Resin coated sand

A resin coating and coating technology, which is applied to casting molding equipment, molds, cores, etc., can solve the problems of dimensional accuracy, low sphericity of molding sand, poor fluidity, etc., and achieve high mold strength and sand discharge Excellent performance and fluidity

Active Publication Date: 2007-03-14
KAO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silica sand is widely used as a molding sand used as an aggregate for resin-coated sand, but its shape is indeterminate and its fluidity is poor, so it has been restricted in filling more and more complicated core shapes in recent years
In addition, silica sand has a large thermal expansion, so there is also a problem in dimensional accuracy
[0003] Therefore, as a method for solving these problems, it has also been proposed to use spherical molding sand produced by a granulation firing method, etc., but the obtained molding sand has a low sphericity and only por

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example

[0096] Examples 1-2 and Comparative Examples 1-4

[0097] (1) Manufacture of RCS

[0098] As the molding sand, the molding sand obtained above and Flattery Silica were used. Their chemical compositions are shown in Table 1. In Table 1, Flatelli silica sand is conventional amorphous silica sand, and fired famulite sand and electric fusion sand correspond to conventional spherical molding sand.

[0099] RCS was manufactured using the molding sand shown in Table 1 and the various components of the binder composition shown in Table 2 at the ratios shown in Table 2. Specifically, after heating the molding sand at 150° C., 1.0 parts by weight of a phenolic resin (AV Light, Asahi Organic Materials Co., Ltd.) was added to 100 parts by weight of the molding sand and kneaded. Next, the temperature was lowered to 105° C., and at this temperature, 0.83 parts by weight (0.15 parts by weight in terms of solid content) of an aqueous hexamethylenetetramine solution (curing agent, concentra...

Example

[0110] Embodiment 3~4 and comparative example 5~6

[0111] Using the molding sand in Table 1, RCS coated with resin in the same manner as in Example 1 was used to obtain molds with the composition in Table 4, and casting experiments were performed on each of them. First, using RCS, fired at 250°C for 90 seconds to form a test core mold. Set the test core in the main mold of another shape, and cast the melt of cast iron (FC2000) at about 1470°C. After casting and cooling (after standing for 2 hours after the end of casting), the mold was observed for cracking. Afterwards, the mold was disintegrated by beating the core, and the veined casting scars and sintering on the core surface were observed. The results are shown in Table 4. In addition, in Table 4, "◯" of mold cracking means that there was no mold cracking, and "X" means that mold cracking occurred. In addition, "○" of the vein scar means that there is no vein scar, "△" means that the vein scar is slightly generated, and...

Example

[0113] Embodiment 5 and comparative examples 7,8

[0114] RCS was produced by the following method, and evaluated by the following method. The results are shown in Table 6.

[0115] (1) Manufacture of RCS

[0116] The spherical molding sand of the present invention product 2 of Table 5 obtained by the same manufacturing method (flame melting method) as the present invention product 1 of Table 1, and the fired famullite sand B of Table 5 obtained by the firing method were used. In these molding sands, RCS was manufactured by the same method as Example 1 etc. except having used the component shown in Table 6 in the quantity shown in Table 6. In addition, in Table 6, the phenolic resin B is a novolak type phenolic resin, and it made the melting temperature of RCS into 110 degreeC. This melting temperature is measured based on JACT test method C-1 (melting point test method).

[0117] (2) Evaluation

[0118] (2-1)

[0119] The bending resistance was measured using the same m...

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Abstract

The invention provides a resin-coated sand, which is obtained by coating spherical molding sand with an average particle diameter of 0.02-1.5 mm and obtained by a flame melting method with a binder composition.

Description

technical field [0001] The present invention relates to resin-coated sand used in casting molds for casting steel, cast iron, aluminum, copper, alloys thereof, and the like. Background technique [0002] The shell molding method is a casting molding method in which resin-coated sand coated with phenolic resin or the like is added to a preheated mold and heated to cure it. This method is widely used in the foundry field. Silica sand is widely used as a molding sand used as an aggregate of resin-coated sand, but since its shape is indeterminate and its fluidity is poor, filling of more and more complicated core shapes has been limited in recent years. In addition, since silica sand has a large thermal expansion, it also has problems in terms of dimensional accuracy. [0003] Therefore, as a method for solving these problems, it has been proposed to use spherical molding sand produced by a granulation firing method, etc., but the obtained molding sand has a low sphericity and ...

Claims

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Application Information

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IPC IPC(8): B22C1/00B22C1/22
Inventor 伊奈由光
Owner KAO CORP
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