WO2022083086A1

WO2022083086A1 - Multi-station switching system based on under-mounted stereolithography technique, and stereolithography processing method

Info

Publication number: WO2022083086A1
Application number: PCT/CN2021/089205
Authority: WO
Inventors: 沈理达; 刘富玺; 吕非; 谢德巧; 焦晨; 晁龙; 邱明波; 赵剑峰
Original assignee: 南京航空航天大学
Priority date: 2020-10-22
Filing date: 2021-04-23
Publication date: 2022-04-28
Also published as: CN112590202A

Abstract

Disclosed are a multi-station switching system based on an under-mounted surface-exposure stereolithography technique, and a stereolithography processing method. The multi-station switching system comprises an upper forming layer, a middle multi-liquid-tank layer and a lower multi-station layer, wherein the forming layer is configured to rise and fall and switch to different stations by means of rotation; the multi-liquid-tank layer is configured to hold different types of liquid polymer materials; and the multi-station layer is configured to machine a formed part with different functions according to requirements. The present invention can achieve multi-material three-dimensional printing, and the optimization and modification of a formed part according to actual requirements. In addition, owing to the use of a rotary station structure, the system has a simple structure, space is effectively saved, the cost is reduced, the whole system is compact, and same has good application prospects in the fields of medical treatment and precision electronics.

Description

A kind of multi-station switching system based on bottom-mounted photocuring molding technology and photocuring molding processing method

technical field

The invention relates to a three-dimensional printing technology, in particular to a multi-position switching system and a light-curing molding processing method based on a bottom-mounted light-curing molding technology.

Background technique

Various types of wearable medical devices have a large number of potential applications and broad market demands in the fields of health monitoring, disease diagnosis, patient monitoring and disease rehabilitation. With the improvement of human's understanding of materials science, the new generation of key materials and their preparation and processing technologies in the future need to have composite (composite materials), functionalization (multifunctional materials), intelligence (combined with perception and response) and ecological environment. Friendly (renewable resource utilization, green) and other properties, and then meet the requirements for wearable medical devices.

In recent years, based on the concept of bionics and inspired by the characteristics of human skin, some research work has put forward the research direction of developing elastic electronic materials and devices with polymer materials as the core, so as to improve the fitting ability and measurement accuracy of the device and the human body. , for the development of a new generation of wearable sensor devices and devices. Due to the large use of liquid polymer materials, it is incompatible with traditional micromachining technology, which greatly increases the technical difficulty of preparing such devices. 3D printing technology can realize the macro-integrated manufacturing of medical devices and materials, and use the microstructure to control the mechanical properties of materials. performance, so as to meet the needs of close-fitting wear. At the same time, 3D printing technology also provides a closed-loop research mode of modeling, processing, testing and optimization. Through repeated iterations to improve the structural design, the wearing comfort and reliability of the processed medical equipment will be improved, and the research and development efficiency will be greatly improved. However, the traditional 3D printing technology is mostly suitable for single material, and the 3D printing technology for flexible materials is rarely used, so a new type of 3D printing technology for multi-material flexible polymer materials is needed.

SUMMARY OF THE INVENTION

Purpose of the invention: One purpose of the present invention is to provide a multi-station switching system based on the under-mounted photocuring molding technology, which solves the problem that conventional photocuring molding can only form one material and the function of the forming part is single, and the system of the present invention is efficient. The forming space is used effectively, the area is saved, the cost is reduced, and the whole system has a compact structure.

Another object of the present invention is to provide a photocuring molding processing method using the above-mentioned multi-station switching system.

Technical scheme: a multi-station switching system based on the bottom-mounted surface exposure photo-curing forming technology of the present invention, including the upper forming layer, the middle multi-tank layer and the lower multi-station layer, the forming layer, the multi-tank The layer and the multi-station layer are connected by mechanical parts in an upper, middle and lower step configuration. Among them, the forming layer is used to lift up and down and switch to different stations by rotating, and the multi-liquid tank layer is used to place different kinds of liquid polymer materials. The station layer is used to process the formed parts with different functions according to the requirements.

Preferably, the light source of the multi-station switching system is located below the liquid tank, and the forming layer is a bottom-mounted worktable, which realizes the up and down movement and rotation of the formed part.

Preferably, the multi-liquid tank layer includes a plurality of liquid tanks, each liquid tank holds different types of liquid photocurable materials, and the liquid tanks are switched by the rotation of the station to complete the photocuring forming of different materials.

Preferably, the photocurable material of the multi-liquid tank layer is a liquid polymer material added with ceramics, metal particles or fibers as a reinforcing phase, and the addition ratio of the reinforcing phase is not more than 15%.

Preferably, the multi-station layer includes a photo-curing forming station, a cleaning station, a drying station and a material compounding station. Each station is located on the same horizontal plane and placed in a ring shape. The curing and forming station is used to form parts, the cleaning station is used to clean the formed parts, the drying station is used to dry the formed parts, and the material compound station is used to realize functional device embedding and metal material splicing.

Preferably, the photo-curing forming station adopts the micro-focus lens offset exposure technology, the forming accuracy is 0.036mm, the forming efficiency is 1×106mm3/h, and the light source is ultraviolet light.

Preferably, the cleaning station adopts ultrasonic cleaning, and the cleaning time is 10-15s; the drying station adopts hot air drying, and the temperature is 20-30 °C.

A light curing molding processing method using the multi-position switching system of the present invention comprises the following steps:

(1) Establish a three-dimensional model of the multifunctional polymer material part to be processed in the modeling software, and partition the part area according to the required functions;

(2) Import the partitioned model into the slicing software for adding support, layered slicing, path planning, parameter selection, import the generated STL format file into the multi-station switching system, and the multi-station switching system selects according to the partition information The work station processes the components;

(3) When starting processing, the lower table is placed in the liquid tank A to form the material A, and the surface exposure system is irradiated from the bottom of the liquid tank according to the preset model to complete the forming of the material A. When the material B needs to be formed, The forming part rises with the lower table, and the station is switched and rotated to the cleaning and drying station, and then the formed part is cleaned and dried in turn, and then the formed part is lowered to the working height and placed in the liquid tank B for light curing and forming of the B material. , the surface exposure system irradiates from the bottom of the liquid tank according to the preset model to complete the forming of the B material; this cycle completes the forming of the entire part;

(4) After the forming process is completed, the forming parts are taken out for cleaning, drying to remove supports, etc., to obtain the final parts.

Beneficial effect: Compared with the prior art, the present invention has the following advantages:

(1) Multi-material additive manufacturing integrated forming through station switching solves the problem that traditional processing methods are difficult to process three-dimensional graphics inside the structure;

(2) The present invention utilizes the light curing forming technology to realize the integrated layered printing of the component matrix and the internal structure, and can print any complex three-dimensional multi-material model;

(3) The samples processed by the present invention can completely abandon complicated processes such as material splicing and device fusion, optimize processing steps, have simple process, no assembly, and short production cycle, and are especially suitable for product design and development and small batch production.

Description of drawings

Fig. 1 is the three-layer structure schematic diagram of the multi-station switching system of the present invention;

2 is a schematic plan view of the multi-station switching system of the present invention;

3 is a schematic diagram of the station switching process of the multi-station switching system of the present invention;

In the figure, 1. Under-mounted workbench for forming parts, 2. A material tank, 3. Surface exposure system, 4. Hot fan, 5. B material liquid tank, 6. Cleaning tank, 7. Composite processing platform.

Detailed ways

The present invention will be further described below with reference to the embodiments and the accompanying drawings, and the contents mentioned in the embodiments are not intended to limit the present invention. The following descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

The multi-station switching system based on the bottom-mounted photo-curing forming technology of the present invention includes an upper forming layer, a middle layer multi-liquid tank layer and a lower multi-station layer. The forming layer, the multi-liquid tank layer and the multi-station layer are in the The upper, middle and lower structures are connected by mechanical structures such as trusses and can be rotated. Among them, the forming layer can be lifted up and down and switched to different stations by rotating. The multi-liquid tank layer is used to place different kinds of liquid polymer materials. Layers are used to process shaped parts with different functions according to requirements. The light source of the multi-station system is located under the liquid tank, and the forming layer is a lower table, which can realize the up and down movement and rotation of the formed part; the multi-liquid tank layer includes multiple liquid tanks, and each liquid tank contains different kinds of liquids. Light-curing materials, through the rotation of the station to switch the liquid tank to complete the photo-curing forming of different materials; the multi-station layer includes a photo-curing forming station, a cleaning station, a drying station and a material compounding station, each station is located in The same horizontal plane is placed in a ring shape, and the station switching is completed by the rotation of the station; the light curing forming station is used to realize the forming of parts, the cleaning station is used to clean the formed part, and the drying station is used to clean the formed part. After drying, the material compounding station is used to realize functional device embedding and metal material splicing.

As shown in FIG. 1 , in the embodiment of the present invention, the lower-mounted worktable is used to drive the forming part to ascend, descend or rotate, and the multi-liquid tank layer includes the A material liquid tank and the B material liquid tank. The position is a surface exposure system, the cleaning station is a cleaning tank, the drying station is a hot fan, and the material compounding station is a composite processing platform. The light-cured material in the liquid tank of material A and material B is a liquid polymer material added with ceramics, metal particles or fibers as a reinforcing phase. The addition ratio of the reinforcing phase does not exceed 15%. There are three types of materials that can be used for multi-material forming. above. The photo-curing forming station adopts the micro-focus lens offset exposure technology, the forming accuracy is 0.036mm, the forming efficiency is 1×106mm3/h, and the light source is ultraviolet light. The cleaning station adopts ultrasonic cleaning, and the cleaning time is 10-15s; the drying station adopts hot air drying, and the temperature is 20-30 °C. The material composite station includes functions such as metal material splicing and functional device embedding.

The working principle of the multi-station switching system is: by zoning different materials in the model, the system switches to the corresponding station to complete the processing and forming of the corresponding material. When switching between different stations, configure the cleaning and drying steps, and in the corresponding The workbench completes the cleaning and drying process, and so on, so as to complete the multi-material composite.

The processing method of using the above-mentioned multi-station switching system to carry out photocuring molding specifically includes the following steps:

S1. Establish a three-dimensional model of the multifunctional polymer material part to be processed in the modeling software, and partition the part area according to the required functions;

S2. Import the partitioned model into the slicing software for adding support, layered slicing, path planning, parameter selection, import the generated STL format file into the multi-station switching system, and the multi-station switching system selects according to the partition information The parts are processed at the station, and after the processing of material A is completed, the steps of station switching, cleaning, drying, etc. are completed by editing the switching program, and the next material is processed and formed;

S3. When starting processing, the lower table is placed in the liquid tank where material A is added, and the surface exposure system irradiates from the bottom of the liquid tank according to the preset model to complete the forming of material A; when material B needs to be formed, according to the model material Partitioning, according to the preset switching station switching procedure, the forming part rises to the designated position with the lower table, the forming part is switched to the cleaning station and drying station at one time, and then the lower table is moved to the B material. In the liquid tank, the surface exposure system irradiates from the bottom of the liquid tank according to the preset model to complete the forming of the B material; this cycle completes the processing and forming of the entire part.

S4. After the forming process is finished, the forming parts are taken out for cleaning, drying to remove supports, etc., to obtain the final parts.

The processing method is further described below by taking the processing of wearable medical equipment as an example:

(1) Use the 3D modeling software in the computer to establish the 3D model of the wearable medical equipment to be processed, and save it as an STL file after the modeling is completed. The model STL file is divided according to the requirements that different material areas need to meet, and different processing methods are selected for different areas.

(2) Import the model STL file of the completed partition into the multi-station switching system, and the multi-station switching system selects the corresponding processing method according to the preset partition information, that is, the multi-station switching system selects the station pair according to the partition information. Parts are processed; the whole process is a multi-station switching system that can automatically switch stations to adjust the processing position.

(3) During the processing, materials such as ceramics, metal particles or fibers used to form the matrix by light curing in the liquid tank are used as liquid polymer materials for the reinforcing phase, and the addition ratio of the reinforcing phase does not exceed 15%. There are more than three types of materials. The surface exposure system adopts high-efficiency and high-precision array sub-pixel scanning large-size surface forming technology, and realizes high-efficiency and high-precision forming on the basis of micro-transmission array focusing technology.

(4) Figure 3 is a schematic diagram of the station switching process of the multi-station switching system. After forming a type of liquid polymer-based material, the liquid polymer-based material can continue to be formed or switched to another process according to actual needs. Before switching the liquid tank, it is necessary to clean and dry the formed part to prevent mutual contamination between the materials. This cycle is repeated to realize multi-material 3D printing. In addition, other stations such as functional device embedding and metal material splicing stations can be added according to actual needs, as shown in Figure 2, so that the prepared wearable sensor products can meet different needs.

(5) After taking out the processed component entity, after processing the surface, test whether each internal part can realize the corresponding function, and finally complete the processing and preparation of the wearable medical device.

To sum up, the present invention is a multi-station switching system based on the bottom-mounted photo-curing forming technology, adopts a three-layer rotating structure design, and is equipped with a multi-functional working platform. The scheme efficiently utilizes the forming space, and the design of the rotating structure saves the forming space and reduces the cost, and the entire system has a compact structure.

Claims

A multi-station switching system based on the bottom-mounted surface exposure photo-curing forming technology is characterized in that, it comprises an upper forming layer, a middle multi-liquid tank layer and a lower multi-station layer, the forming layer, the multi-liquid tank layer and the The multi-station layer is connected by mechanical parts in an upper, middle and lower step configuration. Among them, the forming layer is used to lift up and down and switch to different stations by rotation. The multi-liquid tank layer is used to place different kinds of liquid polymer materials. Layers are used to process shaped parts with different functions according to requirements.
The multi-station switching system based on the bottom-mounted surface exposure light curing forming technology according to claim 1, wherein the light source of the multi-station switching system is located under the liquid tank, and the forming layer is a bottom-mounted worktable, which realizes the formed part. up and down movement and rotation.
The multi-station switching system based on the bottom-mounted surface exposure photo-curing molding technology according to claim 1, wherein the multi-liquid tank layer includes a plurality of liquid tanks, and each liquid tank contains different types of liquid photo-curing. materials, through the rotation of the station to switch the liquid tank to complete the photo-curing molding of different materials.
The multi-station switching system based on the bottom-mounted surface exposure photo-curing forming technology according to claim 3, wherein the photo-curing material of the multi-liquid tank layer is a liquid polymer material added with ceramics, metal particles or fibers as a reinforcing phase , the addition ratio of strengthening phase does not exceed 15%.
The multi-station switching system based on the bottom-mounted surface exposure photo-curing forming technology according to claim 1, wherein the multi-station layer comprises a photo-curing forming station, a cleaning station, a drying station and a material compounding station Each station is located on the same horizontal plane and placed in a ring shape. The station switching is completed by the rotation of the station. The photo-curing forming station is used to realize the forming of parts, the cleaning station is used to clean the formed parts, and the drying station It is used to dry the formed parts, and the material compounding station is used to realize functional device embedding and metal material splicing.
The multi-station switching system based on the bottom-mounted surface exposure photo-curing forming technology according to claim 5, wherein the photo-curing forming station adopts the micro-focus lens offset exposure technology, the forming accuracy is 0.036mm, and the forming efficiency is 1× 106mm3/h, the light source is ultraviolet light.
The multi-station switching system based on the bottom-mounted surface exposure light curing forming technology according to claim 5, wherein the cleaning station adopts ultrasonic cleaning, and the cleaning time is 10-15s; the drying station adopts hot air drying, and the temperature 20-30℃.
A photocuring molding processing method using the multi-station switching system described in any one of claims 1-7, characterized in that, comprising the following steps:

(1) Establish a three-dimensional model of the multifunctional polymer material part to be processed in the modeling software, and partition the part area according to the required functions;

(2) Import the partitioned model into the slicing software for adding support, layered slicing, path planning, parameter selection, import the generated STL format file into the multi-station switching system, and the multi-station switching system selects according to the partition information The work station processes the components;

(3) When starting processing, the lower table is placed in the liquid tank A to form the material A, and the surface exposure system is irradiated from the bottom of the liquid tank according to the preset model to complete the forming of the material A. When the material B needs to be formed, The forming part rises with the lower table, and the station is switched and rotated to the cleaning and drying station, and then the formed part is cleaned and dried in turn, and then the formed part is lowered to the working height and placed in the liquid tank B for light curing and forming of the B material. , the surface exposure system irradiates from the bottom of the liquid tank according to the preset model to complete the forming of the B material; this cycle completes the forming of the entire part;

(4) After the forming process, the forming parts are taken out for cleaning and drying to remove the support to obtain the final parts.