JP2009241149A - Treatment method and treatment system of molding sand - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that sand variation occurs due to differences in core weight, casting weight, cooling time, sand composition, and the like, and supply mold sand made uniform by a molding line.
In a processing method of casting sand which collects poured mold sand for each frame and supplies it to a molding line via a sand processing line, information including sand composition is used using model information Im. A step of obtaining sand classification information Isc to be given to the sand, a step of giving the sand classification information Isc to the collected sand for each mold for molding, and one frame of the collected sand to which the sand classification information Isc is given. Each of which is stored in a recovery storage, and a step of taking out the collected sand with sand classification information Isc one frame at a time from the recovery storage and kneading the sand.
[Selection] Figure 1

Description

  The present invention relates to a method and system for processing mold sand used for casting using mold sand. More specifically, the present invention relates to a processing method and processing system for casting sand using model information Im.

Conventionally, in order to provide a sand treatment method for castings that can cope with various types of sand with different compositions recovered from the molding line and obtain uniform sand with no variation in sand quality, the composition changes in the vicinity of the casting. In the processing method of the molding sand, the first sand and the second sand, which is hardly changed in composition at a distance from the casting, are separately collected and circulated to the molding line by another processing line. The sand treatment line for sand includes a step of removing foreign matter, a step of cooling sand, and a main kneading step, and the first sand treatment line is a step of removing foreign matter, a step of cooling sand, and a sub-kneading step. The first sand treatment line is joined to the main kneading step of the second sand treatment line after completion of the sub-kneading step, and is formed upstream of the iron separation step of the first sand treatment line. Join the bypass line from Allowed processing method of the mold sand formed by are known (e.g., see Patent Document 1).
According to the method of Patent Document 1, it is possible to cope with separately separating and collecting sand in the vicinity of the casting and sand separated from the casting.
However, since sand having different core weight, casting weight, cooling time, sand composition, etc. is also mixed in the first sand, it is not always possible to obtain uniform sand without quality variation. There wasn't. There was a similar sand variation problem in the second sand.
As another method, a method has been adopted in which unknown recovered sand is cut into a plurality of storage chambers at regular intervals, and at the time of kneading, a constant and the same amount of sand is simultaneously cut out from each storage chamber to suppress fluctuations in the sand composition. However, the sand composition in the storage chamber is constantly changing, and the composition is unknown, so that a sufficiently uniform sand cannot be obtained in the sand kneading process.

Japanese Patent Laid-Open No. 5-169187, FIG.

  The molding sand processing method and processing system of the present invention solves the problem of sand variation due to differences in core weight, casting weight, cooling time, sand composition, etc., and makes the molding sand more uniform. Is intended to supply to the molding line.

In order to achieve the above object, a method for treating mold sand according to the present invention is a method for treating mold sand that collects poured mold sand for each frame and supplies it to a molding line via a sand treatment line. In the information including the sand composition using the model information Im, the step of obtaining the sand classification information Isc to be given to the sand, the step of giving the sand classification information Isc to the collected sand for each mold to be molded, A step of storing the collected sand to which the sand classification information Isc is added in a collection storage one frame at a time; a step of taking out the collected sand with the sand classification information Isc one frame at a time from the collection storage and kneading the sand; It is characterized by having.
In addition, in order to achieve the above object, the method for treating mold sand according to the present invention is a method for collecting mold sand that has been poured into each frame and supplying the mold sand to the molding line via the sand treatment line. In the processing method, the information including the sand composition using the model information Im, the step of obtaining the sand classification information Isc to be applied to the sand, and the step of applying the sand classification information Isc to the collected sand for each mold to be molded Storing the collected sand with the sand classification information Isc in a plurality of collection storages as the collected sand with the sand classification information Isc, and when the sand is kneaded, from the plurality of collection storages with the different sand classification information Isc It is characterized by having a step of mixing recovered sand in an optimal amount.

Here, “model information Im” in the present invention refers to information unique to a model. A model used when molding a mold is changed depending on a casting to be produced, and various equipment setting values and casting conditions for production differ depending on the model. Information unique to these models is called “model information Im”. For example, when preparing a saddle mold, it is stored in a computer (or programmable controller, hereinafter simply referred to as a computer), and each time a mold is molded, the mold is stored on the computer. It is data given by. The model information Im is data (shift data) that shifts following the mold every time the mold is molded.
The “sand classification information Isc” refers to the characteristics of the collected sand including the sand composition obtained from the model information Im.
That is, the present invention is characterized in that the model information Im is used for the processing of the mold sand. Then, each time a mold as a processing unit is molded from the model information Im, sand classification information Isc is given to the recovered sand, and the mold sand is optimally processed by this information.

  In order to achieve the above-mentioned object, the method for treating mold sand according to the present invention comprises a step of storing the collected sand to which the sand classification information Isc is assigned as a collected sand with sand classification information Isc in a plurality of collection storages, It is characterized by comprising a step of mixing recovered sand with different sand classification information Isc in an optimum amount from the plurality of recovered storages during kneading.

In order to achieve the above object, the method for treating sand molding according to the present invention is characterized in that the collection storage is a cloth hopper. It is effective for preventing adhesion to the hopper to store highly adhering sand with high moisture content.

In order to achieve the above object, a processing system for mold sand according to the present invention includes a computer that assigns sand classification information Isc by model information Im, and a recovery storage that stores the recovered sand to which the sand classification information Isc is assigned. And a kneader for kneading sand along sand classification information Isc assigned to each collected sand.

In order to achieve the above object, the mold sand processing system of the present invention includes a computer that assigns a plurality of sand classification information Isc by model information Im, and a composition to which the plurality of sand classification information Isc is assigned. A plurality of collection storages for separately collecting a plurality of classified sands, a computer for providing a signal for mixing an optimum amount of classified sand from the plurality of collected storages, and an optimum amount mixed along the signals And a kneader for kneading sand.

In order to achieve the above object, the sand processing system according to the present invention has a computer capable of correcting / changing the model information Im and the sand classification information Isc based on the information on the sand processing line and the molding line. And

According to the present invention, since the composition of the recovered sand can be predicted from the sand classification information Isc obtained from the model information Im, it is possible to optimally mix the recovered sand by giving this sand classification information Isc to the recovered sand. Mold sand can be provided to the molding line.

  In addition, since the composition of the collected sand can be predicted from the model information Im, it is possible to optimally mix the collected sand with the sand classification that is given to the collected sand by storing this sand classification information Isc and stored in a plurality of collection storages. Mold sand can be provided to the molding line.

Further, since the collection storage is a cloth hopper, it is possible to obtain an effect that, for example, it is effective for preventing adhesion to the hopper in order to store collected sand having a high adhesion and a large amount of moisture.

Hereinafter, the best mode for carrying out the present invention will be described. The present invention is a method for processing sand for casting, in which poured sand is collected for each frame and supplied to the molding line via the sand processing line, and includes the sand composition using the model information Im. A step of obtaining sand classification information Isc to be given to the sand, a step of giving the sand classification information Isc to the collected sand for each mold for molding, and one frame of the collected sand to which the sand classification information Isc is given. Each of which is stored in a recovery storage, and a step of taking out the collected sand with sand classification information Isc one frame at a time from the recovery storage and kneading the sand.
Here, in the present invention, “sand composition” means the content of basic sand, clay, coal powder, starch, moisture, etc. contained in the mold sand as a component forming the mold sand (raw sand). Or the content ratio. In addition, it refers to the content or content ratio of heat-denatured products (commonly called “Olitex”) and fine powder produced on the surface of sand grains during repeated use of sand.

In the present invention, the "sand processing line" is a facility for casting using raw sand, and after removing the casting material from the mold, the sand forming the mold is crushed to remove foreign matters, The process of adding water and various additives to the sand cut out from the sand storage room, mixing and kneading, and the kneaded sand This refers to the entire equipment having a step of supplying the molding line after loosening the lump (this state is referred to as kneaded sand). A collection storage, a kneader, an additive hopper, a water injection device and the like are included.
“Molding line” is a facility for casting using raw sand. The cast sand is poured into a container consisting of a cast model to be produced and a casting frame for receiving sand, and an external force is applied to the sand to form a mold. A step of combining the mold with the step of placing the core in the mold after molding, a step of injecting molten metal into the mold, a step of solidifying and cooling the injected metal in the mold, and a casting of the cooled casting This refers to the entire equipment formed from the process of removing from the factory. Includes molding machines, automatic water pouring machines, mold ballasts, etc. In addition, equipment for forming a spout cup and a vent hole is usually included in this. There are cases where the mold is transported together with the casting frame, and after the molding, the casting frame is removed and only the mold portion is transported.

Furthermore, “category into a plurality” means that the model information Im is classified into a plurality of states in consideration of the effect on the properties of the collected sand. In particular, the classification is made by paying attention to factors that affect the amount of additive added, the amount of moisture added, the kneading time and the like. For example, recovered sand with a composition with a large amount of core sand compared to other recovered sand, casting weight is larger than other recovered sand, recovered sand affected by large heat, cast compared to other recovered sand It is classified into recovered sand with a small weight and small core weight, and other average recovered sand.
“Category information Ic” refers to an identification code for identifying a plurality of collected sands. In the examples described later, it refers to A, B, C, 1, 2, 3, and the like.
Further, the “sand classification information Isc” refers to the characteristics (Sa · Sb · Sc...) Of the collected sand including the sand composition identified from the model information Im or the classification information Ic.
In the present invention, the collected sand S is classified into SA, SB, SC,... Corresponding to the sand classification information Isc.
“Recovery storage” refers to a storage facility for storing after the sand forming the mold is crushed, foreign matter is removed, water is added, and the mixture is cooled to an appropriate temperature. In the present invention, a storage facility for storing a plurality of collection containers for collecting the collected sand to which the sand classification information Isc is assigned one frame at a time, or a whole constituted by a plurality of storage containers for sorting based on the classification information Ic Indicates.
“Sand kneading” means that the collected sand with sand classification information Isc is taken out from the collected storage one frame at a time, and the collected sand, various additives and moisture are mixed and stirred in order to exhibit sufficient mold performance. In addition, it refers to a process of adding kneading to these components in order to extract the viscosity of the additive (bentonite) as a binder.

Hereinafter, the present invention will be described based on examples. FIG. 1 is a schematic diagram of a sand treatment system and a molding line used in an embodiment of the present invention. In FIG. 1, a casting line 1 includes a molding line 2 (including an automatic pouring machine 3 in some cases) and a sand treatment line 4. Here, the casting line 1 is controlled by a computer system that controls the whole. The computer 5 constituting a part of the computer system gives sand classification information Isc obtained by estimation based on the model information Im to the recovered sand after cooling.
In the sand treatment line 4, the mold is separated by the mold dispersion device 6, and the collected sand S to which the sand classification information Isc is given for each mold is collected in the collection container 7 by one frame, and the foreign matter is sieved. The collection container 7 and the collection container 7 are stored in the collection storage 10 via the dividing device 8 and the sand cooler 9.
Here, the sand classification information Isc is shifted as unique information (shift data) for each mold until after the mold separating process by the mold separating apparatus 6. In addition, after the mold separation, the recovery storage 10 passes through the sieving device 8 and the sand cooler 9 one frame at a time, so that shift data can be specified.
Further, the sand treatment line 4 has a kneader 11 for kneading the collected sand S that is fed from the collection storage 10 by one frame.
Further, the computer 5 gives a signal for performing optimum kneading to the kneading machine 11 based on the sand classification information Isc.
The sand classification information Isc can also be used for predicting the cooling water injection amount of the sand cooler 9.
Here, FIG. 2 is a figure which shows an example of the model information Im used for the sand treatment system of this invention. The model information Im can include not only information for changing the equipment to an optimum state in accordance with the production item in the molding line but also unique information about the casting. The model information Im includes the production required quantity or the required mold forming quantity, product weight, product material, molten metal injection temperature, casting weight, core weight or core sand volume expected to be mixed into the collected sand, core. This includes the molding process and the cooling time of the molten metal in the mold. In an actual system, a plurality of them can be selected. Specific information of the casting includes a core molding process, product name, yield, gas hole position / number, gate position / number, and the like.

Hereinafter, the movement when these configurations are used will be described. FIG. 3 is a flowchart of the sand treatment method of the present invention.
First, using the model information Im, sand classification information Isc including the sand composition and imparted to the sand is obtained.
Next, the sand classification information Isc is given to the collected sand for each mold for molding. As a result, sand classification information Isc is assigned to each mold to be molded, and this sand classification information Isc corresponds to the collected sand for each mold.
Here, the model information Im is data given to the mold on the computer 5 every time the mold is molded, and follows the data (shift data) that shifts following the mold every time the mold is molded or the mold. This is data assigned to the storage means (barcode or the like). Therefore, the sand classification information Isc is also stored in the computer and shifted using the model information Im. The model information Im can be stored in the computer 5 when preparing the saddle shape.
Then, the collected sand S (sand SA having a sand composition and sand SB, SC having another sand composition) collected and transported with the sand classification information Isc is collected and stored for each frame. 10 is stored as recovered sand S with sand classification information Isc. Accordingly, in the collection storage 10, collected sand (SA, SB, SC,...) Having different sand classification information Isc (Sa, Sb, Sc...) Is collected in the collection container 7 one frame at a time. Are stored in a mixed state.
At the time of sand kneading, the collected sand S with the sand classification information Isc is fed into the kneader 11 from the collection storage 10 by one frame by a conveying means (not shown).
In addition, the computer 5 gives the kneader 11 a signal for performing optimum kneading based on the sand classification information Isc.

Furthermore, since the kneading machine 11 is connected to the molding machine 12, the additive hopper 13, and the water injection device 14 through the conveying line, the kneading machine 11 can obtain sand and additives (for example, an optimum amount) according to a signal command. Bentonite, seacoal, starch, fresh sand) and water as needed. In this way, uniform sand without variation is obtained.

As is clear from the above description, the present invention can predict the sand composition of the collected sand from the model information Im, so that it is possible to perform optimum kneading by providing the collected sand with the sand classification information Isc obtained from the model information Im. , Uniform mold sand can be provided to the molding line.

  The model information Im preferably includes the core weight. According to this, the amount of core sand mixed in the recovered sand can be predicted, and the additive and moisture addition amounts can be optimized.

In addition, the model information Im may include the casting weight. According to this, the burnout amount and sand temperature of the additive in the kneaded sand due to the molten metal can be predicted, and the additive and moisture addition amount can be optimized.

Furthermore, the model information Im may include a cooling time. According to this, the burnout amount and sand temperature of the additive in the kneaded sand due to the molten metal can be predicted, and the additive and moisture addition amount can be optimized.
At the time of sand kneading, the additive and moisture from the additive hopper can be added using the sand classification information Isc. According to this, the sand composition that has been unknown at the time of recovery can be made known, and the amount of additive and water added can be optimized.

Further, since the sand classification information Isc includes information on the thermal effect of the recovered sand S, it is possible to estimate the sand temperature, so that it can be used for predicting the cooling water injection amount of the sand cooler 9.

The collection storage 10 may be a cloth hopper 15 as shown in FIG. The cloth hopper 15 shown in FIGS. 4 and 5 is positioned below the hopper 17, a frame 16 assembled in a box shape with a steel mold, a hopper 17 attached to the frame 16, and the hopper 15. The belt conveyor 18 is attached to the frame 16.
The hopper portion 17 is formed of a polyester fiber cloth, and the shape thereof is an inverted trapezoidal shape in which both sides in the longitudinal direction become narrower toward the belt conveyor 18, and the upper and lower sides of the hopper portion are open. It has become.
Usually, since such a hopper has a hopper portion made of an iron plate, the weight of the hopper is increased, and a great deal of force is required for handling. Since the hopper portion is made of cloth this time, the weight of the hopper is reduced, handling becomes easy, and it can be used as the collection storage 10 of the present invention.
In addition, since it is made of cloth, the adhesion of sand to the hopper is reduced, so that it is effective for storing recovered sand with high adhesion and high water content. The cloth hopper 15 shown in FIGS. 4 and 5 has a belt conveyor attached to the bottom of the hopper portion 17 for cutting out the collected sand. However, the method of cutting out the collected sand may be a valve method, a gate method, a vibration feeder, or the like. It is good also as the mechanism of.

When the automatic pouring machine 3 is used, the injection weight, which is one of the model information Im, can be replaced with the injection weight of the molten metal actually injected into the mold. According to this, since the exact injection weight of molten metal by actual measurement value can be shifted, it is possible to predict the burnout amount and sand temperature of the additive in the kneaded sand more precisely and the amount of additive and moisture added. Can be quickly and reliably optimized.

Furthermore, if the information from the kneading machine 11 (moisture content of the collected sand after kneading, sand temperature, kneaded sand amount, etc.) is taken into the computer 5, the sand classification information Isc can be corrected or changed based on the contents and the model information Im. Thus, it is possible to predict the molding conditions (molding sand charging pressure, charging time, compression pressure, compression time, etc.) of the molding machine 12 that are optimal for the supplied kneaded sand, and stable mold molding becomes possible.

Also, if the information from the molding machine 12 (molding sand injection pressure, injection time, compression pressure, compression time, mold thickness, etc.) is taken into the computer 5, the sand classification information Isc can be corrected or modified based on the contents and model information Im. The change can be made, the conditions of the kneading sand necessary for molding can be predicted, and the condition setting for the kneading machine 11 can be optimized. In particular, if the thickness of the mold and the properties of sand used for molding (particularly compactability) can be grasped, the sand classification information Isc can be corrected and changed by their relationship and model information Im, and the optimum kneaded sand required for molding is optimal. Predict conditions.

Next, recovered sand with different sand classification information Isc is stored in a plurality of recovered storages according to another embodiment, and an optimum amount of recovered sand with different sand classification information Isc is stored from the plurality of recovered storages during sand kneading. A method for treating foundry sand, which is a step of mixing in step 1, will be described.
FIG. 6 is a schematic diagram of a sand treatment system and a molding line used in an embodiment of the present invention. In FIG. 5, the casting line 21 includes a molding line 22 (including an automatic pouring machine 23 in some cases) and a sand processing line 24. Here, the casting line 21 is controlled by a computer system that controls the whole. The computer 25 constituting a part of the computer system gives sand classification information Isc obtained by estimating the sand classification based on the model information Im to the recovered sand after cooling.
Further, in the sand processing line 24, the mold is separated by the mold separating apparatus 26, and the collected sand S to which the sand classification information Isc is given for each mold is conveyed by the conveyor 27 and collected separately. 28 separately collected.
Here, the sand classification information Isc is shifted as unique information (shift data) for each mold until the mold separating process by the mold separating apparatus 26. Further, after the mold separation, the distance to the collected sand storage 28 by the conveyor 27 can be specified by the time required for the collected sand storage 28 after the mold separation and the order of the shift data to be maintained.
The computer 25 also provides a signal to mix the optimal amount of sorted sand from the multiple collection storages 28. Moreover, the sand processing line 24 has a kneader 31 for kneading sand mixed in an optimum amount along this signal via a conveyor 29 and a bucket elevator 30.

Here, FIG. 7 is a figure which shows an example of the model information Im used for the sand treatment system of this invention. The model information Im can include not only information for changing the equipment to an optimum state in accordance with the production item in the molding line but also unique information about the casting. Model information Im includes production required quantity or mold forming required quantity, product weight, molten metal injection temperature, casting weight, core weight or core sand amount expected to be mixed in recovered sand, core molding process, It includes the cooling time of the molten metal in the mold, product material, etc. In an actual system, a plurality of these can be selected. Specific information of the casting includes a core molding process, product name, yield, gas hole position / number, gate position / number, and the like.

Hereinafter, the movement when these configurations are used will be described. FIG. 8 is a flowchart of the sand treatment method of the present invention.
First, using the model information Im, the classification information Ic for dividing the sand composition into a plurality of pieces and the sand classification information Isc to be given to the sand is obtained. FIG. 9 is a schematic diagram for explaining the sand classification information Isc used in the sand treatment system of the present invention. Here, the recovered sand is classified by paying attention to factors that affect the amount of additive, the amount of moisture, the kneading time, and the like. The factors include core weight, casting weight (injection weight), cooling time, and the like.
That is, for example, in the model information Im shown in FIG. 7, the sand composition is divided into a plurality of parts by paying attention to the core weight and the casting weight. The number of sections is preferably 3 to 10. Here, an example divided into four will be described. Sand classification information Isc (Sa, Sb, Sc, Sd) for assigning classification information Ic (A, B, C, D) to sand is obtained in the computer. For example, SA is a recovered sand having a composition with much core sand compared to other recovered sand, SB has a larger cast weight than other recovered sand, and is a recovered sand that is greatly affected by heat, SC The collected sand is smaller in weight than the other collected sand and the core weight is small, and SD is other average collected sand.
Next, the sand classification information Isc is given to the collected sand for each mold for molding. As a result, sand classification information Isc is assigned to each mold to be molded, and this sand classification information Isc corresponds to the collected sand for each mold.
Here, the model information Im is data given to the mold on the computer 25 every time the mold is molded, and is data that shifts following the mold every time the mold is molded (shift data).
Therefore, the sand classification information Isc is also stored in the computer and shifted using the model information Im. The model information Im can be stored in the computer 25 when preparing the saddle shape.
A plurality of recovered sands S (sand SA having a sand composition and sands SB and SC having another sand composition) that are provided with the sand classification information Isc and collected and conveyed by the conveyor 27 are recovered. Stored in the storage 28A, 28B, 28C as recovered sand with sand classification information Isc. In FIG. 5, which is an example, since there are only three collection storages, the average collection sand SD is judged to be the closest sand composition to SA, SB, or SC, and either Collect by collecting into collection storage. Of course, this system can be configured by changing the number of collection storages.
A conveyor 29 is provided below the collection storages 28 </ b> A, 28 </ b> B, 28 </ b> C, and the end point of the conveyor 29 is connected to a kneader 31 via a bucket elevator 30.
And at the time of sand kneading | mixing, the collection | recovery sand with different sand classification information Isc is mixed with the optimal quantity from said some collection | recovery storage. Mix the optimal amount of classified sand from the multiple collection storages 28A, 28B, 28C. For this purpose, for example, a command such as “SA is 10 units, SB is 8 units, SC is 6 units” is sent from the computer 25 in order to mix the optimum amount of classified sand from the plurality of collection storages 28. give.

Furthermore, since the kneading machine 31 is connected to the conveyor 33 connected to the molding line 22, the additive hopper 34, and the water injection device 35, the kneading machine 31 is adapted to sand and additives (for example, bentonite) in accordance with a signal command. , Seacoal, starch, fresh sand) and water if necessary. In this way, uniform sand without variation is obtained.

Here, the sand classification information Isc is shifted as unique information (shift data) for each mold until the mold separating process by the mold separating apparatus 26. Further, after the mold separation, the distance to the collected sand storage 28 by the conveyor 27 can be specified by the time required for the collected sand storage 28 after the mold separation and the order of the shift data to be maintained.
However, when a process with a large staying layer is provided, such as a cooling drum after mold separation, the sand before and after may be mixed, and in this case, the order of the data shifted to the mold breaking process is changed in the staying layer. The accuracy of the classification information Ic may be reduced.
In this case, an additive (such as bentonite) can be added by an additive hopper 34B at an earlier stage (before the collected sand is mixed).
The present invention is not limited to the lot size when a certain product is continuously produced. Note that the present invention can be realized even when the minimum number of lots is one.

As apparent from the above description, since the composition of the recovered sand can be predicted from the model information Im, the present invention provides this sand classification information Isc to the recovered sand and stores it in a plurality of recovery storages. Can be mixed optimally, and uniform mold sand can be provided to the molding line.

  The model information Im may include the core weight. According to this, the amount of core sand mixed in the recovered sand can be predicted, and the amount of additive and moisture added can be optimized.

In addition, the model information Im may include the casting weight. According to this, the burnout amount and sand temperature of the additive in the kneaded sand due to the molten metal can be predicted, and the additive and moisture addition amount can be optimized.

Furthermore, the model information Im may include a cooling time. According to this, the burnout amount and sand temperature of the additive in the kneaded sand due to the molten metal can be predicted, and the additive and moisture addition amount can be optimized.
At the time of sand kneading, the additive and moisture from the additive hopper can be added using the sand classification information Isc. According to this, the sand composition that has been unknown at the time of recovery can be made known, and the amount of additive and water added can be optimized.

The collection storage 28 may be a cloth hopper 15 as shown in FIG. The cloth hopper 15 shown in FIGS. 4 and 5 is positioned below the hopper 17, a frame 16 assembled in a box shape with a steel mold, a hopper 17 attached to the frame 16, and the hopper 15. The belt conveyor 18 is attached to the frame 16.
The hopper portion 17 is formed of a polyester fiber cloth, and the shape thereof is an inverted trapezoidal shape in which both sides in the longitudinal direction become narrower toward the belt conveyor 18, and the upper and lower sides of the hopper portion are open. It has become.
Usually, since such a hopper has a hopper portion made of an iron plate, the weight of the hopper is increased, and a great deal of force is required for handling. Since the hopper portion is made of cloth this time, the weight of the hopper is reduced, handling becomes easy, and it can be used as the collection storage 28 of the present invention.
In addition, since it is made of cloth, the adhesion of sand to the hopper is reduced, so that it is effective for storing recovered sand with high adhesion and high water content. The cloth hopper 15 shown in FIGS. 4 and 5 has a belt conveyor attached to the bottom of the hopper portion 17 for cutting out the collected sand. However, the method of cutting out the collected sand may be a valve method, a gate method, a vibration feeder, or the like. It is good also as the mechanism of.

When the automatic pouring machine 23 is used, the injection weight, which is one of the model information Im, can be replaced with the actually injected injection weight. This makes it possible to shift the exact injection weight based on the measured values, so that the amount of burnout and sand temperature due to the molten metal of the additive in the kneaded sand can be predicted more precisely, and the amount of additive and moisture added can be quickly and reliably determined. Can be optimized.

In this embodiment, the computers 5 and 25 may be integrated or distributedly controlled. In addition, the number of collection storage is not limited. Furthermore, the method for obtaining the sand classification information Isc from the model information Im is not limited to the method of this embodiment.

It is the schematic which shows the sand treatment system and molding line of this invention. It is the schematic which shows an example of the model information Im used for the sand treatment system of this invention. It is a flowchart of the sand processing method of the Example of this invention. It is an example of the cloth hopper of the present invention. It is a side view of the cloth hopper shown in FIG. It is the schematic which shows another Example of the sand treatment system and molding line of this invention. It is the schematic which shows another example of the model information Im used for the sand processing system of this invention. It is a flowchart of the sand processing method of another Example of this invention. It is the schematic explaining another example of the sand division information Isc used for the sand processing system of this invention.

Explanation of symbols

2, 22 Molding line 4, 24 Sand treatment line 5, 25 Computer 10 Collection storage 11, 31 Kneading machine 15 Cloth hopper
Im model information
Isc (Sa, Sb, Sc ...) Sand classification information S (SA, SB, SC ...) Recovery sand Sr Mold sand 28, 28A, 28B, 28C Recovery storage

Claims (10)

In the mold sand processing method of collecting poured mold sand for each frame and supplying it to the molding line through the sand processing line,
The information including the sand composition using the model information Im, the step of obtaining the sand classification information Isc to be given to the sand,
A step of applying this sand classification information Isc to the collected sand for each mold for molding,
Storing the collected sand to which the sand classification information Isc is attached in a collection storage for each frame;
A step of taking out the collected sand with sand classification information Isc from the collected storage one frame at a time, and kneading the sand;
A method for treating mold sand, comprising: 2. The mold sand processing method according to claim 1, wherein the model information Im includes a core weight. 3. The mold sand processing method according to claim 2, wherein the model information Im includes a casting weight. 4. The method for processing mold sand according to claim 3, wherein the model information Im includes a cooling time. Storing the collected sand provided with the sand classification information Isc as a collected sand with sand classification information Isc in a plurality of collection storages;
2. The method for treating foundry sand according to claim 1, further comprising a step of mixing recovered sand with different sand classification information Isc in an optimum amount from the plurality of recovered storages during sand kneading. 6. The method for treating mold sand according to claim 1, wherein the collection storage is a cloth hopper. The method for treating mold sand according to any one of claims 1 to 5, wherein an additive and moisture from an additive hopper are added using sand classification information Isc during the sand kneading. A computer for assigning sand classification information Isc by model information Im;
A collection storage for storing the collected sand provided with the sand classification information Isc;
A kneader for kneading sand along sand classification information Isc assigned to each collected sand;
A molding sand processing system characterized by comprising: A computer for giving a plurality of sand classification information Isc by model information Im;
A plurality of collection storages for separately collecting a plurality of sands composed of a composition provided with the plurality of sand classification information Isc;
A computer that provides a signal to mix the optimal amount of sorted sand from the multiple collection storages;
A kneader for kneading sand mixed in an optimum amount along the signal;
A molding sand processing system characterized by comprising: The mold sand processing system according to claim 8 or 9, further comprising a computer capable of correcting / changing the model information Im and the sand classification information Isc based on each information of the sand processing line and the molding line.