11, a photosensitive polymer material liquid layer 12, a left limit position 13, a right limit position 14, a lower liquid level 15, a single-layer cured product 16 and a photocuring controller 20.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

example (b):

a high-frequency shearing photocuring three-dimensional forming device is shown in figures 1 and 2, a rigid frame 1 is internally provided with a liquid tank 2, a photosensitive high polymer material 3 is arranged in the liquid tank 2, and an opening of the liquid tank 2 is embedded on a top plate 4 of the rigid frame 1; the bottom of the rigid frame 1 is provided with an elastic guide rail 5, and a moving platform of the elastic guide rail 5 is connected with the bottom of the liquid tank 2; the inner side surface of the rigid frame 1 is provided with a high-frequency vibrator 6, and an actuating rod of the high-frequency vibrator 6 is connected with the side edge of the bottom of the liquid tank 2; the bottom of the rigid frame 1 is provided with an imaging element 7, the imaging element 7 can project an optical pattern to the bottom of the liquid tank 2, and the optical pattern exposes the photosensitive high polymer material 3 on the liquid level of the liquid tank 2 after penetrating the bottom of the liquid tank 2; the Z-direction linear module 8 is vertically fixed on the top plate 4 of the rigid frame 1, and a moving platform of the Z-direction linear module 8 is connected with the forming substrate 9; the Z-direction linear module 8 can drive the forming substrate 9 to move vertically and position, so as to press the forming substrate 9 to the bottom of the liquid tank 2 at the beginning of photocuring, move the forming substrate 9 up layer by layer during photocuring, and lift the three-dimensional forming body 10 on the lower surface of the forming substrate 9 out of the liquid tank 2 after photocuring.

As shown in fig. 3, the liquid tank 2 is composed of a rigid liquid tank frame 201, a flexible connecting section 202 and a rigid transparent bottom 203 from top to bottom in sequence, the upper opening of the rigid liquid tank frame 201 is embedded on the top plate 4 of the rigid frame 1, and the flexible connecting section 202 connects the lower opening of the rigid liquid tank frame 201 with the rigid transparent bottom 203 to form the complete open liquid tank 2; the rigid transparent bottom 203 is vertically supported at the bottom of the rigid frame 1 by an elastic guide rail 5, and the side surface of the rigid transparent bottom 203 is connected with an actuating rod 601 of the high-frequency vibrator 6; the base of the high-frequency vibrator 6 is fixed on the inner side surface of the rigid frame 1, and the high-frequency vibrator 6 can drive the rigid transparent bottom 203 to do transverse high-frequency reciprocating motion in the guide direction of the elastic guide rail 5;

as shown in fig. 6, the light curing controller 20 is connected to the high-frequency oscillator 6, the light curing controller 20 is connected to the imaging element 7, and the light controller 20 is connected to the Z-direction linear module 8; the photocuring controller 20 sends an electric signal to the high-frequency vibrator 6 to control the high-frequency vibrator 6 to drive the rigid transparent bottom 203 of the liquid tank 2 to do transverse high-frequency reciprocating motion; the light curing controller 20 sends an electric signal to the imaging element 7, and controls the imaging element 7 to project an optical pattern onto the rigid transparent bottom 203 of the liquid tank 2 in the light curing process, so as to expose the photosensitive high polymer material 3 on the liquid level below the liquid tank 2; the light curing controller 20 sends an electric signal to the Z-direction linear module 8 to control the Z-direction linear module 8 to drive the forming substrate 9 to perform vertical positioning movement, so as to adjust the gap distance between the forming substrate 9 or the cured object 11 attached to the lower surface of the forming substrate and the rigid transparent bottom 203 of the liquid tank 2, thereby obtaining a single-layer cured object 16 with controllable thickness.

A high-frequency shearing photocuring three-dimensional forming method, as shown in figure 4, when the photocuring of a front layer starts, a Z-direction linear module 8 drives a forming substrate 9 to vertically move, so that a cured object 11 on the lower surface of the forming substrate 9 and a photosensitive polymer material liquid layer 12 at a gap of a rigid transparent bottom 203 are enabled to have a single-layer curing thickness; as shown in fig. 5, the high-frequency oscillator 6 drives the rigid transparent bottom 203 to make continuous high-frequency reciprocating motion between the left limit position 13 and the right limit position 14, so that high-frequency shearing motion is maintained between the rigid transparent bottom 203 and the lower liquid level 15 of the photosensitive polymer material 3; the imaging element 7 emits an optical pattern and penetrates through the rigid transparent bottom 203 to expose the photosensitive polymer material liquid layer 12, and the obtained single-layer cured object 16 also keeps high-frequency shearing motion with the rigid transparent bottom 203 in the production process, so that the single-layer cured object 16 cannot be adhered to the rigid transparent bottom 203 and only adheres to the lower surface of the cured object 11 which is relatively static; after the exposure is completed, the imaging element 7 turns off the optical pattern projection and the photocuring of the current layer is finished.

The utility model discloses a three-dimensional forming method of high frequency shearing photocuring adopts mechanical shearing motion to avoid the adhesion of the single-layer cured object that the liquid level generated under the cistern to the cistern bottom plane, and then cancels the technological process that the single-layer cured object is peeled off from the cistern bottom plane, when eliminating to peel off, not only the three-dimensional forming efficiency of photocuring is high, but also the single-layer cured object is level and smooth, does not have the peeling damage; the utility model discloses need not to do lyophobic surface treatment to cistern bottom plane, also do not rely on special photosensitive liquid polymer material formula, not only cistern long service life, photocuring consumptive material are with low costs, and it is convenient that cistern cleaning maintenance and photocuring consumptive material change moreover.

The high-frequency vibrator of the utility model can adopt high-frequency vibration elements with different excitation energy types, such as piezoelectric vibrators, electromagnetic vibrators, pneumatic vibrators and the like; the utility model discloses the transparent end of rigidity of cistern removes the elastic guide of this embodiment and supports, does to adopt other low friction guide elements, like magnetic suspension guide rail, air supporting guide rail, hydrostatic pressure guide rail etc..

In addition to the above embodiments, the present invention may have other embodiments. All the technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope claimed by the present invention.

Claims

1. The utility model provides a three-dimensional forming device of high-frequency shear photocuring, including rigid frame (1), be equipped with cistern (2) in rigid frame (1), the opening of cistern (2) and roof (4) gomphosis of rigid frame (1), be equipped with Z on roof (4) of rigid frame (1) to sharp module (8), the moving platform and the shaping base plate (9) of Z to sharp module (8) are connected, can drive shaping base plate (9) vertical movement and location in cistern (2), rigid frame (1) bottom is equipped with imaging element (7) that can project optical pattern liquid cistern (2) transparent bottom, characterized by: the bottom of the rigid frame (1) is provided with an elastic guide rail (5), a moving platform of the elastic guide rail (5) is connected with the bottom of the liquid tank (2), the inner side surface of the rigid frame (1) is provided with a high-frequency vibrator (6), and the high-frequency vibrator (6) is connected with the side edge of the bottom of the liquid tank (2).

2. The high-frequency shearing photocuring three-dimensional forming device as defined in claim 1, wherein: a rigid liquid tank frame (201) is arranged above the liquid tank (2), a rigid transparent bottom (203) is arranged at the bottom of the liquid tank, the rigid liquid tank frame (201) is connected with the rigid transparent bottom (203) through a flexible connecting section (202), the upper opening of the rigid liquid tank frame (201) is embedded with the top plate (4), the rigid transparent bottom (203) is connected with the elastic guide rail (5), and the side surface of the rigid transparent bottom (203) is connected with an actuating rod (601) of the high-frequency vibrator (6).

3. The high frequency shear photocuring three-dimensional forming apparatus as defined in claim 1 or 2, wherein: the photocuring controller (20) is respectively connected with the high-frequency oscillator (6), the imaging element (7) and the Z-direction linear module (8).

4. The high frequency shear photocuring three-dimensional forming apparatus as defined in claim 1 or 2, wherein: the elastic guide rail (5) can be replaced by a magnetic suspension guide rail, an air floatation guide rail and a hydrostatic pressure guide rail.