136 results about "Melt pool" patented technology

The invention belongs to the technical field of additive manufacturing, and particularly relates to an additive manufacturing process defect detection method based on multi-sensor data fusion. According to the method, multi-modal information such as a temperature field signal, a molten pool signal, a spectral signal and a sound signal in an electric arc additive manufacturing process is combined; special elements are monitored on line in the printing process, a neural network of a Transform architecture is adopted for data processing, a multi-head attention mechanism in the Transform network can effectively capture data correlation in a global range, the advantage of signal complementation between different sensors can be better played, and the printing accuracy is improved. Effective detection of the surface appearance and internal defects of the formed weld bead in the electric arc additive manufacturing process is achieved.

The invention discloses a laser electron beam composite additive manufacturing method and system, and relates to the field of laser directional energy deposition, an electron beam is used as a heat source to melt metal powder, and a molten pool is formed on the surface of a substrate; three indexes including the temperature, the form and depth and the surface defect of the molten pool are obtained in real time, and when the three indexes meet preset conditions at the same time, laser serves as a main heat source, electron beams serve as an auxiliary heat source, and the metal powder continues to be molten till deposition is formed; in the cooperative working process of the laser and the electron beam, an energy distribution diagram is constructed based on multiple pieces of detection data, and temperature and form distribution of a molten pool are obtained; laser parameters and electron beam power parameters are adjusted in real time based on the temperature and form changes of the molten pool; the preset conditions are that the average temperature of the molten pool reaches a set stable temperature interval, the surface fluctuation of the molten pool is reduced to a set standard range, and the defect occurrence rate is lower than a set threshold value. The deposition precision can be improved, the thermal stress influence can be reduced, defects can be reduced, and efficient energy utilization is achieved.

Disclosed in the present invention are a quality monitoring method and system for a selective laser melting process, and a defect locating method and system for same. The quality monitoring method in the present invention comprises: collecting melt pool images in a selective laser melting process in real time; then performing melt pool contour extraction on the melt pool images that belong to the same printing layer, and calculating melt pool areas and center points of melt-pool-contour minimum bounding rectangles; creating a blank image having the same size as the melt pool images, and marking, at a corresponding position in the blank image, the center point of each melt-pool-contour minimum bounding rectangle; gridding the blank image, and filling grid cells, in which marks are located, with values of the melt pool areas of corresponding melt pools, so as to generate a grid matrix; dividing the grid matrix into blocks, and converting each block into a grayscale sub-image; and inputting the grayscale sub-images into a trained neural network model, so as to obtain a quality classification result.

The invention relates to the technical field of additive manufacturing, and discloses an additive manufacturing hot-crack-free precipitation strengthening high-temperature alloy and a preparation method thereof.The method comprises the steps that a laying layer is divided into a plurality of parallel scanning strips according to the preset translation direction and the scanning strip interval, strip type scanning is conducted in a laser autorotation and translation motion coupling mode, and the high-temperature alloy is obtained; molten pool disturbance is remarkably enhanced, periodic shear fracture of the tip of dendritic crystal is achieved, epitaxial growth of columnar crystal is broken, grain equiaxalization is achieved, and anisotropy is weakened; in addition, laser scanning is a high-speed scanning strategy with the translation speed larger than or equal to 1500 mm / s, a shallow molten pool is formed through regulation and control of the high scanning speed, surface tension in the shallow molten pool is utilized, convection in the molten pool is enhanced, dendritic crystals are refined, columnar crystals in the high-temperature alloy are further reduced, and anisotropy of mechanical properties is remarkably eliminated; and the transverse strength and creep resistance at high temperature are improved. The isometric crystals can effectively prevent cracks from expanding in the orientation direction of the columnar crystals, and the fatigue life and the damage tolerance are remarkably prolonged.

The invention belongs to the technical field of molten pool shape adjustment, and discloses a method, device, equipment and medium for adjusting the shape of an additive manufacturing molten pool in real time, and the method comprises the steps: obtaining a molten pool image of the additive manufacturing molten pool and a corresponding molten pool marking image, and constructing a molten pool image segmentation model according to the molten pool image and the corresponding molten pool marking image, periodically acquiring real-time molten pool images of the additive manufacturing molten pool, inputting the real-time molten pool images into the molten pool image segmentation model, extracting to obtain molten pool segmentation images only containing the additive manufacturing molten pool, calculating to obtain real-time molten pool flow velocity through molten pool approximate geometric centers of the molten pool segmentation images of adjacent frames, and adjusting the flow velocity of the molten pool through a laser adjusting formula. With the target molten pool shape as a target, the molten pool shape of the additive manufacturing molten pool is adjusted; the shape of the molten pool is adjusted through the laser adjusting formula, the real-time molten pool flow speed and the target molten pool shape, and the precision and stability of the additive manufacturing molten pool are improved.

A processing apparatus includes: an irradiation optical system configured to irradiate an object with first processing light emitted from a first light source, and second processing light that is emitted from a second light source different from the first light source and whose peak wavelength is different from that of the first processing light; and a material supply member configured to supply a build material to a melt pool formed by the first and second processing lights, the peak wavelength of the second processing light is shorter than the peak wavelength of the first processing light, and a second area irradiated with the second processing light is larger than a first area irradiated with the first processing light.

The invention discloses a laser additive repair and remanufacturing defocusing amount real-time monitoring and feedback control method based on infrared sensing assistance, and relates to the technical field of additive manufacturing. One end of the self-adaptive clamp is fixed on the laser cladding head, and the infrared camera is fixed on the laser cladding head by the other end of the self-adaptive clamp, so that rigid connection is realized; the infrared camera is mounted on the side of the cladding head, and a certain included angle is formed between an observation angle and a laser vertical direction; the infrared camera captures a molten pool image; the image processing module performs temperature distribution and shape feature extraction on the molten pool image; the center of the molten pool is recognized through an offset calculation module, and offset calculation and mapping are carried out; the offset is transmitted to a controller through a high-frequency data stream, when the offset exceeds a set threshold value, an early warning signal is triggered, and abnormal data are recorded; and based on a fuzzy control strategy, comprehensively analyzing the direction and amplitude of the offset, generating an adjustment instruction, sending the instruction to a servo motor, and restoring the defocusing amount to a target value by adjusting the Z-axis height of the laser cladding head. According to the technical method, the infrared camera is fixed to the laser cladding head through the self-adaptive clamp, and the molten pool image center offset is monitored in real time based on paraxial setting, so that accurate defocusing amount prediction is achieved.

The invention discloses a laser additive manufacturing system and method for in-situ self-adaptive regulation and control of the component shape through a temperature field and an airflow field. The laser additive manufacturing system comprises a sealed protection cavity, a master control unit, a temperature field monitoring-control unit and an airflow field monitoring-control unit. The temperature field monitoring-control unit comprises an infrared thermometer, a thermocouple temperature measuring element and an induction heating coil; and the airflow field monitoring-control unit comprises a protective gas pipeline, an electromagnetic flow regulating valve, an oxygen content monitor and a vacuum air filter. The master control unit comprises a temperature field control module and an airflow field control module. The master control unit conducts in-situ self-adaptive regulation and control on the temperature field of laser additive manufacturing through the temperature field control module, distribution of the temperature field in the whole process of additive manufacturing is improved, the temperature gradient of a molten pool in the laser additive manufacturing process is reduced, the forming defect is improved, and the material performance is improved.

A method of optimizing a powder-bed-based additive manufacturing process is presented. Particularly, the method relates to components with a multi-domain design (CAD1, CAD2), and comprises the steps of, (i), providing a component design (CAD), either as a single file, or as segmented files corresponding to different part sections (D1, D2), (ii) assigning process parameters (P, v) for the layerwise additive manufacture of the component (1) to each domain (D1, D2), (iii), assigning an estimated melt pool dimension (W) to a related process parameter and, (iv), assigning a melt pool overlap (O), to irradiation vectors (V1, V2) of the different domains (D1, D2), respectively, wherein the assigned melt pool dimension (W, W1, Wt) is projected around the related irradiation vectors (V1, V2) and an irradiation vector (V1) of a first domain (D1) is extended into a second domain (D2) corresponding to the assigned overlap (O), when said irradiation vectors (V1, V2) of different type are intended to form a solid structural connection within a given layer. Furthermore, a related system and computer program for carrying out the method are provided.

A method for the additive manufacturing of a thin, angled component structure. The method includes adjusting irradiation parameters from a first layer to a following layer in the construction direction, wherein a line energy and / or a scanning speed is changed for the irradiation of the following layer in order to change a melt pool width of an irradiation path for the following layer, and shifting an irradiation path for the following layer from the first layer in such a way that an angled edge is formed on a side of the component structure being formed opposite a movement direction. A correspondingly manufactured component and a computer program product are provided.

A processing system includes: a processing apparatus for processing an object by irradiating the object with an energy beam to form a melt pool on the object and supplying a build material to the melt pool; an imaging apparatus for imaging the melt pool to generate a melt pool image; and a control apparatus for generating melt pool image information based on the melt pool image and for controlling the processing apparatus based on the melt pool image information so that a size of the melt pool is a target size, the melt pool image information is generated based on a plurality of melt pool images, the control apparatus changes, based on a processing condition of the object, an imaging condition for the imaging apparatus imaging the melt pool.

The invention discloses a glass kiln bottom temperature control method and system and a glass kiln, and belongs to the technical field of glass kilnes.Temperature information of each detection point is obtained from a plurality of detection points between the bottom of a melting pool and a working pool, and deviation and trend related to the temperature of the detection point are calculated according to the temperature information; the deviation of all the detection points is subjected to weight calculation to obtain the comprehensive deviation of the temperature, the trend of all the detection points is subjected to weight calculation to obtain the comprehensive trend of the temperature, the arch top temperature adjustment amount is obtained through the comprehensive deviation and the comprehensive trend calculation, and control linkage of the pool bottom temperature and the arch top temperature is achieved. After the target temperatures of a plurality of detection points are manually set, the pool bottom temperature and the arch top temperature control are automatically adjusted and fed back, so that the dependence of pool bottom temperature adjustment on manual trend judgment is reduced, the pool bottom temperature is automatically controlled, the stability of the pool bottom temperature is improved, and the fluctuation range of the glass liquid temperature is further reduced.

The invention relates to the field of laser additive manufacturing, and particularly discloses a laser coaxial fuse additive manufacturing device and method based on double-magnetic-field collaboration.The laser coaxial fuse additive manufacturing device comprises a movement system, a coaxial fuse additive manufacturing system, a double-magnetic-field auxiliary system and a control monitoring system, and a wire feeding mechanism is arranged outside the device. The double-magnetic-field auxiliary system is composed of a magnetic pressure induction system and a symmetrical sliding type magnetic field generation system. The magnetic pressure sensing system is arranged around the welding head and generates a vertical magnetic field; the symmetrical sliding type magnetic field generation system generates a horizontal magnetic field through Helmholtz coils on the two sides. The two magnetic field systems are mutually independent and adjustable and form orthogonal configuration in space. The device is provided with a high-speed camera to monitor the state of the molten pool in real time, the magnetic field intensity and proportion are dynamically adjusted through a controller and double electromagnetic generators, and accurate control over molten drop transition and molten pool flowing is achieved. According to the invention, the quality and stability of coaxial fuse additive manufacturing are improved.

The invention discloses an electric arc additive lamination parameter real-time regulation and control system and method based on reverse modeling, and the method comprises the steps: obtaining data in an additive process through a data obtaining unit, carrying out the comparison with a theoretical model, obtaining defect data in an additive, carrying out the analysis, recognizing the defect type and severity, and carrying out the real-time regulation and control of the parameters. And in combination with information such as molten pool parameters, temperature field parameters, melt channel defects and component forming deviation, follow-up electric arc additive lamination parameters are corrected through parameter self-adaptive adjustment, and real-time automatic regulation and control of the lamination parameters in the electric arc additive process are achieved. The method has good generalization ability, is suitable for large complex components, and improves the stability of the electric arc additive process, reduces the defects of the electric arc additive component and improves the performance and quality of the electric arc additive component by automatically regulating and controlling parameters in the electric arc additive process in real time.

A processing system includes: a processing apparatus for processing an object by irradiating the object with an energy beam to form a melt pool on the object and supplying a build material to the melt pool; an imaging apparatus for imaging the melt pool to generate a melt pool image; and a control apparatus for generating melt pool image information based on the melt pool image and for controlling the processing apparatus based on the melt pool image information so that a size of the melt pool is a target size, the melt pool image information is generated based on a plurality of melt pool images, the control apparatus changes, based on a processing condition of the object, an imaging condition for the imaging apparatus imaging the melt pool.

The invention discloses a selective melting beam shaping and residual stress regulation cooperation method and system, and belongs to the technical field of selective melting additive manufacturing. The method comprises the steps that slicing data of a to-be-formed part are obtained, and characteristic parameters of all areas are analyzed; light beam spot parameters are adjusted in real time through a dynamic light beam shaping module based on the characteristic parameters; in the forming process, stress associated data of a molten pool and a heat affected zone are collected through a multi-dimensional stress monitoring module; the cooperative control unit analyzes the data based on a preset correlation model and judges stress abnormity; if yes, light spot parameter adjustment and stress regulation and control operation are synchronously controlled; and subsequent forming parameters are corrected through a closed-loop algorithm. The system comprises corresponding function modules and a process database. According to the method, light beam shaping and residual stress regulation are coordinated, the residual stress of parts is effectively reduced, deformation and cracking are reduced, the forming precision and the production efficiency are both considered, the process stability is improved, and the adaptation range of materials and complex structures is widened.

A schlieren system for in-situ / online monitoring of spatter in a large-area melt pool is provided, including a parallel light generation part, a parallel light deflection part, and an image acquisition part. The system can monitor spatter and other physical phenomena in the melt pool in a process of multi-layer printing and adjust a monitored area during an experiment to expand a monitored range. A reflector group composed of a plurality of plane mirrors is arranged, such that an optical path can be kept away from powder and dust areas, avoiding interference between the schlieren system and inherent devices inside a build chamber. Communication between a laser path controller and an optical path deflecting mirror galvanometer motor controller is established to automatically control the plane mirrors to change the monitored area, automatically track the melt pool, and realize online monitoring.

The invention relates to the technical field of solid waste harmless and recycling equipment, in particular to a gradient temperature pyrolysis-melting vitrification integrated treatment device and process for red mud. According to the device, an electromagnetic heating rotary kiln pyrolysis section and an electrode melting section are directly coupled with a material transfer device through high-temperature atmosphere isolation. The process comprises the following steps: granulating red mud, a reducing agent and a flux, feeding into a rotary kiln of which the temperature is accurately controlled by multiple groups of electromagnetic induction coils in a partitioned manner, and sequentially completing dehydration, selective reduction and iron particle polymerization to produce gt; high-temperature pyrolysis slag at 1000 DEG C; the pyrolysis slag directly falls into an electric melting pool to complete melting and iron-slag liquid phase separation under absolute isolation of reducing atmosphere and oxidizing atmosphere by the device, and pig iron and a stable glass body are respectively obtained. Through the design of'hot slag direct melting 'and'energy closed loop', the problems of high energy consumption and complex flow of the traditional process are solved, and efficient recovery of iron resources in the red mud and thorough harmless and high-valued utilization of the residues are realized.

An automated method of measuring, monitoring and recording candle burn performance using vision system automation. The method includes timed candle flame height measurement consisting of a camera using image bursts. Recording in a database with a unique identifier barcode for each candle and corresponding wick to identify and record candle data with a date and time stamp. Audio-Visual alerts for flame callouts less than ½ inch or greater than 2 inches and 3″. Documenting any extinguished candles / wicks (mid and / or end of life). Candle Temperature Measurement is performed every 2 hours (depending on burn type and cycle), which includes wax melt pool temperature (with callouts for temperatures reaching and / or exceeding 250 deg C.) and container side wall temperature. Candle Picture is performed at the mid and end of life, and the sustainer position is tracked to determine wick migration.

The utility model relates to a glass kiln pool wall structure which comprises a first pool wall brick, a second pool wall brick, a pool bottom brick, a first pool wall cushion brick and a second pool wall cushion brick. The pool bottom brick is laid at the bottom of the melting pool, the second pool wall brick is located above the pool bottom brick, the first pool wall cushion brick and the second pool wall cushion brick are located between the pool bottom brick and the second pool wall brick, a gap is formed between the first pool wall cushion brick and the second pool wall cushion brick, the first pool wall brick is located above the second pool wall brick, and the projection of the first pool wall brick in the vertical direction is larger than the projection of the second pool wall brick in the vertical direction. And close to one side of the melting tank, the first tank wall brick protrudes out of the second tank wall brick. According to the technical scheme, the problem that the service life of a glass kiln is shortened due to the fact that the thickness of the pool wall brick located at the three-intersection interface after erosion is too small in the prior art is effectively solved.

The application discloses a kind of safety automatic control flow's casting equipment, including melt pool, aluminium water inlet pool and pump chamber, melt pool is connected to aluminium water inlet pool by aluminium water channel in furnace, pump chamber is connected with aluminium water inlet pool by bottom inlet channel, impeller is provided in pump chamber, aluminium water outlet channel is connected with aluminium water steady flow pool above pump chamber, aluminium water steady flow pool bottom is provided with steady flow pool flow eye, steady flow pool flow eye is connected with outlet flow groove, steady flow pool flow eye outer end is provided by the plug head for plugging steady flow pool flow eye;Method, S1: melt raw material in melt pool, obtain aluminium water;S2: aluminium water flows into to pump chamber, then flows into to aluminium water steady flow pool;S3: aluminium water in aluminium water steady flow pool, flow into to outlet flow groove;S4: aluminium water in outlet flow groove flows into to corresponding aluminium piece casting tray, corresponding need to be manufactured aluminium piece can be obtained;Effect: method structure is novel, steady flow pool flow eye and melt pool are not directly communicated, increase insurance for aluminium casting safety, guarantee safety.

The problem of non-ideal layer geometry in 3D printing processes is addressed by systems and methods that employ laser triangulation measurements in the vicinity of the melt pool. The systems and methods generally direct one or more lasers at one or more locations along or perpendicular to a direction of travel of a 3D printing energy source. The one or more lasers are reflected from the one or more locations and received by an optical detector, which generates one or more signals in response to receiving the one or more reflected lasers. The signals are received by a controller, which determines one or more heights of the surfaces at the one or more locations based on the one or more signals. The lasers are scanned across a layer of a 3D printed part to obtain the height of the surface across the layer.

The problem of limited throughput in three-dimensional (3D) printing processes is addressed by systems and methods that employ mirrors to receive energy reflected by the melt pool and to redirect such light back to the melt pool, where it may further heat the melt pool. Multiple such passes of reflection from the melt pool and redirection back to the melt pool may substantially increase the efficiency at which the melt pool absorbs the energy, thereby substantially increasing the throughput of the 3D printing process.

A method for preparing a magnesium alloy tissue engineering scaffold with a smooth inner surface by laser powder bed fusion (LPBF) is provided. The method includes: step S1: scanning a porous scaffold, and selecting the densest filling scan parameters, where the scanning includes a single-pass contour scan and a single-pass filling scan; step S2: optimizing a contour scan strategy according to the densest filling scan parameters; step S3: acquiring a corresponding melt pool dimension, and adjusting a spot compensation value based on the optimized contour scan strategy; and step S4: preparing a magnesium alloy tissue engineering scaffold based on the contour scan strategy and the adjusted spot compensation value. The method eliminates powder adhesion and sagging defects inside the complex porous structure that severely affect inner surface roughness and scaffold performance, thereby the pore connection, fatigue and corrosion resistance will be improved greatly.

The application discloses an aluminum-based 3D printing melt pool behavior intelligent analysis method based on image recognition and relates to the technical field of additive manufacturing process monitoring. The method comprises the following steps: acquiring a time sequence image sequence of a melt pool region in an aluminum-based 3D printing process, performing a pixel-level gray gradient direction coding operation on the time sequence image sequence, and generating a melt pool boundary flow direction feature map; based on the melt pool boundary flow direction feature map, extracting a geometric deformation parameter of a melt pool contour, and mapping the geometric deformation parameter to a printing coordinate space to generate melt pool deformation field distribution data; according to the melt pool deformation field distribution data, tracking displacement vectors of melt pool boundary points between adjacent frames, and calculating a melt pool surface oscillation frequency through the displacement vectors to obtain melt pool oscillation characteristic quantities; and performing phase matching on the melt pool oscillation characteristic quantities and preset melt pool stability criteria to output a melt pool behavior state marker.

The present invention provides a method, device, and system for monitoring additive manufacturing. The method comprises: receiving multi-source synchronous monitoring data during the additive manufacturing process, the multi-source synchronous monitoring data being time-stamped and including at least acoustic signals, temperature field data, melt pool morphology data, and plasma spectrum signals generated during the additive manufacturing process; fusing and analyzing the multi-source synchronous monitoring data based on the timestamps to extract key features characterizing the forming quality; and evaluating the quality of the formed part based on the key features to obtain an evaluation result. The present invention can enhance the comprehensive monitoring capabilities of the additive manufacturing process.

This processing system is provided with: a processing device which is provided with an irradiation optical system and a material supply unit and which models a molded object; a measuring device that acquires information relating to the size of the molten pool formed by irradiation of the processing beam; a recording device that records information relating to the size of the molten pool and information relating to the position of the molten pool in association with each other; and a control device. The control device controls the processing device such that the size of the molten pool formed by irradiation of the processing beam coincides with the size of the molten pool read from the recording device.

The invention belongs to the technical field of liquid metal 3D printing, and particularly relates to a jet flow control system for melt impact, which comprises an upper cavity device, a vacuumizing system, a gas supply system, a pressure monitoring device, a main controller and an upper computer, an upper cavity pressure gauge is mounted at the upper part of the upper cavity device and is used for monitoring the gas pressure in the upper cavity device in real time; a nozzle is arranged on the lower portion of the upper cavity device, the gas supply system is communicated with the upper cavity device, the vacuumizing system is communicated with the upper cavity device, and the upper computer, the upper cavity pressure gauge, the gas supply system and the vacuumizing system are all in communication connection with the main controller. The upper computer is used for inputting an operation instruction to the main controller, so that the main controller controls the gas supply system and the vacuumizing system based on the operation instruction and the gas pressure; through non-mechanical on-off control of gas pressure, rapid opening and closing of jet flow are achieved, it is guaranteed that the solidification and forming process of a molten pool is controllable, and a series of problems caused by a mechanical switch are avoided.

The invention provides a laser wire feeding process parameter control method and system based on machine learning, and belongs to the field of laser wire feeding. The problems that in an existing laser wire feeding process, process parameters need to be manually corrected, efficiency is low, and manual correction errors are relatively large are solved. According to the method, the bead height and the bead width of the monorail sediment are obtained by testing different laser powers, scanning speeds and wire feeding speeds, then a fitting model is obtained from a data set by using a BP neural network, and the model is used for technological processing. By utilizing the process parameter data sample, the bead height and the bead width of the sediment can be well predicted through the process parameters, and the required process parameters can be reversely predicted through the required bead width and the bead height, so that the shape deviation of a laminated object caused by wrong judgment of observing a molten pool in real time by a technician can be reduced, and the quality of the product is improved. And equipment data can be mined and analyzed, the equipment is endowed with the capability of intelligently processing the technological process, and the professional requirement of the technological process on technologists is reduced.

The techniques described herein relate to controlling a geometry of melt pools in additive manufacturing systems. An example method comprises directing laser energy from laser energy source(s) through an optics assembly and toward a build surface; melting at least a portion of a layer of material on the build surface due to exposure of the portion to the laser energy; and controlling a geometry of melt pools at end portions of scanning trajectories followed by the laser energy source(s), a first scanning trajectory of the scanning trajectories including one or more first scans in a first scanning orientation and a second scanning trajectory of the scanning trajectories including one or more second scans in a. second scanning orientation. Controlling the geometry of melt pools comprises controlling parameter(s) of the laser energy source(s) at end portions of the first scan(s) and at end portions of the second scan(s).