JPS58202946A - Production of casting mold - Google Patents

Abstract

PURPOSE:To accelerate curing and to improve productivity by mulling a binding material consisting of an alcohol soluble phenolic resin, hydroxide or oxide of polyvalent metals,water and hydroxide of alkali metals and refractory particles, putting the mixture in a pattern, permeating CO2 therethrough to cure the mixture, removing the casting mold and heating the same with microwaves. CONSTITUTION:A binding material for a casting mold to be cured by gaseous CO2 consisting of an alcohol soluble phenolic resin, hydroxide or oxide of polyvalent metals, or both, water, hydroxide of alkali metals, and, if necessary, polyhydric alcohol and lower monohydric alcohol is prepd. The binding material is mulled with refractory particles to produce system sand which is then put into a pattern and is molded. Gaseous CO2 is permeated through the molding to cure the same. The casting mold is removed from the pattern after curing and is heated with microwaves.

Description

DETAILED DESCRIPTION OF THE INVENTION Regarding the improvement of the rapid curing molding method in the mold manufacturing method in which organic caking material is F-cured by carbon dioxide aeration with carbon dioxide gas aeration VC-L 7 This invention relates to a method for improving the intensity of VLL by irradiating microwaves from a model.

In the conventional method of hardening sand using M-type compound as a caking agent after molding by applying returned acid gas, the strength due to a1COx gas aeration was insufficient, and the mold was damaged. The lifting platform V is humid due to the raining and heavy rain (this tendency is due to the cooling of the dry ground and low humidity).
The fact that the water contained in the organic binder that is used for toileting is caused by residual water is an uninventive aspect of the present invention.

SUMMARY OF THE INVENTION One object of the invention is to provide a method for manufacturing a VLLD fast-curing mold, which removes moisture remaining in the mold area which causes the lack of frequency, which is a drawback of conventional molds. .

In the present invention, a mixture of alcoholic phenolic resin, b) polyvalent metal hydroxide, and its oxide, C) alkali metal hydroxide with water, and e) polyvalent metal hydroxide as required. Rba gas-curing mold viscosity II consisting of alcohol and f) one lower alcohol if necessary! 5 Materials and refractory particles are kneaded and carefully distributed, placed in a sand mold, and then hardened by aeration of carbon dioxide. The present invention relates to a method for manufacturing a mold that has a t% heating effect.

The inventive microwave heating VLL9 molding method of the present invention has fast curing, which not only increases productivity, but also reduces the weight of carbon dioxide QJf.

In the case of primary microwave irradiation, the mold taken out from the mold can be softened on a conveyor and heated to a constant temperature, so it is much easier to irradiate compared to hot air heating, which is performed inside the model and does not cause any radiation. The method of the present invention improves the quality of chestnut production by pre-heating COI gas at 17°C.Since ICL gives strength to remove the mold from the model, micro-coat is applied only to the mold. It is possible to irradiate waves 1. 72: Yes.

There is no need to choose Microwave TLL, which does not generate heat, and make all the molding models.

To the alcohol-soluble phenol injection resin used in the invention, phenol injection = txite + o-fold type water and 2
When thoroughly stirred at 5°C, t1 produces a lump that can be seen with the naked eye. Even if a part of the resin is water-soluble, the resin used as a whole must have the above-mentioned properties.

Alcohol-soluble 2-enols used in the invention 81: As resins, so-called alcohol-soluble phenol-formaltehyde resins, phenol-modified cylene resins, 2-enols, toluene fat, cashew shell, D
Resins such as FK (shale oil) resins have dienolic hydroxyl groups in their sieve molecular skeletons that form salts with polyvalent metals.

For example, the lightness of 2-enol formaldehyde is % i''Generally water bathing phenol form: 11 Aldehyde and alcohol-soluble 2-enol formaldehyde! Divided into 0 bathing phenol formaldehyde = q shield op Enol and formalin are reacted under an alkaline catalyst with a total of 2 enols.The cooling IL reaction is stopped before the compound loses water solubility, and the amount of 2 enol or less in the alkali catalyst is stopped. It is a low-molecular resin with an average molecular weight of about 200 and whose main component is On the other hand, it is an alcohol-soluble 2-enol formaldehyde side shield and 2-polymer resin. Water-soluble phenolic BFI has a small molecular weight and low viscosity, so it has low strength even after being poured into a mold and blowing carbon dioxide gas into it, and also has a low LJJ degree after being released. Therefore, in order to make the polyvalent metal salt of the phenolic compound used in Invention X to be dissolvable in water and to have sufficient cohesive strength, it is preferable that the molecular weight υ is small, and the number average molecular weight is preferably 400. The above is even better! ! ShikurI500
Above, the formula has a VCC of 10, 800 or more.

Alcohol layered phenolic compound used in the invention
'AfIU resol type, novolac type, N-methylene resol, dimethylene ether type resol, formal type resol, etc.@Alcohol-based phenol-poured fat may not be used unintentionally, regardless of the binding form of the fat. As for the phenols that are related to resins, only phenol can be used, such as cresol, bunalphenol, bisphenol, nonylphenol, catechol, and resorcinol.As for aldehydes, formalin, paraform, and hexamine are used. For acetaldehyde q (5 (/J lower aldehyde'), the same phenol-based bottle used in 1 can be used.

X oxidation of polyvalent metal
Ba, Fe, Ni, Ti.

Although hydroxides and oxides of Si, Sn, etc. can be used, hydroxides of alkaline earth metals are preferred from the viewpoint of reactivity with dienolic @ fats, i/, and I affinity with water. ”/l
;Eo oxide or rL, especially Ca, 8a.

Picture of hydroxide spx/, eh. Its oxide is preferred.

Effective use of hydrates and oxides of alkaline earth metals other than Ca in combination with calcium hydroxide and calcium oxide.

Meki Sedo Q1 Alcohol bath note 2 Enol note Juju B effect 100
! ffi part i'c river and good 2shiguiro ~, 500
The fi type part is not used.

Preferably 100 to 500 Kodobu is used for 100 M of alcohol-soluble 2-enolic fat in water. As the alkali metal, &'ffX sodium oxide, potassium hydroxide, and lithium hydroxide are used. M.J.

Sodium hydroxide is preferred because of its aqueous nature.

Full Cali Gold I! 4 times the amount of stool and 100 times the amount of 2-ethanol am fat!
It is preferable to use 10 to 100 double corridors for the capital.
Ru.

Ethylene glycol as s in flucol.

Propylene glycol, glycerin, diethylene glycol, pyrene glycol, trimethylolethane, trimethylolethane, fulvit, mannitol, and zulsit are used in combination.

If necessary, it is also possible to use lower grade 11-tone alcohol together with high-grade 11-tone alcohol. As class 11 alcohols, methanol, ethanol, n70 alcohol, inglovir alcohol, t-butyl alcohol, etc. are used.

Polyhydric alcohol, lower grade 11 according to the amount of alcohol in the stool
Good against alcohol-soluble 2-enolic resin 100 Ayudou! L<rr1~100M Kurabe et al.

As the refractory particles used in the invention, any IL that is normally used in the manufacture of square shapes can be used. For example, silica sand, zircon sand, olivine sand, and chromite sand are used.

It is also possible to add graphite powder and core dust additives to the composition.

Although there are no specific regulations regarding the method of attaching the caking material to the refractory particles, it is recommended to use a speed mixer, continuous mixer, Mer 2, etc. to reduce the continuity of the caking material. is preferred.

The present invention (↓) It is preferable to store the molding composition obtained by kneading the caking material into refractory particles in a closed container, but it is preferable to use it as soon as possible. .

For curing, use 41 + R acid gas. Must be 100
%CO□ f) It is a gas containing carbon dioxide gas without 4C, and n is a gas that is sweetened with resin and other materials and is the pressure necessary to flow back between the particles when they are loaded with refractory refractory particles. I was working on the carbon dioxide scum that made the noise of the circulation.

Once the mold has hardened in the violet of carbon dioxide gas and reached a level where it can be removed from a pattern such as a wooden mold, it is ready to blow. It takes about 6 to 120 seconds at a normal gas pressure of 0.1 to 50 cm/af, depending on the thickness of the mold and the air permeability of the refractory particles.

Inventively, it is added to refractory particles to L-shaped caking material and used as a composition for square shapes. 17. To refractory particles. It is preferable that the I-certificate is mixed evenly and the refractory particles are thoroughly mixed.
The fecal amount of the slime material is preferably 1 to 1001 parts of human particles. EL<OU, 5 to 202 [ft ff! Although there are no restrictions on the method, a portion of each f5. In liquid form, emulsified form,
It can be added as a suspension to form a caking material. Good 1
First, prepare an alcohol bath solution containing 2 enols, an aqueous alkali metal solution, polyhydric alcohol, or polyhydric alcohol and full alcohol to avoid contact with refractory particles. Polymer 1L [II Bonyong's water saponification h' L U 7, 00 parts to be used as a molding composition with sintered oxide on eaves, completed in a water bath solution. Publicly known as Jakusui Chudan of alkali metals,
Using charcoal and gas, it becomes easier to remove phenol-based saltworms from deer.

Is this invention the following? Implementation p, +ytL will congratulate you in detail, but is it a caking agent? ) Ingredients are mixed 3 times. Part 4 (summer type) and Ca (OH) 1
．． 5s (IE heavy), OD and am and 7Co samurai nπ
Sand tφ50×50h (/J After applying light to the molding model C
O2 gas at a pressure of 0.4 kg/- and a flow rate of 251/m
After ventilating for 10 seconds as in, remove from the model,
This product was heated in a 500W basket microwave for 6 minutes. This QJ test piece was subjected to IHr and 24 fires, and then the pressure ia was measured and the lees was 29 as shown in Table 1. I met this@ω,
Compared to the compressive strength measured with only a gas atmosphere, it is about 2 times the strength, and the effect is not recognized in the original state. A shell mold resin was used as a piece-shaped sticky paste.
Tsukasa), NaOH + O ern, and glycerin 51
] S and Nukunor 15 using a different fat bath liquid (part V Gori Sumito τ shown) 0

Claims (1)

[Claims] 1. a) alcohol-soluble di-enolic resin and b) hydroxide of polyvalent metal @ > J: Also, warped oxide and C) alkali gold a hydroxide with water and e) as necessary and polyhydric alcohol and f) lower grade 11m if necessary! A carbon dioxide hardening phase @ type viscous material consisting of alcohol and t-kneaded with refractory particles fJ! A method for producing a mold, characterized in that the mold is molded into a mold, hardened by passing carbon dioxide gas through the mold, the mold is taken out from the model, and the mold is heated by microwave heating.