203 results about "Powder bed" patented technology

The invention belongs to the technical field of cable processing, and relates to a preparation method and application of a flexible superconducting coaxial cable outer conductor. The preparation method comprises the following steps: mixing Nb powder and Ti powder by adopting a vibrating ball mill to prepare NbTi composite powder; a substrate of laser powder bed melting equipment is preheated, the NbTi composite powder is spread on the substrate of the laser powder bed melting equipment, a melting powder layer is scanned through the laser powder bed melting technology, a three-dimensional communicated grid structure is formed through interlayer staggered scanning, finally, the NbTi net-shaped alloy pipe is placed in a strong acid solution to be soaked for a short time, redundant metal powder is removed, and the NbTi net-shaped alloy pipe is obtained. And finally, the preparation of the flexible superconducting coaxial cable outer conductor for the quantum computer is realized.

A method of three-dimensional printing can include iteratively applying a polymer build material as individual layers to a powder bed, where the polymer build material includes from about 80 wt % to 100 wt % polymeric particles, and based on a three-dimensional object model, selectively applying a coalescing agent onto individual layers of the polymer build material. The coalescing agent can include an aqueous liquid vehicle and a coalescing solvent that depresses a melting point of the polymeric particles. The method can include exposing the powder bed to heat to selectively coalesce portions of individual layers of the polymer build material in contact with the coalescing solvent. The heat may not be sufficient to coalesce the polymer build material that is not in contact with the coalescing solvent and may be sufficient to fuse the polymeric particles in contact with the coalescing solvent together to form a three-dimensional object.

The invention discloses a laser powder bed molten high-strength, high-plasticity and high-work-hardening titanium alloy and a preparation method and application thereof.The preparation method comprises the steps that two kinds of titanium alloy powder with different Mo equivalents are mixed according to a certain mass ratio to form mixed powder, and the mixed powder is put into laser powder bed melting equipment; the titanium alloy is finally obtained through layer-by-layer forming by laser powder bed melting equipment according to a slicing path and process parameters of a three-dimensional model, the microstructure of the prepared titanium alloy comprises hexagonal martensite alpha 'and orthorhombic martensite alpha', and in a preferable scheme, under the condition that heat treatment is not needed, the yield strength of the titanium alloy is larger than or equal to 950 MPa, the tensile strength is larger than or equal to 1250 MPa, and the tensile strength is larger than or equal to 1250 MPa. The alloy has the advantages of high strength, high plasticity and excellent work hardening capacity, can meet the requirements of forming and high mechanical properties of titanium alloy components in complex shapes, and is especially suitable for the fields of aerospace, automobiles, weapon armors, ships, oceans and the like, and the ductility is greater than or equal to 14%, and the work hardening capacity is greater than or equal to 250 MPa.

The invention discloses an electron beam additive manufacturing method for an integrated copper-chromium contact-conducting rod assembly, and belongs to the technical field of copper-chromium contact manufacturing. The electron beam additive manufacturing method comprises the steps that S1, a special powder system is designed and prepared, specifically, contact area powder and conducting rod area powder are prepared and subjected to drying treatment; s2, digital modeling and support design: establishing an integrated copper-chromium contact-conducting rod assembly model by using three-dimensional software and slicing; S3, fusing and integrally forming by using an electron beam powder bed: printing an integrated copper-chromium contact-conducting rod assembly in a vacuum chamber of the electron beam powder bed, and S4, a printing post-treatment process is carried out, specifically, returning treatment, hot isostatic pressing treatment and machining treatment are carried out on the integrated copper-chromium contact-conducting rod assembly printed piece. According to the printing post-treatment process, the residual stress of the integrated copper-chromium contact-conducting rod assembly can be effectively eliminated through the printing post-treatment process; and the problems of macroscopic cracks and part warping caused by high residual thermal stress can be effectively avoided.

The invention belongs to the technical field of 3D printing, and particularly relates to a continuous pulse mixed type patterning laser powder bed light path system and method.Laser powder is preheated to be close to a melting point but not molten through set continuous-period light emitting, the preheated laser powder is completely molten through pulse-period light emitting, and in other words, the continuous pulse mixed type patterning laser powder bed light path system and method are obtained; continuous light is only used for preheating powder for a short time, so that the powder is close to a melting point but not molten; then peak energy is rapidly provided through microsecond pulsed light, powder melting is completed instantly, in this way, the effective heating time is shortened, the heat radiation range of heating is controlled, the heating time of a system is far shorter than the heating time of traditional continuous light, melting and solidification are completed when heat is not diffused out of a preset pattern in time, and the production efficiency is greatly improved. Therefore, the fusion area is limited within the pattern range, the subsequent part forming precision is improved, and laser loss caused by too high peak power due to short time is reduced through pulse light emitting and continuous light emitting.

The utility model discloses a powder spreading mechanism based on a 3D printer and a 3D printing device, and the powder spreading mechanism comprises a translation cross beam frame capable of performing translation motion; the powder spreading roller body is arranged on the translation cross beam frame in a switching assembly manner; and two end parts of the driving rope body are positioned, and the driving rope body is assembled on the powder spreading roller body in a winding manner. According to the mechanism and the device, the powder spreading roller body can be effectively driven to translate corresponding to the powder spreading bed through the translating cross beam frame, and meanwhile, smooth low-vibration powder spreading can be effectively realized by utilizing the roller body transmission part based on the driving rope body under the friction driving action of the rope wheel, so that the stability of the flattening function of the powder bed is remarkably enhanced, and the functional practicability is improved.

The present invention relates to a method for powder-bed fusion additive manufacturing of a radiofrequency device, comprising a depowdering step, during which the powder residue is discharged through a through-hole (10, 20) made in the manufacturing support (S) and / or in a wall of the radiofrequency device (1) adjacent to the manufacturing support (S) without the manufactured radiofrequency device (1) having to be separated from the manufacturing support (S) during the step of discharging the powder residue. The invention also relates to a manufacturing support comprising at least one through-hole (10) allowing a powder residue to be discharged during a depowdering step. (Fig. 2)

The invention belongs to the technical field of additive manufacturing, and particularly relates to a powder bed sintering method for PAEKs and a composite material thereof, which is particularly suitable for inhibiting buckling deformation caused by crystallization shrinkage in a low-temperature sintering process of PEEK, PEKK and a composite material thereof. Comprising the following steps that the size of a base is designed for a to-be-sintered sample piece, the x-y size of the base is larger than the projected area of the sample piece, and the thickness is smaller than 1 mm; the base is divided into n layers according to the thickness, and n is larger than or equal to 3 and smaller than or equal to 6; pAEKs and a composite material thereof are subjected to powder spreading and preheating in powder bed sintering equipment, and preparation work before sintering is completed; sintering the base structure layer by layer to form a constraint base with certain elasticity; the sample piece is sintered on the base, shrinkage deformation of the material is restrained through mechanical constraint of the base on the sample piece, and the sample piece sintering operation is completed.

Methods of three-dimensional printing can include iteratively applying a polymer build material as individual layers to a powder bed, where the polymer build material includes from about 80 wt % to 100 wt % polymer build particles, and based on a three-dimensional object model, selectively applying a binder agent including an aqueous liquid vehicle and polymer binder particles onto the individual layers of the polymer build material. The polymer binder particles have or are capable of having a melting temperature lower than a melting temperature of the polymer build particles. The methods can include exposing the powder bed to heat at a temperature less than a melting point of the polymer build particles but greater than a melting temperature of the polymer binder particles. The heat causes the polymer binder particles to melt to adhere the polymer build particles together to form a three-dimensional object.

The invention discloses a laser powder bed sheet pattern distortion real-time correction system and method based on a phase type light valve, and relates to the technical field of metal additive manufacturing. The system comprises a polarization laser, a beam expanding and collimating unit, a reflecting mirror, a phase-type spatial light modulator, a reflecting mirror, a relay optical system, a galvanometer / field lens system, a movable spectroscope, a reference plane mirror and a forming cylinder. A double-loop correction system with a position sensitive detector as an absolute reference and a wavefront sensor as direct feedback is constructed, information of the position sensitive detector and the wavefront sensor is unified in a phase domain through a frequency domain fusion algorithm, and a comprehensive compensation phase diagram capable of completing pattern generation and distortion correction at the same time is generated. And loading to a phase type light valve to carry out high-power laser patterning modulation, and melting metal powder of a powder bed.

A method of determining instructions to be executed by a powder bed fusion apparatus, in which an object is built in a layer-by-layer manner by selectively irradiating each of a plurality of successively formed powder layers with an energy beam. The method comprises determining, for at least one of the powder layers, a scan path for the energy beam to scan to melt powder of the powder layer, the scan path including bulk irradiation locations, wherein, for each bulk irradiation location, powder is melted by the energy beam to form, together with powder melted by irradiation of previous powder layers, a thickness of consolidated material from the bulk irradiation location to a surface of the object above a bulk threshold, and non- bulk irradiation locations, wherein, for each non-bulk irradiation location, powder is melted to form a thickness of consolidated material from the non-bulk irradiation location to a surface of the object less than the bulk threshold. The method comprises allocating a bulk value for an exposure parameter to the bulk irradiation locations, and determining a non-bulk value for the exposure parameter for each non-bulk irradiation location dependent on, at least in part, the thickness of the consolidated material from the non-bulk irradiation location.

This disclosure is directed to a method for modeling additive manufacturing of a part, including a number of steps. The steps include constructing a model for estimating output of a simulated additive manufacturing process, followed by entering process operating parameters for an additive manufacturing system into the model to produce an output. The output is compared to acceptance criteria to determine whether the output is acceptable or unacceptable. Next regions of operating parameters that support production of the part with acceptable quality characteristics are determined based upon the output. Regions of operating parameters that support production of the part with acceptable quality characteristics are added to a process map for additive manufacturing the part. The steps are repeated for different operating parameters until the process map is complete.

This invention provides a three-dimensional molding apparatus and method that improve molding accuracy in three-dimensional molding, which involves repeatedly melting and solidifying powder and then cutting it to form a three-dimensional object. [Solution] In a powder bed type three-dimensional molding apparatus, a laser is irradiated onto metal powder to melt and solidify the powder, forming thin layers, and these thin layers are stacked to create a three-dimensional object. At this time, the molding accuracy of the object is improved by cutting off the formed layers after each predetermined layer has been formed, such as 10 layers. The cutting data that defines the cutting shape uses a shape S3 obtained by reflecting the displacement d1 between the desired shape S1 and the shape S2 whose deformation has been predicted by simulation onto shape S1. Alternatively, the deformation of shape S3 may be further predicted to obtain a displacement d2 between it and shape S1, and a shape S5 that reflects this displacement may be used as the cutting data.

A scanning path planning method for a metal laser powder bed fusion forming process comprises the steps that 1, a TPMS lattice model is built through an implicit function equation, slicing is conducted through an implicit slicing method, and a two-dimensional contour is obtained; 2, generating a multi-stage initial contour line path through contour surface constants of the uniform change implicit function equation; 3, calculating the distance between the adjacent initial isoline paths, and identifying an area with the distance exceeding a preset tolerance as an unqualified area and the rest as a qualified area; 4, retaining an initial isoline path in the qualified area, and generating a grid filling path in the unqualified area to obtain a mixed path set; 5, inputting a mixed path set, and on the premise of not changing geometric coordinates of each path section, carrying out connection sequence optimization on all the path sections to form a continuous scanning track; and 6, converting the formed continuous scanning track into a file format which can be executed by laser powder bed melting equipment. According to the method, the powder adhesion and deformation risks are remarkably reduced, and the SLM forming precision and efficiency are improved.

The present disclosure provides systems and methods for the formation of three-dimensional objects. A method for forming a three-dimensional object may comprise alternately and sequentially applying a stream comprising a binding substance to an area of a layer of powder material in a powder bed, and generating at least one perimeter of the three-dimensional object in the area. The stream may be applied in accordance with a model design of the three-dimensional object. The at least one perimeter may generated in accordance with the model design.

The invention discloses high-strength iron-based die steel powder for laser powder bed melting additive manufacturing and a production method of the high-strength iron-based die steel powder. The high-strength iron-based die steel powder has the characteristics of being high in process controllability, excellent in powder performance, wide in application prospect and the like. The method can be widely applied to manufacturing of high-performance molds in the fields of automobiles, aerospace, electronic packaging and the like, and has good industrial popularization value.

A print engine of an additive manufacturing system includes a printing station having a printing bed, a powder dispenser, and first and second powder holding chambers. The first powder nozzle and the second powder nozzle are connected to the first powder holding chamber and the second powder holding chamber, respectively. At least one vibrating element is attached to the printing bed, the powder spreader, the first powder holding chamber and the second powder holding chamber, and at least one of the first powder nozzle and the second powder nozzle. In one embodiment, a laser capable of directing a two-dimensional laser image against a printing bed is provided. In another embodiment, the sizes of the powders held in the respective first and second powder holding chambers are different.

The invention discloses a laser powder bed molten high-plasticity TC4 titanium alloy and a preparation method and application thereof. A laser powder bed melting forming process is combined with a heat treatment process, a specific process parameter window is defined, the printing state density of the TC4 titanium alloy is larger than or equal to 99.6%, the phase composition of the high-plasticity TC4 titanium alloy obtained after heat treatment is alpha + beta double phases, alpha-phase grains are approximately equiaxed or equiaxed, the average size of the alpha-phase grains is smaller than or equal to 6.0 micrometers, the average length-diameter ratio of the alpha-phase grains is smaller than or equal to 3.0, and the thickness of the high-plasticity TC4 titanium alloy is smaller than or equal to 10 micrometers. The maximum texture strength of an alpha-phase pole figure of the high-plasticity TC4 titanium alloy is smaller than or equal to 8.0, and the maximum texture strength of an alpha-phase opposite pole figure of the high-plasticity TC4 titanium alloy is smaller than or equal to 3.0. The TC4 titanium alloy with a new microstructure is prepared, the cooperation of high density, nearly equiaxed or equiaxed tissues and low textures is realized, excellent plasticity and strong plasticity combination is obtained, and the TC4 titanium alloy has wide application prospects in the fields of aerospace, medical treatment and the like.

The multi-material selective laser melting forming follow-up type wind field system is installed in an equipment forming chamber and comprises a frame structure, a dust removal unit and a motion control unit. The dust removal unit is connected to the frame structure, and motion control of the dust removal unit is achieved through the motion control unit. The mode of a fixed wind field covering the whole forming chamber is changed, an efficient and controllable wind field is provided for each forming unit for laser scanning through a dust removal unit capable of precisely moving along a guide rail, and the dust removal process has the advantages of being small in working area and capable of being precisely controlled. According to the multi-material selective laser melting and forming precise dust removal device, multi-material selective laser melting and forming precise dust removal with partition covering, unit follow-up and adjustable parameters can be achieved, smoke dust splashing is eliminated from the source, the problems that in the multi-material selective laser melting process, smoke dust splashing occurs, and a powder bed and an entity are polluted by airflow are effectively solved, and the application prospect of multi-material selective laser melting and forming is effectively promoted.

This invention belongs to the field of laser additive manufacturing technology, specifically relating to a dual-spot parallel scanning additive manufacturing system and method. A laser generation unit dynamically distributes a laser beam to the first and second optical paths according to a preset energy ratio through polarization beam splitting. The spot generation unit uses two spatial light modulators to modulate the two beams into patterned spots and dot spots respectively. The filtering and imaging unit filters and images the two beams. The parallel scanning unit drives the dual spots to scan synchronously on a powder bed. The control unit performs model slicing and patterned region segmentation, and dynamically allocates energy and synchronously controls all units to work together based on the segmentation results. This achieves a single laser, dual optical paths, irregularly shaped spots, and parallel scanning, simultaneously balancing processing efficiency and forming accuracy, effectively solving the technical problem of traditional single-spot methods that struggle to achieve both efficiency and accuracy.

To suppress deformation occurring during shaping in a method for three dimensional shaping by laminating thin layers formed by melting and solidifying powder.SOLUTION: In a powder bed type three dimensional shaping apparatus, metal powder is irradiated with a laser, the powder is melted and solidified to form a thin layer, and the thin layer is laminated to perform three dimensional shaping. At this time, a high-density layer L21 having a high density and a porous-density layer L22 having a low density are formed in a mixed manner by changing the amount of energy of laser irradiation. The high density layer and the microporous layer can be formed in various thicknesses (test pieces P2 to P4), and the high density layer and the microporous layer may be alternately formed (test pieces P6 to P9). In this way, by forming the high-density layer and the porous layer in a mixed manner, it is possible to suppress distortion without lowering the mechanical strength of the shaped article.SELECTED DRAWING: Figure 2

An additive manufacturing method for 8Cr4Mo4V steel based on a bimodal particle size distribution powder is disclosed. This invention aims to address the problem of low density in products manufactured using laser powder bed fusion molding (LBD) with unimodal metal powder. The additive manufacturing method comprises: 1. Heating and melting 8Cr4Mo4V bearing steel rods in a vacuum environment, obtaining metal powder through gas atomization, and then sieving it into fine and coarse powders to obtain bimodal particle size distribution 8Cr4Mo4V steel powder; 2. Using a laser powder bed fusion molding process, controlling parameters such as laser power and scanning speed, to form 8Cr4Mo4V steel components. This invention improves powder bed packing density by controlling the ratio of fine to coarse 8Cr4Mo4V steel powder to construct a powder raw material with a bimodal particle size distribution, while simultaneously optimizing the laser powder bed fusion process parameters to achieve precise forming of 8Cr4Mo4V steel components with a dense microstructure and high surface quality.

The invention provides a laser directional energy deposition and laser powder bed melting composite additive manufacturing device, and aims to fuse two additive processes of laser directional energy deposition and laser powder bed melting together and solve the problems of low additive manufacturing efficiency and waste of metal materials of a complex geometric structure by matching with variable regulation and control of a processing range. The device comprises a positioner module, a protective gas module, a laser powder bed melting module, a laser directional energy deposition module, a lead screw guide rod moving module and a push rod moving module. The position changing machine module achieves lifting, front-back swinging and rotating of the workpiece. The laser powder bed melting module can adjust the machining range; the laser directional energy deposition module can quickly realize laser additive machining and manufacturing, and the machining efficiency is balanced; the lead screw and guide rod moving module can achieve free movement of the laser powder bed melting module and the laser directional energy deposition module. The push rod moving module solves the problem that the two modules do not interfere with each other and move freely relative to each other on one lead screw.

The application provides a method for stabilizing a powder bed laser melting process, belonging to the technical field of additive manufacturing, comprising determining input energy of a single laser scanning; determining a particle size distribution of a powder bed; determining median particle sizes of powders of each particle size layer of the powder bed according to the particle size distribution of the powder bed; preparing required powders of each level according to the particle size distribution of the powder bed and the median particle sizes of the powders of each particle size layer; and layer by layer laying the powders of each layer on a forming substrate of a laser powder bed melting device according to the particle size distribution and the median particle sizes of the powders of each layer to build the powder bed. The application solves the problems of laser energy transmission attenuation and uneven heat accumulation under the condition of large layer thickness. The high-efficiency forming and high-quality forming are realized under the condition of large layer thickness, the high precision and excellent performance possessed by traditional thin layer printing are obtained while the high printing efficiency is maintained, and a feasible path is provided for the large-scale application of the laser powder bed melting technology in the manufacturing of large and complex metal components.

A recoater supplies a predetermined amount of powder and spreads the supplied powder across a powder bed. The recoater includes a main shaft, a moving mechanism, and a powder guiding part. The main shaft rotates about an axis parallel to a surface of the powder bed. The moving mechanism moves a main shaft in a moving direction perpendicular to the main shaft and parallel to the surface of the powder bed. The powder guiding part is disposed around the main shaft along a predetermined inclination angle relative to the moving direction.

The application discloses an additive manufacturing method based on non-complete melting metal powder and belongs to the technical field of metal additive manufacturing. The additive manufacturing method based on non-complete melting metal powder comprises the following steps: obtaining a three-dimensional model of a target component, slicing and layering the three-dimensional model and planning a scanning path, and importing slice data and scanning path planning data into an additive manufacturing device; laying metal powder on a substrate to form a powder layer; controlling an energy beam to scan the powder layer according to slice data of the target component; repeating the powder layer laying and scanning steps to process layer by layer to obtain the component. The application precisely controls the energy density of the energy beam within a process window in which the surface of the metal powder is melted and bonded while the core is not melted, and the component is formed by layer-by-layer scanning, thereby solving the technical problems of high residual stress, cracks and poor organization performance caused by complete melting in the powder bed melting technology in the prior art.

The invention relates to the field of preparation of metal spherical powder, in particular to a preparation method of niobium alloy spherical powder, and a spherical powder preparation process including coarse powder recycling is constructed by integrating plasma rotating electrode powder preparation and induction plasma spheroidizing processes. The fine powder accounts for more than 99% of 15-53 [mu] m and can be directly used for 3D printing, and the coarse powder is more than or equal to 53 [mu] m; and carrying out hydrogenation, ball milling, secondary screening, induction plasma spheroidizing and vacuum dehydrogenation on the coarse powder, and mixing the coarse powder with the fine powder to obtain the final niobium alloy spherical powder. According to the technology, efficient preparation of the high-quality niobium alloy spherical powder is achieved, the proportion of the finished product 15-53-micron fine powder is larger than or equal to 96%, the fine powder yield is larger than or equal to 85%, the oxygen content is smaller than or equal to 250 ppm, the spheroidization rate is larger than or equal to 95%, and the technology is suitable for powder bed laser melting additive manufacturing and suitable for the fields of aerospace, nuclear power, military industry and the like.

The application provides a laser powder bed melting forming online monitoring device and method using OCT. The method adds OCT imaging scanning technology in the powder bed melting forming process, forms a layer and scans a layer, so that the surface morphology of the forming process can be accurately characterized, thereby realizing the functions of accurately identifying defect morphology, classification and distribution, and further accurately studying the influence of process parameters on the forming quality. The method is convenient to operate, high in production and detection efficiency, and can further improve the production efficiency of the laser powder bed melting.

The invention discloses a high-density laser powder bed molten high-temperature alloy difficult to weld as well as a preparation method and application of the high-temperature alloy. The preparation method comprises the steps that alloy powder serves as a raw material, and the high-temperature alloy difficult to weld is prepared through the laser powder bed melting technology of double laser beams; wherein the laser heat source of the first laser beam is in Gaussian distribution, and the laser volume energy density is 40-55 J / mm < 3 >; a laser heat source of the second laser beam is flat-topped light or a transverse elliptical light beam, the laser volume energy density is 30-40 J / mm < 3 >, and the starting time interval of the first laser beam and the second laser beam is 0.15-0.25 s. According to the method, the second beam of laser is introduced into the laser powder bed melting technology, the type and the interval time of the second beam of laser are adjusted and optimized, large-size printing defects are annihilated in situ, the forming quality of the high-temperature alloy difficult to weld is remarkably improved, and a new solution is provided for preparing the high-performance and high-density alloy.

An information processing apparatus includes a defect candidate specifying unit configured to specify a plurality of defect candidates positioned at substantially the same positions in a plurality of layers adjacent to each other in a stacking direction; a defect detection unit configured to detect a defect remaining in a manufactured object based on a size of the plurality of defect candidates positioned at the substantially same positions and specified in the plurality of layers in the stacking direction and a size of each of the plurality of defect candidates in the layer; and a display control unit configured to create a visualized image obtained by visualizing defect information and to perform control such that the visualized image is displayable on a display unit during powder bed fusion additive manufacturing.