JPS59212144A - Composition for self-curable casting mold - Google Patents

Abstract

PURPOSE:To act a titled compsn. as a cushion material in an org. self-curing casting mold and as collapsing agent in an inorg. self-curing casting mold without casting defects by forming grass contg. specific components into powder and adding the powder to a casting mold material. CONSTITUTION:The components of the grass to be used as an additive for a casting mold material consist, by weight, of 9% moisture, 16.0% protein 2.5% lipid, 23.7% fiber, 9.3% ash, 39.5% carbohydrate. A cushion material or collapsing agent consisting of such grass which is made into powder is added to the casting mold material and at least 3% Fe2O8 is added to provide the compsn. for the self-curing casting mold.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a self-hardening molding composition. Water glass is used to manufacture inorganic self-hardening molds, but in order to prolong the curing time of the mold if water glass alone is used, the Dical method uses Thai calcium silicate as a hardening accelerator, and the N method uses ferrosilicon. There is a process. Also, as a gas set system, there is a CO2 gas method in which carbon dioxide gas is aerated.

Further, self-hardening molds using inorganic/organic/combined methods include 1, the Recasset method using water glass and ester as a hardening agent, and chelate molding using cement with polyol as a hardening agent.

However, the common drawbacks of molding sands using water glass as a binder are poor disintegration and resuspension of foundry sand. For this reason, fiber-based disintegrants such as Wood 7 Lawer (walnut powder), wood powder, and other disintegrants made from graphite and pitch-based materials are commercially available as disintegration aids. The reality is that there is no definitive disintegrant. In addition, there is a risk of workers contracting white wax disease due to the poor disintegration of the residue. Self-hardening property, enol self-hardening property 2>i, reed, pull kit grade resin, oil urethane self-hardening property by urethane curing method of phenol resin,
As a phenol urethane self-hardening Shigaset type,
There are 80w method using SO2 gas peroxide and cold box method using amine gas.The binder of these organic self-hardening molds is flammable, so it rapidly decomposes or burns as soon as the molten metal is poured. Casting defects such as veining, gas defects, and S1 defects are likely to occur, so countermeasures are difficult. Regardless of the material (cast, male pull, ductile, FC, etc.) and the degree of collapse, burn-out, penetration hot cracking, and sand mold defects occur. This is due to the fact that organic self-hardening molds often suffer from problems such as lack of shrinkability and filling properties, and the use of iron oxide or various cushioning materials is said to be effective as a countermeasure. However, for large castings such as red steel, which have a large shrinkage rate, their effects are hardly recognized.

The present invention solves these drawbacks and provides a composition for self-hardening molds that acts as a cushioning material for organic self-hardening molds and as a disintegrant for #rF4 self-hardening molds. It is.

The ingredients are: Moisture 9.0 Protein 16.0% Lipid 2.5% Fiber 23.7% Ash 9.3% Li 7 (P)
z 2 sm9/1 oo g iron (F
e) 34.0mp/100g Calcium (Ca) 1.22% Sodium (Na
) 571) 1g/100g potash Rum (
K) 2.72% 2% Magnesilla Mg) 235#I9/100
It consists of pasture consisting of g.

Please add at least 20g of Fe to the grass containing the above ingredients.
% culm is added to promote self-hardening. Child PL, 1st (he) -M- for the 1st section (1 is also good b)
It's coming.

In addition, the grass with the above ingredients is especially for calves, and although it is described as a cushioning material in the above, it acts as a cushioning material for organic self-hardening molds, but it acts as a disintegrant for inorganic self-hardening molds. It acts as a.

Next, the relationship between various cushioning materials and strength when used on cast steel using the cold box method, where it is said that the cushioning material has almost no effect on cast steel or large castings, is as follows.
Let's use the experimental example shown in Figure 1.

Example sand-blended artificial silica sand Nichiyo No. 6 () f-60) Binder Bart I (phenol resin) 1.1
%/sand weight per) n (polyisocyanate) Section 1.1/Sand reed ax amine gas inversion, time (1cc), 10 seconds of air, 15℃, humidity 64%.

Figure 2 shows an experimental example of its use as a disintegrant.

This experimental example shows the relationship between the disintegrant and residual strength in the CO2 method, and was conducted at a temperature of 23°C and a humidity of 63%.

In addition, Figure 3 shows a copy of the casting test for cast steel.

Figure 3 B compares the condition of this product (hereinafter referred to as the product of the present invention) with 1% added and 1% walnut flour. This is a comparative example of the additive-added product and the non-additive-free product.The casting test photograph was taken to investigate whether or not vening occurred. However, according to the present invention, the 23.7% fiber in the ingredients improves the hot cushioning properties, and the calcium carbonate in the 1.22% calcium improves the hot cushioning properties of the mold. Make the atmosphere better.

The reaction of 0 produces CO gas, which has the same effect as coal powder and improves the casting surface.

Furthermore, by adding it to organic self-hardening molds, it is a composition that imparts shrinkability to foundry sand and can prevent burn-out, penetration hot crack sand defects, etc. Moreover, the addition amount is only 0.5% υ
Compared to commercially available cushioning materials, the effect can be fully demonstrated with a small amount of gradual addition of 1% to 6%.Furthermore, the present invention improves the collapsibility in various molds,
Moreover, it can be used as a cushioning material for organic self-hardening molds to prevent veining and penetration.

[Brief explanation of drawings]

The figure relates to Example 1 of the present invention. Button 11 is an experimental example in which the composition of the present invention was used in cast steel. A figure showing the relationship between the addition of various cushioning materials and the strength in the cold box method. Figure 2 is a test chart for use as a disintegrant, and Figure 3 is a photograph of the #Ji needle incorporation test. Attorney (Patent Attorney 1) Osamu Watanabe Oki Procedural Amendment (Method) 1. Display of the case 1982 Patent Application No. 85448 2, Name of the invention Self-hardening molding composition 3, Person making the amendment Relationship to the case Patent applicant Takara Starch Power Gata Name Shi Yuka Gaku Co., Ltd. 4, Agent Person 〒164 382-6771 (main)
Date of dispatch: August 10, 1988 August 30, 1988 6. Subject of amendment (1) Delete from page 6, line 17 to page 7, line 6 in the specification. (2) In the 8th line of page 8, the word ``table'' is corrected to ``[figure]''. (3) Delete "Figure 3 is a photograph." in the 8th line of page 8. (4) Attach a separate reference photo as a "reference photo." (ri) + 31 father wo katsui → fu That's all (complete)

Claims (1)

[Claims] <1) At least 9% moisture and 1% protein in the button type
6.0%, lipid 2.5%, fiber 23.7%, ash 9.3
(2) Powdered grass containing 39.5% carbohydrate and at least 9% moisture and 16% protein for molding.
．． 0%, fat 2.5%, fiber 23.7%, ash 9°3%
A self-hardening molding composition comprising a cushioning or disintegrating agent made from powdered grass containing 39.5% carbohydrates and at least 3% Fe2O2.