CITIC Dicastal Co., Ltd.

Provided is a method for evaluating the stability of the cooling effect of a cooling system for low-pressure casting of an aluminum alloy wheel hub, relating to the technical field of low-pressure casting of automobile wheel hubs. The method includes: selecting a mold object; arranging a thermocouple, and acquiring temperature data; changing an initial temperature at a temperature measuring point of the thermocouple, and further acquiring real-time temperature data; extracting characteristic temperature data, and performing linear regression between an initial temperature value and a characteristic temperature value; and performing temperature data fluctuation analysis, and quantitatively measuring the stability of the cooling effect of the cooling system by using a maximum value and a minimum value of deviation of discrete points from a fitting curve as indexes.

A multi-process parameter optimization method for low-pressure casting of aluminum alloy wheel hubs is disclosed, relating to the technical field of low-pressure casting of automobile wheel hubs. The method includes: building a three-dimensional model of an aluminum alloy wheel hub; setting initial production process parameters; numerically simulating a low-pressure casting process; analyzing temperature distribution in key points of a mold; adjusting the production process parameters based on temperature distribution; repeating the above steps to further optimize the production process parameters and obtain an optimal combination of process parameters; collecting and analyzing actual production data and building a model; and optimizing the process parameters by using a dynamic multi-objective particle swarm.

The present disclosure provides an intelligent temperature control method for a casting system, including: obtaining feature regions of a casting mold and arranging thermocouples in the feature regions of the mold based on structural characteristics of castings; building a random forest model and performing recursive feature elimination based on temperature measurement results of the thermocouples and casting quality inspection results, to determine a correlation between temperature measurement data of each thermocouple and casting quality, thereby optimizing a quantity of the thermocouples and screening the thermocouples; and analyzing temperature data of screened thermocouple temperature measurement points, cooling process parameters, and corresponding casting quality, constructing a relation among the cooling process parameters, an initial temperature of each thermocouple in the mold, and the casting quality through a gradient boosting decision tree model, and controlling the temperature of the casting system based on the relation.

The invention provides a surface treatment method for a magnesium alloy hub. The process includes: cleaning a to-be-treated surface of the magnesium alloy hub; blackening the cleaned to-be-treated surface; and laser cladding the blackened to-be-treated surface, wherein a laser cladding mode is a synchronous powder feeding mode, and a coating material is chromium. According to the surface treatment method for the magnesium alloy hub, air holes can be avoided.

An additive repair welding method for a hot-working mold includes: placing the hot-working mold in a heating holding furnace, performing heating to 420-450° C. along with the heating holding furnace, stopping performing heating, performing heat preservation for a predetermined time such that the surface temperature of an upper mold is not less than 200° C. after discharging from the furnace and before welding, while preheating a welding wire to a first predetermined temperature; gripping the hot-working mold by using a mechanical gripper to be placed on a clamping tooling, driving clamping jaws by a tooling cylinder to be automatically centered for clamping, starting a welding robot for welding until completion; opening the clamping tooling, sending the hot-working mold back to the heating holding furnace by using the mechanical gripper to be heated again to a second predetermined temperature, stopping performing heating, performing slow cooling to room temperature along with the furnace temperature.

The present invention discloses a low-pressure mold and production process for aluminum alloy integrated brake calipers, relating to the technical field of casting. The mold comprises a bottom plate, a right mold core and a left mold core are provided on the bottom plate, and the right mold core and the left mold core have the same internal structure and are each provided with a sprue assembly. The low-pressure casting process has higher production efficiency and yield than gravity casting. Castings produced by low-pressure casting have higher structural compactness and more excellent mechanical properties than those produced by gravity casting.

A hub image retrieval method and a device thereof for improving the retrieval accuracy of an image containing a hub. The method includes: performing feature extraction on a hub image to be processed containing a target hub, and obtaining a hub feature to be processed containing N sub-hub features, wherein the N sub-hub features at least include information characterizing the features of a hub window of the target hub; determining similarities between candidate hub features of each candidate hub image and the hub features to be processed; and selecting a candidate hub image matching the hub image to be processed from the plurality of candidate hub images based on the determined respective similarities.

A multi-color application method and device for an aluminum alloy wheel. The method is used for preparing a wear-resistant ceramic layer on a surface of the aluminum alloy wheel by using a plasma coating (PLMC) system, includes the steps of: pretreating the wheel, spraying an insulating powder coating, curing an insulating powder coating, making a multi-color pattern, cleaning the multi-color pattern, forming a PLMC, performing blocking, performing water washing, drying the PLMC, forming a transparent powder coating, curing a transparent powder coating, forming the PLMC includes preparation of a ceramic film at a multi-color application position, an electrolyte is a phosphate-silicate system, and the PLMC system is provided with: a power supply, a mechanical arm and a plurality of oxidation tanks, the mechanical arm plays a supporting role in wheel transportation and an oxidation process; and the oxidation tanks are used to prepare the PLMC with different colors in the electrolyte.

Disclosed are a corrosion-resistant film for a magnesium alloy wheel and a preparation method thereof, The corrosion-resistant film for a magnesium alloy wheel includes: a micro-arc oxidation (MAO) coating, a chemically blocked coating, a physical vapor deposition (PVD) high-density inorganic hybrid coating, a high oxidation-resistant powder coating which are sequentially stacked from inside to outside by using the magnesium alloy wheel as a substrate. In the present disclosure, based on a micro-arc oxidation technology, zirconium, titanium, an iron salt, nano silicon, polymer resin are added into an electrolytic solution, and under a constant voltage mode of an adjustable power supply, the MAO coating is generated on the surface of the magnesium alloy wheel, followed by chemical blocking; the PVD high-density inorganic hybrid coating is obtained by coating on the chemically blocked coating, physical blocking is performed; the high oxidation-resistant powder coating is spray-coated on the PVD high-density inorganic hybrid coating.

The present invention discloses a flexible adaptive high-precision mold. A die-casting machine table plate is externally connected to a die-casting machine, a mold release plate is mounted at a middle portion of the die-casting machine table plate through a hydraulic mechanism, adapter plates are mounted on two sides of a bottom surface of the die-casting machine table plate, a connecting plate is suspended and connected to each adapter plate, positioning columns are mounted at four corners of the bottom plate, an ejection rod plate is connected to a mold release ring through connecting columns, the connecting columns are slidably connected to a top mold, the mold release ring matches side molds, a mold cavity for forming workpieces is formed through the bottom mold, the top mold and the side molds, and return columns are mounted on four sides of the ejection rod plate.