102 results about "Melt pool" patented technology

Methods for laser processing of reflective metals. A reflective metal (2) is heated by applying a laser beam (6) to a layer of flux (4) in contact with the reflective metal, in which the flux is a powdered flux composition. The laser beam (38) may be applied to a powdered flux composition (36) such that thermal energy absorbed from the laser beam is transferred to a reflective-metal filler material (32) situated on a support material (30), and the powdered flux composition and the reflective-metal filler material melt to form a melt pool (40) which solidifies to form a metal layer (42) covered by a slag layer (44).

An apparatus and method for performing an ALM process is described. A first energy beam source (1) provides an energy beam (1b) which selectively melts a substrate powder (3) into a melt pool. A second energy beam source (2) provides an energy beam (2b) to heat condition substrate powder proximate to the melt pool. The path of the second energy beam (2b) is controlled by a controller (6) to oscillate independently of the path followed by the first energy beam (1b). The method may be applied to control and optimise heating and cooling rates of the sintered substrate during the ALM process enabling its microstructure to be controlled to suit the end use of the product and reduce the occurrence of residual stresses and consequent crack propagation.

The invention provides a fine clarifying method applicable to an electric melting furnace and a device; a clarifying pool is connected with a rising channel of the electric melting furnace; the viscosity of molten glass is kept less than 102.0-103.0dPa.s, the area of the clarifying pool is 20-50 percent of the area of a melting pool, and the depth of the clarifying pool is 300-800mm; the rear part of the clarifying pool is connected with a pressure-reducing cover; the viscosity of the molten glass in the pressure-reducing cover is about 103.0-104.0dPa.s, so as to lead the partial pressure in the pressure-reducing cover to be small than the partial pressure in the molten glass; the gas remained in the molten glass overflows; a material-supplying channel is connected with the rear part of the pressure-reducing cover; by further temperature-reducing adjustment of the material-supplying channel, so as to achieve the needed viscosity of a forming machine or a material-supplying device; by the technique for fine clarifying and the device, the diameter of the bubble of the glass product is smaller than 0.2mm, the quantity of the bubble is smaller than or equal to 5 for every 1000g of glass, thus achieving the melting quality level of optical glass.

The invention discloses a method for monitoring a laser melting pool in real time and relates to the technical field of temperature monitoring in a laser re-melting process. A device for realizing the method comprises a bracket, an infrared probe, an alarming device and a control box, wherein the bracket is arranged on a main shaft; the infrared probe used for acquiring temperature information of the laser melting pool and the alarming device are arranged on the bracket; the control box is used for processing the temperature information acquired by the infrared probe and is provided with a displayer; a control circuit is arranged in the control box, is connected with a power switch of a temperature field through a relay and comprises a central controller, and a measured temperature analytical model displayer, a data storage module, a communication module and a power module which are respectively connected with the central controller; the communication module is connected with an upper computer. The method has the advantage that great convenience is brought to the acquisition and analysis of the temperature field in the laser re-melting process.

A system (100) and method (300) of monitoring a powder (142)-bed additive manufacturing process is provided where a layer of additive powder (142) is fused using an energy source (120) and electromagnetic emission signals are measured by a melt pool monitoring system (200) to monitor the print process. The measured emission signals (250) are analyzed to identify outlier emissions (254) and clusters of outliers are identified by assessing the spatial proximity of the outlier emissions (254), e.g., using clustering algorithms, spatial control charts, etc. An alert may be provided or a process adjustment may be made when a cluster is identified or when a magnitude of a cluster exceeds a predetermined cluster threshold.

An additive manufacturing system includes a laser device, a build plate, a first scanning device, and an alignment system. The laser device is configured to generate a laser beam. The build plate has a position relative to the laser device. The first scanning device is configured to selectively direct the laser beam across the build plate. The laser beam generates a melt pool on the build plate. The alignment system includes a fiducial marks projector configured to project a plurality of fiducial marks across the build plate. Each fiducial mark has a location on the build plate. The alignment system also includes an optical detector configured to detect the location of each of the fiducial marks on the build plate. The alignment system is configured to detect the position of the build plate relative to the laser device.

The invention provides a carbide material for cutting devices and an associated method of manufacture. There is provided a carbide material (34) comprising Tungsten Carbide of 60 to 85 weight%, Titanium Carbides of 10 to 25 weight% and preferably a metal matrix of 0.5 to 20 weight% comprising Fe and optionally at least one or both of the metals Co or Ni. There is also provided a device comprisinga ferrous substrate and such a carbide material and a method of manufacturing a device, the method comprising mixing powders comprising Carbon, Tungsten and a scavenger material such as Titanium, placing the mixed powders proximal a ferrous substrate (10), impinging an energy source (31) onto the powdered materials to create a melt pool (32) formed of the powders and the material of the substrate,and allowing the melt pool to solidify to form a carbide material (34) substantially free from Iron Tungsten carbides of (W, Fe)6 C and (W, Fe)12 C type.

This invention discloses one resides sticky rapid rest method and its device, which comprises the following steps: measuring melt pool resides temperature; drilling the resides into funnel; the funnel exit end sets one level tube to test melt resides level tube flow length; according to the measured flow length to get relative temperature melt resides sticky degrees on standard curve.

The invention provides a numerical simulation method for microstructure evolution of magnesium alloy selective laser melting, which comprises the following steps of: simulating laser scanning by adopting a Gaussian surface heat source model; obtaining a flow field and a temperature field of a selective laser melting pool; applying a VOF method to track a free interface; selecting a specific two-dimensional section in a macroscopic geometric model to perform microstructure simulation calculation; respectively establishing an equiaxed crystal nucleation model in the molten powder and a nucleation model of columnar crystals epitaxially grown on the edge of the melting pool; respectively establishing a solid-phase solute diffusion model and a liquid-phase solute diffusion model; determining a growth kinetic model of dendritic crystals, and performing iterative calculation according to a cellular capture rule; and storing the data obtained by calculation, and carrying out visualization processing. The method can accurately and quantitatively predict the microstructure evolution process of the magnesium alloy in the selective laser melting process.

A method of controlling an additive manufacturing process in which a directed energy source is used to selectively melt material to form a workpiece, forming a melt pool in the process of melting, the method comprising: using an imaging apparatus to generate an image of the melt pool comprising an array of individual image elements, the image including a measurement of at least one physical property for each of the individual image elements; from the measurements, mapping a melt pool boundary of the melt pool; computing a algebraic connectivity of the melt pool; and controlling at least one aspect of the additive manufacturing process with reference to the algebraic connectivity.

A system and method of monitoring a powder-bed additive manufacturing process is provided where a layer of additive powder is fused using an energy source and electromagnetic emission signals are measured by a melt pool monitoring system to monitor the print process. The method includes determining thermal conductive properties of the part and the powder bed, e.g., by estimating thermal lag between the printing of adjacent portions of the part or determining thermal resistance using a thermal model of the part and the powder bed. The method may include obtaining a predicted emission signal based at least in part on these thermal conductive properties and comparing with measured emission signals. An alert may be provided or a process adjustment may be made when a difference between the measured emission signals and the predicted emission signal exceeds a predetermined error threshold.

A filler feed wire (20) including both a laser conductive element (26) and a filler material (22) extending along a length of the wire. Laser energy (30) can be directed into a proximal end (32) of the laser conductive element for melting a distal end (34) of the feed wire to form a melt pool (24) for additive fabrication or repair. The laser conductive element may serve as a flux material. In this manner, laser energy is delivered precisely to the distal end of the feed wire, eliminating the need to separately coordinate laser beam motion with feed wire motion.

The invention relates to a large-dip-angle self-leveling device. The large-dip-angle self-leveling device comprises a mounting base platform arranged on a mounting stand column and a supporting cylinder connected with the mounting base platform. A leveling plate is arranged at the top of the mounting base platform, and a leveling platform is arranged on the leveling plate. A spirit bubble indicator and a control circuit board are arranged on the leveling platform. A balance weight connecting rod is arranged in the supporting cylinder, one end of the balance weight connecting rod is connected with the leveling platform, and the other end of the balance weight connecting rod is connected with a balance weight. A four-core cable penetrates through the balance weight connecting rod and the balance weight. Observation windows are symmetrically arranged at the lower part of the supporting cylinder. A melting pool is arranged at the bottom in the supporting cylinder, and special hot melt adhesive is contained in the melting pool. A heating pipe is inserted into the special hot melt adhesive and is connected with the balance weight through an epoxy resin heat insulation sleeve. One end of the four-core cable is connected with the control circuit board, and the other end is connected with the heating pipe. The large-dip-angle self-leveling device is low in cost, high in leveling reliability and suitable for installation of instruments and equipment needing to be kept in a horizontal state in the working process of the measuring instruments.