Frictional heat additive manufacturing device and method

Abstract

The present invention relates to the technical field of friction stir welding, and specifically to a friction heat additive manufacturing device and method, comprising: a bracket, on which a stirring head is rotatably mounted; an auxiliary material discharge structure, arranged in the stirring head, and capable of driving the plasticized material inside the stirring head to move toward the lower end of the stirring head; a clamping assembly, which is provided with two groups and is installed on the bracket, the two groups of the clamping assemblies are used to clamp a rod and make the rod coaxial with the stirring head, and one group of the clamping assemblies can control the rotation speed of the stirring head through an adjusting structure arranged on the bracket; and a retracting structure, which connects the two groups of the clamping assemblies, and the retracting structure can increase the clamping force of the two groups of the clamping assemblies on the rod when the two groups of the clamping assemblies move away from each other, and increase the rotation speed of the stirring head, thereby ensuring the continuity of material feeding and preventing the plasticized material from solidifying.

Description

Technical Field

[0001] The present invention relates to the technical field of friction stir welding, and in particular to a friction heat additive manufacturing device and method. Background Art

[0002] With the development of manufacturing technology, there is a gradual shift from traditional manufacturing methods to advanced manufacturing. Additive manufacturing, with its rapid and efficient features, has become a typical example of advanced manufacturing technology. Additive technology has been widely researched and applied in manufacturing industries such as aerospace, rail transportation, and shipping.

[0003] Additive technology mainly uses the rotation of the stirring head to plasticize and fuse the materials inside and outside the stirring head separately to improve material properties. Among them, the materials inside the stirring head are mostly rods, which are plasticized by generating heat through friction with the friction part inside the stirring head, and are evenly mixed with the material outside the stirring head when the stirring head moves linearly.

[0004] In actual production, even for the same rod, there may be slight density deviations in different areas. When the area with higher density rubs against the stirring head, the plasticizing speed of the rod will decrease, and the amount of plasticization of the rod will be reduced, resulting in unstable discharge of the plasticized material. In severe cases, the plasticized material at the end of the stirring head will solidify. Summary of the Invention

[0005] The object of the present invention is to provide a friction heat additive manufacturing device and method to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: A friction heat additive manufacturing device, comprising: A bracket, on which a stirring head is rotatably mounted; An auxiliary material discharge structure is provided in the stirring head, and the auxiliary material discharge structure can drive the plasticized material inside the stirring head to move toward the lower end of the stirring head; Two clamping assemblies are provided and mounted on the bracket, the two clamping assemblies are used to clamp the rod and make the rod coaxial with the stirring head, and one of the clamping assemblies can control the rotation speed of the stirring head through an adjustment structure provided on the bracket; A folding structure connects the two groups of clamping assemblies. The folding structure can increase the clamping force of the two groups of clamping assemblies on the rod and increase the rotation speed of the stirring head when the two groups of clamping assemblies move away from each other.

[0007] As a further solution of the present invention: a first inner conical surface is provided in the stirring head, and the friction between the first inner conical surface and the rod can plasticize the rod; The auxiliary material discharge structure includes a second inner conical surface provided in the mixing head and extending to the lower end portion of the mixing head, and a plurality of groups of inclined baffles are provided in a circumferentially equidistant manner in the second inner conical surface.

[0008] As a further solution of the present invention: the lower end portion of the stirring head is also provided with a plurality of groups of bosses and a plurality of groups of arc grooves spreading outward from the center at equal intervals on the circumference.

[0009] As a further solution of the present invention: the two groups of clamping assemblies are arranged along the vertical direction of the space, and the clamping assembly located at the upper part is provided with a second sliding connection portion, and the second sliding connection portion is slidably connected to a second vertical groove provided on the bracket; The adjustment structure includes a gear switch and a first motor fixedly mounted on the bracket, wherein the first motor is electrically connected to the gear switch; The gear switch is connected to the second sliding connection part through a pull wire, and the first motor is connected to the stirring head through a first belt.

[0010] As a further solution of the present invention, the clamping assembly includes a connecting frame arranged on the bracket, the connecting frame is symmetrically provided with two groups of first sliding grooves, two groups of first sliders are slidably installed in the first sliding grooves, and a driving sheave is rotatably installed on the first slider; The clamping assembly further includes an elastic structure for driving the two groups of the first sliding blocks to move toward each other and a hinge structure connected to the two groups of the first sliding blocks.

[0011] As a further solution of the present invention: the elastic structure includes a horizontal axis fixedly installed in the first sliding groove and slidingly connected to the first slider, and the horizontal axis is also sleeved with a cylindrical spring, one end of the cylindrical spring is connected to the first slider, and the other end is connected to the retracting structure.

[0012] As a further solution of the present invention: the hinged structure includes a second slide groove opened on the connecting frame and perpendicular to the first slide groove, a third slider is slidably installed in the second slide groove, a pulling rod is symmetrically rotatably installed on the third slider, and the end of the pulling rod away from the third slider is rotatably connected to the first slider.

[0013] As a further embodiment of the present invention, the retracting structure includes a second slider disposed in the first sliding groove and slidably connected to the transverse axis, the second slider being connected to an end of the cylindrical spring away from the first slider, and a convex shaft being rotatably mounted on the second slider; The folding structure further includes a connecting plate provided on the bracket, wherein one end of the connecting plate is formed with a first sliding connection portion, and the first sliding connection portion is slidably connected to a first vertical groove provided on the bracket; The first sliding connection portion is further symmetrically provided with inclined grooves, and the protruding shaft can roll in the inclined grooves.

[0014] A friction heat additive manufacturing method, using the friction heat additive manufacturing device, comprises the following steps: Step 1: Fix the substrate on the clamping fixture; Step 2: Pass the rod through the two sets of clamping assemblies and make the lower end of the rod abut against the inside of the stirring head; Step 3: Control the clamping assembly and the adjustment structure to drive the rod toward the stirring head while rotating the stirring head to plasticize the rod through frictional heat generation; Step 4: Control the stirring head to move along the length of the substrate for continuous addition Compared with the prior art, the present invention has the following beneficial effects: By providing a stirring head and an auxiliary material discharge structure, after the end of the rod is plasticized, it can enter the conical cavity formed by the second inner conical surface under the extrusion of the rod, and under the action of the inclined baffle, on the one hand, the plasticized material can generate a downward force, and on the other hand, the plasticized material can rotate with the stirring head, generating centrifugal force while generating another downward force under the action of the second inner conical surface. The superposition of the two downward forces can accelerate the plasticized material to move toward the substrate when entering the second inner conical surface, thereby preventing the plasticized material from cooling down due to the slow moving speed when entering the second inner conical surface, resulting in solidification or curing, and improving the fluidity of the plasticized material in the stirring head; By setting up an adjustment structure, the rotation speed of the stirring head can be adjusted in real time according to the plasticizing speed of the rod, so that the plasticizing speed of the rod is consistent. This can make the discharge of the plasticized material more uniform and improve the additive effect. On the other hand, it can avoid the situation where the plasticized material is interrupted from moving toward the second inner conical surface, resulting in the inability to transfer heat and causing the solidification of the partially plasticized material in the second inner conical surface. Through the provided clamping assembly, on the one hand, it is possible to clamp rods whose diameters are within a predetermined error range and improve the coaxiality between the rods and the stirring head; on the other hand, it is possible to ensure the friction between the rods and the driving groove wheel, so that the rods can be transported stably without rotating with the stirring head, thereby improving the stability of the rods during transportation, ensuring the stability of the feeding, and ensuring that the overall additive effect is more consistent. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1This is a structural schematic diagram of an embodiment of a friction heat additive manufacturing device and method.

[0016] Figure 2 This is a structural schematic diagram from another angle of an embodiment of a friction heat additive manufacturing device and method.

[0017] Figure 3 for Figure 2 A magnified view of the structure at point A in the middle.

[0018] Figure 4 for Figure 2 A magnified view of the structure at point B.

[0019] Figure 5 This is a cross-sectional view of a stirring head in one embodiment of a friction heat additive manufacturing device and method.

[0020] Figure 6 This is a schematic structural diagram of a clamping assembly in one embodiment of a friction heat additive manufacturing device and method.

[0021] Figure 7 This is an exploded view of the structure of the clamping assembly in one embodiment of the friction heat additive manufacturing device and method.

[0022] Figure 8 This is a structural schematic diagram of the folding structure in one embodiment of the friction heat additive manufacturing device and method.

[0023] In the figure: 1. bracket; 101. first vertical groove; 102. second vertical groove; 2. stirring head; 201. first inner cone; 202. second inner cone; 203. arc groove; 3. inclined baffle; 4. boss; 5. first belt; 6. first motor; 7. rod; 8. connecting frame; 801. first slide; 802. second slide; 9. horizontal axis; 10. cylindrical spring; 11. first slider; 12. second slider; 13. convex axis; 14. pulling rod; 15. third slider; 16. driving sheave; 17. second motor; 18. second belt; 19. connecting plate; 1901. inclined groove; 20. first sliding connection; 21. second sliding connection; 22. pull wire; 23. gear switch. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] In addition, when an element in the present invention is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0026] See also Figures 1 to 8 In an embodiment of the present invention, a friction heat additive manufacturing device includes: a bracket 1, an auxiliary material discharge structure, a clamping assembly, and a retracting structure, so that after the end of the rod 7 is plasticized, it can enter the conical cavity formed by the second inner conical surface 202 under the extrusion of the rod 7, and under the action of the inclined baffle 3, on the one hand, the plasticized material can generate a downward force, and on the other hand, the plasticized material can rotate with the stirring head 2, generating centrifugal force while generating another downward force under the action of the second inner conical surface 202. The superposition of the two downward forces can accelerate the plasticized material to move toward the substrate when entering the second inner conical surface 202, thereby preventing the plasticized material from cooling down due to the slow moving speed when entering the second inner conical surface 202, resulting in solidification or curing, and improving the fluidity of the plasticized material in the stirring head 2, as follows: It is first explained that the bracket 1 is connected to the transverse drive device (not shown in the figure), and the transverse drive device is installed on the frame structure (not shown in the figure). The clamping tooling (not shown in the figure) provided on the frame structure can clamp and position the substrate, so that when in use, the stirring head 2 can act on the substrate while plasticizing the rod 7, so that the plasticized rod 7 can be mixed with the plasticized material on the substrate, thereby achieving an additive effect. At the same time, the transverse drive device can drive the stirring head 2 to move along the length direction of the substrate, thereby realizing the additive operation in the length direction of the substrate.

[0027] A stirring head 2 is rotatably mounted on the bracket 1, and a first inner conical surface 201 is provided in the stirring head 2. The first inner conical surface 201 rubs against the rod 7 to plasticize the rod 7, and the lower end of the stirring head 2 is also circumferentially equidistantly provided with multiple groups of bosses 4 and multiple groups of arc grooves 203 that spread outward from the center, wherein the first inner conical surface 201 forms a conical cavity with an opening diameter that gradually decreases from top to bottom, and granular protrusions are provided on the first inner conical surface 201, which enables the rod 7 to rub against the first inner conical surface 201 when the rod 7 abuts against the first inner conical surface 201 and the first inner conical surface 201 rotates, thereby generating heat, so that the end of the rod 7 is plasticized and can move toward the opening at the lower end of the stirring head 2.

[0028] The setting of the boss 4 can generate friction with the substrate during rotation, thereby melting the additive area of ​​the substrate. At the same time, a gap is left between two adjacent groups of bosses 4, so that the plasticized material of the rod 7 can diffuse toward the outside from the gap under the action of centrifugal force. Under the stirring and mixing of the boss 4, the plasticized material of the rod 7 is fully mixed with the plasticized material of the substrate, thereby improving the additive effect.

[0029] Furthermore, by setting the arc groove 203, when the stirring head 2 rotates, the plasticized material of the substrate can move toward the central area of ​​the stirring head 2, thereby improving the fluidity of the plasticized material of the substrate and further improving the mixing effect between the plasticized material of the rod 7 and the plasticized material of the substrate.

[0030] The auxiliary material discharge structure is arranged in the mixing head 2, and the auxiliary material discharge structure can drive the plasticized material inside the mixing head 2 to move toward the lower end of the mixing head 2. The auxiliary material discharge structure includes a second inner conical surface 202 arranged in the mixing head 2 and extending to the lower end of the mixing head 2. A plurality of groups of inclined baffles 3 are equidistantly arranged in a circle in the second inner conical surface 202.

[0031] During the additive operation, the clamping assembly can cause the rod 7 to have a tendency to move toward the first inner conical surface 201. At this time, when the rod 7 is heated and plasticized, the rod 7 can move toward the first inner conical surface 201, thereby squeezing out the plasticized material within the first inner conical surface 201, thereby improving the fluidity of the plasticized material of the rod 7.

[0032] Furthermore, the above-mentioned second inner conical surface 202 forms a conical cavity with an opening that gradually increases from top to bottom. At the same time, under the action of the inclined baffle 3, when the plasticized material of the rod 7 is squeezed into the conical cavity, this part of the material can follow the stirring head 2 to perform circular motion under the drive of the inclined baffle 3, and generate centrifugal force. The centrifugal force is in the horizontal direction, so that under the guidance of the second inner conical surface 202, the plasticized material of the rod 7 has a downward moving component, thereby accelerating the flow speed of the plasticized material of the rod 7 in the second inner conical surface 202, and preventing the slow movement speed of the plasticized material from causing it to solidify or semi-solidify in the second inner conical surface 202, resulting in blockage of the lower end of the stirring head 2.

[0033] Furthermore, when the plasticized material of the rod 7 is extruded into the conical cavity, the material in this state is a fluid, and there is a certain speed difference between the plasticized material and the stirring head 2. When the inclined baffle 3 contacts it, the inclined baffle 3 can exert a downward force on the plasticized material when rotating. The downward force is superimposed on the downward force given by the second inner cone 202, which can further increase the speed of the plasticized material moving toward the substrate, and further prevent the plasticized material of the rod 7 from solidifying or semi-solidifying.

[0034] It is worth noting that the material after plasticization by the rod 7 is also subject to centrifugal force in the conical cavity formed by the first inner conical surface 201 and has a tendency to move upward. However, under the extrusion of the rod 7, the material in this area can only move downward, and this area is close to the friction area between the rod 7 and the first inner conical surface 201, which can prevent the plasticized material from solidifying or semi-solidifying.

[0035] Through the above arrangement, after the end of the rod 7 is plasticized, it can enter the conical cavity formed by the second inner cone 202 under the extrusion of the rod 7, and under the action of the inclined baffle 3, on the one hand, the plasticized material can generate a downward force, and on the other hand, the plasticized material can rotate with the stirring head 2, generating centrifugal force while generating a downward force again under the action of the second inner cone 202. The superposition of the two downward forces can accelerate the plasticized material to move toward the substrate when entering the second inner cone 202, thereby preventing the plasticized material from cooling down due to the slow moving speed when entering the second inner cone 202, resulting in solidification or curing, and improving the fluidity of the plasticized material in the stirring head 2.

[0036] See also Figure 2 , the clamping assembly is provided with two groups and is installed on the bracket 1, the two groups of the clamping assembly are used to clamp the rod 7 and make the rod 7 coaxial with the stirring head 2, and one group of the clamping assembly can control the rotation speed of the stirring head 2 through the adjustment structure provided on the bracket 1; The two groups of clamping assemblies are arranged along the vertical direction of the space, and the upper clamping assembly is provided with a second sliding connection portion 21, which is slidably connected to the second vertical groove 102 provided on the bracket 1, while the lower clamping assembly is fixedly installed on the bracket 1; The adjustment structure includes a gear switch 23 and a first motor 6 fixedly mounted on the bracket 1, and the first motor 6 is electrically connected to the gear switch 23; The gear switch 23 is connected to the second sliding connection part 21 through a pull wire 22, and the first motor 6 is connected to the stirring head 2 through a first belt 5; When in use, the first motor 6 works and drives the stirring head 2 to rotate through the first belt 5. At this time, the rod 7 is in a state of being clamped by the two groups of clamping components. At the same time, the clamping component at the upper part can drive the rod 7 to move downward, so that there is a certain abutment force between the rod 7 and the stirring head 2, and heat can be generated by friction. When the density of the local area of ​​the rod 7 increases, the heat generated by the rotation of the stirring head 2 will cause the plasticization speed of the rod 7 to decrease, and the upper clamping component will pull the rod 7 toward the stirring head 2 at a constant speed. At this time, the upper clamping component will move upward relative to the lower clamping component and drive the second sliding connection part 21 to move upward. At this time, the second clamping component will move upward. The second sliding connection part 21 drives the gear switch 23 to operate through the pull wire 22, and controls the speed of the first motor 6 to increase. At this time, the speed of the stirring head 2 increases accordingly, and the friction between the rod 7 and the stirring head 2 increases to increase the plasticizing speed of the rod 7, that is, the rotation speed of the stirring head 2 can be adjusted in real time following the plasticizing speed of the rod 7, so that the plasticizing speed of the rod 7 is consistent. On the one hand, this can make the discharge of the plasticized material more uniform and improve the additive effect. On the other hand, it can avoid the interruption of the plasticized material moving toward the second inner cone 202, resulting in the inability to transfer heat, causing the partial plasticized material in the second inner cone 202 to solidify.

[0037] See also Figure 6-7 The clamping assembly includes a connecting frame 8 provided on the bracket 1, and two groups of first slide grooves 801 are symmetrically provided on the connecting frame 8. Two groups of first sliders 11 are slidably installed in the first slide grooves 801, and a driving sheave 16 is rotatably installed on the first slider 11. It should be noted that one of the groups of first sliders 11 on the upper clamping assembly is further equipped with a second motor 17, and the second motor 17 is connected to the rotating shaft of one group of the driving sheave 16 through a second belt 18; The clamping assembly also includes an elastic structure for driving the two groups of first sliders 11 to move toward each other and a hinged structure connected to the two groups of first sliders 11. Specifically, the elastic structure includes a horizontal shaft 9 fixedly installed in the first slide groove 801 and slidingly connected to the first slider 11. The horizontal shaft 9 is also sleeved with a cylindrical spring 10. One end of the cylindrical spring 10 is connected to the first slider 11, and the other end is connected to the folding structure.

[0038] It should also be noted that the two sets of drive sheaves 16 on the upper clamping assembly are provided with strip-shaped protrusions along their axial direction. The strip-shaped protrusions abut against the rod 7, which can increase the friction between the two sets of drive sheaves 16 and the rod 7, thereby ensuring that when the second motor 17 is working and one set of the drive sheaves 16 is driven to rotate through the second belt 18, there is sufficient friction between the drive sheaves 16 and the rod 7 to drive the rod 7 to move; The two sets of driving sheaves 16 on the clamping assembly at the bottom are provided with strip-shaped protrusions along their radial direction, which abut against the rod 7, so that the rod 7 can achieve axial self-locking, and ensure that when the rod 7 abuts and rubs against the stirring head 2, the rod 7 will not rotate synchronously with the stirring head 2; In summary, the cooperation of the two sets of clamping components can ensure the friction between the rod 7 and the driving groove wheel 16, so that the rod 7 can be stably conveyed without rotating with the stirring head 2, thereby improving the stability of the rod 7 when being conveyed, ensuring the stability of the feeding, and ensuring that the overall effect of the additive is more consistent.

[0039] During use, the rod 7 can be inserted between two sets of cooperating drive sheaves 16, and the elastic force provided by the cylindrical spring 10 can be used to make the drive sheave 16 fit the rod 7 to ensure the guiding effect of the rod 7. Taking into account the deviation in the diameter size of the rod 7, when the rod 7 with a size within the predetermined deviation value range is inserted between the two sets of drive sheaves 16, the two sets of drive sheaves 16 still have a guiding effect on the rod 7.

[0040] In detail, the circular structure formed by the cooperation of the two sets of drive sheaves 16 should be consistent with the lower limit of the diameter deviation value of the rod 7. This is mainly due to the consideration that when the two sets of drive sheaves 16 can clamp the rod 7 with a smaller diameter, they will be able to clamp the rod 7 with the largest diameter deviation value under motion deviation.

[0041] See also Figure 3 、 Figure 6-7 The hinge structure includes a second slide groove 802 opened on the connecting frame 8 and perpendicular to the first slide groove 801. A third slider 15 is slidably installed in the second slide groove 802. A pulling rod 14 is symmetrically rotatably installed on the third slider 15. The end of the pulling rod 14 away from the third slider 15 is rotatably connected to the first slider 11.

[0042] During use, when the distance between the two sets of driving sheaves 16 changes, the driving sheaves 16 can drive the third slider 15 to move through the pulling rod 14, and when the third slider 15 moves, it will drive the other driving sheave 16 to move through another pulling rod 14, that is, the two sets of driving sheaves 16 can move away from or approach the center of the stirring head 2 synchronously, so that when the rod 7 is placed between the two sets of driving sheaves 16, the two sets of driving sheaves 16 can maintain the coaxial state of the rod 7 and the stirring head 2, and when the rod 7 abuts and rubs against the first inner conical surface 201, the lower end of the rod 7 can be evenly fitted with the first inner conical surface 201, and the lower end of the rod 7 can be evenly plasticized in a circular manner when rubbing against the first inner conical surface 201, preventing the rod 7 from being unevenly plasticized due to eccentric wear, further improving the uniformity of feeding after plasticization of the rod 7, and ensuring the quality of additive manufacturing.

[0043] See also Figure 1~Figure 2 、 Figure 8 The retracting structure connects the two groups of clamping assemblies, and the retracting structure can increase the clamping force of the two groups of clamping assemblies on the rod 7 and increase the rotation speed of the stirring head 2 when the two groups of clamping assemblies move away from each other; The folding structure includes a second slider 12 disposed in the first sliding groove 801 and slidably connected to the transverse shaft 9. The second slider 12 is connected to the end of the cylindrical spring 10 away from the first slider 11, and a protruding shaft 13 is rotatably mounted on the second slider 12. The folding structure further includes a connecting plate 19 provided on the bracket 1 , and a first sliding connection portion 20 is formed at one end of the connecting plate 19 , and the first sliding connection portion 20 is slidably connected to a first vertical slot 101 provided on the bracket 1 ; The first sliding connection portion 20 is further symmetrically provided with an inclined groove 1901 , and the protruding shaft 13 can roll in the inclined groove 1901 .

[0044] When the plasticizing speed of the rod 7 decreases due to uneven density distribution, the two sets of driving sheaves 16 on the upper part used to drive the rod 7 downward will move upward. At this time, the first slider 11 and the connecting frame 8 connected thereto will also move upward. At this time, on the one hand, the speed of the first motor 6 is increased, thereby increasing the plasticizing speed. On the other hand, the connecting frame 8 will drive the second slider 12 to move upward and move the convex shaft 13 along the inclined groove 1901, so that the two sets of second sliders 12 on the connecting frame 8 can move closer to each other, further compressing the cylindrical spring 10 that was originally in a compressed state, thereby increasing the abutment force between the two sets of driving sheaves 16 and improving the clamping force on the rod 7. Furthermore, when the cylindrical spring 10 is further compressed, it has a tendency to cause the protruding shaft 13 to move into the inclined groove 1901, so that the upper connecting frame 8 can be pulled downward, thereby increasing the contact force between the rod 7 and the stirring head 2, and cooperating with the increase in the rotation speed of the stirring head 2, the plasticization speed of the rod 7 is accelerated; Similarly, the two groups of second sliders 12 located on the lower connecting frame 8 will also move relatively close to each other, and the clamping force of the two groups of driving groove wheels 16 matched therewith on the rod 7 will increase. In this state, the upper connecting frame 8 will move upward, thereby increasing the length of the rod 7 between the two groups of connecting frames 8 and increasing the downward pressure on the rod 7. By increasing the clamping force between the driving groove wheels 16, the degree to which the rod 7 is bent due to the action of the two upper groups of driving groove wheels 16 on the rod 7 can be suppressed, thereby further improving the coaxiality of the rod 7 and the stirring head 2.

[0045] Through the above-mentioned arrangement, when the plasticization speed of the rod 7 decreases due to uneven density, the two upper groups of driving groove wheels 16 can move upward and play a certain buffering role, and when the two groups of connecting frames 8 move away from each other, the clamping force of the driving groove wheels 16 acting on the rod 7 will increase, thereby improving the straightening and guiding effect of the rod 7, avoiding the bending of the rod 7 caused by the increase in the length of the rod 7 between the two groups of connecting frames 8 and the increase in the downward pressure of the two upper groups of driving groove wheels 16, and further improving the coaxiality of the rod 7 and the stirring head 2.

[0046] As an embodiment of the present invention, a friction heat additive manufacturing method is also proposed, which uses the friction heat additive manufacturing device described above, including the following steps: Step 1: Fix the substrate on the clamping fixture; Step 2: Pass the rod 7 through the two sets of clamping assemblies, and make the lower end of the rod 7 abut against the inside of the stirring head 2; Step 3: Control the clamping assembly and the adjustment structure to drive the rod 7 toward the stirring head 2 while rotating the stirring head 2 to plasticize the rod 7 through frictional heat generation; Step 4: Control the stirring head 2 to move along the length direction of the substrate to perform continuous material addition.

[0047] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0048] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A friction heat additive manufacturing device, characterized in that: include: A bracket (1), wherein a stirring head (2) is rotatably mounted on the bracket (1); An auxiliary material discharge structure is arranged in the stirring head (2), and the auxiliary material discharge structure can drive the plasticized material inside the stirring head (2) to move towards the lower end of the stirring head (2); two groups of clamping assemblies are provided and mounted on the support (1), the two groups of clamping assemblies are used to clamp the rod (7) so that the rod (7) and the stirring head (2) are coaxial, and one group of the clamping assemblies can control the rotation speed of the stirring head (2) through an adjustment structure provided on the support (1); A folding structure connects the two groups of clamping assemblies, and the folding structure can increase the clamping force of the two groups of clamping assemblies on the rod (7) and increase the rotation speed of the stirring head (2) when the two groups of clamping assemblies move away from each other.

2. A friction heat additive manufacturing device according to claim 1, characterized in that: A first inner conical surface (201) is provided in the stirring head (2), and the first inner conical surface (201) can plasticize the rod (7) by rubbing against the rod (7); The auxiliary material discharge structure comprises a second inner conical surface (202) arranged in the stirring head (2) and extending to the lower end of the stirring head (2), and a plurality of groups of inclined baffles (3) are arranged at equal intervals in a circumference in the second inner conical surface (202).

3. The friction heat additive manufacturing device according to claim 1, characterized in that: The lower end of the stirring head (2) is also provided with a plurality of groups of bosses (4) and a plurality of groups of arc grooves (203) extending outward from the center at equal intervals in a circumferential manner.

4. The friction heat additive manufacturing device according to claim 1, characterized in that: The two groups of clamping assemblies are arranged along the vertical direction of space, and the clamping assembly located at the upper part is provided with a second sliding connection part (21), and the second sliding connection part (21) is slidably connected to a second vertical groove (102) provided on the bracket (1); The adjustment structure comprises a gear switch (23) and a first motor (6) fixedly mounted on the bracket (1), wherein the first motor (6) is electrically connected to the gear switch (23); The gear switch (23) is connected to the second sliding connection part (21) via a pull wire (22), and the first motor (6) is connected to the stirring head (2) via a first belt (5).

5. The friction heat additive manufacturing device according to claim 1, characterized in that: The clamping assembly comprises a connecting frame (8) arranged on the bracket (1), two groups of first slide grooves (801) are symmetrically arranged on the connecting frame (8), two groups of first sliding blocks (11) are slidably mounted in the first sliding grooves (801), and a driving groove wheel (16) is rotatably mounted on the first sliding block (11); The clamping assembly further comprises an elastic structure for driving the two groups of the first sliding blocks (11) to move towards each other, and a hinge structure connected to the two groups of the first sliding blocks (11).

6. The friction heat additive manufacturing device according to claim 5, characterized in that: The elastic structure comprises a transverse shaft (9) fixedly mounted in the first sliding groove (801) and slidably connected to the first sliding block (11); the transverse shaft (9) is also sleeved with a columnar spring (10); one end of the columnar spring (10) is connected to the first sliding block (11), and the other end is connected to the folding structure.

7. The friction heat additive manufacturing device according to claim 5, characterized in that: The hinged structure comprises a second slide groove (802) which is opened on the connecting frame (8) and is perpendicular to the first slide groove (801); a third slider (15) is slidably installed in the second slide groove (802); a pulling rod (14) is symmetrically rotatably installed on the third slider (15); and one end of the pulling rod (14) away from the third slider (15) is rotatably connected to the first slider (11).

8. The friction heat additive manufacturing device according to claim 6, characterized in that: The folding structure comprises a second slider (12) arranged in the first sliding groove (801) and slidably connected to the transverse axis (9), the second slider (12) being connected to an end of the cylindrical spring (10) away from the first slider (11), and a convex shaft (13) being rotatably mounted on the second slider (12); The folding structure further comprises a connecting plate (19) arranged on the bracket (1), a first sliding connection portion (20) being formed at one end of the connecting plate (19), the first sliding connection portion (20) being slidably connected to a first vertical groove (101) arranged on the bracket (1); The first sliding connection portion (20) is also symmetrically provided with inclined grooves (1901), and the convex shaft (13) is capable of rolling in the inclined grooves (1901).

9. A friction heat additive manufacturing method, characterized in that: The friction heat additive manufacturing device according to any one of claims 1 to 8 comprises the following steps: Step 1: Fix the substrate on the clamping fixture; Step 2: Pass the rod (7) through the two sets of clamping components, and make the lower end of the rod (7) abut against the inside of the stirring head (2); Step 3: Controlling the movement of the clamping assembly and the adjusting structure to drive the rod (7) to move toward the stirring head (2) while rotating the stirring head (2) to plasticize the rod (7) by generating heat through friction; Step 4: Control the stirring head (2) to move along the length direction of the substrate to perform continuous material addition.

Images