307 results about "Powder bed" patented technology

A method for increasing the resolution when forming a three-dimensional article through successive fusion of parts of a powder bed, said method comprising providing a vacuum chamber, providing an electron gun, providing a first powder layer on a work table inside said vacuum chamber, directing an electron beam from said electron gun over said work table causing the powder layer to fuse in selected locations to form a first cross section of said three-dimensional article, providing a second powder layer on said work table, directing the electron beam over said work table causing said second powder layer to fuse in selected locations to form a second cross section of said three-dimensional article, reducing the pressure in the vacuum chamber from a first pressure level to a second pressure level between the providing of said first powder layer and said second powder layer.

The invention discloses equipment for manufacturing a large-size metal part in a high energy beam additive manufacturing mode and a control method of the equipment. The equipment comprises a work cavity, a worktable, a control system, a high energy beam scanning generator, a powder storage hopper, a powder laying device and a gas purification module, wherein the worktable is composed of a forming cylinder and a powder recycling cylinder, and the upper surface of the forming cylinder and the upper surface of the powder recycling cylinder are coplanar and form a work plane. The control system controls the high energy beam scanning generator and the powder laying device to move opposite to the worktable in the powder laying direction. The equipment for manufacturing the large-size metal part in the high energy beam additive manufacturing mode and the control method of the equipment largely shorten the waiting time caused by pre-installation of a powder bed when a common laser/electron beam selective melting technology is used for processing a part, thereby obviously improving the forming efficiency of high energy beam additive manufacturing. Through the application of the equipment for manufacturing the large-size metal part in the high energy beam additive manufacturing mode and the control method of the equipment, a metal part with a meter-grade size, high performance, high accuracy and a complex structure can be manufactured efficiently and rapidly.

The invention provides a preheating method and device suitable for powder laying type additive manufacturing, and belongs to the technical field of additive manufacturing. A movable type plane heating plate capable of covering a whole powder bed is arranged over the powder bed, the mounting height of the plane heating plate is slightly larger than a powder laying device, in the powder laying process, the powder bed and parts are preheated, after powder laying is finished, a plane light source is closed and put away, and the phenomenon that in the machining process, the plane heating plate blocks a high-energy beam is avoided. In the heating process, a temperature measuring sensor is used for monitoring the temperature of the powder bed in real time, a control system is adopted to implement feedback control over preheating of the powder bed according to the temperature monitoring result, full-breadth covering type heating is adopted, and the powder bed and formed parts are subject to high-temperature, efficient and unifier preheating. The invention further provides the device achieving the above method. The method is wide in application material and high in expansibility and is particularly suitable for powder laying type additive manufacturing of multiple large-breadth high-energy beams.

The invention refers to a method for selective laser melting additive manufacturing a three-dimensional metallic or ceramic article / component entirely or partly, comprising the steps of successively building up said article / component layer by layer directly from a powder bed of a metallic or ceramic base material by means of remelting the layers with a high energy laser beam, moving repetitively across the areas, which are to be solidified, wherein the movement of the laser beam is made of a superposition of a continuous linear movement and at least one superimposed oscillation with a determined frequency and amplitude and wherein the oscillation is created by a beam deflection device and the same beam deflection device is also used for linear positioning movement.

The invention relates to an arrangement for the production of a three-dimensional product, which arrangement comprises a work bench on which the said three-dimensional product is to be constructed, a powder dispenser which is arranged to apply a thin layer of powder onto the work bench to create a powder bed, an irradiation gun for transmitting energy to the powder so that melting of the powder takes place, the arrangement comprising a casing within which the pressure is reduced in relation to the atmospheric pressure and within which the work bench and the irradiation gun are located, with the powder dispenser, or a supply pipe connected to the powder dispenser, being arranged partially outside the casing.

A powder bed fusion apparatus in which an object is built in a layer-by-layer manner. The apparatus includes a build sleeve, a build platform for supporting a powder bed and the build platform lowerable in the build sleeve. A heating element is integrated in or located on the build platform or the build sleeve. A seal is provided for sealing a gap between the build platform and the build sleeve to prevent powder from passing through the gap. A build chamber is provided for maintaining an inert atmosphere both above and below the build platform.

A method of performing powder bed fusion process is provided. A powder bed and a group of information of the powder bed are obtained. A powder bed simulation is performed to obtain a thickness of the powder bed and a packing density. Then, a group of parameters of a laser is obtained. A Ray Tracing simulation for the powder layer and a heat transfer simulation are performed. A first surrogate model is constructed to obtain first processing maps. The points in the first processing maps with the depths of the melt pool that are greater than a predetermined depth value and smaller than a laser beam radius are a first group of parameter values. A parameter setting operation is performed by using the first group of parameter values. A laser melting operation is performed, and a temperature distribution is measured by using an infrared thermal camera.

The invention belongs to the technical field of additive manufacturing, and relates to a powder bed synchronous heating and melting additive manufacturing method which is used for realizing material additive manufacturing under the conditions of a vacuum environment and a high powder bed temperature. According to the method, synchronous electron beam heating is carried out on a non-part section area while selective melting deposition is carried out to form a part section, the powder bed temperature at the non-part section area is kept, large fluctuation of the powder bed temperature is avoided, and it is guaranteed that the staying time of electron beams in unit areas of different positions of a powder bed is equal, so that the energy densities of the electron beams received at the different positions of a preheating area are equal, the temperatures at different positions of the preheating area are uniform, the stability and consistency of the key technological parameter of the powderbed temperature in a powder bed melting technology are enhanced, the thermal stress of the formed part is reduced, the consistency of the performance of the formed part is improved, and conditions arecreated for additive manufacturing of refractory, difficult-to-weld and brittle materials.

The invention relates to a large laser selection melting forming dust removal scanning device and method. The device includes a plurality of blowing and suction air port units with the same structure,a scraper, a powder bed surface and dynamic focusing vibration mirror groups for the division and scanning of forming areas. The dynamic focusing vibration mirror groups are evenly distributed in multiple columns in the direction of the scraper movement, and the blowing and suction air port units are arranged under each column of the dynamic focusing vibration mirror groups. The blowing and suction air port units include air blowing ports and air suction ports, and the air blowing ports and the air suction ports are connected with an external dust removal filtration system; and air port movement brackets for the support of the blowing and suction air port units, vertical movement guide rails for the vertical movement of the air port movement brackets and horizontal movement guide rails for the horizontal movement of the air port movement brackets are further included, and the blowing and suction air port units are evenly distributed on the air port movement brackets in the direction of the scraper movement. The large laser selection melting forming dust removal scanning device and method can guarantee the forming quality and process consistency of parts, the equipment can run steadily for a long time, and at the same time, the forming efficiency of the equipment is improved.

The invention provides a method for predicting interlayer thermal stress distribution in the selective laser melting process based on COMSOL. The method comprises the following steps: S1, constructing a three-dimensional solid heat transfer and structural mechanics transient model based on COMSOL; s2, determining parameters in a simulation process; s3, determining the material attribute of the powder to be melted; s4, determining moving Gaussian heat source parameters; s5, constructing a geometric model of the powder bed; s6, achieving layer-by-layer manufacturing of selective laser melting; s7, carrying out grid division and calculating node temperature; and S8, predicting interlayer thermal stress distribution and residual thermal stress distribution according to a result of the step S7. According to the method, the laser heat source effect in the machining process is simulated through a moving Gaussian heat source mold, and a powder bed is replaced with a uniform material powder bed; in addition, the structural mechanics module is used for simulating the thermal stress generated by the layer and the deformation condition of a workpiece when the structural mechanics module moves along with a heat source, the layer-by-layer manufacturing process of the selective laser melting technology is simulated, and prediction of thermal stress among multiple layers and residual thermal stress is achieved.

A powder bed fusion apparatus for building an object in a layer-by-layer manner includes a build platform movable within a build sleeve to define a build volume, a layer formation device for forming layers of powder across the build volume in a working plane and an irradiation device for irradiating powder in the working plane to selectively fuse the powder. The powder bed fusion apparatus further includes a mechanical manipulator arranged to engage with the object and/or a build substrate, to which the object is attached, to tilt the object in a raised position above the working plane such that powder is freed from the object and deposited at a location above the working plane and/or into the build volume.

The invention discloses an in situ real-time measurement device used in a powder bed melting additive manufacturing process. A thermocouple of the device is arranged at a position, where temperature needs to be measured, on a substrate, and a displacement sensor is in contact with the lower surface of the substrate, so that the displacement sensor can measure deformation of the substrate in the additive manufacturing process. The device disclosed by the invention can realize in situ real-time monitoring on thermal-deformation (or temperature) of the substrate and a formed part in the powder bed melting additive manufacturing process, can accurately reflect evolution rules of the thermal-deformation (or temperature) of the substrate along with time, not only provides a reliable experimentalmeasurement basis for studying a deformation mechanism of the substrate and the formed part in the powder bed melting additive manufacturing process, but also provides powerful experimental data forfinite element simulation on powder bed melting additive manufacturing and finally lays a foundation for establishing a technique of effectively controlling deformation of the substrate and the formedpart as well as obtaining a high-precision and high-performance formed part.

A process for producing a solid pharmaceutical dosage formulation, said process comprising powder bed fusion selective laser 3-dimensional printing of a mixture comprising: (a)a drug; and (b)an excipient; whereinat least one of said drug and said excipient absorbs electromagnetic radiation at a wavelength emitted by the laser; or (a)a drug; (b)an excipient; and (c)an absorbent material which absorbs electromagnetic radiation at a wavelength emitted by the laser.

The invention discloses an additive-manufactured porous tantalum metal acetabular outer cup and a preparation method thereof. 50% or above of the volume of the porous tantalum acetabular outer cup adopts a porous structure, the average pore size is 200-2000 [mu]m, the average wire diameter is 300-1000 [mu]m, the porosity is 50-95%, the pore connectivity is larger than 80%, the porous structure penetrates through a whole semispherical shell cup, the thickness is larger than 3 mm, and one or more screw holes are formed in the porous structure; the porous tantalum metal acetabular outer cup is integrally prepared by additive manufacturing technologies such as powder bed laser melting or electron beam melting with pure tantalum metal or tantalum alloy powder as a raw material, and the particlesize of raw material powder is 10-150 [mu]m; the rim of the porous tantalum acetabular outer cup is of a compact structure, the thickness is larger than 1 mm, and three or more clamping grooves are uniformly distributed in the inner side of the compact structure. The tantalum metal acetabular outer cup has the technical advantages as follows: the porous structure of the tantalum metal cup has mechanical properties close to those of human bone and facilitates rapid bone growth to form biological fixation and improve implantation stability.

The invention relates to a method and a device for protecting a print head (100) during layer-by-layer manufacture of a shaped part (103) using the binder jetting process, in which a plurality of elements required for preserving print head function act, and are housed, in a space which is partially sealed off by a gap seal (800).

The present disclosure generally relates to methods for additive manufacturing (AM) that utilize spoke support structures in the process of building objects, as well as novel spoke support structures to be used within these AM processes. The object includes a first portion and a second portion. A first distal end of the first portion is separated from a second distal end of the second portion by a portion of unfused powder. At least one support structure connects the first distal end to the second distal end. The method includes removing the object and the support structure from the powder bed. The method includes heat treating the object and the support structure. The support structure maintains dimensional stability of the object during the heat treatment. The method includes machining away the support structure from the first distal end and the second distal end after the heat treatment.