WO2023240940A1

WO2023240940A1 - Rotary extrusion device, and composite additive manufacturing system and method

Info

Publication number: WO2023240940A1
Application number: PCT/CN2022/136104
Authority: WO
Inventors: 毕贵军; 陈立佳; 曹立超; 张理
Original assignee: 广东省科学院智能制造研究所
Priority date: 2022-06-16
Filing date: 2022-12-02
Publication date: 2023-12-21
Also published as: CN115007881A

Abstract

The present invention relates to the technical field of machining. Provided are a rotary extrusion device, and a composite additive manufacturing system and method. The device comprises a rotary extrusion head and a driving mechanism connected to the rotary extrusion head, wherein the rotary extrusion head comprises a connecting shaft, a shaft seat, and an extrusion head, one end of the connecting shaft being connected to the extrusion head, the shaft seat extending outwards around a circumferential direction of the connecting shaft, the connecting shaft being provided with a step section, the step section being close to the extrusion head, and an end surface of the step section being connected to a broadening portion of the extrusion head which extends outwards; and the driving mechanism comprises a rotary driving unit, the rotary driving unit being connected to the connecting shaft so as to drive the extrusion head to rotatably extrude a material. According to the present invention, the problem of the structure and size of the material being damaged after a large amount of deformation is used is solved, the process is simple, the cost is low, and a preferred orientation of the material is eliminated by means of the rotary extrusion device, so that the resulting additive manufacturing material and the corresponding member have the characteristics of a fine grain, a uniform structure, no anisotropy and good mechanical properties of the material.

Description

Rotary extrusion device, composite additive manufacturing system and method

Technical field

The present invention relates to the field of mechanical processing technology, and specifically to a rotary extrusion device, a composite additive manufacturing system and a method.

Background technique

Because additive manufacturing technology can use different energy sources to melt materials and is not limited by factors such as the melting point of the material, it has high advantages in the field of preparing special-shaped materials. Most additive manufacturing technologies use the method of depositing materials layer by layer. After the material is formed, the microstructure will form a preferential orientation along the deposition direction, causing the material to be anisotropic and affecting the performance of the material. In traditional preparation technology, in order to reduce or eliminate the anisotropy of materials, the materials are mainly subjected to post-processing methods such as rolling and heat treatment. The post-processing method of rolling can use large deformation to destroy the internal structure of the material and eliminate the preferred orientation. The performance of the material can often be improved with appropriate heat treatment processes. However, for special-shaped materials prepared by additive manufacturing technology, post-processing with large deformation will destroy the structure, size, etc. of the special-shaped materials. This post-processing method is not suitable for additive manufacturing materials. In view of the characteristics of additive manufacturing technology, the existing micro-forging technology uses special processing equipment to perform conformal micro-area forging of deposited materials, thereby improving the performance of the material. Although this technology has a significant effect on improving the structure and performance of additive manufacturing materials, it has high equipment requirements, complex processing conditions, high manufacturing costs, and is difficult to be promoted and used on a large scale.

Contents of the invention

The problem solved by the invention is to solve the problems of complex preparation process, expensive manufacturing equipment and high cost when modifying special-shaped materials in additive manufacturing.

In order to solve the above problems, the present invention provides a rotary extrusion device for composite additive manufacturing, including a rotary extrusion head and a driving mechanism connected to the rotary extrusion head. The rotary extrusion head includes a connecting shaft, An axle seat and an extrusion head. One end of the connecting shaft is connected to the extrusion head. The axle seat extends outwardly around the circumferential direction of the connecting shaft. A step section is provided on the connecting shaft. The step section is arranged close to the extrusion head, and the end surface of the step section is connected to the outwardly extending broadened portion of the extrusion head; the drive mechanism includes a rotation drive unit, and the rotation drive unit is connected to the extrusion head. The connecting shaft is connected to drive the extrusion head to rotate and extrud the material.

Further, the extrusion head includes an extrusion end portion, and the extrusion end portion is smooth.

Further, a guide groove is provided on the extrusion end, and the guide groove cooperates with the rotation drive unit to drive the guide groove to guide the material to the center of the extrusion end during rotation. .

Further, the guide groove includes a threaded groove and/or a cross groove.

The advantage of the rotary extrusion device of the present invention over the prior art is that the present invention connects the driving mechanism and the extrusion head through a connecting shaft to drive the extrusion head, and realizes the connection and positioning of the connecting shaft through the shaft seat. Improve the connection stability between the connecting shaft and the driving mechanism; the step section is arranged close to the extrusion head, and the end surface of the step section is connected to the outwardly extending broadened portion of the extrusion head, which is beneficial to the passage from the driving mechanism through the connecting shaft to the extrusion head. The conduction of the extrusion force improves the stability of the device; the rotation drive unit is connected to the connecting shaft to drive the extrusion head to rotate and extrud the material in the composite additive manufacturing process, achieving small deformation in the composite additive manufacturing process. Processing is conducive to eliminating the preferred orientation of materials and corresponding components, refining the organizational structure of materials and corresponding components, and improving the mechanical properties of materials and corresponding components.

The invention also provides a composite additive manufacturing system, which includes the rotary extrusion device and a material melting device. The material melting device includes a cladding head and a material supply mechanism. The cladding head is used to melt the The material supplied by the material supply mechanism, the rotary extrusion head of the rotary extrusion device is used to rotary extrusion of the melted material.

Further, the material includes at least one of pure metal, alloy, and metal matrix composite material containing reinforcing materials.

Further, the composite additive manufacturing system also includes a CNC machine tool and a milling head, and the CNC machine tool is connected to the rotating extrusion device, the cladding head and/or the milling head respectively; or it also includes a single /Dual robots, the single/double robots are respectively connected to the rotary extrusion device, the cladding head and/or the milling head.

The advantage of the composite additive manufacturing system of the present invention over the existing technology is that the present invention introduces a rotary extrusion device into the composite additive manufacturing system and cooperates with the material melting device to supply the melted material through the cladding head The material supplied by the mechanism, the rotating extrusion head of the rotating extrusion device rotates and extrudes the melted material to achieve additive manufacturing, ensuring a near-net shape in the composite additive manufacturing process and avoiding the destruction of the material structure after using large deformations. and size problems, and the equipment of the present invention has a simple structure, convenient processing, and low cost. The materials processed by the composite additive manufacturing system are conducive to eliminating the preferred orientation of the materials, and make the materials and corresponding components have the characteristics of fine grains, uniform structure, no anisotropy, and excellent material mechanical properties.

The invention also provides a composite additive manufacturing method, which performs composite additive manufacturing according to the composite additive manufacturing system, including the following steps:

Use a material melting device to melt and deposit the material;

The deposited layer of the material is subjected to rotary extrusion processing by a rotary extrusion device;

Repeat the above steps until the composite additive manufacturing material is obtained.

Further, the rotary extrusion processing of the deposited layer of the material includes:

After smoothing the surface of the deposited layer of the material, a rotary extrusion head with a smooth extrusion end is used for rotary extrusion;

Alternatively, a rotary extrusion head with a guide groove structure may be directly used to perform rotary extrusion on the surface of the deposition layer of the material.

Further, the pressure range during the rotary extrusion is 200-12000N, and the rotation speed is 1000-20000r/min.

The advantage of the composite additive manufacturing method of the present invention over the existing technology is that the present invention achieves a multi-dimensional material structure with small deformation by rotating and extruding the deposition layer of the material during the deposition process of the composite additive manufacturing. The adjustment retains the one-time near-net shape of the composite additive manufacturing material, and avoids the problem of damaging the material structure and size after large deformation in traditional manufacturing methods. The process is simple and the cost is low. The present invention adopts the method along the additive manufacturing process. The deposited layer is rotated and extruded, eliminating the preferred orientation of the material, so that the resulting additive manufacturing materials and corresponding components have the characteristics of fine grains, uniform structure, no anisotropy, and excellent material mechanical properties.

Description of the drawings

Figure 1 is a schematic structural diagram of a composite additive manufacturing system including dual robots in an embodiment of the present invention;

Figure 2 is a schematic structural diagram of a smooth rotating extrusion head in an embodiment of the present invention;

Figure 3 is a schematic structural diagram of a rotary extrusion head with guide grooves in an embodiment of the present invention;

Figure 4 is a schematic diagram 2 of the structure of a rotary extrusion head with guide grooves in an embodiment of the present invention;

Figure 5 is a structural schematic view three of a rotary extrusion head with guide grooves in an embodiment of the present invention;

Figure 6 is a three-dimensional structural view of a rotary extrusion head with guide grooves in an embodiment of the present invention;

Figure 7 is an EBSD diagram of the extruded sample in Example 1 of the present invention;

Figure 8 is an EBSD diagram of the unextruded sample in Example 1 of the present invention;

Figure 9 is an SEM image of the extruded sample in Example 2 of the present invention;

Figure 10 is an SEM image of the unextruded sample in Example 2 of the present invention;

Figure 11 is a schematic structural diagram of a composite additive manufacturing system including a CNC machine tool in an embodiment of the present invention;

Figure 12 is a schematic structural diagram of a composite additive manufacturing system including a single robot in an embodiment of the present invention.

Explanation of reference symbols:

1-Rotating extrusion head; 11-Connecting shaft; 12-Axis seat; 13-Extrusion head; 131-Extrusion end; 132-Threaded groove; 133-Cross groove; 14-Step section; 2- Cladding head; 3-Additive manufacturing materials; 4-Robot; 5-CNC machine tools.

Detailed ways

In order to make the above objects, features and advantages of the present invention more obvious and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

It should be noted that in the description of the embodiments of this application, the term "some specific embodiments" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one implementation of the present invention. example or examples. In this specification, schematic representations of the above terms do not necessarily refer to the same implementation or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

As shown in Figures 1 to 5, embodiments of the present invention provide a rotary extrusion device for composite additive manufacturing, including a rotary extrusion head and a driving mechanism connected to the rotary extrusion head. The rotary extrusion head includes a connection The shaft, the shaft seat and the extrusion head, one end of the connecting shaft is connected to the extrusion head, the shaft seat extends outward around the circumference of the connecting shaft, the connecting shaft is provided with a step section, and the step section is set close to the extrusion head, and The end surface of the step section is connected to the outwardly extending broadened portion of the extrusion head; the driving mechanism includes a rotary drive unit, which is connected to the connecting shaft to drive the extrusion head to rotate and extrud the material.

The embodiment of the present invention connects the driving mechanism and the extrusion head through a connecting shaft to drive the extrusion head, and realizes the connection and positioning of the connecting shaft through the shaft seat, thereby improving the connection stability between the connecting shaft and the driving mechanism; the step section is close to the extrusion head The head is installed, and the end face of the step section is connected to the outwardly extending broadened part of the extrusion head, which is beneficial to the transmission of the extrusion force from the driving mechanism to the extrusion head through the connecting shaft, and improves the stability of the device; the rotation drive unit is connected with the extrusion head. The connecting shaft is connected to drive the extrusion head to realize rotational extrusion of materials in the composite additive manufacturing process, and realize small deformation processing in the composite additive manufacturing process, which is conducive to eliminating the preferred orientation of materials and corresponding components and refining materials. and the organizational structure of corresponding components, and improve the mechanical properties of materials and corresponding components.

Specifically, as shown in Figure 1, the rotary drive unit includes a high-speed rotating spindle. The high-speed rotating spindle is connected to a connecting shaft. The connecting shaft has an end face diameter close to the high-speed rotating spindle that is smaller than an end face diameter close to the axis seat. The connection shaft is similar to High-speed rotating spindle plug-in. The setting of the shaft seat limits the connection position between the high-speed rotating spindle and the connecting shaft. In this embodiment, the step section is arranged around the end of the connecting shaft close to the extrusion head. The step section includes a tapered section. In this embodiment, the outwardly extending broadened portion of the extrusion head means that the extrusion head is connected to the connection shaft along the As shown in Figures 2 to 5, the connection between the stepped section and the broadened section is beneficial to the stability of the force transmission between the end of the connecting shaft and the extrusion head.

In some specific embodiments, as shown in Figure 2, the extrusion head includes an extrusion end, and the extrusion end is smooth. Therefore, when the material is rotated and extruded, the smooth surface is conducive to uniform stirring of the material. Reduce frictional resistance. Optionally, the shape of the extrusion end can be a flat or arc surface. Therefore, according to the material deformation requirements, a rotating extrusion head with a flat or arc surface can be selected to achieve flexible extrusion.

In some specific embodiments, a guide groove is provided on the extrusion end, and the guide groove cooperates with the rotation drive unit to drive the guide groove to guide the material to the center of the extrusion end during rotation.

Specifically, as shown in Figures 3 to 5, the structure of the guide groove in this embodiment is not specifically limited. Any structure with a material guiding function can be used, combined with the direction of rotation, to realize the material moving towards the extrusion end. Move to obtain full extrusion, which is conducive to the homogenization of the material structure. In some preferred embodiments, the guide groove includes a threaded groove or a cross groove or a combination of a threaded groove and a cross groove. The structure is simple and clear, easy to process, and has good material guiding effect.

In some specific embodiments, the material used for the rotary extrusion head includes one of metal, ceramic, and composite materials. Therefore, there is no specific restriction on the material of the rotary extrusion head, and it can be replaced according to specific needs, which is conducive to matching the corresponding additive manufacturing materials and improving the efficiency of rotary extrusion.

Embodiments of the present invention also provide a composite additive manufacturing system, which includes a rotary extrusion device and a material melting device. The material melting device includes a cladding head and a material supply mechanism. The cladding head is used to melt the material supplied by the material supply mechanism. , the rotary extrusion head of the rotary extrusion device is used to rotary extrusion of the molten material.

As shown in Figure 1, the embodiment of the present invention introduces a rotary extrusion device into the composite additive manufacturing system and cooperates with the material melting device to melt the material supplied by the material supply mechanism through the cladding head. The rotation of the rotary extrusion device The extrusion head rotates and extrudes the melted material to realize additive manufacturing, ensuring that the composite additive manufacturing process is nearly net formed at one time, avoiding the problem of destroying the material structure and size after large deformation, and the equipment structure of the present invention Simple, easy to process and low cost. The materials processed by the composite additive manufacturing system are conducive to eliminating the preferred orientation of the materials and corresponding components, and make the materials and corresponding components have the characteristics of fine grains, uniform structure, no anisotropy, and excellent material mechanical properties.

Specifically, the cladding head in this embodiment is combined with an energy source. The energy source can be one or any combination of laser, electron beam, plasma, and arc to clad the material. The supply methods of the material supply mechanism include powder feeding type or powder spreading type.

This embodiment simplifies the additive manufacturing device and the material deformation device, eliminating the need for specialized material deformation devices, such as forging, rolling and other larger devices, thereby saving costs. Combining the rotary extrusion device with the material melting device for composite additive manufacturing can realize the adjustment of the material structure from the preparation process to the end of the preparation. Unlike traditional equipment, which can only adjust the material structure after the end of the additive manufacturing process, Adjustment. Compared with the passive adjustment after additive manufacturing in the prior art, the material structure adjustment during the process of the embodiment of the present invention has absolute advantages. Therefore, the composite additive manufacturing system described in the embodiments of the present invention does not destroy the structure and size of the material without affecting the advantages of one-time net shaping. At the same time, it also eliminates the preferred orientation of the material and makes the material have fine grains and structure. Uniform and non-anisotropic, it greatly improves the mechanical properties of the material.

In some specific embodiments, the material includes at least one of pure metals, alloys, and metal matrix composites containing reinforcing materials. The reinforcing material includes at least one of carbide, nitride, boride and oxide. Since the wide selection of energy sources is conducive to material processing, the applicable materials are relatively wide, which is conducive to the manufacture of various composite additive manufacturing materials.

In some specific embodiments, the composite additive manufacturing system also includes a CNC machine tool 5 and a milling head. The CNC machine tool 5 is connected to a rotating extrusion device, a cladding head and/or a milling head respectively; or it also includes a single/double robot. , single/double robots are connected to the rotating extrusion device, cladding head and/or milling head respectively.

As shown in Figure 1, the composite additive manufacturing system in this embodiment adopts a rotating extrusion device and a cladding head installed on the CNC machine tool 5 or the mechanical arm of a single/double robot. As shown in Figure 1, the composite additive manufacturing system realizes composite additive manufacturing. Material manufacturing. When installed on the mechanical arm of a single/double robot, the moving speed of the rotating extrusion head is controlled so that the moving speed ranges from 1-100mm/s. The moving speed can also be adjusted according to material requirements. This embodiment reduces the manufacturing cost of the composite additive manufacturing system by combining with existing devices, expands the application scenarios of the composite additive manufacturing system, and is conducive to the intelligence and scale of the composite additive manufacturing process.

Embodiments of the present invention also provide a composite additive manufacturing method, which performs composite additive manufacturing according to a composite additive manufacturing system, including the following steps:

Use a material melting device to melt and deposit the material;

The deposited layer of material is rotary extruded through a rotary extrusion device;

Embodiments of the present invention utilize the composite additive manufacturing system to perform rotational extrusion of the deposited layer of material during the deposition process of composite additive manufacturing, thereby achieving multi-dimensional material organization adjustment with small deformation and retaining the near-field properties of the composite additive manufacturing material. Net shaping avoids the problem of destroying the material structure and size after large deformation in traditional manufacturing methods. The process is simple and the cost is low. The invention eliminates the need for materials and corresponding materials by rotating and extruding along the deposition layer during the additive manufacturing process. The preferred orientation of the components enables the resulting additive manufacturing materials and corresponding components to have the characteristics of fine grains, uniform structure, no anisotropy, and excellent material mechanical properties.

Specifically, the materials in this embodiment refer to materials that can be used for additive manufacturing, and the form of the materials includes at least one of powder, silk, slurry and paste materials. The above material is melted and deposited, wherein the energy source used for melting includes at least one of laser, electron beam, plasma and arc, and then the deposited layer of material is subjected to rotational extrusion processing. The deposited layer here can be a The layer can also be multiple layers. One layer of material can be deposited and then rotated and extruded, or multiple layers can be deposited and then rotated and extruded. The rotation and extrusion operation can be performed according to the performance requirements of the material. As a result, meticulous rotational extrusion of materials layer by layer is conducive to refining grains, eliminating anisotropy, and improving the controllability of material properties during the composite additive manufacturing process.

In some specific embodiments, performing rotational extrusion processing on the deposited layer of material includes:

After smoothing the surface of the deposited layer of the material, a rotating extrusion head with a smooth extrusion end is used for rotational extrusion;

Alternatively, a rotating extrusion head with a guide groove structure is directly used to rotate and extrudate the surface of the deposition layer of the material.

In this embodiment, rotational extrusion processing is performed according to the characteristics and deposition conditions of the required additive manufacturing materials. Specifically, the surface of the deposition layer is first smoothed by a flattening tool, and then rotational extrusion is performed by a rotating extrusion head. That is, the planarization treatment can be milling or cutting the surface of the deposited layer through a milling head or a cutting knife, so that the surface of the deposited layer meets the planarization requirements before rotation and extrusion. Alternatively, for those that require refinement, a rotating extrusion head with a micro-cutting structure can be directly used to rotate and extrude the surface of the deposition layer of the material, which reduces the processing steps and uses the micro-cutting structure of the extrusion surface to make the rotation and extrusion easier. The material flows in the direction of extrusion, which increases the plastic deformation of the material. It also helps to refine the grains and change the preferred orientation of additive manufacturing, so that the material has better mechanical properties.

In some specific embodiments, the pressure range during rotational extrusion is 200-12000N, and the rotation speed is 1000-20000r/min.

Specifically, the pressure and rotation speed during rotational extrusion in this embodiment can be adjusted according to the material. For lightweight materials such as aluminum, copper, and magnesium, the predetermined extrusion effect can be achieved with smaller extrusion pressure and rotation speed; while for hard materials such as iron-based, nickel-based, and cobalt-based materials, larger extrusion pressure is required. Only by adjusting the pressing force and rotation speed can the predetermined extrusion effect be achieved. Therefore, the rotation speed and the extrusion pressure are matched. According to the material characteristics, appropriate rotation extrusion parameters are selected to efficiently realize the extrusion deformation of the material and achieve the required predetermined extrusion effect.

Example 1

This embodiment uses a composite additive manufacturing system and method to perform additive manufacturing. The details are as follows:

(1) As shown in Figure 1 and Figure 3, one of the two robots is used to connect the cladding head, and combined with the material supply mechanism to perform laser additive manufacturing of 316L stainless steel, and deposit 1mm of material; (2) On the other Install a cutting head on the robot to smoothen the surface of the additive manufacturing sample; (3) Remove the cutting head, replace it with a rotating extrusion head with a smooth extrusion surface, and perform rotational extrusion on the surface of the additive manufacturing sample; ( 4) Repeat the above steps on the extruded sample surface until the sample deposition height reaches 5mm to obtain the required additive manufacturing material. Among them, the rotation speed of the rotary extrusion head is 4000r/min, and the pressure value of the rotary extrusion head is 400N; the material supply method adopts powder feeding type, and the energy source of the cladding head to melt the material is laser.

Compared with the additively manufactured samples that did not use the composite additive manufacturing system for rotational extrusion, in terms of microstructure and mechanical properties, as shown in Figures 7 and 8, the extruded samples did not have obvious preferred orientation, which was different from Compared with the unextruded sample, the structure of the extruded sample is more uniform. The yield strength of the unextruded sample along the XY direction is 428MPa, and the yield strength in the XZ direction is 356MPa; the yield strength of the extruded sample along the XY direction is 457MPa, and the yield strength in the XZ direction is 435MPa, and the anisotropy is significantly improved.

Example 2

(1) As shown in Figures 4 to 6 and 12, AlCrFeNiV high-entropy alloy is additively manufactured through the cladding head connected to the robot, with a deposition height of about 1mm; (2) Remove the cladding head, install the electric spindle and Install a rotating extrusion head with a guide groove on the top of the electric spindle; (3) Rotate the surface of the additive manufacturing sample; (4) Repeat the above steps on the extruded sample surface until the sample deposition height reaches 5 mm, and obtain The required AlCrFeNiV high entropy alloy. Among them, the rotation speed of the rotary extrusion head is 7000r/min, and the pressure value of the rotary extrusion head is 800N; the material supply method adopts powder feeding type, and the energy source of the cladding head to melt the material is laser.

Compared with the additively manufactured samples that were not rotated and extruded by the composite additive manufacturing system, in terms of microstructure and mechanical properties, as shown in Figures 9 and 10, the extruded samples were compared with the non-extruded samples. The cell-like structure has obviously become smaller. The yield strength of the unextruded sample along the XY direction is 352MPa, and the yield strength of the extruded sample along the XY direction is 405MPa. The strength is significantly improved.

Example 3

(1) As shown in Figure 4 to Figure 6 and Figure 11, install the cladding head on the CNC machine tool 5 for additive manufacturing, with a deposition height of about 1mm; (2) Remove the cladding head, install the electric spindle and place it on the electric spindle. A rotating extrusion head with a guide groove is installed on the top of the spindle; (3) Rotary extrusion is performed on the surface of the additive manufacturing sample; (4) Repeat the above steps on the extruded sample surface until the sample deposition height reaches 5mm, and CoCrNi medium is obtained Entropy alloy sample. Among them, the rotation speed of the rotary extrusion head is 10000r/min, and the pressure value of the rotary extrusion head is 900N; the material supply method adopts powder feeding type, and the energy source of the cladding head to melt the material is laser. The yield strength of the CoCrNi medium-entropy alloy prepared by this method along the XY direction is 655MPa, which is within the excellent range of the strength of CoCrNi alloys in the prior art.

Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the disclosure of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

A rotary extrusion device for composite additive manufacturing, characterized in that it includes a rotary extrusion head (1) and a driving mechanism connected to the rotary extrusion head (1). The rotary extrusion head (1) ) includes a connecting shaft (11), a shaft seat (12) and an extrusion head (13). One end of the connecting shaft (11) is connected to the extrusion head (13), and the shaft seat (12) surrounds The connecting shaft (11) extends outward in the circumferential direction, the connecting shaft (11) is provided with a stepped section (14), the stepped section (14) is provided close to the extrusion head (13), and The end surface of the step section (14) is connected to the outwardly extending broadened portion of the extrusion head (13); the driving mechanism includes a rotary drive unit, and the rotary drive unit is connected to the connecting shaft (11). It is connected to drive the extrusion head (13) to rotate and extrud the material.
The rotary extrusion device according to claim 1, characterized in that the extrusion head (13) includes an extrusion end portion (131), and the extrusion end portion (131) is smooth.
The rotary extrusion device according to claim 2, characterized in that the extrusion end (131) is provided with a guide groove, the guide groove cooperates with the rotary drive unit and is used to drive the rotary extruder during rotation. The guide groove guides the material to the center of the extrusion end (131).
The rotary extrusion device according to claim 3, characterized in that the guide groove includes a thread-shaped groove (132) and/or a cross groove (133).
A composite additive manufacturing system, characterized in that it includes the rotary extrusion device according to any one of claims 1 to 4, and also includes a material melting device, the material melting device includes a cladding head (2) and Material supply mechanism, the cladding head (2) is used to melt the material supplied by the material supply mechanism, and the rotary extrusion head (1) of the rotary extrusion device is used to rotary extrusion of the melted material. .
The composite additive manufacturing system according to claim 5, wherein the material includes at least one of pure metal, alloy, and metal matrix composite material containing reinforcing materials.
The composite additive manufacturing system according to claim 5, further comprising a CNC machine tool (5) and a milling head, the CNC machine tool (5) being connected to the rotary extrusion device and the cladding head ( 2) and/or the milling head is connected; or it also includes a single/double robot (4), the single/double robot (4) is respectively connected with the rotating extrusion device, the cladding head (2) and the /or the milling head is connected.
A composite additive manufacturing method, characterized in that composite additive manufacturing is performed according to the composite additive manufacturing system according to any one of claims 5 to 7, including the following steps:

Use a material melting device to melt and deposit the material;

The deposited layer of the material is subjected to rotary extrusion processing by a rotary extrusion device;

Repeat the above steps until the composite additive manufacturing material is obtained.
The composite additive manufacturing method according to claim 8, wherein the rotary extrusion processing of the deposited layer of material includes:

After smoothing the surface of the deposited layer of the material, a rotary extrusion head (1) with a smooth extrusion end (131) is used for rotary extrusion;

Alternatively, a rotary extrusion head (1) with a guide groove structure may be directly used to perform rotary extrusion on the surface of the deposition layer of the material.
The composite additive manufacturing method according to claim 9, characterized in that the pressure range during rotation and extrusion is 200-12000N, and the rotation speed is 1000-20000r/min.