Semi-solid rheo-extrusion casting technology and equipment of hypereutectic Al-Si alloy casting

Abstract

The invention provides a hypereutectic Al-Si alloy semi-solid rheological squeezing casting technique and a device, which pertains to a technical field of metal material semi-solid forming. The technique comprises the steps: alloy molten metal is smelted; hypereutectic Al-Si alloy semi-solid sizing agent is prepared by an electromagnetic stirring method; the sizing agent is cast into a holding furnace with a temperature of 610 DEG C-630 DEG C for storing; then a quantitative vacuum cup is utilized to cast the sizing agent into a mould which is preheated with a temperature of 150 DEG C-250 DEG C; the sizing agent is squeezing cast with a squeezing speed of 0.1mm / s-0.5mm / s, under moulding pressure of 50MPa-150MPa and with a pressure-keeping time of 10s-80s. The semi-solid continuous rheological squeezing casting of the hypereutectic Al-Si alloy products is realized, which improves the utilization ratio of the materials, reduces finishing allowance and reduces energy consumption but also refines granules of primary Si, refines and spheroidizes eutectic structure. The whole structure of a cast is compact with high-quality surface. The technique is simple and has short process, small investment of equipment, low cost and relatively strong practicability of the technique and the equipment.

Description

technical field

[0001] The invention relates to a semi-solid rheological extrusion casting process and device for a hypereutectic aluminum-silicon alloy casting, belonging to the technical field of semi-solid forming of metal materials. Background technique

[0002] The traditional production processes of hypereutectic aluminum-silicon alloy castings include: sand casting, metal casting, and pressure casting (including squeeze casting and high pressure casting). The shortcomings of these processes are: the grains of sand casting are coarse and the strength is poor; the gating system of metal casting is heavy, so the yield of castings is low; high pressure casting contains gas and cannot be heat treated. In addition, these traditional casting methods are all carried out at high temperature, and the general pouring temperature is more than 50°C above the alloy liquidus. The semi-solid forming process technology is between the liquidus-solidus temperature of the alloy, and it ...

Examples

Embodiment 1

[0030] (1) According to the conventional method, the mass ratio (wt.%) of the components is: 19% Si, 1.0% Cu, 0.4% Mg, 0.3% Mn, 0.5% Re, and the ZL117 alloy whose balance is Al is smelted into molten metal, and then Prepare hypereutectic aluminum-silicon alloy ZL117 semi-solid slurry with the electromagnetic stirrer shown in Figure 2, wherein the electromagnetic stirring current is controlled at 4-10A, and the slurry cooling rate is 4-10°C / s;

[0031] (2) Pour the semi-solid slurry obtained in the above steps into the holding furnace shown in Figure 3 for storage, control the holding temperature at 610-630°C, and store for 0min-15min;

[0032] (3) Preheat the extrusion casting mold of a cup-shaped casting of the prior art to 200~250 ℃, and spray release agent by conventional amount, release agent adopts FGW01-A commonly used in prior art, and add water 50 times diluted;

[0033] (4) Utilize the thermal insulation quantitative cup 3 in Fig. 1 to take semi-solid slurry from the...

Embodiment 2

[0035] (1) According to the conventional method, the composition mass ratio (wt.%) is: 22% Si, 2.0% Cu, 0.8% Mg, 0.5% Mn, 1.5% Re, and the ZL117 alloy that the balance is Al is smelted into molten metal, and then Prepare hypereutectic aluminum-silicon alloy ZL117 semi-solid slurry with the electromagnetic stirrer shown in Figure 2, wherein the electromagnetic stirring current is controlled at 20-30A, and the cooling rate of the slurry is 20-30°C / s;

[0036] (2) Pour the semi-solid slurry obtained in the above steps into the holding furnace shown in Figure 3 for storage, the holding temperature is 610°C-630°C, and the storage time is 0min-15min;

[0037] (3) Preheat the squeeze casting mold of an engine piston casting to 200-250°C, and spray a release agent in a conventional amount. The release agent is FGW01-A commonly used in the prior art, and diluted with water 150 times;

[0038] (4) Take the semi-solid slurry from the holding furnace by using the heat preservation quantit...

technical field

[0001] The invention relates to a semi-solid rheological extrusion casting process and device for a hypereutectic aluminum-silicon alloy casting, belonging to the technical field of semi-solid forming of metal materials. Background technique

[0002] The traditional production processes of hypereutectic aluminum-silicon alloy castings include: sand casting, metal casting, and pressure casting (including squeeze casting and high pressure casting). The shortcomings of these processes are: the grains of sand casting are coarse and the strength is poor; the gating system of metal casting is heavy, so the yield of castings is low; high pressure casting contains gas and cannot be heat treated. In addition, these traditional casting methods are all carried out at high temperature, and the general pouring temperature is more than 50°C above the alloy liquidus. The semi-solid forming process technology is between the liquidus-solidus temperature of the alloy, and it ...

Examples

Embodiment 1

[0030] (1) According to the conventional method, the mass ratio (wt.%) of the components is: 19% Si, 1.0% Cu, 0.4% Mg, 0.3% Mn, 0.5% Re, and the ZL117 alloy whose balance is Al is smelted into molten metal, and then Prepare hypereutectic aluminum-silicon alloy ZL117 semi-solid slurry with the electromagnetic stirrer shown in Figure 2, wherein the electromagnetic stirring current is controlled at 4-10A, and the slurry cooling rate is 4-10°C / s;

[0031] (2) Pour the semi-solid slurry obtained in the above steps into the holding furnace shown in Figure 3 for storage, control the holding temperature at 610-630°C, and store for 0min-15min;

[0032] (3) Preheat the extrusion casting mold of a cup-shaped casting of the prior art to 200~250 ℃, and spray release agent by conventional amount, release agent adopts FGW01-A commonly used in prior art, and add water 50 times diluted;

[0033] (4) Utilize the thermal insulation quantitative cup 3 in Fig. 1 to take semi-solid slurry from the...

Embodiment 2

[0035] (1) According to the conventional method, the composition mass ratio (wt.%) is: 22% Si, 2.0% Cu, 0.8% Mg, 0.5% Mn, 1.5% Re, and the ZL117 alloy that the balance is Al is smelted into molten metal, and then Prepare hypereutectic aluminum-silicon alloy ZL117 semi-solid slurry with the electromagnetic stirrer shown in Figure 2, wherein the electromagnetic stirring current is controlled at 20-30A, and the cooling rate of the slurry is 20-30°C / s;

[0036] (2) Pour the semi-solid slurry obtained in the above steps into the holding furnace shown in Figure 3 for storage, the holding temperature is 610°C-630°C, and the storage time is 0min-15min;

[0037] (3) Preheat the squeeze casting mold of an engine piston casting to 200-250°C, and spray a release agent in a conventional amount. The release agent is FGW01-A commonly used in the prior art, and diluted with water 150 times;

[0038] (4) Take the semi-solid slurry from the holding furnace by using the heat preservation quantit...

Images