Casting system and preparation method of aluminum matrix composite material casting
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An aluminum-based composite material and temperature control system technology, which is applied in the field of composite material preparation, can solve the problems of incomplete forming and poor fluidity, and achieve the effects of good forming, good wear resistance, and improved feeding effect
Active Publication Date: 2021-05-14
LOUDI WENCHANG TECH
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[0004] The main purpose of the present invention is to provide a casting system and a method for preparing aluminum-based composite material castings. The casting system can adjust different parts of the mold by adjusting the thickness of the insulation layer at different positions by designing the temperature control system, especially the design of the heat preservation mechanism. The temperature can be controlled to control the heat preservation effect of different parts of the mold, and the desired temperature gradient can be obtained, so as to precisely control the solidification temperature during melt molding, and can obtain castings with complete filling, high density and excellent performance, so as to solve the existing problems. The technical problem of incomplete forming of aluminum-based composite materials due to poor fluidity during the filling process in the technology
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Embodiment 1
[0065] Prepare 20% SiC / AHS-2 composite material casting, the middle layer is 3cm insulation cotton.
[0066] First, turn on the heaters at the gate and riser, and raise the temperature of the mold to 400°C to heat the melt and avoid the melt from clogging at the gate during filling;
[0067] After heating up, turn on the cooling water system of the lower mold, and pour the smelted 700°C composite material melt into the cavity, and stop casting when the melt starts to flow out from the riser;
[0068] Start the motor, put the gate indenter and riser indenter into the gate and riser respectively, and set the pressure to 0.8MPa, keep the pressure for 5 minutes to promote feeding;
[0069] The upper mold and the lower mold are opened to obtain a 20% SiC / AHS-2 composite material casting.
Embodiment 2
[0071] A 40% SiC / AHS-2 composite material casting was prepared, and the middle layer was 2cm insulation cotton.
[0072] First, turn on the heaters at the gate and riser, and raise the temperature of the mold to 500°C to avoid blockage at the gate during filling;
[0073] After heating up, turn on the cooling water system of the lower mold, and pour the smelted 700°C composite material melt into the cavity, and stop casting when the melt starts to flow out from the riser;
[0074] Start the motor, place the gate indenter and riser indenter into the gate and riser respectively, and set the pressure to 0.5MPa, and keep the pressure for 10 minutes to promote feeding;
[0075] The upper mold and the lower mold are opened to obtain a 40% SiC / AHS-2 composite material casting.
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Abstract
The invention provides a casting system and a preparation method of an aluminum matrix composite material casting. The casting system comprises a mold, a pouring gate system and a temperature control system, wherein the mold comprises an upper mold and a lower mold which are matched with each other; the upper mold is provided with multiple feed heads which are respectively communicated with a cavity; the pouring gate system comprises a pouring gate, a straight runner communicated with the pouring gate, and a transverse runner communicated with the straight runner and the cavity respectively; a heating mechanism in the temperature control system is at least arranged outside one of the pouring gate, the straight runner and the multiple feed heads; a heat preservation mechanism is at least arranged on the upper mold and one of side walls forming the pouring gate, the feed heads, a vertical channel and the transverse runner; the heat preservation mechanism is at least one heat preservation layer arranged on the heat preservation mechanism; and a cooling mechanism is used for rapidly cooling a melt at the bottom. According to the casting system, the heat preservation effects of different parts of the mold are controlled by adjusting the thicknesses of the heat preservation layers at different positions, so that the solidification temperature during melt forming is accurately regulated and controlled, and castings which are complete in mold filling, high in compactness and excellent in performance are obtained.
Description
technical field [0001] The invention relates to the technical field of composite material preparation, in particular to a casting system and a method for preparing aluminum-based composite material castings. Background technique [0002] Particle-reinforced aluminum matrix composites have many advantages such as specific strength, high specific stiffness, high wear resistance, and high vibration damping. Reinforcing particles can significantly improve the elastic modulus, yield strength, wear resistance and high temperature creep of the matrix while maintaining a low content, so it has gradually been paid attention to. Compared with liquid metal casting, due to the presence of reinforcing phases in the melt, aluminum-based composite materials have similar filling conditions to semi-solid casting, with smooth filling, dense internal structure of castings, fewer defects such as internal pores and segregation, and solidification shrinkage. Small size, forming the advantages of...
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