1. A method for solving the thermal deformation of a PEEK material part in 3D printing is characterized in that: the method comprises the following steps:

(1) the printed PEEK material part is wrapped by adopting heat insulation paper, so that the PEEK material part is completely shielded;

(2) filling heat-conducting molding sand with the height of 2-4cm into a heat-conducting container with the volume larger than that of the PEEK material part, and putting the wrapped PEEK material part into the heat-conducting container;

(3) filling heat-conducting molding sand into the heat-conducting container until the heat-conducting molding sand is fully accumulated at a position 2-5cm above the upper end surface of the PEEK material part;

(4) uniformly pressing the heat-conducting molding sand by using a flat bottom mold, continuously adding the heat-conducting molding sand with the height of 2-5cm after compacting, and uniformly pressing and compacting;

(5) continuously adding the heat-conducting molding sand into the heat-conducting container until the heat-conducting container is full, vertically pressing the heat-conducting molding sand from top to bottom by using a steel plate, compacting the heat-conducting molding sand at the top, clearing the redundant heat-conducting molding sand by using a brush, and covering the heat-conducting container;

(6) adding a pressure device on the top of the cover of the heat-conducting container, wherein the weight of the pressure device is 1-10 kg;

(7) putting the heat-conducting container with the PEEK material part into a heat treatment box, heating the heat-conducting container from normal temperature to 200-;

(8) and taking out the PEEK material part cooled to room temperature, and applying.

2. The method for solving the thermal deformation of the 3D printed PEEK material part, according to claim 1, is characterized in that: the heat insulation paper is made of aluminum foil paper.

3. The method for solving the thermal deformation of the 3D printed PEEK material part, according to claim 1, is characterized in that: the heat-conducting container is a stainless steel container.

4. The method for solving the thermal deformation of the 3D printed PEEK material part, according to claim 1, is characterized in that: the heat-conducting molding sand is cast red sand.

5. The method for solving the thermal deformation of the 3D printed PEEK material part, according to claim 1, is characterized in that: in the step (2), a gap is reserved between the side surface of the PEEK material part and the inner wall of the heat-conducting container, and the width of the gap is 2-3 cm.

Background

The PEEK (polyether-ether-ketone) fused deposition 3D printing technology is characterized in that a three-dimensional model is cut into layers through layer cutting software, a building path of each layer is calculated, then an extruder nozzle is built layer by layer from bottom to top along the path calculated by the layer cutting software, and finally a needed PEEK material part is formed. The prepared PEEK material part has excellent mechanical property and good chemical inertness, can be used as a light high-performance material with huge potential to replace a metal material to be applied to an orthopedics customized product, particularly has excellent biocompatibility and wear-resisting characteristics, and becomes one of ideal materials of the existing skull prosthesis implant.

Chinese patent CN107234810B issued a heat treatment method for 3D printing PEEK material parts, the method firstly puts the 3D printing PEEK material parts into an oven by fused deposition, and dries the PEEK material parts; then, obtaining a corresponding PEEK material part by adopting a full-field heat treatment method, or a surface heat treatment method, or a local heat treatment mode; finally, the PEEK material part is subjected to aging treatment, namely the PEEK material part is applied to practice, different areas of the PEEK material are treated for different time by adopting different temperatures, the needed PEEK material part with practical application value is formed finally, and the process is simple.

The above techniques still have many disadvantages in practical use, such as: the technology only studies the influence of heat treatment processes with different temperatures on mechanical properties and crystallinity of the PEEK material, and cannot solve the deformation problem of a 3D printed individualized PEEK material implant after heat treatment, and after the heat treatment by the method, the PEEK material implant cannot be matched with a patient, so that the high-strength PEEK material implant can only be manufactured by means of material reduction such as machining, wherein the PEEK skull repairing plate is taken as an example, and the effective utilization rate of the PEEK plate can only reach about 15%. Therefore, the heat treatment technology for the individualized PEEK material implant becomes a research heat point and a difficulty in the biomedical field, and no suitable heat treatment method exists in the known technical level.

Disclosure of Invention

The invention aims to provide a method for solving the thermal deformation of a PEEK material part in 3D printing, which overcomes the defects of the prior art and solves the problem of the thermal deformation of the PEEK material part; a large amount of heat-conducting molding sand is filled around the PEEK material part, so that the PEEK material part is heated more uniformly in the heat treatment process, the cooling rate of the PEEK material part can be reduced in the cooling process, the plasticity is improved, and finally the PEEK material part with excellent mechanical property and practical application value is formed.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a method for solving the problem of thermal deformation of a PEEK material part in 3D printing comprises the following steps:

(1) the printed PEEK material part is wrapped by adopting high-temperature-resistant heat-insulating paper, so that the PEEK material part is completely shielded;

(2) filling heat-conducting molding sand with the height of 2-4cm into a heat-conducting container with the volume larger than that of the PEEK material part, and putting the wrapped PEEK material part into the heat-conducting container;

(3) filling heat-conducting molding sand into the heat-conducting container until the heat-conducting molding sand is fully accumulated at a position 2-5cm above the upper end surface of the PEEK material part;

(4) uniformly pressing the heat-conducting molding sand by using a flat bottom mold, continuously adding the heat-conducting molding sand with the height of 2-5cm after compacting, and uniformly pressing and compacting;

(5) continuously adding the heat-conducting molding sand into the heat-conducting container until the heat-conducting container is full, vertically pressing the heat-conducting molding sand from top to bottom by using a steel plate, compacting the heat-conducting molding sand at the top, clearing the redundant heat-conducting molding sand by using a brush, and covering the heat-conducting container;

(6) adding a pressure device on the top of the cover of the heat-conducting container, wherein the weight of the pressure device is 1-10 kg;

(7) putting the heat-conducting container with the PEEK material part into a heat treatment box, heating the heat-conducting container from normal temperature to 200-;

(8) and taking out the PEEK material part cooled to room temperature, and applying.

Further, the heat insulation paper is made of aluminum foil paper.

Further, the heat-conducting container is a stainless steel container.

Furthermore, the heat-conducting molding sand is cast red sand.

Furthermore, in the step (2), a gap is reserved between the side surface of the PEEK material part and the inner wall of the heat-conducting container, and the width of the gap is 2-3 cm.

The invention has the beneficial effects that: compared with the prior art, the method for solving the thermal deformation of the PEEK material part in the 3D printing process has the following advantages: aiming at the PEEK material part subjected to fused deposition 3D printing, the PEEK material part with different crystallinity is obtained by adopting a filling and pressurizing full-field heat treatment method; the problem of thermal deformation of PEEK material parts is solved, and the PEEK material implant can be smoothly matched with a patient; a large amount of molding sand is filled around the PEEK material part, so that the PEEK material part is heated more uniformly in the heat treatment process, the cooling rate of the PEEK material part can be reduced in the cooling process, the plasticity is improved, and finally the PEEK material part with excellent mechanical property and practical application value is formed.

Drawings

FIG. 1 is a schematic structural view of the present invention;

wherein, 1 pressure device, 2 cover, 3 heat-conducting container; 4 heat-conducting molding sand, 5 heat-insulating paper and 6PEEK material parts.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.

In the embodiment shown in fig. 1, a method for solving the thermal deformation of 3D printed PEEK material parts comprises the following steps:

(1) the printed PEEK material part 6 is wrapped by high-temperature resistant heat insulation paper 5, so that the PEEK material part 6 is completely shielded;

(2) filling heat-conducting molding sand 4 with the height of 2-4cm into a heat-conducting container 3 with the volume larger than that of the PEEK material part 6, and putting the wrapped PEEK material part 6 into the heat-conducting container 3;

(3) filling heat-conducting molding sand 4 into the heat-conducting container 3 until the heat-conducting molding sand 4 is fully accumulated at a position 2-5cm above the upper end surface of the PEEK material part 6;

(4) uniformly pressing the heat-conducting molding sand 4 by using a flat bottom mold, continuously adding the heat-conducting molding sand 4 with the height of 2-5cm after compacting, and uniformly pressurizing and compacting;

(5) continuously adding the heat-conducting molding sand 4 into the heat-conducting container until the heat-conducting container is filled, vertically pressing the heat-conducting molding sand from top to bottom by using a steel plate, compacting the heat-conducting molding sand at the top, clearing the redundant heat-conducting molding sand 4 by using a brush, and covering the cover 2 of the heat-conducting container 3;

(6) adding a pressure device 1 on the top of the cover 2 of the heat-conducting container 3, wherein the weight of the pressure device 1 is 1-10 kg;

(7) putting the heat-conducting container 3 provided with the PEEK material part 6 into a heat treatment box, heating the heat-conducting container from normal temperature to 200-;

(8) and taking out the PEEK material part 6 cooled to room temperature, and applying the PEEK material part, wherein the PEEK material part can be smoothly matched with a patient.

In this embodiment, the heat insulation paper 5 is made of aluminum foil. The heat-conducting container 3 is a stainless steel container. The heat-conducting molding sand 4 is cast red sand.

In this embodiment, in the step (2), a gap is left between the side surface of the PEEK material part 6 and the inner wall of the thermal conductive container 3, and the width of the gap is 2-3 cm.

Aiming at the PEEK material part subjected to fused deposition 3D printing, the PEEK material part with different crystallinity is obtained by adopting a filling and pressurizing full-field heat treatment method; the problem of thermal deformation of PEEK material parts is solved, and the PEEK material implant can be smoothly matched with a patient; a large amount of heat-conducting molding sand is filled around the PEEK material part, so that the PEEK material part is heated more uniformly in the heat treatment process, the cooling rate of the PEEK material part can be reduced in the cooling process, the plasticity is improved, and finally the PEEK material part with excellent mechanical property and practical application value is formed.

The above embodiments are only specific examples of the present invention, and the protection scope of the present invention includes but is not limited to the product forms and styles of the above embodiments, and any suitable changes or modifications made by those skilled in the art according to the claims of the present invention shall fall within the protection scope of the present invention.