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Draft the overall plan for the mold structure First of all, it is necessary to determine the position of aluminum alloy die castings in the mold, including the selection of parting surfaces, the number of cavities, and parting. Determine the pouring system and overflow drainage system, select the mold release method for die castings, consider the method and temporary sequence of mold opening, select and design the ejection mechanism, etc.: determine the structure and size of main parts and the required installation and coordination relationship, conduct the selection of mold base, the combined design of support and connecting parts, determine the cooling and heating method, and design the mold temperature adjustment system