WO2007066509A1 - Method for controlling foamed aggregate mixture - Google Patents

Abstract

A method for controlling a foamed aggregate mixture which comprises monitoring and controlling the conditions of a foamed aggregate mixture to be injected into a metal mold and by which the filling properties of the mixture in molding can be stabilized to enable the production of molds with uniform mold strength. A method for controlling a foamed aggregate mixture which is prepared by mixing a particulate aggregate with a water-soluble binder and water under agitating and which is to be injected into a heated metal mold cavity and formed into a mold, wherein the foamed aggregate mixture is kept in a prescribed normal state by measuring the quantity of the water-soluble binder which is one of the characteristic factors indicating the conditions of the aggregate mixture.

Description

Specification

How to manage foamed aggregate mixture

Technical field

[0001] The present invention relates to a method for managing a foamed aggregate mixture. More specifically, a foamed aggregate mixture made by mixing and stirring particulate aggregate, a water-soluble binder, and water is press-fitted into the cavity of a heated mold to form a mold, such as a main mold or a middle mold. The present invention relates to a method of managing a foamed aggregate mixture for producing the foamed aggregate mixture to a predetermined normal state when molding a molded product or the like.

Background technology

[0002] In recent years, molds have been formed by using a water-soluble binder as a binder for particulate aggregate and hardening the water-soluble binder by evaporating water by heating, because it has good disintegration properties after casting. That's what was suggested!

[0003] An iron molding device for molding this type of iron mold includes, for example, a cylinder extending in the vertical direction, a plunger disposed within the cylinder so as to be movable up and down, and an opening at the lower end of the cylinder that opens and closes the cylinder. A gate is provided so as to be able to be raised and lowered to constitute a means for press-fitting fluidized sand into a mold, and an opening is provided in the middle of the cylinder, and a mixer for obtaining fluidized sand is connected to this opening ( (Refer to Japanese Patent Application Laid-Open No. 55-54241).

[0004] In addition, in the conventional iron molding device described above, a gate is also provided in the middle of the cylinder, or the level of the gate or plunger on the cylinder or lower side is changed, so that the cylinder can be press-fitted into the mold. It is possible to change the amount of fluidized sand that is added.

Disclosure of invention

[0005] However, in the conventional iron molding device, when the water content of the foamed aggregate mixture, which is the mold material, is made using a water-soluble binder as a binding agent, the fluidity of the mixture becomes poor. , Since sufficient filling cannot be ensured, it is necessary to add water and knead further.

[0006] Furthermore, if the viscosity of the foamed aggregate mixture is too high, it is not possible to ensure that the foamed aggregate mixture is sufficiently filled into the mold cavity, so it is necessary to knead it again.

[0007] Therefore, in view of the above-mentioned circumstances, the present invention has been developed to The purpose of the present invention is to provide a method for controlling a foamed aggregate mixture that can produce a foamed aggregate mixture with uniform strength by monitoring and controlling the condition and stabilizing the filling properties during molding.

[0008] The foamed aggregate mixture management method of the present invention involves mixing and stirring a particulate aggregate, a water-soluble binder, and water, and press-fitting the foamed aggregate mixture into a heated mold cavity. A foamed aggregate mixture management method for managing the foamed aggregate mixture to a predetermined normal state when filling and molding a mold, the foamed aggregate mixture being one of the characteristic factors indicating the mixing state of the foamed aggregate mixture. The method is characterized in that the amount of the water-soluble binder is measured.

[0009] Furthermore, the foamed aggregate mixture management method of the present invention involves mixing and stirring a particulate aggregate, a water-soluble binder, and water, and then pouring the foamed aggregate mixture into a heated mold cavity. A foamed aggregate mixture management method for managing the foamed aggregate mixture to a predetermined normal state when molding a mold by filling the foamed aggregate mixture by a press-fitting method, wherein the foamed aggregate mixture shows the mixed state of the foamed aggregate mixture. It is characterized by measuring moisture and viscosity among characteristic factors.

[0010]Furthermore, the foamed aggregate mixture management method of the present invention involves mixing and stirring particulate aggregate, a water-soluble binder, and water, and then introducing the foamed aggregate mixture into a heated mold cavity. A foamed aggregate mixture management method for controlling the foamed aggregate mixture to a predetermined normal state when filling and molding by a press-fitting method, the method comprising: (a) controlling the mixing state of the foamed aggregate mixture; (b) determining whether the amount of the water-soluble binder is within a reference value; (c) If the measured amount of water-soluble binder is within the standard value range, the predetermined relationship between the properties of the foamed aggregate mixture is determined based on the temperature measured when measuring the amount of water-soluble binder. (d) measuring the moisture content indicating the mixing state of the foamed aggregate mixture; (f) if the measured moisture is within the range of the moisture standard, mixing the foamed aggregate mixture; (g) determining whether the measured viscosity is within the range of the viscosity reference value; (h) the measured viscosity is within the viscosity reference range; If the value is within the range, the foamed aggregate mixture is in normal condition. The method is characterized in that it includes a step of determining that the method is in a state.

[0011]According to the present invention, by stabilizing the filling properties during molding, it is possible to manufacture a mold with uniform strength.

BEST MODE FOR CARRYING OUT THE INVENTION

[0012] Hereinafter, a method for managing a foamed aggregate mixture according to the present invention will be explained based on the accompanying drawings. First, as shown in FIGS. 1 and 2, the iron molding device used in the present invention has two upwardly facing cylinders 2, 2 installed on a surface plate-shaped machine base 1, and Four guide rods 3, 3 are set up at the four corners of the stand 1, respectively. Between the upper ends of the piston rods of the two cylinders 2, 2, an elevating frame 4 is installed on the lower surface of the four guide rods 3, 3 so that it can slide and move up and down. A lower mold 6 of a horizontally split mold 5 is attached to the upper surface of the frame 4. Further, directly above the lower mold 6, an upper mold 7 of the horizontally split mold 5 is supported by four sets of support mechanisms 8, 8 mounted above the lower mold 6 on the guide rod 3. It is arranged as follows.

[0013] Furthermore, a ceiling frame 9 extending in the left-right direction is installed between the upper ends of the four guide rods 3, 3, and the lower right position of the ceiling frame 9 has a function as a stirring tank. A mixture storage means 10, which also functions as a press-fit cylinder, is disposed so as to be movable to the left via a first traveling cart 11, and the mixture storage means 10 includes a cylindrical body 12 and a cylindrical body 12. A bottom plate 14 is fixed to the lower end of the liquid to close the opening at the lower end thereof and has a plurality of injection holes 13 through which the mixture is injected, and the bottom plate 14 has a water-cooled structure at the upper part. , and the lower part is made of insulation material.

[0014] In addition, on the right side of the upper surface of the ceiling frame 9, a stirrer for mixing the particulate aggregate, a water-soluble binder that is soluble at room temperature, and water, which are put into the mixture storage means 10, and stirring and foaming the mixture. A vane mechanism 15 is installed. Note that the particulate aggregate may be, for example, silica sand. In addition, the water-soluble binder as a binder for the particulate aggregate may be polyalcohol or a derivative thereof, Z or starch or a derivative thereof, 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 connected to a downward cylinder 19 mounted on the ceiling frame 9. by actuation The stirring blade 16 and the cover 21 are attached to a support member 20 that moves up and down, and a cover 21 that closes the upper end opening of the mixture storage means 10 is attached to the support member 20. It is raised and lowered by the contraction and expansion operation of the cylinder 19.

[0015] In addition, a plug means 22 for closing the injection holes 13, 13 of the mixture storage means 10 is provided at a position directly below the stirring blade mechanism 15 in the ceiling frame 9. In this, a plurality of plugs 23, 23 that can enter and exit the injection holes 13, 13 are attached to the upper end of the piston rod of the cylinder 25, which faces upward, via a support plate 24, and the plugs 23, 23 are attached to the upper end of the piston rod of the cylinder 25, which faces upward. The cylinder 25 is moved up and down by expansion and contraction, and the cylinder 25 is attached to the ceiling frame 9 via support members 26, 26. Note that the injection holes 13, 13 can also be cleaned by inserting a plurality of the plugs 23, 23 into the injection holes 13, 13.

[0016] Further, at a position directly above the horizontally split mold 5 on the upper surface of the ceiling frame 9, there is a mold which presses the mixture in the mixture storage means 10 and releases it from the injection holes 13, 13 of the mixture storage means 10. A pressing mechanism 27 for ejecting is installed, and in the pressing mechanism 27, a piston 29 having a plurality of exhaust holes 28, 28 penetrating vertically is moved up and down by the contraction and expansion of a downward cylinder 30. Te!/, Ru.

[0017] Furthermore, at the left side of the lower part of the ceiling frame 9, a square extrusion mechanism 31 for extruding a square mold from the upper mold 7 is disposed so as to be movable to the right side via a second traveling carriage 32. In the square-shaped extrusion mechanism 31, a plurality of square-shaped extrusion pins 33, 33 are attached to the lower end of the piston rod of the downward-facing cylinder 35 via an extrusion plate 34. , 33 are adapted to move up and down as the cylinder 35 contracts and expands.

[0018] In view of the fact that in order to manufacture a mold with a predetermined quality, it is important to control the foamed aggregate mixture, the present invention provides a method for producing a mold using the foamed aggregate mixture using the molding device. When the foamed aggregate mixture is filled into the heated mold cavity by a press-fitting method to form a mold, the condition of the foamed aggregate mixture before being press-fitted into the mold is monitored and controlled!/ヽru .

[0019] That is, in the present invention, first, the amount of water-soluble binder, which is one of the characteristic factors indicating the mixing state of the foamed aggregate mixture, is measured. Then, it is determined whether the amount of water-soluble binder is within the range of the reference value (for example, between the upper and lower thresholds of the reference value). do. Then, if it is within the range of the standard value, the physical characteristics of the foamed aggregate mixture ( Based on the relationship between water content, viscosity, type and particle size of sand, and type and amount of binder), standard values of characteristic factors indicating the physical characteristics of the foamed aggregate mixture other than the water-soluble binder are determined. The characteristic factor can be, for example, moisture or viscosity.

[0020] Next, after measuring the state of the characteristic factor indicating the mixing state of the foamed aggregate mixture, the measured state value (moisture or viscosity value) is within the range of the reference value (for example, within the upper limit of the reference value, Determine whether or not the value is within the lower limit (a!, da) of the value.

[0021] Then, based on the determination, it is determined whether the foamed aggregate mixture is in a normal state or whether the foamed aggregate mixture is to be adjusted. If it is determined by this judgment that the foamed aggregate mixture is in a normal state, that is, the measured state value is within the standard value range, the foamed aggregate mixture is press-fitted into the heated mold cavity. Fill it and make a mold. On the other hand, if it is determined that the state value measured by adjusting the foamed aggregate mixture is not within the standard value range, the viscosity and Z or moisture components are adjusted, and then the foamed aggregate mixture is adjusted again. Continue monitoring the condition.

[0022] Next, the procedure of the management method according to an embodiment of the present invention will be further explained based on FIG.

[0023] (a) As shown in Figure 3, measure the amount B of water-soluble binder in the foamed aggregate mixture (Step Sl).

[0024] The foamed aggregate mixture is stirred and foamed by mixing particulate aggregate, a water-soluble binder, etc. and water placed in a mixture storage means using a stirring blade mechanism. The granular aggregate may be, for example, silica sand, alumina sand, olivine sand, chromite sand, zircon sand, mullite sand, or various artificial aggregates. In addition, the water-soluble binder as a caking agent for the particulate aggregate includes polyalcohol, for example, polyalcohol or its derivatives with a saponification degree of 80 mol % to 95 mol ^0/0 , and Z or starch _. It can be a saccharide such as or its dielectric. The water-soluble binder is contained in an amount of, for example, 0.3 wt% to 10 wt%, preferably 0.3 wt% to 5 wt%, based on the particulate aggregate. Moreover, water is water other than alkaline water. Water is particulate bone For example, 2~: LOwt% for the material.

[0025] Examples of starches include pregelatinized starch and dextrin derived from potato, corn, tapio, and wheat flour. Examples of starch derivatives include etherified starch, esterified starch and crosslinked starch. Sugar, also known as sucrose, is a sugar made up of one glucose and one fructose bonded together. Examples include caster sugar and granulated sugar. The water-soluble binder used in the present invention is easily available. In addition, pregelatinized starch, dextrin, sugar, etc. are particularly inexpensive. Here, pregelatinized starch, dextrin or its derivatives, saponin, and sugar are soluble in water at room temperature.

[0026] Furthermore, the water-soluble binder of the present invention contains a crosslinking agent that causes a crosslinking reaction, thereby strengthening the bond between the particulate aggregates coated with the water-soluble binder.

[0027] 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, etc., which crosslinks through an ester bond, and methyl beer ether, maleic anhydride, etc. Polymers, such as isobutylene and maleic anhydride copolymers, are compounds that have carboxyl groups when they become an aqueous solution.

. Further, 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 that has a carboxyl group, and that generates less harmful gas during molding or pouring.

[0028] The 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 crosslinking agent is less than 5% by weight based on the water-soluble binder, the effect of the crosslinking reaction will not be sufficient. If the mold is placed in high humidity, it will not be able to maintain sufficient strength. Furthermore, if the amount of crosslinking agent exceeds 300% by weight based on the water-soluble binder, sufficient strength can be maintained when placed under high humidity, but the effect is not different from that of 300% by weight, so Addition of crosslinking agents in amounts greater than 300% by weight is uneconomical and undesirable.

[0029] In the present invention, the crosslinking agent is used as an aqueous solution; for example, in the case of butanetetracarboxylic acid, citric acid, and methyl beer ether monomaleic anhydride copolymer, it is used as an aqueous solution with a concentration of 10% by weight or more. used.

[0030] For measuring the amount B of the water-soluble binder, an appropriate measuring method can be used. The amount of water-soluble binder B is estimated based on the amount of active ingredients among the water-soluble binder components. For example, it can be represented by the amount (concentration) of carboxylic acid. The amount of carboxylic acid can be measured with an analytical device using coulometric detection, high performance liquid chromatography, or the like. For example, concentration is measured using a detector using electrodes and an ion-sensitive membrane under temperature control.

[0031] The carboxylic acids include monocarboxylic acids, dicarboxylic acids, and tricarboxylic acids in which the number of carboxyl groups in the molecule is 1, 2, or 3. Examples of the monocarboxylic acid include acetic acid and lactic acid. Furthermore, examples of dicarboxylic acids include malic acid, oxalic acid, malonic acid, and succinic acid. Furthermore, examples of tricarboxylic acids include citric acid and the like.

[0032] (b) Check whether the amount B of the water-soluble binder is between the upper limit of the standard value range!, the value Bsuth and the lower limit!/, and the value Bsdth. to decide. The upper limit value Bsuth and the lower limit value Bsdth can be set in advance through experiments.

[0033] (c) If the measured amount B is within the range of the standard value, proceed to step S4, and if it is within the range of the standard value, the insufficient water-soluble binder is replenished and stirred (kneaded) again. ) (Step S3).

[0034] (d) Based on the temperature measured when measuring the amount of water-soluble Noinda from the relation of the physical characteristics of the foamed aggregate mixture, which is determined in advance, In this embodiment, reference values Ws and Vs of moisture and viscosity, which particularly affect the quality of the molding, are determined (step S4). The temperature in this step S4 is this temperature when measuring the amount of water-soluble binder under temperature control, and when measuring without temperature control, a separate contact or non-contact method is used. Temperature measurement means include, for example, contact-type temperature detectors such as thermocouple temperature sensors, or non-contact temperature detectors that use lasers, infrared rays (thermography), ultrasonic waves, etc. The temperature measured by the temperature sensor is used.

[0035] Depending on the temperature change, moisture content, and viscosity of the foamed aggregate mixture, the fluidity and porosity of the mixture will change, for example, the filling properties during molding, the strength of the molded product, etc. Since the quality of foamed aggregates differs, the correlation between temperature, moisture content, viscosity, etc. has been determined through experiments as a relationship between the properties of the foamed aggregate mixture. [0036] (e) In step S5, the moisture content W, which indicates the mixing state of the foamed aggregate mixture, is measured by a moisture measuring means (step S5).

[0037] The moisture measuring means is not particularly limited!/, but may include, for example, a moisture detector using an electrical resistance measurement method or a microwave measurement method, or a foamed aggregate mixture sampled in one part. It is possible to use a heating weight loss measuring instrument that evaporates water by heating it in a separate location and measures the water content based on the weight loss.

[0038] (f) Next, it is determined whether the measured moisture W is within the range of the moisture reference value Ws (Step S 6).

[0039] That is, it is determined whether the moisture W of the foamed aggregate mixture is between the upper threshold Wsuth and the lower limit Wsdth, which are the range of the reference value Ws of the moisture. The upper limit threshold value W suth and the lower limit threshold value Wsdth can be set in advance through experiments.

[0040] (g) If the measured moisture W is within the range of the moisture reference value Ws, the viscosity V indicating the mixing state of the foamed aggregate mixture is measured by the viscosity measuring means (Step S7 ).

[0041] The viscosity measuring means is not particularly limited!/, but includes viscosity measurement using a probe press-fitting method, a probe rotational torque detection method, a probe press-fitting and rotational torque detection method, or an apparent viscosity measurement method. Means can be used. For example, in the probe press-fitting method, a spherical or cylindrical part (this part may be an integral part or a separate part) is provided at the tip of a rod-shaped probe, and the tip of this probe is attached to a foamed bone. It can be used as a viscosity detector that relatively measures the viscosity of the foamed aggregate mixture by measuring the load (resistance) when it is press-fitted into the foamed aggregate mixture. In addition, as the probe rotation torque detection method, a spherical or cylindrical part (it does not matter whether this part is integrated or separate) is provided at the tip of a rod-shaped probe. The viscosity detector can be used to relatively measure the viscosity of the foamed aggregate mixture by rotating it while press-fitting the probe into the foamed aggregate mixture and measuring the load (resistance force Z torque) generated on the probe. can. In addition, the probe press-fitting and rotational torque detection method includes providing a disc-shaped or fan-shaped part (this part may be integrated or separate) at the tip of the rod-shaped probe; The tip of this probe is pressed into the foamed aggregate mixture and then rotated. It can be used as a viscosity detector to relatively measure the viscosity of the foamed aggregate mixture by measuring the load (torque) generated on the probe. Furthermore, as an apparent viscosity measurement method, a foamed aggregate mixture is placed in a cylindrical body with an opening of a fixed diameter, and by applying a constant pressure to the foamed aggregate mixture, the foamed aggregate is measured through the opening. It can be a viscosity detector that relatively measures the apparent viscosity based on the rate at which the mixture flows out. In particular, viscosity detectors (viscosity measurement means) that use the apparent viscosity measurement method are used for non-Eutonic fluids, so viscosity detectors (viscosity measurement means) that use the probe press-in method, rotational torque detection method, or press-fit and rotational torque detection method are used. It is preferable to use means).

[0042] (h) Next, it is determined whether the measured viscosity V is within the range of the viscosity reference value Vs (step S8).

[0043] In other words, the viscosity of the foamed aggregate mixture is at the upper limit of the standard value that is the range of the standard value of the viscosity.

Determine whether or not the Vヽ value and the lower limit are between the values.

[0044] (i) If 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. .

[0045] (j) Note that in step S6, if the measured moisture W is not within the range of the moisture reference value Ws (threshold values Wsdth, Wsuth), the insufficient water is removed. The foamed aggregate mixture is replenished (added) and stirred again and kneaded (kneaded) (step S10).

[0046] (k) Furthermore, in step S8, if the measured viscosity V is not within the range (threshold values Vsdth, Vsuth) of the viscosity reference value Vs, a predetermined viscosity is obtained. The foamed aggregate mixture is again stirred and kneaded (kneaded) (step Sl l).

[0047] In the present invention, the temperature, viscosity, and moisture of the foamed aggregate mixture can be measured by installing the temperature sensor, viscosity detector, and moisture detector inside or outside of the mixture storage means. and measure.

[0048] Further, in the present invention, the measurement of the temperature and the like is performed by taking the foamed aggregate mixture from the mixture storage means and using a batch method, or by attaching the measurement means to the mixture storage means. It can be done continuously.

[0049] Furthermore, in the present invention, the viscosity and water content vary by changing the type of particulate aggregate and the type of water-soluble binder, so it is difficult to specify the optimal range. However, for example, when the sand temperature is 0 to 40°C, the standard value for viscosity is 0.5 to 5 Pa's, and the standard value for moisture is 2 to LOwt%.

[0050] Next, examples of the present invention will be described, but the present invention is not limited to these examples.

[0051] Examples

In this example, silica sand was used as the granular aggregate, and polyvinyl alcohol (JP-05 Japan Vinyl Poval Co., Ltd.), starch (Dextrin NSD-L-Sci Co., Ltd.) and citric acid were used as the water-soluble binders. (manufactured by Fuso Igaku) was used. Then, 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 were stirred and mixed with 100 parts by weight of silica sand (flatari sand) using a mixer. and foamed. After measuring the amount of citric acid, a water-soluble binder component, in the mixture after foaming and confirming that it was within the standard value, we determined that the viscosity standard was met since the temperature of the sand was 20°C. The standard value of moisture was determined to be 2 Pa's and 4.7 wt%.

[0052] The viscosity and water content of this mixture were measured, and the viscosity was 0.5 to 3.5 Pa's, and the water content was 3.5 to 5.5 wt%. After confirming that these values were well within the standard range (viscosity threshold of 1.5 and moisture threshold of 3.5), molding was performed. This revealed that the management method in this example made it possible to stabilize the filling properties during molding.

[0053] Next, the operation of the mold forming apparatus for molding a mold according to the present invention will be explained. As shown in FIG. 1, after the injection holes 13, 13 are closed by the plugs 23, 23 of the plug means 22, silica sand as a granular aggregate, water-soluble binder, etc., is placed in the mixture storage means 10. Add polyvinyl alcohol, etc. and water. Then, the upper end opening of the mixture storage means 10 is closed with the cover 21.

[0054] Next, the motor 17 of the stirring blade mechanism 15 is driven to rotate the stirring blade 16, and silica sand, polyvinyl alcohol, etc., and water are mixed, stirred, and foamed to produce a foamed aggregate mixture.

[0055] Subsequently, the cylinder 19 of the stirring blade mechanism 15 is contracted to raise the stirring blade 16 and the cover 21. Then, according to the above procedure, the mixture storage means 10 is provided with After confirming that the properties of the foamed aggregate mixture are under normal control using a temperature sensor, viscosity detector, and moisture detector, the cylinder 25 of the plug means 22 is contracted to inject the plugs 23, 23. It is extracted from the holes 13, 13 and the injection holes 13, 13 are opened.

[0056] Next, the hammer-shaped extrusion mechanism 31 is moved to the left side via the second traveling carriage 32, and the mixture storage means 10 is moved to the left side via the first traveling carriage 11, and the mixture storage means 10 is moved to the left side through the heated horizontal splitter. Transfer it directly above the mold 5, and then extend the cylinders 2 and 2 to raise the lower mold 6 through the lifting frame 4, placing the upper mold 7 on top of the lower mold 6. The mixture storage means 10 are sequentially placed on top of the mold 7, and the lower surface of the mixture storage means 10 is brought into contact with the upper surface of the upper mold 7.

[0057] Next, as shown in FIG. 2, the cylinder 30 of the pressing mechanism 27 is extended to lower the piston 29, and while the piston 29 is descending, the air between the piston 29 and the mixture is discharged from the exhaust hole 28. , 28, the upper end openings of the exhaust holes 28, 28 are closed by valve means (not shown), and the mixture in the mixture storage means 10 is pressed to fit the mixture into the cavity of the horizontally split mold 5. Fill. Note that the mixture filled in the horizontally split mold 5 is solidified by evaporation of moisture by the heat of the horizontally split mold 5. After filling the horizontally split mold 5 with the mixture, the cylinder 30 is contracted to raise the piston 29, and then the cylindrical extrusion mechanism 31 is moved through the second traveling carriage 32 and into the mixture storage means 10. are moved to the right side via the first traveling carriage 11, and the square extrusion mechanism 31 is returned to a position directly above the horizontally split mold 5, and the mixture storage means 10 is returned to a position directly below the stirring blade mechanism 15.

[0058] Next, the cylinder 35 of the cylindrical extrusion mechanism 31 is extended to insert the cylindrical extrusion pins 33, 33 into the upper mold 7, and the cylinders 2, 2 are retracted to lower the lower mold 6. Then, the mold is separated from the upper mold 7, and then the mold is pushed up by the lower mold 6 by a mold extrusion mechanism (not shown). On the other hand, the required amount of silica sand, polyvinyl alcohol, and water are added to the mixture storage means 10, which has been returned directly below the stirring blade mechanism 15, for the next molding.

[0059] In the embodiment described above, the force used to press the mixture in the mixture storage means 10 into the horizontal split mold 5 by the press-fitting method of the piston 29 of the pressing mechanism 27 is not limited to this. Instead, as shown in Figure 4, similar effects can be obtained by using a press-fitting method that uses compressed air. That is, in the embodiment described above, instead of the piston 29, the upper end opening of the mixture storage means 10 is hermetically closed and connected to a compressed air source. A cover 42 is provided at the lower end of the piston rod of the cylinder 43 of the pressing mechanism 27, and compressed air is supplied to the upper surface of the mixture in the mixture storage means 10 when the mixture is press-fitted into the horizontally split mold 5. Good too. Further, in this case, the stirring mechanism and the mechanism for pressurizing compressed air may be integrated.

[0060] In this embodiment, as shown in FIG. 3, since the process starts from step S1 of measuring the amount of water-soluble binder required for strength after molding, it is difficult to manage the foamed aggregate mixture. It is possible to shorten the time, improve work efficiency, and improve the quality of the mold.

[0061] However, the present invention is not limited to the specific embodiments, and even if the step of measuring the amount of water-soluble binder (steps S1 to S3) is omitted, for example, water and After repeating water and viscosity control, it is determined that the amount of water-soluble binder is insufficient, the insufficient amount of water-soluble binder can be replenished, water and viscosity control can be carried out again, and molding can be carried out. Therefore, although the workability is somewhat lower than in this embodiment, the quality of the mold can be improved.

Brief description of the drawing

[0062] FIG. 1 is a partially cutaway sectional front view of the iron molding device according to the present invention.

[Fig. 2] Fig. 2 is a diagram for explaining the operation of the iron molding device shown in Fig. 1, and shows a state in which the foamed aggregate mixture in the mixture storage means is press-fitted into the horizontal split mold.

[Fig. 3] Fig. 3 is a flowchart relating to one embodiment of the present invention.

[Fig. 4] Fig. 4 is a partially cutaway front view of another iron molding device according to the present invention.

Claims

The scope of the claims [1] When molding a mold by filling a foamed aggregate mixture obtained by mixing and stirring particulate aggregate, a water-soluble binder, and water into the cavity of a heated mold by a press-fitting method, the above-mentioned method is used. A foamed aggregate mixture management method for managing a foamed aggregate mixture to a predetermined normal state, the method comprising measuring the amount of the water-soluble binder, which is one of the characteristic factors indicating the mixing state of the foamed aggregate mixture. A method for managing a foamed aggregate mixture, characterized by: [2] The method for managing a foamed aggregate mixture according to claim 1, wherein the amount of the water-soluble binder is measured by the amount of carboxylic acid. [3] (a) Based on the temperature measured when measuring the amount of the water-soluble binder in relation to the properties of the foamed aggregate mixture determined in advance, the amount of foamed aggregate other than the water-soluble binder is determining reference values of characteristic factors indicating the physical characteristics of the aggregate mixture; (b) measuring the state of characteristic factors indicating the mixing state of the foamed aggregate mixture other than the water-soluble binder; (c) determining whether the measured state value is within the range of the reference value; (d) determining whether the foamed aggregate mixture is in a normal state or whether to adjust the foamed aggregate mixture based on the determination; The method for managing a foamed aggregate mixture according to claim 1 or 2, comprising: [4] The method for managing a foamed aggregate mixture according to claim 3, wherein the characteristic factors other than the water-soluble binder are moisture and viscosity. [5] When molding a mold by filling a foamed aggregate mixture obtained by mixing and stirring particulate aggregate, a water-soluble binder, and water into the cavity of a heated mold by a press-fitting method, the above-mentioned method is used. A foaming aggregate mixture management method for controlling a foamed aggregate mixture to a predetermined normal state, the foaming method comprising measuring moisture and viscosity among characteristic factors indicating the mixing state of the foamed aggregate mixture. How to manage aggregate mixtures. [6] (a) determining reference values of moisture and viscosity that indicate the physical properties of the foamed aggregate mixture; (b) measuring the moisture content indicating the mixing state of the foamed aggregate mixture; (c) a step of determining whether the measured moisture is within the range of the moisture standard value; (d) if the measured water content is within the reference water content range, measuring the viscosity indicating the mixing state of the foamed aggregate mixture; (e) determining whether the measured viscosity is within the range of the viscosity reference value; (f) determining that the foamed aggregate mixture is in a normal state if the measured viscosity is within the range of the viscosity reference value; 6. The method of managing a foamed aggregate mixture according to claim 5. [7] The foamed bone according to claim 5 or 6, wherein if the measured water content is not within the range of the reference water content, the foamed aggregate mixture is kneaded again after replenishing the insufficient water. Materials How to manage the mixture. [8] The method for managing a foamed aggregate mixture according to claim 5 or 6, wherein the foamed aggregate mixture is kneaded again if the measured viscosity is not within the range of the reference viscosity value. [9] 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. [10] 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 viscosity measuring means of a press-fitting method using a probe, a rotational torque detection method, or a press-fitting and rotational torque detection method. . [11] The foamed aggregate mixture according to claim 5 or 6, wherein the measurement of the water content and viscosity of the foamed aggregate mixture is carried out in a batch manner by collecting the foamed aggregate mixture. Management method. [12] The method for managing a foamed aggregate mixture according to claim 5, wherein the moisture content and viscosity of the foamed aggregate mixture are continuously measured by attaching a measuring means to the mixture storage means for the foamed aggregate mixture. [13] The method for managing a foamed aggregate mixture according to claim 7, wherein if the measured viscosity is not within the range of the reference viscosity value, the foamed aggregate mixture is kneaded again. [14] A foamed aggregate mixture made by mixing and stirring particulate aggregate, a water-soluble binder, and water is filled into the cavity of a heated mold by press-fitting to form a mold. A method for managing a foamed aggregate mixture for controlling the foamed aggregate mixture to a predetermined normal state, the method comprising: (a) measuring the amount of the water-soluble binder, which 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 reference value; (c) If the measured amount of water-soluble binder is within the standard value range, the predetermined relationship between the properties of the foamed aggregate mixture The temperature measured when measuring the amount of water-soluble binder determining reference values of moisture and viscosity indicating the physical properties of the foamed aggregate mixture based on the (d) measuring the moisture content indicating the mixing state of the foamed aggregate mixture; (e) a step of determining whether the measured moisture is within the range of the moisture standard value; (f) if the measured water content is within the reference water content range, measuring the viscosity indicating the mixing state of the foamed aggregate mixture; (g) a step of determining whether the measured viscosity is within the range of the viscosity reference value; (h) determining that the foamed aggregate mixture is in a normal state if the measured viscosity is within the range of the viscosity reference value; A method for managing a foamed aggregate mixture, comprising: [15] The method for managing a foamed aggregate mixture according to claim 14, wherein if the measured amount of water-soluble binder is not within a reference value range, the insufficient amount of water-soluble binder is replenished and stirred again. [16] The foamed bone according to claim 14 or 15, wherein when the measured water content is not within the range of the reference water content, the deficit water is replenished and then the foamed aggregate mixture is kneaded again. How to manage material mixtures. [17] The method for managing a foamed aggregate mixture according to claim 14 or 15, wherein the foamed aggregate mixture is kneaded again if the measured viscosity is not within the range of the viscosity reference value. [18] Moisture in the foamed aggregate mixture was measured by electrical resistance measurement or microwave measurement. 15. The method for managing a foamed aggregate mixture according to claim 14, wherein the method comprises measuring by means of a method. [19] The method for managing a foamed aggregate mixture according to claim 14, wherein the viscosity of the foamed aggregate mixture is measured by a viscosity measuring means using a probe press-in method, a rotation torque detection method, or a press-fit and rotation torque detection method. [20] The foamed aggregate mixture according to claim 14, wherein the temperature, moisture, and viscosity of the foamed aggregate mixture are measured by taking the foamed aggregate mixture from a mixture storing means for the foamed aggregate mixture and performing a batch method. management method. [21] The method for managing a foamed aggregate mixture according to claim 14, wherein the temperature, moisture, and viscosity of the foamed aggregate mixture are continuously measured by attaching a measuring means to the mixture storage means for the foamed aggregate mixture. . [22] The method for managing a foamed aggregate mixture according to claim 16, wherein if the measured viscosity is not within the range of the reference viscosity value, the foamed aggregate mixture is kneaded again.