JP5086819B2 - Foundry sand kneading adjusting device and kneading adjusting method - Google Patents

Description

  The present invention relates to a foundry sand kneading adjusting device and a kneading adjusting method used for forming a green mold for casting.

  In general, in a molding molding line that molds a casting mold (mold), casting sand is kneaded and adjusted by a foundry sand kneading adjusting device, and the kneaded and adjusted casting sand is molded by a molding machine. It becomes. In the casting line, molten metal is poured from the ladle into the green mold, and the green mold after pouring is mold-divided by a mold-balancing machine and collected as foundry sand. Thereafter, the recovered foundry sand (recovered sand) is returned again to the kneading adjusting device of the green mold making line. As described above, foundry sand is used many times through a series of circulation cycles. In this case, new sand (new foundry sand) may be added to the foundry sand kneading adjusting device as necessary.

Heretofore, as a kneading adjusting device and a kneading adjusting method for foundry sand, for example, the one described in Patent Document 1 is known. This foundry sand kneading adjustment device and kneading adjustment method measure the sand height of the foundry sand during kneading with a distance sensor, and the foundry sand kneading state from the correlation between the sand height and the compactability value (CB value). The amount of water deficient in the foundry sand is controlled to be injected by a calculator and a water injector to adjust the kneading of the foundry sand.
JP-A-5-212490

  However, in the kneading adjusting device and kneading adjusting method according to the prior art described above, the amount of water added is controlled based on the correlation between the sand height of the foundry sand being kneaded and the CB value. In some cases, when the temperature of the foundry sand is greatly different, the amount of water added may not be appropriate, and the sand characteristics of the foundry sand after kneading could not be stabilized. That is, the foundry sand that has been left for a long time until the foundry sand kneading adjusting device is in operation, and the foundry sand that has been recovered after mold casting of the mold obtained via the foundry kneading adjusting device (recovered sand) Therefore, when the recovered sand is kneaded and adjusted, the amount of water added is also taken into account when the recovered sand is kneaded and adjusted. There is a problem that the sand characteristics after kneading are not stable.

  The present invention has been made in view of the above-described circumstances. Regardless of whether the foundry sand kneading adjusting device is in operation or not, the foundry sand can be appropriately kneaded and adjusted, It is an object of the present invention to provide a foundry sand kneading adjusting device and a kneading adjusting method capable of stabilizing sand characteristics.

  In order to solve the above-mentioned problem, the invention according to claim 1 is provided with a kneader capable of kneading foundry sand together with water, and the kneading machine provided with the kneading machine temperature and moisture content before kneading in the kneader. First measuring means for measuring, water supply means for supplying water to the foundry sand in the kneader, and control for controlling the amount of water supplied by the water supply means to the foundry sand in the kneader A foundry sand kneading adjusting device comprising: a device; and a second measuring means for measuring a characteristic value of the kneaded foundry sand kneaded in the kneader, wherein the control device includes the first measuring means, Based on the temperature and water content of the foundry sand that has been left until the foundry sand kneading adjustment device is operated, and having a control unit connected to each of the water supply means and the second measuring means, before kneading in the kneader Water supply for foundry sand Casting sand before kneading in the kneading machine based on the first calibration curve for determining the temperature and the water content of the foundry sand recovered after mold casting of the mold obtained via the molding sand kneading adjustment device A second calibration curve for determining the amount of water supply to the control, and the control unit manages the characteristic value according to the characteristic value of the foundry sand after kneading measured by the second measuring means. When it is within the range, the amount of water supply is determined based on the temperature and water content of the foundry sand measured by the first measuring means and the first calibration curve by performing control based on the first calibration curve. In addition, the water supply amount is controlled, and when the characteristic value is out of the management range, or when the characteristic value is continuously out of the management range, the control based on the first calibration curve is based on the second calibration curve. By switching to control, And determines the water supply amount on the basis of the serial temperature and moisture content of molding sand was measured by the first measuring means and to said second calibration curve, and its gist to control the water supply amount.

  According to the first aspect of the present invention, when the foundry sand kneading adjusting device is operated, the foundry sand that has been left until the foundry sand kneading adjusting device is operated is kneaded with water by the kneader. In this case, the amount of water supplied by the water supply means to the foundry sand in the kneader is controlled based on the temperature and moisture content of the foundry sand before kneading measured by the first measuring means and the first calibration curve. Water determined by the control unit of the apparatus and the determined water supply amount is supplied to the foundry sand in the kneader by the water supply means. After the kneading of the foundry sand and water, the kneaded foundry sand kneaded in the kneader has its characteristic value measured by the second measuring means, and according to the characteristic value of the foundry sand measured by the second measuring means, The amount of water supplied to the foundry sand in the kneader is determined and controlled by the control unit. In this case, when the characteristic value of the foundry sand after kneading is within the control range, the control unit performs control based on the first calibration curve, and the temperature and moisture content of the foundry sand measured by the first measuring means A water supply amount is determined based on the first calibration curve, and the water supply amount is controlled. On the other hand, in addition to the foundry sand that was left until the foundry sand kneading adjustment device is operated, or instead of the foundry sand that was left until the foundry sand kneading adjustment device is operated, the foundry sand kneading adjustment device When the foundry sand recovered after mold casting of the mold obtained through the above is kneaded with water in a kneader, the characteristic value of the foundry sand after kneading is out of the control range, or the foundry after kneading Since the characteristic value of sand may deviate continuously from the control range, the characteristic value of the foundry sand after kneading deviates from the control range, or the characteristic value of the foundry sand after kneading continues from the control range. The control unit switches from the control based on the first calibration curve to the control based on the second calibration curve, so that the temperature and moisture content of the foundry sand measured by the first measuring means and the second calibration curve are switched. The water supply amount is determined based on The water supply amount is controlled. As described above, the foundry sand that has been left until the foundry sand kneading adjustment device is operated, and the foundry sand that has been recovered after mold casting of the mold obtained via the foundry sand kneading adjustment device is kneaded. In accordance with the characteristic value of the subsequent foundry sand, the amount of water supply is determined by the control by the control unit based on the first calibration curve or the second calibration curve, and kneading is adjusted in the kneader together with the water of the water supply amount.

A second aspect of the present invention is a method for kneading and adjusting foundry sand using the foundry sand kneading adjusting device of the first aspect of the invention. That is, the method for adjusting kneading of foundry sand according to claim 2 is provided with a kneader capable of kneading foundry sand together with water, and the temperature and moisture of the foundry sand before kneading in the kneader. A first measuring means for measuring the amount, a water supply means for supplying water to the foundry sand in the kneader, and a water supply amount to be supplied by the water supply means to the foundry sand in the kneader. And a second measuring means for measuring the characteristic value of the kneaded foundry sand kneaded in the kneader, wherein the control apparatus comprises the first measuring means, the water supply means, and the second measurement. The water supply amount to the foundry sand before kneading in the kneader is controlled based on the temperature and moisture content of the foundry sand that has been left until the foundry sand kneading adjustment device is operated. First to decide The amount of water to be supplied to the foundry sand before kneading in the kneader is determined based on the weight line and the temperature and moisture content of the foundry sand collected after mold casting of the mold obtained via the foundry kneading adjusting device. And a second calibration curve for adjusting the foundry sand using a foundry sand kneading adjusting device,
In operating the foundry sand kneading adjusting device, the foundry sand which has been left until the foundry sand kneading adjusting device is operated is put into the kneader and the foundry sand before kneading is put into the kneader. The control unit determines the water supply amount based on the temperature and moisture content of the foundry sand measured by the first measurement means and the first calibration curve. In addition, the water supply amount is controlled to supply water from the water supply means to the foundry sand in the kneading machine, and the foundry sand is kneaded with the water in the kneader and then kneaded in the kneader. The characteristic value of the subsequent foundry sand is measured by the second measuring means, and when the characteristic value is within the control range according to the characteristic value of the kneaded foundry sand measured by the second measuring means, The control unit performs control based on the first calibration curve. Thus, the water supply amount is determined based on the temperature and water content of the foundry sand measured by the first measuring means and the first calibration curve, and the water supply amount is controlled, and the characteristic value is managed. When the control value is out of the range or when the characteristic value is continuously out of the management range, the control unit switches from the control based on the first calibration curve to the control based on the second calibration curve, whereby the first measurement is performed. The water supply amount is determined based on the temperature and moisture content of the foundry sand measured by the means and the second calibration curve, and the water supply amount is controlled, and the second calibration from the control based on the first calibration curve. During operation of the foundry sand kneading adjustment device after switching to control based on the line, the control is performed based on the temperature and moisture content of the foundry sand measured by the first measuring means and the second calibration curve. Is the water supply With determining, and the gist thereof to control the water supply amount.

  According to the second aspect of the present invention, when the foundry sand kneading adjusting device is operated, the foundry sand that has been left until the foundry sand kneading adjusting device is operated is put into the kneader and the kneader is also put into the kneader. The temperature and water content of the cast sand before mixing are measured by the first measuring means. The water supply amount is determined by the control unit based on the temperature and water content of the foundry sand measured by the first measuring means and the first calibration curve, and the water supply amount is controlled so that the foundry sand in the kneader is controlled from the water supply means. Is supplied with water. After the foundry sand is kneaded with water in a kneader, the characteristic value of the kneaded foundry sand kneaded in the kneader is measured by the second measuring means, and the foundry sand after kneading is measured by the second measuring means. In accordance with the characteristic value, the amount of water supplied to the foundry sand in the kneader is determined and controlled by the control unit. In this case, when the characteristic value of the foundry sand after kneading is within the control range, the control unit performs control based on the first calibration curve, and the temperature and moisture content of the foundry sand measured by the first measuring means A water supply amount is determined based on the first calibration curve, and the water supply amount is controlled. On the other hand, in addition to the foundry sand that was left until the foundry sand kneading adjustment device is operated, or instead of the foundry sand that was left until the foundry sand kneading adjustment device is operated, the foundry sand kneading adjustment device When the foundry sand recovered after the mold separation of the mold obtained through the process is put into a kneader and kneaded with water, the characteristic value of the foundry sand after kneading is out of the control range, or kneaded Since the characteristic value of the foundry sand after the removal may be continuously out of the control range, the characteristic value of the foundry sand after the kneading is out of the control range, or the characteristic value of the foundry sand after the kneading is within the control range. When the control unit deviates continuously from the first calibration curve, the control unit switches from the control based on the first calibration curve to the control based on the second calibration curve, and the temperature and moisture content of the foundry sand measured by the first measuring means and the second calibration curve. The amount of water supply is determined based on the line Rutotomoni, the water supply amount is controlled. During the operation of the foundry sand kneading adjustment device after switching from the control based on the first calibration curve to the control based on the second calibration curve, the temperature and moisture content of the foundry sand measured by the first measuring means The water supply amount is determined by the control unit based on the second calibration curve, and the water supply amount is controlled. As described above, the foundry sand that has been left until the foundry sand kneading adjustment device is operated, and the foundry sand that has been recovered after mold casting of the mold obtained via the foundry sand kneading adjustment device is kneaded. In accordance with the characteristic value of the subsequent foundry sand, the amount of water supply is determined by the control by the control unit based on the first calibration curve or the second calibration curve, and kneading is adjusted in the kneader together with the water of the water supply amount.

  According to the present invention, it is possible to appropriately knead and adjust the foundry sand regardless of whether the foundry sand kneading adjustment device is in operation or not, and can stabilize the sand characteristics of the foundry sand after kneading. As a result, since the foundry sand can be used many times through a series of circulation cycles, the foundry sand can be effectively used.

  Hereinafter, the foundry sand kneading adjusting device and the foundry sand kneading adjusting method according to the present invention will be described in detail. FIG. 1 is a front view showing an embodiment of a foundry sand kneading adjusting apparatus according to the present invention.

  As shown in FIG. 1, a foundry sand kneading adjusting device 11 includes a kneader 12 capable of kneading foundry sand together with water, and a first measurement for measuring the temperature and moisture content of the foundry sand before kneading in the kneader 12. Means 13 (for example, a sand temperature / moisture measurement sensor), water supply means 14 for supplying water into the kneader 12, and the amount of water supplied to the foundry sand in the kneader 12, that is, water supply means And a control device 15 for controlling the water supply amount 14 and a characteristic value [especially CB value and / or coercive pressure (compressive strength)] of the cast sand after mixing (hereinafter referred to as “mixed sand”). 2 measuring means 16 (for example, sand characteristic value measuring sensor). In addition, it is preferable to use CB value as a characteristic value of foundry sand, and it is more preferable to use CB value and coercive pressure (compressive strength).

  A first measuring means 13 is provided at one side of the kneading machine 12, and a kneading sand hopper 17 and a cutting feeder 18 are provided at the lower part of the kneading machine 12. After the kneaded sand is kneaded and adjusted by the kneader 12, the kneaded sand is discharged from the kneader 12 to the kneaded sand hopper 17 and guided from the kneaded sand hopper 17 to the cutting feeder 18. ing. When the foundry sand is kneaded and adjusted with the kneader 12 together with water, it is preferable to add an additive (for example, bentonite) to the foundry sand in the kneader 12.

  The control device 15 includes a control unit 15 a connected to the first measurement unit 13, the water supply unit 14, and the second measurement unit 16. Further, the control device 15 controls the inside of the kneader 12 based on the temperature and the amount of water of the foundry sand that has been left until the foundry sand kneading adjusting device 11 is operated (the foundry sand that has been left for a long time before kneading). Of the foundry sand (collected sand) recovered after the mold dispersion of the mold (green mold) formed via the first calibration curve 19 for determining the amount of water supply to the foundry sand and the kneading adjusting device 11 for the foundry sand And a second calibration curve 20 for determining the amount of water supplied to the foundry sand in the kneader 12 based on the amount of moisture. The first calibration curve 19 and the second calibration curve 20 are set empirically based on actual data. In addition, the first calibration curve 19 and the second calibration curve 20 are respectively graphs represented by the relationship of the temperature (casting sand temperature) on the horizontal axis and the moisture content (water content required by the casting sand) on the vertical axis. It is.

  The control unit 15a is connected to the first measurement unit 13, the water supply unit 14, and the second measurement unit 16, respectively. Then, information related to the temperature and moisture content of the foundry sand in the kneader 12 measured by the first measuring means 13 is transmitted from the first measuring means 13 to the control unit 15a, and the control unit 15a receives the information and the first information. Based on the calibration curve 19 or the second calibration curve 20, the amount of water supplied from the water supply means 14 into the kneader 12 is calculated (determined), and the water supplied from the water supply means 14 into the kneader 12 is supplied. Control the amount. Further, in the state where the control based on the first calibration curve 19 is performed, information on the characteristic value of the kneaded sand [particularly the CB value and / or the coercive pressure (compressive strength)] measured by the second measuring means 16 is the first 2 When the characteristic value is out of the management range, the control unit 15a immediately switches from the control based on the first calibration curve 19 to the control based on the second calibration curve 20. It has become. Note that the control unit 15a switches from the control based on the first calibration curve 19 to the control based on the second calibration curve 20 when the characteristic value deviates continuously (for example, several times to five times) from the management range. You may do it. Further, the characteristic value is managed in a management range from a target value (Nerai value) to a value of ± 20%, a value of ± 10%, a value of ± 5%, for example.

  Before the foundry sand kneading adjusting device 11 is operated, the hopper 21 contains the foundry sand before kneading that has been left for a long time. This neglected foundry sand is different from foundry sand (collected sand) obtained by mold variation of the mold (green mold) in terms of temperature and / or moisture content and swelling degree. A belt conveyor 22 is provided below the hopper 21, and a bucket conveyor 23 is provided between the belt conveyor 22 and the kneader 12 so as to bridge the both. And the foundry sand before kneading discharged from the hopper 21 is carried to the bucket conveyor 23 by the belt conveyor 22, and the foundry sand before kneading carried to the bucket conveyor 23 is moved from the bottom to the top by the bucket conveyor 23. After that, it is put into the kneader 12. Thereafter, the foundry sand thrown into the kneader 12 is kneaded and adjusted with the kneader 12 together with water, and the kneaded sand is discharged downward from the kneader 12 via the hopper 17 and the cutting feeder 18. ing. In addition, when the characteristic value [especially CB value and / or coercive pressure (compressive strength)] of kneading sand is measured by the 2nd measuring means 16, it is performed outside kneader 12 as mentioned below.

  A belt conveyor 24 is provided below the cutting feeder 18, and second measuring means 16 is provided in the middle of the belt conveyor 24. The kneaded sand discharged onto the belt conveyor 24 is moved from the left to the right by the belt conveyor 24, and the characteristic values [particularly CB value and / or coercive pressure (compressive strength)] are measured by the second measuring means 16. The kneaded sand is guided by a belt conveyor 24 toward a molding machine (not shown).

  Next, an embodiment of a foundry sand kneading adjustment method using the foundry sand kneading adjusting device 11 will be described below with reference to FIGS. FIG. 2 is a process diagram showing a series of circulation cycles of foundry sand.

  First, when the foundry sand kneading adjusting device 11 is operated, the foundry sand before kneading that has been left in the hopper 21 (for a long time) is discharged to the belt conveyor 22 below the hopper 21, and then is moved by the belt conveyor 22. Carry to bucket conveyor 23. Then, the casting sand before kneading carried to the bucket conveyor 23 is moved from the bottom to the top by the bucket conveyor 23 and then put into the kneader 12. At this time, the temperature and water content in the foundry sand before kneading in the kneading machine 12 are measured by the first measuring means 13, and based on the information relating to the temperature and moisture content of the foundry sand and the first calibration curve 19, Control is performed by the control unit 15 a of the control device 15. That is, the control unit 15a calculates the amount of water supplied to the kneading machine 12 (the amount of water supply that is insufficient) based on the information relating to the temperature and moisture content of the foundry sand and the first calibration curve 19. (Determine) and control so that the water supply amount is supplied from the water supply means 14 to the foundry sand in the kneader 12. Then, in the sand kneading step of S21 shown in FIG. 2, the foundry sand in the kneader 12 is kneaded and adjusted with the kneader 12 together with a predetermined amount of water, and the kneaded sand is fed from the kneader 12 to the kneading hopper 17 and The paper is discharged onto the belt conveyor 24 through the cutting feeder 18.

  Thereafter, the kneaded sand discharged onto the belt conveyor 24 is moved from the left to the right by the belt conveyor 24, and the characteristic value [especially CB value and / or coercive force (compressive strength)] of the kneaded sand is measured by the second measuring means 16. In the state where the control based on the first calibration curve 19 is being performed, the control unit 15a determines whether the characteristic value is out of the management range, and the kneaded sand is transferred to the molding machine ( (Not shown) At this time, if the characteristic value of the kneaded sand is not out of the management range, the control by the control unit 15a based on the first calibration curve 19 is continued. In the molding process of S22 shown in FIG. 2, kneaded sand guided to a molding machine (not shown) is used for molding as a mold, and in the pouring process of S23 shown in FIG. Pour hot water. Thereafter, in the mold separating process of S24 shown in FIG. 2, the mold is separated by a mold separating machine (not shown), and in the sand collecting process of S25 shown in FIG. to recover. Since the recovered foundry sand is obtained after mold casting, the temperature is relatively high and the water content is low.

  Next, the process proceeds from the sand collecting step of S25 shown in FIG. 2 to the sand kneading step of S21 shown in FIG. 2 and returns the foundry sand to the foundry sand kneading adjusting device 11. That is, the foundry sand (collected sand) recovered by the recovery device 25 is transported to the hopper 21 and is put into the kneader 12 from the hopper 21 via the belt conveyor 22 and the bucket conveyor 23. The foundry sand (collected sand) recovered by the recovery device 25 is also kneaded by the kneader 12 in the sand kneading step of S21, as in the case of the previously found casting sand. Then, the kneaded sand discharged onto the belt conveyor 24 is moved from the left to the right by the belt conveyor 24, and the second measurement means 16 performs characteristic values of the kneaded sand [especially CB value and / or coercive pressure (compressive strength). In the state where the control based on the first calibration curve 19 is being performed, the control unit 15a determines whether or not the characteristic value is out of the management range, and the kneaded sand is transferred to the molding machine by the belt conveyor 24. Guide to (not shown). At this time, if the characteristic value [especially CB value and / or coercive pressure (compressive strength)] measured by the measuring means 16 is out of the management range, the control unit 15a starts the control based on the first calibration curve 19. The control is immediately switched to the control based on the second calibration curve 20. In other words, the control unit 15a calculates the amount of water supplied to the kneader 12 (the amount of water supply that is insufficient) based on the information related to the temperature and moisture content of the foundry sand and the second calibration curve 20. (Determine) and control so that the water supply amount is supplied from the water supply means 14 to the foundry sand in the kneader 12.

  As described above, according to the foundry sand kneading adjusting device and the kneading adjusting method in the present embodiment, the control unit 15a of the control device 15 based on the first calibration curve 19 according to the characteristic value of the foundry sand after kneading. By immediately switching from the control to the control based on the second calibration curve 20, the foundry sand kneading adjusting device 11 was left until the foundry sand kneading adjusting device was operated regardless of whether the foundry sand kneading adjusting device 11 was in operation or not. It is possible to properly knead and adjust the foundry sand recovered after casting mold and mold casting obtained via the foundry sand kneading adjustment device, and to stabilize the sand characteristics of the kneaded sand discharged from the kneader 12 Can do. In other words, in the foundry sand kneading adjusting apparatus and kneading adjusting method, the casting sand that has been left for a long time is controlled based on the first calibration curve, and is obtained by mold variation after casting the mold. For the foundry sand (recovered sand) to be obtained, the control based on the second calibration curve is performed, so that the kneaded sand having stable sand characteristics [especially CB value and / or coercive pressure (compressive strength)] is formed in S22. To a molding machine (not shown). As a result, the foundry sand can be used many times through a series of circulation cycles (sand kneading step S21, molding step S22, pouring step S23, mold breaking step S24, sand recovery step S25). Effective use of sand can be achieved.

It is a front view which shows one Embodiment of the kneading | mixing adjustment apparatus of the foundry sand which concerns on this invention. It is process drawing which simplifies and shows a series of circulation cycles of foundry sand.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Foundry kneading adjustment apparatus 12 Kneading machine 13 1st measurement means 14 Water supply means 15 Control apparatus 15a Control part 16 2nd measurement means 19 1st calibration curve 20 2nd calibration curve S21 Sand kneading (sand kneading process)
S22 Molding (molding process)
S23 Pouring (pouring process)
S24 type separation (type separation process)
S25 Sand collection (sand collection process)

Claims (2)

A kneader capable of kneading foundry sand with water;
A first measuring means provided in the kneader for measuring the temperature and moisture content of the foundry sand before kneading in the kneader;
Water supply means for supplying water to the foundry sand in the kneader;
A control device for controlling the amount of water supplied by the water supply means to the foundry sand in the kneader;
A foundry sand kneading adjusting device comprising a second measuring means for measuring a characteristic value of the kneaded foundry sand kneaded in the kneader,
The controller is
Based on the temperature and moisture content of the foundry sand that has been left until the foundry sand kneading adjustment device is operated, having a control unit connected to each of the first measuring means, the water supply means, and the second measuring means, The first calibration curve for determining the amount of water supplied to the foundry sand before kneading in the kneader, and the temperature and moisture of the foundry sand recovered after mold casting of the mold obtained via the foundry kneading adjustment device A second calibration curve for determining the amount of water supplied to the foundry sand before kneading in the kneader based on the amount,
The controller is
According to the characteristic value of the foundry sand after kneading measured by the second measuring means,
When the characteristic value is within the control range, by performing control based on the first calibration curve, the temperature and water content of the foundry sand measured by the first measurement means and the first calibration curve Determine the water supply amount and control the water supply amount,
When the characteristic value deviates from the management range, or when the characteristic value deviates continuously from the management range, the control based on the first calibration curve is switched to the control based on the second calibration curve. 2. A foundry sand kneading adjusting apparatus, wherein the water supply amount is determined based on the temperature and water content of the foundry sand measured by the measuring means and the second calibration curve, and the water supply amount is controlled. A kneader capable of kneading foundry sand with water;
A first measuring means provided in the kneader for measuring the temperature and moisture content of the foundry sand before kneading in the kneader;
Water supply means for supplying water to the foundry sand in the kneader;
A control device for controlling the amount of water supplied by the water supply means to the foundry sand in the kneader;
A second measuring means for measuring the characteristic value of the kneaded foundry sand kneaded in the kneader,
The controller is
Based on the temperature and moisture content of the foundry sand that has been left until the foundry sand kneading adjustment device is operated, having a control unit connected to each of the first measuring means, the water supply means, and the second measuring means, The first calibration curve for determining the amount of water supplied to the foundry sand before kneading in the kneader, and the temperature and moisture of the foundry sand recovered after mold casting of the mold obtained via the foundry kneading adjustment device This is a method of kneading and adjusting foundry sand using a foundry sand kneading adjusting device having a second calibration curve for determining the amount of water supplied to the foundry sand before kneading in the kneader based on the amount. And
In operating the foundry sand kneading adjusting device, the foundry sand which has been left until the foundry sand kneading adjusting device is operated is put into the kneader and the foundry sand before kneading is put into the kneader. The control unit determines the water supply amount based on the temperature and moisture content of the foundry sand measured by the first measurement means and the first calibration curve. In addition, the water supply amount is controlled to supply water from the water supply means to the foundry sand in the kneading machine, and the foundry sand is kneaded with the water in the kneader and then kneaded in the kneader. The characteristic value of the subsequent foundry sand is measured by the second measuring means, and when the characteristic value is within the control range according to the characteristic value of the kneaded foundry sand measured by the second measuring means, The control unit performs control based on the first calibration curve. Thus, the water supply amount is determined based on the temperature and water content of the foundry sand measured by the first measuring means and the first calibration curve, and the water supply amount is controlled, and the characteristic value is managed. When the control value is out of the range or when the characteristic value is continuously out of the management range, the control unit switches from the control based on the first calibration curve to the control based on the second calibration curve, whereby the first measurement is performed. Determining the water supply amount based on the temperature and water content of the foundry sand measured by the means and the second calibration curve, and controlling the water supply amount,
During operation of the foundry sand kneading adjustment apparatus after switching from the control based on the first calibration curve to the control based on the second calibration curve, the temperature and moisture of the foundry sand measured by the first measuring means. A method for adjusting kneading of foundry sand, wherein the control unit determines the water supply amount based on the amount and the second calibration curve, and controls the water supply amount.

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