JPWO2007066509A1 - Management method of foam aggregate mixture - Google Patents

Abstract

A method for managing a foam aggregate mixture that can uniformly produce mold strength by monitoring and managing the state of the foam aggregate mixture before being pressed into the mold and stabilizing the filling property during molding. I will provide a. In forming a mold by filling a foam aggregate mixture obtained by mixing and stirring a particulate aggregate, a water-soluble binder and water into a heated mold cavity by a press-fitting method, the foam aggregate mixture is used. A method for managing a foamed aggregate mixture that is managed in a predetermined normal state, wherein the amount of the water-soluble binder, which is one of the characteristic factors indicating the mixed state of the foamed aggregate mixture, is measured. [Selection] Figure 3

Description

  The present invention relates to a method for managing a foam aggregate mixture. More specifically, a foam aggregate mixture obtained by mixing and stirring particulate aggregate, a water-soluble binder, and water is filled in a cavity of a heated mold by a press-fitting method, for example, a mold, for example, a main mold or a core. The present invention relates to a method for managing a foam aggregate mixture for producing the foam aggregate mixture in a predetermined normal state.

  In recent years, it has been proposed to mold a mold by using a water-soluble binder as a binder for particulate aggregates and evaporating moisture by heating to cure the water-soluble binder because it has good disintegration after casting. ing.

  As a mold making apparatus for making this type of mold, for example, a vertically extending cylinder, a plunger disposed in the cylinder so as to be movable up and down, and a gate for opening and closing the lower end opening of the cylinder can be moved up and down. And a means for press-fitting the fluid sand into the mold, and an opening is provided in the middle of the cylinder, and a mixer for obtaining the fluid sand is connected to the opening (Japanese Patent Laid-Open No. 55-54241). Issue gazette).

  Further, in the conventional mold making apparatus, the fluid sand that is put into the cylinder for press-fitting into the mold by changing the level of the cylinder, the lower gate and the plunger by providing a gate in the middle of the cylinder. You have been able to change the amount.

  However, in the conventional mold making apparatus, the foamed aggregate mixture, which is a mold material using a water-soluble binder as a binder, deteriorates the fluidity of the mixture when the water content is too low, so that sufficient filling cannot be ensured. Therefore, it is necessary to add water and knead further.

  In addition, even when the foamed aggregate mixture is too high in viscosity, it is necessary to re-knead because sufficient filling of the foamed aggregate mixture into the mold cavity cannot be ensured.

  Therefore, in view of the above circumstances, the present invention monitors and manages the state of the foam aggregate mixture before being press-fitted into the mold, thereby stabilizing the filling property at the time of molding, thereby ensuring uniform mold strength. It aims at providing the management method of the foam aggregate mixture which can be manufactured in the next.

  The method for managing a foam aggregate mixture according to the present invention comprises mixing a particulate aggregate, a water-soluble binder, and water, and filling the foam aggregate mixture obtained by stirring into a cavity of a heated mold by a press-fitting method. A foamed aggregate mixture management method for managing the foamed aggregate mixture in a predetermined normal state when molding a mold, wherein the water-soluble property is one of the characteristic factors indicating the mixed state of the foamed aggregate mixture It is characterized by measuring the amount of binder.

  The method for managing a foam aggregate mixture according to the present invention is a method in which a particulate aggregate, a water-soluble binder, and water are mixed, and the foam aggregate mixture obtained by stirring is filled into a heated mold cavity by a press-fitting method. Then, in forming the mold, the foam aggregate mixture management method for managing the foam aggregate mixture in a predetermined normal state, the moisture and viscosity among the characteristic factors indicating the mixed state of the foam aggregate mixture It is characterized by measuring.

  Furthermore, the method for managing a foam aggregate mixture according to the present invention is a method in which a particulate aggregate, a water-soluble binder and water are mixed, and the foam aggregate mixture obtained by stirring is filled into a heated mold cavity by a press-fitting method. Then, in forming a mold, the foamed aggregate mixture is managed in a predetermined normal state, and (a) one of the characteristic factors indicating the mixed state of the foamed aggregate mixture Measuring the amount of the water-soluble binder, (b) determining whether the amount of the water-soluble binder is within a range of a reference value, and (c) the water-soluble binder measured. When the amount is within the range of the reference value, based on the temperature measured when measuring the amount of the water-soluble binder from the relationship of the property properties of the foam aggregate mixture obtained in advance, the foam aggregate mixture Moisture and viscosity showing properties A step of determining a reference value, (d) a step of measuring moisture indicating a mixing state of the foamed aggregate mixture, and (e) whether the measured moisture is within the range of the reference value of the moisture. And (f) a step of measuring a viscosity indicating a mixed state of the foamed aggregate mixture when the measured moisture is within a range of the moisture reference value, and (g) the measured viscosity. And (h) when the measured viscosity is within the range of the viscosity reference value, the foamed aggregate mixture is in a normal state. It is characterized by including the process of determining.

  According to the present invention, the mold strength can be uniformly produced by stabilizing the filling property at the time of molding.

  Hereinafter, the management method of the foam aggregate mixture of this invention is demonstrated based on an accompanying drawing. First, as shown in FIGS. 1 and 2, the mold making apparatus used in the present invention has two upward cylinders 2, 2 installed on a platen-like machine base 1, and the machine base 1. Four guide rods 3 and 3 are erected at the four corners. Between the upper ends of the piston rods of the two cylinders 2, 2, an elevating frame 4 slidably mounted on the four guide rods 3, 3 is installed on the lower surface. The lower mold 6 of the horizontal split mold 5 is attached to the upper surface of the. Further, the upper mold 7 of the horizontal mold 5 is supported by the four sets of support mechanisms 8 and 8 mounted on the guide rod 3 above the lower mold 6 just above the lower mold 6. Are arranged.

  Further, a ceiling frame 9 extending in the left-right direction is installed between the upper ends of the four guide rods 3, 3. A function as a stirring tank and a press-fitting cylinder are provided at the right position in the lower part of the ceiling frame 9. The mixture storage means 10 having the above functions is disposed so as to be movable to the left side via the first traveling carriage 11, and the mixture storage means 10 is fixed to the cylindrical body 12 and the lower end of the cylindrical body 12. And a bottom plate 14 having a plurality of injection holes 13, 13 through which the lower end opening is closed and the mixture is injected. It is composed of materials.

  Further, at the right side position on the upper surface of the ceiling frame 9, a stirring blade mechanism 15 that mixes particulate aggregate put into the mixture storage means 10, a water-soluble binder that is soluble at room temperature, and water, and stirs and foams. Is installed. The particulate aggregate can be, for example, cinnabar. Moreover, as a water-soluble binder as a binder of this particulate aggregate, it can be set as polyvinyl alcohol or its derivative (s), and / or starch or its derivative (s), and a crosslinking agent. In the stirring blade mechanism 15, the stirring blade 16 is connected to the output shaft of a motor 17 via a transmission mechanism 18, and the motor 17 is operated by a contraction operation of a downward cylinder 19 attached to the ceiling frame 9. The support member 20 is mounted on the ascending / descending support, and the support member 20 is further provided with a cover 21 for closing the upper end opening of the mixture storage means 10. The cylinder 19 is moved up and down by the expansion / contraction operation.

  Further, a plug means 22 for closing the injection holes 13 of the mixture storage means 10 is disposed at a position directly below the stirring blade mechanism 15 in the ceiling frame 9. A plurality of plugs 23, 23 that can enter and exit the holes 13, 13 are attached to the upper end of the piston rod of the upward cylinder 25 via the support plate 24, and the plugs 23, 23 move up and down by the expansion and contraction operation of the cylinder 25. The cylinder 25 is attached to the ceiling frame 9 via support members 26 and 26. The injection holes 13 and 13 can also be cleaned by inserting a plurality of the plugs 23 and 23 into the injection holes 13 and 13.

  Further, a pressing mechanism that presses the mixture in the mixture storage means 10 and injects it from the injection holes 13 and 13 of the mixture storage means 10 at a position directly above the horizontal split mold 5 on the upper surface of the ceiling frame 9. In the pressing mechanism 27, a piston 29 having a plurality of exhaust holes 28 penetrating vertically is moved up and down by a contraction operation of the downward cylinder 30.

  Further, a mold pushing mechanism 31 for pushing the mold from the upper mold 7 is arranged at the left position in the lower part of the ceiling frame 9 so as to be movable to the right side via the second traveling carriage 32. In the mechanism 31, a plurality of mold extrusion pins 33, 33 are attached to the lower end of the piston rod of the downward cylinder 35 via the extrusion plate 34, and the mold extrusion pins 33, 33 are expanded and contracted by the cylinder 35. It moves up and down by operation.

  In view of the importance of the management of the foam aggregate mixture in order to produce a mold having a predetermined quality, the present invention uses the mold making apparatus to heat the foam aggregate mixture. When forming a mold by filling the mold cavity by a press-fitting method, the state of the foamed aggregate mixture before being pressed into the mold is monitored and managed.

  That is, the present invention first measures the amount of the water-soluble binder, which is one of the characteristic factors indicating the mixing state of the foam aggregate mixture. Then, it is determined whether or not the amount of the water-soluble binder is within a reference value range (for example, between the upper threshold value and the lower threshold value). Next, when it is within the range of the reference value, based on the temperature of the foamed aggregate mixture measured when measuring the amount of the water-soluble binder, the property characteristics (moisture, viscosity, The standard value of the characteristic factor indicating the property characteristic of the foamed aggregate mixture other than the water-soluble binder is determined from the relationship between the type and the particle size of the sand and the type and amount of the binder. The characteristic factor may be, for example, moisture or viscosity.

  Next, after measuring the state of the characteristic factor indicating the mixing state of the foamed aggregate mixture, the measured state value (water or viscosity value) is within the range of the reference value (for example, the upper threshold value and lower limit of the reference value). It is determined whether it is within the threshold).

  Then, based on the determination, it is determined whether the foamed aggregate mixture is in a normal state or the foamed aggregate mixture is adjusted. When it is determined that the foamed aggregate mixture is in a normal state, that is, the measured state value is within the range of the reference value, the foamed aggregate mixture is filled into a heated mold cavity by a press-fitting method. To mold a mold. On the other hand, when the foamed aggregate mixture is adjusted, that is, when it is determined that the measured state value is not within the range of the reference value, after adjusting the components of the viscosity and / or moisture, the state of the foamed aggregate mixture again Continue monitoring.

  Next, the procedure of the management method according to the embodiment of the present invention will be further described with reference to FIG.

(A) As shown in FIG. 3, the amount B of the water-soluble binder of the foamed aggregate mixture is measured (step S1).

  The foamed aggregate mixture is agitated and foamed by mixing particulate aggregate, water-soluble binder, and the like and water, which are put into the mixture storage means, with a stirring blade mechanism. Examples of the particulate aggregate include dredged sand, alumina sand, olivine sand, chromite sand, zircon sand, mullite sand, and various artificial aggregates. Examples of the water-soluble binder as the binder for the particulate aggregate include polyvinyl alcohol, for example, polyvinyl alcohol having a saponification degree of 80 mol% to 95 mol% or derivatives thereof, and / or saccharides such as starch or the like. It can be a dielectric. The water-soluble binder contains, for example, 0.3 wt% to 10 wt% by weight, preferably 0.3 wt% to 5 wt% by weight, based on the particulate aggregate. The water is water other than alkaline water. Water is, for example, 2 to 10 wt% with respect to the particulate aggregate.

  Examples of starch include potato, corn, tapioca, and pregelatinized starch derived from wheat flour and dextrin. Examples of starch derivatives include etherified starch, esterified starch and cross-linked starch. Sugar is sucrose and is a saccharide in which glucose and fructose are combined one by one. Examples include fine white sugar and granulated sugar. The water-soluble binder used in the present invention is easily available. In addition, pregelatinized starch, dextrin, sugar and the like are particularly inexpensive. Here, pregelatinized starch, dextrin or a derivative thereof, saponin, and sugar are soluble in water at room temperature.

  Moreover, the water-soluble binder in the present invention contains a cross-linking agent that causes a cross-linking reaction, thereby strengthening the bonding between the particulate aggregates coated with the water-soluble binder.

  The crosslinking agent used in the present invention is a compound having a carboxyl group such as oxalic acid, maleic acid, succinic acid, citric acid, butanetetracarboxylic acid and the like, and a vinyl vinyl ether-maleic anhydride copolymer, isobutylene, which are crosslinked by an ester bond. -A compound having a carboxyl group in an aqueous solution such as a maleic anhydride copolymer. In addition, as the crosslinking agent used in the present invention, it is preferable to use a crosslinking agent that forms an ester bond, that is, a crosslinking agent having a carboxyl group, which generates little harmful gas during casting or pouring of a mold.

  The addition amount of the crosslinking agent used in the present invention is 5 to 300% by weight based on the water-soluble binder. If the amount of the crosslinking agent is less than 5% by weight with respect to the water-soluble binder, the effect of the crosslinking reaction is not sufficient, and sufficient strength cannot be maintained when the molding mold is placed under high humidity. Further, when the amount of the crosslinking agent exceeds 300% by weight with respect to the water-soluble binder, sufficient strength can be maintained when placed under high humidity, but the effect is not different from the effect of 300% by weight. Addition of greater than% is not economical and not preferred.

  In the present invention, the crosslinking agent is used as an aqueous solution. For example, in the case of butanetetracarboxylic acid, citric acid, methyl vinyl ether-maleic anhydride copolymer, it is used as an aqueous solution having a concentration of 10% by weight or more.

  An appropriate measurement method can be used for measuring the amount B of the water-soluble binder. The amount B of the water-soluble binder can be estimated from the amount of the active component among the water-soluble binder components, and can be represented by, for example, the amount (concentration) of carboxylic acid. The amount of the carboxylic acid can be measured by an analyzer using a coulometric detection method or high performance liquid chromatography. For example, the concentration is measured by a detector using an electrode and an ion sensitive membrane under temperature control.

  Examples of the carboxylic acid include monocarboxylic acids, dicarboxylic acids, and tricarboxylic acids having 1, 2, or 3 carboxyl groups in the molecule. Examples of the monocarboxylic acid include acetic acid and lactic acid. Examples of the dicarboxylic acid include malic acid, oxalic acid, malonic acid, and succinic acid. Furthermore, citric acid etc. can be mentioned as tricarboxylic acid.

(B) Next, it is determined whether or not the amount B of the water-soluble binder is between the upper limit threshold value Bsuth and the lower limit threshold value Bsdth that are within the reference value range. The upper limit threshold value Bsuth and the lower limit threshold value Bsdth can be set in advance by experiments.

(C) When the measured amount B is within the range of the reference value, the process proceeds to step S4, and when it is not within the range of the reference value, a deficient water-soluble binder is replenished and stirred (kneaded) again (step) S3).

(D) Next, showing the property characteristics of the foam aggregate mixture based on the temperature measured when measuring the amount of the water-soluble binder from the relationship between the property characteristics of the foam aggregate mixture obtained in advance. In this form, the reference values Ws and Vs of moisture and viscosity that particularly affect the quality of molding are determined (step S4). The temperature in step S4 is this temperature when measuring under the temperature control when measuring the amount of the water-soluble binder, and separately measuring the contact type or the non-contact type when measuring without controlling the temperature. Temperature measurement means, for example, as a contact-type temperature detector, a thermocouple-type temperature sensor, etc., or as a non-contact-type temperature detector, a method using a laser, infrared (thermograph), ultrasonic wave, etc. The temperature measured by the sensor is used.

  Depending on the temperature change of the foam aggregate mixture, the moisture, the degree of viscosity, etc., the fluidity of the mixture and the bubble rate change, for example, the mold molding quality such as filling property at mold molding and mold strength, Correlations such as temperature, moisture, and viscosity have been previously determined experimentally as the relationship between the properties of the foamed aggregate mixture.

(E) Next, the moisture W indicating the mixed state of the foamed aggregate mixture is measured by the moisture measuring means (step S5).

  The moisture measuring means is not particularly limited. For example, a moisture detector using an electrical resistance measurement method or a microwave measurement method, or a foamed aggregate mixture obtained by sampling one part is heated in another place. Thus, it is possible to use a heat loss measuring instrument that evaporates moisture and measures moisture from its weight reduction.

(F) Next, it is determined whether or not the measured moisture W is within the range of the moisture reference value Ws (step S6).

  That is, it is determined whether or not the moisture W of the foamed aggregate mixture is between the upper limit threshold Wsuth and the lower limit threshold Wsdth that are in the range of the reference value Ws of the moisture. The upper threshold value Wsuth and the lower threshold value Wsdth can be set in advance by experiments.

(G) Next, when the measured moisture W is in the range of the moisture reference value Ws, the viscosity V indicating the mixed state of the foamed aggregate mixture is measured by a viscosity measuring means (step S7).

  The viscosity measuring unit is not particularly limited, and a viscosity measuring unit using a probe press-fitting method, a probe rotation torque detection method, a probe press-fitting and rotation torque detection method, or an apparent viscosity measurement method can be used. For example, as the probe press-fitting method, a spherical or cylindrical part is provided at the tip of a rod-like probe (whether this part is integral or separate), and the tip of the probe is used as a foamed aggregate. It can be set as the viscosity detector which measures the load (resistance force) at the time of press-fitting in a mixture, and measures the viscosity of this foamed aggregate mixture relatively. Further, as the probe rotational torque detection method, a spherical or cylindrical part (whether this part is integral or separate) is provided at the tip of the rod-shaped probe, and the tip of this probe is It can be made into a viscosity detector which rotates by press-fitting into the foam aggregate mixture, measures the load (resistance force / torque) generated in the probe, and relatively measures the viscosity of the foam aggregate mixture. Further, as the probe press-fitting and rotational torque detection method, a disc-like or fan-like part (whether this part is integral or separate) is provided at the tip of the rod-like probe, and this probe Then, the tip is pressed into the foam aggregate mixture, and then rotated to measure the load (torque) generated in the probe, whereby a viscosity detector that relatively measures the viscosity of the foam aggregate mixture can be obtained. Furthermore, as a method for measuring the apparent viscosity, the foamed aggregate mixture flows out of the opening by placing the foamed aggregate mixture in a cylindrical body having an opening with a constant diameter and applying a certain pressure to the foamed aggregate mixture. It can be set as the viscosity detector which measures an apparent viscosity relatively by the speed | rate to do. In particular, the apparent viscosity measurement type viscosity detector (viscosity measurement means) is a non-Newtonian fluid, so the probe press-fitting method, rotational torque detection method or press-in and rotational torque detection type viscosity detector (viscosity measurement means) It is preferable to use it.

(H) Next, it is determined whether or not the measured viscosity V is within the range of the viscosity reference value Vs (step S8).

  That is, it is determined whether or not the viscosity of the foamed aggregate mixture is between the upper threshold value and the lower threshold value of the reference value that is the range of the reference value of the viscosity.

(I) Next, when the measured viscosity V is within the range of the viscosity reference value Vs, it is determined that the foamed aggregate mixture is in a normal state (step S9), and molding is started.

(J) In step S6, when the measured moisture W is not within the range of the moisture reference value Ws (threshold values Wsdth, Wsuth), the deficient water is replenished (added). The foamed aggregate mixture is stirred again and kneaded (kneaded) (step S10).

(K) In the step S8, when the measured viscosity V is not within the range of the viscosity reference value Vs (threshold values Vsdth, Vsuth), the foamed aggregate so that a predetermined viscosity is obtained. The mixture is stirred again and kneaded (kneaded) (step S11).

  In the present invention, the temperature, viscosity and moisture of the foamed aggregate mixture are measured by installing the temperature sensor, viscosity detector and moisture detector inside or outside the mixture storage means.

  Further, in the present invention, the temperature and the like are measured by collecting the foam aggregate mixture from the mixture storage means by a batch method, or continuously by attaching the measurement means to the mixture storage means. Can do.

  In the present invention, the viscosity and the quantity of moisture vary depending on the type of the particulate aggregate and the type of the water-soluble binder, so that it is difficult to specify the optimum range. For example, the sand temperature is 0. For ˜40 ° C., the viscosity reference value is 0.5 to 5 Pa · s, and the moisture reference value is 2 to 10 wt%.

  Next, examples of the present invention will be described, but the present invention is not limited to such examples.

Examples In this example, silica sand is used as the particulate aggregate, polyvinyl alcohol (JP-05 manufactured by Nihon Vitamin Bi-Poval), starch (dextrin NSD-L manufactured by Nissi) and citric acid (manufactured by Fuso Chemical) as the water-soluble binder. Was used. Then, with respect to 100 parts by weight of silica sand (flattery sand), 0.2 parts by weight of polyvinyl alcohol, 0.8 parts by weight of starch, 0.4 parts by weight of citric acid and 5 parts by weight of water are stirred and mixed with a mixer, and foamed. I let you. After measuring the amount of citric acid of the water-soluble binder component in the mixture after foaming and confirming that it is within the range of the standard value, the sand temperature is 20 ° C., so the standard value of viscosity is 2 Pa · The reference value for s and moisture was determined to be 4.7 wt%.

  And as a result of measuring the viscosity and the water | moisture content of this mixture, the viscosity was 0.5-3.5 Pa.s and the water | moisture content was 3.5-5.5 wt%. Molding was performed after confirming that these values were sufficiently within the range of the reference values (viscosity threshold value 1.5 and moisture threshold value 3.5). Thereby, it turned out that the filling property at the time of molding can be stabilized by the management method in a present Example.

  Next, the operation of the mold making apparatus for making a mold according to the present invention will be described. As shown in FIG. 1, after the injection holes 13 and 13 are closed by the plugs 23 and 23 of the plug means 22, for example, cinnabar as particulate aggregate and polyvinyl as a water-soluble binder are contained in the mixture storage means 10. Add alcohol and water. Then, the upper end opening of the mixture storage means 10 is closed with the cover 21.

  Next, the motor 17 of the stirring blade mechanism 15 is driven to rotate the stirring blade 16 to mix silica sand, polyvinyl alcohol, and water, and to stir and foam the foamed aggregate mixture.

  Subsequently, the cylinder 19 of the stirring blade mechanism 15 is contracted to raise the stirring blade 16 and the cover 21. And according to the said procedure, after confirming that the property of a foam aggregate mixture is managed in the normal state by the temperature sensor, viscosity detector, and water | moisture content detector which are provided in this mixture storage means 10, plug means 22 The cylinder 25 is contracted and the plugs 23 and 23 are extracted from the injection holes 13 and 13 to open the injection holes 13 and 13.

  Next, the mold pushing mechanism 31 is moved to the left side via the second traveling carriage 32 and the mixture accommodating means 10 is moved to the left side via the first traveling carriage 11, respectively, and the mixture accommodating means 10 is moved to the true position of the heated horizontal split mold 5. Next, the cylinders 2 and 2 are extended to operate and the lower mold 6 is raised through the lifting frame 4 to store the upper mold 7 on the lower mold 6 and the mixture on the upper mold 7. The means 10 are sequentially placed and the lower surface of the mixture storage means 10 is brought into contact with the upper surface of the upper mold 7.

  Next, as shown in FIG. 2, the cylinder 30 of the pressing mechanism 27 is extended to lower the piston 29, and the air between the piston 29 and the mixture is exhausted from the exhaust holes 28, 28 while the piston 29 is being lowered. After the discharge, the upper end openings of the exhaust holes 28 and 28 are closed by a valve means (not shown), and the mixture in the mixture storage means 10 is pressed to press-fill the mixture into the cavity of the horizontal split mold 5. Note that the mixture filled in the horizontal split mold 5 is solidified by evaporation of moisture by the heat of the horizontal split mold 5. After the filling of the horizontal split mold 5 with the mixture is completed, the cylinder 30 is contracted to raise the piston 29. Subsequently, the mold pushing mechanism 31 is moved through the second traveling carriage 32 and the mixture storage means 10 is moved to the first position. The mold pushing mechanism 31 is returned right above the horizontal split mold 5 and the mixture storage means 10 is returned directly below the stirring blade mechanism 15 respectively.

  Next, the cylinder 35 of the mold extruding mechanism 31 is extended to insert the mold extruding pins 33 and 33 into the upper mold 7 and the cylinders 2 and 2 are contracted to lower the lower mold 6 to lower the mold. After separating from the mold 7, the mold is pushed up from the lower mold 6 by a mold pushing mechanism (not shown). On the other hand, required amounts of dredged sand, polyvinyl alcohol, and water are added to the mixture storage means 10 returned just below the stirring blade mechanism 15 for the next mold making.

  In the above embodiment, the mixture in the mixture storage means 10 is press-fitted into the horizontal split mold 5 by the press-fitting method by the press-fitting of the piston 29 of the pressing mechanism 27, but is not limited to this. As shown in FIG. 4, a similar effect can be obtained by a press-fitting method in which the compressed air is used for press-fitting. That is, in the above embodiment, instead of the piston 29, the cover 42 that hermetically closes the upper end opening of the mixture storage means 10 and connects to the compressed air source is attached to the lower end of the piston rod of the cylinder 43 of the pressing mechanism 27. It is also possible to supply compressed air to the upper surface of the mixture in the mixture storage means 10 when the mixture is pressed into the horizontal split mold 5. In this case, the stirring mechanism and the mechanism for press-fitting compressed air may be integrated.

  In the present embodiment, as shown in FIG. 3, since the process starts from step S1 for measuring the amount of water-soluble binder necessary for strength after molding, the management time of the foam aggregate mixture is shortened. The efficiency of workability can be improved and the quality of the mold can be improved.

  However, the present invention is not limited to such an embodiment. For example, even if the measurement step (steps S1 to S3) of the amount of the water-soluble binder is omitted, the water and viscosity can be controlled by repeating management of water and viscosity. After the fact that the amount of the functional binder is found to be insufficient, it is possible to mold the mold by replenishing the insufficient water-soluble binder and managing the moisture and viscosity again, compared with the present embodiment Although the workability is somewhat reduced, the quality of the mold can be improved.

FIG. 1 is a front view of a partially cut section of a mold making apparatus according to the present invention. FIG. 2 is a view for explaining the operation of the mold making apparatus shown in FIG. 1 and shows a state in which the foam aggregate mixture in the mixture storage means is press-fitted into the horizontal split mold. FIG. 3 is a flowchart according to one embodiment of the present invention. FIG. 4 is a partially cutaway front view of another mold making apparatus according to the present invention.

Claims (22)

In forming a mold by filling a foam aggregate mixture obtained by mixing and stirring a particulate aggregate, a water-soluble binder and water into a heated mold cavity by a press-fitting method, the foam aggregate mixture is used. A method for managing a foamed aggregate mixture that is managed in a predetermined normal state, wherein the foamed aggregate mixture is measured by measuring the amount of the water-soluble binder, which is one of the characteristic factors indicating the mixed state of the foamed aggregate mixture. Management method of aggregate mixture. The management method of the foam aggregate mixture of Claim 1 which measures the quantity of the said water-soluble binder by the quantity of carboxylic acid. (A) Based on the temperature property measured when measuring the amount of the water-soluble binder from the relationship between the property properties of the foam aggregate mixture obtained in advance, the property properties of the foam aggregate mixture other than the water-soluble binder Determining a reference value for the characteristic factor to be indicated;
(B) measuring a state of a characteristic factor indicating a mixed state of the foam aggregate mixture other than the water-soluble binder;
(C) determining whether the measured state value is within the range of the reference value;
(D) based on the determination, determining whether the foamed aggregate mixture is in a normal state or adjusting the foamed aggregate mixture;
The management method of the foam aggregate mixture of Claim 1 or 2 containing these. 4. The method for managing a foam aggregate mixture according to claim 3, wherein the characteristic factors other than the water-soluble binder are moisture and viscosity. In forming a mold by filling a foam aggregate mixture obtained by mixing and stirring a particulate aggregate, a water-soluble binder and water into a heated mold cavity by a press-fitting method, the foam aggregate mixture is used. A method for managing a foamed aggregate mixture, which is managed in a predetermined normal state, characterized by measuring moisture and viscosity among characteristic factors indicating a mixed state of the foamed aggregate mixture. Method. (A) determining a moisture and viscosity reference value indicating the property characteristics of the foamed aggregate mixture;
(B) measuring the moisture indicating the mixed state of the foamed aggregate mixture;
(C) determining whether the measured moisture is within the range of the moisture reference value;
(D) a step of measuring a viscosity indicating a mixed state of the foamed aggregate mixture when the measured moisture is within a range of a reference value of the moisture;
(E) determining whether the measured viscosity is within a range of the viscosity reference value;
(F) a step of determining that the foamed aggregate mixture is in a normal state when the measured viscosity is within the range of the reference value of the viscosity;
The management method of the foam aggregate mixture of Claim 5 containing this. The management of the foamed aggregate mixture according to claim 5 or 6, wherein when the measured moisture is not within the range of the reference value of the moisture, the foamed aggregate mixture is kneaded again after supplying a deficient amount of water. Method. The method for managing a foamed aggregate mixture according to claim 5 or 6, wherein the foamed aggregate mixture is kneaded again when the measured viscosity is not within the range of the reference value of the viscosity. The method for managing a foamed aggregate mixture according to claim 5 or 6, wherein the moisture content of the foamed aggregate mixture is measured by a moisture measuring means of an electrical resistance measurement method or a microwave measurement method. The method for managing a foamed aggregate mixture according to claim 5 or 6, wherein the viscosity of the foamed aggregate mixture is measured by a probe press-fitting method, a rotational torque detection method, or a viscosity measurement means of a press-fitting and rotational torque detection method. The method for managing a foamed aggregate mixture according to claim 5 or 6, wherein the measurement of moisture and viscosity of the foamed aggregate mixture is carried out by collecting the foamed aggregate mixture from the foamed aggregate mixture storage means and using a batch method. 6. The method for managing a foam aggregate mixture according to claim 5, wherein the moisture and viscosity of the foam aggregate mixture are continuously measured by attaching measurement means to the foam aggregate mixture storage means. The method for managing a foamed aggregate mixture according to claim 7, wherein the foamed aggregate mixture is kneaded again when the measured viscosity is not within the range of the reference value of the viscosity. When forming a mold by filling a foam aggregate mixture obtained by mixing and stirring a particulate aggregate, a water-soluble binder and water into a cavity of a heated mold by a press-fitting method, the foam aggregate mixture is used. A method for managing a foam aggregate mixture to be managed in a predetermined normal state,
(A) measuring the amount of the water-soluble binder that is one of the characteristic factors indicating the mixing state of the foamed aggregate mixture;
(B) determining whether the amount of the water-soluble binder is within a range of a reference value;
(C) When the measured amount of the water-soluble binder is within the range of the reference value, the temperature measured when measuring the amount of the water-soluble binder from the relationship of the property properties of the foam aggregate mixture obtained in advance. And determining a moisture and viscosity reference value indicative of the property characteristics of the foamed aggregate mixture, and
(D) measuring the moisture indicating the mixed state of the foamed aggregate mixture;
(E) determining whether the measured moisture is within the range of the moisture reference value;
(F) when the measured moisture is within the range of the moisture reference value, measuring the viscosity indicating the mixing state of the foam aggregate mixture;
(G) determining whether the measured viscosity is within the range of the reference value of the viscosity;
(H) a step of determining that the foamed aggregate mixture is in a normal state when the measured viscosity is within the range of the reference value of the viscosity;
A method for managing a foam aggregate mixture, comprising: The method for managing a foamed aggregate mixture according to claim 14, wherein when the measured amount of the water-soluble binder is not within the range of the reference value, a deficient water-soluble binder is supplied and stirred again. The management of the foamed aggregate mixture according to claim 14 or 15, wherein when the measured moisture is not within the range of the reference value of the moisture, the foamed aggregate mixture is kneaded again after supplying a deficient amount of water. Method. The method for managing a foamed aggregate mixture according to claim 14 or 15, wherein the foamed aggregate mixture is kneaded again when the measured viscosity is not within the range of the reference value of the viscosity. The method for managing a foamed aggregate mixture according to claim 14, wherein the moisture content of the foamed aggregate mixture is measured by a moisture measuring means of an electrical resistance measurement method or a microwave measurement method. The method for managing a foamed aggregate mixture according to claim 14, wherein the viscosity of the foamed aggregate mixture is measured by a probe press-fitting method, a rotational torque detection method, or a viscosity measurement means of a press-fitting and rotational torque detection method. The method for managing a foam aggregate mixture according to claim 14, wherein the measurement of the temperature, moisture, and viscosity of the foam aggregate mixture is carried out by collecting the foam aggregate mixture from the foam aggregate mixture storage means and using a batch method. The method for managing a foam aggregate mixture according to claim 14, wherein the measurement of the temperature, moisture, and viscosity of the foam aggregate mixture is continuously performed by attaching measurement means to the mixture storage means of the foam aggregate mixture. The method for managing a foamed aggregate mixture according to claim 16, wherein the foamed aggregate mixture is kneaded again when the measured viscosity is not within the range of the reference value of the viscosity.

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