Molding method for laminated mold
A casting mold and sand layer technology, which is applied to casting molding equipment, casting molds, and casting mold components, can solve problems such as temperature difference, need for secondary roasting, and easy generation of internal stress, etc. The effect of secondary roasting
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[0092] Hereinafter, some examples of the present invention are shown to explain the present invention more specifically, but the present invention is of course not limited by the description of such examples. In addition, it should be understood that in the present invention, in addition to the following examples, and furthermore, in addition to the above-mentioned specific descriptions, as long as they do not deviate from the spirit of the present invention, various changes, corrections, improvements, etc. can be added based on the knowledge of those skilled in the art. . In the following examples and comparative examples, the measurement of the flexural strength and the confirmation test of nozzle clogging were performed as follows.
[0093] - Flexural strength (N / cm 2 ) Determination -
[0094] Using a test piece having a size of 30 mm in width×10 mm in height×85 mm in length, the breaking load was measured using a measuring device (manufactured by Takachiho Seiki Co., Lt...
manufacture example 1
[0101] As the refractory aggregate, commercially available spherical artificial sand for foundry, namely LUNAMOS #50 (trade name: manufactured by Kao Corporation), was prepared, and as a water-soluble binder, a commercially available alkaline resole aqueous solution: HPR830 was prepared. (A brand name: manufactured by Asahi Organic Material Industry Co., Ltd.).
[0102] Next, the above-mentioned LUNAMOS #50 heated to a temperature of about 120° C. was put into a Shinagawa-type universal mixer (5DM-r type) (manufactured by Dalton Co., Ltd.), and then calculated in terms of solid content with respect to 100 parts by mass of LUNAMOS #50. The basic resole aqueous solution was further added in a ratio of 3.0 parts by mass, and kneaded for 50 seconds to evaporate water, while stirring and mixing until the sand lumps were disintegrated. After that, 0.1 part by mass of calcium stearate was added, mixed for 10 seconds, and then taken out to obtain dry coated sand A with free flow at no...
manufacture example 2
[0104] As the refractory aggregate, commercially available spherical artificial sand for foundry, that is, LUNAMOS#50 (trade name: manufactured by Kao Corporation), was prepared, and as a water-soluble binder, commercially available sodium silicate No. 2 (trade name: : A sodium silicate aqueous solution obtained by Fuji Chemical Co., Ltd.).
[0105] Next, the above-mentioned LUNAMOS #50 heated to a temperature of about 120° C. was put into a Shinagawa-type universal mixer (5DM-r type) (manufactured by Dalton Co., Ltd.), and then calculated in terms of solid content with respect to 100 parts by mass of LUNAMOS #50. The above-mentioned sodium silicate aqueous solution was further added in a ratio of 1.0 parts by mass, kneaded for 3 minutes to evaporate the water, and on the other hand, stirred and mixed until the sand block disintegrated, and then taken out to obtain a free-flowing product at room temperature. dry coated sand B.
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