WO2019000966A1

WO2019000966A1 - Method for controlled cold deposition 3d printing facing peek material

Info

Publication number: WO2019000966A1
Application number: PCT/CN2018/076200
Authority: WO
Inventors: 杨春成; 曹毅; 石长全; 李涤尘
Original assignee: 陕西聚高增材智造科技发展有限公司
Priority date: 2017-06-26
Filing date: 2018-02-11
Publication date: 2019-01-03
Also published as: CN107160676A; CN107160676B

Abstract

A method for controlled cold deposition 3D printing facing a polyetheretherketone (PEEK) material: first forming a desired stable global temperature field in a 3D printer inner working cavity (2); next forming a real-time, controllable local quick cooling field near a 3D printing head (5); 3D printing a PEEK material (11) such that the PEEK material (11) experiences different cooling rates and steady-state temperatures during extrusion, thereby forming different crystallinities at said locations; or controlling the moving speed and printing path of the 3D printing head (5) that has been heated to a high temperature within the area so as to form a PEEK material (11) having different crystallinities in different printing areas; finally, directly using a PEEK part (13) or performing corresponding heat treatment according to requirements. A PEEK part having different crystallinities and different performances is printed by means of the 3D printing method of using global temperature control, local quick cooling and local printing processing parameter variation, thereby meeting different application requirements, while processing is simple.

Description

Controlled cold deposition 3D printing method for PEEK materials

[0001] The present invention relates to the field of 3D printing technology, and in particular to a controlled cold deposition 3D printing method for PEEK materials.

Background technique

[0002] Polyether-ether-ketone (PEEK) is one of the most recognized thermoplastics, and it has excellent mechanical properties, heat resistance, abrasion resistance and chemical resistance. Water resistance, heat aging resistance, fatigue resistance, creep resistance, radiation resistance and weather resistance have been used as a potential high-performance lightweight material to replace metal materials in various fields. In particular, its excellent biocompatibility and anti-wear properties make it one of the ideal materials for bioprosthetic implants.

[0003] fused deposition 3D printing technology is a fully digitally driven macro/micro-structure integrated manufacturing process with the advantages of single-piece small-volume customization and rapid manufacturing. The use of fused deposition 3D printing technology to manufacture PEEK parts has become a field. In the hot direction, there are also a small number of PEEK fused deposition 3D printers on the market.

[0004] However, unlike traditional 3D printing materials such as ABS and PLA materials, PEEK material is a semi-crystalline thermoplastic material, and a certain proportion of crystalline regions and amorphous regions exist in the solid polymer material. The number of states can be expressed by crystallinity. Therefore, in the process of melt extrusion and solidification deposition of PEEK materials, there are processes of crystal melting and crystallization in the crystalline region, even the process of recrystallization, and the change of crystallization not only changes the shrinkage of the material deposition process, but also affects the material. The molecular level of the connection, which in turn greatly affects the deposition effect and material properties after deposition. According to polymer physics and polymer crystallization kinetics, in the 3D printing process, the global temperature environment of 3D printing and the local temperature environment near the 3D print head will greatly affect the crystallization rate and crystallization temperature of the extruded deposition of PEEK material. , thereby affecting the crystallinity of the PEEK material after forming. However, the 3D printing method for PEEK materials on the market has not considered the crystallinity of the PEEK material after forming, and has not proposed a corresponding method to control the crystallinity of the PE EK material, thereby obtaining PEEK parts with different properties. technical problem

[0005] In order to overcome the disadvantages of the prior art described above, it is an object of the present invention to provide a controlled cold deposition 3D printing method for PEEK materials, which uses global temperature control, local rapid cooling, and partial printing process parameter change 3D printing. The method prints PEEK parts with different crystallinity and different properties to meet different application requirements.

Problem solution

Technical solution

In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A controlled cold deposition 3D printing method for PEEK materials, comprising the following steps:

[0008] 1) using the overall temperature control system 1 to integrally heat the working cavity 2 of the 3D printer, and using the air circulation system 3 to circulate the internal airflow of the working cavity 2 of the 3D printer, under the heat preservation effect of the thermal insulation system 4, Making the 3D printer working cavity 2 form a desired stable global temperature field;

[0009] 2) then using the local temperature measurement system 6 and the local cooling system 7 on the 3D print head 5, together with the local temperature disperser 8, forming a solid, controllable local velocity field near the 3D print head 5, The local cooling system 7 employs an air-cooled, liquid-cooled or semiconductor cooling method;

[0010] 3) the system controller 9 according to the set model data, the control of the motion system 10 to drive the 3D print head 5 according to the model information to move and extrude the PEEK material 11;

[0011] The peer system controller 9 adjusts the temperature and distribution of the local temperature field according to the required crystallinity information set in each design, so that the PEEK material 11 undergoes different cooling rates and stability after extrusion. a temperature at which a different degree of crystallinity is formed;

[0012] Or the system controller 9 controls the moving speed and the printing path of the 3D print head 5 that has been heated to a high temperature in this area according to the required crystallinity information set in each design: the faster the moving speed The longer the printing path, the shorter the time during which the 3D print head 5 that has been heated to a high temperature stays in this area, the less temperature accumulated here, the faster the extruded PEEK material 11 cools down, and the smaller the crystallinity formed. The slower the moving speed, the shorter the printing path, the longer the 3D print head 5 that has been heated to a high temperature stays in this area, and the more temperature accumulated here, the slower the temperature of the extruded PEEK material 11 is formed. The greater the degree of crystallinity, the formation of PEEK materials of different crystallinity in different printing areas;

[0013] 4) Finally, PEEK parts 13 having different crystallinity at different positions are obtained on the printed substrate 12, PEEK The part 13 is used directly or subjected to a corresponding heat treatment as required.

Advantageous effects of the invention

Beneficial effect

[0014] The present invention prints PEEK material parts of different crystallinity in different regions by controlling global, local temperature field and related 3D printing process (printing speed, printing path) under the requirements of model design. Different performances for different application requirements, the process is simple.

Brief description of the drawing

DRAWINGS

1 is a schematic view of printing of the present invention.

2 is a schematic diagram of the present invention for controlling the crystallinity of a PEEK material using 3D printing process parameters.

Embodiments of the invention

[0017] The present invention will be further described in detail below with reference to the accompanying drawings.

[0018] A controlled cold deposition 3D printing method for PEEK materials, comprising the following steps:

[0019] 1) Referring to FIG. 1, the overall temperature control system 1 is used to integrally heat the working cavity 2 of the 3D printer, and the air circulation system 3 is used to circulate the internal airflow of the working cavity 2 of the 3D printer, in the thermal insulation system 4 Under the effect of heat preservation, the 3D printer working cavity 2 forms a desired stable global temperature field;

[0020] 2) then using the local temperature measurement system 6 and the local cooling system 7 on the 3D print head 5, in conjunction with the local temperature disperser 8, forming a solid, controllable local velocity field near the 3D printhead 5, The local cooling system 7 employs an air-cooled, liquid-cooled or semiconductor cooling method;

[0021] 3) the system controller 9 according to the set model data, the control of the motion system 10 to drive the 3D print head 5 according to the model information to move and extrude the PEEK material 11;

[0022] The same system controller 9 adjusts the temperature and distribution of the local temperature field according to the required crystallinity information set in each design, so that the PEEK material 11 undergoes different cooling rates and stability after extrusion. a temperature at which a different degree of crystallinity is formed;

[0023] Or the system controller 9 controls the moving speed and the printing path of the 3D print head 5 that has been heated to a high temperature in this area according to the required crystallinity information set in each design: Referring to FIG. 2, Moving speed The faster the print path is, the shorter the time during which the 3D print head 5 that has been heated to a high temperature stays in this area, and the less temperature accumulated here, the faster the temperature of the extruded PEEK material 11 is cooled, and the crystallinity formed. The smaller the moving speed, the shorter the printing path, the longer the time during which the 3D print head 5 that has been heated to a high temperature stays in this area, the more temperature accumulated here, the slower the temperature of the extruded PEEK material 11 is. , the greater the degree of crystallinity formed, thus forming PEEK materials of different crystallinity in different printing areas;

[0024] 4) Finally, PEEK parts 13, PEEK parts 13 having different crystallinity at different positions are obtained on the printing substrate 12, or the corresponding heat treatment is performed according to requirements.

[0025] The invention adopts a 3D printing method of global temperature control, local quick cooling, partial printing process parameter variation (printing moving speed, printing path) to print PEEK parts with different crystallinity and different performance, and print different in different areas. Crystalline PEEK material parts to have different characteristics for different application needs

Claims

Claim

[Claim 1] A controlled cold deposition 3D printing method for a PEEK material, comprising the steps of:

1) Using the overall temperature control system (1) to heat the 3D printer working cavity (2) as a whole, and use the air circulation system (3) to circulate the internal airflow of the 3D printer working cavity (2) in the thermal insulation system ( 4) The thermal insulation of the 3D printer working cavity (2) forms a desired stable global temperature field;

2) Then use the local temperature measurement system (6) and the local cooling system (7) on the 3D print head (5), together with the local temperature disperser (8), form a solid, controllable near the 3D print head (5) a local cooling system, wherein the local cooling system (7) adopts an air cooling, liquid cooling or semiconductor cooling method;

3) The system controller (9) controls the motion system (10) to drive the 3D print head (5) to move according to the model information and extrude the PEEK material according to the set model data (11); the same system controller (9) Adjust the temperature and distribution of the local temperature field according to the required crystallinity information set in the design, so that the PEEK material (11) undergoes different cooling rates and steady-state temperatures after extrusion, so that it is Forming different degrees of crystallinity;

Or the system controller (9) controls the moving speed and the printing path of the 3D printing head (5) that has been heated to a high temperature according to the required crystallinity information set in each design: the moving speed is higher. Faster, the longer the print path, the shorter the daytime of the 3D print head (5) that has been heated to a high temperature, the less temperature accumulated here, the faster the extruded PEEK material (11) cools down, forming The smaller the crystallinity is, the slower the moving speed is, the shorter the printing path is, the longer the 3D print head (5) that has been heated to a high temperature stays in this area, the more temperature accumulates here, the extruded PEEK The slower the temperature of the material (11), the greater the degree of crystallinity formed, and the formation of PEEK materials of different crystallinity in different printing areas;

4) Finally, PEEK parts (13) with different crystallinity at different positions are obtained on the printed substrate (12), and PEEK parts (13) are used directly, or heat treatment is performed according to requirements.