Over the last decade, the enormous potential of metal additive manufacturing (AM) processes has led these technologies to establish their position in many industries. Much effort is being made toward their widespread application; however, much remains to be done to achieve full industrialization of these processes. Therefore, many companies, research centers and universities are investing in comprehensive research and development activities in order to further promote the industrialization of metal AM. This review traces the progress of metal AM technologies through an investigation of patents. In the present study, beam-based metal AM patents were searched through the Orbit Intelligence database. First, the number of patents per year was studied, indicating that, as expected, there is strong growth in AM patenting activities. The patents were afterward examined in order to highlight the key players in the field, and it was found that the main players investing in this market are: multidisciplinary companies, AM machine producers, end users working, especially in the aerospace sector, universities and research centers. The patents were then analyzed to understand the technology domains covered by each key player and their trend of investments. Finally, the patents in the field of Materials and Metallurgy were studied individually to identify the main topics faced by the most used alloy classes: Al-, Ni- and Ti-based alloys and steels. The extensive study of these patents clearly indicated that the main gaps to fill in metal AM are strongly material dependent and that it is possible to find correlations between the alloy classes, their main industrial applications and their specific AM processability issues. The current study provides insights into global trends that can help industrial markets to identify the right investment direction and research to identify topics for future investigation.

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Recent Progress in Beam-Based Metal Additive Manufacturing from a Materials Perspective: A Review of Patents

The invention discloses a preparation method of a graphene alloy nanocomposite and an SLM (Selective Laser Melting) forming process. According to the preparation method, turbid liquid is prepared through the ultrasonic vibration of anhydrous ethanol, so that the graphene is uniformly dispersed in the anhydrous ethanol, the graphene is uniformly dispersed, then after the graphene anhydrous ethanolturbid liquid is mixed with high-temperature alloy in proportion, the graphene and partial residue are distributed in the grain boundary and crystals by participating in the interfacial reaction, so that the strength and toughness of a formed part are improved, and the hot cracking tendency is reduced; the addition of graphene changes the organization form of the material; and in the SLM forming process, the graphene in the graphene high temperature alloy nanocomposite is used as a heterogeneous nucleating agent, and increases the nucleation rate in the solidification crystallization process.The graphene high temperature alloy nanocomposite is prepared by the dielectric barrier discharge plasma-assisted ball milling technique. The plasma enhances the activity of powder, so that columnar crystals preferentially growing change to isometric crystals, grains are refined and the performances are improved.

Preparation method of graphene alloy nanocomposite and SLM (Selective Laser Melting) forming process

The invention discloses a method for preparing a graphene reinforced aluminum alloy material based on a laser selective melting technology, and belongs to the technical field of preparation of composite materials. The method comprises the following steps: S1, adding graphene and a dispersing agent into deionized water, and carrying out ultrasonic oscillation to obtain graphene suspension liquid; S2, adding aluminum alloy powder into the graphene suspension liquid to obtain a graphene/aluminum alloy mixed solution, and carrying out ball milling and drying on the mixed solution to obtain graphene/aluminum alloy composite powder; and S3, applying the graphene/aluminum alloy composite powder to selective laser melting forming to obtain the graphene reinforced aluminum alloy material. According to the method disclosed by the invention, the wettability and the interface bonding strength between a matrix and reinforced particles are improved, a tightly combined ceramic/metal continuous interface is promoted to be formed, and the mechanical performance of the material is greatly improved.

Method for preparing graphene reinforced aluminum alloy material based on laser selective melting technology

The present invention provides a hydraulic straightening and cutting machine for an automobile accessory machining material. The hydraulic straightening and cutting machine for the automobile accessory machining material comprises a rail main body, a cutter and a black gold steel cutter. A cylindrical rod is screwed to the middle position of the top end surface of a support frame A. The cutter iswelded to the bottom end face of rectangular iron. The cutter is hardly abraded and has a high durability. When an iron sheet is cut, firstly, since the cutter is of a trapezoidal structure, the ironsheet can be cut through a shearing method instead of a conventional vertical integral cutting method, a hydraulic extension rod extends continuously to push the trapezoidal cutter to perform stepwisecutting, and thus the degree of abrasion to the cutter is reduced; and secondly, since the black gold steel cutter is welded to the lower right corner of the cutter, when the cutter is used to cut the iron sheet, the iron sheet is cut open by the black gold steel cutter and then is gradually cut by a cutter body instead of being directly cut by the cutter body, and thus a cutting edge of the cutter body is prevented from becoming curved.

Hydraulic straightening and cutting machine for automobile accessory machining material

The invention discloses a preparation method of a graphene-reinforced porous aluminum-based composite material. The preparation method comprises the steps that surface treatment is carried out on graphene with 2,6-diisocyanate methyl caproate, and modified graphene is obtained by reduction with hydrazine hydrate; and after the surface of the modified graphene is fully adsorbed with gas through anextra electric field, the modified graphene is mixed with aluminum alloy powder in a ball-milling mode in hexamethylphosphoramide, selective laser melting forming is carried out, and the graphene-reinforced porous aluminum-based composite material is prepared. According to the preparation method, the uniformity of dispersion of the graphene in an aluminum matrix is improved, the interfacial bonding performance of the graphene and the aluminum matrix is improved, and the porous metal composite material with a rich and uniform internal pore structure is prepared.

Preparation method of graphene-reinforced porous aluminum-based composite material

The invention belongs to the technical field of metal-based composite materials, and in particular relates to a selective laser melting formed graphene reinforced aluminum-based composite material anda preparation method thereof According to the method, compared with a conventional material removal processing technology, materials and energy sources are saved to the maximum extent through an additive manufacturing process A graphene/aluminum-based composite material is dispersed uniformly by way of ultrasonic dispersion+freeze drying+liquid nitrogen spherulitic graphite in the step, and graphene of a higher content is dispersed and added by increasing a freeze drying process and a liquid nitrogen quenching process in a dispersing process of dispersing graphene with ethanol in present stage researches Furthermore, the aluminum-based composite material is prepared through a selective laser melting forming technology, and a product is directly manufactured on a basis of shortening theworking hours and lowering the cost, so that the selective laser melting formed graphene reinforced aluminum-based composite material is suitable for the fields of aeronautical manufacturing, machining, medical, household consumption and the like

Selective laser melting formed graphene reinforced aluminum-based composite material and preparation method thereof

The utility model discloses a send belting for ultrasonic wave consolidation vibration material disk machine belongs to 3D and prints the vibration material disk field, the technical problem that willsolve provides a send belting for ultrasonic wave consolidation vibration material disk machine that can align, wash, cut to raw and other materials, the problem of this technique is solved the technical scheme who adopts does: a send belting for ultrasonic wave consolidation vibration material disk machine, includes base, frame, send and takes the roller, and including first leveling roller, second leveling roller, delivery track, cutting knife, the base top is provided with the frame, is provided with in the frame to send and takes roller, first leveling roller, second leveling roller, andrack end links to each other with the delivery track, and the upper and lower both sides of delivery track are provided with cleaning device and drying device, are provided with the cutting knife on the delivery track, the utility model discloses but wide application in vibration material disk field.

A send belting for ultrasonic wave consolidation vibration material disk machine

The invention belongs to the technical field of waste aluminum reusing, and particularly relates to a method and device for preparing powder for selective laser melting by recovering waste aluminum and a product. According to the method, the device and the product, waste aluminum recovering remelting technology and gas atomization powdering technology can be combined into a whole, the waste aluminum is directly prepared into the powder for laser selective melting, moreover, salt mixture components are added in the melting process so that the final powder can be uniform in microstructure, the crystal grains can be refined, and the product quality can be improved.

Method and device for preparing powder for selective laser melting by recovering waste aluminum and product

The invention provides a device and method for a 3D printing magnetic material, and belongs to the technical field of novel rapid forming. The device comprises a mechanical motion system, a powder conveying system and a magnetizing system which are controlled by a computer control center, wherein the mechanical motion system moves in the X direction through meshing of a gear and a rack, moves in the Y direction through rolling shaft lead screws and moves in the Z direction through a caterpillar. The powder conveying system conveys mixed magnetic powder through compressed air, and the magnetizing system is installed by stacking circular units and connected with electrodes to form a loop, wherein current flows spirally in the stacked circular units to generate a magnetic field, and printed parts are magnetized point by point. According to the device and method for the 3D printing magnetic material, the mixed magnetic powder and curing agent powder can be printed and formed, synchronous magnetization is achieved in the printing process, magnetic components of various complicated structures and with complicated distribution of magnetic induction lines can be produced, and the device and method for the 3D printing magnetic material can promote the rapid development of magnetic material industries.

Device and method for 3D printing magnetic material

The invention particularly relates to a preparation method of nickel/ graphene composite powder for rapid laser prototyping. The preparation method comprises the following steps 1, graphene is added into a dispersing agent for ultrasonic dispersion, and a graphene dispersion liquid is prepared; 2, a nickel source is dissolved in the graphene dispersion liquid obtained in the step 1 so as to obtaina solution A, imidazole organic ligand is dissolved in a solvent to obtain a solution B, the solution B is added into the solution A, and the mixture is filtered to the graphene loaded with nickel particles after leaving the mixture to stand for at least 16 hours; and 3, the graphene loaded with the nickel particles obtained in the step 2 is put into an aqueous solution, the nickel source, a reducing agent, a complexing agent and an adjusting agent are added after ultrasonic dispersion is carried out, the pH value is adjusted to 8-9 after uniformly mixing, reacting is carried out at 50-95 DEGC for at least 0.5 hour, the solid is washed after solid-liquid separation is carried out, the nickel/grapheme powder is obtained by drying, and the powder can be uniformly mixed with the nickel powder and is used for laser cladding and fusion molding of a laser selection area. According to the method, the preparation process is simple and controllable, an obtained product is excellent in performance, and the method is convenient for large-scale industrial application in the field of rapid laser prototyping.

Li Zhonghua

Papers

Selective laser melting formed graphene reinforced aluminum-based composite material and preparation method thereof

A send belting for ultrasonic wave consolidation vibration material disk machine

Method and device for preparing powder for selective laser melting by recovering waste aluminum and product

Device and method for 3D printing magnetic material

Preparation method of nickel/ graphene composite powder for rapid laser prototyping