Method for improving quality of sand core

Abstract

The invention discloses a method for improving the quality of a sand core. When the core is produced in a core box with a narrow and complex curved surface cavity inside and an exhaust plunger or an ejector core rod are not suitable for exhausting, the method of linear incision is used in the design and manufacture process of the core box and these narrow location of the core box is handled so that a linear incision exhaust groove is formed that communicates with the inner and outer portion of the core box cavity. By means of the linear incision in the process of core box design and manufacturing and handling these narrow positions, the advantage of adopting the linear incision machine lies that the diameter of molybdenum wire can be selected as 0.14 to 0.16mm and the diameter of the coated sand needed to be selected less than that of the molybdenum wire so that gas instead of sand can be allowed to pass, the purpose of guiding the flow of gas can be achieved and the quality of the sand core can be ensured .

Description

technical field [0001] The invention belongs to the technical field of core box design and manufacture, and in particular relates to a method for improving the quality of sand cores. Background technique [0002] Due to the different complexity of the parts produced by our company, the core boxes are also various. Especially for the core box with a very complex shape, there are many exhaust dead angles, which lead to defects such as insufficient sand filling, lack of meat, and insufficient strength of the core. In order to avoid the above defects and improve the quality of the core, we consider artificially guiding the direction of the gas, so that the gas catalyst is evenly distributed in the entire core box, so that the sand core is uniformly solidified, thereby improving the strength of the core and improving the qualification of the sand core rate and core-making efficiency. [0003] When making cores, the core box needs to reduce the pressure in the cavity through the...

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to overcome the defects of the prior art and provide a method for improving the quality of sand cores. When the core box is making cores, when the inside of the core box cavity has a complex curved surface and a small cavity, it is not suitable to use a vent plug or a top. In the case of core rod exhaust, wire cutting is used in the core box design and production process to process these narrow positions of the core box to form a wire cutting exhaust groove connecting the inside and outside of the core box cavity

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