Stirring head for improving interlayer bonding capacity of stirring friction additive

Abstract

The stirring head comprises a stirring head body, a conveying channel used for conveying additive raw materials is formed in the stirring head body, a plurality of protrusions are arranged on the lower end face of the stirring head body, and the protrusions are distributed at intervals along the periphery of an outlet of the conveying channel. The side faces of the multiple protrusions are provided with spiral grooves used for making additive raw materials flow downwards. According to the method, the interlayer bonding capacity of the additive component can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of friction stir additives, and in particular to a stirring head for improving the interlayer bonding ability of friction stir additives. Background Art

[0002] Friction stir additive manufacturing is a solid-phase additive manufacturing technology that uses the friction of the stirring head to generate heat to thermally plasticize the additive raw materials, thereby achieving deposition additive. At present, the additive stirring head can achieve layer-by-layer deposition of materials, but there are problems in friction stir additive manufacturing such as insufficient interlayer material flow and poor interlayer bonding ability. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a stirring head for improving the interlayer bonding ability of a friction stir additive, which can effectively improve the interlayer bonding ability of an additive component.

[0004] A stirring head for improving the interlayer bonding ability of a friction stir additive according to an embodiment of the present invention comprises:

[0005] A stirring head body, wherein a conveying channel for conveying additive raw materials is provided inside the stirring head body, and an outlet of the conveying channel is located at the lower end surface of the stirring head body; a plurality of protrusions are provided on the lower end surface of the stirring head body, and the plurality of protrusions are spaced apart along the periphery of the outlet of the conveying channel, and the sides of the plurality of protrusions are provided with spiral grooves for allowing the additive raw materials to flow downward.

[0006] When in use, the stirring head body is coaxially installed on the additive spindle. The stirring head body rotates driven by the additive spindle, and the additive raw material rod is extruded downward through the additive raw material channel. The extruded additive raw material heats up and is thermoplasticized under the action of friction and deformation. The thermoplasticized material gathers toward the center, interacts with the raised spiral groove, and flows to the lower layer, thereby significantly and effectively promoting the interlayer flow of the material and effectively improving the interlayer bonding strength of the material.

[0007] The stirring head for improving the interlayer bonding ability of stir friction additive in the embodiment of the present invention has the following advantages: by arranging multiple protrusions at intervals along the outlet periphery of the conveying channel on the lower end surface of the stirring head body and arranging specific spiral grooves on the sides of the multiple protrusions, it can significantly and effectively promote the flow of thermoplasticized material to the lower layer (i.e., longitudinal flow) during the additive process, thereby significantly and effectively promoting the interlayer flow of the material and effectively improving the interlayer bonding strength.

[0008] In some embodiments, the plurality of protrusions are closely attached to the outlet edge of the delivery channel and are evenly spaced apart.

[0009] In some embodiments, the shape of the protrusion includes but is not limited to a semi-conical shape, a complete truncated cone shape, a cone shape, and a teardrop shape.

[0010] In some embodiments, the height of the protrusion is 1.5-2.5 mm.

[0011] In some embodiments, the thread direction of the spiral groove and the rotation direction of the stirring head body satisfy: the stirring head body rotates to screw out the thread. If the thread is a left-handed thread, the stirring head body rotates clockwise; if the thread is a right-handed thread, the stirring head body rotates counterclockwise.

[0012] In some embodiments, the outer side of the lower end surface of the stirring head body is further provided with a plurality of radially extending spiral ribs spaced around the conveying channel, and the rotation direction of the plurality of spiral ribs is consistent with the thread direction of the spiral groove.

[0013] In some embodiments, the plurality of spiral ribs are evenly spaced apart along the circumference of the lower end surface of the stirring head body.

[0014] In some embodiments, the cross-section of the spiral rib includes, but is not limited to, a rectangle, a trapezoid, a triangle, or a circle.

[0015] In some embodiments, the height of the spiral rib is 0.2-0.8 mm.

[0016] In some embodiments, one end of the spiral rib is flush with the outer edge of the lower end surface of the stirring head body, and the other end of the spiral rib extends to the middle between the outer edge of the lower end surface of the stirring head body and the outlet edge of the conveying channel.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 Schematic diagram of a stirring head for improving the interlayer bonding ability of a friction stir additive according to an embodiment of the present invention.

[0020] Reference numerals:

[0021] The stirring head body 1; the conveying channel 10; the upper shaft section 11; the flange 12; the countersunk hole 121; the lower shaft section 13; the protrusion 131; the spiral groove 1311; and the spiral rib 132. DETAILED DESCRIPTION

[0022] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0023] Combine the following Figure 1 The stirring head for improving the interlayer bonding ability of the friction stir additive material according to an embodiment of the present invention is described.

[0024] like Figure 1 As shown, a stirring head for improving the interlayer bonding ability of stir friction additive materials according to an embodiment of the present invention includes a stirring head body 1, a conveying channel 10 for conveying additive raw materials is opened inside the stirring head body 1, and the outlet of the conveying channel is located at the lower end surface of the stirring head body 1. A plurality of protrusions 131 are arranged on the lower end surface of the stirring head body 1, and the plurality of protrusions 131 are distributed at intervals along the periphery of the outlet of the conveying channel 10, that is, the plurality of protrusions 1 are distributed around the outlet edge of the conveying channel 10, and can be close to the outlet edge of the conveying channel 10, or can be arranged adjacent to the outlet edge of the conveying channel 10, and the sides of the plurality of protrusions 131 are provided with spiral grooves 1311 for allowing the additive raw materials to flow downward.

[0025] When in use, the stirring head body 1 is coaxially installed on the additive spindle. The stirring head body 1 rotates driven by the additive spindle, and the additive raw material rod is extruded downward through the additive raw material channel. The extruded additive raw material heats up and is thermoplasticized under the action of friction and deformation. The thermoplasticized material gathers toward the center, interacts with the spiral groove 1311 of the protrusion 131, and flows to the lower layer, thereby significantly and effectively promoting the interlayer flow of the material and effectively improving the interlayer bonding force of the material.

[0026] The stirring head for improving the interlayer bonding ability of stir friction additive in the embodiment of the present invention has the following advantages: by arranging multiple protrusions 131 at intervals along the outlet periphery of the conveying channel 10 on the lower end surface of the stirring head body 1 and arranging specific spiral grooves 1311 on the sides of the multiple protrusions 131, it can significantly and effectively promote the flow of thermoplasticized material to the lower layer (i.e., longitudinal flow) during the additive process, thereby significantly and effectively promoting the interlayer flow of the material and effectively improving the interlayer bonding force.

[0027] In some embodiments, the plurality of protrusions 131 are close to the outlet edge of the delivery channel 10 and are evenly spaced, and the spacing includes but is not limited to 180°, 120°, 90°, etc. For example, Figure 1It is shown that two semi-conical protrusions 131 with a circumferential spacing of 180° are closely attached to the outlet edge of the conveying channel 10, and the arc-shaped side surfaces of the two semi-conical protrusions 131 are facing away from the conveying channel 10. The spiral grooves 1311 are arranged on the arc-shaped side surfaces of the protrusions 1311, which can effectively promote the flow of interlayer materials during the additive process and effectively improve the bonding force between material layers. In some other embodiments, the protrusions 131 may not be closely attached to the outlet edge of the conveying channel 10 but are relatively close to the outlet edge of the conveying channel 10, which can also effectively promote the flow of interlayer materials during the additive process.

[0028] In some embodiments, the shape of the protrusion 131 includes but is not limited to a semi-conical shape, a complete truncated cone shape, a cone shape, and a teardrop shape. These appropriately shaped protrusions 131 can efficiently promote the flow of interlayer materials during the additive process and effectively improve the bonding strength between material layers.

[0029] In some embodiments, the height of the protrusion 131 is 1.5 to 2.5 mm. For example, the height of the protrusion 131 can be 1.5 mm, 1.8 mm, 2.0 mm, 2.3 mm, 2.5 mm, etc. The height of the protrusion 131 is between 1.5 and 2.5 mm, which can efficiently promote the flow of interlayer materials in the additive process and effectively improve the bonding strength between material layers.

[0030] In some implementations, the thread direction of the spiral groove 1311 and the rotation direction of the stirring head body 1 satisfy: the stirring head body 1 rotates to unscrew the thread, if the thread is a left-hand thread, the stirring head body 1 rotates clockwise, if the thread is a right-hand thread, the stirring head body 1 rotates counterclockwise. In this way, the interlayer material flow in the additive process can be efficiently promoted, and the interlayer bonding force of the material can be effectively improved.

[0031] In some embodiments, the outer portion of the lower end surface of the mixing head body 1 is further provided with a plurality of radially extending spiral ribs 132 spaced around the delivery channel 10, and the rotation direction of the plurality of spiral ribs 132 is the same as the thread direction of the spiral groove 1311. When the mixing head body 1 rotates, the additive raw material extruded from the delivery channel 10 of the additive raw material gathers toward the center of the mixing head body 1 under the interaction with the spiral ribs 132, thereby improving the constraint level of the material and reducing the degree of radial diffusion of the material; at the same time, the spiral groove 1311 on the protrusion 131 cooperates with the gathering effect of the spiral ribs 132 to better promote the interlayer bonding ability of the material.

[0032] In some embodiments, the plurality of spiral ribs 132 are evenly spaced along the circumference of the lower end surface of the stirring head body 1. The evenly spaced spiral ribs 132 can gather the material toward the center during the additive process without damaging the surface of the formed additive body.

[0033] In some embodiments, the spiral ribs 132 are in the form of straight strips arranged in a spiral shape, have a simple structure, and can gather the material toward the center during the additive process.

[0034] In some embodiments, the cross-section of the spiral rib 132 includes, but is not limited to, a rectangle, a trapezoid, a triangle, or a circle. These spiral ribs 132 of appropriate shapes can gather the material toward the center during the additive process without damaging the surface of the formed additive body.

[0035] In some embodiments, the height of the spiral rib 132 is 0.2-0.8 mm, for example, the height of the spiral rib 132 can be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm. The height of the spiral rib 132 is in the range of 0.2-0.8 mm, which can gather the material to the center during the additive process without damaging the surface of the formed additive body.

[0036] In some embodiments, one end of the spiral rib 132 is flush with the outer edge of the lower end surface of the stirring head body 1, and the other end of the spiral rib 132 extends to the middle between the outer edge of the lower end surface of the stirring head body 1 and the outlet edge of the conveying channel 10. In this way, the material can be gathered to the center during the material addition process.

[0037] In some embodiments, the stirring head body 1 includes an upper shaft section 11, a flange 12 and a lower shaft section 13 connected in sequence, and the lower end surface of the lower shaft section 13 is the lower end surface of the stirring head body 1. Among them, the upper shaft section 11 is used to be inserted into the additive spindle, and the flange is used to be fixed to the additive spindle. When used specifically, the upper shaft section 11 is inserted into the additive spindle, and the flange 12 and the axially extending and circumferentially spaced countersunk holes 121 on the flange 12 are connected and fixed by inserting bolts into the countersunk holes 121 and the mounting holes corresponding to the countersunk holes 121 on the additive spindle, so as to ensure that the stirring head body 1 is connected to the additive spindle with a certain coaxiality.

[0038] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0039] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A stirring head for improving the interlayer bonding ability of stir friction additive, characterized in that: include: A stirring head body, wherein a conveying channel for conveying additive raw materials is provided inside the stirring head body, and an outlet of the conveying channel is located at the lower end surface of the stirring head body; a plurality of protrusions are provided on the lower end surface of the stirring head body, and the plurality of protrusions are spaced apart along the periphery of the outlet of the conveying channel, and the sides of the plurality of protrusions are provided with spiral grooves for allowing the additive raw materials to flow downward.

2. The stirring head for improving the interlayer bonding ability of the friction stir additive according to claim 1, characterized in that: The plurality of protrusions are closely attached to the outlet edge of the conveying channel and are evenly spaced.

3. The stirring head for improving the interlayer bonding ability of the friction stir additive according to claim 1, characterized in that: The shape of the protrusion includes but is not limited to a semi-truncated cone, a complete truncated cone, a cone, and a water drop shape.

4. The stirring head for improving the interlayer bonding ability of the friction stir additive according to claim 1, characterized in that: The height of the protrusion is 1.5 to 2.5 mm.

5. The stirring head for improving the interlayer bonding ability of the friction stir additive according to claim 1, characterized in that: The thread direction of the spiral groove and the rotation direction of the stirring head body satisfy: the stirring head body rotates to unscrew the thread, if the thread is a left-handed thread, the stirring head body rotates clockwise, if the thread is a right-handed thread, the stirring head body rotates counterclockwise.

6. The stirring head for improving the interlayer bonding ability of the friction stir additive according to any one of claims 1 to 5, characterized in that: The outer portion of the lower end surface of the stirring head body is also provided with a plurality of radially extending spiral ribs spaced around the conveying channel, and the rotation direction of the plurality of spiral ribs is consistent with the thread direction of the spiral groove.

7. The stirring head for improving the interlayer bonding ability of the friction stir additive according to claim 6, characterized in that: The plurality of spiral ribs are evenly spaced along the circumferential direction of the lower end surface of the stirring head body.

8. The stirring head for improving the interlayer bonding ability of the friction stir additive according to claim 6, characterized in that: The cross-section of the spiral rib includes but is not limited to a rectangle, a trapezoid, a triangle, and a circle.

9. The stirring head for improving the interlayer bonding ability of the friction stir additive according to claim 6, characterized in that: The height of the spiral rib is 0.2-0.8 mm.

10. The stirring head for improving the interlayer bonding ability of the friction stir additive according to claim 6, characterized in that: One end of the spiral rib is flush with the outer edge of the lower end surface of the stirring head body, and the other end of the spiral rib extends to the middle between the outer edge of the lower end surface of the stirring head body and the outlet edge of the conveying channel.

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