Split type ceramic shell assembly and molding process for precision casting

Abstract

The invention discloses a split type ceramic shell assembly and molding process for precision casting. The process comprises the steps that (1) two or more independent half bodies of ceramic shells are designed and manufactured; the two corresponding half bodies of the ceramic shells are provided with mutually matching seam allowance joints, and the seam allowance joints are matched with each other in a concave and convex mode; adhesive paste is confected; and reinforce paste is confected; (2) the seam allowance joints, matched with each other in a concave and convex mode, of the two corresponding half bodies of the ceramic shells are bonded by the adhesive paste; (3) binding site of the two corresponding half bodies of the ceramic shells is bonded by the reinforce paste and is reinforcedby two times; and (4) the ceramic shell is assembled in a while and is roasted at high temperature, and the complete ceramic shell which meets the technical requirements of precision casting is obtained. The high strength and complete ceramic shell is obtained, alloy liquid during the pouring process is not polluted, and the whole molding and assembly process is simple, easy, efficient, economicaland practical.

Description

technical field [0001] The present invention relates to the molding technology of ceramic mold shells for precision casting, in particular to a molding process for assembling split ceramic mold shells for precision casting into a whole, which is especially suitable for precision casting molding of large and / or complex structure castings, and especially It is suitable for precision casting molding of batch castings. Background technique [0002] In the process of precision casting for large and / or complex structural castings, in order to achieve effective control of the solidification sequence and feeding of superalloys, the gating system part is often large and complex, and there are even multi-point distributed dark risers and other process measures. In this kind of investment casting process design, if the gating system and the casting body are integrally molded and shell-made, there will be the following main technical problems: [0003] 1. The overall mold assembly put...

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Problems solved by technology

[0004] 2. The different parts of the complex module produced by the overall molding will have serious mutual interference during the shell making process, which will lead to the deterioration of the quality of the ceramic mold shell made, and the wall thickness of different parts is very different. There is even a risk of steel breakout when pouring molten alloy;

[0005] 3. During the dewaxing process of the ceramic formwork with modules, the large and complex gating system partly melts and dewaxes for a longer time, which increases the risk of cracking of the ceramic formwork of the casting body, and sometimes even bursts directly

[0007] However, the ceramic formwork used for precision casting must not only have sufficient structural strength, but also must not pollute the alloy liquid during the pouring process. In addition, it must simplify the technical process as much as possible, reduce the cost of materials, and these technical requirements are from another One aspect increases the difficulty of forming ceramic mold shells for large and / or complex structural castings

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