Spraying-free and mould-cavity-venting-free tidal sand casting process and casting mould

Abstract

The invention discloses a spraying-free and mould-cavity-venting-free tidal sand casting process. The casting process comprises the following steps of (1), die fabrication, specifically, a die withoutcasting mould mould-cavity venting needles is fabricated; (2), configuration of tidal sand, specifically, new sand with the mesh number being 70-140 is taken to be uniformly mixed with used sand, a binder, an additive and water are added, and the tidal sand is fabricated; (3), casting mould fabrication, specifically, the die is adopted to fabricate the tidal sand into the casting mould without the mould-cavity venting needles; (4), mould assembling and pouring, specifically, the sand core of a casting is installed into the casting mould, mould assembling and pouring with molten iron are performed; (5), sand shakeout; (6) cleaning and obtaining of the casting. The invention further discloses the spraying-free and mould-cavity-venting-free tidal sand casting mould. By means of process and the casting mould provided by the invention, the wet breathability of the moulding sand can be lowered, and molten iron filling is stabilized.

Description

technical field [0001] The invention relates to a green sand casting process, in particular to a green sand casting process free of spraying and cavity exhaust. The invention also relates to a damp sand casting mold free from spraying and without cavity exhaust. Background technique [0002] With the continuous development of casting technology, the casting cost requirements continue to decline, and it is becoming more and more difficult to reduce the cost of the process. In order to maintain the quality requirements of the current products, it is necessary to make revolutionary changes to the traditional casting process and casting methods. . In the existing multi-moulding sand casting process, in order to reduce the probability of product sticking sand, the method of spraying paint is usually used on the mold to prevent mechanical sticking sand. However, the method of spraying paint to prevent mechanical sand sticking of castings also has a side effect. After the paint i...

AI Technical Summary

Problems solved by technology

However, when the mold is completely filled with molten iron, the molten iron will continue to fill the entire exhaust needle, thereby increasing the usage of molten iron and increasing production costs

[0005] 3. After the mold is made, spray a layer of paint on the surface of the mold, which can effectively prevent the mechanical sand sticking of the casting, but at the same time, it will greatly reduce the moisture permeability of the mold

[0006] 4. Using the method of drilling cavity vent holes to improve the venting of the mold will lead to low local air pressure of the mold, changing the flow velocity of the local molten iron, resulting in inconsistent flow velocity of the local molten iron, and turbulent flow of molten iron filling , molten iron is involved in gas, increasing the probability of casting porosity

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