Provided are: an aluminum alloy for die casting, having castability and mechanical properties equivalent to those of ADC12 and corrosion resistance equivalent to that of ADC6; and an aluminum alloy die cast obtained through die-casting the alloy. Specifically, the present invention is directed to an aluminum alloy for die casting that contains: Cu by not more than 0.10 wt %; Si by 12.0 to 15.0 wt %; Mg by not more than 1.00 wt %; Fe by 0.05 to 1.00 wt %; Cr by 0.10 to 0.50 wt %; and a remaining portion thereof being Al and unavoidable impurities.

An exhausting device of a low-pressure aluminum alloy wheel casting mold, which includes a control mainframe, a connecting line, a gas storage station, a ventilating pipeline, gas inlet plugs, an exhausting plug and the like, the control mainframe is connected with the gas storage station through the connecting line, and the gas storage station is connected with the gas inlet plugs through the ventilating pipeline; the gas inlet plugs are arranged at the bottom mold window; the mold filling process of the high-temperature molten aluminum can be completed in a relatively oxygen-free environment, direct contact between the molten aluminum and oxygen is avoided, and the occurrence probability of the oxidation slag inclusion defect in the wheel casting process is effectively controlled, so that the internal quality of the casting is remarkably improved.

A process for the manufacture of metal products includes the steps of providing a mold including a first portion made of an aggregate and a binder, delivering a molten metal into the mold, removing a first portion of the mold with a fluid and solidifying at least one targeted portion of the molten metal which will form the metal product with the fluid. A flow of fluid to the mold is stopped for a period of time. Subsequently, a remaining portion of the molten metal is solidified to form the metal product. The at least one targeted portion of the metal product has better mechanical properties than does a remaining portion of the metal product. A unitary, one-piece aluminum alloy component with differing mechanical properties is also disclosed.

Disclosed are an aluminum alloy composition for die casting and a method of heat treating the same. The aluminum alloy composition contains precipitation of an Mg—Zn-based strengthening phase through heat treatment to thus enhance strength thereof.

A method for manufacturing a cylinder block for a vehicle integrates a cylinder liner with the cylinder block. The method includes steps of: preparing a molded material having a cylinder liner shape; fixing the prepared molded material to an inside of a mold for the cylinder block; and casting the cylinder block integrated with the molded material by injecting casting molten metal for the cylinder block into the mold for the cylinder block to which the molded material is fixed.

A hypereutectic aluminum silicon high pressure die cast alloys is disclosed herein having 16% to 23% by weight silicon, 0.01% to 1.5% by weight iron, 0.01% to 0.6% by weight manganese, 0.01% to 1.3% by weight magnesium, 0.05% to 0.20% by weight strontium and the balance aluminum. The iron constituency may me modified to 0.01% to 0.7% by weight iron, or 0.01% to 0.2% by weight iron. The manganese constituency may be modified to 0.01% to 0.5% by weight manganese. The strontium constituency may be modified to 0.05% to 0.1% by weight strontium. The exhibits an elongation of at least 2%, an average ultimate tensile strength of greater than 250 MPa, and yield strength of greater than 200 MPa. The microstructure has a volume fraction of primary silicon at greater than 10% and a volume fraction of modified aluminum-silicon eutectic at 45% to 90%.

An alloy modifying agent for use in preparing a metal semisolid slurry, where the components and mass ratio thereof is silicon:iron:copper:manganese:magnesium:zinc:titanium:lead:aluminum having a mass ratio of (6.05-6.95):(0.15-0.45):(0.12-0.65):(0.002-0.006):(0.001-0.5):(0.025-0.05):(0.0 02-0.08):(0.002-0.06):(90.5-93.2). Also, a method for preparing the alloy modifying agent and a method for using the alloy modifying agent. The alloy modifying agent is capable of increasing the solid-liquid ratio and the spherical crystal content of the semisolid slurry, increasing the preparation efficiency of the semisolid slurry and the quality of the slurry, and ensuring the quality of a final die casting product.

A die-casting process method for die-cast molding of a metal in a semi-solid state, wherein a semi-solid state die-casting machine is used as a processing device and a pulper is used as a device for preparing and delivering a slurry in a semi-solid state; the method comprises the steps: spraying a mold release agent and mold clamping; melting the raw material and keeping the temperature; adding a metal modificator into the molten raw material to prepare the slurry in a semi-solid state; transferring the slurry in a semi-solid state into a mold by the pulper; die-casting, opening the mold and exporting a die-cast; removing the sprue to obtain the final die-cast. In the process method, a metal modificator is added to the liquid metal raw material during the preparation of the slurry in a semi-solid state so as to generate more crystal nuclei, so that die-cast products have better mechanical properties; by way of die-casting the slurry in a semi-solid state, during mold stripping the die-cast is low in temperature and small in deformation quantity, and the best shapes and surface smoothness of the product can be guaranteed; and the die-cast is compact interiorly with producing air holes, and the best interior structure and mechanical properties of the die-cast product are guaranteed.

Methods and apparatus for a composite bicycle front sprocket are disclosed herein. One embodiment discloses a composite bicycle front sprocket assembly having an outer assembly of a first material. The bicycle front sprocket assembly also has a center assembly of a second material. The center assembly is disposed at least partially within the outer assembly. The center assembly is irremovably coupled with the outer assembly. The center assembly is irremovably coupled with the outer assembly without an external fastening device to irremovably couple the center assembly with the outer assembly.

A variable stiffness device, including a core including a low melting point alloy, an encapsulation surrounding the core, the encapsulation made of an elastic material and sealing the core, and a heating device arranged around the encapsulation, configured to heat the core, wherein the elastic material of the encapsulation is subject to a tensile stress in a direction along a longitudinal extension of the thread-like variable stiffness device.