A pressure roller device, additive manufacturing equipment and additive manufacturing method

Abstract

The present invention belongs to the technical field related to additive manufacturing, and discloses a pressure roller device, additive manufacturing equipment and additive manufacturing method. The pressure roller device is suitable for on-orbit additive manufacturing in space, and includes multiple pressing mechanisms. The pressing mechanism includes a shell, multiple pressure roller beads and an elastic pressing component. The multiple pressure roller beads are rotatably connected to one end of the shell; one end of the elastic pressing component is connected to the other end of the shell, and the other end is detachably connected to the multiple pressure roller beads, and the elastic pressing component is accommodated in the shell; the elastic pressing component causes the pressure roller beads to move along the central axis of the shell to abut against the pressure roller beads or detach from the pressure roller beads through elastic deformation or recovery of elastic deformation, so that the pressure roller beads press the wire toward the component to be added or detach from the wire; when the pressure roller beads abut against the pressure roller beads, the pressure roller beads smooth the surface of the wire by rotating themselves. The present invention uses the combined action of the pressing mechanisms to compact the wire and the component to be added, and uses the pressure roller beads to smooth the surface of the material.

Description

Technical Field

[0001] The present invention belongs to the technical field related to additive manufacturing, and more specifically, relates to a pressure roller device, additive manufacturing equipment and additive manufacturing method. Background Art

[0002] In-orbit additive manufacturing technology in space is considered to have important strategic significance and strong exploratory potential in future space exploration due to its advantages such as on-demand design and on-site manufacturing. Fused deposition modeling (FDM) and electron beam fusion (EBF3) are the first choice for printing polymer and metal materials due to their simple structure and high space efficiency. Considering the complex application scenarios in space, it is necessary to develop additive manufacturing equipment that has the ability to print both metal and polymer parts. However, in microgravity and high vacuum environments, the stability of the formed parts and the mechanical properties of the materials will change to a certain extent, resulting in some differences between samples manufactured in space and those manufactured on the ground. Moreover, in a microgravity environment, the formation of non-equilibrium phases during the manufacturing process may also be affected.

[0003] Traditional 3D printing technology uses metal powder or metal wire as raw materials, and forms a molten pool by melting the material to achieve the stacking of manufacturing layers one by one. The connection between layers depends on the gravity of the liquid itself. However, in a gravity environment, the gravity sedimentation of the liquid disappears, and the liquid material is easily affected by surface tension to form a ball phenomenon, which affects the bonding strength between the material layers. At the same time, the liquid may float or soar when disturbed. Dust-like raw materials are also prone to floating and explosive, making them difficult to control, and their transportation and flow also face major challenges. In addition, the buoyancy of bubbles in the melt disappears in a microgravity environment, and defects such as pores are easily formed after solidification, affecting the quality of additive manufacturing. Summary of the Invention

[0004] In response to the above-mentioned defects or improvement needs of the prior art, the present invention provides a pressing roller device, additive manufacturing equipment and additive manufacturing method, which aim to solve the problem of low bonding strength between material layers.

[0005] To achieve the above-mentioned purpose, according to one aspect of the present invention, a pressure roller device is provided, which is suitable for on-orbit additive manufacturing in space, and the pressure roller device includes multiple pressing mechanisms, which include a shell, multiple pressure roller balls and an elastic pressing component, and the multiple pressure roller balls are rotatably connected to one end of the shell; one end of the elastic pressing component is connected to the other end of the shell, and the other end is detachably connected to the multiple pressure roller balls, and the elastic pressing component is accommodated in the shell; the elastic pressing component causes the pressure roller balls to move along the central axis of the shell to abut against or detach from the pressure roller balls through elastic deformation or recovery of elastic deformation, so that the pressure roller balls press the wire toward the component to be added or detach from the wire; when the pressure roller balls abut against the pressure roller balls, the pressure roller balls compact the wire and the component to be added under the action of the elastic force generated by the elastic pressing component, and flattens the surface of the wire by rotating itself.

[0006] Furthermore, the pressing mechanism also includes a pressure sensor, which is arranged on the housing and connected to one end of the elastic pressing component.

[0007] Furthermore, the shell includes a tail and a head connected to each other, the tail is columnar and the head is shower head-shaped; a plurality of mounting holes are formed on the end surface of the head away from the tail, and the mounting holes are used to accommodate the pressure roller beads; the pressure roller beads can rotate in the head and move up and down relative to the head along the central axis of the shell.

[0008] Furthermore, the elastic pressing assembly includes an elastic member and a pressing member, the elastic member is accommodated in the tail portion, and the pressing member is accommodated in the head portion; one end of the elastic member is connected to the pressure sensor, and the other end is connected to the pressing member.

[0009] Furthermore, the pressing mechanism also includes a plurality of mounting seats, which are used to support the pressing roller beads. The mounting seats are slidably arranged in the mounting holes and can move up and down relative to the mounting holes.

[0010] Furthermore, a mounting groove with an opening facing away from the shell is provided on the side of the mounting seat away from the head, the pressure roller bead is clamped in the mounting groove, and the pressure roller bead is partially located outside the mounting groove; the pressure roller bead can rotate relative to the mounting groove.

[0011] Furthermore, a plurality of balls are arranged between the pressure roller ball and the groove wall of the mounting groove, and the plurality of balls are distributed along the circumference of the mounting groove; a sliding structure is arranged between the mounting seat and the corresponding hole wall of the mounting hole, and the sliding structure includes a card groove and a card protrusion adapted for sliding connection, one of the card groove and the card protrusion is arranged on the outer wall of the mounting seat and extends in the up and down directions, and the other is arranged on the hole wall of the mounting hole.

[0012] Furthermore, the pressing member is tapered, and the area of ​​its cross section gradually increases from one end adjacent to the tail toward the other end; the pressing member can act on multiple pressing roller beads at the same time.

[0013] The present invention also provides an additive manufacturing device, which includes a substrate, a fused deposition modeling device, an electron beam fusion modeling device and two pressure roller devices as described above, wherein the substrate is used to carry the parts to be added; the fused deposition modeling device and the electron beam fusion modeling device are respectively arranged above the substrate at intervals, and the two pressure roller devices are respectively connected to the fused deposition modeling device and the electron beam fusion modeling device.

[0014] The present invention also provides an additive manufacturing method, which uses the additive manufacturing device as described above to perform additive manufacturing, and comprises the following steps:

[0015] S1, checking whether the pressing roller ball in the pressing mechanism is in a normal rotation state under a predetermined pressure, and adjusting it according to the detection result to ensure that the pressing roller ball can rotate normally under the predetermined pressure;

[0016] S2, confirming the pressing position of the shells of the two pressing roller devices;

[0017] S3, driving the fused deposition modeling device or the electron beam fusion modeling device to perform additive manufacturing on the component to be added, and using a corresponding pressing roller device to press the wire material onto the component to be added for flattening.

[0018] In general, compared with the prior art, the above technical solutions conceived by the present invention mainly have the following beneficial effects:

[0019] 1. The elastic pressing assembly moves the pressure roller bead along the central axis of the shell to abut against or detach from the pressure roller bead through elastic deformation or recovery of elastic deformation, so that the pressure roller bead presses the wire material toward the component to be added or detaches from the wire material. When the pressure roller bead abuts against the pressure roller bead, the pressure roller bead presses the wire material and the component to be added under the action of the elastic force generated by the elastic pressing assembly, and smoothes the surface of the wire material by rotating itself; in this way, in a vacuum and microgravity environment, through the joint action of multiple pressing mechanisms in the pressure roller device and the action of elastic force, the pressure roller bead presses the wire material and the component to be added, and smoothes the surface of the material by using the pressure roller bead, creating good morphological conditions for subsequent additive manufacturing and effectively solving the problem of low interlayer bonding strength of the material.

[0020] 2. In each of the pressing mechanisms, when the shell is forced to move downward and drives the lower pressing member to press down the multiple pressing roller beads, the elastic member is compressed and generates the elastic force, which acts on the multiple pressing roller beads through the lower pressing member, so that the multiple pressing roller beads act on the wire material, thereby compacting the wire material on the part to be added, and then the wire material is flattened by the rotation of the pressing roller beads.

[0021] 3. The pressing member is conical, and the area of ​​its cross section gradually expands from one end adjacent to the tail toward the other end; the pressing member can act on multiple pressing rollers at the same time, and the multiple pressing rollers are evenly stressed, which is beneficial to improving the compaction and leveling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of an additive manufacturing device provided by the present invention;

[0023] Figure 2 This is a structural schematic diagram of a pressing mechanism of a pressing roller device provided by the present invention;

[0024] Figure 3 yes Figure 2 A bottom view of the head of the housing of the pressing mechanism;

[0025] Figure 4 yes Figure 2 A schematic diagram of a portion of the structure of the housing of the pressing mechanism;

[0026] Figure 5 is a flow chart of an additive manufacturing method provided by the present invention;

[0027] Figure 6 yes Figure 5 Flowchart of step S2 of the additive manufacturing method.

[0028] In all the drawings, the same reference numerals are used to denote the same elements or structures, wherein: 10000-additive manufacturing equipment, 2000-substrate, 1000-pressing roller device, 3000-fused deposition modeling device, 100-pressing mechanism, 3100-first wire feeding mechanism, 1-housing, 3110-first wire reel, 11-tail, 3120-first pressing roller, 12-head, 3200-heater, 121-mounting hole, 3300-first nozzle , 2-pressure roller ball, 3310-wire outlet, 3-elastic pressing component, 4000-electron beam melting forming device, 31-elastic part, 4100-electron gun, 32-down pressure part, 4200-second wire feeding mechanism, 33-connecting part, 4210-second wire reel, 4-mounting seat, 4220-second pressure roller, 41-mounting groove, 4230-wire feeding head, 5-ball, 20000-first wire, 6-pressure sensor, 30000-second wire. DETAILED DESCRIPTION

[0029] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0030] Traditional 3D printing technology uses metal powder or metal wire as raw materials, and forms a molten pool by melting the material to achieve the stacking of manufacturing layers one by one. The connection between layers depends on the gravity of the liquid itself. However, in a microgravity environment, the gravity sedimentation of the liquid disappears, and the liquid material is easily affected by surface tension to form a ball phenomenon, which affects the bonding strength between the material layers. At the same time, the liquid may float or soar when disturbed, and the dust-like raw materials are also easy to float and explode, making them difficult to control, and their transportation and flow also face major challenges. In addition, the buoyancy of bubbles in the melt disappears in a microgravity environment, and defects such as pores are easily formed after solidification, affecting the quality of additive manufacturing.

[0031] See also Figure 2 、 Figure 3 and Figure 4The present invention provides a pressing roller device 1000, which includes a plurality of pressing mechanisms 100. The plurality of pressing mechanisms 100 are used to be distributed on the periphery of the nozzle along the circumference of the nozzle and are connected to the nozzle. The pressing mechanism 100 includes a shell 1, a plurality of pressing roller balls 2, an elastic pressing component 3 and a pressure sensor 6. The plurality of pressing roller balls 2 are rotatably connected to one end of the shell 1, and the pressure sensor 6 is arranged at the other end of the shell 1. One end of the elastic pressing component 3 is connected to the pressure sensor 6, and the other end is detachably connected to the plurality of pressing roller balls 2, and the elastic pressing component 3 is accommodated in the shell 1. The elastic pressing component 3 elastically deforms or recovers elastic deformation to move the pressing roller balls 2 along the central axis of the shell 1 to abut against or detach from the pressing roller balls 2, so that the pressing roller balls 2 press the wire material toward the part to be added or detach from the wire material. When the pressing roller bead 2 abuts against the pressing roller bead 2 , the pressing roller bead 2 compacts the wire material and the component to be added under the elastic force generated by the elastic pressing component 3 , and smoothes the surface of the wire material by rotating itself.

[0032] The housing 1 includes a connected tail portion 11 and a head portion 12. The tail portion 11 is cylindrical, and the head portion 12 is showerhead-shaped. The compression mechanism 100 is connected to the showerhead via the tail portion 11. The head portion 12 has a plurality of mounting holes 121 formed on the end surface facing away from the tail portion 11. These mounting holes 121 are configured to accommodate the pressure roller bead 2. The pressure roller bead 2 is capable of rotating within the head portion 12 and moving up and down relative to the head portion 12 along the central axis of the housing 1.

[0033] The elastic pressing assembly 3 includes an elastic member 31 and a pressing member 32, wherein the elastic member 31 is housed in the tail portion 11, and the pressing member 32 is housed in the head portion 12. One end of the elastic member 31 is connected to the pressure sensor 6, and the other end is connected to the pressing member 32. Under the action of the elastic member 31, the pressing member 32 moves toward the pressing roller bead 2 or away from the pressing roller bead 2 to abut against the pressing roller bead 2 or detach from the pressing roller bead 2, so that the pressing roller bead 2 compacts the wire material with the component to be added or separates the pressing roller bead 2 from the wire material. When the elastic member 31 is in a compressed state, it generates an elastic force, which acts on the pressing roller bead 2 through the pressing member 32, so that the pressing roller bead 2 moves along the central axis of the housing 1 toward the component to be added, so as to compact the wire material to the component to be added.

[0034] During use, multiple pressing mechanisms 100 are distributed on the periphery of the nozzle along the circumference of the nozzle. In each pressing mechanism 100, when the shell 1 is forced to move downward and drives the lower pressing member 32 to press down multiple pressing roller beads 2, the elastic member 31 is forced to be compressed and generates elastic force. The elastic force acts on the pressing roller beads 2 through the lower pressing member 32, so that the pressing roller beads 2 act on the wire material, thereby compacting the wire material on the component to be added, and then the wire material is flattened by the rotation of the pressing roller beads 2. In this way, in a vacuum and microgravity environment, through the joint action of multiple pressing mechanisms 100 in the pressing roller device 1000, the elastic force of the elastic member 31 is used to act on the pressing roller beads 2 to compact the wire material and the component to be added, and the pressing roller beads 2 are used to flatten the surface of the material, thereby creating good morphological conditions for subsequent additive manufacturing and effectively solving the problem of low interlayer bonding strength of the material.

[0035] There is no limit on the number of the pressing mechanisms 100, and there is no limit on the number of the pressing roller balls 2 in each of the pressing mechanisms 100. In one embodiment, there are six pressing mechanisms 100, and there are six pressing roller balls 2 in each of the pressing mechanisms 100.

[0036] The elastic member 31 may be a rubber strip or a spring. In this embodiment, the elastic member 31 is a spring. More specifically, the elastic member 31 is a linear spring, and the elastic force and deformation are in a linear relationship.

[0037] The pressing mechanism 100 also includes a plurality of mounting seats 4, which are used to support the pressure roller beads 2. The number of mounting seats 4 is the same as the number of pressure roller beads 2. The mounting seats 4 are slidably disposed within the mounting holes 121 and are capable of moving up and down relative to the mounting holes 121. The mounting seats 4 are provided with a mounting groove 41 on the side away from the head 12, with the opening facing away from the housing 1. The pressure roller beads 2 are clamped in the mounting groove 41, and the pressure roller beads 2 are partially located outside the mounting groove 41. The pressure roller beads 2 are capable of rotating relative to the mounting groove 41, so that the pressure roller beads 2 can move in the up and down directions through the movement of the mounting seats 4.

[0038] Multiple balls 5 are positioned between the pressure roller ball 2 and the wall of the mounting groove 41, distributed circumferentially around the mounting groove 41. The length of the opening of the mounting groove 41 is greater than the diameter of the pressure roller ball 2, but less than the sum of the diameter of the pressure roller ball 2 and the diameter of the two balls 5. Thus, the pressure roller ball 2 is rotatably mounted on the mounting seat 4 via the multiple balls 5.

[0039] In one embodiment, a sliding structure is provided between the mounting seat 4 and the corresponding hole wall of the mounting hole 121, and the sliding structure includes a card slot and a card protrusion adapted for sliding connection, one of the card slot and the card protrusion is provided on the outer wall of the mounting seat 4 and extends in the up and down directions, and the other is provided on the hole wall of the mounting hole 121, so that the mounting seat 4 can slide up and down relative to the head 12.

[0040] In one embodiment, the pressing member 32 is conical, and the area of ​​its cross section gradually expands from one end adjacent to the tail 11 toward the other end; the pressing member 32 can act on multiple pressing roller beads 2 at the same time, and the multiple pressing roller beads 2 are subjected to uniform force, which is beneficial to improving the compaction and leveling effect; the pressure sensor 6 is used to measure the elastic force generated when the elastic member 31 is compressed, and display it in real time.

[0041] The pressing roller device 1000 further includes at least one first driving member, which is drivingly connected to the pressing mechanism 100 to drive the pressing mechanism 100 to move up and down, thereby achieving the up and down movement of the housing 1.

[0042] See also Figure 1 The present invention further provides an additive manufacturing apparatus 10000, comprising a substrate 2000, a fused deposition modeling apparatus 3000, an electron beam melting and forming apparatus 4000, and two pressure roller devices 1000 as described above. The substrate 2000 is used to support a component to be added. The fused deposition modeling apparatus 3000 and the electron beam melting and forming apparatus 4000 are spaced apart and disposed above the substrate 2000, respectively. The two pressure roller devices 1000 are connected to the fused deposition modeling apparatus 3000 and the electron beam melting and forming apparatus 4000, respectively.

[0043] The melt forming device includes a first wire feeding mechanism 3100, a heater 3200 and a first nozzle 3300 arranged from top to bottom. The first wire feeding mechanism 3100 is used to feed the first wire 20000 into the heater 3200 for heating. The first nozzle 3300 is connected to the heater 3200 and has a wire outlet 3310 opposite to the substrate 2000. The wire outlet 3310 is used to allow the first wire 20000 heated by the heater 3200 to pass through.

[0044] The electron beam melting forming device 4000 and the fused deposition modeling device 3000 are spaced apart along a first direction, and include an electron gun 4100 and a second wire feeding mechanism 4200 disposed along the first direction on one side of the electron gun 4100. A second nozzle is disposed below the electron gun 4100, and the second nozzle is used to output the light beam emitted by the electron gun 4100. The second wire feeding mechanism 4200 is used to deliver the second wire 30000 to the intersection of the light beam and the substrate 2000. One of the two pressure roller devices 1000 is disposed between the first nozzle 3300 and the substrate 2000, and the other is disposed between the second nozzle and the substrate 2000.

[0045] The fused deposition modeling device 3000 and the electron beam fusion modeling device 4000 are coordinated and independent of each other, have the same working range, and share the same base plate 2000. In a vacuum, microgravity environment, whether the fused deposition modeling device 3000 or the electron beam fusion modeling device 4000 is used, the roller device 1000 is used to compact the filament and the part to be added, and the surface of the filament is smoothed, thereby improving the bonding force between the filament and the part to be added.

[0046] In one embodiment, the first wire feeding mechanism 3100 includes a first wire reel 3110 and two first pressure rollers 3120. The first wire reel 3110 is wound with the first wire material 20000. The two first pressure rollers 3120 are arranged between the first wire reel 3110 and the heater 3200, and abut against the opposite sides of the first wire material 20000 to jointly extrude the first wire material 20000. The two first pressure rollers 3120 can rotate relative to the first wire material 20000 to transport the first wire material 20000 to the heater 3200 for heating, and transport the heated first wire material 20000 to the wire outlet 3310 of the first nozzle 3300 for output.

[0047] The second wire feeding mechanism 4200 includes a second wire reel 4210, two second pressure rollers 4220 and a wire feeding head 4230. The second wire reel 4210 is wound with a second wire 30000. The two second pressure rollers 4220 are arranged between the second wire reel 4210 and the wire feeding head 4230, and abut against the opposite sides of the second wire 30000 to jointly extrude the second wire 30000. The two second pressure rollers 4220 can rotate relative to the second wire 30000 to transport the second wire 30000 to the wire feeding head 4230. The wire feeding head 4230 is arranged corresponding to the intersection of the light beam emitted by the electron gun 4100 and the substrate 2000.

[0048] The substrate 2000 can move relative to the fused deposition modeling apparatus 3000 and the electron beam deposition modeling apparatus 4000. The substrate 2000 can move in the vertical direction, the first direction, and the second direction. The vertical direction, the first direction, and the second direction are perpendicular to each other in a plane. The movement of the substrate 2000 can be achieved manually by an experimenter or by setting a driving device.

[0049] In one embodiment, the driving device includes a second driving member, a third driving member, and a fourth driving member. The second driving member is drivingly connected to the base plate 2000 and is used to drive the base plate 2000 to move up and down. The third driving member is drivingly connected to the base plate 2000 and is used to drive the base plate 2000 to move in the first direction. The fourth driving member is drivingly connected to the base plate 2000 and is used to drive the base plate 2000 to move in the second direction. The second, third, and fourth driving members can be drive motors, cylinders, electric push rods, etc.

[0050] See also Figure 5 The present invention also provides an additive manufacturing method, which uses the additive manufacturing device 10000 as described above to perform additive manufacturing, and mainly includes the following steps:

[0051] S1, checking whether the pressing roller ball 2 in the pressing mechanism 100 is in a normal rotation state under a certain pressure.

[0052] The material of the pressure roller beads 2 is selected based on the material of the component to be added, that is, the hardness of the pressure roller beads 2 in each pressure roller device 1000 is greater than the hardness of the component to be added. After each pressure roller device 1000 is assembled, the pressure roller device 1000 can be placed on a plane (or directly on the substrate 2000), and a certain pressure is applied to the pressure roller device 1000 to move the pressure roller beads 2 along the first direction or the second direction. The pressure roller beads 2 are observed to see whether they are in the normal rotation state, that is, whether they can rotate normally. If they are in the normal rotation state, the subsequent steps are carried out. If they cannot rotate normally, the pressure roller beads 2 are disassembled and reassembled.

[0053] S2, after confirming that the pressing roller ball 2 is in a normal rotation state, confirm the downward pressing position of the shells 1 of the two pressing roller devices 1000.

[0054] See also Figure 6 , the step S2 specifically includes:

[0055] Step S21: If each of the pressing roller beads 2 is in a normal rotation state, one of the two pressing roller devices 1000 is installed on the first nozzle 3300 of the fused deposition modeling device 3000, and the other is installed on the second nozzle of the electron beam melting modeling device 4000, and the outer shells 1 of the two pressing roller devices 1000 are respectively located at the initial position away from the substrate 2000.

[0056] Step S22: driving the housing 1 of the pressing roller device 1000 to move downward toward the substrate 2000 until the elastic member 31 in the pressing roller device 1000 is compressed to generate a first preset elastic force, and confirming the position of the housing 1, which is recorded as the downward pressing position.

[0057] Step S23: driving the substrate 2000 in the additive manufacturing device 10000 to move relative to the pressing roller device 1000 in a first direction to check whether the pressing roller ball 2 in the pressing roller device 1000 rotates normally. The first direction and the up-down direction are perpendicular to each other in a plane.

[0058] Step S24: If the pressure roller ball 2 rotates normally, drive the pressure roller device 1000 to move upward to the initial position; if the pressure roller ball 2 is stuck, drive the pressure roller device 1000 to move upward to the initial position, and repeat the above steps S22 and S23 until the pressure roller ball 2 rotates normally.

[0059] It should be noted that the pressing positions of the housing 1 in the two pressing roller devices 1000 are respectively determined according to the above steps S21 to S24.

[0060] S3, driving the fused deposition modeling device 3000 or the electron beam fusion modeling device 4000 to perform additive manufacturing on the component to be added, and using the corresponding pressing roller device 1000 to press the wire material onto the component to be added for flattening.

[0061] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A roller press device, suitable for on-orbit additive manufacturing in space, characterized by: The pressing roller device includes multiple pressing mechanisms, which include a shell, multiple pressing roller balls and an elastic pressing component, wherein the multiple pressing roller balls are rotatably connected to one end of the shell; one end of the elastic pressing component is connected to the other end of the shell, and the other end is detachably connected to the multiple pressing roller balls, and the elastic pressing component is accommodated in the shell; the elastic pressing component causes the pressing roller balls to move along the central axis of the shell to abut against or detach from the pressing roller balls through elastic deformation or recovery of elastic deformation, so that the pressing roller balls press the wire toward the component to be added or detach from the wire; when the pressing roller balls abut against the pressing roller balls, the pressing roller balls compact the wire and the component to be added under the action of the elastic force generated by the elastic pressing component, and flattens the surface of the wire by rotating itself.

2. The pressing roller device according to claim 1, wherein: The pressing mechanism further includes a pressure sensor, which is arranged on the housing and connected to one end of the elastic pressing component.

3. The pressing roller device according to claim 2, wherein: The shell includes a tail and a head connected to each other, the tail is columnar and the head is shower head-shaped; a plurality of mounting holes are formed on the end surface of the head away from the tail, and the mounting holes are used to accommodate the pressure roller beads; the pressure roller beads can rotate in the head and move up and down relative to the head along the central axis of the shell.

4. The pressing roller device according to claim 3, wherein: The elastic pressing assembly includes an elastic member and a pressing member, the elastic member is accommodated in the tail portion, and the pressing member is accommodated in the head portion; one end of the elastic member is connected to the pressure sensor, and the other end is connected to the pressing member.

5. The pressing roller device according to claim 3, wherein: The pressing mechanism further includes a plurality of mounting seats, which are used to carry the pressing roller beads. The mounting seats are slidably disposed in the mounting holes and can move up and down relative to the mounting holes.

6. The pressing roller device according to claim 5, characterized in that: A mounting groove with an opening facing away from the shell is provided on the side of the mounting seat away from the head. The pressure roller bead is clamped in the mounting groove, and the pressure roller bead is partially located outside the mounting groove; the pressure roller bead can rotate relative to the mounting groove.

7. The pressing roller device according to claim 6, characterized in that: A plurality of balls are arranged between the pressure roller ball and the groove wall of the mounting groove, and the plurality of balls are distributed along the circumference of the mounting groove; a sliding structure is arranged between the mounting seat and the corresponding hole wall of the mounting hole, and the sliding structure includes a card slot and a card protrusion adapted for sliding connection, one of the card slot and the card protrusion is arranged on the outer wall of the mounting seat and extends in the up and down directions, and the other is arranged on the hole wall of the mounting hole.

8. The pressing roller device according to claim 4, wherein: The pressing member is tapered, and the area of ​​its cross section gradually increases from one end adjacent to the tail toward the other end; the pressing member can act on a plurality of the pressing roller beads at the same time.

9. An additive manufacturing device, characterized in that: The additive manufacturing equipment includes a substrate, a fused deposition modeling device, an electron beam melting modeling device and two pressure roller devices according to any one of claims 1 to 8, wherein the substrate is used to carry the component to be additively manufactured; the fused deposition modeling device and the electron beam melting modeling device are respectively arranged above the substrate at intervals, and the two pressure roller devices are respectively connected to the fused deposition modeling device and the electron beam melting modeling device.

10. An additive manufacturing method, characterized in that: The additive manufacturing method is to perform additive manufacturing using the additive manufacturing device according to claim 9, and comprises the following steps: S1, checking whether the pressing roller ball in the pressing mechanism is in a normal rotation state under a predetermined pressure, and adjusting it according to the detection result to ensure that the pressing roller ball can rotate normally under the predetermined pressure; S2, confirming the pressing position of the shells of the two pressing roller devices; S3, driving the fused deposition modeling device or the electron beam fusion modeling device to perform additive manufacturing on the component to be added, and using a corresponding pressing roller device to press the wire material onto the component to be added for flattening.

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