A kind of preparation method of physical metamorphic semi-solid die-casting of high thermal conductivity baking pan

Abstract

The invention relates to a physical modification semi-solid die casting preparing method for a high-heat-conductivity baking disc. The method comprises the steps that an aluminum alloy cast ingot is rapidly subjected to temperature rise, and the rest of aluminum alloy cast ingot is controlled to be at the low smelting temperature; overheating fusion aluminum liquid is poured into low-temperature fusion aluminum liquid to be subjected to modification treatment; an Al-5B alloy is added in aluminum liquid obtained after modification treatment, and heat preservation is conducted for 0.2-0.5 h; anAl-10Sr alloy is added in the aluminum liquid, and heat preservation is conducted for 0.2-0.5 h; the aluminum liquid is subjected to fine smelting, gas removal and slag removal; electromagnetic stirring is adopted for conducting high-speed stirring on the aluminum liquid obtained after slag removal, cooling is conducted to 620-640 DEG C during stirring, the stirring time is 30-40 min, the stirringspeed is 250-500 rpm, and semi-solid die casting liquid is obtained; the die casting liquid is transferred to a hydraulic die casting machine, and an aluminum alloy baking disc blank is obtained through die casting of a baking disc die; and after the aluminum alloy baking disc blank is polished, coating is conducted, and a high-heat-conductivity baking disc finished product is obtained. The manufacturing method for the baking disc obtained and prepared through the method is simple, the heat conduction effect is good, and the method is suitable for being popularized and used in the baking field.

Description

technical field [0001] The invention relates to a manufacturing process of a bakeware for an oven, in particular to a method for preparing a physically modified semi-solid die-casting of a high thermal conductivity bakeware. Background technique [0002] The oven has now become an indispensable household appliance in the family, and the food baked in the oven is delicious. There are many kinds of materials for the baking tray of the oven, the more common ones are stainless steel baking tray, aluminum baking tray, glass baking tray, other alloy baking trays, etc. Among them, the heat conduction effect of the steel baking tray is the worst, which makes it easy to burn during the baking process. The heating is uneven, and the aluminum alloy baking pan has become the best choice. In the field of aluminum alloy manufacturing, die-casting is currently the most important casting process. It has high production efficiency and high material utilization rate, and is suitable for larg...

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Problems solved by technology

In the prior art, there have been reports of changing the thermal conductivity by changing the silicon phase. By adding 0.02% boron and 0.03% strontium to undergo composite modification, the aluminum-silicon alloy is treated, and the Si phase changes from lamellar to fibrous. After 350 ℃ for four hours, the thermal conductivity of the alloy increased to about 179W / (m·K), but the above research only used the aluminum alloy ENAB-44200 as the raw material. When the aluminum alloy with ultra-high copper content was used, due to the latter The copper content between them is much higher than that of ENAB-44200, and the finished products obtained by die casting under the above conditions are prone to copper precipitation

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