Sand casting molding method for aircraft cabin door
A technology of sand casting and forming method, applied in the field of aluminum alloy casting and forming, can solve the problems of poor compactness of castings, high requirements for acceptance technical conditions, low pressure, etc., to achieve huge production cost advantages, ensure mechanical properties, crystalline grains fine effect
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Embodiment 1
[0054] The sand casting molding process of thin-walled aluminum alloy castings for aircraft cabin doors, the specific process is as follows:
[0055] 1) The alloy is prepared by using refined aluminum ingots, single crystal silicon, magnesium ingots, aluminum-titanium master alloys, aluminum-beryllium master alloys and hatch door castings. The chemical composition of the ingredients (according to the weight percentage, that is, wt%) is: Si: 6.9, Mg: 0.57, Ti: 0.12, Be: 0.048, impurity elements satisfy Fe<0.01, Mn<0.01, other impurity elements are each less than 0.05, and the sum is less than 0.15, and the remainder is Al.
[0056] 2) Prepare according to the usual resin sand casting process such as figure 1 , 2 No-bake resin sand cast exterior of hatch casting shown.
[0057] 3) Use a resistance furnace with a crucible capacity of 300kg to melt the alloy, melt the charge, adjust the composition, and wait for the temperature of the aluminum alloy solution to rise.
[0058] ...
Embodiment 2
[0075] The differential pressure casting molding process of thin-walled aluminum alloy castings such as hatches, the specific process is as follows:
[0076] 1) Furnace material selection, using high-purity aluminum ingots, pure silicon and other materials that can be purchased in the market to be added to the master alloy, the chemical composition of the returned furnace material should meet the acceptance requirements for the chemical composition of hatch door castings.
[0077] 2) Press Figure 7 The method shown is the method of making the inner core required for hatch casting, and the required appearance of the casting is made according to the normal sand casting method, and the necessary corner repairs and partial repairs are carried out after the mold is lifted. Evenly brush a layer of zirconium firefly powder paint on the surface of the mold and the inner core. It should be completely covered, uniform in thickness, free of flow marks and spots, and can be assembled aft...
Embodiment 3
[0090] The production process of the casting is the same as that of Example 1 except that the filling process parameters of the differential pressure casting are different from that of Example 1. In this embodiment, the filling process parameters of differential pressure casting are selected as follows: synchronous pressure at 350Kpa, liquid rising speed at 71mm / s, filling speed at 90mm / s, crust pressurization pressure at 15Kpa, and differential pressure filling by upper tank decompression method .
[0091] Obtain the mechanical properties of the casting attached casting sample:
[0092] Tensile strength Rm = 375 (Mpa), yield strength Rp0.2 = 315 (Mpa), elongation A = 8.5%.
[0093] The mechanical properties of 11 samples in the designated area of the casting body reached:
[0094] The average value of tensile strength Rm is 378 (Mpa), the minimum value is 365 (Mpa), and the maximum value is 385 (Mpa);
[0095] The average value of yield strength Rp0.2 is 323 (Mpa), the m...
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Abstract
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