A Method of Inhibiting Hot Cracking of Castings
A technology of hot cracking and casting, applied in the direction of mold, mold composition, manufacturing tools, etc., can solve problems such as easy hot cracking, and achieve the effect of high reliability, flexible method, and avoidance of substantial decline.
Active Publication Date: 2019-11-22
TSINGHUA UNIV
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Problems solved by technology
[0003] In order to solve the above-mentioned existing technical problems, the object of the present invention is to provide a method for suppressing thermal cracking of castings to solve the problem of easy thermal cracking of castings in investment casting, especially titanium-aluminum alloy castings, which has the advantages of simple operation and flexible method , high reliability and other characteristics
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[0022] Embodiments of the method for suppressing hot cracking of castings according to the present invention will be described below with reference to the accompanying drawings. Those skilled in the art would recognize that the described embodiments can be modified in various ways or combinations thereof without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims. Also, in this specification, the drawings are not drawn to scale, and like reference numerals denote like parts.
[0023] A method of suppressing hot cracking of castings, the following steps are used to obtain the mold shell for casting castings:
[0024] preparing an aqueous solution containing alkaline hydroxide;
[0025] Use an aqueous solution containing alkaline hydroxide to partially impregnate the part of the second shell corresponding to the part of the casting that is prone to thermal c...
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The invention provides a method for restraining thermal cracking of a casting. A shell used for casting the casting is obtained through the following steps that an aqueous solution containing alkali hydroxide is prepared; the position, corresponding to the portion prone to hot cracks of the casting, is locally soaked in the aqueous solution containing alkali hydroxide; and the shell is roasted, sothat the shell locally containing alkali hydroxide is obtained. According to the method for restraining thermal cracking of the casting, operation is simple and flexible, and the reliability is high;and by adjusting the solute elements, concentration and total impregnation quantity of the impregnation liquid and controlling the content of the alkali hydroxide in the shell, generation of a glassphase of the shell under a high temperature is improved, the deformability of the shell is effectively improved, and thermal cracking of metal is restrained.
Description
technical field [0001] The invention relates to the technical field of machinery, in particular to a method for suppressing thermal cracking of castings. Background technique [0002] Investment casting is to use wax to make a wax mold of the part to be cast, and then coat the wax mold with mud to form a mud mold, and leave a sprue when making the mud mold. After the clay mold dries, it is placed in hot water to melt the inner wax mold. Take out the clay mold that has melted the wax mold and bake it into a pottery mold. Then pour molten metal from the sprue for casting. Hot cracking of castings is one of the most common casting defects in investment casting, especially for titanium-aluminum alloys used in the aerospace field, where the hot cracking tendency is very obvious. Hot cracking is mainly caused by alloy properties and mold resistance. At present, the occurrence of hot cracking is suppressed by improving the casting structure and changing the alloy composition, bu...
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IPC IPC(8): B22C9/12B22C3/00
CPCB22C3/00B22C9/12
Inventor 吕志刚魏亚蒙胡可辉李欣怡
Owner TSINGHUA UNIV