Die casting die is a method of casting liquid die forging, a process completed on a special die casting die forging machine. The basic technological process is that the liquid metal is first filled into the mold cavity by low-speed or high-speed casting, and the mold has a movable cavity surface. It is forged under pressure with the cooling process of the liquid metal, which not only eliminates the shrinkage porosity of the blank, but also makes the inner structure of the blank reach the forged broken grain. The comprehensive mechanical properties of the blank have been significantly improved.
The alloys used in die casting are mainly non-ferrous alloys. Ferrous metals (steel, iron, etc.) are seldom used because of mold materials and other problems. In the nonferrous alloy die castings, aluminum alloys are widely used, followed by zinc alloys. The following is a brief introduction to the situation of die casting nonferrous metals.
(1) The classification of non-ferrous die-casting alloys is hindered shrinkage mixed shrinkage free shrinkage lead alloys - - - 0.2-0.3-0.4% 0.4-0.5% low melting point tin alloy zinc alloys - - - 0.3-0.4-0.4% 0.6% 0.6-0.8% Al-Si alloys - - - 0.3-0.5% 0.7% 0.7-0.9% die-cast non-ferrous aluminum alloy Al-Cu alloys - - - 0.5-0.7-0.9% Al-Mg alloys -1.1% high melting point alloy Al Zn series magnesium alloy ----------0.5-0.7% 0.7-0.9% 0.9-1.1% Cu alloy
(2) Various kinds of casting temperature alloys recommended by die casting alloys The average wall thickness of castings less than 3 mm is greater than 3 mm. The structure is simple, the structure is complex, the structure is simple and the structure is complex.
Al Si alloy is 610-650 C, 640-680 C, 600-620 C, 610-650 C.
Al Cu is 630-660 C, 660-700 C, 600-640 C, 630-660 C.
Al Mg is 640-680 C, 660-700 C, 640-670 C, 650-690 C.
Al Zn is 590-620 C, 620-660 C, 580-620 C, 600-650 C.
Zinc alloy at 420-440 C, 430-450 C, 400-420 C, 420-440 C
Magnesium alloy at 640-680 C, 660-700 C, 640-670 C, 650-690 C.
Copper alloy ordinary brass at 910-930 C 940-980 C 900-930 C 900-950 C
Silicon brass at 900-920 C, 930-970 C, 910-940 C, 910-940 C
* Note: (1) casting temperature is generally measured by the temperature of the molten metal in the holding furnace.
2. The casting temperature of zinc alloy should not exceed 450 degrees, so as to avoid coarse grain.
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