Method for making core with aeration ossification

Abstract

The invention discloses a core making method by gas-blowing hardening, which is characterized in that the mass percentage of mixing materials of the making core sand is as follows: 0.9-7.0 percent of soluble glass, 0.1-1.0 percent of moisture absorption resistant agent and raw sand for the rest; the used moisture absorption resistant agent can be triacetyl glycerine, diacetin, glycerol mono acetate bulk, diethylene glycol acetic ester, propylene glycol acetic ester, other polylol organic acid ester or the mixture thereof; the volume percentage of the blowing gas for hardening is as follows: 25-100 percent of C2-C4 organic ester and 0-75 percent of C1-C2 alcohols. The method of the invention has no toxicity and odor in production process, and the produced cores have better stripping strength.

Description

technical field [0001] The invention relates to casting technology, and in particular provides a method for preparing sand cores through air blow hardening. Background technique [0002] The binder used in casting production and its core-making process are directly related to the quality of castings, casting productivity, labor environment, production cost and impact on the ecological environment. In the past, the foundry used the clay sand drying method to make cores. Later, vegetable oil and synthetic lipid thermosetting substances were used as sand core binders. The sand cores were compacted by hand, and the working conditions were harsh. It takes hours to harden, high energy consumption, long production cycle, easy deformation of the sand core, high breakage rate during handling, and affects the quality of castings. After World War II, the technology of shell core and hot core box was promoted. The shell core and hot core box used thermosetting synthetic resin as the bi...

AI Technical Summary

Problems solved by technology

[0003] The disadvantage of this process is: the binder contains nitrogen, and the application of alloy castings sensitive to nitrogen pores is limited

However, the above two inventions have low mold strength, and in wet weather, the sand core strength loss is large, which affects its popularization and application, and needs to be further improved.

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