阅读说明：本技术 一种基于新型液压技术的石墨烯铝复合材料制备搅拌头 (Graphene-aluminum composite material preparation stirring head based on novel hydraulic technology ) 是由 吴奇 蔡鹏飞 刘林傲 高继溟 龙连春 于 2021-08-24 设计创作，主要内容包括：一种基于新型液压技术的石墨烯铝复合材料制备搅拌头,属于材料制备技术领域。主要由圆柱形夹持柄、轴肩、搅拌针和液压系统组成。其中在搅拌头内部设计了三个沿轴线方向贯穿圆柱的圆柱槽,通过开孔联通,并且顶部使用螺栓密封；中间液压孔内充满高膨胀度的煤油,底部和顶部密封,两侧物料孔内填充流动性较好的石墨烯片与铝粉的混合粉末,底部使用焊锡密封,加工时温度升高焊锡自动脱落,原本密闭的空间被打开；在搅拌摩擦升温过程中煤油升温膨胀,体积增大将混合粉末挤压进焊缝,达到加入增强相的目的。本发明利用搅拌摩擦技术结合新型液压搅拌头能够有效的提高生产效率,降低生产成本。(A graphene-aluminum composite material preparation stirring head based on a novel hydraulic technology belongs to the technical field of material preparation. Mainly comprises a cylindrical clamping handle, a shaft shoulder, a stirring pin and a hydraulic system. Wherein, three cylindrical grooves which penetrate through the cylinder along the axial direction are designed in the stirring head and communicated through the open holes, and the top of the stirring head is sealed by bolts; the middle hydraulic hole is filled with kerosene with high expansion degree, the bottom and the top are sealed, the material holes on the two sides are filled with mixed powder of graphene sheets and aluminum powder with better fluidity, the bottom is sealed by soldering tin, the soldering tin automatically falls off when the temperature is raised during processing, and the originally sealed space is opened; in the stirring friction heating process, the kerosene heats up and expands, the volume is increased, and the mixed powder is extruded into a welding line, so that the purpose of adding the reinforcing phase is achieved. The invention can effectively improve the production efficiency and reduce the production cost by combining the stirring friction technology with the novel hydraulic stirring head.)

1. A novel hydraulic technology-based graphene-aluminum composite material preparation stirring head is characterized in that a main structure is a clamping handle, the clamping handle is of a cylindrical structure, a hydraulic hole is formed in the center of an axis of the clamping handle, an upper port of the hydraulic hole, namely the upper end of the corresponding clamping handle, is provided with an opening, an upper port of the hydraulic hole is provided with a hydraulic hole screw for sealing, and a lower port of the hydraulic hole is end-capped, namely the lower port of the hydraulic hole does not penetrate through the lower end face of the clamping handle; two sides of a hydraulic hole in the clamping handle are symmetrically provided with a material hole parallel to the hydraulic hole respectively, the material hole penetrates through the upper end and the lower end of the clamping handle, and the upper port of each material hole is provided with a material hole screw; a communicating channel is arranged between the hydraulic hole at the upper part of the clamping handle and each material hole to communicate the hydraulic hole with the material holes, and a sealing ball capable of sliding or rolling along the communicating channel is arranged in each communicating channel; the lower end surface of the clamping handle, namely the center of the shaft shoulder, is provided with a stirring needle.

2. The stirring head prepared from the graphene-aluminum composite material based on the novel hydraulic technology is characterized in that a shaft shoulder, namely the lower end face of the clamping handle, is 20-25mm in diameter, and materials are prevented from splashing.

3. The stirring head prepared from the graphene-aluminum composite material based on the novel hydraulic technology is characterized in that the stirring pin is located right below the center of the shaft shoulder and is of a cone structure with a large upper end and a small lower end; the stirring pin is positioned between the two material holes.

4. The stirring head prepared from the graphene-aluminum composite material based on the novel hydraulic technology as claimed in claim 1, wherein the diameter of the sealing ball is equal to the inner diameter of the communicating channel, and the sealing ball can only move in the communicating channel.

5. The stirring head prepared from the graphene-aluminum composite material based on the novel hydraulic technology is characterized in that a hydraulic hole is filled with kerosene, and a material hole is filled with mixed powder of graphene and aluminum powder; and the inside of the communicating channel is limited by a sealing ball, kerosene is filled in a part close to the hydraulic hole, and mixed powder of graphene and aluminum powder is filled in a part close to the material hole.

6. The novel hydraulic technology-based graphene-aluminum composite material stirring head as claimed in claim 1, wherein the hole diameter of the hydraulic hole is larger than that of the material hole.

7. The novel hydraulic technology-based graphene-aluminum composite material stirring head is characterized in that the length of the working part of the stirring pin is smaller than the thickness of a plate to be processed.

8. The stirring head prepared from the graphene-aluminum composite material based on the novel hydraulic technology is characterized in that the outer surface of the outer shaft shoulder is coated with a wear-resistant anti-sticking coating to ensure the processing quality; the press-fitting acting surface between the stirring pin and the outer shaft shoulder is a plane.

9. The novel hydromechanical-based graphene-aluminum composite material stirring head is prepared according to claim 1, wherein the stirring pin is made of hard alloy; or the stirring pin comprises a steel substrate, and the outer surface of the steel substrate is coated with a titanium nitride coating.

10. The stirring head prepared from the graphene-aluminum composite material based on the novel hydraulic technology as claimed in claim 1 is characterized in that the tops of material holes on two sides are sealed by screws, so that mixed powder of graphene and aluminum can be conveniently added, the bottom of the material holes is sealed by soldering tin with a lower melting point, and the material holes can automatically fall off after the temperature of the stirring head rises to a certain degree, so that the mixed powder of graphene and aluminum powder inside the stirring head flows out.

Technical Field

The invention relates to the field of material processing, in particular to a graphene/Al composite material friction stir head based on a novel hydraulic design.

Background

The metal matrix composite material is widely applied to the fields of aerospace, automobile industry and the like with excellent performances such as higher strength-to-weight ratio, lower thermal expansion coefficient and the like. In recent years, the graphene reinforced metal matrix composite material has achieved great results, so that the composite material has greatly improved hardness, strength, wear resistance and the like. However, the development of the composite material is restricted by the problems of low density, difficult uniform dispersion, easy agglomeration, easy oxidation, interface reaction in the preparation process and the like of the graphene.

The Friction Stir Processing (FSP) is a technology developed on the basis of the basic concept of FSW and used for modifying and manufacturing a microstructure, the basic principle of the technology is that friction heat and mechanical stirring action are generated through high-speed rotation of a stirring head, a workpiece in a processing area is changed into a thermoplastic softening state, and a backward flowing material is recrystallized through the forging action of the stirring head, so that the effect of refining grains is achieved, the structure is more uniform, and the strength of the material is enhanced. The existing stirring head only has a single stirring friction function, and is used together with other equipment when a composite material is manufactured, so that the preparation cost of the material is high.

Disclosure of Invention

The invention aims to provide a stirring head structure of a friction stir processing device, which can automatically add a reinforcing phase.

In order to achieve the purpose, the friction stir processing device adopts the following technical scheme:

a novel hydraulic technology-based graphene-aluminum composite material preparation stirring head is characterized in that a main structure is a clamping handle, the clamping handle is of a cylindrical structure, a hydraulic hole is formed in the center of an axis of the clamping handle, an upper port of the hydraulic hole, namely the upper end of the corresponding clamping handle, is provided with an opening, an upper port of the hydraulic hole is provided with a hydraulic hole screw for sealing, and a lower port of the hydraulic hole is end-capped, namely the lower port of the hydraulic hole does not penetrate through the lower end face of the clamping handle; two sides of a hydraulic hole in the clamping handle are symmetrically provided with a material hole parallel to the hydraulic hole respectively, the material hole penetrates through the upper end and the lower end of the clamping handle, and the upper port of each material hole is provided with a material hole screw; a communicating channel is arranged between the hydraulic hole at the upper part of the clamping handle and each material hole to communicate the hydraulic hole with the material holes, and a sealing ball capable of sliding or rolling along the communicating channel is arranged in each communicating channel; the lower end surface of the clamping handle, namely the center of the shaft shoulder, is provided with a stirring needle.

The shaft shoulder is the lower end surface of the clamping handle, the diameter is 20-25mm, and materials are prevented from splashing;

the stirring pin is positioned right below the center of the shaft shoulder and is of a cone structure with a large upper end and a small lower end; the stirring needle is positioned between the two material holes;

the diameter of the sealing ball is equal to the inner diameter of the communication channel, and the sealing ball can only move in the communication channel.

The hydraulic holes are used for filling kerosene, and the material holes are used for filling mixed powder of graphene and aluminum powder; and the inside of the communicating channel is limited by a sealing ball, kerosene is filled in a part close to the hydraulic hole, and mixed powder of graphene and aluminum powder is filled in a part close to the material hole.

The hole diameter of the hydraulic hole is larger than that of the material hole;

further, the length of the working part of the stirring pin is smaller than the thickness of the plate to be processed.

Furthermore, the outer surface of the outer shaft shoulder is coated with a wear-resistant anti-sticking coating, so that the processing quality is ensured.

Further, the stirring pin is made of hard alloy; or the stirring pin comprises a steel substrate, and the outer surface of the steel substrate is coated with a titanium nitride coating.

Furthermore, the press-fitting acting surface between the stirring pin and the outer shaft shoulder is a plane.

The material hole top of both sides uses the screw to seal, is convenient for add graphite alkene and aluminium mixed powder, and the lower soldering tin of melting point is used to the bottom and is sealed, can drop automatically after stirring first temperature rise certain degree to make the mixed powder of inside graphite alkene and aluminium powder flow out.

Kerosene with higher thermal expansion coefficient is filled in the hydraulic hole, the bottom of the hydraulic hole is closed, and the top of the hydraulic hole is sealed by a screw; installing a sealing ball with the same diameter as the communicating channel in the channel, separating the kerosene from the graphene and the aluminum powder, wherein when the kerosene expands when heated in the hydraulic hole, the kerosene pushes the sealing ball in the communicating channel to roll or slide towards the material hole, further pushes the mixed powder of the graphene and the aluminum powder to advance along the communicating channel and the material hole in sequence, and finally the mixed powder of the graphene and the aluminum powder is discharged from the lower end of the material hole because the temperature reaches the melting point of the bottom soldering tin; when kerosene is cooled and shrunk, the graphene and aluminum powder mixed powder is added through the upper end of the material hole, and then the graphene and aluminum powder mixed powder pushes the sealing ball to move towards the hydraulic hole; and the process is repeated in the same way (the soldering tin can be automatically sealed in the same way).

The aluminum powder and graphene mixed powder is added into the material hole, has good fluidity, can be uniformly discharged after being expanded and extruded by kerosene in the hydraulic hole, and is fully mixed with an aluminum matrix.

The beneficial effects are that: the hard alloy or titanium nitride coating can greatly increase the wear resistance of the stirring pin, thereby prolonging the service life of the stirring pin.

The beneficial effects are that: the design is favorable for ensuring the processing quality of the friction stir processing.

The beneficial effects are that: according to the invention, the material adding part is combined with the stirring head body through a precise design, and energy generated in processing is reasonably utilized on the basis of the traditional stirring head for friction processing, so that the complexity of the processing technology is reduced, the processing efficiency is improved, and the production cost is also reduced.

Description of the figures (corresponding reference numerals 1-7 are given in the figures)

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.

FIG. 1 is a schematic structural view of a friction stir processing head of the present invention;

fig. 2 is a sectional view of a front view of the body of the stirring head.

FIG. 3 is a cross-sectional view of a top screw elevation of a cylindrical bore.

In the figure: 1-a screw; 2-a clamping handle; 3-sealing ball; 4-hydraulic holes; 5-material holes; 6-shaft shoulder; 7-stirring pin.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

Example 1:

as shown in fig. 1-3, this embodiment provides a novel stirring head, including stirring needle 7, shaft shoulder 6, centre gripping handle 2 and hydraulic system, the centre gripping handle is the cylinder type structure, stirring needle 7 is the toper structure, centre gripping handle and stirring needle coaxial coupling, and both diameters are different and produce shaft shoulder 6, hydraulic system contains hydraulic pressure part and material part, hydraulic pressure hole 4 upper end is sealed with screw 1 cooperation, seals through sealed ball 3 in the passageway with material hole 5 UNICOM, material hole 5 upper end uses screw 1 to seal, uses soldering tin to play the effect of temporary sealing at the during operation lower extreme. When different types of composite materials are processed, the type of the hydraulic oil can be adjusted by adding the concentration of the reinforcing phase, so that the powder adding speed can be controlled.

Novel automatic material stirring head that adds core lies in ingeniously utilizing produced heat in the friction stir processing to make the liquid expansion volume increase, promotes the mixed powder of graphite alkene and aluminium and slowly discharges, evenly distributed in the processing region, improves material strength, and novel stirring head structure is simple reasonable, has improved machining efficiency, can reduce the processing cost of processing.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.