Screw for 3D printing, extrusion equipment and printing equipment

Abstract

The invention relates to a screw rod for 3D printing, extrusion equipment and printing equipment. The screw rod comprises a screw rod connecting part, a screw rod main body and a screw rod end part which are connected in sequence; the screw connecting part is in transmission connection with the power output end of the 3D printing extrusion equipment; a first spiral line and a second spiral line which are parallel to each other are arranged on the screw rod main body, the first spiral line and the second spiral line are the same in size characteristic and periodic characteristic, and the phase difference between the first spiral line and the second spiral line is 1 / 5-1 / 3 spiral line period. Compared with the prior art, the wire drawing performance can be improved through the design of the screw, the structure of the extrusion cavity is optimized, and the reliability and stability of equipment are improved. The beneficial effects are beneficial for improving the product quality and the production stability of the 3D printing extrusion equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and particularly to a screw, an extrusion device, and a printing device for 3D printing. Background Art

[0002] At present, 3D printing technology has been widely applied in various fields, such as aerospace, medical devices, automotive manufacturing, etc. Among them, 3D printing extrusion technology is a common 3D printing method, which forms a required three-dimensional structure by extruding molten material through an extruder.

[0003] However, in traditional 3D printing extrusion technology, there are some problems. The wire drawing performance of the extruded material is not ideal, and problems such as wire breakage and fracture are likely to occur, affecting the quality and strength of the product. In addition, the design of the extrusion cavity structure is unreasonable, resulting in uneven mixing of the extruded material, further affecting the consistency and appearance of the product.

[0004] For materials with a high filler ratio, the wire drawing performance of the extruded material is not ideal, and problems such as wire breakage and fracture are likely to occur, mainly due to the limitation of the constant pressure extrusion process of a single-screw thread screw.

[0005] In the traditional single-screw thread screw extrusion process, the screw rotates in the extruder, pushing the material from the feeding area to the extrusion outlet. During the entire extrusion process, the pressure exerted by the screw on the material is constant and cannot be adjusted according to the characteristics of the material.

[0006] For materials with a high filler ratio, the content of filler particles in these materials is relatively high, and the interaction force between the filler and the base material is relatively large. During the extrusion process, the filler particles will be subjected to the shearing and extrusion effects of the screw, resulting in an increase in the interaction force between the filler particles, making the fluidity of the material worse.

[0007] In addition, due to the constant pressure in the single-screw thread screw extrusion process, the shear force and extrusion force given by the constant pressure are limited, and the filler and the base material cannot be fully mixed, and there is a lack of sufficient release and exhaust space, making it difficult for the material to be densified, and it is easy to cause problems such as wire breakage and fracture of the material.

[0008] Therefore, for materials with a high filler ratio, the constant pressure extrusion process of a single-screw thread screw cannot meet their special fluidity requirements, and it is easy to cause problems such as unsatisfactory wire drawing performance, wire breakage, and fracture. To solve these problems, it is necessary to improve the screw design so that it can better meet the extrusion requirements of materials with a high filler ratio. Summary of the Invention

[0009] The purpose of the present invention is to provide a screw, extrusion equipment and printing equipment for 3D printing in order to overcome the defects of the above-mentioned prior art. The screw design of the present invention can improve the wire drawing performance, optimize the extrusion cavity structure, and improve the reliability and stability of the equipment. These beneficial effects will help improve the product quality and production stability of 3D printing extrusion equipment.

[0010] The purpose of the present invention can be achieved by the following technical solutions:

[0011] The present invention provides a screw for 3D printing extrusion equipment, comprising a screw connecting part, a screw main body, and a screw end connected in sequence;

[0012] The screw connecting portion is drivingly connected to the power output end of the 3D printing extrusion equipment;

[0013] The screw body is provided with a first spiral and a second spiral parallel to each other, the first spiral and the second spiral have the same size characteristics and period characteristics, and the phase difference between the first spiral and the second spiral is 1 / 5 to 1 / 3 of the spiral period.

[0014] Furthermore, the phase difference between the first spiral and the second spiral is 1 / 4 to 1 / 3 of the spiral period.

[0015] Furthermore, the phase difference between the first spiral and the second spiral is 1 / 3 of the spiral period.

[0016] Furthermore, a first thread groove is formed between the first spiral and the second spiral in the same period.

[0017] Furthermore, a second thread groove is formed between the first spiral line in one cycle and the second spiral line in the previous cycle.

[0018] Furthermore, the diameter at the lowest point of the first thread groove is 70-85% of the diameter of the coaxial upward spiral.

[0019] Furthermore, the diameter at the lowest point of the second thread groove is 60-80% of the diameter of the coaxial upward spiral.

[0020] A second aspect of the present invention provides a 3D printing extrusion device, comprising an extruder housing, a power output assembly arranged in the extruder housing, a first screw drivingly connected to a first power output end of the power output assembly, and a second screw drivingly connected to a second power output end of the power output assembly, wherein the first screw is the above-mentioned screw in the present invention, and the spiral line on the second screw matches the spiral groove on the first screw;

[0021] The outer wall surface of the first screw, the outer wall surface of the second screw, and the inner wall surface of the extruder housing together constitute an extrusion cavity.

[0022] Furthermore, there is a spiral on the first screw rod, and the first thread groove and the second thread groove on the first screw rod are both engaged with the spiral on the second screw rod to achieve periodic changes in the extrusion pressure, thereby preventing the extruded material from breaking during wire drawing in a feeding scenario with a high filler ratio.

[0023] The third aspect of the present invention provides a 3D printing device, including the above-mentioned 3D printing extrusion device.

[0024] Compared with the prior art, the present invention has the following technical advantages:

[0025] 1) Improving the wire drawing performance of the extruded material: By forming a first thread groove between the first spiral and the second spiral in the same cycle, and forming a second thread groove between the first spiral in the current cycle and the second spiral in the previous cycle, periodic changes in the extrusion pressure are achieved, so that the extruded material does not break during wire drawing in a feeding scenario with a high filler ratio. Among them, the present invention can better meet the extrusion requirements of materials with a high filler ratio. By adopting a screw rod design with two parallel spirals and a specific phase difference between the two spirals, the present invention can achieve periodic changes in the extrusion pressure, thereby improving the flow performance of materials with a high filler ratio.

[0026] 2) Optimizing the structure of the extrusion cavity: By jointly forming the extrusion cavity with the outer wall surface of the first screw rod, the outer wall surface of the second screw rod, and the inner wall surface of the extruder housing, the extruded material can be fully mixed and extruded in the cavity, improving the product quality.

[0027] 3) Improving the reliability and stability of the extrusion device: By reasonably matching the spiral on the first screw rod with the thread groove on the second screw rod, the cooperative work between the screw rods is achieved, making the extrusion device operate more smoothly and reliably.

[0028] 4) Adapting to extrusion scenarios with different requirements: By adjusting the diameters of the first thread groove and the second thread groove, different filler ratios and extrusion parameters can be flexibly selected according to specific application requirements to meet the requirements of different materials and products. Description of the Drawings

[0029] Figure 1 It is a schematic structural diagram of the screw rod for 3D printing in the present invention.

[0030] In the figure: 1, screw rod connection part; 2, screw rod main body; 3, screw rod end; 21, first spiral; 22, second spiral; 23, first thread groove; 24, second thread groove. Detailed Embodiments

[0031] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. Component models, material names, connection structures, control methods, algorithms and other features not clearly described in this technical solution are all considered to be common technical features disclosed in the prior art.

[0032] Example 1

[0033] The screw used for the 3D printing extrusion device in the present invention comprises a screw connecting part 1, a screw main body 2, and a screw end 3 connected in sequence, see Figure 1 .

[0034] The screw connecting part 1 is connected to the power output end of the 3D printing extrusion device by transmission; the screw body 2 is provided with a first spiral 21 and a second spiral 22 which are parallel to each other, and the size characteristics and period characteristics of the first spiral 21 and the second spiral 22 are the same, and the phase difference between the first spiral 21 and the second spiral 22 is 1 / 5 to 1 / 3 of the spiral period. The present invention can better meet the extrusion requirements of high filler ratio materials. By adopting a screw design with two parallel spirals and a specific phase difference between the two spirals, the present invention can achieve a periodic change in extrusion pressure, thereby improving the flow properties of high filler ratio materials. The phase difference of the two spirals in the screw design of the present invention can be adjusted according to the characteristics of the material, so that the high filler ratio material can obtain a more uniform force distribution during the extrusion process, reducing the broken wire and fracture phenomenon of the extruded material. In addition, in the specific implementation, the phase difference between the first spiral 21 and the second spiral 22 can be 1 / 4 to 1 / 3 of the spiral period, such as directly setting the phase difference between the first spiral 21 and the second spiral 22 to 1 / 3 of the spiral period under specific circumstances. The screw design of the present invention can effectively improve the flow properties of high filler ratio materials, make the extrusion process more stable, and reduce the occurrence of problems such as unsatisfactory wire drawing performance, wire breakage, and fracture, thereby improving the working efficiency and product quality of 3D printing extrusion equipment.

[0035] The first spiral 21 and the second spiral 22 in the same cycle form a first thread groove 23. The first spiral 21 in one cycle and the second spiral 22 in the previous cycle form a second thread groove 24. The diameter at the lowest point in the first thread groove 23 is 70-85% of the diameter of the spiral in the same axis. The diameter at the lowest point in the second thread groove 24 is 60-80% of the diameter of the spiral in the same axis. In addition, the diameter change of the two thread grooves in the screw design can further improve the extrusion performance of the material and avoid the phenomenon of poor extrusion and uneven flow caused by excessive restriction of the material.

[0036] The 3D printing extrusion equipment in the present invention includes an extruder housing, a power output assembly arranged in the extruder housing, a first screw connected to the first power output end of the power output assembly, and a second screw connected to the second power output end of the power output assembly. The first screw is the above-mentioned screw in the present invention, and the spiral on the second screw matches the spiral groove on the first screw; the outer wall surface of the first screw, the outer wall surface of the second screw, and the inner wall surface of the extruder housing together constitute an extrusion cavity. A spiral is provided on the first screw, and the first thread groove 23 and the second thread groove 24 on the first screw are matched with the spiral on the second screw to achieve periodic changes in the extrusion pressure, so that the wire drawing of the extruded material is continuous in the feeding scenario with a high filler ratio.

[0037] The 3D printing device in the present invention includes the above-mentioned 3D printing extrusion device.

[0038] The following aspects may be considered in the specific design and application of the 3D printing device in the present invention:

[0039] Preparation: First, load the material with a high filler ratio into the 3D printing device and set appropriate printing parameters, such as printing speed, temperature, etc.

[0040] Power output assembly transmission connection: The screw connection part is transmission-connected to the power output end of the 3D printing extruder, so that the screw can receive power from the power output assembly.

[0041] An extrusion screw design: using the special screw provided in the present invention, a first spiral and a second spiral parallel to each other are present on the main body of the screw, and their size characteristics and period characteristics are the same and have a specific phase difference.

[0042] Another extrusion screw design: Use a regular single-helix screw and simply match it with a twin-helix screw.

[0043] Extrusion cavity formation: The outer wall surface of the first screw and the second screw and the inner wall surface of the shell of the 3D printing extrusion device together constitute the extrusion cavity.

[0044] Extrusion process: The power transmitted by the power output assembly drives the screw to rotate. Since the two spirals on the screw have a specific phase difference, a periodically changing extrusion pressure is generated during the extrusion process.

[0045] Material extrusion: During the extrusion process, the material with a high filler ratio is pushed into the extrusion cavity and flows along the screw thread groove. Due to the shape of the thread groove and the phase difference design, the material is fully mixed and sheared in the screw to ensure uniform extrusion and flow performance of the material.

[0046] 3D printing: The extruded material enters the 3D printing platform through a nozzle or an extrusion outlet and is stacked according to a predetermined path and layer thickness to form a layer-by-layer printing process of an object.

[0047] The 3D printing device of the present invention can effectively extrude materials with a high filler ratio, improve the flow performance and wire drawing effect of the materials, thereby effectively improving the printing quality and printing efficiency.

[0048] The above description of the embodiments is to enable those of ordinary skill in the art to understand and use the invention. It is obvious that those who are familiar with the technology in this field can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative efforts. Therefore, the present invention is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A screw for a 3D printing extrusion device, characterized in that, It includes a screw connection part (1), a screw main body (2), and a screw end part (3) connected in sequence; The screw connection part (1) is in transmission connection with the power output end of the 3D printing extrusion device; On the screw main body (2), there are a first thread (21) and a second thread (22) that are parallel to each other. The dimensional characteristics and periodic characteristics of the first thread (21) and the second thread (22) are the same, and the phase difference between the first thread (21) and the second thread (22) is 1 / 5 to 1 / 3 of the thread period.

2. The screw for a 3D printing extrusion device according to claim 1, characterized in that, The phase difference between the first thread (21) and the second thread (22) is 1 / 4 to 1 / 3 of the thread period.

3. The screw for a 3D printing extrusion device according to claim 2, wherein, The phase difference between the first thread (21) and the second thread (22) is 1 / 3 of the thread period.

4. A screw for a 3D printing extrusion device according to claim 1, characterized in that, Between the first thread (21) and the second thread (22) in the same period, a first thread groove (23) is formed.

5. The screw for a 3D printing extrusion device according to claim 4, characterized in that, Between the first thread (21) in one period and the second thread (22) in the previous period, a second thread groove (24) is formed.

6. The screw for a 3D printing extrusion device according to claim 5, characterized in that, The diameter at the lowest point in the first thread groove (23) is 70% to 85% of the diameter of the coaxial upward thread.

7. A screw for a 3D printing extrusion device according to claim 5, characterized in that, The diameter at the lowest point in the second thread groove (24) is 60% to 80% of the diameter of the coaxial upward thread.

8. A 3D printing extrusion device, characterized in that, It includes an extruder housing, a power output assembly provided in the extruder housing, a first screw in transmission connection with the first power output end of the power output assembly, and a second screw in transmission connection with the second power output end of the power output assembly. The first screw is the screw according to any one of claims 1 to 7, and the thread on the second screw matches the thread groove on the first screw; The outer wall surface of the first screw, the outer wall surface of the second screw, and the inner wall surface of the extruder housing together form an extrusion cavity.

9. The 3D printing extrusion device according to claim 8, characterized in that, There is one thread on the first screw. The first thread groove (23) and the second thread groove (24) on the first screw cooperate with the thread on the second screw to realize the periodic change of the extrusion pressure, so that the drawn wire of the extruded material is continuous in the feeding scenario with a high filler ratio.

10. A 3D printing device, characterized in that, It includes the 3D printing extrusion device as described in claim 9.

Images