US20210031259A1 - Green sand mold molding sensor and green sand mold moldability evaluation method - Google Patents

Green sand mold molding sensor and green sand mold moldability evaluation method Download PDF

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Publication number
US20210031259A1
US20210031259A1 US17/042,231 US201917042231A US2021031259A1 US 20210031259 A1 US20210031259 A1 US 20210031259A1 US 201917042231 A US201917042231 A US 201917042231A US 2021031259 A1 US2021031259 A1 US 2021031259A1
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United States
Prior art keywords
green sand
casting mold
sand mold
mold molding
pressure
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US17/042,231
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English (en)
Inventor
Takato Ishii
Hisashi Harada
Yasuaki Asaoka
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Sintokogio Ltd
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Sintokogio Ltd
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Assigned to SINTOKOGIO, LTD. reassignment SINTOKOGIO, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ASAOKA, YASUAKI, HARADA, HISASHI, ISHII, Takato
Publication of US20210031259A1 publication Critical patent/US20210031259A1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/02Sand moulds or like moulds for shaped castings
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C15/00Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/02Compacting by pressing devices only
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C19/00Components or accessories for moulding machines
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C19/00Components or accessories for moulding machines
    • B22C19/04Controlling devices specially designed for moulding machines
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C21/00Flasks; Accessories therefor
    • B22C21/12Accessories
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C23/00Tools; Devices not mentioned before for moulding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C7/00Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/04Pattern plates
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes

Definitions

  • the present invention relates to a green sand mold molding sensor that evaluates the moldability of a green sand mold molded by a casting mold molding machine.
  • One of the indicators for evaluating the quality demanded of a green sand mold (casting mold) molded by a casting mold molding device is casting mold strength.
  • work is carried out to measure each molded green sand mold individually using a casting mold strength gauge.
  • a method for confirming whether a molded green sand mold has sufficient casting mold strength without having to perform such work is desired.
  • a method for managing the casting mold quality of each molded green sand mold without stopping a process is desired.
  • Patent Document 1 discloses a method for detecting abnormalities in blowing in and loading of casting sand in a blow-in type casting mold molding machine, wherein an internal pressure is measured by a pressure sensor in order to detect abnormalities in blowing in and loading of casting sand.
  • Patent Document 2 discloses a molding device monitoring system which discovers defective casting molds by using position sensors for measuring positions of flask-setting cylinders, filling-flask cylinders, and a leveling frame to monitor the height of a parting plane of a casting mold.
  • Patent Document 1 JP 3415497 B
  • Patent Document 2 JP 3729197 B
  • the method for detecting abnormalities in blowing in and loading of casting sand of Patent Document 1 is capable of detecting sand loading defects only and it is difficult to confirm the precise casting mold strength. Further, even if the molding device monitoring system of Patent Document 2 monitors the height of the parting plane of the casting mold, it is difficult to confirm the precise casting mold strength from the height of the parting plane.
  • the present invention was achieved in light of the foregoing and has the objective of providing a green sand mold molding sensor that, in order to determine the quality of a molded green sand mold, can measure pressure applied to a pressing surface of a squeeze board or squeeze feet that compresses the green sand.
  • the green sand mold molding sensor of the present invention comprises a pressure sensor for evaluating the moldability of a green sand mold molded by a casting mold molding machine, wherein the pressure sensor is embedded in a squeeze board or squeeze feet that compresses green sand.
  • the squeeze board or squeeze feet is a member that constitutes a part of a boundary of a molding space defined by the squeeze board or squeeze feet and a metal flask during green sand mold molding by the casting mold molding machine.
  • a pressure-receiving surface of the pressure sensor and a surface of the squeeze board or squeeze feet are in a flush state.
  • the squeeze board or squeeze feet and a plate having attached thereto a pattern arranged facing the squeeze board or squeeze feet are provided, the pressure sensor being embedded in the squeeze board or squeeze feet at a corresponding position between the metal flask and the pattern.
  • the squeeze board is configured to be rectangular, a plurality of the pressure sensors are provided, and these pressure sensors are embedded in the four corners of the squeeze board.
  • an arrangement of the squeeze feet is configured to be rectangular, a plurality of the pressure sensors are provided, and these pressure sensors are embedded in any of the squeeze feet including the squeeze feet in the four corners.
  • the pressure sensor is fixed to the squeeze board or squeeze feet by a screwing means.
  • the pressure sensor is a fluid sensor.
  • the size of the pressure-receiving surface of the pressure sensor is 5-30 mm in diameter.
  • a method for evaluating green sand mold moldability in the present invention evaluates the moldability of a green sand mold molded by a casting mold molding machine by using a green sand mold molding sensor provided with a pressure sensor embedded in a squeeze board or squeeze feet that compresses green sand.
  • the present invention provides an effect wherein, in order to determine the quality of a molded green sand mold, it is possible to measure pressure applied to a pressing surface of a squeeze board or squeeze feet that compresses green sand.
  • FIG. 1 represents a schematic of a structure of a casting mold molding device using green sand mold molding sensors according to a first embodiment.
  • FIG. 2 represents a configuration of a portion of a casting mold molding device, wherein the portion evaluates casting mold quality.
  • FIG. 3 is a cross-section view representing details of a portion of a squeeze board having green sand mold molding sensors embedded therein.
  • FIG. 4 is a cross-section view representing details of a portion of a squeeze board having green sand mold molding sensors embedded therein.
  • FIG. 5 is a block diagram representing one example of a functional configuration of a casting mold quality evaluation device.
  • FIG. 6 is a block diagram representing another example of a functional configuration of a casting mold quality evaluation device.
  • FIG. 7 is a schematic view representing a configuration of an experiment carried out herein, ( a ) being cross-section view and ( b ) being a plan view of a squeeze board.
  • FIG. 8 is a graph representing one example of results obtained by recording, in an integrated amplifier-recorder, temporal changes in the pressure of a green sand mold molding sensor in a squeezing step and analyzing by computer.
  • FIG. 9 is a graph summarizing a relationship between peak pressure of a green sand mold molding sensor and casting mold strength.
  • FIG. 10 shows one example of a screen displayed on a display unit.
  • FIG. 11 shows one example of a screen displayed on a display unit.
  • FIG. 12 shows one example of a screen displayed on a display unit.
  • FIG. 13 shows steps in a method for evaluating casting mold quality (method for molding a green sand mold) using the casting mold molding device according to the first embodiment.
  • FIG. 14 shows another example of a squeeze board having green sand mold molding sensors embedded therein.
  • FIG. 15 shows another example of a squeeze board having green sand mold molding sensors embedded therein.
  • FIG. 16 represents a schematic of a structure of a casting mold molding device using green sand mold molding sensors according to a second embodiment.
  • FIG. 17 represents a configuration of a portion of a casting mold molding device, wherein the portion evaluates casting mold quality.
  • FIG. 18 shows steps in a method for evaluating casting mold quality (method for molding a green sand mold) using the casting mold molding device according to the second embodiment.
  • FIG. 19 shows another example of a squeeze board having green sand mold molding sensors embedded therein.
  • FIG. 20 shows another example of a squeeze board having green sand mold molding sensors embedded therein.
  • FIG. 21 represents a schematic of a structure of a casting mold molding device according to a third embodiment.
  • FIG. 1 represents a schematic of a structure of a casting mold molding device using green sand mold molding sensors according to the first embodiment
  • FIG. 2 represents a configuration of a portion of the casting mold molding device, wherein the portion evaluates casting mold quality.
  • the casting mold molding device according to the present embodiment is a flask molding machine in which, after a green sand mold (casting mold) is molded, a casting flask (metal flask), with the green sand mold contained therein, transfers to the next step.
  • a casting mold molding device 1 comprises a plate 2 having a pattern 3 attached to an upper surface thereof, a carrier 4 , a metal flask 5 , a filling flask 6 , a squeeze head 7 , a squeeze board 8 , a table 9 , green sand mold molding sensors 10 A, 10 B, 10 C, 10 D, wiring 11 , and a casting mold quality evaluation device 12 .
  • FIG. 2 represents the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D of the squeeze board 8 as seen when viewed from the line A-A of FIG. 1 (view taken along line A-A of FIG. 1 ).
  • the plate 2 has attached to an upper surface thereof an upper mold (or lower mold) pattern 3 for molding a shape of a casting in a green sand mold.
  • the plate 2 is formed from aluminum, for example.
  • the carrier 4 is flask shaped and the plate 2 is placed inside the flask.
  • green sand for molding a green sand mold is loaded into a casting mold molding space surrounded by the plate 2 , the metal flask 5 , the filling flask 6 , and the squeeze board 8 .
  • the squeeze board 8 is rectangular and is a member that constitutes a part of the boundary of the molding space defined by the squeeze board 8 and the metal flask 5 during green sand mold molding by the casting mold molding device 1 .
  • a gravity drop method that uses the weight of the green sand or a blowing method that uses an airflow is employed.
  • the gravity drop method is a method for loading green sand into the casting mold molding space by causing green sand accumulated in a louvered hopper (not shown) disposed at an upper portion of the casting mold molding device 1 to drop due to gravity.
  • the blowing method is a method for loading green sand by blowing green sand inside a sand tank (not shown) into the casting mold molding space.
  • the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D measure, during molding of a green sand mold, a pressure value (peak pressure) applied to a pressing surface between the squeeze board 8 and the green sand inside the casting mold molding space.
  • the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D are pressure sensors.
  • the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D are embedded in the four corners of the squeeze board 8 .
  • the reason, which is described later, that the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D are embedded in such a way is a result of considering the variation in pressure applied to the pressing surface of the squeeze board 8 .
  • the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D have a pressure-receiving surface for measuring pressure that is exposed in the pressing surface of the squeeze board 8 and measures the pressure value (peak pressure) applied to the pressing surface between the squeeze board and the green sand mold. At this time, it is desirable for the pressure-receiving surface of the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D and the pressing surface of the squeeze board 8 to be in a flush state with no differences in level therebetween. Due thereto, it is possible to measure the precise pressure.
  • the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D are fluid pressure sensors. An earth pressure sensor may also be used as the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D.
  • a small pressure-receiving surface makes it easier to match casting mold strength measurement positions in the green sand mold facing positions where pressure was measured, considering the size of the squeeze board 8 in which the sensors are embedded and the shape of the pattern 3 , and moreover, that, as described later, the casting mold strength of a formed green sand mold is measured by a casting mold strength gauge at positions of the plate 2 facing positions of the squeeze board 8 where the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D measured the pressure, and that a relationship between the pressure value (peak pressure) and the casting mold strength is utilized. Meanwhile, since measurement accuracy is also demanded, with respect to the size of the pressure-receiving surface, a diameter of approximately 5-30 mm is desirable.
  • FIG. 3 and FIG. 4 are lateral cross-section views representing details of a portion of the squeeze board 8 that has green sand mold molding sensors 10 A, 10 B, 10 C, 10 D embedded therein.
  • FIG. 3 represents a case wherein the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D are of a threaded type. As shown in FIG. 3 , a male thread is formed in a of the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D, a female thread is formed in b of the squeeze board 8 , and the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D are screwed to the squeeze board 8 .
  • FIG. 4 represents a case wherein the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D are of a disk shape.
  • the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D are placed in a hole in the squeeze board 8 and a ring-shaped liner 13 surrounds the outer edge of the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D.
  • bolts 14 fix the liner 13 and retain the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D.
  • green sand mold molding sensors 10 A, 10 B, 10 C, 10 D it is also possible to use an object having a specification of either a threaded type or a disk shape and that selection may be made with consideration given to an embedding space and attachability of the green sand mold molding sensors.
  • the wiring 11 connects the casting mold quality evaluation device 12 to the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D.
  • the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D and the casting mold quality evaluation device 12 are connected by wire (wired communication) via the wiring 11 but may also be connected wirelessly (wireless communication).
  • the casting mold quality evaluation device 12 evaluates the quality of a green sand mold molded by the casting mold molding device 1 from the pressure value (pressure value data) measured by the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D.
  • FIG. 5 is a block diagram representing a functional configuration of the casting mold quality evaluation device 12 for wired communication data.
  • the casting mold quality evaluation device 12 comprises a receiving unit 15 , an amplification unit 16 , an input unit 17 , a casting mold strength calculation unit 18 , a casting mold quality determination unit 19 , a display unit 20 , a transmission unit 21 , and a recording unit 22 .
  • the receiving unit 15 receives the pressure value (pressure value data) measured by the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D.
  • pressure value data measured by the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D.
  • wired data is received from the wiring 11 .
  • the amplification unit 16 amplifies the signal amount of the received pressure value (pressure value data).
  • the amplification unit 16 is, for example, an amplifier.
  • the input unit 17 is, for example, a keyboard or a touch panel.
  • the expression is a relational expression for determining the casting mold strength “y” from the slope “a” and the intercept “b” which were inputted and a measured value “x”.
  • the casting mold strength calculation unit 18 calculates the casting mold strength for each pressure value (peak pressure) measured by the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D by using the relational expression between the measured value and the casting mold strength. A method for calculating the casting mold strength is described in detail later.
  • the casting mold strength calculation unit 18 is, for example, a computer or a PLC.
  • the casting mold quality determination unit 19 determines the quality of a molded green sand mold from the threshold value of the casting mold strength inputted into the input unit 17 and the calculated casting mold strength. A method for determining the casting mold quality is described in detail later.
  • the casting mold quality determination unit 19 is, for example, a computer or a PLC.
  • the display unit 20 is, for example, a liquid crystal display, etc.
  • the transmission unit 21 transmits fault-determination data to a Patlite® 23 , etc. Transmission may be either by wired data or wireless data.
  • a worker that has recognized a defect occurrence in a green sand mold by confirming that the Patlite 23 is flashing, etc. is to make an X mark on the relevant green sand mold and thereby make it possible to understand at a glance that that green sand mold is a defective product.
  • a green sand mold that has been recognized as being a defective product does not undergo subsequent steps (molten metal pouring) and after skipping these steps is finally shaken out from the mold.
  • the recording unit 22 records pressure value data, casting mold strength data associated with pressure values, casting mold strength calculation results, and casting mold quality determination results, etc. Furthermore, these data are recorded for each pattern attached to the plate 2 .
  • the recording unit 22 is, for example, a recording medium such as a semiconductor memory or a magnetic disk, etc. In addition, the data recorded by the recording unit 22 may be extracted by using a USB memory or an SD card, etc.
  • FIG. 6 is a block diagram representing a functional configuration in the case wherein the pressure value (pressure value data) measured by the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D is connected wirelessly (wireless communication) to the casting mold quality evaluation device 12 .
  • the pressure value (pressure value data) measured by the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D is amplified by an amplification unit 16 ′ near the green sand mold molding sensors and wirelessly transmitted from a pressure value transmission unit 24 to a receiving unit 15 ′ of the casting mold quality evaluation device 12 .
  • the casting mold quality evaluation device 12 for wireless data shown in FIG. 6 comprises a receiving unit 15 ′, the input unit 17 , the casting mold strength calculation unit 18 , the casting mold quality determination unit 19 , the display unit 20 , the transmission unit 21 , and the recording unit 22 .
  • the receiving unit 15 ′ receives wireless data transmitted from the pressure value transmission unit 24 .
  • the functions of the input unit 17 , the casting mold strength calculation unit 18 , the casting mold quality determination unit 19 , the display unit 20 , the transmission unit 21 , and the recording unit 22 are the same as the functions of the casting mold quality evaluation device 12 for wired data described earlier.
  • FIG. 7 shows a schematic view representing a configuration of an experiment carried out herein, (a) being a cross-section view and (b) being a plan view of a squeeze board.
  • the cross-section view shown in FIG. 7( a ) has the pattern 3 arranged therein, but the experiment was carried out for cases in which the pattern 3 is attached and for cases in which the pattern 3 is not attached.
  • 7( b ) represents: a positional relationship between the squeeze board and the sensors; an integrated amplifier-recorder 25 that amplifies and records signals from the pressure sensors; and a computer 26 that is connected to the integrated amplifier-recorder 25 and performs analysis such as graphing sensor measurement values.
  • the experiment was performed as follows.
  • Green sand mold molding sensors were installed (embedded) in a squeeze board. As shown in FIG. 7 , installation locations were set at a total of three locations: in the central section (S 3 ) of the squeeze board and in two corner locations (S 1 , S 2 ) sandwiching the central section. Further, the present experiment was carried out for cases in which the pattern is attached and for cases in which the pattern is not attached.
  • a green sand mold was molded by a molding machine having green sand mold molding sensors installed in the squeeze board.
  • the pressure applied to the pressing surface of the squeeze board was measured by the green sand mold molding sensors at the three locations. Temporal changes in the pressure value were measured and recorded. With respect to squeezing, pressure was applied gradually up to a set pressure and was released when the set pressure was reached.
  • the casting mold strength of a green sand mold at a parting plane facing the positions where the green sand mold molding sensors measured the pressure was measured by a casting mold strength gauge and the relationship between the pressure value and the casting mold strength was investigated. Note that in the case in which the pattern was attached, the casting mold strength at the parting plane facing the position where the pressure was measured by the green sand mold molding sensor in the central section (S 3 ) is the casting mold strength at the upper surface of the pattern.
  • an invasive-type casting mold strength gauge that is widely used in casting mold factories to evaluate moldability of a green sand mold and that measures the casting mold strength by introducing, approximately 10 mm into the casting mold, a needle having a tip diameter of approximately 3 mm was used.
  • FIG. 8 is a graph representing one example showing temporal changes in the pressure of a green sand mold molding sensor in the squeezing step. Note that FIG. 8 represents the case in which there was no pattern, squeezing pressure was set at 0.6 MPa, and measurements were made by sensors at three locations. As shown in FIG. 8 , in this molding machine, the peak pressure was reached in the squeezing step approximately three seconds after squeezing commenced.
  • FIG. 9 is a graph summarizing, upon having repeated the abovementioned experiment, the relationship between the casting mold strength and the peak pressure of the green sand mold molding sensors which varies with the set squeezing pressure and the loading state of the green sand.
  • FIG. 9 plots, for each of the central section (S 3 ) and the periphery (S 1 , S 2 ) with the presence or absence of a pattern, the peak pressure of the pressing surface of the squeeze board and the measurement value of the casting mold strength of the green sand mold at the parting plane facing positions where the pressure was measured. Looking at the relationship between the peak pressure of the green sand mold molding sensors and the casting mold strength of the green sand mold at the parting plane facing positions where the pressure was measured shown in FIG.
  • the pressure reaching the pressing surface of the squeeze board varies depending on whether the position is the periphery or the central section and on the presence or absence of a pattern.
  • the casting mold strength at positions facing the squeeze board has a positive correlation with the pressure reaching the pressing surface of the squeeze board.
  • the relationship differs depending on the presence or absence of a pattern whereas the periphery is not influenced by the presence or absence of a pattern.
  • the loading density of green sand and the casting mold strength With respect to the relationship between the loading density of green sand and the casting mold strength, when the loading density is high, the casting mold strength becomes high.
  • the loading density and the casting mold strength have a strong positive correlative relationship with tamping force.
  • the peak pressure measured by the molding sensors is synonymous with tamping force. Therefore, when the peak pressure is high, a high loading density is achieved.
  • the loading density of a molded green sand mold is low, in other words, when the casting mold strength is low, there is a concern of defects such as molten metal infiltration, sand drop/sand inclusion, molten metal leakage, etc.
  • the pressure conveyed to the green sand mold molding sensors embedded in the squeeze board varies due to the causes mentioned above and therefore the embedding positions of the green sand mold molding sensors must be places where it is possible to ascertain these circumstances. Accordingly, if multiple green sand mold molding sensors are installed, it is possible to detect flaws under more conditions. However, due to space constraints and from an economic perspective, this is not realistic and it is desirable to be able to detect and evaluate pressure using a smaller number of sensors.
  • a gravity drop method or a blowing method that uses an airflow is employed for the loading of green sand by the casting mold molding device 1 .
  • a bias when the green sand is loaded into the louvered hopper may become a bias when loading into the casting mold molding space.
  • a bias may occur when loading into the casting mold molding space due to circumstances such as the distance from the blowing-in nozzle, sand blockage in the nozzle opening, etc.
  • These biases appear as biases in tamping pressure by the squeeze board 8 on the green sand at subsequent tamping of the green sand. It is necessary to arrange the green sand mold molding sensors by taking into consideration the occurrence of such biases in initial loading amounts.
  • the bias of the initial loading is large and it is possible to take measures such as: improving the state in which casting mold sand is loaded into the louvered hopper; adjusting blowing-in air pressure or blowing-in time; or improving the state (blockage, abrasion, etc.) of the blowing-in nozzle.
  • the flowability of the green sand has an influence when the casting mold sand is loaded into the louvered hopper, when loaded from the louvered hopper to the casting mold molding space, or when blown-in by means of blowing, etc.
  • This flowability of the green sand varies according to sand properties such as the water content of the green sand and it is therefore possible to adjust the sand by using a sand processing device such as a kneading machine that kneads green sand to be supplied to the casting mold molding device 1 .
  • green sand mold molding sensors near the casting flask side surface, which is not influenced by the presence or absence of a pattern, in particular, in the corner sections. If a measurement value of a green sand mold molding sensor disposed in this position does not reach a predetermined lower limit threshold value, it can be judged that a sufficient casting mold strength has not been reached and measures to increase the tamping force can be taken. If the measurement value is higher than an upper limit threshold value, it can be judged that the casting mold strength is more than sufficient and measures to decrease the tamping force can be undertaken.
  • the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D are embedded in the four corners of the squeeze board 8 .
  • the relationship between the peak value of the pressure of the green sand mold molding sensors and the casting mold strength is also the same when using another type of flask molding machine or a flaskless molding machine. As such, this relationship can also be applied in a casting mold molding device of a second embodiment which is described later.
  • the casting mold strength calculation unit 18 uses this relationship to calculate the casting mold strength from the casting mold strength inputted into the input unit 17 and the pressure value (peak pressure) measured by the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D.
  • calculation of the casting mold strength by the casting mold strength calculation unit 18 comprises two steps.
  • the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D are embedded in the four corners of the squeeze board 8 .
  • the pressure applied to the pressing surface of the squeeze board at these four locations and determining the relationship with the casting mold strength, it is possible to determine casting mold quality by using a small number of green sand mold molding sensors and taking into consideration variation in pressure at the pressing surface of the squeeze board.
  • the squeezing pressure it is possible to determine the relationship between the pressure applied to the pressing surface and the casting mold strength over a wider range.
  • FIG. 10 shows one example of a screen displayed on the display unit 20 .
  • a predetermined green sand mold is molded and seven pressure values (peak pressures) measured by the green sand mold molding sensors 10 A, 10 B at that time are displayed on the screen.
  • the casting mold strength at the parting plane facing positions in each of the molded green sand molds where the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D were arranged is inputted as an input value by a worker.
  • “Peak pressure A” and “Casting mold strength A” shown in FIG. 10 are, respectively, the peak pressure value of the green sand mold molding sensor 10 A and the casting mold strength at the position of the green sand mold molding sensor 10 A.
  • the casting mold strength is measured using a casting mold strength gauge and the number of peak pressures and casting mold strengths displayed on the screen is seven each for A and B.
  • this may be changed, as appropriate, according to the specifications of the casting mold molding device 1 , specifications such as shape and size of the green sand mold to be molded, etc., or the specifications of the green sand.
  • the casting mold quality determination unit 19 determines the quality of a green sand mold from the threshold value of the casting mold strength inputted into the input unit 17 and the casting mold strength calculated by the casting mold strength calculation unit 18 .
  • determination of the casting mold quality by the casting mold quality determination unit 19 comprises two steps.
  • FIG. 11 shows one example of a screen displayed on the display unit 20 .
  • specific threshold values inputted by a worker are displayed.
  • “Sensor A strength normal range” in FIG. 11 indicates the lower limit value and the upper limit value of the casting mold strength at the position of the green sand mold molding sensor 10 A
  • “Sensor B strength normal range” in FIG. 11 indicates the lower limit value and the upper limit value of the casting mold strength at the position of the green sand mold molding sensor 10 B
  • “Sensor D strength normal range” in FIG. 11 indicates the lower limit value and the upper limit value of the casting mold strength at the position of the green sand mold molding sensor 10 D.
  • “Casting mold strength difference (Max. ⁇ Min.) abnormality value” shown in FIG. 11 indicates a threshold value wherein the difference between the maximum and minimum values of the casting mold strength determined from the pressure value of the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D is set as an abnormality value.
  • the lower limit value of the casting mold strength at the position of the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D is set as 10.0 (N/cm 2 )
  • the upper limit value of the same is set as 20.0 (N/cm 2 )
  • the threshold value wherein the difference between the maximum value and the minimum value of the casting mold strength at the position of the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D is set as an abnormality value is set as 5.0 (N/cm 2 ).
  • the threshold values of the casting mold strength A, the casting mold strength B, the casting mold strength C, and the casting mold strength D are each set as 10.0 (N/cm 2 ) or more and 20.0 (N/cm 2 ) or less, and the abnormality threshold value of the difference between the maximum value and the minimum value of the casting mold strength at the positions of the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D is set as 5.0 (N/cm 2 ) or more.
  • the casting mold strength at the position of the green sand mold molding sensor 10 A is 13.0 (N/cm 2 )
  • the casting mold strength at the position of the green sand mold molding sensor 10 B is 12.0 (N/cm 2 )
  • the casting mold strength at the position of the green sand mold molding sensor 10 C is 16.0 (N/cm 2 )
  • the casting mold strength at the position of the green sand mold molding sensor 10 D is 14.0 (N/cm 2 )
  • the casting mold strength A, the casting mold strength B, the casting mold strength C, and the casting mold strength D are all within the threshold values.
  • the maximum value of the casting mold strengths A, B, C, D is 16.0 (N/cm 2 ), the minimum value is 12.0 (N/cm 2 ), and the difference between the maximum and the minimum is 4.0 (N/cm 2 ), which is within the range, and therefore the casting mold quality determination unit 19 determines that the casting mold quality is OK.
  • the casting mold strength at the position of the green sand mold molding sensor 10 A is 11.0 (N/cm 2 )
  • the casting mold strength at the position of the green sand mold molding sensor 10 B is 17.0 (N/cm 2 )
  • the casting mold strength at the position of the green sand mold molding sensor 10 C is 12.0 (N/cm 2 )
  • the casting mold strength at the position of the green sand mold molding sensor 10 D is 16.0 (N/cm 2 )
  • the casting mold strength A, the casting mold strength B, the casting mold strength C, and the casting mold strength D are all within the threshold values.
  • the maximum value of the casting mold strengths A, B, C, D is 17.0 (N/cm 2 )
  • the minimum value is 11.0 (N/cm 2 )
  • the difference between the maximum and the minimum is 6.0 (N/cm 2 ), which is not within the range, and therefore the casting mold quality determination unit 19 determines that the casting mold quality is faulty.
  • FIG. 12 shows one example of a screen displayed on the display unit 20 .
  • “Peak pressure A”, “Peak pressure B”, “Peak pressure C”, and “Peak pressure D” in FIG. 12 indicate, respectively, the peak pressure value of the green sand mold molding sensor 10 A, the peak pressure value of the green sand mold molding sensor 10 B, the peak pressure value of the green sand mold molding sensor 10 C, and the peak pressure value of the green sand mold molding sensor 10 D.
  • “Casting mold strength A”, “Casting mold strength B”, “Casting mold strength C”, and “Casting mold strength D” indicate, respectively, the casting mold strength at the position of the green sand mold molding sensor 10 A calculated by the casting mold strength calculation unit 18 , the casting mold strength at the position of the green sand mold molding sensor 10 B calculated by the casting mold strength calculation unit 18 , the casting mold strength at the position of the green sand mold molding sensor 10 C calculated by the casting mold strength calculation unit 18 , and the casting mold strength at the position of the green sand mold molding sensor 10 D calculated by the casting mold strength calculation unit 18 .
  • “Casting mold strength difference (Max. ⁇ Min.)” in FIG. 12 indicates the difference between the maximum value and the minimum value of the casting mold strengths A, B, C, D. Further, “Determination” in FIG. 12 indicates a determination result for the casting mold quality by the casting mold quality determination unit 19 .
  • the threshold values and the difference between the maximum value and the minimum value set for the casting mold strength A, the casting mold strength B, the casting mold strength C, and the casting mold strength D are determined, as appropriate, in accordance with the specifications of the casting mold molding device 1 , specifications such as shape, size, etc., of the green sand mold to be molded, the site of the green sand mold, or the specifications of the green sand, etc. In addition, these values are associated with a pattern number.
  • the casting mold strength calculation unit 18 calculates the casting mold strength and for the casting mold quality determination unit 19 to determine the quality of the molded green sand mold from the calculated casting mold strength.
  • a pressure value of a green sand mold molding sensor may be used as a reference for determining the casting mold quality directly without carrying out a casting mold strength calculation from the pressure value of the green sand mold molding sensor. For example, with respect to the values in the threshold value table of FIG.
  • each value is a predetermined threshold value set for the pressure value of a green sand mold molding sensor, and a measured pressure value of a green sand mold molding sensor may be determined to be OK (normal) or FT (faulty) by referring to this table.
  • FIG. 13 shows steps in a method for evaluating casting mold quality (method for molding a green sand mold) using the casting mold molding device 1 according to the first embodiment.
  • a louvered hopper 27 is coupled to the squeeze head 7 of the casting mold molding device 1 shown in FIG. 1 .
  • the louvered hopper 27 has a structure wherein a predetermined amount of green sand is loaded therein from a green sand transportation device (not shown) and, after having been briefly retained, louvers 28 at a lower portion of the louvered hopper 27 open and the green sand is loaded into the casting mold molding space.
  • louvers 28 at a lower portion of the louvered hopper 27 open and the green sand inside the louvered hopper 27 is loaded into the casting mold molding space defined by the plate 2 , the metal flask 5 and the filling flask 6 .
  • the coupled squeeze head 7 and louvered hopper 27 move, the squeeze board 8 is arranged directly above the casting mold molding space, and next, the table 9 rises and thereby the green sand inside the casting mold molding space is squeezed (compressed).
  • the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D measure the pressure value (peak pressure) at the pressing surface of the squeeze board. Note that the casting mold is molded in the present step. At this time, the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D are between the wall of the metal flask 5 of the squeeze board 8 and the pattern 3 .
  • the pressure value (peak pressure) at the pressing surface of the squeeze board is transmitted to the casting mold quality evaluation device 12 and the quality of the green sand mold that has just been molded is evaluated.
  • a green sand mold determined to be OK by the casting mold quality evaluation device 12 flows, as-is, along the line and subsequent steps (molten metal pouring, etc.) are carried out.
  • a green sand mold determined to be faulty by the casting mold quality evaluation device 12 flows, as-is, along the line, but subsequent steps (molten metal pouring, etc.) are not carried out.
  • the green sand mold skips these steps and, as a casting mold to be discarded, is shaken out from the mold in the same way as a green sand mold having a casting mold quality evaluation determined as being OK.
  • a determination of “good” or “poor” with respect to the quality of a molded casting mold for each flask which can therefore lead to a casting mold quality assurance for each flask.
  • the table 9 lowers, the filling flask 6 separates from the metal flask 5 upper surface, and when the table lowers further, the metal flask 5 containing the green sand mold is placed on a roller conveyor connected to subsequent steps such as core-setting, molten metal pouring, etc., the pattern 3 is removed from the green sand mold, and the lowering of the table 9 stops.
  • the metal flask 5 containing the green sand mold is conveyed on the roller conveyor to a subsequent step and the metal flask 5 is loaded into the casting mold molding device 1 in preparation for the next molding. Note that when the lowering of the table 9 commences, a predetermined amount of green sand is supplied to the louvered hopper 27 with the louvers 28 closed.
  • pressure value data, casting mold strength data associated with pressure values, casting mold strength calculation results, and casting mold quality determination results, etc., which are produced during the molding step are all recorded in the recording unit 22 of the casting mold quality evaluation device 12 . Therefore, it is possible to use these numerical values to monitor the operational state of the casting mold molding device 1 and these numerical values are useful in quality control, maintenance, and troubleshooting of the casting mold molding device 1 . Furthermore, using these numerical values can lead to early detection of defect causes such as: sand spillage, burn-in of a casting, and mold drop which occur due to loading defects; and swelling of a green sand mold due to molten metal pressure after pouring.
  • the data recorded in the recording unit 22 are recorded for each pattern attached to the plate 2 . Therefore, it is possible to compare and examine a state, such as a defect in a green sand mold, with pressure value data, and setting of a more accurate threshold value becomes possible.
  • a worker clarifies that the green sand mold in question is a defect.
  • a determination result is automatically communicated to casting mold equipment of a subsequent step (molten metal pouring, etc.).
  • the casting mold equipment automatically recognizes that the green sand mold in question is a defect, omits (skips) the step, and finally the green sand mold in question is shaken out from the mold.
  • the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D are embedded in the four corners of the squeeze board 8 .
  • the number of green sand mold molding sensors embedded in the squeeze board 8 is small, it is possible to calculate the relationship between the casting mold strength and the peak value of the pressure of the green sand mold molding sensors. In that case, accuracy is slightly lower in comparison with the case in which green sand mold molding sensors are embedded in four locations, but it is possible to curb costs.
  • FIGS. 14 and 15 show other examples of the squeeze board 8 having green sand mold molding sensors 10 A, 10 B embedded therein.
  • 3 a shown by two-dot chain lines in these drawings shows a position in the casting mold molding space corresponding to the pattern 3 on the plate 2 having the pattern attached thereto.
  • the two green sand mold molding sensors 10 A, 10 B are embedded near the central section of the long sides of the squeeze board 8 .
  • the two green sand mold molding sensors 10 A, 10 B are embedded near the central section of the short sides of the squeeze board 8 .
  • positions where the green sand mold molding sensors are embedded are positions corresponding to positions between the metal flask 5 and the pattern 3 in the casting mold molding space, in other words, between the metal flask 5 and the pattern 3 on the plate 2 having the pattern 3 attached thereto, and on the squeeze board or squeeze feet side facing a portion where there is no pattern on the plate 2 .
  • the green sand mold sensor of the first embodiment makes it possible to measure a pressure value (peak pressure) applied to the pressing surface between the squeeze board 8 and green sand inside the casting mold molding space during molding of a green sand mold in order to determine the quality of a molded green sand mold.
  • FIG. 16 represents a schematic of a structure of the casting mold molding device using green sand mold molding sensors according to the second embodiment
  • FIG. 17 represents a configuration of a portion of the casting mold molding device, wherein the portion evaluates casting mold quality.
  • the casting mold molding device according to the present embodiment is a flaskless molding machine in which, after a green sand mold is molded, the green sand mold is removed from a casting flask.
  • a casting mold molding device 29 comprises the plate 2 having the pattern 3 attached to the upper and lower surfaces thereof, a shuttle dolly 30 , a cope (metal flask) 31 , a drag (metal flask) 32 , an upper squeeze board 33 , a lower squeeze board 34 , the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D embedded in the pressing surface of the upper squeeze board 33 , green sand mold molding sensors 10 E, 10 F, 10 G, 10 H embedded in the pressing surface of the lower squeeze board 34 , the wiring 11 , and the casting mold quality evaluation device 12 . Note that FIG.
  • the plate 2 has attached to the upper and lower sides thereof the pattern 3 for molding a shape of a casting in a green sand mold.
  • the shuttle dolly 30 has the plate 2 placed thereon and makes round trips between the inside and the outside of the casting mold molding device 29 in accordance with the step.
  • the cope 31 has green sand loaded therein in order to mold an upper mold of the green sand mold. In other words, the casting mold molding space surrounded by the cope 31 , the upper squeeze board 33 , and the plate 2 is loaded with green sand.
  • the drag 32 has green sand loaded therein in order to mold a lower mold of the green sand mold.
  • the casting mold molding space surrounded by the drag 32 , the lower squeeze board 34 , and the plate 2 is loaded with green sand.
  • the upper squeeze board 33 and the lower squeeze board 34 are rectangular and are members that constitute a part of a boundary of a molding space defined by the members and, respectively, the cope 31 and the drag 32 during green sand mold molding by the casting mold molding device 29 .
  • the blowing method is a method for loading green sand by blowing in green sand to the upper and lower surfaces of the plate 2 from green sand blowing-in ports 35 , 35 of the cope 31 and drag 32 .
  • the upper squeeze board 33 and the lower squeeze board 34 act via a cylinder (not shown), and the upper and lower green sand molds are molded simultaneously by tamping and compressing the green sand loaded in the cope 31 and the green sand loaded in the drag 32 .
  • the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D measure the pressure value (peak pressure) applied to the pressing surface between the upper squeeze board 33 and green sand loaded inside the cope 31 during molding of a green sand mold.
  • the green sand mold molding sensors 10 E, 10 F, 10 G, 10 H measure the pressure value (peak pressure) applied to the pressing surface between the lower squeeze board 34 and green sand loaded inside the drag 32 during molding of a green sand mold.
  • the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D and 10 E, 10 F, 10 G, 10 H are pressure sensors.
  • the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D are embedded in the four corners of the pressing surface of the upper squeeze board 33 .
  • the green sand mold molding sensors 10 E, 10 F, 10 G, 10 H are embedded in the four corners of the pressing surface of the lower squeeze board 34 .
  • the reason that the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D, and 10 E, 10 F, 10 G, 10 H are embedded in such a way is the same as the reason described in the first embodiment.
  • the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D, and 10 E, 10 F, 10 G, 10 H have a pressure-receiving surface for measuring pressure that is exposed in pressing surface of the upper squeeze board 33 and the lower squeeze board 34 and measures the pressure value (peak pressure) applied to the pressing surface of the upper squeeze board 33 and the lower squeeze board 34 .
  • the pressure-receiving surface of the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D and 10 E, 10 F, 10 G, 10 H and the pressing surface of the upper squeeze board 33 and the lower squeeze board 34 to be in a flush state with no differences in level therebetween. Due thereto, it is possible to measure the precise pressure.
  • the wiring 11 connects the casting mold quality evaluation device 12 to the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D, and 10 E, 10 F, 10 G, 10 H.
  • the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D, and 10 E, 10 F, 10 G, 10 H, and the casting mold quality evaluation device 12 are connected by wire via the wiring 11 but may also be connected wirelessly.
  • wireless communication such as a wireless LAN or Bluetooth, etc., to transmit the pressure value (pressure value data) detected by the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D, and 10 E, 10 F, 10 G, 10 H to the casting mold quality evaluation device 12 .
  • the casting mold quality evaluation device 12 evaluates the quality of the green sand mold molded by the casting mold molding device 29 from the pressure value (pressure value data) measured by the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D, and 10 E, 10 F, 10 G, 10 H.
  • the casting mold quality evaluation device 12 comprises a receiving unit 15 , an amplification unit 16 , an input unit 17 , a casting mold strength calculation unit 18 , a casting mold quality determination unit 19 , a display unit 20 , a transmission unit 21 , and a recording unit 22 .
  • the receiving unit 15 receives the pressure value (pressure value data) measured by the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D and 10 E, 10 F, 10 G, 10 H.
  • the amplification unit 16 amplifies the signal amount of the received pressure value (pressure value data).
  • the casting mold strength calculation unit 18 uses the relational expression between the casting mold strength and the measurement values to calculate the casting mold strength for each pressure value (peak pressure) measured by the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D and 10 E, 10 F, 10 G, 10 H.
  • the casting mold quality determination unit 19 determines the quality of a molded green sand mold from the threshold value of the casting mold strength inputted into the input unit 17 and the calculated casting mold strength.
  • the transmission unit 21 transmits fault-determination data to the Patlite 23 , etc.
  • the recording unit 22 records pressure value data, casting mold strength data associated with pressure values, casting mold strength calculation results, and casting mold quality determination results, etc.
  • FIG. 18 shows steps in a method for evaluating casting mold quality (method for molding a green sand mold) using the casting mold molding device 29 according to the second embodiment. Note that in FIG. 18 , a sand tank 36 is adjacent to the casting mold molding device 29 shown in FIG. 16 .
  • a predetermined amount of green sand is loaded into the sand tank 36 from the green sand transportation device (not shown) and, after having been briefly retained, a loading hole is closed and when compressed air is supplied inside the sand tank 36 , green sand is loaded by being blown into the upper and lower casting mold molding spaces via green sand blowing-in ports 35 , 35 in the cope 31 and the drag 32 .
  • the lower squeeze board 34 which has the green sand mold molding sensors 10 E, 10 F, 10 G, 10 H embedded therein, and the drag 32 rise, lift the plate 2 from the shuttle dolly 30 , and when the state shown in FIG. 18( b ) is set, compressed air is supplied to the sand tank 36 and green sand is loaded by being blown into the upper and lower casting mold molding spaces via the green sand blowing-in ports 35 , 35 in the cope 31 and the drag 32 .
  • the upper and lower squeeze boards 33 , 34 which have the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D and 10 E, 10 F, 10 G, 10 H embedded therein, squeeze (compress) the green sand inside the cope 31 and the drag 32 and the state shown in FIG. 18( c ) is achieved.
  • the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D and 10 E, 10 F, 10 G, 10 H measure the pressure value (peak pressure) at the pressing surface of the upper and lower squeeze boards 33 , 34 . Note that green sand molds are molded in the present step.
  • the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D and 10 E, 10 F, 10 G, 10 H are between the pattern 3 and the wall of, respectively, the cope 31 of the upper squeeze board 33 and the drag 32 of the lower squeeze board 34 .
  • the measured pressure value peak pressure
  • a green sand mold determined to be OK by the casting mold quality evaluation device 12 flows, as-is, along the line and subsequent steps (molten metal pouring, etc.) are carried out.
  • a green sand mold determined to be faulty by the casting mold quality evaluation device 12 flows, as-is, along the line, but subsequent steps (molten metal pouring, etc.) are not carried out.
  • the green sand mold skips these steps and, as a casting mold to be discarded, is shaken out from the mold in the same way as a green sand mold for which the casting mold quality is determined to be OK.
  • the aligned upper and lower green sand molds are transported from the casting mold molding device 29 to a line of the next step.
  • pressure value data, casting mold strength data associated with pressure values, casting mold strength calculation results, and casting mold quality determination results, etc., which are produced during the molding step are all recorded in the recording unit 22 of the casting mold quality evaluation device 12 . Therefore, it is possible to use these numerical values to monitor the operational state of the casting mold molding device 29 and these numerical values are useful in quality control, maintenance, and troubleshooting of the casting mold molding device 29 . Furthermore, using these numerical values can lead to early detection of defect causes such as: sand spillage, burn-in of a casting, and mold drop which occur due to loading defects; and swelling of a green sand mold due to molten metal pressure after pouring.
  • the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D and 10 E, 10 F, 10 G, 10 H are embedded in the four corners of the pressing surface of the upper and lower squeeze boards 33 , 34 near the cope 31 and the drag 32 .
  • the number of green sand mold molding sensors embedded in the upper and lower squeeze boards 33 , 34 is small, it is possible to calculate the relationship between the casting mold strength and the peak value of the pressure of the green sand mold molding sensors. In that case, accuracy is slightly lower in comparison with the case in which green sand mold molding sensors are embedded in four locations, but it is possible to curb costs.
  • FIGS. 19 and 20 show other examples wherein the pressing surface of the upper squeeze board 33 has green sand mold molding sensors 10 A, 10 B embedded therein.
  • 3 a shown by two-dot chain lines in these drawings shows a position in the casting mold molding space corresponding to the pattern 3 on the plate 2 having the pattern attached thereto.
  • the two green sand mold molding sensors 10 A, 10 B are embedded near the central section of the long sides of the upper squeeze board 33 .
  • the two green sand mold molding sensors 10 A, 10 B are embedded near the central section of the short sides of the upper squeeze board 33 . It is possible to arrange the molding sensors 10 E, 10 F in the same state in the pressing surface of the lower squeeze board 34 . Due to the arrangement of these molding sensors, it is possible to ascertain a bias in the loading amount, etc., between right and left of the green sand blowing-in ports 35 , 35 , or in the proximity or distance of the green sand blowing-in ports 35 , 35 .
  • the green sand mold molding sensor makes it possible to measure the pressure value (peak pressure) applied to the pressing surface between the upper squeeze board 33 and green sand loaded inside the cope 31 and the pressure value (peak pressure) applied to the pressing surface between the lower squeeze board 34 and sand loaded inside the drag 32 during molding of a green sand mold in order to determine the quality of a molded casting.
  • the casting mold quality evaluation device 12 after determining the relationship between the casting mold strength and the pressure value (peak pressure) from the measured casting mold strength and the pressure value (peak pressure) measured by the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D (and 10 E, 10 F, 10 G, 10 H), the casting mold quality evaluation device 12 separately calculates the casting mold strength from the pressure value (peak pressure) measured by the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D (and 10 E, 10 F, 10 G, 10 H). In addition, the quality of a molded green sand mold is determined from the pre-set threshold value of the casting mold strength and the calculated casting mold strength.
  • the casting mold quality evaluation device 12 determines that the reason therefor is because sand was not loaded evenly inside the casting mold and that the cause thereof is that the CB value of the green sand is high, and by providing an instruction to the kneading machine to reduce the amount of water injected, it is possible to resolve the loading defect of the green sand.
  • the casting mold quality evaluation device 12 converts measured casting mold strengths and the pressure values (peak pressure) measured by the green sand mold molding sensors 10 A, 10 B, 10 C, 10 D (and 10 E, 10 F, 10 G, 10 H) into the casting mold strength and determines the quality of molded green sand molds from that casting mold strength.
  • the pressure value (peak pressure) since it has been ascertained that there is a correlative relationship between the pressure value (peak pressure) and the casting mold strength, it is also possible to determine the quality of a green sand mold directly from the pressure value (peak pressure) without converting to the casting mold strength.
  • FIG. 21( a ) is a vertical cross-section view of a casting mold molding device using green sand mold molding sensors that is a third embodiment of the present invention.
  • FIG. 21( b ) shows squeeze feet when viewed from line D-D. Note that in the third embodiment described below, for configurations common with the first embodiment, the same reference signs are used in the drawings and descriptions thereof are omitted. In the third embodiment, squeeze feet, rather than a squeeze board, are used.
  • the reference sign 300 refers to squeeze feet.
  • the squeeze feet 300 are arranged rectangularly and are members that constitute a part of a boundary of a molding space defined by the squeeze feet 300 and the metal flask 5 during green sand mold molding by the casting mold molding device 1 . As shown in FIG. 21( b ) , green sand mold molding sensors 101 , 10 J, 10 K, 10 L are embedded in individual squeeze feet.
  • the embodiment shown in these drawings differs from the first embodiment described above in that the squeeze feet 300 are used as elements that perform the squeezing action.
  • these squeeze feet 300 by vertically positioning the squeeze feet 300 facing the pattern 3 according to the height of the pattern 3 and moving the squeeze feet 300 during the squeezing action, the height of the loaded green sand is adjusted and the tamping pressure is controlled to be the same at all squeeze feet upon completion of the squeezing.
  • squeeze feet 300 b, 300 d which face high sections of the pattern 3 , are positioned so as to protrude further toward the pattern 3 than do squeeze feet 300 a, 300 c, 300 e, which face low sections of the pattern 3 .
  • squeeze feet 300 b, 300 d When a casting mold molding space is subsequently defined and green sand is loaded with the positions of these squeeze feet 300 a - 300 e kept as-is (not shown), the amount of sand directly below the squeeze feet 300 b, 300 d can be made smaller than the amount of sand directly below the squeeze feet 300 a, 300 c, 300 e (not shown).
  • preliminary observations are made of the tendency of a loading state of green sand, not only of the height of the pattern, and the vertical positions of the squeeze feet 300 may be adjusted in line with a non-uniformity in the loading of the green sand.
  • the squeeze feet By controlling the squeeze feet in such a way, even when there is a pattern or even when there is a non-uniform tendency in sand loading before squeezing, it is possible to move the squeeze feet by means of cylinders that cause vertical movement, during green sand loading and during squeezing, such that the squeeze feet perform tamping with equal force.
  • the (peak) pressure values measured by the green sand mold molding sensors embedded in the squeeze feet 300 are equal at all the sensors.
  • a measured pressure value during molding lies outside the variation in values observed in a normal state, it is believed that an abnormality has occurred due to some kind of cause.
  • These causes are believed to include extremely non-uniform sand introduction and malfunctioning of the cylinders that move the squeeze feet. Cases where the variation in these pressure values has become large are regarded as cases where a peculiar variation has occurred, and the casting molds are determined and processed as FT in the casting mold quality evaluation device.
  • a method for determining a peculiar variation herein may be, for example, a case where a standard deviation in the pressure values measured by a plurality of green sand mold molding sensors embedded in the squeeze feet during molding of one casting mold is calculated, and the standard deviation is greater than a predetermined reference value.
  • This reference value may be arbitrarily set and, for example, may be initially set as a value considered appropriate in terms of casting mold quality.
  • a peculiar variation is a case in which a variation is greater, by 20% or more, than the average value of the standard deviations of pressure values measured for casting molds molded in the preceding 10 flasks.
  • the number of previously molded casting molds to be subjected to average calculations and the ratio of the extent by which the average is exceeded, which is a determination reference for peculiar variations, can be selected as appropriate herein.
  • casting mold molding is performed through the same movements as those of the first embodiment, and the same functions and effects as those of the first embodiment mentioned above are obtained.
  • first, second, and third embodiments are examples where two or more pressure sensors were provided in the squeeze board or squeeze feet.
  • a configuration in which one pressure sensor is provided to the squeeze board or squeeze feet is also possible. In that case, it is desirable that the position at which the pressure sensor is attached is near the pattern of the plate. Further, in such cases when there is one pressure sensor, the output of the one pressure sensor also indicates a value related to the casting mold strength at a specific position of the casting mold. Therefore, accuracy decreases but it is possible to use this value to perform an evaluation of the casting mold quality.

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CN107297470A (zh) * 2017-08-22 2017-10-27 湖州市下昂多联铸造有限公司 一种型砂压实设备用的压紧机构
WO2019239733A1 (ja) * 2018-06-15 2019-12-19 新東工業株式会社 鋳型造型装置及び鋳型造型装置の制御方法

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US20220055098A1 (en) 2022-02-24
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