A dual-stirring head friction stir additive manufacturing device with auxiliary cooling

Abstract

The present invention provides a double-stirring head friction stir additive manufacturing device with auxiliary cooling, comprising: a powder feeding assembly, comprising a storage box, an impeller connected to the storage box through a bellows, a pump body arranged on the outside of the impeller, a flow controller connected to the pump body, and a powder conveying pipe connected to the flow controller; a stirring assembly, comprising a main shaft, a funnel arranged above the main shaft, a sealing cover arranged on the funnel and connected to the powder conveying pipe, a powder feeding shaft arranged inside the main shaft, a shaft shoulder arranged at the bottom of the main shaft, and a stirring head arranged at the bottom of the shaft shoulder; an auxiliary cooling assembly, comprising a water pump, a radiator, a roller, a first coolant pipe connecting the water pump and the roller, a second coolant pipe connecting the roller and the radiator, and a third coolant pipe connecting the radiator and the water pump; an installation and connection assembly, comprising a first box body for installing the stirring assembly and the pump body, a second box body for installing the auxiliary cooling assembly, and a connecting plate for installing the first box body and the second box body and connecting to the outside.

Description

Technical Field

[0001] The present invention belongs to the field of friction stir welding / additive manufacturing, and in particular relates to a double-stirring head friction stir additive manufacturing device with auxiliary cooling. Background Art

[0002] With the development of manufacturing and economy, additive manufacturing technology has achieved relatively rapid development in the industrial field. Friction stir additive manufacturing technology is a new type of solid-phase additive manufacturing technology. This technology uses solid-phase stir friction deposition to add materials by conveying plates, rods or powders. It has high material utilization and good molding controllability. Compared with melt additive manufacturing technology, stir friction additive does not involve the melting and solidification of metals, and can effectively reduce the defects of melt additives and obtain microstructures with good performance. During the additive process, the mechanical stirring and friction between the stirring head and the material generate a large amount of heat, causing the material to undergo plastic deformation, and the additive material is connected to the parent material through the extrusion of the shoulder to complete the solid-phase additive process. It has the advantages of low processing cost, short cycle time and high raw material utilization, and has been used in many fields such as aerospace, biomedicine, and rail transportation.

[0003] At present, friction stir additive manufacturing has become one of the research hotspots in the field of advanced forming manufacturing at home and abroad. Common friction stir additive manufacturing technologies include the following three categories: Friction Stir Additive Manufacturing (FSAM), which uses sheet materials as materials and is based on the principle of friction stir welding to stack them layer by layer for additive manufacturing; Additive Friction Stir Deposition (AFSD), which uses powder or wire as materials and is extruded through a hollow stirring head for additive manufacturing; and Friction Surfacing Deposition Additive Manufacturing (FSD-AM), which uses consumable rods as materials and forms additive layers by friction on the rod surface.

[0004] FSAM, which uses sheet materials, can avoid problems such as pores, cracks, and alloy burnout during melt additive manufacturing. However, it also presents issues such as weak connections between additive layers, low material utilization, large subtractive processing volumes, and low efficiency. FSD-AM technology places high demands on consumable rods; rods that are too large or too small will affect molding efficiency and also place high demands on machine tools. AFSD, which uses metal powder and wire as raw materials, deposits uniform additive layers with no significant interlayer interface defects, resulting in excellent component forming performance. It also offers the advantages of high additive efficiency and low energy consumption.

[0005] However, AFSD has high requirements for additive equipment. Although the existing stirring head structure can realize the process of friction extrusion and rotational stirring, its stirring is not sufficient, and the powder material is easy to splash. The powder in the middle bonding area of ​​the stirring head is difficult to enter, resulting in low additive efficiency and high material waste. Some stirring heads are designed with cooling cavities on the outer shell to prevent the high temperature generated by heating from being transferred upward, but the heat of the processed surface will also have a thermal impact on the unprocessed surface, resulting in weakened performance after additive manufacturing. In addition, the stirring head needs to be able to cooperate with a stable powder feeding mechanism when working to avoid uneven performance between different additive layers.

[0006] In summary, the main shortcomings of currently available technologies are as follows: 1. Existing devices do not adequately stir the material during the additive process, resulting in poor bonding between the additive layer and the parent material. 2. Existing devices lack auxiliary cooling, and the heat from the processed material affects the unadded portion, weakening the performance of the additive layer. 3. Existing devices struggle to maintain a stable powder delivery and are unable to adaptively control the powder flow rate based on process conditions, resulting in low additive efficiency. Summary of the Invention

[0007] The present invention is made to solve the above-mentioned problems, and its purpose is to provide a double-stirring head friction stir additive manufacturing device with auxiliary cooling.

[0008] The present invention provides a double-stirring head friction stir additive manufacturing device with auxiliary cooling, which has the following characteristics: a powder feeding component for conveying powder, comprising a storage box for storing dust, an impeller connected to the storage box through a bellows, a pump body arranged outside the impeller, a flow controller connected to the pump body, and a powder delivery pipe connected to the flow controller; a stirring component for using powder for friction stir additive manufacturing, comprising a main shaft with a hollow interior, a funnel arranged above the main shaft, a sealing cover arranged on the funnel and connected to the powder delivery pipe, a powder feeding shaft passing through the funnel and the sealing cover and arranged inside the main shaft, a shaft shoulder arranged at the bottom of the main shaft, and a stirring head for friction stir additive manufacturing arranged at the bottom of the shaft shoulder; an auxiliary cooling component for cooling the added material area, comprising A water pump storing coolant, a radiator, a roller with a cavity inside for cooling, a first coolant pipe connecting the outlet of the water pump and the roller, a second coolant pipe connecting the roller and the radiator, and a third coolant pipe connecting the radiator and the inlet of the water pump; an installation connection component, including a first box body for installing the stirring component and the pump body, a second box body for installing the auxiliary cooling component, and a connecting plate for installing the first box body and the second box body and connecting to the outside, wherein the first box body and the second box body are arranged adjacent to each other, and when adding material, the roller moves with the stirring head, and after the stirring head stirs and frictions the added material, the roller rolls and crushes the added material area to cool it down, and the stirring head includes three main stirring heads and one auxiliary stirring head, and a powder outlet is provided between two adjacent main stirring heads.

[0009] The double-stirring head friction stir additive manufacturing device with auxiliary cooling provided by the present invention may also have the following features: the impeller is connected to a first motor for driving, a shaft sleeve is also provided on the pump body, and the rotating shaft of the first motor passes through the shaft sleeve and is connected to the impeller.

[0010] In the double-stirring head stir friction additive manufacturing device with auxiliary cooling provided by the present invention, it can also have the following features: wherein, the main shaft is also provided with a main shaft synchronous pulley, the main shaft synchronous pulley is connected to the motor synchronous pulley through a synchronous belt, the motor synchronous pulley is connected to the second motor, and the second motor drives the motor synchronous pulley to rotate to drive the main shaft to rotate.

[0011] The double-stirring head friction stir additive manufacturing device with auxiliary cooling provided by the present invention may also have the following features: a spiral blade is provided on the powder feeding shaft, the top end of the powder feeding shaft is connected to a third motor through a coupling, and a motor mounting seat is also provided in the first box body for installing the third motor.

[0012] The double-stirring head friction stir additive manufacturing device with auxiliary cooling provided by the present invention may also have the following features: a mounting seat is further provided in the first box body for mounting the funnel, and a thrust ball bearing is further provided in the mounting seat, and the thrust ball bearing is in contact with the top end of the main shaft.

[0013] In the double-stirring head friction stir additive manufacturing device with auxiliary cooling provided by the present invention, it can also have the following features: wherein, the lower part of the main shaft is also provided with an angular contact ball bearing, the angular contact ball bearing is installed at the bottom of the first box body, and the lower part of the main shaft and the shoulder pass through the angular contact ball bearing and are placed on the outside of the bottom of the first box body.

[0014] In the double-stirring head stir friction additive manufacturing device with auxiliary cooling provided by the present invention, it can also have the following features: the main stirring head is threaded and has an inclination, the auxiliary stirring head is a cylindrical stirring head arranged on the periphery of the bottom of the shoulder, the powder outlet is stepped, and a guide slope is provided inside the powder outlet.

[0015] The double-stirring head friction stir additive manufacturing device with auxiliary cooling provided by the present invention may also have the following features: a micro vacuum pump for generating negative pressure is also installed on the sealing cover, and a powder inlet is also provided on the sealing cover, which is connected to the powder conveying pipe.

[0016] In the double-stirring head friction stir additive manufacturing device with auxiliary cooling provided by the present invention, it can also have the following features: wherein, a water pump connecting shaft and a radiator connecting shaft are respectively provided on both sides of the roller, the water pump connecting shaft is connected to the first coolant pipe, and the radiator connecting shaft is connected to the second coolant pipe, and cylindrical roller bearings are both provided on the water pump connecting shaft and the radiator connecting shaft. Two mounting plates are provided at the bottom of the second box body, and the cylindrical roller bearings are correspondingly installed in the mounting plates. The roller is installed at the bottom of the second box body through the cylindrical roller bearings and the mounting plates.

[0017] The double-stirring head friction stir additive manufacturing device with auxiliary cooling provided by the present invention may also have the following feature: the contact points between the roller and the water pump connecting shaft and the radiator connecting shaft are all provided with a circumferential array of holes for the flow of coolant in and out.

[0018] Functions and effects of the invention

[0019] According to the double-stirring head friction stir additive manufacturing device with auxiliary cooling involved in the present invention, the powder can obtain energy by driving the impeller to rotate to generate centrifugal force, thereby transporting the powder to the main shaft, and the continuous rotation of the impeller will continuously form a vacuum at the inlet, so that stable powder transportation can be guaranteed. At the same time, a flow controller is installed at the outlet of the pump body to adjust the flow rate of the powder. Combined with the rotation speed of the powder feeding shaft driven by the second motor, the powder output speed of the powder outlet can be guaranteed to match the moving speed of the stirring head. In addition, the dust in the storage box of the present invention is transported to the main shaft through the powder conveying pipe through the sealing cover, and the sealing cover is provided with a micro vacuum pump to generate negative pressure. Pressure can ensure that the powder conveying process is in a closed environment, effectively preventing powder from splashing and damaging the environment; in addition, the present invention has three main stirring heads and one auxiliary stirring head. The three main stirring heads with threads and inclinations can better combine the additive material with the parent material. At the same time, the auxiliary stirring heads can perform secondary stirring during the additive process, which can make the stirring more sufficient and make the material performance after additive more excellent; at the same time, the present invention is also provided with an auxiliary cooling component to assist in cooling the surface of the additive material, which can inhibit the reheating and softening effect of the subsequent additive thermal process on the additive layer, effectively avoid the weakening of the performance of the additive layer and release the stress, so that the performance of different additive layers is more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 1 is a schematic diagram of the overall structure of a double-stirring head friction stir additive manufacturing device with auxiliary cooling in an embodiment of the present invention;

[0021] Figure 2 is a front view of a dual-stirring head friction stir additive manufacturing device with auxiliary cooling in an embodiment of the present invention;

[0022] Figure 3 2 is a schematic structural diagram of a powder feeding assembly in an embodiment of the present invention;

[0023] Figure 4 is a schematic cross-sectional view of a stirring assembly in an embodiment of the present invention;

[0024] Figure 5 is a schematic structural diagram of a sealing cover in an embodiment of the present invention;

[0025] Figure 6 2 is a schematic structural diagram of the bottom portion of the shaft shoulder in an embodiment of the present invention;

[0026] Figure 7 is a cross-sectional schematic diagram of a powder feeding assembly, a stirring assembly, and a first housing in an embodiment of the present invention;

[0027] Figure 8 2 is a schematic diagram of the overall structure of the auxiliary cooling assembly and the second box in an embodiment of the present invention;

[0028] Figure 9 is a schematic cross-sectional view of a roller connection structure in an embodiment of the present invention; DETAILED DESCRIPTION

[0029] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the following embodiments and the accompanying drawings specifically illustrate the dual-stirring head stir friction additive manufacturing device with auxiliary cooling of the present invention.

[0030] Figure 1 1 is a schematic diagram of the overall structure of a double-stirring head friction stir additive manufacturing device with auxiliary cooling in an embodiment of the present invention; Figure 2 4 is a front view of a double-stirring head friction stir additive manufacturing device with auxiliary cooling in an embodiment of the present invention.

[0031] like Figure 1 and Figure 2 As shown, a double-stirring head stir friction additive manufacturing device 100 with auxiliary cooling in this embodiment includes a powder feeding component 10, a stirring component 20, an auxiliary cooling component 30 and an installation and connection component, and the installation and connection component includes a first box body 41, a second box body 42 and a connecting plate 43.

[0032] Figure 3 Schematic diagram of the structure of the powder feeding assembly in an embodiment of the present invention.

[0033] like Figure 3 As shown, the powder feeding assembly 10 is used to convey powder, including a storage box 11 for storing dust, an impeller 13 connected to the storage box 11 through a bellows 12, a pump body 14 arranged on the outside of the impeller 13, a flow controller 15 connected to the pump body 14, and a powder conveying pipe 16 connected to the flow controller 15.

[0034] The impeller 13 is connected to a first motor 17 for driving. A shaft sleeve 18 is further provided on the pump body 14 . The rotating shaft of the first motor 17 passes through the shaft sleeve 18 and is connected to the impeller 13 .

[0035] Figure 4 2 is a cross-sectional schematic diagram of a stirring assembly in an embodiment of the present invention.

[0036] like Figure 4 As shown, the stirring assembly 20 is used to stir friction additive manufacturing using powder, and includes a main shaft 21 with a hollow interior, a funnel 22 arranged above the main shaft 21, a sealing cover 23 arranged on the funnel 22 and connected to the powder conveying pipe 16, a powder feeding shaft 24 passing through the funnel 22 and the sealing cover 23 and arranged inside the main shaft 21, a shoulder 25 arranged at the bottom of the main shaft 21, and a stirring head 26 arranged at the bottom of the shoulder 25 for stir friction additive manufacturing.

[0037] In this embodiment, the main shaft 21 and the shaft shoulder 25 are connected by bolts.

[0038] Figure 5 2 is a schematic structural diagram of a sealing cover in an embodiment of the present invention.

[0039] like Figure 5 As shown, a micro vacuum pump 231 for generating negative pressure is also installed on the sealing cover 23 , and a powder inlet 232 is also provided on the sealing cover 23 , and the powder inlet 232 is connected to the powder conveying pipe 16 .

[0040] A mounting seat 411 is further provided in the first box body 41 for mounting the funnel 22 , and a thrust ball bearing 27 is further provided in the mounting seat 411 . The thrust ball bearing 27 is in contact with the top end of the main shaft 21 .

[0041] The lower part of the main shaft 21 is also sleeved with an angular contact ball bearing 28, which is installed at the bottom of the first box body 41. The lower part of the main shaft 21 and the shaft shoulder 25 pass through the angular contact ball bearing 28 and are placed outside the bottom of the first box body 41.

[0042] In this embodiment, the top end of the main shaft 21 cooperates with the thrust ball bearing 27, which can withstand axial pressure when rolling the additive powder.

[0043] The main shaft 21 is also provided with a main shaft synchronous pulley 211, which is connected to a motor synchronous pulley 213 through a synchronous belt 212. The motor synchronous pulley 213 is connected to a second motor 214. The second motor 214 drives the motor synchronous pulley 213 to rotate, thereby driving the main shaft 21 to rotate.

[0044] The powder feeding shaft 24 is provided with a spiral blade, and the top end of the powder feeding shaft 24 is connected to the third motor 242 via a coupling 241 . The first box body 41 is further provided with a motor mounting seat 412 for mounting the third motor 242 .

[0045] Figure 6 2 is a schematic structural diagram of the bottom of the shaft shoulder in an embodiment of the present invention.

[0046] like Figure 6 As shown, the stirring head 26 includes three main stirring heads 261 and an auxiliary stirring head 262 , and a powder outlet 263 is provided between two adjacent main stirring heads 261 .

[0047] The main stirring head 261 is threaded and has a slope of 10°, and the auxiliary stirring head 262 is a cylindrical stirring head arranged on the periphery of the bottom of the shaft shoulder 25.

[0048] The powder outlet 263 is stepped, and a guide slope 264 is provided inside the powder outlet 263 .

[0049] In this embodiment, the hollow interior of the spindle 21 serves as a powder delivery channel. A third motor 242 drives the powder delivery shaft 24 to rotate via a coupling 241. After the powder enters the spindle 21, the spiral blades of the powder delivery shaft 24 drive the additive powder along the inner wall of the spindle 21 to the powder outlet 263 on the shoulder 25. Furthermore, the rotational speed of the powder delivery shaft 24 can be controlled to match the movement speed of the agitator head 26, outputting a reasonable amount of additive powder.

[0050] In this embodiment, the length of the main stirring head 261 is 3 mm, the length of the auxiliary stirring head 262 is 2 mm, and the diameter of the shaft shoulder 25 is 30 mm.

[0051] Figure 7 It is a cross-sectional schematic diagram of the powder feeding assembly, the stirring assembly and the first box body in an embodiment of the present invention.

[0052] like Figure 7 As shown, in this embodiment, the powder feeding assembly 10 and the stirring assembly 20 are specifically installed and arranged in the first box body 41 as follows:

[0053] The first box body 41 is used to install the stirring assembly 20 and the pump body 14. The first box body 41 includes a large box body and a small box body arranged at the bottom of the large box body. The large box body is fixed to the connecting plate 43 by bolts.

[0054] The pump body 14 is fixed to one side of the large box by bolts, the impeller 13 is arranged in the side of the large box, and the first motor 17, the shaft sleeve 18, the flow controller 15, and the powder conveying pipe 16 are all located in the large box. The impeller 13 is connected to the storage box 11 located outside the box through the bellows 12.

[0055] The mounting seat 411 and the motor mounting seat 412 are both arranged in the large box, and the mounting seat 411 is arranged at the bottom of the large box. The angular contact ball bearing 28 is installed in the bottom of the small box. The top end of the main shaft 21 is in contact with the thrust ball bearing 27 and the funnel 22. The lower end of the main shaft 21 and the shoulder 25 pass through the angular contact ball bearing 28, so that the shoulder 25 is located on the outside of the bottom of the small box.

[0056] The main shaft synchronous pulley 211, the synchronous belt 212 and the motor synchronous pulley 213 are all arranged in the small box, the second motor 214 is installed at the bottom of the large box and the output shaft of the second motor 214 passes through the bottom of the large box and is connected to the motor synchronous pulley 213.

[0057] Figure 8 Schematic diagram of the overall structure of the auxiliary cooling assembly and the second box in an embodiment of the present invention. Figure 9 2 is a schematic cross-sectional view of a roller connection structure in an embodiment of the present invention.

[0058] like Figure 8 and Figure 9As shown, the second box 42 is used to install the auxiliary cooling assembly 30, which is used to cool the added material area, including a water pump 31 storing coolant, a radiator 32, a roller 33 with a cavity inside for cooling, a first coolant pipe 34 connecting the outlet of the water pump 31 and the roller 33, a second coolant pipe 35 connecting the roller 33 and the radiator 32, and a third coolant pipe 36 connecting the radiator 32 and the inlet of the water pump 31.

[0059] A water pump connecting shaft 331 and a radiator connecting shaft 332 are respectively provided on both sides of the roller 33. The water pump connecting shaft 331 is connected to the first coolant pipe 34, and the radiator connecting shaft 332 is connected to the second coolant pipe 35.

[0060] Cylindrical roller bearings 333 are both mounted on the water pump connecting shaft 331 and the radiator connecting shaft 332. Two mounting plates 421 are provided at the bottom of the second box body 42. The cylindrical roller bearings 333 are correspondingly mounted in the mounting plates 421. The roller 33 is mounted at the bottom of the second box body through the cylindrical roller bearings 333 and the mounting plates 421.

[0061] The contact points between the roller 33 and the water pump connecting shaft 331 and the radiator connecting shaft 332 are all provided with a circumferential array of holes 334 for the flow of coolant in and out.

[0062] In this embodiment, a cavity 335 is provided in the roller 33. When the roller 33 rolls over the area where the material has been added, the roller 33 is cooled by heat exchange with the coolant in the cavity 335. The coolant circulates between the water pump 31, the radiator 32, and the cavity 335 of the roller 33 in the following manner:

[0063] The coolant in the water pump 31 is transported to the water pump connecting shaft 331 through the first coolant pipe 34. A circumferential array of holes 334 is provided at the contact point between the roller 33 and the water pump connecting shaft 331, allowing the coolant to enter the cavity 335 inside the roller 33. After heat exchange, the coolant flows out from the circumferential array of holes 334 on the other side of the roller 33, passes through the radiator connecting shaft 332 and the second coolant pipe 35 to the radiator 32. After the operation of the radiator 32, the temperature of the high-temperature coolant drops, and then passes through the third coolant pipe 36 to the pump body 31 to circulate the coolant.

[0064] The first box body 41 and the second box body 42 are installed on the connecting plate 43 by bolts, and the first box body 41 and the second box body 42 are arranged adjacent to each other. When adding material, the roller 33 moves with the stirring head 26. After the stirring head 26 stirs and frictionally adds material, the roller 33 rolls and crushes the added material area to cool it down.

[0065] The connecting plate 43 is also used for connecting to the outside. When using the double-stirring head friction stir additive manufacturing device 100 with auxiliary cooling of this embodiment, it can be connected to the spindle of a milling machine or a machining center by installing a ball screw behind the connecting plate 43, and the storage box 11 can be fixed on the machine tool. The entire device has good compatibility and can reduce manufacturing costs.

[0066] In this embodiment, the specific working process of a dual-stirring head friction stir additive manufacturing device 100 with auxiliary cooling is as follows:

[0067] Before adding material, the additive powder is first poured into the storage box 11. During operation, the first motor 17 drives the impeller 13 to rotate, sucking in the powder in the storage box 11 and generating centrifugal force to allow the powder to gain energy. The powder is discharged from the pump body 14, and the flow rate is adjusted by the flow controller 15 to make the powder flow rate adapt to the requirements of the additive. The powder enters the sealing cover 23 through the powder conveying pipe 16 and the powder inlet 232 and is conveyed to the funnel 22. In the powder feeding process, the micro vacuum pump 232 works to generate negative pressure in the sealing cover 23, and the sealing cover 23 is adsorbed on the funnel 22 to ensure the airtightness of the powder delivery environment.

[0068] The powder enters the main shaft 21 through the funnel 22, and the third motor 242 drives the powder feeding shaft 24 to rotate through the coupling 241. The spiral blades on the powder feeding shaft 24 drive the powder to be transported downward to the powder outlet 263 of the shoulder 25. The second motor 214 drives the motor synchronous pulley 213 to rotate, and drives the main shaft 21 to rotate through the synchronous belt 212 and the main shaft synchronous pulley 211, so that the stirring head 26 under the shoulder 25 rotates. After the stirring head 26 starts to rotate, the entire device is lowered along the Z-axis direction until the stirring head 26 enters the parent material by 1 to 2 mm. The additive powder flows out from the powder outlet 263 and flows out to the stir friction additive area through the guide slope 264. A large amount of heat is generated under the downward pressure and friction of the shoulder 25 and the stirring friction of the main stirring head 261, which plasticizes and combines the additive powder and part of the base material, and the auxiliary stirring head 262 performs secondary stirring to make the stirring more sufficient to form an additive layer.

[0069] During operation, the roller 33 moves along with the stirring head 26. After the material addition is completed, the roller 33 rolls and crushes the added material area, and cools the added material area through heat exchange with the coolant in the cavity 335. The coolant circulates between the water pump 31, the radiator 32, and the roller 33 to ensure that the roller 33 can maintain a relatively low temperature for cooling.

[0070] In addition, after completing one layer of material addition, the present embodiment can lift the entire device to continue adding material, thereby improving the efficiency of material addition.

[0071] Functions and Effects of the Embodiments

[0072] According to the double-stirring head friction stir additive manufacturing device with auxiliary cooling involved in this embodiment, because the centrifugal force generated by driving the impeller to rotate during powder transportation can enable the powder to obtain energy, thereby transporting the powder to the main shaft, and the continuous rotation of the impeller will continuously form a vacuum at the inlet, so that stable powder transportation can be guaranteed. At the same time, a flow controller is installed at the outlet of the pump body to adjust the flow rate of the powder. Combined with the rotation speed of the powder feeding shaft driven by the second motor, it can be ensured that the speed of the powder output from the powder outlet matches the moving speed of the stirring head. In addition, the dust in the storage box of this embodiment is transported to the main shaft through the powder delivery pipe through the sealing cover, and the sealing cover is provided with a micro vacuum pump to generate negative pressure. Pressure can ensure that the powder conveying process is in a closed environment, effectively preventing powder from splashing and damaging the environment; in addition, this embodiment has three main stirring heads and one auxiliary stirring head. The three main stirring heads with threads and inclinations can better combine the additive material with the parent material. At the same time, the auxiliary stirring heads can perform secondary stirring during the additive process, which can make the stirring more sufficient and make the material performance after additive more excellent; at the same time, this embodiment is also provided with an auxiliary cooling component to assist in cooling the surface of the additive material, which can inhibit the reheating and softening effect of the subsequent additive thermal process on the additive layer, effectively avoid the weakening of the performance of the additive layer and release the stress, so that the performance of different additive layers is more uniform.

[0073] Furthermore, a thrust ball bearing is provided at the top end of the main shaft, which can withstand axial pressure when the additive powder is rolled.

[0074] The above embodiments are preferred examples of the present invention and are not intended to limit the scope of protection of the present invention.

Claims

1. A double-stirring head friction stir additive manufacturing device with auxiliary cooling, characterized in that: include: A powder delivery assembly for delivering powder, comprising a storage box for storing the powder, an impeller connected to the storage box via a bellows, a pump body disposed outside the impeller, a flow controller connected to the pump body, and a powder delivery pipe connected to the flow controller; a stirring assembly for performing friction stir additive manufacturing using the powder, comprising a main shaft with a hollow interior, a funnel disposed above the main shaft, a sealing cover disposed on the funnel and connected to the powder delivery pipe, a powder feeding shaft passing through the funnel and the sealing cover and disposed inside the main shaft, a shoulder disposed at the bottom of the main shaft, and a stirring head disposed at the bottom of the shoulder for performing friction stir additive manufacturing; An auxiliary cooling assembly, for cooling the area where the material has been added, comprising a water pump storing coolant, a radiator, a roller having a cavity therein for cooling, a first coolant pipe connecting the outlet of the water pump and the roller, a second coolant pipe connecting the roller and the radiator, and a third coolant pipe connecting the radiator and the inlet of the water pump; The installation connection assembly includes a first box for installing the stirring assembly and the pump body, a second box for installing the auxiliary cooling assembly, and a connecting plate for installing the first box and the second box and connecting to the outside. The first box and the second box are arranged adjacent to each other. When adding materials, the roller moves along with the stirring head. After the stirring head stirs and friction adds materials, the roller rolls and crushes the added material area to cool it down. The stirring head includes three main stirring heads and one auxiliary stirring head, and a powder outlet is provided between two adjacent main stirring heads.

2. The dual-stirring head friction stir additive manufacturing device with auxiliary cooling according to claim 1, characterized in that: in, The impeller is connected to a first motor for driving. A shaft sleeve is further provided on the pump body. The rotating shaft of the first motor passes through the shaft sleeve and is connected to the impeller.

3. The dual-stirring head friction stir additive manufacturing device with auxiliary cooling according to claim 1, characterized in that: in, The main shaft is also provided with a main shaft synchronous pulley, which is connected to a motor synchronous pulley via a synchronous belt. The motor synchronous pulley is connected to a second motor, and the second motor drives the motor synchronous pulley to rotate to drive the main shaft to rotate.

4. The dual-stirring head friction stir additive manufacturing device with auxiliary cooling according to claim 1, characterized in that: in, The powder feeding shaft is provided with a spiral blade, the top end of the powder feeding shaft is connected to a third motor via a coupling, and the first box body is further provided with a motor mounting seat for mounting the third motor.

5. The dual-stirring head friction stir additive manufacturing device with auxiliary cooling according to claim 1, characterized in that: in, The first box body is further provided with a mounting seat for mounting the funnel, and the mounting seat is further provided with a thrust ball bearing, and the thrust ball bearing is in contact with the top end of the main shaft.

6. The dual-stirring head friction stir additive manufacturing device with auxiliary cooling according to claim 1, characterized in that: in, The lower part of the main shaft is also sleeved with an angular contact ball bearing, which is installed at the bottom of the first housing. The lower part of the main shaft and the shaft shoulder pass through the angular contact ball bearing and are placed outside the bottom of the first housing.

7. The dual-stirring head friction stir additive manufacturing device with auxiliary cooling according to claim 1, characterized in that: in, The main stirring head is threaded and has an inclination, and the auxiliary stirring head is a cylindrical stirring head arranged on the periphery of the bottom of the shoulder. The powder outlet is stepped, and a guide slope is provided inside the powder outlet.

8. The dual-stirring head friction stir additive manufacturing device with auxiliary cooling according to claim 1, characterized in that: in, The sealing cover is also provided with a micro vacuum pump for generating negative pressure. The sealing cover is also provided with a powder inlet, which is connected to the powder conveying pipe.

9. The dual-stirring head friction stir additive manufacturing device with auxiliary cooling according to claim 1, characterized in that: in, A water pump connecting shaft and a radiator connecting shaft are respectively provided on both sides of the roller. The water pump connecting shaft is connected to the first coolant pipe, and the radiator connecting shaft is connected to the second coolant pipe. The water pump connecting shaft and the radiator connecting shaft are both sleeved with cylindrical roller bearings. Two mounting plates are provided at the bottom of the second box body. The cylindrical roller bearings are correspondingly installed in the mounting plates. The roller is installed at the bottom of the second box body through the cylindrical roller bearings and the mounting plates.

10. The dual-stirring head friction stir additive manufacturing device with auxiliary cooling according to claim 9, characterized in that: in, The contact points between the roller and the water pump connecting shaft and the radiator connecting shaft are all provided with circumferential array holes for the coolant to flow in and out.

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