51 results about "Laser metal deposition" patented technology

A method is provided for depositing a hard wear resistant surface onto a porous or non-porous base material of a medical implant. The wear resistant surface of the medical implant device may be formed by a Laser Based Metal Deposition (LBMD) method such as Laser Engineered Net Shaping (LENS). The wear resistant surface may include a blend of multiple different biocompatible materials. Further, functionally graded layers of biocompatible materials may be used to form the wear resistant surface. Usage of a porous material for the base may promote bone ingrowth to allow the implant to fuse strongly with the bone of a host patient. The hard wear resistant surface provides device longevity, particularly when applied to bearing surfaces such as artificial joint bearing surfaces or a dental implant bearing surfaces. An antimicrobial material such as silver may be deposited in combination with a metal to form an antimicrobial surface deposit.

Disclosed is a complicated thin-walled workpiece formation system and method based on progressive formation and additive manufacturing. The system comprises a progressive forming system, a laser metal deposition system and a control system. The progressive forming system comprises a worktable, a three-dimensional movement platform and an electric spindle, wherein the electric spindle is mounted on the three-dimensional movement platform and provided with a tool bit, and the worktable is arranged below the electric spindle and provided with a clamp. The laser metal deposition system comprises a fiber laser, a laser head, a powder feeder and a nozzle. The formation method is to clamp the plate to the fixture of the worktable, the control system controls the electric spindle to drive the tool bit to form the sheet layer by layer and to form the thin-walled shell; and then through laser, metal powder is fused and deposited on the thin-walled shell, and the block-type characteristics are formed. The complicated thin-walled workpiece formation system can realize the small batch and efficient manufacture of the complicated thin-walled workpiece, and has the advantages of saving material, and eliminating the need of mold and the like, and the manufacturing cycle of the complicated thin-walled workpiece is shortened.

The invention discloses an online detecting and eliminating device and method for melt channel material defects in laser metal forming. The device and method are suitable for a laser metal deposition forming process. The device comprises four optical fiber type double-color temperature gauges, and four temperature measuring probes of the optical fiber type double-color temperature gauges are fixed to the left side, the right side, the front side and the back side of a coaxial powder feeding nozzle of a forming system correspondingly; detection aiming points of the four temperature measuring probes are aligned with the left side, the right side, the front side and the back side of a forming scanning laser spot on a forming plane correspondingly, the detection aiming points are away from the center of the laser spot by a certain micro-distance, and the four temperature measuring probes, the coaxial powder feeding nozzle and a laser beam move together; during forming, when the coaxial powder feeding nozzle and the laser beam conduct forming scanning in any one of the -X direction, the X direction, the -Y direction and the Y direction, the temperature measuring probe located at the side opposite to the scanning direction of the coaxial powder feeding nozzle is used for detecting the temperature of the position, away from the laser spot by a certain micro-distance, of a high-temperature melt channel, and when the temperature mutates abnormally, it is judged that the material defects exist in the position, the defect positions are determined, and laser targeted remelting is carried out on the defects.

Aspects of the present disclosure relate to improved laser metal deposition heads. Various embodiments may include a main body, a nozzle seat, a powder flow guide, an inner nozzle, an outer nozzle, and a coolant sleeve. In some embodiments, powder inlets in the main body are angled relative to a primary axis of the laser metal deposition head. In some embodiments, the nozzle seat includes a plurality of powder distribution channels that are also angled relative to the primary axis of the laser metal deposition head.

In a deposition method of forming a buildup on a single crystal or directionally solidified crystal parent material, metal deposition is performed from an extension in a preferential growth orientation of parent material crystals while forcedly cooling a portion of the parent material somewhat below a processed surface and beforehand giving a temperature gradient to the parent material so that a maximum temperature gradient is oriented along the preferential growth orientation of parent material crystals.

A brake disc of the present invention is a brake disc that stops the rotation of an axle when a brake pad is pressed on a surface of the brake disc, including a disc main body that is attached to a rotary body integrally rotating with the axle; and a plurality of build-up layers laminated on a surface of the disc main body, in which the build-up layers are laminated on the surface of the disc main body by means of laser metal deposition welding.

The invention relates to a basic plate preheating system of laser metal deposition shaping. The basic plate preheating system comprises a basic plate pre-heater and a temperature control device thereof, wherein, the basic plate pre-heater has a box structure and is provided with a bottom plate, internal walls and external walls arranged around the bottom plate; heat insulating materials are arranged between the internal walls and the external walls; an electric heating pipe is installed on the bottom plate by the heat insulating materials and copper plates are arranged in the box body and over the electric heating pipe; and a wiring terminal of the electric heating pipe is connected with the temperature control device. The basic plate preheating system provides a stable temperature field for the laser metal deposition shaping technique, effectively reduces the temperature gradient of a sample and the basic plate during the shaping, and has high automation, good uniformity in preheating of the basic plate and high control precision, thus providing an effective solution to cracks or even breaks existing in the laser metal deposition shaping technique.

The invention discloses a nuclear power plant control rod driving mechanism hook jaw and a preparation method thereof. The hook jaw comprises a hook jaw body formed by printing two materials by multiple layers in a sequential stacking manner, and wear resisting layers; and the wear resisting layers are formed on the inner peripheral wall of a shaft pin hole and the outer surface of a tooth tip in an embedding manner. The preparation method comprises the following steps: (S1) a 3D printing manufacturing process is formulated according to the structure of the hook jaw; (S2) the 3D printing manufacturing process is used for sequentially stacking multiple layers to print a hook jaw blank; and (S3) after the hook jaw blank is manufactured by 3D printing, machining equipment is used for machining to form the pin shaft hole, the tooth tip and a hook jaw groove to obtain the molded hook jaw. The material organization of the hook jaw is improved by dint of laser metal deposition, so that each part of the hook jaw manufactured by dissimilar materials is more compact and more uniform, the mechanical performance is greatly improved, the surface wear resistance and the impact resistance are improved, and meanwhile, the yield of the hook jaw and the long-time service reliability are improved.

First, an annular first layer including a plurality of beads and having a width that is not less than twice a width of the bead is formed by laser metal deposition on a peripheral surface of a base metal, the peripheral surface facing outward or inward in a radial direction. Next, a plurality of annular height raising layers each including a plurality of beads are stacked on the first layer by the laser metal deposition. According to this configuration, an axisymmetric body including a flange portion having a relatively wide width can be manufactured while making a heat affected zone in the base metal extremely small.

The invention relates to the field of metal machining, and particularly discloses a repair method of a single crystal/directional solidified nickel-based high-temperature alloy and application of therepair method. The method comprises the following steps that 1, a transition layer is formed on the surface of a to-be-repaired part of the single crystal/directional solidified nickel-based high-temperature alloy through a thermal conductance type melting mode; and 2, laser metal deposition treatment is performed on the transition layer to form a deposition layer, wherein the laser peak power ofthe laser metal deposition is 600 W-1200 W, the laser peak valley power is 50 W-150 W, the ratio of the laser peak power duration to the laser peak valley power duration is 1:4 to 3:2, and the laser frequency is 50 Hz-250 Hz. According to the repair method and the application, the method is simple to operate and remarkable in effect, compared with a traditional repair method, the method is beneficial to simultaneously guarantee the inhibition of thermal cracks and the continuous growth of columnar crystals, so that the production period is reduced.

A part, such as an automotive part, is provided. The part includes at least two work pieces which are joined together at a weld seam. The weld seam has a laser metal deposition layer with at least one of nickel and iron, and the laser metal deposition layer is substantially entirely free of silicate islands. The part further includes a painted, phosphate or electrocoated coating which is bonded with at least a portion of the laser metal deposition layer of the weld seam.

The invention discloses a method for preparing a CNTs (carbon nanotubes) reinforced high-entropy alloy laser deposition composite material. According to the method, FeCoCrAlCu-SiB6-(Ni/Ag coated-CNTs)mixed powder is deposited on the surface of a TA2 titanium alloy by laser melting with a coaxial powder feeding method in argon atmosphere, an LMD (laser metal deposition) coating is formed, the coating has bcc and fcc structures, hardness of the bcc structure is higher and toughness of the fcc structure is better; a large quantity of CNTs are attached to the surface of ceramic crystallization phase in the coating, growth of the crystallization phase can be effectively inhibited, the organization structure is refined, and therefore, the structure property of the prepared composite material isremarkably enhanced; a high-temperature oxidation test result indicates that high-temperature oxidation property of the CNTs reinforced LMD coating is obviously better than that of a FeCoCrAlCu-SiB6laser deposition layer and the TA2 titanium alloy base material without addition of CNTs. The CNTs reinforced high-entropy alloy laser deposition composite material with compact organization structureand good high-temperature oxidizability can be obtained.

The invention discloses a device for repairing gears by means of laser cladding, belonging to the field of laser processing. The device comprises a three-dimensional mobile platform, a programmable logic controller (PLC) system, a laser metal deposition system, a fixture and a motor. When the device is in use, the gear to be repaired is fixed on the fixture, and the broken teeth of the gear are enabled to be placed on a horizontal plane by controlling the motor. The device has the advantages of being simple in structure and convenient to operate, improving gear repairing quality and efficiency, having higher flexibility, and being capable of clamping the gears with different inner hole sizes.

The invention provides a device and method for refining structure crystalline grains in the metal additive manufacturing process. The device comprises a main laser device and an auxiliary laser device. A main laser path and an auxiliary laser path transmit lasers to the same concentration lens through a light combination lens. The concentration lens generates a composite laser spot composed of a main laser spot and an auxiliary laser spot. The auxiliary laser spot is smaller than that of the main laser spot and can move in the main laser spot. By the adoption of the device and method for refining the structural crystalline grains in the metal additive manufacturing process, a bath is formed through the main laser spot, a key hole is formed through the auxiliary laser spot, the key hole ismade to move in a specific manner to achieve the function of stirring the bath, and therefore the structure crystalline grains are refined; the depth and shape of the key hole can be adjusted by adjusting the parameter of the auxiliary laser; the device and method for refining the structure crystalline grains in the metal additive manufacturing process have no limitation to matrix and powder adopted in the laser metal deposition process and are suitable for formation motion in any form, the situation that in the process of refining the structural crystalline grains, after one cladding layer isobtained, the track is repeated is avoided, and high efficiency is achieved.

The invention belongs to the technical field of laser additive manufacturing, and provides a method for preparing a complex thin-wall component through laser metal deposition and follow-up rolling, which comprises the following steps of: preparing materials before laser metal deposition forming; layering a three-dimensional model of the complex thin-wall component; determining laser metal deposition process parameters; determining roll follow-up rolling process parameters; conducting laser printing on the nth layer, and completing follow-up rolling; repeating the step 3 to the step 5; and performing post-treatment on the thin-wall component. The method can solve problems that when an existing laser metal deposition technology is used for preparing a complex special-shaped thin-wall component, component deformation is caused by residual stress, and a laser beam cannot act on the end face of the component, and the problems that the surface quality is poor and the reliability is reduced due to convex-concave peaks caused by interlayer lap joint on the surface of the formed component, and secondary deformation is easily caused during subsequent machining or laser polishing treatment on the surface of the component.

Systems and methods for additively manufacturing or repairing a component from a base material. The system may include an inoculation source to direct inoculation materials and a laser metal deposition (LMD) system to direct laser energy during laser processing of additive materials deposited in a melt pool on the base material. The LMD system includes a laser energy source configured to direct laser energy towards the base material and inoculation materials to form the melt pool thereon and to process the deposited additive materials and inoculation materials to form layers on the base material upon solidification.

The invention discloses a laser metal deposition preparation method for a boss structure of an engine diffuser casing, which comprises the following steps of: outputting a process argument report through early-stage process verification; designing a positioning tool, and designing and manufacturing an anti-deformation follow-up tool; adding allowance to the size of the boss, and simulating the scanning path and reliability of the boss by software to obtain a scanning path program; before preparation, the parts, the shape follow-up tool and the positioning tool need to be assembled and installed, and the atmosphere of inert gas in the preparation process is created by adopting a flexible high-temperature-resistant film; carrying out boss laser metal deposition preparation according to the verified program, and after the temperature of the boss and the surface of the part is reduced, stopping filling the inert gas; putting the tool and the part into a vacuum heat treatment furnace; detecting the prepared boss, and if not, repairing the prepared boss; performing size comparison on the optical three-dimensional scanning model before and after the boss is prepared, wherein a result is a deviation measured value; and the prepared boss is machined. The invention provides a complete set of mature laser metal deposition preparation method for a boss structure of a case of an engine diffuser.

A system for manufacturing of a sintered wire and in-situ feeding to a laser wire welding system is presented. The system includes a pressure vessel connected to a powder feed system for delivering at least two powders to a powder mixing zone of the pressure vessel. The at least two powders are mixed via a rotating cone in the pressure vessel. After mixing, a heating device contained within the pressure vessel heats the mixture so that liquid phase sintering occurs and a sintered rod is created. The sintered wire is continuously fed to a laser metal deposition system for depositing a layer of additive material on a base material. A method of additively manufacturing or repairing a superalloy component is also presented.