A fused deposition modeling device and method with controllable crystallinity

Abstract

The present invention provides a fused deposition modeling device with controllable crystallinity. The molding inner chamber has a crystallinity heating control module connected by a telescopic device, which reduces the impact of temperature fluctuations on the component during printing; according to different stages of the printing process, different crystallization temperatures and crystallization times are set for different heights of the component to make the overall crystallinity of the material more stable; in addition, after the printing task is completed, this crystallization heating control system continues to work according to the set temperature curve to ensure that the crystallization cooling rate of the component is stable, thereby reducing the probability of defects caused by thermal stress in the component and improving interlayer bonding; the fused deposition modeling method with controllable crystallinity of the embodiment of the present invention is used for the above-mentioned fused deposition modeling device with controllable crystallinity, thereby achieving a more stable crystallization temperature and crystallization cooling rate of the component and uniform crystallization inside the component.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing modeling, and in particular to a fused deposition modeling device and method with controllable crystallinity. Background Art

[0002] The majority of existing additively manufactured medical implants are made of metals such as titanium, tantalum, and titanium alloys. With increasing use, it's been discovered that the elastic modulus of these metals is significantly higher than that of human bone. Even if the elastic modulus of the implant is reduced through topological optimization and lightweight lattice structure design (assuming other mechanical properties are met), it still exceeds that of human bone, which can easily lead to problems such as stress shielding. Consequently, increasing research is seeking implant materials with an elastic modulus closer to that of human bone. Studies have shown that the polymer polyetheretherketone (PEEK) has an elastic modulus closer to that of human bone than metal, making it an ideal alternative to existing metal implants.

[0003] There are currently two main 3D printing technologies for PEEK materials: fused deposition modeling (FDM) and selective laser sintering (SLS). The changes in the shape and size of PEEK powder printed by SLS are relatively complex during the sintering process; the harmful gases generated during the sintering process may cause product contamination; PEEK powder in unsintered areas cannot be recycled for secondary use, and the waste of materials leads to high costs. Compared with the above shortcomings of SLS technology, the cost of printing PEEK with FDM technology is lower, and no harmful gases are generated during the printing process. Therefore, considering various cost factors (such as equipment cost and time cost), in existing industrial production, the process of PEEK additive manufacturing is shifting more from SLS to FDM.

[0004] Currently, melt extrusion 3D printers capable of printing PEEK are broadly divided into two types: low-temperature FDM printers and high-temperature FDM printers. PEEK is a semi-crystalline polymer with a glass transition temperature of 143°C. Therefore, the primary difference between low-temperature (typically chamber temperatures below 90°C) and high-temperature (typically chamber temperatures above 200°C) FDM printers lies in the printing chamber temperature. This chamber temperature affects the crystallinity of PEEK components. Specifically, a print zone temperature (or chamber temperature) below the glass transition temperature results in amorphous printing, while a print zone temperature (or chamber temperature) above the glass transition temperature results in crystalline printing. PEEK components printed using low-temperature FDM printers require annealing to release residual stresses within the component and strengthen interlayer bonding (increasing component crystallinity during annealing). Furthermore, this low-temperature printing process is highly susceptible to component warping, so adhesive bonding between the component or support and the base plate is often used to ensure the stability of the first layer. This method carries certain risks for the production of medical implants or other surgical devices, requiring secondary cleaning to ensure biotoxicity. However, PEEK components printed by high-temperature FDM printers require neither annealing nor base plate gluing, which has significant advantages for the production of medical implants or other surgical instruments and shortening the time of the entire supply chain.

[0005] Currently, high-temperature FDM printers also have their own challenges. These primarily include poor print platform temperature uniformity, poor chamber temperature stability, uncontrollable component crystallinity, and an unstable feed system. Specifically, existing FDM printers rely primarily on heat conduction to heat the platform, resulting in higher temperatures closer to the heat source and lower temperatures farther away. This property directly leads to temperature inhomogeneities between the center and edges of the print platform. To control the printer chamber temperature, while ensuring a sealed print space, heat conduction or hot air circulation are often used. Heat transfer occurs primarily from the periphery of the chamber to the interior, controlled by temperature sensors. Due to the inherent characteristics of the equipment, the chamber temperature sensors are typically located on the chamber walls, resulting in fluctuations in the temperature of the print area relative to the sensor temperature. Hot air circulation, which blows air from the build plate and then circulates it through a recovery device located above the printhead, controls the chamber temperature. Because the initial hot air temperature is higher than the chamber gas temperature but lower than the printhead's printing temperature, this creates a fluctuating temperature gradient from bottom to top within the print area. Furthermore, thermal convection between the hot air circulation and the printhead can affect the temperature stability of the printhead. This chamber temperature instability also directly impacts the crystallinity of PEEK components, which is influenced by crystallization temperature, crystallization time, and cooling rate. Existing high-temperature equipment stops heating upon completion of a print job. This significantly impacts the cooling rate of the crystals, resulting in poor crystallinity uniformity within the component. Summary of the Invention

[0006] The purpose of the present invention is to provide a fused deposition modeling device with controllable crystallinity, wherein the crystallization temperature and crystallization cooling rate of the component are more stable and the crystallization inside the component is uniform; a fused deposition modeling method with controllable crystallinity is used for the fused deposition modeling device with controllable crystallinity, wherein the crystallization temperature and crystallization cooling rate of the component are more stable and the crystallization inside the component is uniform.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions.

[0008] According to one aspect of the present invention, the present invention provides a fused deposition modeling device with controllable crystallinity, comprising:

[0009] A 3D printing structure comprises a molding chamber, a motion module, and a build platform movable within the molding chamber and equipped with a heating device. The motion module is disposed within the molding chamber and is connected to a print head module. The print head module is disposed above the build platform. The print head module is moved along the X-axis and the Y-axis by the motion module. The build platform is moved along the Z-axis within the molding chamber by a lifting drive module.

[0010] The material supply module is connected to the print head module through a material delivery pipe and is used to supply printing materials;

[0011] The crystallinity heating control module is arranged on the inner wall of the molding chamber through a telescopic device, and the telescopic device is arranged between the building platform and the printing nozzle module; the crystallinity heating control module monitors the temperature of the component at each stage, and adjusts the crystallization temperature and crystallization time of the component at different height positions in each stage according to the monitoring data; and continues to work after the component printing task is completed.

[0012] The controller is electrically connected to the print head module, the motion module, the heating device of the building platform, the lifting drive module, the telescopic device, the crystallinity heating control module and the 3D printing structure.

[0013] In some embodiments of the present application, the print head module includes a material preheating pipe, a pressure pulse device, a heating melt pool and a material extrusion assembly that are connected in sequence. The material supply module is connected to the material preheating pipe through a feed pipe. A heating element is provided in the heating melt pool. The material extrusion assembly corresponds to the building platform.

[0014] In some embodiments of the present application, a radiator is provided on the material preheating tube.

[0015] In some embodiments of the present application, the material extrusion assembly includes a temperature sensor, a nozzle heating element and a nozzle, the temperature sensor and the nozzle heating element are both connected to the nozzle, and the nozzle corresponds to the building platform.

[0016] In some embodiments of the present application, the radiator includes a liquid cooling system and a cooling fan. The liquid cooling system is in thermal contact with the outer surface of the material preheating tube. The cooling fan is connected to the outside of the radiator for synchronously dissipating heat for the liquid cooling system and the radiator.

[0017] In some embodiments of the present application, the motion module of the 3D printing structure is a Core XY system, or Delta, or H-bot, or Cartesian, or XZ gantry, or polar coordinate system, or multi-axis robotic arm.

[0018] In some embodiments of the present application, the telescopic device is a hydraulic telescopic rod, one end of the hydraulic telescopic rod being telescopic is connected to the crystallinity heating control module, and the other end of the hydraulic telescopic rod is connected to the inner wall of the molding bin.

[0019] In some embodiments of the present application, the crystallinity heating control module has multiple independent heating heat sources.

[0020] In some embodiments of the present application, the heat source is a UV light radiation heat source, or an infrared radiation heat source, or a combination of the two.

[0021] According to one aspect of the present invention, the present invention provides a fused deposition modeling method with controllable crystallinity, which is used in the above-mentioned fused deposition modeling apparatus with controllable crystallinity, comprising the following steps:

[0022] S1: Monitor the temperature of the component at each stage, and adjust the crystallization temperature and crystallization time of the component at different heights in each stage according to the monitoring data;

[0023] S2: The print head module extrude the printing material to manufacture the component on the building platform, and S1 is executed at the same time;

[0024] S3: The component printing task is completed, and S1 continues to work to stabilize the crystallization cooling rate of the component.

[0025] In some embodiments of the present application, the printing nozzle module includes a material preheating pipe, a pressure pulse device, a heating melt pool and a material extrusion assembly which are connected in sequence; the material supply module is connected to the material preheating pipe through a feed pipe, a heating element is provided in the heating melt pool, and the material extrusion assembly corresponds to the building platform; the material extrusion assembly includes a temperature sensor, a nozzle heating element and a nozzle, the temperature sensor and the nozzle heating element are both connected to the nozzle, and the nozzle corresponds to the building platform; the S2 is specifically the printing material extrusion, which adjusts the feed force of the wire according to the temperature monitoring data of the heating melt pool and the nozzle, and then extrudes the printing material to be constructed on the building platform.

[0026] It can be seen from the above technical solutions that the embodiments of the present invention have at least the following advantages and positive effects:

[0027] In the fused deposition modeling device with controllable crystallinity of the embodiment of the present invention, during the 3D printing process, the printing core area (molding inner chamber) has a crystallinity heating control module connected by the telescopic end of the telescopic device, which further reduces the impact of temperature fluctuations on the core area during the printing process; at the same time, according to different stages of the printing process, different crystallization temperatures and crystallization times are set for different heights of the component to make the overall crystallinity of the material more stable; in addition, after the printing task is completed, this crystallization heating control system continues to work according to the set temperature curve to ensure that the crystallization cooling rate of the component is stable, thereby reducing the probability of defects caused by thermal stress in the component and improving interlayer bonding; the fused deposition modeling method with controllable crystallinity of the embodiment of the present invention is used for the above-mentioned fused deposition modeling device with controllable crystallinity, thereby achieving a more stable crystallization temperature and crystallization cooling rate of the component and uniform crystallization inside the component. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the structure of a fused deposition modeling device with controllable crystallinity;

[0029] Figure 2 Exploded diagram of a fused deposition modeling device with controlled crystallinity;

[0030] Figure 3 for Figure 2 A magnified view of middle A;

[0031] Figure 4 for Figure 2 Enlarged view of middle B;

[0032] In the picture:

[0033] 1. 3D printing structure; 11. Forming chamber; 12. Motion module; 13. Build platform; 14. Feed pipe; 2. Print head module; 21. Material preheating pipe; 22. Pressure pulse device; 23. Heating pool; 24. Material extrusion assembly; 241. Temperature sensor; 242. Nozzle heating element; 243. Nozzle;

[0034] 3. Telescopic device; 4. Crystallinity heating control module; 5. Radiator. DETAILED DESCRIPTION

[0035] Although the present invention is susceptible of being embodied in different forms, only some of the specific embodiments are shown in the drawings and will be described in detail in this specification. It should be understood that this description should be regarded as an exemplary illustration of the principles of the invention and is not intended to limit the invention to that described herein.

[0036] Thus, a feature indicated in this specification is intended to illustrate one of the features of one embodiment of the present invention, rather than to imply that every embodiment of the present invention must have the described feature. Furthermore, it should be noted that this specification describes many features. Although certain features can be combined together to illustrate possible system designs, these features can also be used in other, not explicitly described, combinations. Thus, unless otherwise noted, the described combinations are not intended to be limiting.

[0037] In the embodiments shown in the accompanying drawings, directional indications (such as up, down, left, right, front, and rear) used to explain the structure and movement of various components of the present invention are not absolute but relative. These descriptions are applicable when these components are in the positions shown in the accompanying drawings. If the descriptions of the positions of these components are changed, the directional indications will also change accordingly.

[0038] The preferred embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings of this specification.

[0039] Figure 1 Schematic diagram of the structure of a fused deposition modeling device with controllable crystallinity; Figure 2 Exploded diagram of a fused deposition modeling device with controlled crystallinity; Figure 3 for Figure 2 A magnified view of middle A; Figure 4 for Figure 2 Magnified view of B.

[0040] Reference Figures 1 to 4 As shown:

[0041] According to one aspect of the present invention, the present invention provides a fused deposition modeling device with controllable crystallinity, comprising: a 3D printing structure 1, a material supply module, a crystallinity heating control module 4 and a controller.

[0042] Specifically, the operator can first use the 3D printing structure 1, which has a molding chamber 11 and a motion module 12, and a building platform 13 with a heating device that is movable in the molding chamber 11. The motion module 12 is set in the molding chamber 11 and is connected to the print head module 2. The print head module 2 is correspondingly set above the building platform 13. The print head module 2 is moved along the X-axis and Y-axis directions by the motion module 12. The building platform 13 is moved along the Z-axis direction in the molding chamber 11 by a lifting drive module, wherein the lifting drive module is a conventional lifting structure;

[0043] The material supply module is connected to the print head module 2 via the material delivery pipe 14 and is used to supply printing materials. It should be noted that the material supply module is usually located outside the molding chamber 11 to minimize the weight of the print head module 2 and prevent the parts from overheating and causing aging.

[0044] The crystallinity heating control module 4 is installed on the inner wall of the molding chamber 11 via a telescopic device 3. The telescopic device 3 is installed between the build platform 13 and the print head module 2. It should be noted that the number of telescopic devices 3 is not fixed and can be adjusted as needed. The telescopic device 3 cooperates with the crystallinity heating control module 4 to drive the crystallinity heating control module to move during the component printing process, thereby adjusting the crystallization temperature and crystallization time of the component at different height positions in each stage, thus forming a stable crystallization process. At the same time, after the printing task is completed, the crystallinity heating control module 4 will not stop working immediately, but will continue to operate according to the set temperature curve to ensure that the component has a stable crystallization cooling rate, thereby obtaining a component with good interlayer bonding.

[0045] The controller is used to set the initial conditions for printing. It is electrically connected to the print head module 2, the motion module 12, the heating device of the building platform 13, the lifting drive module, the telescopic device 3, the crystallinity heating control module 4 and the 3D printing structure 1, so that the controller can coordinate the control of the print head module 2, the motion module 12, the lifting drive module, the telescopic device 3, the crystallinity heating control module 4 and the 3D printing structure 1. It should be noted that the controller can be a single-chip microcomputer or other computer that can realize the control function, such as a PLC.

[0046] Specifically, the crystallinity heating control module 4 comprises a component surface temperature sensor, a heating unit, and a temperature control unit. The output of the component surface temperature sensor is connected to the input of the controller, the output of the controller is connected to the input of the temperature control unit, and the output of the temperature control unit is connected to the heating unit. The component surface temperature sensor is used to simultaneously monitor multiple points on the component surface to confirm the component surface temperature and provide feedback to the controller. The controller controls the heating unit through the temperature control unit to heat the component and adjust the component's crystallization temperature and crystallization time.

[0047] Specifically, in one embodiment of the present application, the print head module 2 includes a material preheating pipe 21, a pressure pulse device 22, a heating melt pool 23 and a material extrusion assembly 24 that are connected in sequence. The material supply module is connected to the material preheating pipe 21 through the feed pipe 14; the printing material is heated when entering the material preheating pipe 21 for preheating. Since a heating element is provided in the heating melt pool 23, the printing material is heated and becomes a molten state. Under the action of the pressure pulse device 22, the printing material that becomes a molten state is extruded through the material extrusion assembly 24 at a specific required rate onto the component platform or the component that has been deposited on the component platform. The material extrusion assembly 24 corresponds to the building platform 13.

[0048] In some embodiments of the present application, a heat sink 5 is mounted on the material preheating tube 21. The heat sink 5 simultaneously cools the material preheating tube 21, thereby protecting the material preheating tube 21 from high temperatures that may affect its service life. It should be noted that the heat sink 5 is typically made of aluminum, but can also be made of other thermally conductive materials (with a thermal conductivity no less than that of aluminum). This improves the stability of the material preheating tube 21 during long-term operation in high-temperature environments, thereby increasing the freedom of process parameter selection during design.

[0049] In some embodiments of the present application, the material extrusion assembly 24 includes a temperature sensor 241, a nozzle heating element 242, and a nozzle 243. The temperature sensor 241 and the nozzle heating element 242 are both connected to the nozzle 243. The nozzle heating element 242 is used to heat the nozzle. The nozzle 243 corresponds to the build platform 13. The temperature sensor 241 is used to detect the temperature of the nozzle, and forms a control response with the operation of the entire cooling system of the material extrusion assembly 24 (i.e., the radiator 5), facilitating the temperature adjustment of the nozzle 243 through the radiator 5. The material extrusion assembly 24 has different size modes, and can be replaced with nozzles 243 of different lengths according to material requirements to ensure a sufficiently large heated molten pool 23, thereby meeting the printing requirements of components of different sizes.

[0050] In some embodiments of the present application, the radiator 5 includes a liquid cooling system and a cooling fan. The liquid cooling system is in thermal contact with the outer surface of the material preheating tube 21, and the cooling fan is connected to the outside of the radiator 5 for synchronous heat dissipation of the liquid cooling system and the radiator 5.

[0051] In some embodiments of the present application, the motion module 12 of the 3D printing structure 1 is a Core XY system, or a Delta, or an H-bot, or a Cartesian, or an XZ gantry, or a polar coordinate system, or a multi-axis robotic arm.

[0052] In some embodiments of the present application, the telescopic device 3 is a hydraulic telescopic rod, and one telescopic end of the hydraulic telescopic rod is connected to the crystallinity heating control module 4, and the other end of the hydraulic telescopic rod is connected to the inner wall of the molding bin 11. The function of the hydraulic telescopic rod is to control the hydraulic telescopic rod through a controller, thereby controlling the extension and contraction of the crystallinity heating control module 4, so as to achieve different crystallization temperatures and crystallization times for different heights of the components at different stages, thereby forming a stable crystallization process.

[0053] In some embodiments of the present application, the crystallinity heating control module 4 has multiple independent heating heat sources.

[0054] In some embodiments of the present application, the heat source is a UV light radiation heat source, or an infrared radiation heat source, or a combination of the two.

[0055] From the above, it can be seen that the fused deposition modeling equipment with controllable crystallinity has a crystallinity heating control module 4 in its printing core area, which further reduces the impact of temperature fluctuations on the core area during the printing process. At the same time, according to the different stages of the printing process, different crystallization temperatures and crystallization times are set for different heights of the model to make the overall crystallinity of the material more stable. In addition, after the printing task is completed, this crystallinity heating control module 4 continues to operate according to the set temperature curve to ensure that the crystallization cooling rate of the component is stable, thereby reducing the probability of defects caused by thermal stress in the component and improving interlayer bonding. In addition, the dual-group gear wire feeding structure has an additional controller, such as FEPG high-performance computing control, which can adjust the feed force and feed speed of the wire feeding structure in a timely manner according to printing requirements. This mode ensures the stability of the entire wire feeding process. In addition, the heating element is set in the heating pool 23 in the printing nozzle module 2 to make the material have better Z-axis adhesion after extrusion, and the pressure pulse device 22, which is also controlled by FEPG, can control the extrusion rate according to the needs of the model, thereby improving the printing accuracy and interlayer bonding of the component.

[0056] According to one aspect of the present invention, the present invention provides a fused deposition modeling method with controllable crystallinity, which is used in the above-mentioned fused deposition modeling device with controllable crystallinity, comprising the following steps:

[0057] S1: Monitor the temperature of the component at each stage, and adjust the crystallization temperature and crystallization time of the component at different heights in each stage according to the monitoring data;

[0058] For example, the temperature of the component is monitored at the initial stage of printing, and the crystallization temperature and crystallization time of the component at different height positions in the initial stage are adjusted according to the monitoring data; similarly, the middle or late stages are handled in the same way as the initial stage.

[0059] S2: The print head module 2 extrude the printing material to manufacture the component on the building platform 13, and S1 is executed at the same time;

[0060] S3: The component printing task is completed, and S1 continues to work to stabilize the crystallization cooling rate of the component.

[0061] Specifically, in one embodiment of the present application, the print head module 2 includes a material preheating pipe 21, a pressure pulse device 22, a heating molten pool 23 and a material extrusion assembly 24 which are connected in sequence. The material supply module is connected to the material preheating pipe 21 through the material delivery pipe 14. When the printing material enters the material preheating pipe 21, it is heated for preheating. Since a heating element is provided in the heating molten pool 23, the printing material is heated and molten. Under the action of the pressure pulse device 22, the molten printing material is extruded through the material extrusion assembly 24 at a specific required rate onto the component platform or the already deposited component. On the component deposited on the component platform, the material extrusion component 24 corresponds to the building platform 13; the material extrusion component 24 includes a temperature sensor 241, a nozzle heating element 242 and a nozzle 243, the temperature sensor 241 and the nozzle heating element 242 are both connected to the nozzle 243, the nozzle heating element 242 is used to heat the nozzle, and the nozzle 243 corresponds to the building platform 13; S2 is specifically the printing material extrusion, which adjusts the feed force of the wire according to the temperature monitoring data of the heating melt pool 23 and the nozzle 243, and then extrudes the printing material to perform the construction on the building platform 13.

[0062] The crystallinity-controllable fused deposition modeling method, used in the above-mentioned crystallinity-controllable fused deposition modeling device, has the following advantages:

[0063] A. Through S1 and S2, the crystallization temperature, crystallization time and crystallization cooling rate of the component can be adjusted and controlled. This leads to:

[0064] a. Reduce the impact of temperature gradient fluctuations in the build area on component crystallinity;

[0065] b. Reduce the impact of thermal stress on components, reduce the degree of warping and shrinkage, and thus improve the dimensional stability of components;

[0066] c. Through S3, the crystallization temperature and crystallization cooling rate of the component are ensured to be more stable, and the uneven crystallization inside the component is reduced;

[0067] d. Enhance the interlayer bonding ability of the component, thereby improving the mechanical strength of the component in the vertical direction and even the whole;

[0068] The above-mentioned fused deposition modeling device with controllable crystallinity uses the fused deposition modeling method with controllable crystallinity, and has the following advantages:

[0069] B. The core area of the build is heated by using non-convection heat radiation and other similar modes, reducing the size of the nozzle module and enhancing printing flexibility and space utilization.

[0070] C. The material supply is controlled by two synchronized dual-gear wire feeding modules connected to a controller, such as FEPG calculation control, which can improve the stability of the feeding process.

[0071] D. By adding a molten pool module to the print head module 2 and setting the pressure pulse device 22 according to different needs, the material is extruded at different rates under different conditions, thereby further improving the printing accuracy of the entire component.

[0072] Based on the above technical solution, the embodiments of the present invention have at least the following advantages and positive effects:

[0073] In the fused deposition modeling device with controllable crystallinity of the embodiment of the present invention, during the 3D printing process, the printing core area (molding inner chamber) has a crystallinity heating control module 4 connected by the telescopic end of the telescopic device 3, which further reduces the impact of temperature fluctuations on the core area during the printing process; at the same time, according to different stages of the printing process, different crystallization temperatures and crystallization times are set for different heights of the model to make the overall crystallinity of the material more stable; in addition, after the printing task is completed, this crystallization heating control system continues to work with the set temperature curve to ensure that the crystallization cooling rate of the component is stable, thereby reducing the probability of defects caused by thermal stress in the component and improving interlayer bonding; the fused deposition modeling method with controllable crystallinity of the embodiment of the present invention is used for the above-mentioned fused deposition modeling device with controllable crystallinity, thereby achieving a more stable crystallization temperature and crystallization cooling rate of the component and uniform crystallization inside the component.

[0074] While the present invention has been described with reference to several exemplary embodiments, it should be understood that the terms used are intended to be illustrative and exemplary rather than restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above-described embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope of the appended claims. All changes and modifications that fall within the scope of the claims or their equivalents are intended to be covered by the appended claims.

Claims

1. A fused deposition modeling device with controllable crystallinity, characterized in that: include: A 3D printing structure comprises a molding chamber, a motion module, and a build platform movable within the molding chamber and equipped with a heating device. The motion module is disposed within the molding chamber and is connected to a print head module. The print head module is disposed above the build platform. The print head module is moved along the X-axis and the Y-axis by the motion module. The build platform is moved along the Z-axis within the molding chamber by a lifting drive module. The material supply module is connected to the print head module through a material delivery pipe and is used to supply printing materials; A crystallinity heating control module is disposed on the inner wall of the molding chamber via a telescopic device, wherein the telescopic device is disposed between the building platform and the print head module. During the component printing process, the telescopic device drives the crystallinity heating control module to move, thereby adjusting the crystallization temperature and crystallization time of the component at different height positions in each stage. At the same time, after the printing task is completed, the crystallinity heating control module will not stop working immediately, but will continue to work according to the set temperature curve. The crystallinity heating control module has multiple independent heating heat sources. The controller is electrically connected to the print head module, the motion module, the heating device of the building platform, the lifting drive module, the telescopic device, the crystallinity heating control module and the 3D printing structure.

2. The fused deposition modeling device with controllable crystallinity according to claim 1, characterized in that: The printing nozzle module includes a material preheating pipe, a pressure pulse device, a heating melt pool and a material extrusion assembly which are connected in sequence. The material supply module is connected to the material preheating pipe through a material delivery pipe. A heating element is provided in the heating melt pool. The material extrusion assembly corresponds to the building platform.

3. The fused deposition modeling apparatus with controllable crystallinity according to claim 2, wherein: A radiator is provided on the material preheating tube; the radiator includes a liquid cooling system, the liquid cooling system is in thermal contact with the outer surface of the material preheating tube, and a cooling fan is connected to the outside of the radiator for dissipating heat from the radiator.

4. The fused deposition modeling apparatus with controllable crystallinity according to claim 2, wherein: The material extrusion assembly includes a temperature sensor, a nozzle heating element and a nozzle. The temperature sensor and the nozzle heating element are both connected to the nozzle, and the nozzle corresponds to the building platform.

5. The fused deposition modeling apparatus with controllable crystallinity according to claim 1, wherein: The motion module of the 3D printing structure is a Core XY system, or Delta, or H-bot, or Cartesian, or XZ gantry, or polar coordinate system, or multi-axis robotic arm.

6. The fused deposition modeling apparatus with controllable crystallinity according to claim 1, wherein: The telescopic device is a hydraulic telescopic rod, one end of the hydraulic telescopic rod that is telescopic is connected to the crystallinity heating control module, and the other end of the hydraulic telescopic rod is connected to the inner wall of the molding chamber.

7. The fused deposition modeling apparatus with controllable crystallinity according to claim 1, characterized in that: The heat source is a UV light radiation heat source, an infrared radiation heat source, or a combination of a UV light radiation heat source and an infrared radiation heat source.

8. A fused deposition modeling method with controllable crystallinity, used in the fused deposition modeling apparatus with controllable crystallinity according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: Monitor the temperature of the component at each stage, and adjust the crystallization temperature and crystallization time of the component at different heights in each stage according to the monitoring data; S2: The print head module extrude the printing material to manufacture the component on the building platform, and S1 is executed at the same time; S3: The component printing task is completed, and S1 continues to work to stabilize the crystallization cooling rate of the component.

9. The method for fused deposition modeling with controllable crystallinity according to claim 8, wherein: The print head module includes a material preheating pipe, a pressure pulse device, a heating bath, and a material extrusion assembly that are connected in sequence. The material supply module is connected to the material preheating pipe through a material delivery pipe. A heating element is provided in the heating bath. The material extrusion assembly corresponds to the building platform. The material extrusion assembly includes a temperature sensor, a nozzle heating element and a nozzle, wherein the temperature sensor and the nozzle heating element are both connected to the nozzle, and the nozzle corresponds to the building platform; The S2 is specifically to adjust the feed force of the printing material extrusion according to the temperature monitoring data of the heating melt pool and the nozzle, and then extrude the printing material to perform construction on the building platform.

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