摘要:
A stretchable adjustable-stiffness assembly includes a casing and first and second friction layers. The casing can be fluidly sealed and includes an interior compartment containing a fluid. The fluid can shift between a first interior pressure and a second interior pressure less than the first interior pressure and an exterior pressure. The first and second friction layers are disposed within the interior compartment. The assembly can shift between relaxed and fixed configurations. In the relaxed configuration, the fluid has the first interior pressure, the casing is stretchable between a first dimension and a second dimension greater than the first dimension, and the assembly has a first stiffness. In the fixed configuration, the first fluid has the second interior pressure, the casing length is fixed, the first and second friction layers are engaged, and the assembly has a second stiffness greater than the first stiffness.
摘要:
A brake rotor comprising a brake pad wear surface; a hat surface; and a decorative insert comprising an insert material, the decorative insert disposed on the brake pad wear surface, the hat surface, or both; wherein at least one of a friction coefficient between the decorative insert and a brake pad is substantially the same as a friction coefficient between the brake pad wear surface and the brake pad, a wear rate of the decorative insert is substantially the same as or greater than a wear rate of the brake pad wear surface, or a wear rate of the decorative insert is substantially the same as or greater than a wear rate of the hat surface; and at least a portion of the decorative insert is visible on the brake pad wear surface, the hat surface, or both.
摘要:
A high pressure die casting apparatus for forming metal components includes a die cast mold, a shot sleeve, and a plunger. The shot sleeve includes a pivotable pouring lid disposed in an inlet of the shot sleeve. The pouring lid is disposed in at least one of a closed position and an open position while having a pouring profile shape for promoting smooth non turbulent flow of liquid metal from a pouring ladle to the shot sleeve.
摘要:
A method of transferring molten metal to a die casting mold is disclosed. The method includes providing a ladle with a dip well and a dispensing nozzle having a fluid metal filter formed therein as well as providing a receptacle fluidly between the ladle and the mold. Further the method includes delivering the molten metal from the ladle to the receptacle by positioning an exit face of the dispensing nozzle over the receptacle and rotating the ladle such that the exit face of the dispensing nozzle is repositioned proximal the bottom of the receptacle and conveying the molten metal that has been delivered to the receptacle into a mold cavity that is placed in fluid communication therewith.
摘要:
A method of computationally determining material property changes for a cast aluminum alloy component. Accuracy of the determination is achieved by taking into consideration material property changes over the projected service life of the component. In one form, the method includes accepting time-dependent temperature data and using that data in conjunction with one or more constitutive relationships to quantify the impact of various temperature regimes or conditions on the properties of heat-treatable components and alloys. Finite element nodal analyses may be used as part of the method to map the calculated material properties on a nodal basis, while a viscoplastic model may be used to determine precipitation hardening and softening effects as a way to simulate the time and temperature dependencies of the material. The combined approach may be used to determine the material properties over the expected service life of a cast component made from such material.
摘要:
A method for applying a thermal barrier coating (TBC) to a surface of a cast component includes providing a core, applying the TBC to the core to form a coated core, disposing the coated core within a casting mold, casting metal around at least a portion of the coated core to form a casting intermediary, and removing the core from the casting intermediary to form a cast component. The TBC includes hollow microspheres comprising metal, glass, and/or ceramic materials. The hollow microspheres can have an average diameter of about 10 μm to about 100 μm. The component can be an automotive component, such as an engine intake assembly, an engine exhaust manifold, an engine block, and/or an engine cylinder head. The surface of the cast component can be one or more surfaces which define an engine intake passage, an engine exhaust passage, and an engine combustion chamber.
摘要:
A mold assembly for manufacturing a metal alloy casting includes a cope and drag mold, a plurality of sand cores and a pressure core. The cope mold includes an upper portion of a mold cavity. The drag mold includes a gating system, a lower portion of the mold cavity, and an upper portion of a plurality of riser cavities. The gating system is in communication with the riser cavities to provide pressurized liquid metal alloy to the riser cavities. The pressure core has a plurality of protrusions that are disposed in each of the upper portion of the plurality of riser cavities.
摘要:
A method of manufacturing a highly insulating three-dimensional (3D) structure is provided. The method includes depositing a first layer of hollow microspheres onto a base. The hollow microspheres have a metallic coating formed thereon. A laser beam is scanned over the hollow microspheres so as to sinter the metallic coating of the hollow microspheres at predetermined locations. At least one layer of the hollow microspheres is deposited onto the first layer. Scanning by the laser beam is repeated for each successive layer until a predetermined 3D structure is constructed. The 3D structure includes a composite thermal barrier coating (TBC), which may be applied to a surface of components within an internal combustion engine, and the like. The composite TBC is bonded to the components of the engine to provide low thermal conductivity and low heat capacity insulation that is sealed against combustion gasses.
摘要:
An occupant support structure and a method of customizing an occupant support structure. The occupant support structure may comprise a base and a reconfigurable cushion carried by the base. The reconfigurable cushion may include an occupant support surface and a bladder. The bladder may include an outer wall that defines an inner cavity underlying the occupant support surface and two or more overlapping material layers disposed within the cavity. The overlapping material layers may be adapted to selectively transition from a compliant state to a rigid state and vice versa by selective control of a pressure condition across the outer wall of the bladder to reconfigure or conform the occupant support surface of the cushion to a contour of a portion of an occupant supported by the cushion.
摘要:
A method of manufacturing a highly insulating three-dimensional (3D) structure is provided. The method includes depositing a first layer of hollow microspheres onto a base. The hollow microspheres have a metallic coating formed thereon. A laser beam is scanned over the hollow microspheres so as to sinter the metallic coating of the hollow microspheres at predetermined locations. At least one layer of the hollow microspheres is deposited onto the first layer. Scanning by the laser beam is repeated for each successive layer until a predetermined 3D structure is constructed. The 3D structure includes a composite thermal barrier coating (TBC), which may be applied to a surface of components within an internal combustion engine, and the like. The composite TBC is bonded to the components of the engine to provide low thermal conductivity and low heat capacity insulation that is sealed against combustion gasses.