Preparation method for precision cast mold shell and preparation method and application for precision cast casting
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A technology of precision casting and casting, which is applied in the preparation of precision casting castings and the preparation of precision casting shells. It can solve the problems of loose inner ring structure and achieve the effects of simple casting method, increased impact resistance and avoiding looseness.
Active Publication Date: 2019-04-12
CHINA HANGFA SOUTH IND CO LTD
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[0004] The invention provides a method for preparing a precision casting mold shell, a method for preparing a precision casting casting and its application, so as to solve the technical problems of deep and narrow blind cavity structure pouring breakout of complex integral castings and loosening of the thick and large inner ring structure
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preparation example Construction
[0031] like figure 1 and figure 2 As shown, the preparation method of the precision casting mold shell of this embodiment, the mold shell is prepared by a casting with an integrated structure of an oil chamber and an inner ring, including the following steps:
[0032] a. Prepare a load-bearing casing wax mold, and combine the wax mold with the sprue 3 to form a module tree;
[0033] b. Carry out at least two layers of casing on the surface of the module tree, and reserve blind cavity ports and inner ring openings;
[0034] c. Fill the plugging material into the blind cavity 1 of the load-bearing casing through the blind cavity port, seal the blind cavity port, and dry to form the blind cavity inner shell;
[0035] d. After the inner shell of the blind cavity is prepared, at least two layers of shells are made on the surface of the module tree, and the opening of the inner ring is reserved;
[0036] e. Fill the inner ring 2 with high cooling efficiency material through the ...
Embodiment
[0049] Preparation method of investment casting mold shell
[0050] a. Select the mold material, and make the mold material be pressed in a compressible state to form a wax mold with a certain strength, size and shape, and combine the wax mold with the sprue 3 to form a module tree;
[0051] b. Immerse the module tree in the paint, which includes 60% 325-mesh zircon powder and 40% silica sol, and a layer of refractory material is adhered to the surface of the formed coating. The material layer is formed into a hard shell, which is naturally dried to form a 1.5mm shell. Use compressed air to blow air at the blind cavity port and the opening of the inner ring to clean the refractory material floating on the surface. The formed shell is formed with a ball The head-shaped flexible tool is compacted into a 1mm shell; repeat the above operation until a three-layer shell is formed;
[0052] c. Mix 100g of ethyl silicate hydrolyzate paint with 40g of 100μm corundum sand components ev...
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Abstract
The invention discloses a preparation method for a precision cast mold shell and a preparation method and application for a precision cast casting. According to the preparation method for the precision cast mold shell, the mold shell is made of the casting with an integrated structure of an oil cavity and an inner ring, the preparation method for the precision cast mold shell comprises the following steps that a bearing casing wax mold is prepared, and the wax mold is combined with a pouring gate to form a mold set tree; at least two layers of shell making is performed on the surface of the mold set tree, and a blind cavity end mouth and an inner ring opening are reserved; slot blocking materials are filled into a blind cavity of a bearing casing through the blind cavity end mouth and theblind cavity end mouth is sealed, drying is performed, and a blind cavity inner mold shell is formed; after the blind cavity inner mold shell is prepared, the at least two layers of shell making is performed on the surface of the mold set tree again, and the inner ring opening is reserved; and high cooling effect materials are filled into the inner ring through the inner ring opening and the innerring opening is sealed, the drying is performed, at least one layer of shell making is performed on the surface of the mold set tree again, dewaxing and sintering are performed, and the mold shell isobtained. By means of the mold shell prepared by the preparation method for the precision cast mold shell, blind cavity pouring steel leakage can be solved, and the problem of thick and large inner ring loose can be improved.
Description
technical field [0001] The invention relates to the field of precision casting, in particular to a method for preparing a precision casting shell. In addition, the present invention also relates to a preparation method and application of an investment casting casting including the preparation method of the above investment casting shell. Background technique [0002] With the development of aero-engines, the structure of the overall parts is becoming more and more complex. From the traditional simple structure casting, forging, sheet metal stamping, reprocessing, assembly or welding to form complex structural parts, it has developed into the direct use of precision casting at this stage. Complex cavity structure. Due to the integration of various nozzles, mounting edges, oil pipes and other structures in this type of casing, there are many hot spots, which put forward higher requirements for the determination of casting feeding scheme and gating system design. [0003] At ...
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