KR20200007002A - Flaskless Molding Machine - Google Patents

Abstract

The flashless molding machine includes an upper mold, a lower mold, an upper sand tank, an upper plate mounted at the lower end of the upper sand tank, a first lower sand tank, and a mold yarn supplied from the first lower sand tank. A lower plate having a second lower sand tank for storing, an upper plate mounted to an upper end of the second lower sand tank, and having at least one supply port communicating from the second lower sand tank to the lower mold; At least one pressure detector which detects the pressure of at least one tank of a sand tank and a 2nd lower sand tank, and a control part connected to a pressure detector and acquiring the detection result of at least one pressure detector are provided.

Description

Flaskless Molding Machine

TECHNICAL FIELD The present disclosure relates to a flaskless molding machine.

Patent document 1 discloses a flashless molding machine which molds a mold of a moldless form without a mold. This molding machine includes a set of upper and lower molds for sandwiching a match plate on which a model is installed. A supply mechanism for supplying mold sand and a squeeze mechanism for compressing mold sand is provided. The molding machine accesses the lower mold to the upper mold and puts a match plate between the upper mold and the lower mold. In this state, the molding machine supplies the molding yarn to the upper and lower molding spaces formed by the upper mold and the lower mold by operating the supply mechanism. The molding machine compresses the molding sand in the upper and lower molding space by operating the squeeze mechanism. Through the above process, the upper mold and the lower mold are simultaneously molded.

The supply mechanism of this molding machine supplies the molding sand to the upper and lower molding spaces using compressed air. The supply mechanism has an upper sand tank in communication with a source of compressed air and storing mold sand, and an upper blow head disposed on top of the upper mold and statically connected to the upper sand tank. The compressed air blown from the compressed air source supplies the mold sand stored in the upper sand tank to the upper blow head, and the mold sand of the upper blow head to the upper molding space partitioned by the upper mold. Similarly, the supply mechanism has a lower sand tank in communication with a compressed air source and storing mold sand, and a lower blow head disposed below the lower mold, moving up and down, and connected to the lower sand tank at a predetermined position. . The compressed air blown from the compressed air source supplies the mold sand stored in the lower sand tank to the lower blow head, and the mold sand of the lower blow head to the lower mold.

The squeeze mechanism of this flashless molding machine includes an upper squeeze cylinder and a lower squeeze cylinder facing up and down. The upper squeeze cylinder applies downward pressure on the mold sand of the upper molding space, and the lower squeeze cylinder applies pressure on the mold sand of the lower molding space. As a result, the hardness of the molding die increases.

Patent Document 1: Japanese Patent Application Laid-Open No. 54-51930

In the apparatus for supplying the molding sand to the molding space using compressed air, like the flashless molding machine described in Patent Document 1, there is a fear that sand clogging occurs in the sand tank. However, the flashless molding machine described in Patent Document 1 cannot grasp the situation in the sand tank. Such clogging affects the molding of the mold and the quality of the cast product. In the art, there is a need for a flashless molding machine for molding an excellent mold or casting product.

The flashless molding machine according to one aspect of the present disclosure is a flashless molding machine for molding an upper mold and a lower mold of a flask, and is disposed below the upper mold and the upper mold, A lower mold frame capable of pinching the match plate together with the mold, an upper sand tank disposed above the upper mold frame, connected to a compressed air source, the lower end of which is opened, and storing the mold sand therein; A top plate mounted at the lower end of the tank, the upper plate having at least one supply port communicating from the upper sand tank to the upper mold frame, connected to a compressed air source, storing the mold yarn therein, and discharging the stored mold yarn A second lower sand tank having a first connection port to be formed, and a second contact disposed below the lower mold, the upper end of which is open, and connectable to the first connection port of the first lower sand tank; A second lower sand tank having a sphere and storing mold sand supplied from the first lower sand tank and supplied into the lower mold, and mounted to an upper end of the second lower sand tank, and from the second lower sand tank to the lower mold A lower plate having at least one supply port communicating therewith, at least one pressure detector for detecting pressure of at least one of the upper sand tank, the first lower sand tank, and the second lower sand tank, and a pressure detector; And a control unit for acquiring detection results of at least one pressure detector.

In this flashless molding machine, the pressure of at least one of the upper sand tank, the first lower sand tank, and the second lower sand tank is detected by the at least one pressure detector. And the detection result of at least 1 pressure detector is acquired by a control part. Thus, since the situation in a sand tank is grasped | ascertained by acquiring the pressure in a tank, according to this apparatus, the outstanding mold and casting product can be obtained as a result.

In one embodiment, the flashless molding machine includes a drive unit for moving the second lower sand tank in the vertical direction to squeeze the upper plate and the lower plate, and an adjustment drive unit for moving the first lower sand tank in the vertical direction. You may also When comprised in this way, in the apparatus by which a squeeze process is performed by moving a 2nd lower sand tank to an up-down direction, the situation in a sand tank is grasped | ascertained.

In one embodiment, the upper sand tank may have a storage chamber for storing mold sand and at least one supply chamber provided on the side of the storage chamber and connected to the compressed air source. The at least one pressure detector may detect the pressure of at least one supply chamber of the upper sand tank. When comprised in this way, this apparatus can use the supply chamber for supplying compressed air for arrangement | positioning of a pressure detector.

In one embodiment, at least one supply chamber of an upper sand tank may include the 1st supply chamber located in the upper end side rather than the center of an upper sand tank, and the 2nd supply chamber located in the lower end side than the center of an upper sand tank. . The at least one pressure detector may include a first pressure detector for detecting the pressure in the first supply chamber and a second pressure detector for detecting the pressure in the second supply chamber. When comprised in this way, the pressure of the upper sand tank upper and lower, ie, the pressure of the whole upper sand tank, is detected. For this reason, this apparatus can grasp | ascertain the pressure deviation which depended on the detection position of the upper sand tank.

In one embodiment, the storage chamber of the upper sand tank may have the 1st permeable member which has the some hole in which the compressed air can flow in the inner surface. At least one supply chamber of the upper sand tank may communicate with the storage chamber of the upper sand tank through the first permeable member. When comprised in this way, this apparatus can detect the blockage of a 1st permeable member.

In one embodiment, the 1st lower sand tank may have a storage chamber which stores mold sand, and at least 1 supply chamber provided in the side of a storage chamber, and connected to the compressed air source. And at least one pressure detector may detect the pressure of at least 1 supply chamber of a 1st lower sand tank. When comprised in this way, this apparatus can use the supply chamber for supplying compressed air for arrangement | positioning of a pressure detector.

In one embodiment, the at least one supply chamber of a 1st lower sand tank is a 3rd supply chamber located in the center of a 1st lower sand tank, and a 4th supply chamber located in the upper end side rather than the center of a 1st lower sand tank. And a fifth supply chamber located at a lower end side than the center of the first lower sand tank. The at least one pressure detector includes a third pressure detector for detecting the pressure in the third supply chamber, a fourth pressure detector for detecting the pressure in the fourth supply chamber, and a fifth pressure detector for detecting the pressure in the fifth supply chamber. You may also When comprised in this way, the upper and lower pressure of a 1st lower sand tank, ie, the pressure of the whole 1st lower sand tank, is detected. For this reason, this apparatus can grasp | ascertain the pressure deviation which depended on the detection position of a 1st lower sand tank.

In one embodiment, the storage chamber of the 1st lower sand tank may have the 2nd permeable member which has the some hole which the compressed air can distribute | circulate in the inner surface. The third supply chamber and the fourth supply chamber may communicate with the storage chamber of the first lower sand tank through the second permeable member. When comprised in this way, this apparatus can detect the blockage of a 2nd permeable member.

In one embodiment, the 5th supply chamber may be provided in the curved lower end part of a 1st lower sand tank, and may communicate with the storage chamber of a 1st lower sand tank through a some vent hole. When comprised in this way, this apparatus can detect a pressure in the lower end part of the 1st lower sand tank in which the permeation | transmission member tends to be clogged easily. Moreover, in the curved lower end part of a 1st lower sand tank, it exists in the tendency for abrasion of the permeation | transmission member arrange | positioned in a storage chamber to become large compared with another arrangement position by the shape. This apparatus uses a plurality of vent holes in place of the permeable member in the storage chamber of the curved lower end portion of the first lower sand tank. For this reason, this apparatus can avoid the generation | occurrence | production of the blockage of the permeable member in the curved lower end part of a 1st lower sand tank.

In one embodiment, the 2nd lower sand tank may have the storage chamber which stores mold sand, and the at least 1 supply chamber provided in the bottom part of a storage chamber, and connected to the compressed air source. And at least one pressure detector may detect the pressure of at least 1 supply chamber of a 2nd lower sand tank. When comprised in this way, this apparatus can use the supply chamber for supplying compressed air for arrangement | positioning of a pressure detector.

In one embodiment, at least one supply chamber of a 2nd lower sand tank may communicate with the storage chamber of a 2nd lower sand tank through a some vent hole. In the second lower sand tank, the mold sand flows from the bottom to the top and is supplied into the bottom mold. For this reason, the wear of the permeable member disposed in the storage chamber of the second lower sand tank tends to be larger than that of other tanks. This apparatus uses a plurality of vent holes in place of the permeable member in the storage chamber of the second lower sand tank. For this reason, this apparatus can avoid generation | occurrence | production of the blockage of a permeation | transmission member in a 2nd lower sand tank.

In one embodiment, the flashless molding machine may be connected to the control unit and may include a display unit that displays the detection result of at least one pressure detector. When comprised in this way, this apparatus can inform an operator of the detection result of a pressure detector.

In one embodiment, the control unit may display, on the display unit, a graph showing the relationship between pressure and time as a detection result. In this configuration, the device can inform the operator of the time dependence of the pressure.

In one embodiment, the control unit may display a setting screen for setting the aeration setting pressure and time on the display unit. In such a configuration, the apparatus can support the setting operation by the operator.

In one embodiment, the flashless molding machine may be provided with a storage unit that stores the detection result of at least one pressure detector. The control unit may display the detection result stored in the storage unit and the detected current detection result in the display unit in a comparable mode. In such a configuration, the apparatus can inform the operator of the difference between the previous detection result and the current detection result.

In one embodiment, the control unit may have a communication unit that transmits the detection result of at least one pressure detector through a communication network. In such a configuration, the apparatus can transmit the detection result of the pressure detector to an external computer or the like without passing through the physical storage medium.

In one embodiment, the flashless molding machine may be connected to the control unit and may include a display unit that displays the detection result of at least one pressure detector. The control unit may display the detection result of the at least one pressure detector of the upper sand tank and the preset threshold in the display unit in a comparable manner. In this case, the apparatus can predict the blockage of the first transmission member with respect to the operator.

In one embodiment, the flashless molding machine may be connected to the control unit and may include a display unit that displays the detection result of at least one pressure detector. The control unit may display the pressure detected by the third pressure detector or the fourth pressure detector and the preset threshold in the display unit in a comparable manner. In this case, the apparatus can predict the clogging of the second transmission member with respect to the operator.

In one embodiment, at least one control valve which can be opened and closed in accordance with a control signal may be provided between each of the upper sand tank, the first lower sand tank, and the second lower sand tank and the compressed air source. The control unit may output a control signal to at least one control valve based on the detection result of the at least one pressure detector. In such a configuration, the apparatus can perform, for example, feedback control with respect to pressure, so that the flow of mold sand in the tank can be appropriately controlled.

In one embodiment, when the control part exhausts the upper sand tank, the first lower sand tank and the second lower sand tank, at least one control valve is opened based on a detection result of the at least one pressure detector. You may output a control signal so that it may become so. In this configuration, the apparatus can prevent the mold injection back from the storage chamber to the supply chamber.

In one embodiment, when the control part exhausts the upper sand tank, the first lower sand tank, and the second lower sand tank, an alarm is provided when the pressure detected by the at least one pressure detector does not fall below a predetermined threshold. You may output the information. With this arrangement, the device can warn the operator that the exhaust system is defective.

In one embodiment, the control valve corresponding to an upper sand tank may be arrange | positioned at the side of an upper sand tank, and the control valve corresponding to a 1st lower sand tank may be arrange | positioned at the side of a 1st lower sand tank. In such a configuration, the distance from the tank to the corresponding control valve becomes short, so that the device can improve the responsiveness of supply of compressed air.

In one embodiment, the control unit may extend the aeration time when the maximum pressure detected by the pressure detector within the predetermined aeration time does not reach a predetermined threshold during the aeration process. And after a control part extends, when the maximum pressure detected by the at least 1 pressure detector did not reach predetermined | prescribed threshold value, you may output alarm information. With this configuration, the device can automatically perform additional aeration when the maximum pressure does not reach a predetermined threshold. In addition, the device can alert the operator when the situation is not improved by additional aeration.

According to various aspects and embodiments of the present disclosure, a flashless molding machine for molding an excellent mold or foundry product is provided.

1 is a perspective view of a front side of a flashless molding machine according to an embodiment.
2 is a front view of a flashless molding machine according to an embodiment.
3 is a schematic view of the left side of the flashless molding machine according to the embodiment;
4 is a schematic view of the left surface side of the flashless molding machine in the aeration process.
5 is a schematic view of the left side of the supply structure of compressed air for the upper sand tank.
6 is a schematic view of the back side of a supply structure of compressed air for an upper sand tank.
7 is a schematic view of an upper surface side of a supply structure of compressed air for an upper sand tank.
8 is a schematic view of the left side of the supply structure of compressed air for the first lower sand tank and the second lower sand tank.
9 is a schematic view of the back side of a supply structure of compressed air for the first lower sand tank and the second lower sand tank.
10 is a partially enlarged view of the bottom of the device of FIG. 8;
11 is a cross-sectional view of the check door.
12 is an example of connection of a third pressure detector.
It is a flowchart explaining the shaping | molding process of the flashless molding machine which concerns on one Embodiment.
14 is a functional block diagram of a flashless molding machine according to an embodiment.
It is an example of the graph which shows the control signal of a vacuum proportional valve, and the detection result of a pressure detector.
It is an example of the graph which shows the detection result of a pressure detector, and a threshold value.
17 is an example in which the detection result stored beforehand is compared with this detection result.
18 shows an example of the screen displayed by the display unit.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment is described with reference to an accompanying drawing. In addition, in each figure, the same code | symbol is attached | subjected to the same or equivalent part, and the overlapping description is abbreviate | omitted. In the following, the horizontal direction is the direction of the X-axis and the Y-axis, and the vertical direction (the vertical direction) is the direction of the Z-axis.

[Summary of flashless molding machine]

1 is a perspective view of a front side of a flashless molding machine according to an embodiment. The flashless molding machine 1 is a molding machine for molding the upper mold and the lower mold of the casting mold. As shown in FIG. 1, the flashless molding machine 1 is provided with the molding part A1 and the conveyance part A2. In the molding portion A1, a box-shaped upper mold and a lower mold are operable in the vertical direction (Z-axis direction). The conveying unit A2 introduces the match plate on which the model is arranged to the molding unit A1. The upper mold and the lower mold of the molding part A1 move closer to each other to sandwich the match plate. In the upper mold and into the lower mold, molds are filled. Molding yarns filled in the upper mold and into the lower mold are pressed from the vertical direction by the squeeze mechanism provided in the molding part A1 to simultaneously form the upper mold and the lower mold. Thereafter, the upper mold is removed from the upper mold, and the lower mold is removed from the lower mold, respectively, and taken out of the apparatus. In this way, the flashless molding machine 1 molds the upper mold and the lower mold of the casting mold.

[Frame structure]

2 is a front view of a flashless molding machine according to an embodiment. 3 is a schematic view of the left side of the flashless molding machine according to the embodiment; As shown in FIGS. 2 and 3, the flashless molding machine 1 has an upper frame 10, a lower frame 11, and four guides 12 connecting the upper frame 10 and the lower frame 11. ). The guide 12 has an upper end connected to the upper frame 10, and a lower end connected to the lower frame 11. The frame of the molding part A1 mentioned above is comprised by the upper frame 10, the lower frame 11, and four guides 12. As shown in FIG.

The support frame 13 (FIG. 2) of the conveyance part A2 is arrange | positioned at the side (negative direction of an X-axis) of the frame of the shaping | molding part A1. Moreover, the support frame 14 (FIG. 3) extended in an up-down direction is arrange | positioned at the side (positive direction of a Y-axis) of the frame of the shaping | molding part A1. The support frame 14 supports the 1st lower sand tank mentioned later.

[Upper mold and lower mold]

The flashless molding machine 1 has an upper mold 15. The upper mold frame 15 is a box-shaped frame with an upper end and a lower end opened. The upper mold 15 is movably mounted to the four guides 12. The upper mold 15 is supported by the upper mold cylinder 16 mounted to the upper frame 10 and moves up and down along the guide 12 in accordance with the operation of the upper mold cylinder 16.

The flashless molding machine 1 has a lower mold 17 arranged under the upper mold 15. The lower mold 17 is a box-shaped frame with an upper end and a lower end opened. The lower mold 17 is movably mounted to four guides 12. The lower mold 17 is supported by two lower mold cylinders 18 (FIG. 2) mounted to the upper frame 10, along the guide 12 in accordance with the operation of the lower mold cylinder 18. Move up and down. Hereinafter, the area | region enclosed by the guide 12 is also called a molding position.

The match plate 19 (FIG. 2) is introduce | transduced from the conveyance part A2 between the upper mold 15 and the lower mold 17. As shown in FIG. The match plate 19 is a plate-shaped member in which a model is disposed on both sides thereof, and moves between the upper mold 15 and the lower mold 17. As a specific example, the support frame 13 of the conveyance part A2 and the rail which turn to a shaping | molding position. The roller mounting type conveying plate 20 arrange | positioned on the rail and the conveying cylinder 21 which operate the conveying plate 20 are provided. The match plate 19 is disposed on the conveying plate 20, and by the operation of the conveying cylinder 21, it is a molding position and is disposed between the upper mold 15 and the lower mold 17. The upper mold 15 and the lower mold 17 are capable of sandwiching the arranged match plate 19 from the vertical direction. Hereinafter, the area on the support frame 13 is also called a retracted position.

[Sand tank]

The flashless molding machine 1 has an upper sand tank 22 disposed above the upper mold 15. The upper sand tank 22 is attached to the upper frame 10. More specifically, the upper sand tank 22 is fixed to the upper frame 10 statically. The upper sand tank 22 has the storage chamber S1 which stores the molding sand for supplying to the upper mold 15 in the inside. The upper sand tank 22 has its upper end and lower end opened. The upper end of the upper sand tank 22 is provided with a slide gate 23 for sliding the plate-shaped shielding member in the horizontal direction (the positive direction of the X axis). By the operation of the slide gate 23, the upper end part of the upper sand tank 22 is comprised so that opening and closing is possible. Moreover, above the upper sand tank 22, the molding sand injection | throwing-in chute 24 which injects molding sand is fixedly arranged. The mold injection | throwing-in chute 24 is mentioned later. When the slide gate 23 is in the open state, the molding sand is supplied to the upper sand tank 22 through the molding sand injection chute 24.

The lower end of the upper sand tank 22 is opened, and the upper plate 25 (FIG. 3) is attached to the lower end of the opening. The upper plate 25 is a plate-like member and has at least one supply port communicating from the upper sand tank 22 into the upper mold 15. The mold sand in the upper sand tank 22 is supplied into the upper mold 15 through the supply port of the upper plate 25. The upper plate 25 is approximately equal in size to the opening of the upper mold 15. By moving the upper mold 15 upward, the upper plate 25 enters the upper mold 15. By moving the upper mold 15 downward, the upper plate 25 exits from within the upper mold 15. In this way, the upper plate 25 is configured to be able to move back and forth in the upper mold frame 15. Details of the upper plate 25 will be described later.

The upper sand tank 22 is connected to a compressed air source (not shown). As a specific example, the upper sand tank 22 is connected with piping 80-83 (FIGS. 2, 5-7) which supplies compressed air, and is connected with the compressed air source through piping 80-83. Doing. The vacuum proportional valves 90-93 (an example of a control valve, FIG. 2, FIGS. 5-7) are provided in piping 80-83. The vacuum proportional valve 92 not only switches supply and stop of the compressed air, but also automatically adjusts the valve opening amount according to the pressure on the output side. For this reason, compressed air of predetermined pressure is supplied to the upper sand tank 22. When the slide gate 23 is in the closed state, compressed air is sent into the upper sand tank 22. The mold sand in the upper sand tank 22 is supplied into the upper mold 15 through the supply port of the upper plate 25 together with the compressed air. The detail of the supply mechanism of compressed air is mentioned later.

Moreover, the storage chamber S1 of the upper sand tank 22 has the 1st permeation | transmission member 22a (FIG. 3) which has the some hole which the compressed air can distribute | circulate in the inner surface. Thereby, since compressed air is supplied to the whole storage chamber S1 through the whole surface of the 1st permeable member 22a, the fluidity | liquidity of a casting mold improves. The first permeable member 22a may be formed of a porous material. The upper sand tank 22 is connected with the piping 29 (FIG. 2) which exhausts compressed air. Compressed air passes through the first permeable member 22a when exhausted from the pipe 29. Since this 1st permeable member 22a permeates compressed air without passing the mold sand, it can be avoided that the mold sand goes out of the upper sand tank 22.

The flashless molding machine 1 has a lower sand tank for storing mold sand fed into the lower mold 17. The lower sand tank is divided into the 1st lower sand tank 30 (FIG. 3) and the 2nd lower sand tank 31 (FIG. 3) as an example. The first lower sand tank 30 is disposed on the side of the upper sand tank 22. The 1st lower sand tank 30 has the storage chamber S2 which stores the molding sand for supplying to the lower casting mold 17 in its inside.

The 1st lower sand tank 30 is supported by the support frame 14, and is attached to the guide frame 12A (FIG. 1) extended up and down provided in the support frame 14 so that a movement is possible. More specifically, the first lower sand tank 30 is supported by the lower tank cylinder (adjustment drive unit) 32 (FIG. 3) attached to the upper frame 10, and is operated for the operation of the lower tank cylinder 32. Along the guide 12A.

The upper end part of the 1st lower sand tank 30 is open. A slide gate 33 (FIG. 3) is provided at the upper end of the first lower sand tank 30 to slide the plate-shaped shielding member in the horizontal direction (the positive direction of the X axis). By the operation of the slide gate 33, the upper end part of the 1st lower sand tank 30 is comprised so that opening and closing is possible. Moreover, the hopper 34 (FIG. 3) for injecting molding sand is fixedly arrange | positioned above the 1st lower sand tank 30. As shown in FIG. The connection relationship between the hopper 34 and the molding sand injection chute 24 is mentioned later. When the slide gate 33 is in the open state, the mold sand is supplied to the first lower sand tank 30 through the hopper 34.

The lower end part of the 1st lower sand tank 30 is bent in the horizontal direction (negative direction of the Y-axis), and the front end part is provided with the 1st connection hole 35 (FIG. 3) which discharges the stored mold yarn. The 1st connector 35 is comprised so that a 2nd connector of the 2nd lower sand tank 31 mentioned later and a predetermined height (connection position) can be connected. The mold sand is supplied to the second lower sand tank 31 through the first connector 35. Moreover, the 1st blocking plate 36 (FIG. 3) extended in an up-down direction is provided in the front-end | tip part of the 1st lower sand tank 30. As shown in FIG. The 2nd connection port of the 2nd lower sand tank 31 mentioned later is shielded by the 1st blocking plate 36 when it is not located in a connection position.

The first lower sand tank 30 is connected to a compressed air source (not shown). As a specific example, piping 84-87 (FIG. 9) which supplies compressed air is connected to the 1st lower sand tank 30, and is connected with the compressed air source through piping 84-87. Vacuum proportional valves 94-97 (FIG. 9) are provided in piping 84-87. For this reason, compressed air of a predetermined pressure is supplied to the first lower sand tank 30. When the slide gate 33 is in the closed state, compressed air is supplied into the first lower sand tank 30 when the second connection port of the second lower sand tank 31 described later is in the connecting position. The mold sand in the first lower sand tank 30 is supplied into the second lower sand tank 31 through the first connector 35 together with the compressed air. The detail of the supply mechanism of compressed air is mentioned later.

Moreover, the storage chamber S2 of the 1st lower sand tank 30 has the 2nd permeation | transmission member 30a (FIG. 3) which has the some hole which the compressed air can distribute | circulate in the inner surface. Thereby, since compressed air is supplied to the whole storage chamber S2 through the front surface of the 2nd permeation | transmission member 30a, the fluidity | liquidity of a casting mold improves. The second permeable member 30a may be formed of a porous material. The 1st lower sand tank 30 is connected with the piping (not shown) which exhausts compressed air to the side part. Compressed air passes through the second permeable member 30a when exhausted from the pipe. Since the second permeable member 30a does not pass the mold yarn and allows the compressed air to pass through, the mold yarn can be prevented from going out of the first lower sand tank 30.

The second lower sand tank 31 is disposed below the lower mold 17. The second lower sand tank 31 has a storage chamber S3 therein for storing mold sand for supplying to the lower mold mold 17. The second lower sand tank 31 is movably mounted to the four guides 12 and is supported by the squeeze cylinder (drive part) 37 extending in the vertical direction so as to be movable.

On the side part of the 2nd lower sand tank 31, the 2nd connection port 38 (FIG. 3) which can be connected to the 1st connection port 35 of a 1st lower sand tank is formed. The 2nd connector 38 is comprised so that connection with the 1st connector 35 of the 1st lower sand tank 30 at predetermined height (connection position) is possible. A connection position is the height which the 1st connector 35 and the 2nd connector 38 connect, and, specifically, it is a position where the 1st connector 35 and the 2nd connector 38 are coaxially arrange | positioned. The 1st connector 35 and the 2nd connector 38 are connected in the connection surface along an up-down direction.

The first lower sand tank 30 and the second lower sand tank 31 are in communication with each other by connecting the first connector 35 and the second connector 38 at a predetermined connection position. The mold sand is supplied from the first lower sand tank 30 to the second lower sand tank 31 through the first connector 35 and the second connector 38. Moreover, the 2nd closure plate 39 (FIG. 3) extended in an up-down direction is provided in the 2nd connection port 38 of the 2nd lower sand tank 31. As shown in FIG. Guide rails (not shown) for guiding the second closure plate 39 are provided at both side portions of the first connector 35 of the first lower sand tank 30. By guiding the second closing plate 39 by the guide rail, the first connector 35 and the second connector 38 are guided to the connecting position without tilting each other. The first connector 35 of the first lower sand tank 30 is shielded by the second closure plate 39 when it is not located at the connecting position.

In addition, the flashless molding machine 1 may be provided with the sealing mechanism which seals the connection surface of the 1st connection tool 35 and the 2nd connection tool 38 airtightly. For example, the sealing mechanism is provided on the side of the first connector 35.

The upper end of the second lower sand tank 31 is opened, and the lower plate 40 (FIG. 3) is attached to the opening of the upper end. The lower plate 40 is a plate-shaped member and has at least one supply port communicating from the second lower sand tank 31 into the lower mold 17. The mold sand in the second lower sand tank 31 is supplied into the lower mold 17 through a supply port of the lower plate 40 and a lower filling mold described later.

[Lower peeling mold]

The flashless molding machine 1 includes a lower filling mold 41 as an example. The lower filling mold 41 is disposed below the lower mold 17. The lower peeling mold 41 is a box-shaped frame body having an upper end and a lower end opened. The opening of the upper end of the lower peeling mold 41 is connected with the opening of the lower end of the lower casting mold 17. The lower peeling mold 41 is configured to accommodate the second lower sand tank 31 therein. The lower peeling mold 41 is supported to be movable by the lower peeling mold cylinder 42 fixed to the second lower sand tank 31. The lower plate 40 is approximately equal in size to the openings of the lower filling mold 41 and the lower mold 17. In addition, the position which accommodated the 2nd lower sand tank 31 and the lower plate 40 in the inside of the lower peeling mold 41 which can move | move is a home position (initial position), and becomes a descending end. . As the lower filling mold 41 moves upward, the lower plate 40 exits from within the lower filling mold 41. When the lower peeling mold 41 which has moved upward moves downward, the lower plate 40 enters the lower peeling mold 41. In this way, the lower plate 40 is configured to be able to move in and out of the lower peeling mold 41. Since the flashless molding machine 1 has a lower peeling mold 41, the stroke of the lower mold mold 17 can be shortened, so that the device height is lower than that of the case where the lower peeling mold 41 is not provided. It can be done with a flashless molding machine. In addition, since the flaskless molding machine 1 has a lower peeling mold 41, the stroke of the lower mold 17 can be shortened, thereby reducing the molding time of one set of the upper mold and the lower mold. .

In addition, the flashless molding machine 1 does not have to include the lower peeling mold 41. In this case, the lower plate 40 is configured to be able to move in and out of the lower mold 17. The lower casting mold 17 which can be moved is the home position (initial position) of the lower end. That is, the lower plate 40 enters the lower mold 17 by moving upward relative to the lower mold 17 moving upward. The lower plate 40 moves out of the lower mold 17 by moving downward relative to the lower mold 17.

[Modeling space and squeeze]

The molding space (upper molding space) of the upper mold is formed by the upper plate 25, the upper mold frame 15, and the match plate 19. The molding space (lower molding space) of the lower mold is formed by the lower plate 40, the lower mold 17 and the match plate 19. The upper mold space and the lower mold space operate the upper mold cylinder 16, the lower mold cylinder 18 and the squeeze cylinder 37, and the upper mold 15 and the lower mold 17 are predetermined heights. It is formed when the match plate is sandwiched at. In addition, when the flaskless molding machine 1 has a lower peeling mold 41, the lower molding space includes a lower plate 40, a lower mold 17, a lower peeling mold 41 and a match plate 19. ) May be formed.

The upper molding space is filled with mold sand stored in the upper sand tank 22 through the upper plate 25. The lower molding space is filled with molds stored in the second lower sand tank 31 through the lower plate 40. Compressed air is used for filling. The process of filling the molding sand into the upper molding space and the lower molding space while flowing the molding sand using compressed air is called aeration. 4 is a schematic view of the left surface side of the flashless molding machine in the aeration process. As shown in Fig. 4, when the upper mold 15 and the lower mold 17 sandwich the match plate 19 at a predetermined height, the mold yarn is supplied to the molding space by compressed air.

The CB of the molding machine filled in the upper molding space and the lower molding space can be set in the range of 30% to 42%. In addition, the compressive strength of the molding sand filled in the upper molding space and the lower molding space can be set in the range of 8N / cm ² to 15N / cm ² . In addition, since the thickness of the mold to be molded varies depending on the model shape or CB (Compactability) of the molding company, the target height of the second lower sand tank 31 changes according to the thickness of the mold. That is, the height of the 2nd connection port 38 of the 2nd lower sand tank 31 changes. At this time, the height of the first connection port 35 of the first lower sand tank 30 is adjusted to the connection position of the second connection port 38 of the second lower sand tank 31 by the lower tank cylinder 32. do. This adjustment can be realized by the control apparatus 50 (FIG. 3) mentioned later.

The squeeze cylinder 37 moves the second lower sand tank 31 upward while the mold is filled in the upper molding space and the lower molding space, thereby squeezing the squeeze into the upper plate 25 and the lower plate 40. Do it. As a result, pressure is applied to the mold sand in the upper molding space, thereby forming the upper mold. At the same time, pressure is applied to the molding sand of the lower molding space to form the lower mold.

[Mold mold injection suit]

The mold injection | throwing-in chute 24 has the upper end opening and branched into two lower ends. A switching damper 43 is provided at the upper end portion. The switching damper 43 is inclined in such a manner that the mold is dropped to any one of the branched lower ends. In addition, one lower end portion of the molding sand injection chute 24 is fixed to the upper portion of the upper sand tank 22, and the other lower end portion of the molding sand injection chute 24 is accommodated in the hopper 34 and is not fixed. As described above, the lower end portion on the side of the first lower sand tank 30 is not fixed, so that the lower tank cylinder 32 raises the height of the first connector 35 of the first lower sand tank 30 to the upper sand tank ( Can be controlled independently from 22).

[Supply structure of compressed air]

Each of the upper sand tank 22, the first lower sand tank 30, and the second lower sand tank 31 has at least one supply chamber connected to the compressed air source. "Connected" means that the gas is in communication with each other. The supply chamber may be arranged to surround the storage chamber. The storage chamber and the supply chamber communicate with each other through the through holes. Compressed air is sent from a compressed air source to a supply chamber, and compressed air is sent from a supply chamber to a storage chamber through a permeation | transmission member or a some vent hole.

Hereinafter, the supply structure of the compressed air in each tank is demonstrated. First, the supply structure of the compressed air in the upper sand tank 22 is demonstrated. 5 is a schematic view of the left side of the supply structure of compressed air for the upper sand tank. 6 is a schematic view of the back side of a supply structure of compressed air for an upper sand tank. 7 is a schematic view of an upper surface side of a supply structure of compressed air for an upper sand tank.

As shown in FIGS. 5-7, the upper sand tank 22 is an example, The 1st supply chamber S4 located in the upper end side rather than the center of the upper sand tank 22, and the center of the upper sand tank 22 are shown. Furthermore, it has the 2nd supply chamber S5 located in the lower end side. The center of the upper sand tank 22 is the center of the axial direction of the upper sand tank 22. The 1st supply chamber S4 and the 2nd supply chamber S5 are provided in the side of the storage chamber S1. The first supply chamber S4 and the second supply chamber S5 are spaces provided to surround the storage chamber S1. The 1st supply chamber S4 is partitioned between the side wall 22b of the storage chamber S1, and the piping member 22c provided in the outer side of the side wall 22b of the storage chamber S1. The 2nd supply chamber S5 is partitioned between the side wall 22b of the storage chamber S1, and the piping member 22d provided in the outer side of the side wall 22b of the storage chamber S1.

Pipes 80 and 83 are connected to the first supply chamber S4. The piping 80 and 83 are connected to the position which the piping member 22c opposes each other. The pipes 80 and 83 are connected to the main pipe 100 connected to the compressed air source. The vacuum proportional valve 90 is provided in the piping 80. The vacuum proportional valve 93 is provided in the piping 83. Vacuum proportional valves 90 and 93 are disposed on the side of the upper sand tank 22. The vacuum proportional valve is connected to the control apparatus 50 mentioned later, and is a valve opened and closed based on the control signal of the control apparatus 50. The first supply chamber S4 communicates with the storage chamber S1 through a through hole (not shown). When the vacuum proportional valves 90 and 93 are opened, the compressed air flows through the pipes 80 and 83 from the main pipe 100 and is supplied to the first supply chamber S4. Then, compressed air is sent from the first supply chamber S4 to the storage chamber S1 through the through hole and the first permeable member 22a. In addition, a plurality of through holes may be formed in the side wall 22b of the storage chamber S1. For example, the plurality of through holes may be formed to surround the storage chamber S1. In this case, compressed air can be sent evenly from the circumferential direction toward the storage chamber S1.

Pipes 81 and 82 are connected to the second supply chamber S5. Pipes 81 and 82 are connected to one side surface of the pipe member 22d. The pipes 81 and 82 are connected to the main pipe 100 connected to the compressed air source. The pipe 81 is provided with a vacuum proportional valve 91. The pipe 82 is provided with a vacuum proportional valve 92. Vacuum proportional valves 91 and 92 are disposed on the side of the upper sand tank 22. The second supply chamber S5 communicates with the storage chamber S1 through a through hole (not shown). When the vacuum proportional valves 91 and 92 are opened, the compressed air flows through the pipes 81 and 82 from the main pipe 100 and is supplied to the second supply chamber S5. Then, compressed air is sent from the second supply chamber S5 to the storage chamber S1 through the through hole and the first permeable member 22a. In addition, a plurality of through holes may be formed in the side wall 22b of the storage chamber S1. For example, the plurality of through holes may be formed to surround the storage chamber S1. In this case, compressed air can be sent evenly from the circumferential direction toward the storage chamber S1.

Next, the supply structure of the compressed air in the 1st lower sand tank 30 and the 2nd lower sand tank 31 is demonstrated. 8 is a schematic view of the left side of the supply structure of compressed air for the first lower sand tank and the second lower sand tank. 9 is a schematic view of the back side of a supply structure of compressed air for the first lower sand tank and the second lower sand tank. 10 is a partially enlarged view of the bottom of the device of FIG. 8;

As shown in FIGS. 8-10, the 1st lower sand tank 30 is an example, and the 3rd supply chamber S6 located in the center of the 1st lower sand tank 30, of the 1st lower sand tank 30 is shown, for example. 4th supply chamber S7 located in the upper end side rather than the center, and 5th supply chamber S8 located in the lower end side rather than the center of the 1st lower sand tank 30 are provided. The center of the first lower sand tank 30 is the center in the axial direction of the first lower sand tank 30. The third supply chamber S6 and the fourth supply chamber S7 are provided on the side of the storage chamber S2. The fifth supply chamber S8 is provided at the curved lower end portion of the first lower sand tank 30.

The third supply chamber S6 and the fourth supply chamber S7 are spaces provided to surround the storage chamber S2. The 3rd supply chamber S6 is partitioned between the side wall 30c of the storage chamber S2, and the piping member 30d provided in the outer side of the side wall 30c of the storage chamber S2. The 4th supply chamber S7 is partitioned between the side wall 30c of the storage chamber S2, and the piping member 22d provided in the outer side of the side wall 30c of the storage chamber S2.

The pipe 84a is connected to the 3rd supply chamber S6. The piping 84a is connected to one side surface of the piping member 30d. The pipe 84a is connected to the main pipe 100 connected to the compressed air source through the pipe 84. In the pipe 84, a vacuum proportional valve 94 is provided. The vacuum proportional valve 94 is disposed on the side of the first lower sand tank 30. The third supply chamber S6 communicates with the storage chamber S2 through a through hole (not shown). When the vacuum proportional valve 94 is opened, the compressed air flows through the pipes 84 and 84a from the main pipe 100 and is supplied to the third supply chamber S6. And compressed air is sent to the storage chamber S2 from the 3rd supply chamber S6 through the through-hole and the 2nd permeable member 30a. In addition, a plurality of through holes may be formed in the side wall 30c of the storage chamber S2. For example, the plurality of through holes may be formed so as to surround the storage chamber S2. In this case, compressed air can be sent evenly from the circumferential direction toward the storage chamber S2.

The piping 84b is connected to 4th supply chamber S7. The pipe 84b is connected to one side surface of the pipe member 30g. The pipe 84b is connected to the main pipe 100 connected to the compressed air source through the pipe 84. The pipe 84 is provided with a vacuum proportional valve 94. That is, the vacuum proportional valve 94 controls the flow rates of both the pipes 84a and 84b. The vacuum proportional valve 94 is disposed on the side of the first lower sand tank 30. The fourth supply chamber S7 communicates with the storage chamber S2 through a through hole (not shown). When the vacuum proportional valve 94 is opened, the compressed air flows through the pipes 84 and 84b from the main pipe 100 and is supplied to the fourth supply chamber S7. Then, compressed air is sent from the fourth supply chamber S7 to the storage chamber S2 through the through hole and the second permeable member 30a. In addition, a plurality of through holes may be formed in the side wall 30c of the storage chamber S2. For example, the plurality of through holes may be formed to surround the storage chamber S2. In this case, compressed air can be sent evenly from the circumferential direction toward the storage chamber S2.

The fifth supply chamber S8 is formed inside the inspection door 70. The inspection door 70 is a door that is opened and closed at the time of maintenance of the first lower sand tank 30. 11 is a cross-sectional view of the check door. As shown in FIG. 11, the inspection door 70 is a hollow member and the 5th supply chamber S8 is partitioned inside. In the outer side surface 70a of the inspection door 70, the supply port 70b which connects with the piping 85 which supplies compressed air is formed. A through hole 70d for supplying compressed air to the storage chamber S2 is formed in the inner side surface 70c of the inspection door 70. One through hole 70d may be formed, or a plurality of through holes 70d may be formed. The vent hole 70e in which the slit was formed is inserted in the through hole 70d.

As shown in FIGS. 8-10, the piping 85 is connected to 5th supply chamber S8. The pipe 85 is connected to the supply port 70b. The pipe 85 is connected to the main pipe 100 connected to the compressed air source. The pipe 85 is provided with a vacuum proportional valve 95. The vacuum proportional valve 95 is disposed on the side of the first lower sand tank 30. The fifth supply chamber S8 communicates with the storage chamber S2 through the plurality of vent holes 70e. When the vacuum proportional valve 95 is opened, the compressed air flows through the pipe 85 from the main pipe 100 and is supplied to the fifth supply chamber S8. Then, compressed air is sent from the fifth supply chamber S8 to the storage chamber S2 through the plurality of vent holes 70e.

The second permeable member 30a is not interposed in the flow passage sent from the fifth supply chamber S8 to the storage chamber S2. In the curved lower end part of the 1st lower sand tank 30, since the shape, abrasion of the permeable member arrange | positioned in the storage chamber S2 tends to become large compared with other arrangement positions. For this reason, in the storage chamber S2 of the curved lower end part of the 1st lower sand tank 30, the some vent hole 70e is used instead of the 2nd permeable member 30a. As a result, clogging of the permeable member is avoided at the curved lower end of the first lower sand tank 30.

As an example, the second lower sand tank 31 has a sixth supply chamber S9 and a seventh supply chamber S10 positioned at the bottom of the storage chamber S3. The sixth supply chamber S9 is partitioned inside the piping member 71. The piping member 71 is arrange | positioned at the bottom part near the 2nd connection port 38 of the 2nd lower sand tank 31. FIG. The piping member 71 is provided with the supply port 71a which connects with the piping which supplies compressed air, and the through-hole 71b for supplying compressed air to the storage chamber S3. One through hole 71b may be formed, or a plurality of through holes 71b may be formed. Vent holes (not shown) in which slits are formed are fitted into the through holes 71b. The piping member 72 is provided with the supply port 72a which connects with the piping which supplies compressed air, and the through-hole 72b for supplying compressed air to the storage chamber S3. One through hole 72b may be formed, or a plurality of through holes 72b may be formed. Vent holes (not shown) in which slits are formed are fitted into the through holes 72b.

The pipe 86 is connected to the 6th supply chamber S9. The pipe 86 is connected to the supply port 71a. The pipe 86 is connected to the main pipe 100 connected to the compressed air source. The pipe 86 is provided with a vacuum proportional valve 96. The sixth supply chamber S9 communicates with the storage chamber S3 through the plurality of vent holes. When the vacuum proportional valve 96 is opened, the compressed air flows through the pipe 86 from the main pipe 100 and is supplied to the sixth supply chamber S9. Then, the compressed air is sent from the sixth supply chamber S9 to the storage chamber S3 through the plurality of vent holes.

The pipe 87 is connected to the seventh supply chamber S10. The pipe 87 is connected to the supply port 72a. The pipe 87 is connected to the main pipe 100 connected to the compressed air source. In the pipe 87, a vacuum proportional valve 97 is provided. The seventh supply chamber S10 communicates with the storage chamber S3 through the plurality of vent holes. When the vacuum proportional valve 97 is opened, compressed air flows through the pipe 87 from the main pipe 100 and is supplied to the seventh supply chamber S10. Then, compressed air is sent from the seventh supply chamber S10 to the storage chamber S3 through the plurality of vent holes.

The permeable member is not interposed in the flow path sent from the sixth supply chamber S9 and the seventh supply chamber S10 to the storage chamber S2. The second lower sand tank 31 tends to have greater wear of the permeable member disposed in the storage compartment than other tanks. For this reason, in the storage chamber S3 of the 2nd lower sand tank 31, some vent hole is used instead of the permeable member. As a result, clogging of the permeable member is avoided in the second lower sand tank 31.

[Pressure detector]

The flashless molding machine 1 may be equipped with at least one pressure detector. The at least one pressure detector detects the pressure of at least one of the upper sand tank 22, the first lower sand tank 30, and the second lower sand tank 31. The pressure detector includes, for example, a main body portion, a diaphragm accommodated in the main body portion and deformed by pressure, and a strain gauge for outputting a signal according to the deformation of the diaphragm. The pressure detector may be provided with an indicator (for example, an LED (Light Emitting Diode) indicator) or the like in the main body portion. As the mounting method of the pressure detector, various methods can be adopted. For example, it may be attached to the side wall of the storage chamber or may be attached to the side wall of the space communicated with the storage chamber.

Hereinafter, arrangement | positioning of the pressure detector in each tank is demonstrated. First, the arrangement of the pressure detector in the upper sand tank 22 will be described. As shown in FIG. 3, the upper sand tank 22 is provided with a first pressure detector 61 and a second pressure detector 62. The first pressure detector 61 detects the pressure of the first supply chamber S4. The second pressure detector 62 detects the pressure of the second supply chamber S5. Thus, in the upper sand tank 22, the space (1st supply chamber S4, 2nd supply chamber S5) of the outer side of the storage chamber S1 which communicates with the storage chamber S1 via the 1st permeable member 22a. Pressure is detected.

Next, the arrangement of the pressure detector in the first lower sand tank 30 will be described. As shown in FIG. 3, the first lower sand tank 30 is provided with a third pressure detector 63, a fourth pressure detector 64, and a fifth pressure detector 65. The third pressure detector 63 detects the pressure in the third supply chamber S6 and the fourth supply chamber S7. The fourth pressure detector 64 detects the pressure of the storage chamber S2. The fifth pressure detector 65 detects the pressure of the fifth supply chamber S8. As described above, in the first lower sand tank 30, the pressure of the storage chamber S2 is directly detected, and the space outside the storage chamber S2, which communicates with the storage chamber S2 through the second permeable member 30a ( The pressure of 3rd supply chamber S6, 4th supply chamber S7, and 5th supply chamber S8 is detected. In addition, the pressure of the storage chamber S2 detected by the 4th pressure detector 64 is used as a reference pressure of the backflow prevention at the time of exhaust mentioned later.

Next, the arrangement of the pressure detector in the second lower sand tank 31 will be described. As shown in FIG. 3, the second lower sand tank 31 is provided with a sixth pressure detector 66. The sixth pressure detector 66 detects the pressure in the storage chamber S3. In addition, the 6th pressure detector 66 may detect the pressure of the space of the outer side of the storage chamber S3 which communicates with the storage chamber S3 through a vent etc.

[The details of wearing of pressure detector]

The arrangement of the pressure detectors (1st pressure detector 61-3rd pressure detector 63, 5th pressure detector 65) which detects the pressure of the space outside of a storage chamber is demonstrated. Since each of these pressure detectors has the same connection form, it demonstrates on behalf of the 3rd pressure detector 63. As shown in FIG. 12 is an example of connection of a third pressure detector. As shown in FIG. 12, inside the side wall 30c of the 1st lower sand tank 30, the 2nd permeable member 30a is attached through the rubber member 30f. The through hole 30e is formed in the side wall 30c. 30 d of piping members which form the 3rd supply chamber S6 are attached to the outer side of the side wall 30c at the position corresponding to the through-hole 30e. The third supply chamber S6 communicates with the storage chamber S2 through the through hole 30e and the second transmission member 30a. In the 3rd supply chamber S6, the connection port (not shown) to which compressed air is supplied is provided. The compressed air supplied from the connection port passes through the through hole 30e and the second permeable member 30a and is supplied into the storage chamber S2 of the first lower sand tank 30. Thus, the 1st pressure detector 61-the 3rd pressure detector 63, and the 5th pressure detector 65 detect the pressure of the space of the outer side of a storage chamber which communicates with a storage chamber through a permeable member.

[controller]

The flashless molding machine 1 may be equipped with the control apparatus 50 (an example of a control part). The control device 50 is a computer including a control unit such as a processor, a storage unit such as a memory, an input unit, an input / output unit such as a display device, a communication unit such as a network card, and the like. For example, it controls a mold sand feed system, a compressed air supply system, a drive system and a power system. In this control apparatus 50, an operator can perform a command input operation etc. in order to manage the flashless molding machine 1, and the display apparatus of the flashless molding machine 1 Operational status can be visualized and displayed. The storage unit of the control device 50 includes a control program for controlling various processes executed by the flashless molding machine 1 by the processor, and each component of the flashless molding machine 1 in accordance with molding conditions. The program for executing the process is stored.

The control apparatus 50 is connected to the 1st pressure detector 61-the 6th pressure detector 66, and acquires the detection result of at least 1 pressure detector. Control based on the pressure detection result will be described later.

[Molding processing]

The shaping | molding process which concerns on this embodiment is demonstrated schematically. It is a flowchart explaining the shaping | molding process of the flashless molding machine which concerns on one Embodiment. The molding process shown in FIG. 13 is a process for molding one set of the upper mold and the lower mold. The molding process shown in FIG. 13 is automatically started under the condition that the posture of the flaskless molding machine 1 is at the original position (initial position). When the posture of the flashless molding machine 1 is not the original position, it is operated manually and moved to the original position. In the posture (home position) of the flashless molding machine 1 shown in FIG. 3, when the auto start button is pressed, the molding process shown in FIG. 13 is started.

When the molding process is started, the shuttle in process (S12) is performed first. In the shuttle-in process, the conveyance cylinder 21 moves the conveyance plate 20 which mounted the match plate 19 to the molding position.

Next, the frame set processing (S14) is performed. In the mold set processing, the upper mold flask cylinder 16, the lower mold flask cylinder 18 (FIG. 2), the lower filling mold cylinder 42, and the squeeze cylinder 37 expand and contract to the thickness of the mold to be molded. As a result, the upper mold 15 moves to the predetermined position, the lower mold 17 abuts the match plate 19, and then the lower mold 17 on which the match plate 19 is placed. ) Moves to a predetermined position, whereby the match plate 19 is sandwiched between the upper mold 15 and the lower mold 17. Then, the second lower sand tank 31 and the lower peeling mold 41 rise, and the lower peeling mold 41 abuts on the lower mold mold 17. Moreover, the lower tank cylinder 32 expands and contracts and moves the 1st lower sand tank 30 to an up-down direction, and the height of the 1st connection hole 35 of the 1st lower sand tank 30 raises the 2nd lower sand tank. It will be in the state corresponded with the height of the 2nd connection port 38 of (31). At this time, the upper molding space and the lower molding space are in a state (height) determined by the control device 50.

Next, aeration processing S16 is performed. As shown in FIG. 4, in the aeration process, the sealing mechanism seals the first connector 35 of the first lower sand tank 30 and the second connector 38 of the second lower sand tank 31. Then, the slide gate 23 of the upper sand tank 22 and the slide gate 33 of the first lower sand tank 30 are closed, and the upper portion is opened by the compressed air source and the vacuum proportional valves 90 to 97. Compressed air is supplied to the sand tank 22, the first lower sand tank 30, and the second lower sand tank 31. As a result, the molding sand is filled in the upper molding space and the lower molding space while the molding sand flows. As an example, when the set pressure and time are satisfied, the aeration process ends. In addition, after completion of the aeration treatment, exhaust treatment in the upper sand tank 22, the first lower sand tank 30, and the second lower sand tank 31 is performed.

Next, squeeze processing (S18) is performed. In the squeeze treatment, the sealing mechanism operated in the aeration process S16 releases the sealing, and the squeeze cylinder 37 is further extended, so that the second lower sand tank 31 is further raised. As a result, the lower plate 40 mounted on the second lower sand tank 31 enters the lower peeling mold 41 to compress molds in the lower molding space, and the upper plate 25 is upper. It enters into the mold 15 and compresses the mold yarn of the upper molding space. In the case where the squeeze cylinder 37 is controlled by the hydraulic circuit, the squeeze processing is terminated when, for example, the hydraulic pressure of the hydraulic circuit can be determined to be equivalent to the set hydraulic pressure. In addition, when the squeeze process is being performed and the upper mold flask cylinder 16, the lower mold flask cylinder 18, and the lower peeling mold cylinder 42 are controlled by the hydraulic circuit, each cylinder is set to a free circuit. As a result, each cylinder is pushed by the squeeze force and contracted.

Next, the mold releasing process S20 is performed. In the footing treatment, the lower peeling mold cylinder 42 is contracted to lower the lower peeling mold 41. Thereafter, the squeeze cylinder 37 is contracted to lower the second lower sand tank 31, followed by lowering the lower mold 17 on which the match plate 19 and the conveying plate 20 are placed. . Then, the model is shaped from the upper mold frame 15. When the lower mold 17 is lowered to the fixing part (not shown), the match plate 19 and the conveying plate 20 are supported by the fixing part. As a result, the model is shaped from the lower mold 17.

Next, shuttle out processing (S22) is performed. In the shuttle-out process, the conveyance cylinder 21 contracts and the conveyance plate 20 is moved to a retracted position. If necessary, the center is arranged in the upper mold 15 or in the lower mold 17.

Next, frame alignment processing (S24) is performed. In the mold fitting process, the lower mold flask cylinder 18 is contracted and the squeeze cylinder 37 is extended to raise the lower mold mold 17 and the second lower sand tank 31 to form a mold.

Next, the frame unwinding process S26 is performed. In the mold extraction processing, the upper mold flask cylinder 16 and the lower mold flask cylinder 18 are contracted to raise the upper mold flask 15 and the lower mold flask 17 to the rising end, and the mold ejection is performed.

Next, the first frame separation processing S28 is performed. In the 1st mold separation process, in the state which mounted the mold on the lower plate 40 of the 2nd lower sand tank 31, the squeeze cylinder 37 is contracted and the 2nd lower sand tank 31 is lowered. . At this time, the lower mold cylinder 18 is extended to lower the lower mold mold 17 and to stop at a position that does not interfere when the mold is taken out.

Next, mold extrusion process S30 is performed. In the mold extrusion process, the extrusion cylinder 48 (see FIG. 2) is extended to carry out the upper mold and the lower mold out of the apparatus (for example, a molding line).

Next, a second frame separation process S32 is performed. In the second mold separating process, the lower mold cylinder 18 is extended to return the lower mold mold 17 to its original position.

The processing for molding one set of the upper mold and the lower mold is completed.

[Pressure detection in sand tank]

14 is a functional block diagram of a flashless molding machine according to an embodiment. As shown in FIG. 14, the flashless molding machine 1 includes a first pressure detector 61 to a sixth pressure detector 66, a control device 50, a display unit 67, and a vacuum proportional valve 90 to 97. ).

The control apparatus 50 is connected to the 1st pressure detector 61-the 6th pressure detector 66, and can acquire a detection result. The detection result is information about the pressure output from at least one pressure detector among the first pressure detector 61 to the sixth pressure detector 66.

The control device 50 includes a calculation unit 51, a communication unit 52, and a storage unit 53. The calculating part 51 is a component which performs various calculations regarding pressure control, and is implement | achieved by a processor, a memory, etc. The communication unit 52 is a component for transmitting information out of the apparatus, and is realized by a network card or the like.

The communication unit 52 processes the data in accordance with the communication standard based on the command of the operation unit 51 and outputs the data to the communication network 68. The communication network 68 may be wireless communication or wired communication. The storage unit 53 is a component that stores data, and is realized by a memory or the like.

The display unit 67 is a device capable of displaying information in a viewable state. The display unit 67 is an example of a display device. The display unit 67 may be fixed to the apparatus or may be separate from the apparatus. The display unit 67 displays the detection result of the at least one pressure detector based on the control signal from the control device 50. The display unit 67 may display alarm information based on the control signal from the control device 50. The display part 67 may be comprised with the touch panel etc. which receive an input operation by an operator. The display unit 67 may output the input operation by the operator to the control device 50.

Hereinafter, the control process of the control apparatus 50 is demonstrated corresponding to each component.

[First data display processing]

The 1st data display process is a process which displays the result detected by the 1st pressure detector 61-6th pressure detector 66 on the display part 67 during execution of the shaping | molding process of FIG. The timing of the display may be during the molding process or after the molding process. The calculating part 51 of the control apparatus 50 causes the display part 67 to display the graph which shows the relationship of a pressure and time as a detection result of the 1st pressure detectors 61-6. The calculating part 51 may display the control information of the vacuum proportional valves 90-97 on the display part 67 according to a detection result. The control information is information about a control signal of the vacuum proportional valve. For example, the control signal of a vacuum proportional valve is a signal which converted the control signal into the pressure based on a predetermined calculation formula. This conversion is executed by the calculation unit 51. The calculating part 51 of the control apparatus 50 makes the display part 67 display the control information and a detection result in a comparable aspect. For example, the calculating part 51 of the control apparatus 50 screen-displays control information and a detection result at the same timing. The calculating part 51 superimposes and compares the data to compare on the same graph as an example. The calculating part 51 may arrange and display the object data to compare as each graph in the same screen. In addition, the comparable aspect is not limited to the case where the object data to compare is screen-displayed at the same timing, and the object data to compare may be displayed on the screen alternately.

It is an example of the graph which shows the control signal of a vacuum proportional valve, and the detection result of a pressure detector. The graph shown in FIG. 15 is a detection result in the upper sand tank 22, a horizontal axis is time, and a vertical axis is pressure. In Fig. 15, the control signal of the vacuum proportional valve is converted into pressure and shown by broken lines. That is, the broken line in a figure is a target pressure. The time from the rising to falling of the waveform of a broken line is aeration time T1. In Fig. 15, the detection result is shown by the solid line. The thick solid line is the detection result of the first pressure detector 61, and the thin solid line is the detection result of the second pressure detector 62. The operator can confirm the validity of the control and the like based on the graph shown in FIG. 15.

As an example, in the graph shown in FIG. 15, the pressure in the upper sand tank 22 increases at the beginning of the aeration time T1. As shown by timing E1 in the figure, the increase in pressure is once terminated. It can be considered that the end of the increase in pressure occurs because the molding sand in the upper sand tank 22 flows. Thereafter, as shown in timing E2 in the figure, the pressure starts to rise again. The rise in pressure can be thought to be due to the completion of the mold injection. Then, as time passes from the timing E2, the pressure rises slightly to become a constant value. The operator or the like can verify the length of the aeration time T1 based on the graph shown in FIG. 15. The operator or the like can set the length of the aeration time T1 on the setting screen described later. For example, the operator or the like may adjust the aeration time T1 such that the end timing of the aeration time T1 approaches timing E2. The operator or the like may adjust the aeration time T1 such that the end timing of the aeration time T1 approaches the timing after the margin time T2 has elapsed from the timing E2. Margin time T2 is a value determined based on actual measurement. The margin time T2 may be a value appropriately set by an operator or the like. By such adjustment, the cycle time can be shortened and the amount of air consumed can be optimized.

[Second data display processing]

The second data display process is a process of causing the display unit 67 to display the result detected by the first pressure detector 61 to the sixth pressure detector 66. The timing of the display is when the blockage of the first permeable member 22a or the second permeable member 30a is checked, for example, during maintenance. The calculating part 51 of the control apparatus 50 is an example, The display part 67 shows the graph which shows the relationship between a pressure and time as a detection result of at least 1 of the 1st pressure detector 61-the 3rd pressure detector 63. As shown in FIG. ). Since the first pressure detector 61 to the third pressure detector 63 communicate with the storage chamber via the first permeable member 22a or the second permeable member 30a, the first pressure detector 61 to the first pressure detector 61. The clogging of the 1st permeable member 22a or the 2nd permeable member 30a can be detected by the detection result of the pressure of the 3 pressure detector 63. As shown in FIG.

The blockage of the permeable member is judged by the worker or the like. In order to assist the judgment of the worker or the like, the threshold value may be displayed together with the detection result of the pressure. For example, the calculating part 51 of the control apparatus 50 may detect the detection result of the at least 1 pressure detector (the 1st pressure detector 61 and the 2nd pressure detector 62) of the upper sand tank 22 previously, The set threshold value is displayed on the display section 67 in a comparable manner. Alternatively, the calculation unit 51 may display the pressure detected by the third pressure detector 63 of the first lower sand tank 30 and the preset threshold value on the display unit 67 in a comparable manner. The preset threshold may be stored in the storage unit 53. For example, a value obtained by subtracting a predetermined value from the observed abnormal value may be set as a threshold and stored in the storage unit 53. The control apparatus 50 may acquire a threshold value through a touch panel etc., and may store it in the memory | storage part 53. FIG. The calculating part 51 may display the control information of the vacuum proportional valves 90-94 on the display part 67 according to a detection result. The control information is information about a control signal of the vacuum proportional valve. For example, the control signal of a vacuum proportional valve is a signal which converted the control signal into the pressure based on a predetermined calculation formula. This conversion is executed by the calculation unit 51.

It is an example of the graph which shows the detection result of a pressure detector, and a threshold value. The graph shown in FIG. 16 is a detection result in the upper sand tank 22, a horizontal axis is time, and a vertical axis is pressure. In FIG. 16, a thick solid line is an ideal value, a broken line is a threshold value, and a thin solid line is a detection result of a pressure detector. When the blockage occurs in the first permeable member 22a, the pressure rises and the threshold value is exceeded. The operator can confirm the presence or absence of blockage of the permeable member based on the graph shown in FIG.

[Third data display processing]

3rd data display process is a process which displays the result detected by the 1st pressure detector 61-6th pressure detector 66 on the display part 67 during execution of the shaping | molding process of FIG. The timing of the display may be during the molding process or after the molding process. The calculating part 51 of the control apparatus 50 causes the display part 67 to display the graph which shows the relationship of a pressure and time as a detection result of the 1st pressure detectors 61-6. The calculating part 51 may display the control information of the vacuum proportional valves 90-97 on the display part 67 according to a detection result. The control information is information about a control signal of the vacuum proportional valve. For example, the control signal of a vacuum proportional valve is a signal which converted the control signal into the pressure based on a predetermined calculation formula. This conversion is executed by the calculation unit 51.

The calculating part 51 of the control apparatus 50 memorize | stores the detection result of the 1st pressure detector 61-the 6th pressure detector 66 in the memory | storage part 53 at a predetermined timing. And the calculating part 51 causes the display part 67 to display the memorize | stored detection result and this detection result in a comparable aspect. For example, the calculating part 51 refers to the memory | storage part 53, acquires the detection result previously stored, and obtains this detection result from the 1st pressure detector 61-the 6th pressure detector 66. Acquire. And the calculating part 51 displays the detection result previously stored and this detection result on the screen at the same timing. The calculating part 51 superimposes and compares the data to compare on the same graph as an example. The calculating part 51 may arrange and display the object data to compare as each graph in the same screen. In addition, the comparable aspect is not limited to the case where the object data to compare is screen-displayed at the same timing, and the object data to compare may be displayed on the screen alternately.

17 is an example in which the detection result stored beforehand is compared with this detection result. The graph shown in FIG. 17 is a detection result in the upper sand tank 22, a horizontal axis is time, and a vertical axis is pressure. Screen example (A) is a screen displaying graph G1 of detection results stored in advance. The screen example (B) is a screen displaying the graph G1 of the detection result stored beforehand and the graph G2 of the detection result superimposed previously. The operator can confirm the presence or absence of the difference from the previous process based on the graph shown in FIG.

[Display processing of setting screen]

The calculating part 51 displays the setting screen on the display part 67 as an example of setting processing. The setting screen is a screen for setting the aeration setting pressure and time. And the calculating part 51 sets aeration setting pressure and time based on the input information of the operator received via the input part (not shown) etc. As an example, the calculating part 51 sets aeration time, pressure, a threshold value, etc. The setting is stored in the storage unit 53 as a target value, for example.

18 shows an example of the screen displayed by the display unit. Screen example (A) is an example of a setting screen for setting aeration time. In the upper portion of the screen example (A), an icon IC1 for accepting an input operation for transitioning a page is displayed. In the lower part of the screen, an icon IC2 for accepting an input operation for calling an application or various functions is displayed. In the center of the screen, setting targets and setting items are displayed. An example of a setting object is a vacuum proportional valve. In the screen example (A), the vacuum proportional valves 90 and 93 and the vacuum proportional valves 90 and 93 are displayed as the objects OB1 and OB2. Examples of setting items are aeration time and pressure. In screen example (A), aeration time and pressure are displayed as objects OB3 to OB5. The objects OB3 to OB5 are items that can be input by an operator or the like.

In addition, an example of a setting item is aeration time and pressure at the time of a further process. The further processing is not executed when the aeration processing is normal. The additional processing is a processing performed to extend the aeration time before it is determined that the aeration processing is abnormal. The details of the further processing will be described later. In screen example (A), the aeration time and pressure at the time of further processing are displayed as the object OB6. The object OB6 is an item that can be input by an operator or the like. The setting item received in the object OB6 becomes a setting value at the time of further aeration. The operator or the like can set a setting relating to aeration by inputting values into the objects OB3 to OB6.

[Alarm processing]

The control device 50 alerts when an abnormality is detected. An alarm means informing an operator of an abnormality. The control apparatus 50 displays the screen regarding an alarm on the display part 67 as an example of an alarm process. The control apparatus 50 may substitute an alarm by a display, or may output an alarm with respect to the speaker not shown in addition to the alarm by a display.

One of the abnormalities assumed in the flashless molding machine performed by using the compressed air is the omission or more. A missing abnormality is "a phenomenon in which the point where mold injection sand does not exist by partial blockage of each supply port of the lower plate 40 arises, and this point becomes the length which a compressed air passes." Since there is less air resistance at the point where there is no mold sand, the compressed air only exits to the point. For this reason, when an abnormality arises, a pressure will not rise. The control device 50 extends the aeration time (additional processing) when it is determined that normal charging of the mold injection mold is not performed at the time of aeration processing. That is, the control apparatus 50 outputs a control signal to at least 1 vacuum proportional valve based on the detection result of the 1st pressure detector 61-6th pressure detector 66. As shown in FIG. As a more specific example, in the case of aeration processing, when the maximum pressure detected by the pressure detector within the aeration time T1 does not reach a predetermined threshold value, the control device 50 is not performing normal filling of the molding die. Determine. The predetermined threshold value is stored in the storage unit 53, for example. And the control apparatus 50 outputs a control signal to a vacuum proportional valve based on the value set using the screen example (A) of FIG. 18, for example (additional process which extends an aeration time).

When the abnormality is eliminated by the further processing, that is, when the maximum pressure detected by the pressure detector within the additional aeration time reaches a predetermined threshold, the filling process of the mold mold is normal. Judgment is not made. On the other hand, when the maximum pressure detected by the pressure detector within the additional aeration time does not reach a predetermined threshold, the control device 50 outputs alarm information. The alarm information is data relating to an alarm. When the alarm information is output to the display unit 67, the alarm information is alarm data. The control device 50 may stop the operation of the flashless molding machine 1 together with the output of the alarm information. Screen example (B) in FIG. 18 is an example of an alarm. The control device 50 causes the display unit 67 to display the above contents, the operation state of the flashless molding machine 1, the treatment (action method), the return (return method) and the like.

The control apparatus 50 performs an exhaust process, when aeration time T1 is complete | finished. In the exhaust treatment, the compressed air in the upper sand tank 22 is exhausted, and the pressure decreases. When the exhaust mechanism is clogged with sand, for example, as shown in the graph G3 of the screen example (B) of FIG. 17, the drop in pressure is slowed at the exhaust treatment time T3. When the control device 50 exhausts the upper sand tank 22, the first lower sand tank 30, and the second lower sand tank 31, the pressure detected by the at least one pressure detector is a predetermined time. If it does not go below a predetermined threshold after the elapse, alarm information is output. Thereby, the operator or the like can recognize the abnormality of the exhaust.

In addition, the control apparatus 50 may output a control signal at the time of exhaust processing so that at least 1 vacuum proportional valve may open based on the detection result of at least 1 pressure detector. By operating in this way, since the pressure of a supply chamber becomes high, the backflow of the molding sand from a charging chamber to a supply chamber is prevented. Reverse flow of the molding die is likely to occur at the point where the vent is disposed, that is, in the supply chambers S8 to S10. In the exhaust treatment process, the control device 50 supplies a control signal so that the vacuum proportional valves 95 to 97 are opened based on the pressure detected by the fourth pressure detector 64 which becomes a reference during the exhaust treatment process. Output The control device 50 may open the vacuum proportional valves 95 to 97 so that the pressure is higher by a predetermined value than the pressure detected by the fourth pressure detector 64 (feedback processing).

As described above, in the flashless molding machine 1 according to the present embodiment, the pressure of the upper sand tank 22, the first lower sand tank 30, and the second lower sand tank 31 is determined by the first pressure detector 61. Is detected by the sixth pressure detector 66. And the detection result of the 1st pressure detector 61-6th pressure detector 66 is acquired by the control apparatus 50. Thus, according to the flashless molding machine 1, since the situation in a sand tank is grasped | ascertained by the pressure in a tank being acquired, the outstanding mold and casting product can be obtained as a result.

According to the flashless molding machine 1, when a squeeze process is performed by moving a 2nd lower sand tank to an up-down direction, the situation in a sand tank can be grasped | ascertained suitably.

According to the flashless molding machine 1, for arranging the first pressure detector 61 to the sixth pressure detector 66, supply chambers S4 to S10 for supplying compressed air can be used. In addition, the flashless molding machine 1 does not need to provide a through hole for pressure detection in the storage chambers S1 to S3 storing the molding sand. For this reason, according to the flashless molding machine 1, the influence which arrangement | positioning of the 1st pressure detector 61-6th pressure detector 66 has on a shaping process can be made small.

According to the flashless molding machine 1, since the pressures above and below the upper sand tank 22, that is, the entire pressure of the upper sand tank 22, are detected, the pressure deviation depends on the detection position of the upper sand tank 22. Can be identified. The flashless molding machine 1 detects the first lower sand tank 30 because the upper and lower pressures of the first lower sand tank 30, that is, the entire pressure of the first lower sand tank 30, are detected. The pressure deviation depending on the position can be identified.

According to the flashless molding machine 1, clogging of the 1st permeable member 22a and the 2nd permeable member 30a can be detected. Moreover, in the flashless molding machine 1, in the storage chamber S2 of the curved lower end part of the 1st lower sand tank 30, or in the 2nd lower sand tank 31, a some vent instead of a permeation | transmission member. Use the hall. For this reason, according to the flashless molding machine 1, the clogging of the permeable member can be avoided at the point where clogging of the permeable member is likely to occur.

According to the flashless molding machine 1, the operator can be informed of the detection result of the 1st pressure detector 61-the 6th pressure detector 66. FIG. According to the flashless molding machine 1, it is possible to notify the operator of the time dependence of the pressure. According to the flashless molding machine 1, the setting screen is displayed on the display unit 67, whereby the setting operation by the operator can be supported. In addition, according to the flashless molding machine 1, the operator can be informed of the difference between the detection result stored in advance and the current detection result. According to the flashless molding machine 1, the detection result of the 1st pressure detector 61-the 6th pressure detector 66 can be transmitted to an external computer etc. through a physical storage medium.

According to the flashless molding machine 1, the detection result of a pressure detector and a predetermined threshold value can be displayed on a display part in a comparable aspect. In this case, clogging of the first permeable member 22a or the second permeable member 30a can be predicted with respect to the operator.

According to the flashless molding machine 1, the control signal can be output to the vacuum proportional valve based on the detection result of the pressure detector, so that feedback control can be performed, for example. For example, in the flashless molding machine 1, when evacuating, a control signal is output so that the vacuum proportional valves 95 to 97 are opened based on the detection result of the third pressure detector 63. For this reason, according to the flashless molding machine 1, the flow of the molding sand in a tank can be controlled preferably. More specifically, the flashless molding machine 1 can prevent the mold injection back from the storage chambers S2 and S3 to the supply chambers S8 to S10.

According to the flashless molding machine 1, the operator can be warned that the exhaust system is defective. According to the flashless molding machine 1, since the vacuum proportional valves 90-97 are arrange | positioned at the side of a sand tank, the response of supply of compressed air can be improved.

According to the flashless molding machine 1, additional aeration can be automatically performed when the maximum pressure does not reach a predetermined threshold. In addition, according to the flashless molding machine 1, the operator can be alerted when the situation is not improved by the additional aeration.

In addition, embodiment mentioned above shows an example of the flashless molding machine which concerns on this indication. The flashless molding machine according to the present disclosure is not limited to the flashless molding machine 1 according to the embodiment, and the flashless molding machine 1 according to the embodiment is not limited to the scope described in each claim. ) May be modified or applied to others.

For example, in the said embodiment, although the upper sand tank 22 demonstrated the example fixed to the upper frame 10, the upper sand tank 22 may be comprised so that a movement is possible. Moreover, the sand tank of a molding machine does not need to be three, one may be sufficient, and two or four or more may be sufficient as it.

One… Flashless molding machine 12... guide
15... Upper mold 16.. Upper mold cylinder
17... Lower mold 18. Lower mold cylinder
19... Match plate 22... Upper sand tank
25... Top plate 22a... First transmission member
30a... Second transmission member 30... 1st bottom sand tank
31... Second lower sand tank 32... Lower tank cylinder
35... . First connection port 36.. 1st obstruction plate
37... Squeeze cylinder 38.. Second connection
39... Second occlusion plate 40... Bottom plate
41... Lower peeling mold 42. Lower filling cylinder
50... Control unit 51... Calculator
52... Communication unit 53. Memory
61... First pressure detector 62. Second pressure detector
63... Third pressure detector 64. Fourth pressure detector
65... Fifth pressure detector 67. Display
68... Communication network 90 ~ 97... Vacuum proportional valve

Claims (23)

A flashless molding machine for molding an upper mold and a lower mold of a moldless mold,
Upper mold,
A lower mold disposed under the upper mold and capable of holding a match plate together with the upper mold;
An upper sand tank disposed above the upper mold and connected to a compressed air source, the lower end of which is opened, and stores mold sand therein;
An upper plate mounted at a lower end of the upper sand tank, the upper plate having at least one feed port communicating with the upper mold from the upper sand tank;
A first lower sand tank having a first connection port connected to a compressed air source, storing mold sand therein, and discharging the stored mold sand;
It is disposed below the lower mold, has an upper end thereof, and has a second connector that is connectable to the first connector of the first lower sand tank, and is supplied from the first lower sand tank and supplied into the lower mold. A second lower sand tank for storing molded sand,
A lower plate mounted to an upper end of the second lower sand tank, the lower plate having at least one supply port communicating from the second lower sand tank to the lower mold;
At least one pressure detector for detecting pressure of at least one of the upper sand tank, the first lower sand tank and the second lower sand tank;
And a control unit connected to the pressure detector, the control unit obtaining a detection result of the at least one pressure detector. The method according to claim 1,
A drive unit which moves the second lower sand tank in the vertical direction and squeezes the upper plate and the lower plate;
And a control drive for moving the first lower sand tank in a vertical direction. The method according to claim 1 or 2,
The upper sand tank has a storage chamber for storing the mold sand and at least one supply chamber provided at a side of the storage chamber and connected to a compressed air source,
And the at least one pressure detector detects the pressure of the at least one supply chamber of the upper sand tank. The method according to claim 3,
The at least one supply chamber of the upper sand tank includes a first supply chamber located above the center of the upper sand tank, and a second supply chamber located below the center of the upper sand tank.
And the at least one pressure detector comprises a first pressure detector for detecting the pressure in the first supply chamber and a second pressure detector for detecting the pressure in the second supply chamber. The method according to claim 3 or 4,
The storage compartment of the upper sand tank has a first permeable member having a plurality of holes through which compressed air can flow through an inner surface thereof,
The at least one supply chamber of the upper sand tank communicates with the storage chamber of the upper sand tank through the first permeable member. The method according to any one of claims 1 to 5,
The first lower sand tank has a storage chamber for storing the mold sand and at least one supply chamber provided at a side of the storage chamber and connected to a compressed air source,
And the at least one pressure detector detects the pressure of the at least one supply chamber of the first lower sand tank. The method according to claim 6,
The at least one supply chamber of the first lower sand tank includes a third supply chamber located at the center of the first lower sand tank, a fourth supply chamber located at an upper end side of the first lower sand tank, and A fifth supply chamber located at a lower end side than the center of the first lower sand tank,
The at least one pressure detector includes a third pressure detector for detecting the pressure in the third supply chamber, a fourth pressure detector for detecting the pressure in the fourth supply chamber, and a fifth pressure detector for detecting the pressure in the fifth supply chamber. Including, a flaskless molding machine. The method according to claim 7,
The storage chamber of the first lower sand tank has a second permeable member having a plurality of holes through which compressed air can flow through an inner surface thereof,
And the third supply chamber and the fourth supply chamber communicate with the storage chamber of the first lower sand tank through the second permeable member. The method according to claim 7 or 8,
And the fifth supply chamber is provided at the bent lower end of the first lower sand tank, and communicates with the storage chamber of the first lower sand tank through a plurality of vent holes. The method according to any one of claims 1 to 9,
The second lower sand tank has a storage chamber for storing the mold sand and at least one supply chamber provided at a bottom of the storage chamber and connected to a compressed air source.
And the at least one pressure detector detects the pressure of the at least one supply chamber of the second lower sand tank. The method according to claim 10,
At least one supply chamber of the second lower sand tank communicates with the storage chamber of the second lower sand tank through a plurality of vent holes. The method according to any one of claims 1 to 11,
And a display unit connected to the control unit, the display unit displaying a detection result of the at least one pressure detector. The method according to claim 12,
And the control unit causes the display unit to display a graph indicating a relationship between pressure and time as the detection result. The method according to claim 12 or 13,
And the control unit displays a setting screen for setting aeration setting pressure and time on the display unit. The method according to any one of claims 12 to 14,
A storage unit that stores detection results of the at least one pressure detector,
And the control unit causes the display unit to display the detection result stored in the storage unit and the detected detection result this time in a comparable manner. The method according to any one of claims 1 to 14,
The control unit has a flashless molding machine having a communication unit for transmitting the detection result of the at least one pressure detector through a communication network. The method according to claim 5,
A display unit connected to the control unit and displaying a detection result of the at least one pressure detector,
And the control unit displays a detection result of the at least one pressure detector of the upper sand tank and a preset threshold on the display unit in a comparable manner. The method according to claim 8,
A display unit connected to the control unit and displaying a detection result of the at least one pressure detector,
And the control unit causes the display unit to display the pressure detected by the third pressure detector or the fourth pressure detector and a preset threshold value in a comparable manner. The method according to any one of claims 1 to 18,
At least one control valve capable of opening and closing according to a control signal is provided between each of the upper sand tank, the first lower sand tank and the second lower sand tank, and a compressed air source.
And the control unit outputs the control signal to the at least one control valve based on a detection result of the at least one pressure detector. The method according to claim 19,
The control unit controls the at least one control valve to be opened based on a detection result of the at least one pressure detector when exhausting the upper sand tank, the first lower sand tank, and the second lower sand tank. Flaskless molding machine which outputs a signal. The method according to claim 19 or 20,
The control unit, when exhausting the upper sand tank, the first lower sand tank and the second lower sand tank, the alarm information when the pressure detected by the at least one pressure detector does not fall below a predetermined threshold value; Outputting, a flaskless molding machine. The method according to any one of claims 19 to 21,
The control valve corresponding to the upper sand tank is disposed on the side of the upper sand tank,
The control valve corresponding to the first lower sand tank is disposed on the side of the first lower sand tank. The method according to any one of claims 1 to 22,
The control unit extends the aeration time when the maximum pressure detected by the pressure detector within a predetermined aeration time does not reach a predetermined threshold in the aeration process, and after the extension, the at least one. And output alarm information when the maximum pressure detected by the two pressure detectors does not reach a predetermined threshold value.

Images