JPS58202947A - 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 into a pattern, permeating compressed air therethrough and permeating CO2 through the casting mold after cooling then removing the mold. 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 and refractory particles are mulled to produce system sand which is then molded. Compressed air is permeated through the obtained sand mold to cool the same, whereafter CO2 is permeated through the mold to cure the same and the mold is removed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing #-type CtJ that cures carbon dioxide. Q) M compound and C) alkali metal hydroxide with water and C)
QkIIlb alcohol depending on the required amount and f) a mixture of adhesive material made of lower 111111 alcohol and refractory particles depending on the required amount, and a vtt for aerating carbon dioxide gas.
Is there a way to manufacture the #1 mold by converting it into v&?It has the drawback that the mold strength sometimes decreases in the summer, and it is difficult to manufacture large qms molds or complicated molds. Mold manufacturing method V (related to Q
% casting strength (tJ
◇ The cause of the decrease in tJJl field and the strength of both molds has been studied and it has been found that the fc sum is less than υ, which led to the present invention. Alkali gold mυ of alcohol-resistant phenolic resin, b) polyvalent gold^O hydroxide 2L/1 and its European compound, and C) water.
Hydroxide and e) Necessary Ji! f) with polyhydric alcohol depending on
Depending on the requirements, M-type dead shaft material consisting of lower-hydric alcohol and refractory particles VC kneaded with %ctJ are exposed to a charcoal gas atmosphere to create mold viscosity. 19 Alcohol-based phenolic (I [l] produces polyvalent metal salts and alkali carbonates in the presence of carbon dioxide gas or alkali metal salts). The vortex rises. # due to carbon dioxide aeration
I8 type compaction difference, mold size, distribution of mold caking material 1
t or 0 return acid gas @VtL is different, usually 0 to 40℃
That's about it.

Especially in the summer (tJ is easier to take care of than IJ), the mold temperature is about 40℃ before carbon dioxide gas ventilation, and the -k of M type becomes 40~80℃VL due to the heat generated by the returning acid gas. This is %1.Due to stiffness, the T1-type dried lees material becomes steamed due to heat, which causes the alcohol-resistant phenolic fat, which is the main component of the dried lees material, to soften. It was found that tb was the cause of the decrease in mold strength.The mold was heated to 1ζ0, cooled, and then degreased by passing carbon dioxide gas through it.
T-work 9 carbon dioxide gas 3+! ! 1. , the alcohol-soluble phenolic resin υ prevents the temporary reaction heat VL L from softening, reduces the leukemia of the mold, and enables rapid production of VC molds. This is because the heat t-scavenging type interior 1 can provide M-effect cooling.

By ventilating 1 round 'A', the air permeability of the fs mold will be improved, and the CO passed through later will be properly distributed throughout the mold, resulting in CO cod O saving VL%.

In addition, the mold temperature is forced to cool to 40℃ or less, and further to 050℃.
It is preferable that the temperature is as low as ℃ or less, and it is preferable that the rcg temperature be cooled for a short time. By lowering the C, it is possible to suppress the decline in both types of tonicity.

Also, compressed air (tJI!! It is preferable that the pressure is lower than 1 degree)
It is better to attach a vent η (-) to a pattern such as a 0-history PC wooden mold, which is preferable to be smooth, and to take care of the gas.

Even if the alcohol-soluble phenolic resin thorn 1 and the alcohol-soluble resin 7-layer compound is sufficiently stirred at 25'C with 10 times the amount of water, it can be determined with the naked eye. Water-insoluble tree::,...1≧,.

Refers to fat. Ding rope Resin with water miscibility of 10 or less
And both parts of the resin are water-soluble resins and are expressed as IC%.
Does the IL resin used have the above-mentioned properties as a whole? : have n
Bye.

The alcohol-soluble phenolic resins used in the present invention include not only so-called alcohol-soluble phenol formaldehyde resins, but also phenol-modified xylene resins, phenol-modified toluene resins, cachet resins, and DFK (j
It is a W fat that has t% of phenolic hydroxyl groups that form salts with polyvalent metals in its molecular skeleton υ.

Marutoe Fi Mitsuenol Formaldehyde 41 Jim
Regarding K, it can be roughly divided into - yield Vt water soluble 2 enol formaldehyde 4U and alcohol soluble enol formaldehyde resin 0 water soluble 2 enol formaldehyde 4M umbrella phenol and formalin t MA1 under alkaline catalyst ! If the reaction is carried out, the reaction must be stopped by cooling before it loses its water leakage property.
1. It is a low molecular weight υ@hpo with an average molecular weight of about 200, which is mainly composed of 28 nor trinuclear bodies.For this, the alcohol-soluble phenol formaldehyde side is 0s6.
Molecule resin ◎Water bath property 2 enol tree side 0 The molecule 1/k of the resin is small and the viscosity is low, so it is an IM friend of the lifting platform where carbon dioxide gas is blown into the mold.

In addition, the IZJ tonicity of neglected children is also low.Therefore, they are not used in the present invention.
In order to give the phenolic resin its polyvalent metal salt or water 111% to give it sufficient viscosity, the molecule 'IILo
The number average molecular weight is preferably oaoo or more, more preferably 500 or more, and even more preferably α8.
00 or more υ or L.

4 Guanming rL is used for resol type 3 novo 2 tsukumaro, N methylene resol, dimethylene ether resol for the alcohol-based phenol company embroidery.

Formal and sol, etc. # Fat M type VC Regardless of alcohol layer 2 enol injection IM fat, this purpose yt1
j! ! 1 because you can use it! Regarding the 6% resin and raw materials, not only 2enol but also cresol, butyl2enol, bis2enol, nonylphenol, catechol, resorcinol, etc. can be used.For aldehydes, formalin, pa2forA, etc. can be used.
, hexane, phenolic resins containing lower aldehydes such as acetaldehyde are used.

Hydroxide production of polyvalent metals/Casing fc0 As its oxide * Cae Mgl At, Zn, 13a, Fe
, Ni, Ti.

5M hydroxides such as Si and Sn can be used! ! However, alkaline raw metals are preferably used due to their reactivity with phenolic resins and affinity with water, especially Cm and Ba.

Preferably, a Li hydroxide (Li hydrated 2/19 oxidation tube) is used. Hydroxides of V alkaline earth metals other than Ca.

Calcium hydroxide and calcium oxide can be used in conjunction with LC L 9. It can be effectively used in combination with alcohol.
I like it! t, <010~5001its, using 30% alcohol layer in water and preferably using 500~5001% per 100 weight units of enolic resin0 as alkali metal, sodium hydroxide, Potassium water, lithium hydroxide, etc. are used as! 1 Aqueous 8 degrees to sodium hydroxide is acrylic O alkaline metal toilet ii
rJ 7 s) - preferably 10 to 100 μL 4 to 10 Omjli portion.

Ethylene glycol as a polyhydric alcohol.

Propylene glycol, glycerin, diethylene glycol, dipropylene glycol, trimethylolpropane, trimethylolethane.

Sorbit, mannit, zurcit, etc. can be used alone or in combination. ◆It is also possible to use lower monohydric alcohol in combination with painting alcohol if necessary. ・Methanol is used as a lower monohydric alcohol. ,ethanol.

N-propyl alcohol, iso-10 alcohol, t-butyl alcohol, etc. are used.
．． Preferably, 1 to 100% of electric current is applied to the bath-based phenolic resin 1003. For example, silica sand, zircon sand, oripin sand, chromite sand, etc. can be used. % bJ 660 viscous material mixed into refractory particles a special method (required 4%) Although it is too much to say, as a speed mixer, a continuous pile mixer,
I like things that have continuity, such as Mar 2.

Refractory particles l (kneaded 6 times and 7 times
t#I! It is preferable that the mold composition σ be present in a closed valley vessel, but the Ikf case and α should be mixed as quickly as possible.
It is not necessary that Om is a gas rich in carbon dioxide, but nI/i
When the refractory particles mixed with resin and other ingredients are placed in a mold, the particles are passed through the hole (necessary pressure, flow rate t-4
It is possible to make it with carbon dioxide gas 〇The air bacteria in the violet of carbon dioxide gas is hardened and can be cut out from patterns such as wooden molds.Normally gas pressure 081 ~ iokg /(1”t'3~1
20 seconds hrt u good, hook mu size.

Refractory particles 0 Varies depending on breathability ◎'X invention vC
L Karatsumugi material is added to the large particles 1 and #kanyo group II
When used as a refractory material, it is preferable that the refractory particles have an evenly mixed sweetness on the edge of the refractory material, and that the refractory particles are evenly coated. The sticky material υ is preferably 0.5 to 20 for the toox'it part, and preferably 1 to 10 for the IIL part.
I use the irises. There are no particular restrictions on the method of addition to the refractory particles, but each component of the viscous material QJ may be partially or completely mixed into a powder in advance.t1 Water, +
It can be added to the SS agent in the form of a bath liquid, emulsion, or suspension to form a slime material.◇Preferably, an alkali metal watertight liquid of a smooth, moist, alcohol-soluble di-enol resin. Prepare a solution of tetrahydric alcohol or polyhydric alcohol and lower monohydric alcohol, and oxidize the hydroxides of polyvalent metals νL and σ−t on the refractory particles. The materials are mixed to form a molding composition.

This υL5 is a mixture of two enolic resins in a water bath solution.
c Hydrophilic salts of alkali metals9. Carbon dioxide gas ventilation, 2
Enolic resin O facilitates the formation of polyvalent metal salts 〇 Below, the present invention will be applied to the present invention, and the moxibustion will be falsely revealed, depending on the type of viscous material component and one bottle per child. Invention r[1p
No restrictions apply to J et al.

Will the following be implemented? ! It's incorrect ◇ In a four-eye flask equipped with a condenser and a stirrer k, 940 g of phenol and 280 g of 80% rose formaldehyde are added.
hi'/s #28 g t-person R4&j and reflux degree (
Heat at 100-105℃ for 5 hours and dehydrate by yc
4, a novolak type phenol resin with a softening point of 85℃υ was obtained. ◎The samurai nyc novolak type phenol resin was obtained by the above method:
・Cm (
OH) * 75 gt was mixed with 5 kg for 2 minutes using a No. 6 speed sander manufactured by Enshu Iron Works for 2 minutes to obtain mixed sand. Trial of stiff mixed sand 1200grlOOφxtoommhIjIk
Breast wood mold R (molded and cooled under pressure #!! air, then vented to 251/m1n (iZ coal board gas' for 80 seconds) a Conventional method.F'l&l■■Failure to erupt tp3ytThis is a method unique to the present invention.6-11■Bottle*Pressure m 彊falseαFailure to occur 60 seconds after carbon dioxide gas ventilation.

14] After cooling the sand mold in the gills, the left side of the charcoal was vented to reduce the strength of the U mold.

Claims (1)

[Claims] 1. a) alcohol-soluble phenolic resin, b) polyvalent metal hydroxide, C) water and Φ alkali metal hydroxide, and C) polyvalent metal depending on the landscape. Alcohol and (f) charcoal gas made of lower 1f IJ alcohol if necessary.Knead the hook-shaped viscous material for hardening and refractory particles, mold the precipitated sand, press it into a precipitated mold, and blow air. Waa! is characterized by ventilation and cooling, and after warping, carbon dioxide gas is vented and demolded. ! manufacturing method.