WO2018207646A1

WO2018207646A1 - Flaskless mold machine

Info

Publication number: WO2018207646A1
Application number: PCT/JP2018/017056
Authority: WO
Inventors: 斗紀也寺部; 功一坂口; 豊波多野
Original assignee: 新東工業株式会社
Priority date: 2017-05-12
Filing date: 2018-04-26
Publication date: 2018-11-15
Also published as: US20200061696A1; KR20200007002A; CN110603110A; BR112019019063A2; EP3586997A4; TW201900298A; EP3586997A1; JP6973481B2; JPWO2018207646A1; MX2019013052A

Abstract

A flaskless mold machine according to the present invention includes: an upper flask; a lower flask; an upper sand tank; an upper plate attached to the lower end of the upper sand tank; a first lower sand tank; a second lower sand tank that accommodates molding sand supplied from the first lower sand tank; a lower plate that is attached to the upper end of the second lower sand tank and that has at least one supply port communicating between the second lower sand tank and the interior of the lower flask; at least one pressure detector that detects the pressure in at least one of the upper sand tank, the first lower sand tank, and the second lower sand tank; and a control unit that is connected to the pressure detector and acquires the detection result from the at least one pressure detector.

Description

Frame making machine

This disclosure relates to a frame making machine.

Patent Document 1 discloses a frame making machine that forms a frameless mold without a casting frame. This molding machine includes a pair of upper and lower casting frames that sandwich a match plate on which a model is installed, a supply mechanism that supplies mold sand, and a squeeze mechanism that compresses mold sand. The molding machine brings the lower casting frame closer to the upper casting frame and sandwiches the match plate between the upper casting frame and the lower casting frame. In this state, the molding machine operates the supply mechanism to supply the molding sand to the upper and lower molding spaces formed by the upper casting frame and the lower casting frame. The molding machine compresses the molding sand in the upper and lower molding spaces by operating a squeeze mechanism. Through the above steps, an upper mold and a lower mold are formed simultaneously.

The supply mechanism of this molding machine supplies the molding sand to the upper and lower molding spaces using compressed air. The supply mechanism includes an upper sand tank that communicates with a compressed air source and stores mold sand, and an upper blow head that is disposed above the upper casting frame and is 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 supplies the mold sand of the upper blow head to the upper molding space defined by the upper casting frame. Similarly, the supply mechanism communicates with a compressed air source, and is arranged in a lower sand tank for storing mold sand, and a lower blow tank that is disposed at the lower part of the lower casting frame, moves up and down, and is connected to the lower sand tank at a predetermined position. And a head. 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 supplies the mold sand of the lower blow head to the lower casting frame.

The squeeze mechanism of this frame making machine is equipped with an upper squeeze cylinder and a lower squeeze cylinder that face each other vertically. The upper squeeze cylinder applies downward pressure to the molding sand in the upper molding space, and the lower squeeze cylinder applies upward pressure to the molding sand in the lower molding space. This increases the hardness of the sand mold.

JP 54-51930 A

In an apparatus for supplying mold sand to a molding space using compressed air, such as a frame making machine described in Patent Document 1, sand clogging may occur in the sand tank. However, the frame making machine described in Patent Document 1 cannot grasp the situation in the sand tank. Such sand clogging affects the moldability of the mold and the quality of the cast product. In this technical field, there is a demand for a frame making machine for making excellent molds or cast products.

A blank frame molding machine according to one aspect of the present disclosure is a blank frame molding machine that molds an upper mold and a lower mold of a non-cast frame, and is disposed below the upper cast frame and the upper cast frame. And a lower casting frame that can hold the match plate, an upper sand tank that is disposed above the upper casting frame, connected to a compressed air source, has a lower end opened, and stores mold sand therein. An upper plate attached to the lower end of the sand tank and formed with at least one supply port communicating from the upper sand tank into the upper casting frame, is connected to a compressed air source, and mold sand is stored therein. A first lower sand tank having a first connection port for discharging the molded sand, and a first lower sand tank disposed below the lower casting frame, having an upper end opened and connectable to the first connection port of the first lower sand tank. It has two connection ports and is supplied from the first lower sand tank into the lower casting frame. A second lower sand tank for storing mold sand to be fed; and a lower bottom tank attached to an upper end of the second lower sand tank and having at least one supply port communicating from the second lower sand tank into the lower casting frame. A plate, at least one pressure detector for detecting the pressure of at least one of the upper sand tank, the first lower sand tank and the second lower sand tank; and at least one pressure detection connected to the pressure detector And a control unit for acquiring the detection result of the vessel.

In this frame making 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 at least one pressure detector. Then, the detection result of at least one pressure detector is acquired by the control unit. Thus, since the situation in the sand tank is grasped by acquiring the pressure in the tank, according to this apparatus, an excellent mold and casting product can be obtained as a result.

In one embodiment, the frame making machine moves the second lower sand tank in the vertical direction to drive the upper plate and the lower plate to squeeze, and the adjustment drive moves the first lower sand tank in the vertical direction. May be provided. When comprised in this way, the state in a sand tank is grasped | ascertained in the apparatus in which a squeeze process is performed by a 2nd lower sand tank moving to an up-down direction.

In one embodiment, the upper sand tank may include a storage chamber for storing the mold sand and at least one supply chamber provided on a side of the storage chamber and connected to a compressed air source. The at least one pressure detector may detect the pressure in at least one supply chamber of the upper sand tank. When configured in this way, the device can utilize a supply chamber for supplying compressed air for the placement of the pressure detector.

In one embodiment, the at least one supply chamber of the upper sand tank includes a first supply chamber located on the upper end side of the center of the upper sand tank and a second supply chamber located on the lower end side of the center of the upper sand tank. And may be included. The at least one pressure detector may include a first pressure detector that detects the pressure in the first supply chamber and a second pressure detector that detects the pressure in the second supply chamber. When configured in this manner, the upper and lower pressures of the upper sand tank, that is, the pressure of the entire upper sand tank is detected. For this reason, this apparatus can grasp the pressure deviation depending on the detection position of the upper sand tank.

In one embodiment, the storage chamber of the upper sand tank may have a first permeable member having a plurality of holes through which compressed air can circulate. The at least one supply chamber of the upper sand tank may communicate with the storage chamber of the upper sand tank via the first transmission member. When configured in this manner, this apparatus can detect clogging of the first transmission member.

In one embodiment, the first lower sand tank may include a storage chamber that stores the mold sand, and at least one supply chamber that is provided on a side of the storage chamber and connected to a compressed air source. The at least one pressure detector may detect a pressure in at least one supply chamber of the first lower sand tank. When configured in this way, the device can utilize a supply chamber for supplying compressed air for the placement of the pressure detector.

In one embodiment, 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 and a fourth position located on the upper end side of the center of the first lower sand tank. You may include a supply chamber and the 5th supply chamber located in the lower end side rather than the center of a 1st lower sand tank. The at least one pressure detector detects a pressure in the third supply chamber, a fourth pressure detector for detecting the pressure in the fourth supply chamber, and a pressure in the fifth supply chamber. And a fifth pressure detector. When configured in this manner, the upper and lower pressures of the first lower sand tank, that is, the entire pressure of the first lower sand tank is detected. For this reason, this apparatus can grasp | ascertain the pressure deviation depending on the detection position of a 1st lower sand tank.

In one embodiment, the storage chamber of the first lower sand tank may have a second permeable member having a plurality of holes through which compressed air can circulate. The third supply chamber and the fourth supply chamber may communicate with the storage chamber of the first lower sand tank via the second transmission member. When configured in this manner, this apparatus can detect clogging of the second transmission member.

In one embodiment, the fifth supply chamber may be provided at the bent lower end of the first lower sand tank, and may communicate with the storage chamber of the first lower sand tank through a plurality of vent holes. When configured in this manner, this apparatus can detect pressure at the lower end of the first lower sand tank, which tends to cause clogging of the transmission member. Further, at the bent lower end portion of the first lower sand tank, the wear of the transmission member arranged in the storage chamber tends to be larger than other arrangement positions because of its shape. This apparatus uses a plurality of vent holes instead of the permeable member in the storage chamber at the bent lower end of the first lower sand tank. For this reason, this apparatus can avoid generation | occurrence | production of the clogging of a permeation | transmission member in the bent lower end part of a 1st lower sand tank.

In one embodiment, the second lower sand tank may include a storage chamber for storing the mold sand, and at least one supply chamber provided at the bottom of the storage chamber and connected to a compressed air source. The at least one pressure detector may detect the pressure of at least one supply chamber of the second lower sand tank. When configured in this way, the device can utilize a supply chamber for supplying compressed air for the placement of the pressure detector.

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

In one embodiment, the frame making machine may include a display unit that is connected to the control unit and displays a detection result of at least one pressure detector. When configured in this way, this apparatus can notify the operator of the detection result of the pressure detector.

In one embodiment, the control unit may cause the display unit to display a graph indicating the relationship between pressure and time as a detection result. When configured in this manner, this apparatus can notify the operator of the pressure time dependency.

In one embodiment, the control unit may cause the display unit to display a setting screen for setting the aeration set pressure and time. When configured in this manner, this apparatus can support a setting operation by an operator.

In one embodiment, the frame making machine may include a storage unit that stores a detection result of at least one pressure detector. The control unit may cause the display unit to display the detection result stored in the storage unit and the detected current detection result in a comparable manner. When configured in this way, this device can notify the operator of the difference between the previous detection result and the current detection result.

In one embodiment, the control unit may include a communication unit that transmits a detection result of at least one pressure detector via a communication network. When configured in this manner, this apparatus can transmit the detection result of the pressure detector to an external computer or the like without using a physical storage medium.

In one embodiment, the frame making machine may include a display unit that is connected to the control unit and displays a detection result of at least one pressure detector. Then, the control unit may cause the display unit to display a detection result of at least one pressure detector of the upper sand tank and a preset threshold value in a comparable manner. In this case, this apparatus can make the operator predict clogging of the first transmission member.

In one embodiment, the frame making machine may include a display unit that is connected to the control unit and displays a detection result of at least one pressure detector. The control unit may cause 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. In this case, this apparatus can make the operator predict clogging of the second transmission member.

In one embodiment, at least one control valve that can be opened and closed according to a control signal may be provided between the upper sand tank, the first lower sand tank, the second lower sand tank, and the compressed air source. . And a control part may output a control signal to at least one control valve based on a detection result of at least one pressure detector. When configured in this manner, this apparatus can perform, for example, feedback control on the pressure, so that the flow of the mold sand in the tank can be appropriately controlled.

In one embodiment, when the control unit exhausts the upper sand tank, the first lower sand tank, and the second lower sand tank, the control unit opens at least one control valve based on a detection result of the at least one pressure detector. The control signal may be output so that When configured in this manner, this apparatus can prevent the casting sand from flowing backward from the storage chamber to the supply chamber.

In one embodiment, when the control unit exhausts the upper sand tank, the first lower sand tank, and the second lower sand tank, the pressure detected by the at least one pressure detector does not become a predetermined threshold value or less. May output alarm information. With this configuration, this device can warn an operator that there is a problem with the exhaust system.

In one embodiment, the control valve corresponding to the upper sand tank may be disposed on the side of the upper sand tank, and the control valve corresponding to the first lower sand tank is disposed on the side of the first lower sand tank. May be. In such a configuration, since the distance from the tank to the corresponding control valve is shortened, this apparatus can improve the responsiveness of the 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 a predetermined aeration time does not reach a predetermined threshold during the aeration process. And a control part may output warning information, when the maximum pressure detected by the at least 1 pressure detector after extending does not reach a predetermined threshold value. When configured in this manner, the device can automatically perform additional aeration when the maximum pressure does not reach a predetermined threshold. In addition, the device can alert an operator when additional aeration does not improve the situation.

According to various aspects and embodiments of the present disclosure, a frame making machine for forming an excellent mold or cast product is provided.

It is a perspective view of the front side of the frame making machine which concerns on one Embodiment. It is a front view of the frame making machine concerning one embodiment. It is a schematic diagram by the side of the left side of a frame making machine concerning one embodiment. It is a schematic diagram by the side of the left side of a frame making machine at the time of aeration processing. It is a schematic diagram of the left side of the compressed air supply structure for the upper sand tank. It is a schematic diagram of the back side of the supply structure of compressed air regarding an upper sand tank. It is a schematic diagram of the upper surface side of the compressed air supply structure regarding the upper sand tank. It is a schematic diagram of the left side of the compressed air supply structure for the first lower sand tank and the second lower sand tank. It is a schematic diagram of the back side of the supply structure of compressed air about the 1st lower sand tank and the 2nd lower sand tank. It is the elements on larger scale of the apparatus lower part of FIG. It is sectional drawing of an inspection door. It is an example of the connection of a 3rd pressure detector. It is a flowchart explaining the molding process of the frame making machine which concerns on one Embodiment. It is a functional block diagram of the frame making machine which concerns on one Embodiment. It is an example of the graph which shows the control signal of an electropneumatic proportional valve, and the detection result of a pressure detector. It is an example of the graph which shows the detection result and threshold value of a pressure detector. It is an example which compared the detection result memorize | stored beforehand and this detection result. It is an example of a screen displayed by a display part.

Hereinafter, embodiments will be described with reference to the accompanying drawings. In addition, in each figure, the same code | symbol is attached | subjected to the same or an equivalent part, and the overlapping description is abbreviate | omitted. Hereinafter, the horizontal direction is defined as the X-axis and Y-axis directions, and the vertical direction (vertical direction) is defined as the Z-axis direction.

[Outline of punching machine]
FIG. 1 is a perspective view of a front side of a frame making machine according to an embodiment. The blank frame molding machine 1 is a molding machine that molds an upper mold and a lower mold of a non-cast frame. As shown in FIG. 1, the frame making machine 1 includes a molding unit A1 and a transport unit A2. In the molding part A1, a box-shaped upper casting frame and a lower casting frame that are operable in the vertical direction (Z-axis direction) are arranged. The transport unit A2 introduces the match plate on which the model is arranged into the molding unit A1. The upper casting frame and the lower casting frame of the molding part A1 move so as to be close to each other and sandwich the match plate. Mold sand is filled in the upper and lower casting frames. The molding sand filled in the upper casting frame and the lower casting frame is pressurized from above and below by the squeeze mechanism provided in the molding part A1, and the upper casting mold and the lower casting mold are formed simultaneously. Thereafter, the upper mold is extracted from the upper casting frame, and the lower mold is extracted from the lower casting frame, and is carried out of the apparatus. Thus, the frame making machine 1 molds the upper mold and the lower mold of the non-cast frame.

[Frame structure]
FIG. 2 is a front view of the frame making machine according to one embodiment. FIG. 3 is a schematic view of the left side of the frame making machine according to one embodiment. As shown in FIGS. 2 and 3, the frame making machine 1 includes an upper frame 10, a lower frame 11, and four guides 12 that connect 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 upper frame 10, the lower frame 11, and the four guides 12 constitute the frame of the molding part A1 described above.

The support frame 13 (FIG. 2) of the transport unit A2 is disposed on the side of the frame of the molding unit A1 (the negative direction of the X axis). Further, a support frame 14 (FIG. 3) extending in the vertical direction is disposed on the side of the frame of the molding part A1 (positive direction of the Y axis). The support frame 14 supports a first lower sand tank described later.

[Upper and lower casting frames]
The frame making machine 1 includes an upper casting frame 15. The upper casting frame 15 is a box-shaped frame having an upper end and a lower end opened. The upper casting frame 15 is movably attached to the four guides 12. The upper casting frame 15 is supported by an upper casting frame cylinder 16 attached to the upper frame 10, and moves up and down along the guide 12 according to the operation of the upper casting frame cylinder 16.

The blank frame molding machine 1 includes a lower casting frame 17 disposed below the upper casting frame 15. The lower casting frame 17 is a box-shaped frame having an upper end portion and a lower end portion opened. The lower casting frame 17 is movably attached to the four guides 12. The lower casting frame 17 is supported by two lower casting frame cylinders 18 (FIG. 2) attached to the upper frame 10, and moves up and down along the guide 12 according to the operation of the lower casting frame cylinder 18. Hereinafter, the region surrounded by the guide 12 is also referred to as a modeling position.

Between the upper casting frame 15 and the lower casting frame 17, a match plate 19 (FIG. 2) is introduced from the transport unit A2. The match plate 19 is a plate-like member in which models are arranged on both sides thereof, and moves forward and backward between the upper casting frame 15 and the lower casting frame 17. As a specific example, the support frame 13 of the transport unit A2 includes a rail toward the modeling position, a transport plate 20 with a roller disposed on the rail, and a transport cylinder 21 that operates the transport plate 20. . The match plate 19 is disposed on the transport plate 20, and is disposed between the upper casting frame 15 and the lower casting frame 17 at the modeling position by the operation of the transport cylinder 21. The upper casting frame 15 and the lower casting frame 17 can hold the arranged match plate 19 in the vertical direction. Below, the area | region on the support frame 13 is also called retraction position.

[Sand tank]
The blank frame molding machine 1 includes an upper sand tank 22 disposed above the upper casting frame 15. The upper sand tank 22 is attached to the upper frame 10. More specifically, the upper sand tank 22 is statically fixed to the upper frame 10. The upper sand tank 22 has a storage chamber S <b> 1 for storing mold sand to be supplied to the upper casting frame 15. The upper sand tank 22 has an upper end and a lower end opened. A slide gate 23 is provided at the upper end of the upper sand tank 22 to slide the plate-shaped shielding member in the horizontal direction (the positive and negative directions of the X axis). By the operation of the slide gate 23, the upper end portion of the upper sand tank 22 is configured to be openable and closable. A mold sand injection chute 24 for supplying mold sand is fixed above the upper sand tank 22. The mold sand charging chute 24 will be described later. When the slide gate 23 is in the open state, the mold sand is supplied to the upper sand tank 22 through the mold sand charging chute 24.

The lower end of the upper sand tank 22 is opened, and the upper plate 25 (FIG. 3) is attached to the opening at the lower end. The upper plate 25 is a plate-like member and has at least one supply port that communicates from the upper sand tank 22 into the upper casting frame 15. Mold sand in the upper sand tank 22 is supplied into the upper casting frame 15 through a supply port of the upper plate 25. The upper plate 25 has substantially the same size as the opening of the upper casting frame 15. As the upper casting frame 15 moves upward, the upper plate 25 enters the upper casting frame 15. As the upper casting frame 15 moves downward, the upper plate 25 moves out of the upper casting frame 15. Thus, the upper plate 25 is configured to be able to advance and retract within the upper casting 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 to piping 80 to 83 (FIGS. 2 and 5 to 7) for supplying compressed air, and is connected to a compressed air source via the piping 80 to 83. is doing. The pipes 80 to 83 are provided with electro-pneumatic proportional valves 90 to 93 (an example of a control valve, FIGS. 2 and 5 to 7). The electropneumatic proportional valve 92 not only switches the supply and stop of compressed air, but also automatically adjusts the valve opening according to the pressure on the output side. For this reason, compressed air having a predetermined pressure is supplied to the upper sand tank 22. Compressed air is sent into the upper sand tank 22 when the slide gate 23 is closed. The mold sand in the upper sand tank 22 is supplied into the upper casting frame 15 through the supply port of the upper plate 25 together with the compressed air. Details of the compressed air supply mechanism will be described later.

Further, the storage chamber S1 of the upper sand tank 22 has a first transmission member 22a (FIG. 3) having a plurality of holes through which compressed air can circulate. Thereby, since compressed air is supplied to the whole storage chamber S1 through the whole surface of the 1st permeation | transmission member 22a, the fluidity | liquidity of casting sand improves. The first transmission member 22a may be formed of a porous material. The upper sand tank 22 is connected to a pipe 29 (FIG. 2) for exhausting compressed air. The compressed air passes through the first permeable member 22 a when being exhausted from the pipe 29. Since this 1st permeation | transmission member 22a permeate | transmits compressed air without allowing mold sand to pass through, it can avoid that mold sand goes out of the upper sand tank 22. FIG.

The frame making machine 1 includes a lower sand tank that stores mold sand supplied in the lower casting frame 17. As an example, the lower sand tank is divided into a first lower sand tank 30 (FIG. 3) and a second lower sand tank 31 (FIG. 3). The first lower sand tank 30 is disposed on the side of the upper sand tank 22. The first lower sand tank 30 has a storage chamber S <b> 2 for storing mold sand to be supplied to the lower casting frame 17.

The first lower sand tank 30 is supported by the support frame 14 and is movably attached to a vertically extending guide 12A (FIG. 1) provided on the support frame 14. More specifically, the first lower sand tank 30 is supported by a lower tank cylinder (adjustment drive unit) 32 (FIG. 3) attached to the upper frame 10, and is guided to the guide 12 </ b> A according to the operation of the lower tank cylinder 32. Move up and down along.

The upper end of the first lower sand tank 30 is opened. At the upper end of the first lower sand tank 30, a slide gate 33 (FIG. 3) is provided for sliding a plate-shaped shielding member in the horizontal direction (the positive and negative directions of the X axis). By the operation of the slide gate 33, the upper end portion of the first lower sand tank 30 is configured to be openable and closable. In addition, a hopper 34 (FIG. 3) for charging mold sand is fixedly disposed above the first lower sand tank 30. The connection relationship between the hopper 34 and the sand casting chute 24 will be described later. When the slide gate 33 is in an open state, the mold sand is supplied to the first lower sand tank 30 via the hopper 34.

The lower end of the first lower sand tank 30 is bent in the horizontal direction (the negative direction of the Y axis), and a first connection port 35 (FIG. 3) for discharging the stored mold sand is formed at the tip. ing. The first connection port 35 is configured to be connectable to a second connection port of a second lower sand tank 31 described later at a predetermined height (connection position). The molding sand is supplied to the second lower sand tank 31 through the first connection port 35. A first closing plate 36 (FIG. 3) extending in the vertical direction is provided at the tip of the first lower sand tank 30. A second connection port of a second lower sand tank 31 to be described later is shielded by the first closing plate 36 when not located at the connection position.

The first lower sand tank 30 is connected to a compressed air source (not shown). As a specific example, the first lower sand tank 30 is connected to pipes 84 to 87 (FIG. 9) for supplying compressed air, and is connected to a compressed air source via the pipes 84 to 87. The pipes 84 to 87 are provided with electropneumatic proportional valves 94 to 97 (FIG. 9). For this reason, compressed air having a predetermined pressure is supplied to the first lower sand tank 30. Compressed air is supplied into the first lower sand tank 30 when the slide gate 33 is in a closed state and a second connection port of a second lower sand tank 31 described later is in the connection position. Mold sand in the first lower sand tank 30 is supplied into the second lower sand tank 31 through the first connection port 35 together with the compressed air. Details of the compressed air supply mechanism will be described later.

Further, the storage chamber S2 of the first lower sand tank 30 has a second transmission member 30a (FIG. 3) having a plurality of holes through which compressed air can flow on the inner surface. Thereby, since compressed air is supplied to the whole storage chamber S2 through the whole surface of the 2nd permeation | transmission member 30a, the fluidity | liquidity of casting sand improves. The second transmission member 30a may be formed of a porous material. A pipe (not shown) for exhausting compressed air is connected to the side of the first lower sand tank 30. The compressed air passes through the second transmission member 30a when being exhausted from the pipe. Since this 2nd permeation | transmission member 30a permeate | transmits compressed air without allowing mold sand to pass through, it can avoid that mold sand goes out of the 1st lower sand tank 30. FIG.

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

A second connection port 38 (FIG. 3) that can be connected to the first connection port 35 of the first lower sand tank is formed on the side of the second lower sand tank 31. The second connection port 38 is configured to be connectable to the first connection port 35 of the first lower sand tank 30 at a predetermined height (connection position). The connection position is a height at which the first connection port 35 and the second connection port 38 are connected. Specifically, the connection position is a position where the first connection port 35 and the second connection port 38 are arranged coaxially. . The 1st connection port 35 and the 2nd connection port 38 are connected by the connection surface along the up-down direction.

The first lower sand tank 30 and the second lower sand tank 31 are in communication with each other when the first connection port 35 and the second connection port 38 are connected at a predetermined connection position. Mold sand is supplied from the first lower sand tank 30 to the second lower sand tank 31 via the first connection port 35 and the second connection port 38. A second closing plate 39 (FIG. 3) extending in the vertical direction is provided at the second connection port 38 of the second lower sand tank 31. Guide rails (not shown) for guiding the second closing plate 39 are provided on both sides of the first connection port 35 of the first lower sand tank 30. Since the second closing plate 39 is guided by the guide rail, the first connection port 35 and the second connection port 38 are guided to the connection position without being inclined with respect to each other. The first connection port 35 of the first lower sand tank 30 is shielded by the second closing plate 39 when not located at the connection position.

The frame making machine 1 may include a sealing mechanism that hermetically seals the connection surfaces of the first connection port 35 and the second connection port 38. For example, the sealing mechanism is provided on the first connection port 35 side.

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-like member and has at least one supply port that communicates from the second lower sand tank 31 into the lower casting frame 17. The molding sand in the second lower sand tank 31 is supplied into the lower casting frame 17 through a supply port of the lower plate 40 and a lower frame described later.

[Underlay frame]
The blank frame molding machine 1 includes a lower frame 41 as an example. The underlay frame 41 is disposed below the lower casting frame 17. The underlay frame 41 is a box-shaped frame having an upper end portion and a lower end portion opened. The opening at the upper end of the lower frame 41 is connected to the opening at the lower end of the lower casting frame 17. The lower frame 41 is configured to accommodate the second lower sand tank 31 therein. The lower frame 41 is supported by a lower frame cylinder 42 fixed to the second lower sand tank 31 so as to be movable up and down. The lower plate 40 has substantially the same size as the openings of the lower frame 41 and the lower casting frame 17. In addition, the position where the 2nd lower sand tank 31 and the lower plate 40 were accommodated in the inside of the lower filling frame 41 which can move up and down is an original position (initial position), and becomes a descending end. The lower plate 40 moves out from the lower frame 41 by moving the lower frame 41 upward. The lower plate 40 moves into the lower frame 41 as the lower frame 41 moved upward moves downward. Thus, the lower plate 40 is configured to be able to advance and retreat (can enter and exit) within the lower frame 41. Since this frame making machine 1 can shorten the stroke of the lower casting frame 17 by providing the lower frame 41, the frame making machine has a lower apparatus height than the case where the lower frame 41 is not provided. It can be. Moreover, since this blank frame molding machine 1 can shorten the stroke of the lower casting frame 17 by providing the lower frame 41, the molding time of a pair of upper mold and lower mold can be shortened.

Note that the frame making machine 1 does not have to include the underlay frame 41. In this case, the lower plate 40 is configured to be able to advance and retreat (can enter and exit) in the lower casting frame 17. The lower casting frame 17 that can move up and down has its lower end at its original position (initial position). That is, the lower plate 40 moves into the lower casting frame 17 by moving upward relative to the lower casting frame 17 that moves upward. The lower plate 40 moves out of the lower casting frame 17 by moving downward relative to the lower casting frame 17.

[Molding space and squeeze]
A molding space for the upper mold (upper molding space) is formed by the upper plate 25, the upper casting frame 15, and the match plate 19. A molding space for the lower mold (lower molding space) is formed by the lower plate 40, the lower casting frame 17, and the match plate 19. In the upper molding space and the lower molding space, when the upper casting frame cylinder 16, the lower casting frame cylinder 18 and the squeeze cylinder 37 are operated, the upper casting frame 15 and the lower casting frame 17 hold the match plate at a predetermined height. Formed. In the case where the blank frame molding machine 1 includes the lower frame 41, the lower mold space may be formed by the lower plate 40, the lower casting frame 17, the lower frame 41, and the match plate 19.

The upper molding space is filled with mold sand stored in the upper sand tank 22 via the upper plate 25. The lower mold forming space is filled with mold sand stored in the second lower sand tank 31 via the lower plate 40. Compressed air is used for filling. The process of filling the upper molding space and the lower molding space with the molding sand while flowing the molding sand using compressed air is called aeration. FIG. 4 is a schematic diagram of the left side of the frame making machine during the aeration process. As shown in FIG. 4, when the upper casting frame 15 and the lower casting frame 17 hold the match plate 19 at a predetermined height, the molding sand is supplied to the molding space by the compressed air.

The CB of the mold sand filled in the upper molding space and the lower molding space can be set in the range of 30% to 42%. Further, the compressive strength of the mold sand filled in the upper molding space and the lower molding space can be set in the range of 8 N / cm ² to 15 N / cm ² . In addition, since the thickness of the casting mold is changed depending on the model shape or CB (Compactability) of the casting sand, the target height of the second lower sand tank 31 is changed according to the casting thickness. That is, the height of the second connection port 38 of the second 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. Such adjustment can be realized by a control device 50 (FIG. 3) described later.

The squeeze cylinder 37 squeezes the upper plate 25 and the lower plate 40 by moving the second lower sand tank 31 upward in a state where the upper molding space and the lower molding space are filled with mold sand. As a result, pressure is applied to the molding sand in the upper molding space to form the upper casting mold. At the same time, pressure is applied to the molding sand in the lower molding space to form the lower casting mold.

[Mold sand injection chute]
The casting sand injection chute 24 has an upper end opened and a lower end branched into two. A switching damper 43 is provided at the upper end. The switching damper 43 changes the inclination direction so that the mold sand falls on one of the branched lower ends. Further, one lower end portion of the mold sand charging chute 24 is fixed to the upper portion of the upper sand tank 22, and the other lower end portion of the mold sand charging chute 24 is accommodated in the hopper 34 and is not fixed. As described above, since the lower end portion on the first lower sand tank 30 side is not fixed, the lower tank cylinder 32 makes the height of the first connection port 35 of the first lower sand tank 30 independent of the upper sand tank 22. Can be controlled.

[Compressed air supply structure]
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 a compressed air source. “Connected” means that gas is in fluid communication. The supply chamber may be arranged so as to surround the storage chamber. The storage chamber and the supply chamber communicate with each other through a through hole. Compressed air is sent from the compressed air source to the supply chamber, and compressed air is sent from the supply chamber to the storage chamber through the permeable member or the plurality of vent holes.

Hereinafter, the compressed air supply structure in each tank will be described. First, the compressed air supply structure in the upper sand tank 22 will be described. FIG. 5 is a schematic diagram of the left side of the compressed air supply structure for the upper sand tank. FIG. 6 is a schematic diagram of the back side of the compressed air supply structure for the upper sand tank. FIG. 7 is a schematic diagram of the upper surface side of the compressed air supply structure for the upper sand tank.

As shown in FIGS. 5 to 7, the upper sand tank 22 includes, as an example, a first supply chamber S4 located on the upper end side with respect to the center of the upper sand tank 22 and a lower end with respect to the center of the upper sand tank 22. It has 2nd supply chamber S5 located in the side. The center of the upper sand tank 22 is the center of the upper sand tank 22 in the axial direction. The first supply chamber S4 and the second supply chamber S5 are provided on the side of the storage chamber S1. The first supply chamber S4 and the second supply chamber S5 are spaces provided so as to surround the storage chamber S1. The first supply chamber S4 is defined between the side wall 22b of the storage chamber S1 and a piping member 22c provided outside the side wall 22b of the storage chamber S1. The second supply chamber S5 is defined between the side wall 22b of the storage chamber S1 and a piping member 22d provided outside the side wall 22b of the storage chamber S1.

Pipes

80 and 83 are connected to the first supply chamber S4. The

pipes

80 and 83 are connected to positions facing each other of the pipe member 22c. The

pipes

80 and 83 are connected to a main pipe 100 connected to a compressed air source. The piping 80 is provided with an electropneumatic proportional valve 90. The pipe 83 is provided with an electropneumatic proportional valve 93. The electropneumatic

proportional valves

90 and 93 are arranged on the side of the upper sand tank 22. The electropneumatic proportional valve is connected to a control device 50 described later, and is a valve that opens and closes based on a control signal from the control device 50. The first supply chamber S4 communicates with the storage chamber S1 through a through hole (not shown). When the electropneumatic

proportional valves

90 and 93 are opened, the compressed air flows from the main pipe 100 through the

pipes

80 and 83 and is supplied to the first supply chamber S4. Then, the compressed air is sent from the first supply chamber S4 to the storage chamber S1 through the through hole and the first transmission member 22a. 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 so as to surround the storage chamber S1. In this case, the compressed air can be uniformly fed from the circumferential direction toward the storage chamber S1.

Pipes

81 and 82 are connected to the second supply chamber S5. The

pipes

81 and 82 are connected to one side surface of the pipe member 22d. The

pipes

81 and 82 are connected to a main pipe 100 connected to a compressed air source. The pipe 81 is provided with an electropneumatic proportional valve 91. The pipe 82 is provided with an electropneumatic proportional valve 92. The electropneumatic

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 electropneumatic

proportional valves

91 and 92 are opened, the compressed air flows from the main pipe 100 through the

pipes

81 and 82 and is supplied to the second supply chamber S5. Then, the compressed air is sent from the second supply chamber S5 to the storage chamber S1 through the through hole and the first transmission member 22a. 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 so as to surround the storage chamber S1. In this case, the compressed air can be uniformly fed from the circumferential direction toward the storage chamber S1.

Next, the compressed air supply structure in the first lower sand tank 30 and the second lower sand tank 31 will be described. FIG. 8 is a schematic diagram of the left side of the compressed air supply structure relating to the first lower sand tank and the second lower sand tank. FIG. 9 is a schematic diagram of the back side of the compressed air supply structure relating to the first lower sand tank and the second lower sand tank. FIG. 10 is a partially enlarged view of the lower part of the apparatus of FIG.

As shown in FIGS. 8 to 10, the first lower sand tank 30 is, as an example, a third supply chamber S6 located at the center of the first lower sand tank 30, and the upper end side from the center of the first lower sand tank 30. And a fifth supply chamber S8 located on the lower end side of the center of the first lower sand tank 30. The center of the first lower sand tank 30 is the center of the first lower sand tank 30 in the axial direction. 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 bent lower end of the first lower sand tank 30.

The third supply chamber S6 and the fourth supply chamber S7 are spaces provided so as to surround the storage chamber S2. The third supply chamber S6 is defined between the side wall 30c of the storage chamber S2 and a piping member 30d provided outside the side wall 30c of the storage chamber S2. The fourth supply chamber S7 is defined between the side wall 30c of the storage chamber S2 and a piping member 30g provided outside the side wall 30c of the storage chamber S2.

A pipe 84a is connected to the third supply chamber S6. The pipe 84a is connected to one side surface of the pipe member 30d. The pipe 84a is connected to the main pipe 100 connected to the compressed air source via the pipe 84. The pipe 84 is provided with an electropneumatic proportional valve 94. The electropneumatic 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 electropneumatic proportional valve 94 is opened, the compressed air flows from the main pipe 100 through the

pipes

84 and 84a and is supplied to the third supply chamber S6. Then, the compressed air is sent from the third supply chamber S6 to the storage chamber S2 through the through hole and the second transmission member 30a. 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, the compressed air can be uniformly fed from the circumferential direction toward the storage chamber S2.

A pipe 84b is connected to the fourth 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 via the pipe 84. The pipe 84 is provided with an electropneumatic proportional valve 94. That is, the electropneumatic proportional valve 94 controls the flow rates of both the

pipes

84a and 84b. The electropneumatic 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 electropneumatic proportional valve 94 is opened, the compressed air flows from the main pipe 100 through the

pipes

84 and 84b and is supplied to the fourth supply chamber S7. Then, the compressed air is sent from the fourth supply chamber S7 to the storage chamber S2 through the through hole and the second transmission member 30a. 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, the compressed air can be uniformly fed 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 during maintenance of the first lower sand tank 30. FIG. 11 is a cross-sectional view of the inspection door. As shown in FIG. 11, the inspection door 70 is a hollow member, and a fifth supply chamber S8 is defined therein. A supply port 70 b connected to a pipe 85 that supplies compressed air is formed on the outer surface 70 a of the inspection door 70. 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. A vent hole 70e in which a slit is formed is fitted in the through hole 70d.

As shown in FIGS. 8 to 10, a pipe 85 is connected to the fifth 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 piping 85 is provided with an electropneumatic proportional valve 95. The electropneumatic 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 a plurality of vent holes 70e. When the electropneumatic proportional valve 95 is opened, the compressed air flows from the main pipe 100 through the pipe 85 and is supplied to the fifth supply chamber S8. Then, the compressed air is sent from the fifth supply chamber S8 to the storage chamber S2 through the plurality of vent holes 70e.

The second transmission member 30a is not interposed in the flow path sent from the fifth supply chamber S8 to the storage chamber S2. In the bent lower end portion of the first lower sand tank 30, the wear of the transmission member arranged in the storage chamber S2 tends to be larger than other arrangement positions because of the shape thereof. For this reason, in the storage chamber S2 at the bent lower end of the first lower sand tank 30, a plurality of vent holes 70e are used instead of the second transmission member 30a. Thereby, generation | occurrence | production of the clogging of a permeation | transmission member is avoided in the bent lower end part of the 1st lower sand tank 30. FIG.

As an example, the second lower sand tank 31 has a sixth supply chamber S9 and a seventh supply chamber S10 located at the bottom of the storage chamber S3. The sixth supply chamber S <b> 9 is defined inside the piping member 71. The piping member 71 is disposed at the bottom near the second connection port 38 of the second lower sand tank 31. The piping member 71 is provided with a supply port 71a connected to a piping for supplying compressed air, and a 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. A vent hole (not shown) in which a slit is formed is fitted in the through hole 71b. The piping member 72 is provided with a supply port 72a connected to a piping for supplying compressed air, and a 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. A vent hole (not shown) in which a slit is formed is fitted in the through hole 72b.

A pipe 86 is connected to the sixth 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. An electro-pneumatic proportional valve 96 is provided in the pipe 86. The sixth supply chamber S9 communicates with the storage chamber S3 through a plurality of vent holes. When the electropneumatic proportional valve 96 is opened, the compressed air flows from the main pipe 100 through the pipe 86 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 a plurality of vent holes.

A 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. The piping 87 is provided with an electropneumatic proportional valve 97. The seventh supply chamber S10 communicates with the storage chamber S3 through a plurality of vent holes. When the electropneumatic proportional valve 97 is opened, the compressed air flows from the main pipe 100 through the pipe 87 and is supplied to the seventh supply chamber S10. Then, the compressed air is sent from the seventh supply chamber S10 to the storage chamber S3 through a plurality of vent holes.

The transmission 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. In the second lower sand tank 31, the wear of the transmission member arranged in the storage chamber tends to be larger than that of other tanks. For this reason, in the storage chamber S3 of the second lower sand tank 31, a plurality of vent holes are used instead of the transmission member. Thereby, in the 2nd lower sand tank 31, generation | occurrence | production of the clogging of a permeation | transmission member is avoided.

[Pressure detector]
The frame making machine 1 may include 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. As an example, the pressure detector includes a main body, a diaphragm that is accommodated in the main body and deforms due to pressure, and a strain gauge that outputs a signal corresponding to the deformation of the diaphragm. The pressure detector may include a display (for example, an LED (Light Emitting Diode) display) in the main body. Various methods can be adopted as a method of attaching the pressure detector. For example, you may attach to the side wall of a storage chamber, and you may attach to the side wall of the space connected to the storage chamber.

Hereinafter, the arrangement of the pressure detectors in each tank will be described. First, the arrangement of the pressure detectors 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 in the first supply chamber S4. The second pressure detector 62 detects the pressure in the second supply chamber S5. Thus, in the upper sand tank 22, the pressure in the space outside the storage chamber S1 (the first supply chamber S4 and the second supply chamber S5) communicating with the storage chamber S1 via the first transmission member 22a is detected. The

Next, the arrangement of the pressure detectors 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 pressures in the third supply chamber S6 and the fourth supply chamber S7. The fourth pressure detector 64 detects the pressure in the storage chamber S2. The fifth pressure detector 65 detects the pressure in the fifth supply chamber S8. In this way, in the first lower sand tank 30, the pressure outside the storage chamber S2 that directly detects the pressure of the storage chamber S2 and communicates with the storage chamber S2 via the second transmission member 30a (third supply). The pressure in the chamber S6, the fourth supply chamber S7, the fifth supply chamber S8) is detected. Note that the pressure in the storage chamber S2 detected by the fourth pressure detector 64 is used as a reference pressure for preventing backflow during exhaust, which will be described later.

Next, the arrangement of the pressure detectors 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. The sixth pressure detector 66 may detect the pressure in the space outside the storage chamber S3 that communicates with the storage chamber S3 via a vent or the like.

[Details of pressure detector installation]
The arrangement of pressure detectors (first pressure detector 61 to third pressure detector 63, fifth pressure detector 65) for detecting the pressure in the space outside the storage chamber will be described. Since these pressure detectors have the same connection form, the third pressure detector 63 will be described as a representative. FIG. 12 is an example of connection of the third pressure detector. As shown in FIG. 12, a second transmission member 30a is attached to the inside of the side wall 30c of the first lower sand tank 30 via a rubber member 30f. A through hole 30e is formed in the side wall 30c. A piping member 30d that defines the third supply chamber S6 is attached to the outside of the side wall 30c at a 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. The third supply chamber S6 is provided with a connection port (not shown) through which compressed air is supplied. The compressed air supplied from the connection port passes through the through hole 30e and the second transmission member 30a, and is supplied to the inside of the storage chamber S2 of the first lower sand tank 30. Thus, the first pressure detector 61 to the third pressure detector 63 and the fifth pressure detector 65 detect the pressure in the space outside the storage chamber that communicates with the storage chamber via the transmission member.

[Control device]
The frame making machine 1 may include a control device 50 (an example of a control unit). The control device 50 is a computer including a control unit such as a processor, a storage unit such as a memory, an input / output unit such as an input device and a display device, a communication unit such as a network card, and the like. Control mold sand supply system, compressed air supply system, drive system and power supply system. In this control device 50, an operator can perform an input operation of a command to manage the frame making machine 1 by using an input device, and the operation status of the frame making machine 1 can be controlled by a display device. It can be visualized and displayed. Further, in the storage unit of the control device 50, a control program for controlling various processes executed by the frame making machine 1 by the processor and each component of the frame forming machine 1 according to molding conditions are processed. Stores a program to be executed.

The control device 50 is connected to the first pressure detector 61 to the sixth pressure detector 66 and acquires the detection result of at least one pressure detector. Control based on the pressure detection result will be described later.

[Molding process]
The molding process according to this embodiment will be outlined. FIG. 13 is a flowchart for explaining a molding process of the frame making machine according to the embodiment. The molding process shown in FIG. 13 is a process for molding a pair of upper mold and lower mold. The molding process shown in FIG. 13 is automatically started on the condition that the posture of the frame making machine 1 is the original position (initial position). If the frame making machine 1 is not in the original position, it is manually moved to the original position. When the automatic start button is pressed in the posture (original position) of the frame making machine 1 shown in FIG. 3, the molding process shown in FIG. 13 is started.

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

Next, frame setting processing (S14) is performed. In the frame setting process, the upper casting frame cylinder 16, the lower casting frame cylinder 18 (FIG. 2), the lower filling frame cylinder 42, and the squeeze cylinder 37 expand and contract according to the thickness of the mold to be formed. As a result, the upper casting frame 15 moves to a predetermined position, the lower casting frame 17 comes into contact with the match plate 19, and then the lower casting frame 17 on which the match plate 19 is placed moves to a predetermined position. The match plate 19 is sandwiched between the frame 15 and the lower casting frame 17. Then, the second lower sand tank 31 and the lower frame 41 are raised, and the lower frame 41 comes into contact with the lower casting frame 17. Further, the lower tank cylinder 32 expands and contracts, and the first lower sand tank 30 is moved in the vertical direction, so that the height of the first connection port 35 of the first lower sand tank 30 is the second of the second lower sand tank 31. The state coincides with the height of the connection port 38. At this time, the upper molding space and the lower molding space are in a state (height) determined by the control device 50.

Next, an aeration process (S16) is performed. As shown in FIG. 4, in the aeration process, the sealing mechanism seals the first connection port 35 of the first lower sand tank 30 and the second connection port 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 sand tank 22 and the first lower sand tank are driven by the compressed air source and the electropneumatic proportional valves 90 to 97. Compressed air is supplied into 30 and the second lower sand tank 31. As a result, the mold sand is filled into the upper molding space and the lower molding space while flowing the molding sand. As an example, when the set pressure and time are satisfied, the aeration process ends. After the aeration process is completed, the exhaust process in the upper sand tank 22, the first lower sand tank 30, and the second lower sand tank 31 is performed.

Next, a squeeze process (S18) is performed. In the squeeze process, the sealing mechanism operated in the aeration process (S16) releases the seal, and the squeeze cylinder 37 further expands, whereby the second lower sand tank 31 is further raised. As a result, the lower plate 40 attached to the second lower sand tank 31 enters the lower filling frame 41, compresses the molding sand in the lower molding space, and the upper plate 25 enters the upper casting frame 15. Compress the molding sand in the upper molding space. When the squeeze cylinder 37 is controlled by the hydraulic circuit, for example, when it can be determined that the hydraulic pressure of the hydraulic circuit is equal to the set hydraulic pressure, the squeeze process is terminated. In addition, when the squeeze process is being performed and the upper casting frame cylinder 16, the lower casting frame cylinder 18, and the lower filling frame cylinder 42 are controlled by a hydraulic circuit, each cylinder is set to a free circuit. As a result, each cylinder contracts against the squeeze force.

Next, a die cutting process (S20) is performed. In the punching process, the lower frame cylinder 42 contracts to lower the lower frame 41. Thereafter, the squeeze cylinder 37 contracts, the second lower sand tank 31 is lowered, and subsequently, the lower casting frame 17 on which the match plate 19 and the transport plate 20 are placed is lowered. Then, the model is removed from the upper casting frame 15. When the lower casting frame 17 is lowered to a fixed portion (not shown), the match plate 19 and the transport plate 20 are supported by the fixed portion. Thereby, the model is removed from the lower casting frame 17.

Next, a shuttle-out process (S22) is performed. In the shuttle-out process, the transport plate 21 is moved to the retracted position when the transport cylinder 21 contracts. If necessary, the core is arranged on the upper casting frame 15 or the lower casting frame 17.

Next, a frame alignment process (S24) is performed. In the frame alignment process, the lower casting frame cylinder 18 contracts and the squeeze cylinder 37 extends to raise the lower casting frame 17 and the second lower sand tank 31 to align the frames.

Next, a blanking process (S26) is performed. In the blanking process, the upper casting frame cylinder 16 and the lower casting frame cylinder 18 are contracted to raise the upper casting frame 15 and the lower casting frame 17 to the rising end, thereby performing the blanking.

Next, the first frame separation process (S28) is performed. In the first frame separation process, the squeeze cylinder 37 contracts with the mold placed on the lower plate 40 of the second lower sand tank 31, and the second lower sand tank 31 is lowered. At this time, the lower casting frame cylinder 18 extends to lower the lower casting frame 17 and stop at a position that does not interfere when the mold is carried out.

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

Next, the second frame separation process (S32) is performed. In the second frame separation process, the lower casting frame cylinder 18 extends to return the lower casting frame 17 to the original position.

This completes the process of forming a pair of upper mold and lower mold.

[Pressure detection in sand tank]
FIG. 14 is a functional block diagram of a frame making machine according to an embodiment. As shown in FIG. 14, the frame making machine 1 includes a first pressure detector 61 to a sixth pressure detector 66, a control device 50, a display unit 67, and electropneumatic proportional valves 90 to 97.

The control device 50 is connected to the first pressure detector 61 to the sixth pressure detector 66 and can acquire the detection result. The detection result is information on the pressure output from at least one of 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 calculation unit 51 is a component that performs various calculations related to pressure control, and is realized by a processor, a memory, and the like. The communication unit 52 is a component that transmits information to the outside 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 calculation unit 51 and outputs the processed 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 that can display information in a visible state. The display unit 67 is a display device as an example. The display unit 67 may be fixed to the device or may be separate from the device. The display unit 67 displays the detection result of 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 a control signal from the control device 50. The display unit 67 may be configured by a touch panel that accepts an input operation by an operator. The display unit 67 may output an input operation by an operator to the control device 50.

Hereinafter, the control processing of the control device 50 will be described in association with each component.
[First data display processing]
The first data display process is a process for causing the display unit 67 to display the results detected by the first pressure detector 61 to the sixth pressure detector 66 during the execution of the molding process of FIG. The display timing may be during the molding process or after the molding process. The calculation unit 51 of the control device 50 causes the display unit 67 to display a graph showing the relationship between pressure and time as the detection results of the first pressure detector 61 to the sixth pressure detector 66. The calculation unit 51 may cause the display unit 67 to display control information of the electropneumatic proportional valves 90 to 97 according to the detection result. The control information is information related to the control signal of the electropneumatic proportional valve. For example, the control signal of the electropneumatic proportional valve is a signal obtained by converting the control signal into pressure based on a predetermined calculation formula. Such conversion is executed by the calculation unit 51. The calculation unit 51 of the control device 50 causes the display unit 67 to display the control information and the detection result in a manner that allows comparison. For example, the calculation unit 51 of the control device 50 displays the control information and the detection result on the screen at the same timing. As an example, the calculation unit 51 displays the target data to be compared on the same graph. The calculation unit 51 may display the target data to be compared side by side as individual graphs in the same screen. In addition, the aspect which can be compared is not limited to when the object data to be compared is displayed on the screen at the same timing, and the object data to be compared may be alternately displayed on the screen.

FIG. 15 is an example of a graph showing the control signal of the electropneumatic proportional valve and the detection result of the pressure detector. The graph shown in FIG. 15 is a detection result in the upper sand tank 22, the horizontal axis is time, and the vertical axis is pressure. In FIG. 15, the control signal of the electropneumatic proportional valve is converted into pressure and is indicated by a broken line. That is, the broken line in the figure is the target pressure. The time from the rise to the fall of the dashed waveform is the aeration time T1. In FIG. 15, the detection result is shown by a 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. An operator or the like can confirm the validity of the control based on the graph shown in FIG.

As an example, in the graph shown in FIG. 15, the pressure in the upper sand tank 22 increases at the initial stage of the aeration time T1. As shown by the timing E1 in the figure, the pressure increase is temporarily terminated. The end of the increase in pressure is considered to have occurred because the mold sand in the upper sand tank 22 is flowing. Thereafter, as indicated by the timing E2 in the figure, the pressure starts to rise again. It is considered that the re-rise in pressure occurs because the filling of the mold sand is completed. Then, when time elapses from the timing E2, the pressure slightly increases and becomes a constant value. An operator or the like can verify the length of the aeration time T1 based on the graph shown in FIG. An operator or the like can set the length of the aeration time T1 on a setting screen described later. For example, an operator or the like may adjust the aeration time T1 so that the end timing of the aeration time T1 approaches the timing E2. An operator or the like may adjust the aeration time T1 so that the end timing of the aeration time T1 approaches the timing when the margin time T2 has elapsed from the timing E2. The 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 results detected by the first pressure detector 61 to the sixth pressure detector 66. The display timing is when checking for clogging of the first transmission member 22a or the second transmission member 30a, for example, during maintenance. For example, the calculation unit 51 of the control device 50 displays a graph showing the relationship between pressure and time on the display unit 67 as a detection result of at least one of the first pressure detector 61 to the third pressure detector 63. Let Since the first pressure detector 61 to the third pressure detector 63 communicate with the storage chamber via the first transmission member 22a or the second transmission member 30a, the first pressure detector 61 to the third pressure detector. The clogging of the first transmission member 22a or the second transmission member 30a can be detected based on the 63 pressure detection result.

The clogging of the transparent member is judged by the operator. A threshold value may be displayed together with the pressure detection result in order to help a worker or the like. For example, the calculation unit 51 of the control device 50 compares the detection result of at least one pressure detector (the first pressure detector 61 and the second pressure detector 62) of the upper sand tank 22 with a preset threshold value. It is displayed on the display unit 67 in a possible manner. Alternatively, the calculation unit 51 may cause the display unit 67 to display the pressure detected by the third pressure detector 63 of the first lower sand tank 30 and a preset threshold value in a comparable manner. The preset threshold value 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 the threshold value and stored in the storage unit 53. The control device 50 may acquire a threshold value via a touch panel or the like and store it in the storage unit 53. The calculation unit 51 may cause the display unit 67 to display control information of the electropneumatic proportional valves 90 to 94 in accordance with the detection result. The control information is information related to the control signal of the electropneumatic proportional valve. For example, the control signal of the electropneumatic proportional valve is a signal obtained by converting the control signal into pressure based on a predetermined calculation formula. Such conversion is executed by the calculation unit 51.

FIG. 16 is an example of a graph showing the detection result of the pressure detector and the threshold value. The graph shown in FIG. 16 is a detection result in the upper sand tank 22, the horizontal axis is time, and the vertical axis is pressure. In FIG. 16, a thick solid line is an abnormal value, a broken line is a threshold value, and a thin solid line is a detection result of the pressure detector. When clogging occurs in the first transmission member 22a, the pressure rises and exceeds the threshold value. An operator or the like can confirm whether the transmission member is clogged based on the graph shown in FIG.

[Third data display processing]
The third data display process is a process for causing the display unit 67 to display the results detected by the first pressure detector 61 to the sixth pressure detector 66 during the molding process shown in FIG. The display timing may be during the molding process or after the molding process. The calculation unit 51 of the control device 50 causes the display unit 67 to display a graph showing the relationship between pressure and time as the detection results of the first pressure detector 61 to the sixth pressure detector 66. The calculation unit 51 may cause the display unit 67 to display control information of the electropneumatic proportional valves 90 to 97 according to the detection result. The control information is information related to the control signal of the electropneumatic proportional valve. For example, the control signal of the electropneumatic proportional valve is a signal obtained by converting the control signal into pressure based on a predetermined calculation formula. Such conversion is executed by the calculation unit 51.

The calculation unit 51 of the control device 50 stores the detection results of the first pressure detector 61 to the sixth pressure detector 66 in the storage unit 53 at a predetermined timing. And the calculating part 51 displays the memorize | stored detection result and this detection result on the display part 67 in the aspect which can be compared. For example, the computing unit 51 refers to the storage unit 53 and acquires the detection results stored in advance, and acquires the current detection results from the first pressure detector 61 to the sixth pressure detector 66. Then, the calculation unit 51 displays the detection result stored in advance and the current detection result on the screen at the same timing. As an example, the calculation unit 51 displays the target data to be compared on the same graph. The calculation unit 51 may display the target data to be compared side by side as individual graphs in the same screen. In addition, the aspect which can be compared is not limited to when the object data to be compared is displayed on the screen at the same timing, and the object data to be compared may be alternately displayed on the screen.

FIG. 17 is an example in which the detection result stored in advance and the current detection result are compared. The graph shown in FIG. 17 is the detection result in the upper sand tank 22, the horizontal axis is time, and the vertical axis is pressure. The screen example (A) is a screen displaying a graph G1 of detection results stored in advance. The screen example (B) is a screen in which a detection result graph G1 stored in advance and a current detection result graph G2 are displayed in an overlapping manner. An operator or the like can confirm whether there is a difference from the previous process based on the graph shown in FIG.

[Setting screen display processing]
The calculation unit 51 displays a setting screen on the display unit 67 as an example of the setting process. 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 calculation unit 51 sets aeration time, pressure, threshold value, and the like. The setting is, for example, stored in the storage unit 53 as a target value.

FIG. 18 is a screen example displayed by the display unit. Screen example (A) is an example of a setting screen for setting the aeration time. In the upper part of the screen example (A), an icon IC1 for receiving an input operation for changing a page is displayed. In the lower part of the screen, an icon IC2 for receiving an input operation for calling an application or various functions is displayed. In the center of the screen, setting objects and setting items are displayed. An example of the setting target is an electropneumatic proportional valve. In the screen example (A), the electropneumatic

proportional valves

90 and 93 and the electropneumatic

proportional valves

90 and 93 are displayed as objects OB1 and OB2. An example of setting items is aeration time and pressure. In the screen example (A), the aeration time and pressure are displayed as objects OB3 to OB5. Objects OB3 to OB5 are items that can be input by an operator or the like.

Also, examples of setting items are aeration time and pressure during additional processing. The additional process is not executed when the aeration process is normal. The additional process is a process that is executed to extend the aeration time before it is determined that the aeration process is abnormal. Details of the addition process will be described later. In the screen example (A), the aeration time and the pressure during the additional processing are displayed as an object OB6. The object OB6 is an item that can be input by an operator or the like. The setting items accepted in the object OB6 are set values for additional aeration. An operator or the like can make settings related to aeration by inputting values into the objects OB3 to OB6.

[Alarm processing]
The control device 50 issues an alarm when an abnormality is detected. An alarm means notifying an operator or the like of an abnormality. The control device 50 displays a screen related to an alarm on the display unit 67 as an example of alarm processing. The control device 50 may output an alarm from a speaker (not shown) instead of the alarm by display or together with the alarm by display.

One of the abnormalities expected in the frame making machine using compressed air is a blowout abnormality. The blow-out abnormality is “a phenomenon in which a portion where mold sand does not exist due to partial clogging of each supply port of the lower plate 40 occurs and the portion becomes a passage for compressed air”. Since there is little air resistance in the place where the mold sand does not exist, the compressed air blows through only the place. For this reason, when a blow-through abnormality occurs, the pressure does not increase. The control device 50 extends the aeration time when it is determined that the casting sand is not normally filled during the aeration process (additional process). That is, the control device 50 outputs a control signal to at least one electropneumatic proportional valve based on the detection results of the first pressure detector 61 to the sixth pressure detector 66. As a more specific example, the control device 50 can perform normal filling of the mold sand when the maximum pressure detected by the pressure detector within the aeration time T1 does not reach a predetermined threshold during the aeration process. Judge that it is not. The predetermined threshold is stored in the storage unit 53, for example. And the control apparatus 50 outputs a control signal to an electropneumatic proportional valve based on the value set using the screen example (A) of FIG. 18, for example (addition process which extends aeration time).

When the blow-through abnormality is eliminated by the additional process, that is, when the maximum pressure detected by the pressure detector reaches the predetermined threshold value within the additional aeration time, the control device 50 performs the mold sand filling process normally. It is determined that there is, and no alarm is given. On the other hand, the control device 50 outputs alarm information when the maximum pressure detected by the pressure detector within the additional aeration time does not reach a predetermined threshold value. The alarm information is data relating to an alarm, and is screen data when output to the display unit 67, or alarm data when output to a speaker or the like. The control device 50 may stop the operation of the frame making machine 1 together with the output of the alarm information. The screen example (B) in FIG. 18 is an example of an alarm. The control device 50 causes the display unit 67 to display the content of the abnormality, the operating state of the frame making machine 1, the treatment (coping method), the return (return method), and the like.

The control device 50 performs exhaust processing when the aeration time T1 ends. In the exhaust process, 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) in FIG. 17, the decrease in pressure becomes dull at the exhaust processing time T3. When the control device 50 evacuates 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 threshold value after a predetermined time has elapsed. If it is not below, alarm information is output. Thereby, an operator or the like can recognize an abnormality in exhaust.

The control device 50 may output a control signal so that at least one electropneumatic proportional valve is opened based on the detection result of the at least one pressure detector during the exhaust process. By operating in this way, the pressure in the supply chamber is increased, so that the backflow of mold sand from the filling chamber to the supply chamber is prevented. The backflow of the mold sand is likely to occur in the place where the vent is arranged, that is, in the supply chambers S8 to S10. At the time of exhaust processing, the control device 50 outputs a control signal so that the electropneumatic proportional valves 95 to 97 are opened based on the pressure detected by the fourth pressure detector 64 serving as a reference at the time of exhaust processing. The control device 50 may open the electropneumatic proportional valves 95 to 97 so that the pressure is higher than the pressure detected by the fourth pressure detector 64 by a predetermined value (feedback processing).

As described above, in the frame making machine 1 according to this embodiment, the pressures of the upper sand tank 22, the first lower sand tank 30, and the second lower sand tank 31 are detected by the first pressure detector 61 to the sixth pressure detector 66. Is done. Then, the control device 50 acquires the detection results of the first pressure detector 61 to the sixth pressure detector 66. Thus, according to the frame making machine 1, since the situation in the sand tank is grasped by acquiring the pressure in the tank, an excellent mold and cast product can be obtained as a result.

According to the frame making machine 1, when the squeeze process is performed by moving the second lower sand tank in the vertical direction, the situation in the sand tank can be properly grasped.

According to the frame making machine 1, the supply chambers S4 to S10 for supplying compressed air can be used for the arrangement of the first pressure detector 61 to the sixth pressure detector 66. Further, the frame making machine 1 does not need to provide a through hole for pressure detection in the storage chambers S1 to S3 for storing the mold sand. For this reason, according to the frame making machine 1, the influence of the arrangement of the first pressure detector 61 to the sixth pressure detector 66 on the molding process can be reduced.

According to the punch frame molding machine 1, since the upper and lower pressures of the upper sand tank 22, that is, the entire pressure of the upper sand tank 22, are detected, it is possible to grasp the pressure deviation depending on the detection position of the upper sand tank 22. it can. According to the frame making machine 1, since the upper and lower pressures of the first lower sand tank 30, that is, the entire pressure of the first lower sand tank 30 is detected, the pressure depending on the detection position of the first lower sand tank 30. The deviation can be grasped.

According to the frame making machine 1, clogging of the first transmission member 22a and the second transmission member 30a can be detected. Further, in the frame making machine 1, a plurality of vent holes are used instead of the transmitting member in the storage chamber S2 at the bent lower end of the first lower sand tank 30 or in the second lower sand tank 31. For this reason, according to the frame making machine 1, it is possible to avoid the occurrence of clogging of the transmission member at a location where the clogging of the transmission member is likely to occur.

According to the frame making machine 1, the detection results of the first pressure detector 61 to the sixth pressure detector 66 can be notified to the operator. According to the punch frame molding machine 1, it is possible to notify the operator of the time dependency of the pressure. According to the frame making machine 1, the setting operation by the operator can be supported by displaying the setting screen on the display unit 67. Moreover, according to the frame making machine 1, the operator can be notified of the difference between the detection result stored in advance and the current detection result. According to the frame making machine 1, the detection results of the first pressure detector 61 to the sixth pressure detector 66 can be transmitted to an external computer or the like without using a physical storage medium.

According to the frame making machine 1, the detection result of the pressure detector and a preset threshold value can be displayed on the display unit in a manner that can be compared. In this case, the operator can predict clogging of the first transmission member 22a or the second transmission member 30a.

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

According to the frame making machine 1, it is possible to warn the operator that there is a problem with the exhaust system. According to the punch frame molding machine 1, since the electropneumatic proportional valves 90 to 97 are arranged on the side of the sand tank, it is possible to improve the responsiveness of the supply of compressed air.

According to the frame making machine 1, additional aeration can be automatically performed when the maximum pressure does not reach a predetermined threshold value. Furthermore, according to the frame making machine 1, an operator can be warned when the situation is not improved by additional aeration.

The embodiment described above shows an example of a frame making machine according to the present disclosure. The frame making machine 1 according to the present disclosure is not limited to the frame making machine 1 according to the embodiment, and the frame forming machine 1 according to the embodiment is modified without changing the gist described in each claim. Or may be applied to other things.

For example, in the above-described embodiment, the example in which the upper sand tank 22 is fixed to the upper frame 10 has been described, but the upper sand tank 22 may be configured to be movable. Moreover, the sand tank of a molding machine does not need to be three, and may be one and may be two, or four or more.

DESCRIPTION OF SYMBOLS 1 ... Die frame molding machine, 12 ... Guide, 15 ... Upper casting frame, 16 ... Upper casting frame cylinder, 17 ... Lower casting frame, 18 ... Lower casting frame cylinder, 19 ... Match plate, 22 ... Upper sand tank, 25 ... Upper plate, 22a ... first transmission member, 30a ... second transmission member, 30 ... first lower sand tank, 31 ... second lower sand tank, 32 ... lower tank cylinder, 35 ... first connection port, 36 ... first Blocking plate, 37 ... squeeze cylinder, 38 ... second connection port, 39 ... second blocking plate, 40 ... lower plate, 41 ... lower filling frame, 42 ... lower building frame cylinder, 50 ... control device, 51 ... calculation unit, 52 ... Communication unit, 53 ... Storage unit, 61 ... First pressure detector, 62 ... Second pressure detector, 63 ... Third pressure detector, 64 ... Fourth pressure detector, 65 ... Fifth pressure detector, 67 ... display unit, 68 ... communication network, 90-97 ... electro-pneumatic proportional valve.

Claims

A frame making machine for forming an upper mold and a lower mold of a non-cast frame,
Top casting frame,
A lower casting frame that is disposed below the upper casting frame and can hold a match plate together with the upper casting frame;
An upper sand tank that is disposed above the upper casting frame, connected to a compressed air source, its lower end is opened, and mold sand is stored therein,
An upper plate attached to a lower end portion of the upper sand tank, and formed with at least one supply port communicating from the upper sand tank into the upper casting frame;
A first lower sand tank connected to a compressed air source, storing mold sand therein, and having a first connection port for discharging the stored mold sand;
Arranged below the lower casting frame, the upper end thereof is opened, and has a second connection port connectable to the first connection port of the first lower sand tank, and is supplied from the first lower sand tank and A second lower sand tank for storing mold sand supplied into the lower casting frame;
A lower plate attached to an upper end portion of the second lower sand tank and having at least one supply port communicating from the second lower sand tank into the lower casting frame;
At least one pressure detector for detecting the pressure of at least one of the upper sand tank, the first lower sand tank, and the second lower sand tank;
A control unit connected to the pressure detector for obtaining a detection result of the at least one pressure detector;
A frame making machine.
A drive unit that moves the second lower sand tank in a vertical direction to squeeze the upper plate and the lower plate;
An adjustment driving unit for moving the first lower sand tank in the vertical direction;
A frame making machine according to claim 1.
The upper sand tank has a storage chamber for storing the mold sand, and at least one supply chamber provided on a side of the storage chamber and connected to a compressed air source,
The frame making machine according to claim 1 or 2, wherein the at least one pressure detector detects a pressure in the at least one supply chamber of the upper sand tank.
The at least one supply chamber of the upper sand tank includes a first supply chamber located on the upper end side with respect to the center of the upper sand tank, and a second supply chamber located on the lower end side with respect to the center of the upper sand tank. Including
The at least one pressure detector includes a first pressure detector that detects a pressure in the first supply chamber and a second pressure detector that detects a pressure in the second supply chamber. Frame making machine.
The storage chamber of the upper sand tank has a first transmission member having a plurality of holes through which compressed air can flow on the inner surface thereof,
5. The frame making machine according to claim 3, wherein the at least one supply chamber of the upper sand tank communicates with a storage chamber of the upper sand tank via the first permeable member.
The first lower sand tank has a storage chamber for storing the casting sand, and at least one supply chamber provided on a side of the storage chamber and connected to a compressed air source,
The frame making machine according to any one of claims 1 to 5, wherein the at least one pressure detector detects a pressure in the at least one supply chamber of the first lower sand tank.
The at least one supply chamber of the first lower sand tank includes a third supply chamber located in the center of the first lower sand tank and a fourth supply located on the upper end side of the center of the first lower sand tank. 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 that detects a pressure in the third supply chamber, a fourth pressure detector that detects a pressure in the fourth supply chamber, and a pressure in the fifth supply chamber. The frame making machine according to claim 6, further comprising a fifth pressure detector for detecting
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 on the inner surface thereof,
8. The frame making machine according to claim 7, wherein the third supply chamber and the fourth supply chamber communicate with the storage chamber of the first lower sand tank through the second transmission member.
The said 5th supply chamber is provided in the bent lower end part of the said 1st lower sand tank, and is connected with the said storage chamber of the said 1st lower sand tank through several vent holes. Frame making machine.
The second lower sand tank has a storage chamber for storing the casting sand, and at least one supply chamber provided at the bottom of the storage chamber and connected to a compressed air source,
The frame making machine according to any one of claims 1 to 9, wherein the at least one pressure detector detects a pressure in the at least one supply chamber of the second lower sand tank.
The frame making machine according to claim 10, wherein 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 frame making machine according to any one of claims 1 to 11, further comprising a display unit connected to the control unit and displaying a detection result of the at least one pressure detector.
The punching molding machine according to claim 12, wherein the control unit displays a graph indicating a relationship between pressure and time as the detection result on the display unit.
The punching molding machine according to claim 12 or 13, wherein the control unit displays a setting screen for setting an aeration set pressure and time on the display unit.
A storage unit for storing a detection result of the at least one pressure detector;
The control unit according to any one of claims 12 to 14, wherein the control unit causes the display unit to display the detection result stored in the storage unit and the detected current detection result in a comparable manner. Frame making machine.
The frame making machine according to any one of claims 1 to 14, wherein the control unit includes a communication unit that transmits a detection result of the at least one pressure detector via a communication network.
A display unit connected to the control unit and displaying a detection result of the at least one pressure detector;
6. The frame forming die according to claim 5, wherein the control unit causes the display unit to display a detection result of the at least one pressure detector of the upper sand tank and a preset threshold value in a comparable manner. Machine.
A display unit connected to the control unit and displaying a detection result of the at least one pressure detector;
9. The control unit according to claim 8, wherein 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. Unframed molding machine.
Between the upper sand tank, the first lower sand tank and the second lower sand tank, and a compressed air source, at least one control valve that can be opened and closed according to a control signal is provided,
The frame making machine according to any one of claims 1 to 18, wherein 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 control unit opens the at least one control valve 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. The frame making machine according to claim 19, wherein the control signal is output so that
The control unit, when exhausting the upper sand tank, the first lower sand tank, and the second lower sand tank, when the pressure detected by the at least one pressure detector does not become a predetermined threshold value or less. 21. The frame making machine according to claim 19 or 20, which outputs alarm information.
The control valve corresponding to the upper sand tank is disposed on a side of the upper sand tank,
The frame making machine according to any one of claims 19 to 21, wherein the control valve corresponding to the first lower sand tank is disposed on a side of the first lower sand tank.
When the maximum pressure detected by the pressure detector does not reach a predetermined threshold value within a predetermined aeration time during the aeration process, the control unit extends the aeration time, and after extending the at least The frame making machine according to any one of claims 1 to 22, wherein alarm information is output when a maximum pressure detected by one pressure detector does not reach a predetermined threshold value.