Forming head and device for solid phase additive material

Abstract

The forming head comprises a material bearing assembly, the material bearing assembly comprises a feeding cavity, a friction cavity and a discharging cavity which are sequentially arranged, the feeding cavity can be communicated with additive materials, a material conveying assembly is arranged in the material bearing assembly, the material conveying assembly comprises a friction section, a friction external thread is arranged on the friction section, and the friction external thread is connected with the friction section. A friction space exists between the friction section and the friction cavity, the friction space is gradually narrowed in the direction close to the discharging cavity, the material conveying assembly is driven by the driving assembly to rotate relative to the material bearing assembly, and the additive materials entering the material bearing assembly from the feeding cavity move towards the discharging cavity along the friction external threads; through relative rotation between the friction external thread and the friction cavity, the material has the trend of moving towards the narrow part of the friction space, the friction cavity and the friction section can fully extrude and rub the additive material, the physical characteristics of the additive material are improved, and the additive manufacturing forming effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to solid phase additive manufacturing field especially relates to a kind of forming head and device for solid phase additive. BACKGROUND

[0002] Solid phase additive involves the way of realizing plastic deformation and material connection by stirring and friction in the solid state of material, and this technology is usually used in metal additive manufacturing and welding.

[0003] The friction effect of the existing solid phase additive manufacturing equipment on additive material is not good, and the friction effect on the material is limited, which affects the quality of additive manufacturing. UTILITY MODEL CONTENT

[0004] To solve the above technical problems, on the one hand, the utility model provides a kind of forming head for solid phase additive, comprising:

[0005] Material receiving assembly, the material receiving assembly includes sequentially arranged feeding cavity, friction cavity and discharge cavity, the feeding cavity can be communicated with additive material;

[0006] Material conveying assembly, the material conveying assembly is arranged in the material receiving assembly, the material conveying assembly includes friction section, the friction section is provided with friction external thread, there is friction space between the friction section and the friction cavity, the friction space gradually shrinks along the first direction, the first direction is the direction along the feeding cavity to the discharge cavity;

[0007] Driving assembly, for driving the material conveying assembly relative to the material receiving assembly rotation;

[0008] Wherein, under the rotation of the material conveying assembly, the friction external thread exerts conveying force along the first direction on the additive material.

[0009] Preferably, the thread tooth surface of the friction external thread on the side close to the discharge cavity is perpendicular to the first direction, and the thread tooth surface on the side close to the feeding cavity gradually approaches the first direction from the root to the top.

[0010] Preferably, the diameter of the inner wall surface of the friction cavity and the diameter of the outer wall surface of the friction section gradually decrease along the first direction.

[0011] Preferably, the inner wall surface of the friction cavity and the outer wall surface of the friction section are both tapered surfaces gradually shrinking along the first direction, and the taper of the tapered surface of the friction cavity is greater than the taper of the tapered surface of the friction section.

[0012] Preferably, the feeding assembly further comprises a feeding section and a discharging section, the feeding section, the friction section and the discharging section are arranged in sequence along the first direction, a feeding outer thread is arranged on the feeding section, a discharging outer thread is arranged on the discharging section, and the feeding outer thread, the friction outer thread and the discharging outer thread have the same rotation direction.

[0013] Under the rotation of the feeding assembly, the feeding outer thread, the friction outer thread and the discharging outer thread exert a conveying force on the additive material along the first direction.

[0014] Preferably, the diameter of the feeding section is greater than the maximum diameter of the friction section, and the diameter of the discharging section is less than or equal to the minimum diameter of the friction section.

[0015] Preferably, the pitch and height of the teeth of the feeding outer thread are greater than those of the friction outer thread and the discharging outer thread.

[0016] Preferably, the feeding assembly further comprises a stirring section, and the stirring section comprises a plurality of shaped heads extending downward from the bottom surface of the discharging section.

[0017] Preferably, the feeding cavity comprises a storage area in communication with the additive material and capable of storing the additive material.

[0018] In another aspect, the utility model also provides an additive device for solid-phase additive, and the device discharges by using the shaped head according to any one of the above.

[0019] According to the technical scheme, the feeding assembly comprises a feeding cavity, a friction cavity and a discharging cavity, the feeding assembly comprises a friction section, the additive material passes through a friction space composed of the friction cavity and the friction section when flowing from the feeding cavity to the discharging cavity, the friction space gradually narrows along the direction from the feeding cavity to the discharging cavity, the friction outer thread is arranged on the friction section, when the feeding assembly rotates in the feeding assembly, the friction outer thread exerts a conveying force on the additive material in the friction space to the discharging cavity, so that the additive material has a tendency to move to the narrow part of the friction space, and then the additive material can closely adhere to the wall surface of the friction space, therefore, the friction cavity, the friction section and the friction outer thread can sufficiently extrude and rub the additive material, more heat is generated, the physical properties of the additive material can be improved, and the additive manufacturing forming effect is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is the overall structure of the shaped head for solid-phase additive provided by an embodiment of the utility model, and is a sectional view of the overall structure of the shaped head for solid-phase additive;

[0021] Figure 2It is the structural schematic view of the material receiving assembly of the forming head for solid phase additive provided by an embodiment of the utility model;

[0022] Figure 3 It is the structural schematic view of the material feeding assembly of the forming head for solid phase additive provided by an embodiment of the utility model;

[0023] Wherein: 1, material receiving assembly;11, feed cavity;111, storage area;12, friction cavity;13, discharge cavity;2, material feeding assembly;21, feed section;22, friction section;23, discharge section;24, stirring section;25, connecting section;3, drive assembly;4, material inlet;5, friction space. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantage of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0025] Figure 1 It is the sectional view of the overall structure for solid phase additive provided by an embodiment of the utility model; Figure 2 It is the structural schematic view of the material receiving assembly of the forming head for solid phase additive provided by an embodiment of the utility model; Figure 3 It is the structural schematic view of the material feeding assembly of the forming head for solid phase additive provided by an embodiment of the utility model.

[0026] As Figures 1 to 3 The utility model embodiment provides a kind of forming head for solid phase additive, including material receiving assembly 1, material feeding assembly 2 and drive assembly 3, material receiving assembly 1 includes feed cavity 11, friction cavity 12 and discharge cavity 13, feed cavity 11, friction cavity 12 and discharge cavity 13 are sequentially arranged, feed cavity 11 can be communicated with additive material, such as Figure 1 Material inlet 4, material feeding assembly 2 is located in material receiving assembly 1, material feeding assembly 2 includes friction section 22, and friction space 5 is formed between friction section 22 and friction cavity 12, with the direction of feed cavity 11 pointing to discharge cavity 13 as first direction, the space of friction space 5 gradually contracts along first direction.

[0027] Drive assembly 3 can drive the rotation of material feeding assembly 2 in material receiving assembly 1, and additive material entering material receiving assembly 1 from feed cavity 11 is discharged from discharge cavity 13 along the friction outer thread of friction section 22.

[0028] The additive material moves along the feeding cavity 11 to the discharging cavity 13 in the material receiving assembly 1, and when passing through the friction cavity 12 and the friction space 5, the space of the friction space 5 gradually shrinks along with the movement of the additive material, so that the additive material is more closely attached to the friction section 22 and the friction cavity 12, and the interaction force gradually increases, so that the friction section 22, the friction outer thread and the friction cavity 12 can sufficiently extrude and rub the additive material, and the materials inside also rub each other when flowing to the narrow area, so that the additive material has better physical properties, and the additive manufacturing effect can be improved.

[0029] The additive material can be selected from metal powder such as aluminum alloy, nickel alloy, or other suitable materials. Since the powder has a small particle size and is uniform, the powder inside can be sufficiently rubbed when the powder material is extruded in the friction space, and the small particle size powder can be more fully plasticized after being extruded and rubbed, thereby improving the additive forming effect. It should be noted that the forming head provided in the embodiment of the utility model can also be used for other forms of materials, such as welding wires, and can also achieve more sufficient friction and extrusion effect on the welding wires.

[0030] In addition, the wall surface of the friction cavity 12 and the friction section 22 can be a tapered surface as shown in Figure 1 , or any shaped surface, as long as the inner wall of the friction cavity 12 and the outer wall of the friction section 22 gradually approach along the first direction, so that the friction space 5 gradually shrinks along the first direction.

[0031] It should be noted that the outer thread mentioned here can be a standard mechanical thread, or any structure with a spiral shape, for example, a spiral groove is formed on the friction section 22, and when the material feeding assembly 2 rotates, the spiral groove on the friction section 22 applies a conveying force along the first direction to the additive material; or a pressure plate arranged in a spiral shape is installed on the friction section 22, and when the material feeding assembly 2 rotates, the spiral pressure plate on the friction section 22 applies a conveying force along the first direction to the additive material. That is, as long as the spiral structure applies a conveying force to the additive material when rotating, so that the additive material moves to a narrower area in the friction space 5, it should fall within the protection scope of the present application.

[0032] As shown in Figure 1 and Figure 3As shown, in one of the preferred embodiments, the friction outer thread on the friction section 22 has the thread flanks on the side close to the discharge cavity 13 perpendicular to the first direction, and the thread flanks on the side close to the feed cavity 11 gradually close to the first direction from the root to the crest, and the additive material is in contact with the thread flanks on the side close to the feed cavity 11 below and the thread flanks on the side close to the discharge cavity 13 above, so that the friction outer thread exerts stronger conveying force on the additive material along the first direction when rotating, and the additive material is less likely to flow back and overflow.

[0033] Specifically, as shown in FIG. 1, the first direction is the vertical downward direction, and the thread flanks on the lower side of the friction outer thread on the friction section 22 are horizontal, and the thread flanks on the upper side are inclined. Figure 1 As shown in FIG. 1, the first direction is the vertical downward direction, and the thread flanks on the lower side of the friction outer thread on the friction section 22 are horizontal, and the thread flanks on the upper side are inclined.

[0034] In addition, the thread flanks on the side close to the feed cavity 11 of the friction section 22 can be inclined as shown in the drawings, or can be curved as a whole and tend to be close to the first direction.

[0035] As shown in FIG. 1, the first direction is the vertical downward direction, and the thread flanks on the lower side of the friction outer thread on the friction section 22 are horizontal, and the thread flanks on the upper side are inclined. Figure 1 As shown in FIG. 1, in one of the preferred embodiments, the inner wall surface of the friction cavity 12 and the outer wall surface of the friction section 22 are both conical surfaces, and the taper of the conical inner surface of the friction cavity 12 is greater than the taper of the conical outer surface of the friction section 22, that is, in the radial cross section of the material conveying assembly 2, the inclined inner wall of the friction cavity 12 and the inclined outer wall of the friction section 22 form an opening upwardly inclined angle, which further improves the volume change rate of the additive material when moving downward in the conical annular material containing space, thereby improving the friction and extrusion effect on the additive material. The top angle of the conical surface of the friction section 22 can be 60 to 65 degrees, and the top angle of the conical surface of the friction cavity 12 can be 3 to 5 degrees larger than that of the friction section 22.

[0036] As shown in FIG. 1, the first direction is the vertical downward direction, and the thread flanks on the lower side of the friction outer thread on the friction section 22 are horizontal, and the thread flanks on the upper side are inclined. Figure 1 As shown in FIG. 1, the first direction is the vertical downward direction, and the thread flanks on the lower side of the friction outer thread on the friction section 22 are horizontal, and the thread flanks on the upper side are inclined. Figure 3As shown, in one of the preferred embodiments, the feeding component 2 also includes a feeding section 21 and a discharging section 23. The feeding section 21, the friction section 22, and the discharging section 23 are arranged in sequence from top to bottom. The feeding section 21 and the discharging section 23 are respectively provided with a feeding external thread and a discharging external thread, and the feeding external thread, the friction external thread and the discharging external thread have the same rotation direction. When the feeding component 2 rotates in the material receiving component 1, the additive material flows under the threaded conveying action of the feeding section 21, the friction section 22 and the discharging section 23.

[0037] Among them, the axial length of the discharge section 23 can be set relatively short. Since the additive material has undergone sufficient friction and extrusion in the friction section 22 and obtained good physical properties, it is necessary to discharge the material as soon as possible for additive processing to avoid the material staying in the material receiving component 1 for a long time and cooling, resulting in the loss of good physical properties.

[0038] Further, such as Figure 3 As shown, the diameter of the feed section 21 can be set to be larger than the maximum diameter of the friction section 22, and the diameter of the discharge section 23 can be smaller than or equal to the minimum diameter of the friction section 22, so that there is an annular platform between the lower surface of the feed section 21 and the friction section 22. When the additive material enters the material receiving component 1, the presence of the annular platform can block the upward movement of the material, effectively avoiding the situation in which the material accumulates at the bottom and overflows upward from the gap under pressure during the process of conveying and compacting the material, thereby improving the conveying efficiency and the material pre-compacting effect.

[0039] It is also possible to set the pitch and tooth height of the feed external thread of the feed section 21 to be greater than the pitch and tooth height of the friction external thread and the discharge external thread, such as Figure 3 As shown, the pressure of the feed external thread on the additive material can be increased, further enhancing the extrusion friction effect on the additive material in the friction space 5. It can also improve the material conveying efficiency, further block the upward movement of the material, and effectively prevent the material from overflowing.

[0040] Furthermore, the feed section 21, the friction section 22, and the discharge section 23 can be integrally formed or can be a detachably connected structure. In this case, a variety of specifications of the feed section 21, the friction section 22, and the discharge section 23 can be provided. For example, the feed section 21 and the discharge section 23 can have different diameters, shaft lengths, and thread dimensions. The friction section 22 can have different tapers, top and bottom diameters, shaft lengths, and thread dimensions. A variety of feed sections 21, friction sections 22, and discharge sections 23 can be interchangeable to meet different additive processing requirements.

[0041] like Figure 3As shown in one of the preferred embodiments, the feeding assembly 2 further comprises a stirring section 24, the stirring section 24 comprises a plurality of stirring heads extending downward from the bottom surface of the discharging section 23, the stirring heads can be cylindrical or teardrop-shaped, in the additive material discharging from the stirring heads during the additive forming process, the stirring section 24 can be inserted and stirred in the previously deposited layer, additional stirring and friction of the additive material can be generated, additional friction heat can be generated for promoting the material plastic deformation process, while helping to reduce pore defects and promote the metallurgical bonding of adjacent deposited layers.

[0042] As shown in one of the preferred embodiments, the feeding assembly 2 further comprises a stirring section 24, the stirring section 24 comprises a plurality of stirring heads extending downward from the bottom surface of the discharging section 23, the stirring heads can be cylindrical or teardrop-shaped, in the additive material discharging from the stirring heads during the additive forming process, the stirring section 24 can be inserted and stirred in the previously deposited layer, additional stirring and friction of the additive material can be generated, additional friction heat can be generated for promoting the material plastic deformation process, while helping to reduce pore defects and promote the metallurgical bonding of adjacent deposited layers. Figure 1 As shown in one of the preferred embodiments, the feeding assembly 2 further comprises a stirring section 24, the stirring section 24 comprises a plurality of stirring heads extending downward from the bottom surface of the discharging section 23, the stirring heads can be cylindrical or teardrop-shaped, in the additive material discharging from the stirring heads during the additive forming process, the stirring section 24 can be inserted and stirred in the previously deposited layer, additional stirring and friction of the additive material can be generated, additional friction heat can be generated for promoting the material plastic deformation process, while helping to reduce pore defects and promote the metallurgical bonding of adjacent deposited layers.

[0043] In one specific embodiment, the forming head for solid-phase additive provided by the embodiments of the present application can be used in a solid-phase additive device, the solid-phase additive device can comprise a solid-phase additive machine tool, the machine tool spindle is connected with the connecting section 25 of the feeding assembly 2, the material receiving assembly 1 can be placed on the tooling of the workbench of the machine tool, the workpiece to be subjected to additive processing is placed on the workbench, the rotation of the feeding assembly 2 is driven by the machine tool spindle, the additive material in the material receiving assembly 1 is discharged from the forming head and the material is subjected to sufficient friction and extrusion, which can improve the processing effect on the workpiece.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application rather than limit. Although the present application has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A forming head for solid phase additive manufacturing, characterized in that: include: A material receiving assembly, the material receiving assembly comprising a feed chamber, a friction chamber, and a discharge chamber arranged in sequence, the feed chamber being able to communicate with the additive material; A feeding assembly is disposed in the material receiving assembly, the feeding assembly includes a friction section, the friction section is provided with a friction external thread, a friction space exists between the friction section and the friction chamber, the friction space gradually shrinks along a first direction, the first direction is a direction from the feed chamber to the discharge chamber; A driving assembly, used for driving the feeding assembly to rotate relative to the receiving assembly; Wherein, under the rotation action of the feeding assembly, the friction external thread applies a conveying force along the first direction to the additive material.

2. The forming head according to claim 1, characterized in that The thread surface of the friction external thread close to the discharge cavity is perpendicular to the first direction, and the thread surface close to the feed cavity gradually closes to the first direction from the tooth bottom to the tooth top.

3. The forming head according to claim 1, characterized in that The diameter of the inner wall surface of the friction chamber and the diameter of the outer wall surface of the friction section both gradually decrease along the first direction.

4. The forming head according to claim 3, characterized in that The inner wall surface of the friction chamber and the outer wall surface of the friction section are both conical surfaces that gradually shrink along the first direction, and the taper of the conical surface of the friction chamber is greater than the taper of the conical surface of the friction section.

5. The forming head according to claim 1, characterized in that The feeding assembly further includes a feeding section and a discharging section, wherein the feeding section, the friction section, and the discharging section are sequentially arranged along the first direction, the feeding section is provided with a feeding external thread, and the discharging section is provided with a discharging external thread, and the feeding external thread, the friction external thread, and the discharging external thread have the same rotation direction; Under the rotation of the feeding assembly, the feeding external thread, the external thread, and the discharging external thread exert a conveying force on the additive material along the first direction.

6. The forming head according to claim 5, characterized in that The diameter of the feed section is greater than the maximum diameter of the friction section, and the diameter of the discharge section is less than or equal to the minimum diameter of the friction section.

7. The forming head according to claim 6, characterized in that The pitch and height of the feed external thread are both greater than the pitch and height of the friction external thread and the discharge external thread.

8. The forming head according to claim 5, characterized in that The material feeding component further includes a stirring section, which includes a plurality of stirring heads extending downward from the bottom surface of the material discharging section.

9. The forming head according to claim 1, characterized in that The feed chamber includes a storage area, which is in communication with the additive material and can store the additive material.

10. A device for solid phase additive manufacturing, characterized in that: The device uses the forming head according to any one of claims 1 to 9 to discharge materials.

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