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Mold material composition and method for manufacturing mold using same

A material composition and manufacturing method technology, applied in the directions of casting molds, casting mold components, manufacturing tools, etc., can solve problems such as difficulty in regeneration, high efficiency, and difficulty in removing water glass, and achieve inhibition of re-welding, dissolution, and disintegration. good effect

Pending Publication Date: 2021-11-12
ASAHI YUKIZAI KOGYO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when it is desired to recover refractory aggregate (sand) from the mold after casting and regenerate the recovered sand by roasting the conventional casting material composition using an inorganic binder, it remains in the recovered sand. The inorganic binder on the surface of the sand cannot be burned, but instead sinters and adheres relatively hard to the surface of the refractory aggregate (sand), so there is a problem that it is difficult to regenerate
In particular, the casting material composition using water glass as an inorganic binder has the following problems: the water glass is vitrified due to the heat during casting, and even if the recycled sand is subjected to roasting and grinding after casting, the sand Surface vitrified water glass removal is also very difficult
However, there is a problem that, for example, if the regeneration treatment method disclosed in this patent document is implemented on a foundry sand mold using water glass as a binder (binder), treatment water containing a large amount of alkali components derived from water glass will be generated, Further labor is required for treatment, disposal (processing) of the treated water
However, in order to vitrify water glass, firing at a high temperature of 900°C or higher is required, and it is difficult to say that it is an efficient method from the viewpoint of energy efficiency at the time of regeneration.

Method used

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  • Mold material composition and method for manufacturing mold using same
  • Mold material composition and method for manufacturing mold using same
  • Mold material composition and method for manufacturing mold using same

Examples

Experimental program
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Embodiment

[0108] Hereinafter, the present invention will be described in more detail using some examples of the present invention, but it should be understood that the present invention is not subject to any limited interpretation due to the description of such examples. In addition, in the following examples and comparative examples, unless otherwise specified, "%" and "part" are expressed on a mass basis. In addition, the disintegration test of the mold obtained by using each mold material composition (coated sand: CS) of the example and the comparative example, the evaluation of the recovered refractory aggregate (recovered sand), and the alkali reduction rate The calculation of pH, the measurement of pH, and the grinding peeling test were respectively performed as follows.

[0109] -Disintegration test of mold-

[0110] First, if figure 1 As shown, the half-division of the core seat fixing part 4 (this part is the discharge port for discharging the waste core from the casting) mad...

manufacture example 1

[0155] Using water glass (No. 2 sodium silicate), a water glass aqueous solution having a solid content (concentration) of 41% was prepared. Put the refractory aggregate (ESPEARL#60) into the Shinagawa-type universal mixer (5DM-r type, manufactured by DALTON CORPORATION) at room temperature, and add the above-mentioned water glass aqueous solution at a ratio of 1.0 part to 100 parts of the refractory aggregate , and add chlorinated paraffin (EMPARA 70) as a neutralizing agent at a ratio of 0.10 parts to 100 parts of refractory aggregates, knead for 3 minutes, stir and mix until it becomes uniform, then take it out, thus obtaining A wet-state casting material composition (wet-state CS: CS1a) in which a coating layer containing water glass and a neutralizer (chlorinated paraffin) is provided on the surface of the refractory aggregate.

[0156] -Production examples 2 to 4 of wet CS-

[0157] In the production example 1 of the wet state CS, the amount of the neutralizing agent (E...

manufacture example 9

[0167] In Production Example 1 of wet CS, except that 0.18 parts of chlorinated paraffin (Toyoparax 40S) was used as a neutralizing agent, a casting material composition in a wet state was obtained by the same procedure as in Production Example 1 above. (CS9a).

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Abstract

Provided is a mold material composition from which a mold having satisfactory collapsibility can be formed advantageously and a refractory aggregate (sand) that is collected after casting can be regenerated easily. A mold material composition is prepared using, as essential components, (a) a refractory aggregate, (b) a binder containing water glass as an essential component, and (c) a neutralizing agent with which a decomposition product generated by heating during casting can cause a neutralization reaction with an alkaline component in the water glass.

Description

technical field [0001] The present invention relates to a mold material composition and a method for producing a mold using the same, and in particular to a mold material composition capable of obtaining a mold having excellent disintegration after casting and easy regeneration of recovered refractory aggregates objects, and a method that can advantageously manufacture a mold exhibiting such excellent characteristics. Background technique [0002] Conventionally, as one of casting molds used in casting molten metals such as iron and aluminum, there is known a casting mold using coated sand (mold material) in which refractory aggregate is covered with a predetermined binder. Composition), molded into the target shape to obtain the mold. Furthermore, as the binder used for forming the covering layer in such a casting material composition, in addition to water-soluble inorganic binders such as water glass and sodium phosphate, the use of phenolic resin, furan resin, amino Org...

Claims

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Application Information

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IPC IPC(8): B22C1/02B22C1/10B22C1/18B22C9/12
CPCB22C1/18B22C1/02B22C1/10B22C9/12
Inventor 海川善久高间智宏
Owner ASAHI YUKIZAI KOGYO CO LTD
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