High-pressure hub casting mold and casting method thereof

Abstract

The invention provides a high-pressure hub casting mold. The high-pressure hub casting mold comprises an upper mold body, a side mold body, a bottom mold body and a gas pressurization system, whereinthe upper mold body, the side mold body and the bottom mold body form a casting cavity for a hub to be cast after being assembled; the center of the upper mold body is connected with a liquid storagehopper; a metal liquid storage chamber communicating with the casting cavity is formed in the liquid storage hopper; the gas pressurization system is connected with the liquid storage hopper through aventilation pipe and communicates with the metal liquid storage chamber; the side mold body is provided with a runner, and a pouring gate is arranged at the outer end of the runner; and after metal liquid is poured into the casting cavity, the gas pressurization system is used for applying high pressure to the metal liquid in the metal liquid storage chamber, and the metal liquid in the metal liquid storage chamber carries out feeding on a hub casting in the casting cavity under the high pressure applied by the gas pressurization system. The high-pressure hub casting mold further comprises aheating system, a cooling system and a demolding system used for demolding the formed hub casting. According to the high-pressure hub casting mold, a working allowance is reserved for the casting, thedeformation amount of the casting is reduced, the production efficiency is improved, and the rejection rate is low.

Description

technical field [0001] The invention relates to the technical field of hub casting, in particular to a high-pressure hub casting mold and a casting method thereof. Background technique [0002] The wheel hub is an important part of the car, and the quality of the wheel hub blank has a great influence on the quality of the wheel hub; at present, gravity casting and low pressure casting are widely used, but there are the following defects: [0003] 1) During the gravity casting process, gas will be generated inside the aluminum alloy liquid. The gas is difficult to discharge due to the high viscosity of the molten metal used for casting the wheel hub. A large amount of gas is trapped inside the casting, forming pores; Crystallization and solidification under pressure state, feeding is difficult, and coarse grains and uneven crystal phase structure are prone to occur at hot nodes; the casting structure is loose or shrinkage, and pinholes, pores, oxidized slag inclusions, hot cr...

AI Technical Summary

Problems solved by technology

[0003] 1) During the gravity casting process, gas will be generated inside the aluminum alloy liquid. The gas is difficult to discharge due to the high viscosity of the molten metal used for casting the wheel hub. A large amount of gas is trapped inside the casting, forming pores; Crystallization and solidification under pressure state, feeding is difficult, and coarse grains and uneven crystal phase structure are prone to occur at hot nodes; the casting structure is loose or shrinkage, and pinholes, pores, oxidized slag inclusions, hot cracks, and pinholes are prone to occur. Defects such as porosity seriously affect the airtightness and mechanical properties of the product, reducing the yield of the product, and the produced product is difficult to apply to occasions that require high product quality

Moreover, gravity casting needs to set risers on the mold, which makes the machining allowance of the wheel hub casting large, affects the production efficiency of the wheel hub, and also reduces the effective utilization rate of the molten metal

[0004] 2) Low-pressure casting forms crystals and solidifies under relatively low pressure, and the general applicable production pressure is only 0.9-1.2KGF / ㎝ 2 , while increasing the pressure, there will be potential safety hazards such as cracking of the riser pipe and explosion of the furnace body

Under the limitation of low pressure, the feeding during crystallization and solidification is insufficient, and the cast products have defects such as loose structure, pinholes, slag holes, and pores.

[0005] Therefore, the casting methods based on gravity casting and low-pressure casting are difficult to form high-quality wheel hubs. The wheel hub castings formed by gravity casting and low-pressure casting cannot make full use of the molten metal to form the wheel hub. The machining allowance is large, resulting in low production and processing efficiency of the wheel hub

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