1050 results about "Selective laser sintering" patented technology

An additive manufacturing process (110) wherein a powder (116) including a superalloy material and flux is selectively melted in layers with a laser beam (124) to form a superalloy component (126). The flux performs a cleaning function to react with contaminants to float them to the surface of the melt to form a slag. The flux also provides a shielding function, thereby eliminating the need for an inert cover gas. The powder may be a mixture of alloy and flux particles, or it may be formed of composite alloy/flux particles.

The present invention relates to a sinter powder composed of polyamide which also comprises metal salts of weak acids, in particular metal carbonates, and fatty acid derivatives, in particular fatty acid esters or fatty acid amides, to a process for laser sintering, and also to moldings produced from this sinter powder. The moldings formed using the powder of the invention have marked advantages in appearance and in surface finish when compared with conventional products, especially when recyclability in the selective laser sintering (SLS) process is taken into account. Moldings produced from recycled sinter powder of the invention moreover also have markedly improved mechanical properties when compared with moldings based on recycled conventional nylon-12 powders, in particular in terms of modulus of elasticity and tensile strain at break. These moldings also have a density approaching that of injection moldings.

A method for determining a bed temperature setpoint for use with a powder in a selective laser sintering machine is disclosed. The method includes the step of providing a powder comprising a polymer for use in a selective laser sintering machine. The method further includes the step of determining a ratio of a liquid portion of the powder to a solid portion of the powder as a function of temperature within a temperature range. A bed temperature setpoint is selected in the temperature range corresponding to a desired ratio of the liquid portion of the powder to the solid portion of the powder. A temperature of a bed of a selective laser sintering machine is set to the selected bed temperature setpoint, and a part is built from the powder using the selective laser sintering machine.

A process for producing an artificial bone model in accordance with the selective laser sintering process which comprises extending a powder material for sintering comprising 30 to 90 parts by weight of powder of a synthetic resin and 10 to 70% by weight of an inorganic filler to form a thin layer and irradiating a portion of the thin layer having the shape formed based on tomograpic information of a natural bone with laser light so that the irradiated portion of the thin layer is sintered. The extension of the powder material for sintering to form the thin layer and the irradiation of the thin layer with laser light for sintering are conducted repeatedly. The artificial bone model can three-dimensionally reproduce steric shapes of natural bones such as bones in the human body precisely and accurately and exhibits the property for cutting closely similar to that of natural bones. The artificial bone model can be used for educational training or for studying a plan for curing before a surgical operation.

A three-dimensional object is manufactured by selective sintering by means of electromagnetic radiation, wherein the powder comprises a polymer or copolymer having at least one of the following structural characteristics:

• • (i) at least one branching group in the backbone chain of the polymer or copolymer, provided that in case of the use of polyaryletherketones (PAEK) the branching group is an aromatic structural unit in the backbone chain of the polymer or copolymer;
  • (ii) modification of at least one end group of the backbone chain of the polymer or copolymer;
  • (iii) at least one bulky group within the backbone chain of the polymer of copolymer, provided that in case of the use of polyaryletherketones (PAEK) the bulky group is not selected from the group consisting of phenylene, biphenylene, naphthalene and CH₂— or isopropylidene-linked aromatics;
  • (iv) at least one aromatic group non-linearly linking the backbone chain.

The invention discloses a polyurethane composite material for 3D printing, and a preparation method and application thereof. The invention is characterized in that the polyurethane composite material is prepared from the following initial raw materials in parts by weight: 100 parts of polyurethane, 0.1-10 parts of inorganic filler, 0.1-0.5 part of light stabilizer and 0.1-0.5 part of antioxidant. The preparation method comprises the following steps: evenly mixing 100 parts of polyurethane, 0.1-10 parts of inorganic filler, 0.1-0.5 part of light stabilizer and 0.1-0.5 part of antioxidant, and preparing power to obtain the composite material, wherein the average particle size of the composite material powder is 10-100 mu m. The product can be prepared by a 3D printing technique, such as selective laser sintering. The polyurethane has favorable flexibility; and the introduced inorganic filler improves the 3D printing performance of the polyurethane, so that the product has excellent mechanical properties. The tensile strength of the product prepared from the material by laser sintering can reach 20.12 MPa, and the elongation at break can reach 511.12%.

A technology for manufacturing a part by proximal forming method includes such steps as inputting the 3D model of a part to a fast SLM or SLS machine, vacuumizing the shaping chamber of SLM or SLS machine, using laser to scan the metal powder outside the boundary for smelting it, scan the metal powder inside the boundary to form mesh structure, forming a compact shell sealed part, and HIP processing.

The invention provides a method for preparing nylon powder for selective laser sintering. The method is used for preparing nylon powder materials by steps of heat treatment, powder preparation in a solvent method, addition of an appropriate addition agent and the like, wherein the nylon powder materials have excellent performances and can be effectively applied to a selective laser sintering (SLS for short) process for preparing SLS pieces. The method has simple and convenient process, is environmental friendly and is easy to implement.

The invention relates to a negative pressure-based device and a negative pressure-based method for manufacturing porous textures by laser sintering and quick molding. The device comprises an X-Y workbench, wherein a pair of guide rails is arranged on the workbench, and the guide rails have a powder spreading roller and a power spreading groove which can move reciprocally along the guide rails; the X-Y workbench is provided with a molding tank, and a molding workbench capable of moving vertically is arranged in the molding tank; the molding workbench consists of a screen with holes distributed densely and a carriage, and a negative pressure chamber is formed on the lower surface of the molding workbench; the bottom end of the negative pressure chamber is connected with a screw and a servo motor in turn; an absorption tube is communicated with the negative pressure chamber through an opening; and the other end of the absorption tube is connected with a filter and a vacuum pump in turn. In the invention, based on a negative pressure absorption principle, powder which is not sintered on each layer is removed and recycled through an absorption tube; and through layer-by-layer absorption, the powder which is not sintered and solidified is cleaned completely, while the sintered and solidified powder is continuously stacked and overlaid to form parts, so that the manufacturing of the porous texture with an aperture of less than 1mm is realized through selective laser sintering and quick molding.

The present invention relates to a sinter powder composed of polyamide which also comprises PMMI, PMMA, or copolymers with PMMI, in particular PMMI-PMMA copolymers, to the use of this sinter powder for laser-sintering, and also to moldings produced from this sinter powder. The moldings made from the powder of the invention have marked advantages over conventional products in their appearance and in their surface quality, especially as far as roughness and dimensional stability during selective laser sintering (SLS) are concerned. In addition, moldings produced from the sinter powder of the invention also have better mechanical properties than moldings based on conventional nylon-12 powders, in particular in terms of modulus of elasticity and tensile strength. These moldings also have a density close to that of injection moldings.

The present invention discloses a manufacture method of a tissue frame, which conducts the selective laser sintering by the polymer micro spheres. The method comprises the following steps. The polymer material dissolved in the solvent is dropped in the dispersant under stirring status at a uniform speed. The polymer micro spheres are obtained after cleaning, ultrasound dispersion and freezing preparation. The mixing powder is obtained after mixing the polymer micro spheres with a pore-foaming agent. A three-dimensional model of the frame is designed by the computer assistant software. The mixing powder is formed by the selective laser sintering according to the three-dimensional model; therefore the frame is produced. The polymer micro spheres produced by the method in the present invention have regular shapes and adjustable particle diameter. The method is simple and practical. The mechanical property of the frame after forming is excellent. The horizontal movement between the layers is small and the forming accuracy is high.

The invention relates to a carbon fiber reinforced resin powder material for selective laser sintering (SLS). The powder material comprises 48-88 parts by mass of resin powder, 10-50 parts by mass of carbon fibers, 0.5-1.2 parts by mass of antioxidants, 0.2-1 part by mass of flow promoting agent and 0.2-0.6 parts by mass of dispersant per 100 parts by mass of the reinforced material. The carbon fiber reinforced resin powder material for selective laser sintering is obtained by configuring the each component sequentially according to a certain process. The strength and modulus of SLS molded parts made of the resin powder material disclosed by the invention, compared with SLS molded parts made of the matrix resin material, are greatly enhanced and the requirements on the mechanical performance of the molded parts directly as end products can be met better.

A method of assembling a first part and a second part. The method may comprise the step of integrally forming an attachment device and a first part. For example, the attachment device may be a nut plate operative to retain a nut therein, and the first part may be an air duct. The nut plate and the air duct may be integrally formed via selective laser sintering or stereo lithography such that the nut plate is an integral feature of the air duct. A nut may be retained in the nut plate, and a mating bolt may engage the nut to attach the air duct (i.e., the first part) to the second part.

The invention provides a preparation method of polyamide powder used for selective laser sintering. By employing a precipitation method to, the method comprises the operations of dissolution, cooling, and precipitation so as to obtain solid powder. The method is characterized in that it is carried out in the presence of a heterogeneous nucleating agent, and the cooling process falls into two stages, with the first stage cooled to a temperature higher than a precipitation temperature by 5-25DEG C and the second stage cooled to the precipitation temperature again, and after isothermal precipitation, the heat is preserved for some time. Being simple and feasible, the method provided in the invention can prepare polyamide powder which has uniform particle size distribution and a good flowing property and is suitable for selective laser sintering (SLS).

Additive manufacturing may be used to manufacture components of downhole tools conveyed by downhole wireline, tubing, drill pipe and/or the like. A method in accordance with one or more aspects of the disclosure uses starting materials to incorporate one or more feedthroughs, passages, channels, chambers and the like in a downhole tool structure during the formation of the structure. A CAD may be made and then converted to a STL file, and then stereo lithography, selective laser sintering, fused deposition modeling, direct metal laser sintering and/or electron beam melting may be used to form the downhole tool. Subtractive manufacturing may be performed on the downhole tool after the downhole tool is formed by additive manufacturing.

The invention relates to a method for producing a component through selective laser melting and to a process chamber (11) for carrying out the method. According to the invention, the selective laser melting by way of a laser (17) is also used for producing coating areas (25) of the component (14) being produced, said coating areas having a composition that differs from the composition of the powder. This is accomplished by intermittently introducing a reactive gas (27) that reacts with the powder material or that produces a material on the component (14) from precursors present in the reactive gas. In the process chamber according to the invention, an additional feed line (28a, 28b) is provided for introducing reactive gas, said feed line permitting the feeding of the reactive gas if possible close to the laser (17).

The invention discloses a high-entropy alloy hot-end part manufacturing method of a turbine engine on the basis of selective laser melting and belongs to the technical field of manufacture of hot-end parts of the turbine engine. The high-entropy alloy hot-end part manufacturing method includes firstly selecting five or more of eight kinds of high-melting metal powder of tungsten, titanium, zirconium, hafnium, vanadium, niobium, tantalum and molybdenum, and mixing the powder uniformly according to a certain mole ratio to obtain high-entropy alloy powder; setting up a three-dimensional solid model of a hot-end part of the turbine engine, slicing and layering by software to obtain profile data of various sections, and importing the data into a quick forming device; quickly forming a hot-end part blank of the turbine engine by the SLM technology; thermally treating and finely processing the blank to obtain the high-temperature high-entropy alloy hot-end part of the turbine engine. The formed hot-end part of the turbine engine has high compactness and excellent high temperature performance, has high forming accuracy and surface accuracy and can be quickly and accurately manufactured.

A method for making golf club heads includes using direct metal laser sintering (DMLS), selective laser melting (SLM) and other computer controlled high energy sintering or melting techniques to form club heads with customized user parameters. The powdered metals can be selected by type and quantity to achieve a desired density or weight distribution. Club heads made by these techniques are characterized by having customized parameters chosen for individual golfers. By sintering powdered metal to form areas of different porosity, club heads with desired weight distributions can be achieved.

The invention provides a method for manufacturing a pure titanium porous structure through selective laser melting. The method for manufacturing the pure titanium porous structure through selective laser melting comprises the following steps that firstly, a three-dimensional model of the porous structure to be manufactured is built in a computer; secondly, hierarchical preprocessing is conducted on the built three-dimensional model; thirdly, 3D printing parameters are set, hierarchical processing is conducted on the three-dimensional mode, and a file of a corresponding format is saved and exported; fourthly, the exported file is imported into 3D printing equipment, and 3D printing is conducted. According to the method for manufacturing the pure titanium porous structure through selective laser melting, metal parts with various macro-structure porous structures can be manufactured according to actual requirements, one-time forming is realized, the shortcomings of unstable mechanical properties and a simplex shape caused by a traditional processing method are overcome, and processing efficiency and economic benefit are improved.

The invention discloses a powder material for selective laser sintering and a preparation method thereof. The powder material is composed of, by weight, 10-90 parts of resin matrix, 5-90 parts of filler, 0.1-5 parts of coupling agent, 0.1-5 parts of dispersant, 0.1-5 parts of compatibilizer, 0.1-8 parts of flow promoting agent, 0.01-3 parts of antioxidant, 0.05-2 parts of light absorbing agent, 0.01-2 parts of lubricant and 0.05-4 parts of surfactant. The preparation method includes: treating the surface of the filler; blending raw materials; banburying the raw materials; powdering; spherifying powder; performing surface modification on the powder. Compared with the prior art, the powder material and the preparation method have the advantages that the preparation method is simple and supportive of continuous production; the preparation process is energy-saving, environment-friendly and pollution-free; resin in the powder material prepared by the method uniformly coats the surface of the filler, and the powder is high in sphericity and excellent in sintering performance.