Sand core with specific exhaust structure, and preparation method thereof

Abstract

The invention discloses a sand core with a specific exhaust structure. The sand core with the specific exhaust structure comprises a metal wire framework, a high-temperature-resistant exhaust fiber pipe and a sand layer. The high-temperature-resistant exhaust fiber pipe sleeves on the periphery of the metal wire framework; a pipe wall of the high-temperature-resistant exhaust fiber pipe has breathability; and the sand layer is cured to coat on the periphery of the high-temperature-resistant exhaust fiber pipe. A preparation method of the sand core comprises the steps of forming the metal wireframework; assembling the high-temperature-resistant exhaust fiber pipe; and forming the sand core. According to the sand core with the specific exhaust structure and the preparation method thereof provided by the invention, an exhaust effect of the sand core is improved, the defect caused by a reaction gas on a casting piece is reduced, the quality and the acceptability of the casting piece is remarkably improved, and the production cost is effectively reduced. The high-temperature-resistant exhaust fiber pipe is adopted, and the pipe wall of the high-temperature-resistant exhaust fiber pipehas breathability, so that the exhaust effect is more remarkable, and a high-temperature-resistant performance meets a working environment requirement. The metal wire framework can shape and support the high-temperature-resistant exhaust fiber pipe, so that integral type pre-embedding is realized. The preparation method of the sand core is simple, easy to operate, and suitable for popularization and application.

Description

Technical field [0001] The invention relates to a sand core, in particular to a sand core with a specific exhaust structure and a preparation method thereof, and belongs to the technical field of sand cores and preparation methods thereof. Background technique [0002] With the development of modern industry, the structure of castings is becoming more and more complex. For the transmission system shell castings containing a large number of complex cavities and oil circuits, the quality of the sand core exhaust in the mold will directly affect the quality and pass rate of the castings. In actual production, when the casting molten metal fills the sand mold cavity, the oil passage of the casting only has outlets at the front and rear ends of the sand core, and at the same time, it is exhausted by these two outlets. At present, a hand electric drill is used to manually drill the sand core to form the exhaust channel. If the length of the entire sand core is too long, it is very dif...

AI Technical Summary

Problems solved by technology

[0005] The present invention solves the deficiencies of the above prior art and the traditional sand core exhaust structure is complicated and unstable, and provides a sand core with a specific exhaust structure and its preparation method

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