TW201741049A - flaskless molding machine capable of using the best mold sand for molding capability to the casting mold and quality of casting product without considering to adjust the compactability - Google Patents

Abstract

The flaskless molding machine of the present invention comprises an upper flask and a lower flask capable of clamping mold plates; an upper sand tank disposed above the upper flask, which has an opening at a lower end part and is stored therein with mold sand; an upper plate installed to the lower end part of the upper sand tank and formed with a supply port, which can move back and forth in the upper flask; a first lower sand tank stored therein with mold sand and having a first connection port for discharging mold sand; a second lower sand tank disposed below the lower flask, which has an opening at the upper end part and a second connection port capable of being connected with the first connection port of the first lower sand tank, and is stored with mold sand; a lower plate installed to the upper end part of the second lower sand tank and formed with a supply port, which can move back and forth in the lower flask; a drive part making the second lower sand tank move in the vertical direction; and an adjustment drive part making the first lower sand tank move in the vertical direction.

Description

Boxless molding machine

The present invention relates to a boxless molding machine.

Patent Document 1 discloses a boxless molding machine for molding a frameless mold without a cast frame. The molding machine comprises: a set of upper casting frame and a lower casting frame, which clamps a model plate provided with a model; a supply mechanism that supplies the molding sand; and a pressing mechanism that compresses the molding sand. The molding machine closes the lower casting frame to the upper casting frame, and clamps the model plate with the above casting frame and the lower casting frame. In this state, the molding machine supplies the molding sand to the molding space formed by the upper casting frame and the lower casting frame by operating the supply mechanism. The molding machine compresses the mold sand of the upper and lower molding spaces by operating the pressing mechanism. After the above steps, the upper mold and the lower mold are simultaneously molded.

The supply mechanism of the molding machine supplies compressed molding sand to the upper and lower molding spaces using compressed air. The supply mechanism has a sand channel connected to the compressed air source and stored on the mold sand, and a nozzle disposed on the upper portion of the upper casting frame and statically connected to the upper sand groove. The compressed air blown from the compressed air source supplies the mold sand stored in the upper sand tank to the upper nozzle, and the mold sand of the upper nozzle is supplied to the mold space supplied by the upper casting frame. Similarly, the supply device has a nozzle that communicates with the compressed air source and stores the mold sand, and a nozzle disposed below the lower casting frame to move up and down and connected to the lower sand channel at a specific position. The compressed air blown from the compressed air source supplies the mold sand stored in the lower sand tank to the lower nozzle, and the mold sand of the lower nozzle is supplied to the lower casting frame.

The extrusion mechanism of the boxless molding machine has an upper and lower opposing extrusion cylinder and a lower extrusion cylinder. The upper extrusion cylinder applies downward pressure to the mold sand of the upper molding space, and the lower extrusion cylinder is placed downward The mold sand of the molding space exerts upward pressure. Thereby, the hardness of the mold sand is increased.

[Advanced technical literature] [license literature]

[Patent Document 1] Japanese Patent Laid-Open No. 54-51930

In the boxless molding machine described in Patent Document 1, since the mold thickness of the mold is changed by the CB (Compactability) of the mold shape or the mold sand, the target height of the lower head varies depending on the thickness of the mold. . Therefore, depending on the situation, the connection port of the lower nozzle and the connection port of the lower sand channel are staggered. In this case, since the flow of the mold sand is different, there is a clogging of the sand in the lower sand tank. Such sand plugging can be avoided by using low CB mold sand. However, there is also a case where the mold sand adjusted to a low CB is not the optimum mold sand for the mold moldability or the quality of the cast product. In the art, a boxless molding machine capable of molding an excellent mold or cast product is desired.

The boxless molding machine of one aspect of the present invention molds the mold without the casting frame and the lower mold, and comprises: an upper casting frame; a lower casting frame, which is disposed below the upper casting frame, And clamping the model plate together with the upper casting frame; the upper sand groove is disposed above the upper casting frame, connected to the compressed air source, the lower end portion is open, and the mold sand is stored therein; the upper plate is mounted on the upper plate a lower portion of the upper sand channel and forming at least one supply port communicating from the upper sand channel into the upper casting frame; the first lower sand channel is connected to the compressed air source, stores the mold sand therein, and has the discharge storage a first connection port of the mold sand; a second lower sand groove disposed below the lower casting frame, the upper end portion being open, and having a second connection port connectable to the first connection port of the first lower sand channel, And storing the mold sand supplied from the first lower sand channel and supplied into the lower casting frame; the lower plate is installed at the upper end portion of the second lower sand groove, and is formed to be connected from the second lower sand groove to the lower casting frame. At least one supply port; a driving portion that moves the second lower sand groove in the vertical direction, and The upper plate and the lower plate are pressed; and the driving portion is adjusted to move the first lower sand groove in the vertical direction.

In the boxless molding machine according to one aspect of the present invention, the sand groove for supplying the mold sand to the lower casting frame is divided into the first lower sand groove and the second lower sand groove, and the second lower sand groove is driven by the driving portion. The vertical movement is moved in the vertical direction, and the first lower sand groove is moved in the vertical direction by adjusting the driving portion. In this manner, since the first lower sand tank and the second lower sand tank can move up and down independently, the first joint port of the first lower sand tank can be adjusted in order to match the height of the second joint port of the second lower sand tank. height. Thereby, the flow of the mold sand in the connection portion between the first connection port and the second connection port is the same, and the occurrence of sand clogging can be suppressed. Therefore, it is possible to adjust the mold sand of the mold sand without considering the clogging of the sand, and it is possible to use the mold sand which is the best for the mold moldability or the quality of the cast product, and as a result, an excellent mold and cast product can be obtained.

In an embodiment, the upper mold plate, the upper casting frame and the model plate may be used to form a molding space on the upper mold, and the mold sand stored in the upper sand groove is filled into the upper mold through the upper plate. The space is formed by the second lower sand groove lower plate, the lower casting frame and the model plate which are moved to the specific height by the driving portion, thereby forming a molding space under the mold under the mold, and the first driving portion is adjusted by the adjusting portion. The height of the first connection port of the sand groove is adjusted to the connection position of the second connection port of the second lower sand channel, and the mold sand stored in the first lower sand groove is supplied to the second lower sand groove, and is stored in the second lower sand tank through the lower plate. (2) The mold sand of the lower sand groove is filled into the lower mold space to fill the mold sand in the upper mold space and the lower mold space, and the second lower sand groove is moved upward by the driving portion, and the upper plate and the lower plate The plate is extruded.

In the case of such a configuration, since the divided lower sand groove can be moved up and down to achieve the filling and pressing of the mold sand of the downward casting frame, the case of using the sand groove for the casting frame under the integrated type is adopted. In comparison, the tilt due to load imbalance can be reduced.

The boxless molding machine of one embodiment includes a lower frame, and the lower molding space may be formed by a lower plate, a lower casting frame, a lower frame, and a model plate. In the case of such a configuration, the stroke of the lower casting frame can be shortened. Therefore, the boxless molding machine can be installed as compared with the case where the underframe is not provided. The lower molding machine can reduce the molding time of a set of upper and lower molds.

In one embodiment, the upper sand channel and the first lower sand channel may be provided with a plurality of holes through which a plurality of holes through which compressed air can flow are disposed. In the case of such a configuration, since the compressed air is supplied from the side to the storage space through the entire surface of the transmission member, the fluidity of the mold sand is improved. In this state, the molding sand is blown into the upper casting frame and the lower casting frame by the compressed air, whereby the blowing resistance of the molding sand can be reduced. Therefore, the power consumption of the compressed air source can be suppressed, and at the same time, the occurrence of sand clogging can be suppressed.

In one embodiment, the inner surface of at least one of the supply ports of the upper plate may be inclined such that the opening of the lower surface of the upper plate is narrower than the opening of the upper surface of the upper plate. In the case of such a configuration, the mold sand existing in the supply port can be fixed by the pressing force to the extent that it is not dropped by gravity after extrusion.

In one embodiment, a protrusion having an inclined surface inclined toward at least one of the supply ports of the upper plate may be provided on the upper surface of the upper plate. In the case of such a configuration, since the mold sand is guided to the supply port by the projections, the mold sand can be prevented from staying in the vicinity of the supply port.

In one embodiment, a nozzle disposed on a lower surface of the upper plate and communicating with at least one supply port may be included. In the case of such a configuration, the supply of the matching model shape can be performed by adjusting the direction of the nozzle.

In one embodiment, at least one of the supply ports of the upper plate may be formed by a plurality of supply ports, and a closing plate covering the supply ports preselected from the plurality of supply ports may be disposed on the lower surface of the upper plate. In the case of this configuration, since the supply port of the mold sand can be selectively supplied by the presence or absence of the closing plate, the supply of the mold shape can be performed.

In one embodiment, the inner surface of at least one of the supply ports of the lower plate may be inclined such that the upper surface opening of the lower plate is narrower than the lower surface opening of the lower plate. In the case of such a configuration, it is possible to prevent the sand from being clogged at the supply port during the next supply of sand.

In one embodiment, the lower surface of the lower plate may be provided with a protrusion having an inclined surface inclined toward at least one of the supply ports of the lower plate. In the case of such a formation, The mold sand is guided to the supply port, so that the mold sand can be prevented from staying near the supply port.

In one embodiment, the nozzle may be disposed on the upper surface of the lower plate and communicated with at least one supply port. In the case of such a configuration, the supply of the matching model shape can be performed by adjusting the direction of the nozzle.

In one embodiment, at least one of the supply ports of the lower plate may be formed by a plurality of supply ports, and a closing plate covering the supply port selected in advance from the plurality of supply ports may be disposed on the upper surface of the lower plate. In the case of this configuration, since the supply port of the mold sand can be selectively supplied by the presence or absence of the closing plate, the supply of the mold shape can be performed.

In one embodiment, the upper casting frame, the lower casting frame, and the second lower sand channel may be movably mounted by four guides. In the case of such a configuration, the movement of the upper casting frame, the lower casting frame, and the second lower sand groove is stabilized. Thereby, the extrusion can be performed stably. Therefore, the performance of mold release and the like can be improved, and as a result, an excellent mold and a cast product can be obtained.

In one embodiment, the first connection port and the second connection port may be connected to each other at a connection surface in the vertical direction, and the first end portion of the first lower sand groove before the first connection port is formed to extend in the vertical direction. The closing plate is provided on the side portion of the second lower sand groove forming the second connection port in the second closing plate extending in the vertical direction. In the case of such a configuration, even when the heights of the first connection port and the second connection port are different, the second connection port can be covered by the first closing plate, and the second closing plate can also be used. Cover the first connector. Therefore, the mold sand can be prevented from flowing out of the sand groove.

According to various aspects and embodiments of the present invention, a boxless molding machine capable of molding a mold or a cast product excellent in mold is provided.

1‧‧‧No box moulding machine

10‧‧‧Upper frame

11‧‧‧ Lower frame

12‧‧‧ Guides

12A‧‧‧Guide

13‧‧‧Support framework

14‧‧‧Support framework

15‧‧‧Upper casting frame

16‧‧‧Upper casting frame cylinder

17‧‧‧ casting frame

18‧‧‧ Lower casting frame cylinder

19‧‧‧Model board

20‧‧‧Transportation board

21‧‧‧Transporting cylinder

22‧‧‧Upper sand tank

22a‧‧‧through components

23‧‧‧Sliding door

24‧‧‧ mold sand into the chute

25‧‧‧Upper board

25a‧‧‧ supply port

25b‧‧‧lower surface

25c‧‧‧ upper surface

25d‧‧‧protrusion

26‧‧‧Pipe

27‧‧‧Electrical air proportional valve

29‧‧‧Pipe

30‧‧‧1st lower sand trap

30a‧‧‧through components

30b‧‧‧Pipe

31‧‧‧2nd lower sand trap

32‧‧‧ lower tank

33‧‧‧Sliding door

34‧‧‧ funnel

35‧‧‧1st connection

35a‧‧‧ openings

36‧‧‧1st closing plate

37‧‧‧Extrusion cylinder

38‧‧‧2nd connection

39‧‧‧2nd closing plate

40‧‧‧ Lower board

40a‧‧‧ supply port

40b‧‧‧ lower surface

40c‧‧‧ upper surface

40d‧‧‧protrusion

41‧‧‧Under frame

42‧‧‧Bottom frame cylinder

43‧‧‧Switching baffle

44‧‧‧Nozzle plate

44a‧‧‧ openings

45‧‧‧Closed board

46‧‧‧Nozzle plate

46a‧‧‧ openings

47‧‧‧Closed board

48‧‧‧Extrusion cylinder

49‧‧‧ bushing

50‧‧‧Control device

51‧‧‧1st detection department

52‧‧‧2nd Inspection Department

53‧‧‧3rd Detection Department

54‧‧‧4th Inspection Department

55‧‧‧5th Detection Department

60‧‧‧ Magnet

61‧‧‧Magnetic field detection department

62‧‧‧ components

63‧‧‧ components

70‧‧‧ Identification Department

71‧‧‧rails

72‧‧‧ Sealing members

73‧‧‧Retaining components

73a‧‧‧ gas inlet

80‧‧‧Control Department

90‧‧‧Memory Department

A1‧‧‧Molding Department

A2‧‧‧Transport Department

S12‧‧‧ Processing

S14‧‧‧ Processing

S16‧‧‧ Processing

S18‧‧‧ Processing

S20‧‧‧ Processing

S22‧‧‧ Processing

S24‧‧‧ Processing

S26‧‧‧ Processing

S28‧‧‧ Processing

S30‧‧‧ Processing

S32‧‧‧ Processing

S40‧‧‧ Processing

S42‧‧‧ Processing

X‧‧‧ direction

Y‧‧‧ direction

Z‧‧‧ direction

Fig. 1 is a perspective view showing the front side of a boxless molding machine according to an embodiment.

Figure 2 is a front elevational view of the boxless molding machine of one embodiment.

Fig. 3 is a schematic view showing the left side of the boxless molding machine of the embodiment.

Fig. 4 is a partial cross-sectional view showing a state in which the first lower sand channel is connected to the second lower sand channel.

Fig. 5 is a plan view showing a state in which the first lower sand channel is connected to the second lower sand channel.

Fig. 6 is a schematic view showing a first connection port of the first lower sand channel;

Figure 7 is a partially enlarged cross-sectional view showing the sealing mechanism.

Figure 8 is a perspective view of the upper surface side of the lower plate.

Figure 9 is a perspective view of the lower surface side of the lower plate.

Figure 10 is a cross-sectional view taken along line X-X of Figure 8.

Figure 11 is a perspective view of the lower surface side of the upper plate.

Figure 12 is a perspective view of the upper surface side of the upper plate.

Figure 13 is a cross-sectional view taken along line XIII-XIII of Figure 11 .

Figure 14 is a schematic view showing the bushing.

Figure 15 is a cross-sectional view of Figure 14.

Figure 16 is a plan view showing the bushing removed.

Figure 17 is a cross-sectional view showing the bushing removed.

Fig. 18 is a flow chart showing the molding process of the boxless molding machine of one embodiment.

Fig. 19 is a schematic view showing the shuttle processing.

Fig. 20 is a schematic diagram for explaining a frame setting process.

Fig. 21 is a schematic view showing the ventilation process.

Fig. 22 is a schematic view showing the extrusion process.

Fig. 23 is a schematic view showing the demolding process.

Fig. 24 is a schematic view showing the shuttle processing.

Fig. 25 is a schematic view showing the framing process.

Fig. 26 is a schematic view showing the frame drawing process.

Fig. 27 is a schematic diagram for explaining the first frame separation processing (first half).

Fig. 28 is a schematic view showing a molding extrusion process.

Fig. 29 is a schematic diagram for explaining the second frame separation processing (second half).

Figure 30 is a functional block diagram of a control device for a boxless molding machine according to an embodiment.

Fig. 31 is a plan view showing an example of the first detector.

Fig. 32 is a front view showing an example of the first detector.

Fig. 33 is a flow chart for explaining the target setting processing of the boxless molding machine of the embodiment.

Hereinafter, an embodiment will be described with reference to additional drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals, and the description thereof will be omitted. Hereinafter, the horizontal direction is the direction of the X-axis and the Y-axis, and the vertical direction (vertical direction) is the direction of the Z-axis.

[Summary of boxless molding machine]

Fig. 1 is a perspective view showing a front side of a boxless molding machine 1 according to an embodiment. The boxless molding machine 1 is a molding machine without a casting mold and a lower molding mold. As shown in Fig. 1, the boxless molding machine 1 includes a mold making portion A1 and a conveying portion A2. The mold making portion A1 is provided with a cast frame and a lower cast frame which are movable in the box shape in the vertical direction (Z-axis direction). The conveyance unit A2 introduces the model plate on which the model is placed into the mold making unit A1. The casting frame and the lower casting frame on the molding portion A1 move in proximity to each other and sandwich the mold plate. Fill the mold sand in the upper casting frame and the lower casting frame. The mold sand filled in the upper casting frame and the lower casting frame is pressed from the upper and lower directions by the pressing mechanism included in the molding portion A1 to simultaneously form the upper mold and the lower mold. Thereafter, the upper mold and the lower mold are pulled out from the upper casting frame and the lower casting frame, respectively, and are carried out to the outside of the apparatus. Thus, the boxless molding machine 1 can mold the mold without the casting frame and the lower mold.

[Frame Structure]

Figure 2 is a front elevational view of the boxless molding machine 1 of one embodiment. Fig. 3 is a schematic view showing the left side of the boxless molding machine 1 of the embodiment. As shown in FIGS. 2 and 3, the boxless molding 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 portion coupled to the upper frame 10 and a lower end portion coupled to the lower frame 11. The frame of the above-described mold forming portion A1 is constituted by the upper frame 10, the lower frame 11, and the four guide members 12.

A support frame 13 (FIG. 2) of the transport unit A2 is disposed on the side of the frame of the mold making portion 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 mold making portion A1 (the positive direction of the Y-axis). The support frame 14 supports the first lower sand tank to be described later.

[Upper casting frame and lower casting frame]

The boxless molding machine 1 includes an upper casting frame 15. The upper casting frame 15 is a box-shaped frame in which the upper end portion and the lower end portion are opened. The upper casting frame 15 is movably mounted to the four guides 12. The upper casting frame 15 is supported by being attached to the casting frame cylinder 16 above the upper frame 10, and moves up and down along the guide 12 in accordance with the movement of the upper casting frame cylinder 16.

The boxless molding machine 1 includes a casting frame 17 disposed below the upper casting frame 15. The lower casting frame 17 is a box-shaped frame in which the upper end portion and the lower end portion are opened. The lower casting frame 17 is movably mounted to the four guides 12. The lower casting frame 17 is supported by the lower casting frame cylinders 18 (Fig. 2) attached to the upper frame 10, and moves up and down along the guides 12 in accordance with the operation of the lower casting frame cylinders 18. Hereinafter, the area surrounded by the guide 12 is also referred to as a mold forming position.

The model plate 19 is introduced between the upper casting frame 15 and the lower casting frame 17 from the conveying portion A2. The model plate 19 is attached to the plate member of the double-sided configuration model, and is advanced 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 guide rail that faces the mold making position, a transport plate 20 with rollers attached to the guide rail, and a transport cylinder 21 that operates the transport plate 20. The model plate 19 is disposed on the conveying plate 20, and is disposed between the lower casting frame 17 which is the molding position, that is, the upper casting frame 15, by the operation of the conveying cylinder 21. The upper casting frame 15 and the lower casting frame 17 are capable of sandwiching the disposed mold plate 19 from the up and down direction. Hereinafter, the area on the support frame 13 is also referred to as a retreat position.

[sand trough]

The boxless molding machine 1 includes a sand groove 22 disposed above the upper casting frame 15. The upper sand channel 22 is mounted to the upper frame 10. More specifically, the upper sand channel 22 is statically fixed to the upper frame 10. The upper sand chute 22 stores therein a mold sand for supply to the upper casting frame 15. Upper sand groove 22 at its upper end The opening and the lower end are open. A sliding door 23 that slides the plate-shaped shielding member in the horizontal direction (positive and negative directions of the X-axis) is provided at an upper end portion of the upper sand groove 22. By the action of the sliding door 23, the upper end portion of the upper sand groove 22 is switchably constructed. Further, above the upper sand chute 22, a mold sand into which the mold sand is placed is fixedly placed in the chute 24. The mold sand input chute 24 will be described later. When the sliding door 23 is in the open state, the mold sand is supplied to the upper sand chute 22 via the mold sand input chute 24.

The lower end of the upper sand groove 22 is open, and the upper plate 25 is attached to the opening of the lower end portion (Fig. 3). The upper plate 25 is a plate-like member and has at least one supply port that communicates from the upper sand casting groove 22 into the upper casting frame 15. The mold sand in the upper sand chute 22 is supplied into the upper casting frame 15 through the supply port of the upper plate 25. The upper plate 25 is substantially the same size as the opening of the upper casting frame 15. The upper plate 25 enters the upper casting frame 15 by the upper casting frame 15 moving in the upper direction. The upper plate 25 is withdrawn from the upper casting frame 15 by the upper casting frame 15 moving in the lower direction. Thus, the upper plate 25 is configured to advance and retreat within the upper casting frame 15. Details of the upper plate 25 will be described below.

The upper sand channel 22 is connected to a source of compressed air (not shown). As a specific example, the upper sand tank 22 is connected to a pipe 26 (FIG. 2) for supplying compressed air to the upper portion thereof, and is connected to a compressed air source via a pipe 26. An electric air proportional valve 27 (Fig. 2) is provided in the pipe 26. The electro-pneumatic proportional valve 27 not only switches the supply and stop of the compressed air, but also automatically adjusts the valve opening according to the pressure on the output side. Therefore, compressed air of a specific pressure is supplied to the upper sand chute 22. When the sliding door 23 is in the closed state, the compressed air supplied from the upper portion of the upper sand chute 22 is fed toward the lower portion of the upper sand chute 22. The mold sand in the upper sand chute 22 is supplied to the upper casting frame 15 through the supply port of the upper plate 25 together with the compressed air.

Further, the upper sand groove 22 is provided on its inner surface with a transmission member 22a (Fig. 3) having a plurality of holes through which compressed air can flow. Thereby, since the compressed air is supplied to the entire internal space via the entire surface of the transmission member 22a, the fluidity of the mold sand is improved. The transmission member 22a may also be formed of a porous material. The upper sand channel 22 is connected at its side to a pipe (not shown) for supplying compressed air, and a pipe 29 for discharging compressed air (Fig. 2). The piping 29 is provided so as not to pass the mold sand. The filter that allows the compressed air to pass through can prevent the mold sand from being discharged to the outside of the sand groove 22.

The boxless molding machine 1 includes a sand tank that stores the mold sand supplied to the lower casting frame 17. As an example, the lower sand channel is divided into a first lower sand channel 30 (FIG. 3) and a second lower sand channel 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 stores therein mold sand for supply to the lower casting frame 17.

The first lower sand channel 30 is supported by the support frame 14 and movably mounted to the guide 12A (FIG. 1) extending downwardly above the support frame 14. More specifically, the first lower sand groove 30 is supported by a groove cylinder (adjustment drive portion) 32 (FIG. 3) attached to the lower frame 10, and moves up and down along the guide 12A in accordance with the action of the lower tank 32. .

The first lower sand groove 30 has an upper end opening. A sliding door 33 (FIG. 3) for sliding the plate-shaped shielding member in the horizontal direction (positive and negative directions of the X-axis) is provided at the upper end portion of the first lower sand groove 30. The upper end portion of the first lower sand groove 30 is configured to be switchable by the operation of the sliding door 33. Further, a funnel 34 (Fig. 3) for inserting mold sand is fixedly disposed above the first lower sand tank 30. The connection relationship between the funnel 34 and the mold sand input chute 24 will be described later. When the sliding door 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 portion of the first lower sand groove 30 is bent in the horizontal direction (the negative direction of the Y-axis), and the first connection port 35 (FIG. 3) for discharging the stored mold sand is formed at the front end portion. The first connection port 35 is configured to be connectable to a second connection port of the second lower sand channel 31 to be described later at a specific height (connection position). The mold sand is supplied to the second lower sand tank 31 via the first connection port 35. Further, a first closing plate 36 extending in the vertical direction is provided at an end portion of the first lower sand groove 30. The second connection port of the second lower sand channel 31, which will be described later, is covered by the first closing plate 36 when it is not at the connection position.

The first lower sand channel 30 is connected to a compressed air source (not shown). As a specific example, the first lower sand tank 30 is connected to a pipe (not shown) for supplying compressed air to the upper portion thereof, and is connected to a compressed air source via a pipe. An electric air proportional valve (not shown) is provided in the piping. Therefore, compressed air of a specific pressure is supplied to the first lower sand tank 30. When the sliding door 33 is in the closed state, when the second connection port of the second lower sand groove 31 to be described later is located at the connection position, the first lower sand groove 30 is used. The upper part supplies compressed air. The compressed air is sent to the first lower sand tank 30, and the mold sand in the first lower sand tank 30 is supplied to the second lower sand tank 31 via the first connection port 35 together with the compressed air.

Further, the first lower sand channel 30 is provided on its inner surface with a transmission member 30a having a plurality of holes through which compressed air can flow. Thereby, since the compressed air is supplied to the entire internal space through the entire surface of the transmission member 30a, the fluidity of the mold sand is improved. The transmission member 30a may also be formed of a porous material. The first lower sand channel 30 is connected at its side to a pipe 30b for discharging compressed air. In the piping 30b (Fig. 3), a filter that passes the compressed air without passing the mold sand is disposed, and the mold sand can be prevented from being discharged to the outside of the first lower sand tank 30.

The second lower sand channel 31 is disposed below the lower casting frame 17 . The second lower sand chute 31 stores therein a mold sand for supplying the lower casting frame 17. The second lower sand channel 31 is movably attached to the four guides 12, and is supported by the extrusion cylinder (drive portion) 37 extending in the vertical direction.

A second connection port 38 (FIG. 3) that can be connected to the first connection port 35 of the first lower sand channel is formed at a side portion of the second lower sand channel 31. The second connection port 38 is configured to be connectable to the first connection port 35 of the first lower sand channel 30 at a specific height (connection position). The connection position is a height at which the first connection port 35 is connected to the second connection port 38. Specifically, the first connection port 35 and the second connection port 38 are disposed coaxially. The first connection port 35 and the second connection port 38 are connected to each other at a connection surface in the vertical direction.

4 is a partial cross-sectional view showing a state in which the first lower sand channel 30 and the second lower sand channel 31 are connected. FIG. 5 is a plan view showing a state in which the first lower sand channel 30 and the second lower sand channel 31 are connected. As shown in FIG. 4 and FIG. 5, the first lower sand channel 30 and the second lower sand channel 31 are connected to each other at a specific connection position by the first connection port 35 and the second connection port 38, and are in a state of being in communication with each other. The mold sand is supplied from the first lower sand tank 38 to the second lower sand tank 31 via the first connection port 35 and the second connection port 38. Further, a second closing plate 39 (FIGS. 3 to 5) extending in the vertical direction is provided in the second connection port 38 of the second lower sand channel 31. The second closing plate 39 is provided on both sides of the first connection port 35 of the first lower sand channel 30. Guide rail 71. The second closing plate 39 is guided by the guide rail 71, whereby the first connection port 35 and the second connection port 38 are guided to the connection position without being inclined to each other. The first connection port 35 of the first lower sand channel 30 is covered by the second closing plate 39 when it is not at the connection position.

Further, the caseless molding machine 1 may include a sealing mechanism that hermetically seals the connection faces of the first connection port 35 and the second connection port 38. For example, the sealing mechanism is provided on the side of the first connection port 35. Fig. 6 is a schematic view showing the first connection port 35 of the first lower sand channel 30, and is a view of the first connection port 35 as seen from the side of the opening. As shown in FIG. 6, the first connection port 35 includes an opening 35a that communicates with the inside of the first lower sand channel 30. The sealing member includes a sealing member 72 and a holding member 73. The sealing member 72 is an annular member that surrounds the opening 35a. The sealing member 72 has a tube shape into which a gas can be introduced, and has flexibility. The holding member 73 surrounds the annular member of the opening 35a and abuts against the second closing plate 39. A groove that can accommodate the sealing member 72 is formed on the surface of the holding member 73 to which the second closing plate 39 abuts. Figure 7 is a partially enlarged cross-sectional view showing the sealing mechanism. As shown in FIG. 7, the sealing member 72 is accommodated so that it does not protrude from the surface of the holding member 73 which the 2nd closing board 39 abuts. A gas introduction port 73a (FIGS. 4 to 7) that communicates with the sealing member 72 is formed in the holding member 73. The sealing member 72 expands when the gas is introduced into the inside thereof, and protrudes from the surface of the holding member 73 to hermetically seal the connection faces of the first connection port 35 and the second connection port 38. Further, the boxless molding machine 1 may employ a sealing mechanism other than the sealing mechanism shown in Figs. 4 to 7 .

The upper end portion of the second lower sand channel 31 is open, and the lower plate 40 is attached to the opening of the upper end portion (Fig. 3). The lower plate 40 is a plate-like member and has at least one supply port that communicates with the inside of the lower casting frame 17 from the second lower sand channel 31. The mold sand in the second lower sand tank 31 is supplied into the lower casting frame 17 through the supply port of the lower plate 40 and the lower frame which will be described later. The details of the lower plate 40 will be described below.

[shelf frame]

As an example, the boxless molding machine 1 includes a lower frame 41. The lower frame 41 is disposed below the lower casting frame 17. The lower frame 41 is a box-shaped frame in which the upper end portion and the lower end portion are opened. Under The opening at the upper end of the 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 channel 31 therein. The lower frame 41 is supported by the frame cylinder 42 fixed to the lower lower groove 31 so as to be movable up and down. The lower plate 40 has substantially the same opening size as the lower frame 41 and the lower casting frame 17. Further, the lower frame 41 can be moved up and down, and the position where the second lower sand groove 31 and the lower plate 40 are accommodated in the inside is the original position (initial position), and becomes the lower end. By moving the lower frame 41 in the upward direction, the lower plate 40 is withdrawn from the lower frame 41. The lower plate 40 enters the lower frame 41 by moving the lower frame 41 in the lower direction by moving in the upper direction. In this way, the lower plate 40 is configured to be movable forward and backward (accessible) in the lower frame 41. Since the boxless molding machine 1 can shorten the stroke of the lower casting frame 17 by including the lower frame 41, it can be used as a boxless molding machine having a lower apparatus height than the case where the lower frame 41 is not included. Further, since the boxless molding machine 1 can shorten the stroke of the lower casting frame 17 by including the lower frame 41, the molding time of one set of the upper mold and the lower mold can be shortened.

In addition, the boxless molding machine 1 may not include the lower frame 41. In this case, the lower plate 40 is configured to be advanced and retractable (accessible) in the lower casting frame 17. The casting frame 17 can be moved up and down, and the lower end is the original position (initial position). That is, the lower plate 40 is moved into the lower casting frame 17 by moving more obliquely in the upper direction than the casting frame 17 moving in the upper direction. The lower plate 40 is withdrawn from the lower casting frame 17 by moving more in the lower direction than the lower casting frame 17.

[modeling space and extrusion]

The molding space (upper molding space) of the upper mold is formed by the upper plate 25, the upper casting frame 15, and the mold plate 19. The molding space (lower molding space) of the lower mold is formed by the lower plate 40, the lower casting frame 17, and the mold plate 19. The upper molding space and the lower molding space are used to move the upper casting frame cylinder 16, the lower casting frame cylinder 18 and the extrusion cylinder 37, and the upper casting frame 15 and the lower casting frame 17 hold the model plate at a specific height. Formed at the time. Further, in the case where the boxless molding machine 1 includes the lower frame 41, the lower molding space may be formed by the lower plate 40, the lower casting frame 17, the lower frame 41, and the mold plate 19.

In the upper molding space, the mold sand stored in the upper sand channel 22 is filled through the upper plate 25. The mold sand stored in the second lower tank 31 is filled through the lower plate 40 in the lower molding space. 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 within a range of 8 N/cm ² to 15 N/cm ² . Further, the thickness of the mold for molding is changed by the CB (Compactability) of the mold shape or the mold sand, and the target height of the second lower sand groove 31 varies depending on the thickness of the mold. That is, the height of the second connection port 38 of the second lower sand channel 31 changes. At this time, the height of the first connection port 35 of the first lower sand channel 30 is adjusted to the connection position of the second connection port 38 of the second lower sand channel 30 by the lower tank body 32. Such adjustment can be realized by the control device 50 (FIG. 3) described later.

The extrusion cylinder 37 is in a state in which the upper molding space and the lower molding space are filled with the molding sand, and the upper lower plate 30 and the lower plate 40 are pressed by moving the second lower sand groove 31 upward. Thereby, pressure is applied to the mold sand of the upper molding space to form an upper mold. At the same time, a pressure is applied to the mold sand of the lower molding space to form a lower mold.

[molding sand into the chute]

The mold sand is introduced into the chute 24 at the upper end portion, and the lower end portion is divided into two portions. A switching flapper 43 is provided at the upper end. The switching flap 43 changes the inclination direction in order to drop the mold sand for any of the lower end portions. Further, the lower end portion of the mold sand input chute 24 is fixed to the upper portion of the upper sand chute 22, and the other lower end portion of the mold sand input chute 24 is housed in the funnel 34, and is not fixed. As described above, the lower tank body 32 can control the height of the first joint port 35 of the first lower sand tank 30 independently of the upper sand tank 22 by not fixing the lower end portion of the first lower sand tank 30 side.

[Details of the lower board]

Fig. 8 is a perspective view showing the upper surface side of the lower plate 40. Figure 9 is a perspective view of the lower surface side of the lower plate 40. Figure 10 is a cross-sectional view taken along line X-X of Figure 8. As shown in FIGS. 8 to 10, the lower plate 40 has at least one supply port 40a. In the figure, as an example, 15 supply ports 40a are formed. The inner faces of the respective supply ports 40a are inclined such that the opening of the upper surface 40c of the lower plate 40 is narrower than the opening of the lower surface 40b of the lower plate 40. With such a shape (reverse cone shape), it is possible to prevent the casting port 40a from strongly compressing the molding sand during extrusion. That is, such a shape, under When the secondary sand is supplied, the surface sand can be blocked by the supply port 40a.

Further, a lower surface 40b of the lower plate 40 is provided with a projection 40d having an inclined surface that faces one or a plurality of supply ports 40a. The cross section of the projection 40d in the XZ plane is substantially triangular. The inclination of the inclined surface of the projection 40d is the same as the inclination of the inner surface of the supply port 40a. Thereby, the mold sand is smoothly supplied to the supply port 40a by the projection 40d. Further, by providing the projections 40d, it is possible to prevent the mold sand from remaining between the supply ports 40a.

A nozzle plate (nozzle) 44 or a closing plate 45 may also be disposed on the upper surface 40c of the lower plate 40. The nozzle plate 44 is a plate-like member and is formed with an opening 44a that communicates with the supply port. The inclination of the inner surface of the opening 44a may be the same as the inclination of the supply port 40a, or may be different. Further, the position at which the opening 44a is formed can be appropriately set. For example, the opening 44a may be formed at a position displaced from the center of the nozzle plate 44 in the X-axis direction or the Y-axis direction, and the injection direction may be changed to the horizontal direction by making the supply port 40a different from the opening 44a. Thereby, for example, when the model has a deep position, the nozzle plate 44 can be disposed in order to supply the mold sand to a deep position. Further, the injection direction can be controlled by making the opening direction of the opening 44a (the axial direction of the opening) at an angle with respect to the vertical direction. Thereby, even a complicated model can reliably fill the mold sand. The closing plate 45 is a plate-like member and does not form an opening. The closing plate 45 is used to cover a supply port selected in advance from a plurality of supply ports 40a. For example, in the case where the model has a shallow position, it is disposed to cover the supply port 40a corresponding to the shallower position. Thus, the spray plate 44 and the closing plate 45 can be appropriately selected depending on the model. Further, the nozzle plate 44 and the closing plate 45 are formed, for example, in the same thickness, and each upper surface is located on the same plane. Thereby, the upper and lower molds can be extruded out of the apparatus.

[Details on the board]

Figure 11 is a perspective view of the lower surface side of the upper plate 25. Fig. 12 is a perspective view showing the upper surface side of the upper plate 25. Figure 13 is a cross-sectional view taken along line XIII-XIII of Figure 11 . As shown in FIGS. 11 to 13, the upper plate 25 has at least one supply port 25a. In the figure, as an example, 15 supply ports 25a are formed. The inner surface of each supply port 25a is inclined such that the opening of the lower surface 25b of the upper plate 25 is higher The opening of the upper surface 25c of the plate 25 is narrower. By such a shape (reverse cone shape), it is possible to prevent the casting port 25a from strongly compressing the molding sand during extrusion. That is, in such a shape, the mold sand is fixed at the time of extrusion without being dropped by gravity, and at the same time, the sand is prevented from being clogged with the supply port 25a at the time of the next sand supply.

Further, a projection 25d having an inclined surface that faces one or a plurality of supply ports 25a is provided on the upper surface 25c of the upper plate 25. The cross section of the projection 25d in the XZ plane is substantially triangular. The inclination of the inclined surface of the projection 25d is the same as the inclination of the inner surface of the supply port 25a. Thereby, the mold sand is smoothly supplied to the supply port 25a by the projections 25d. Further, by providing the projections 25d, it is possible to prevent the mold sand from remaining between the supply ports 25a.

A nozzle plate (nozzle) 46 or a closing plate 47 may also be disposed on the lower surface 25b of the upper plate 25. The nozzle plate 46 is a plate-like member and is formed with an opening 46a that communicates with the supply port. The inclination of the inner surface of the opening 46a may be the same as the inclination of the supply port 25a, or may be different. Further, the position at which the opening 46a is formed can be appropriately set. For example, the opening 46a may be formed at a position displaced from the center of the nozzle plate 46 in the X-axis direction or the Y-axis direction, and the injection direction may be changed to the horizontal direction by making the supply port 25a and the opening 46a different axes. Thereby, for example, when the model has a deep position, the nozzle plate 46 can be disposed in order to supply the mold sand to a deep position. Further, the injection direction can be controlled by setting the opening direction of the opening 46a (the axial direction of the opening) with respect to the vertical direction. Thereby, even a complicated model can reliably fill the mold sand. The closing plate 47 is a plate-like member and an opening is not formed. The closing plate 47 is used to cover a supply port selected in advance from a plurality of supply ports 25a. For example, when the model has a shallow position, it is disposed to cover the supply port 25a corresponding to the shallower position. Thus, the spray plate 46 and the closing plate 47 can be appropriately selected depending on the model.

[bushing]

The upper casting frame 15, the lower casting frame 17, and the second lower sand channel 31 are movably attached to the four guide members 12 by a cylindrical bushing. The upper casting frame 15 will be described as an example. Fig. 14 is a schematic view showing the bushing 49. Figure 15 is a cross-sectional view of Figure 14. As shown in Figure 14 and Figure 15, the upper cast The frame 15 is movably mounted to the guide 12 by mounting the bushing 15 at its upper and lower ends. The cylindrical bushing 49 can also be constructed by combining a plurality of members. Specifically, the bushing 49 may be combined with a member facing the half in the axial direction. Figure 16 is a plan view showing the removal of the half bushing 49. Figure 17 is a cross-sectional view showing the detachment of the half bushing 49. As shown in FIGS. 16 and 17, by using the half bushing 49, it is possible to remove only the lining without removing the upper casting frame 15, the lower casting frame 17, and the second lower sand groove 31 from the guide 12. The sleeve 49 is replaced, so the maintainability is excellent.

[control device]

The boxless molding machine 1 can also include a control device 50. The control device 50 includes a control unit such as a processor, a memory unit such as a memory, an input/output unit such as an input device, a display device, and the like, and a computer such as a communication unit such as a network card, and controls the boxless molding machine 1 Each part, such as a mold sand supply system, a compressed air supply system, a drive system, and a power supply system. In the control device 50, an input device is used, an operator can perform an input operation for managing a command of the no-box molding machine, and the display device can visualize the operation state of the no-box molding machine 1. display. Furthermore, in the memory portion of the control device 50, a control program for controlling various processes executed by the no-box molding machine 1 by the processor is stored, or for no-box molding according to the molding conditions. Each component of the machine 1 executes a program for processing.

[modeling processing]

The molding process of the present embodiment will be briefly described. Fig. 18 is a flow chart showing the molding process of the boxless molding machine of one embodiment. The molding process shown in Fig. 18 is a process of molding a set of upper and lower molds. The molding process shown in Fig. 18 is automatically started by setting the posture of the no-box molding machine 1 to the original position (initial position) as one of the conditions. When the posture of the boxless molding machine 1 is not the original position, it is moved to the original position by a manual operation. When the automatic start button is pressed in the posture (original position) of the boxless molding machine 1 as shown in Fig. 3, the molding process as shown in Fig. 18 is started.

In the case where the modeling process is started, the shuttle process is first performed (S12). Fig. 19 is a schematic view showing the shuttle processing. As shown in Fig. 19, in the shuttle process, the transfer cylinder 21 will carry The conveying plate 20 on which the mold plate 19 is placed is moved to the molding position.

Next, a frame setting process is performed (S14). Fig. 20 is a schematic diagram for explaining a frame setting process. As shown in Fig. 20, in the frame setting process, the upper casting frame cylinder 16, the lower casting frame cylinder 18 (Fig. 2), the lower frame cylinder 42 and the extrusion cylinder 37 are matched with the thickness of the mold to be molded. Telescopic. Thereby, the upper casting frame 15 is moved to a specific position, and the lower casting frame 17 abuts against the mold plate 19, and thereafter, by casting the casting frame 17 under the mold plate 19 to a specific position, it becomes a casting. The state of the mold plate 19 is sandwiched between the frame 15 and the lower casting frame 17. Further, the second lower sand chute 31 and the lower frame 41 are raised, and the lower frame 41 is in contact with the lower casting frame 17. Moreover, the first lower sand groove 30 is moved in the vertical direction by the expansion and contraction of the lower tank 32, and the height of the first connection port 35 of the first lower sand groove 30 and the second connection port of the second lower sand groove 31 are formed. The height of 38 is consistent. At this time, the upper molding space and the lower molding space are in a state (height) determined by the control device 50.

Next, aeration treatment is performed (S16). Fig. 21 is a schematic view showing the ventilation process. As shown in FIG. 21, in the ventilation process, the sealing mechanism seals the first connection port 35 of the first lower sand channel 30 and the second connection port 38 of the second lower sand channel 31. Further, the sliding door 23 of the upper sand channel 22 and the sliding door 33 of the first lower sand channel 30 are closed, and the compressed air source and the electro-pneumatic proportional valve supply compressed air to the upper sand tank 22 and the first lower sand tank 30. Thereby, while the mold sand flows, the mold sand is filled in the upper mold space and the lower mold space. As an example, when the set pressure and time are satisfied, the ventilation process is terminated.

Next, an extrusion process is performed (S18). Fig. 22 is a schematic view showing the extrusion process. As shown in Fig. 22, in the pressing process, the sealing mechanism operated by the aeration process (S16) is released from the sealing, and the second lower grit 31 is further raised by further elongating the extrusion cylinder 37. Thereby, the plate 40 is installed in the lower frame 41 under the second lower sand channel 31, and the mold sand in the molding space is compressed, and the upper plate 25 enters the upper casting frame 15 to compress the upper molding space. Molded sand. When the extrusion 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 extrusion process is terminated. In addition, in the extrusion process, the upper casting frame cylinder 16, the lower casting frame cylinder 18, and the lower frame cylinder 42 are controlled by a hydraulic circuit. At the time, each cylinder system is set to a free circuit. Thereby, each cylinder shrinks due to the pressing force.

Next, a mold release process is performed (S20). Fig. 23 is a schematic view showing the demolding process. As shown in Fig. 23, in the demolding process, the lower frame cylinder 42 is contracted to lower the lower frame 41. Thereafter, the extrusion cylinder 37 is contracted to lower the second lower sand tank 31, and then the casting mold plate 19 and the casting frame 17 below the conveying plate 20 are lowered. Further, the mold release from the upper casting frame 15 is performed. When the lower casting frame 17 is lowered to a fixing portion (not shown), the mold plate 19 and the conveying plate 20 are supported by the fixing portion. Thereby, the mold release from the lower casting frame 17 is performed.

Next, a shuttle process is performed (S22). Fig. 24 is a schematic view showing the shuttle processing. As shown in FIG. 24, in the shuttle processing, the conveyance plate 20 is moved to the retracted position by the contraction of the conveyance cylinder 21. In the state shown in Fig. 24, the core is placed on the upper casting frame 15 or the lower casting frame 17, if necessary.

Next, the frame closing process is performed (S24). Fig. 25 is a schematic view showing the framing process. As shown in Fig. 25, in the framing process, the lower casting frame cylinder 18 is contracted, and the extrusion cylinder 37 is extended, and the lower casting frame 17 and the second lower sand groove 31 are raised to be framed.

Next, the frame drawing process is performed (S26). Fig. 26 is a schematic view showing the frame drawing process. As shown in Fig. 26, in the frame drawing process, the upper casting frame cylinder 16 and the lower casting frame cylinder 18 are contracted, and the upper casting frame 15 and the lower casting frame 17 are raised to the rising end to be framed.

Next, the first frame separation processing is performed (S28). Fig. 27 is a schematic diagram for explaining the first frame separation processing (first half). As shown in Fig. 27, in the first frame separation process, the extrusion cylinder 37 is contracted and the second lower sand groove 31 is placed in a state where the mold is placed on the lower plate 40 of the second lower sand channel 31. decline. At this time, the lower casting frame cylinder 18 is extended, and the lower casting frame 17 is lowered, and at the same time, it stops at a position where it is not obstructed when the mold is carried out.

Next, a molding extrusion process is performed (S30). Fig. 28 is a schematic view showing a molding extrusion process. As shown in Fig. 28, in the molding extrusion process, the extrusion mold 48 (see Fig. 2) is stretched, and the upper mold and the lower mold are carried out to the outside of the apparatus (for example, a mold line).

Next, the second frame separation processing is performed (S32). Fig. 29 is a schematic diagram for explaining the second frame separation processing (second half). As shown in Fig. 29, in the second frame separating process, the lower casting frame cylinder 18 is extended, and the lower casting frame 17 is returned to the original position.

In the above, the process of molding a set of upper and lower molds is completed.

[Position adjustment of the first lower sand tank]

The details of the position adjustment of the first lower sand channel 30 performed in the above-described frame setting process (S14) will be described. The position adjustment is achieved by the control device 50. Figure 30 is a functional block diagram of the control device 50 of the boxless molding machine 1 of the embodiment. As shown in FIG. 30, the control device 50 is connected to the first detector 51, the second detector 52, the third detector 53, the fourth detector 54, the fifth detector 55, and the lower tank 32. Further, the control device 50 does not need to be connected to all of the first detector 51 to the fifth detector 55. For example, the control device 50 may be connected only to the first detector 51 and the second detector 52, or may be connected only to the third detector 53 to the fifth detector 55. Further, the boxless molding machine 1 does not need to have all of the first detector 51 to the fifth detector 55.

The first detector 51 detects the height position of the first lower sand groove 30. Fig. 31 is a plan view showing an example of the first detector 51. Fig. 32 is a front view showing an example of the first detector 51. As shown in FIGS. 31 and 32, the first detector 51 includes a magnet 60 and a magnetic field detecting unit 61. The magnet 60 is attached to the members 62 and 63 that move together with the first lower sand channel 30. The magnet 60 can also be directly attached to the first lower sand channel 30. The magnet 60 is an annular member in which a part of the magnet is notched. The magnetic field detecting unit 61 is attached to the support frame 14 which is a fixed frame, and includes a longitudinal member extending in the vertical direction, and detects a magnetic field generated between the magnets 60. The magnetic field detecting unit 61 is provided along the moving direction of the first lower sand channel 30. The magnet 60 is disposed such that the magnetic field detecting unit 61 is located inside. Since the magnet 60 is moved simultaneously with the first lower sand groove 30, the first detector 51 can detect the height position (absolute position) of the first lower sand groove 30 by detecting the position of the magnetic field.

The second detector 52 detects the height position of the second lower sand channel 31 (lower plate 40). Since the configuration of the second detector 52 is the same as that of the first detector 51, the description thereof is omitted. In the case of the second detector 52, as an example, the magnet 60 is placed in the second lower sand channel 31, and is formed in the frame of the mold making portion A1. The fixing member such as the magnetic field detecting portion 61 is provided.

The third detector 53 detects the height position of the upper casting frame 15. Since the configuration of the third detector 53 is the same as that of the first detector 51, the description thereof is omitted. In the case of the third detector 53, as an example, the magnet 60 is placed in the upper casting frame 15, and the magnetic field detecting portion 61 is provided in a fixing member such as a frame of the molding portion A1.

The fourth detector 54 detects the height position of the lower casting frame 17. Since the configuration of the fourth detector 54 is the same as that of the first detector 51, the description thereof is omitted. In the case of the fourth detector 54, as an example, the magnet 60 is placed in the lower casting frame 17, and the magnetic field detecting portion 61 is provided in a fixing member such as a frame of the molding portion A1.

The fifth detector 55 detects the height position of the lower frame 41. Since the configuration of the fifth detector 55 is the same as that of the first detector 51, the description thereof is omitted. In the case of the fifth detector 55, as an example, the magnet 60 is placed in the lower frame 41, and the magnetic field detecting portion 61 is provided in a fixing member such as a frame of the mold making portion A1.

The control device 50 includes an identification unit 70, a control unit 80, and a storage unit 90. The identification unit 70 recognizes the height position (the height position of the first connection port 35) of the first lower sand groove 30 during the movement and the completion of the movement based on the detection result of the first detector 51. The identification unit 70 recognizes the height position (the height position of the second connection port 38) of the second lower sand groove 31 during the movement and the completion of the movement based on the detection result of the second detector 52. The identification unit 70 recognizes the height position of the upper casting frame 15 and the completion of the movement based on the detection result of the third detector 53. The identification unit 70 recognizes the height position and movement completion of the lower casting frame 17 based on the detection result of the fourth detector 54. The recognition unit 70 recognizes the height position of the moving lower frame 41 and the completion of the movement based on the detection result of the fifth detector 55. In this way, the recognition unit 70 can recognize the height position and the movement completion of the movement of each constituent element based on the result of the detector. Moreover, the identification unit 70 can also recognize the thickness of the upper mold at the time of completion of the extrusion based on the height position of the upper casting frame 15 detected by the third detector 53 at the time of completion of the extrusion. Moreover, the identification unit 70 is based on the height position of the second lower sand groove 31 (lower plate 40) detected by the second detector 52 when the extrusion is completed, and by the fifth detection. The height of the frame 41 is detected by the device 55 when the extrusion is completed, and the thickness of the mold under the completion of the extrusion can also be recognized.

The identification unit 70 is a second lower sand groove 31 detected by the third detector 53 when the extrusion is completed, and the second detector 52 detects the completion of the extrusion. The height position of the lower plate 40) and the height position of the frame 41 detected by the fifth detector 55 when the extrusion is completed are stored in the memory portion 90 as a result of modeling. At this time, the identification unit 70 can also store the modeling conditions in association with the modeling result and memorize the memory unit 90. The molding conditions are pre-set conditions at the time of molding, for example, the model model, the model shape, and the target height position of each constituent element. In this way, the identification unit 70 and the storage unit 90 obtain the actual performance information and memorize it.

The control unit 80 determines the height position of the casting frame 15 and the height position of the lower frame 41 on the next sand filling based on the second modeling result stored in the storage unit 90. In this manner, the control unit 80 performs feedback control based on the detection results of the third detector 53 and the fifth detector 55.

Further, the identification unit 70 may not only detect the detection results of the third detector 53 and the fifth detector 55, but also the detection results of the other combinations selected from the first detector 51 to the fifth detector 55, all the detection results, The thickness of the upper mold and the lower mold is stored in the memory portion 90 as a result of molding. In this case, the control unit 80 can perform feedback control different from the above-described feedback control based on the modeling result stored in the memory unit 90. For example, the control unit 80 may also be based on the height position of the first lower sand channel 30 (the height position of the first connection port 35) detected by the first detector 51 at the completion of the extrusion, and by the completion of the extrusion. The height position of the second lower sand groove 31 detected by the second detector 52 (the height position of the second connection port 38) is determined by the height position and the second lower position of the first lower sand groove 30 at the time of the next sand filling. The height position of the sand groove 31. Thereby, the control unit 80 can cause the squeeze cylinder 37 and the lower tank to match the height positions of the first connection port 35 and the second connection port 38 based on the detection results of the first detector 51 and the second detector 52. Body 32 operates.

Fig. 33 is a flow chart for explaining the target setting processing of the boxless molding machine 1 of the embodiment. The processing shown in Fig. 33 is executed in the frame setting processing (S14). Initially, the control department The acquisition result obtained by the memory unit 90 is acquired as the information acquisition processing (S40). Next, the control unit 80 determines the target value of the height position of the first connection port 35 as the target value setting process (S42). The control unit 80 determines the height position of the first connection port 35 in order to cancel the difference, for example, when there is a difference between the height position of the first first connection port 35 and the height position of the previous second connection port 38. The target value. As described above, the target setting processing of the boxless molding machine 1 is ended.

As described above, according to the boxless molding machine 1 of the present embodiment, the sand groove for supplying the mold sand to the lower casting frame 17 is divided into the first lower sand groove 30 and the second lower sand groove 31, and the cylinder 37 is pressed. The second lower sand groove 31 moves in the vertical direction, and the lower first sand groove 30 is moved upward and downward by the lower tank. In this manner, since the first lower sand channel 30 and the second lower sand channel 31 can be vertically moved up and down, the first lower sand channel can be adjusted so as to match the height of the second connection port 38 of the second lower sand channel 31. The height of the first connection port 35 of 30. Thereby, the flow of the mold sand of the connection portion between the first connection port 35 and the second connection port 38 is the same, and the occurrence of sand clogging can be suppressed. Therefore, it is possible to adjust the mold sand of the mold sand without considering the clogging of the sand, and it is possible to use the mold sand which is the best for the mold moldability or the quality of the cast product, and as a result, an excellent mold and cast product can be obtained.

Further, according to the boxless molding machine 1 of the present embodiment, only the divided second lower sand grooves 31 can be moved up and down to complete the filling and pressing of the mold sand to the lower casting frame 17. When the first lower sand channel 30 is fixedly connected to the sand groove of one of the second lower sand grooves 31, since a load larger than the right side is applied to the left side of the groove, there is a case where the groove rises at an angle and falls. The angle is different. Such a difference in angle is caused by the mold release failure caused by the removal of the mold from the pattern. On the other hand, according to the caseless molding machine 1 of the present embodiment, since the inclination due to the load imbalance can be reduced, an excellent mold and a cast product can be obtained as a result.

Further, according to the boxless molding machine 1 of the present embodiment, the compressed air is supplied from the side to the storage space through the entire surface of the transmission members 22a and 30a, so that the fluidity of the mold sand is improved. In this state, the molding sand is blown into the upper casting frame or the lower casting frame by the compressed air, whereby the blowing resistance of the molding sand can be reduced. Therefore, the power consumption of the compressed air source can be suppressed Consumption, while inhibiting sand blockage.

Further, according to the boxless molding machine 1 of the present embodiment, the mold sand existing in the supply port 25a of the upper plate 25 can be fixed by pressing force to the extent that it is not dropped by gravity after being pressed.

Further, according to the boxless molding machine 1 of the present embodiment, the mold sand is guided to the supply port by the projections 25d and 40d, so that the mold sand can be prevented from staying in the vicinity of the supply port.

Further, according to the boxless molding machine 1 of the present embodiment, by supplying the nozzle directions of the nozzle plates 44 and 46, the supply of the matching model shape can be performed.

Further, according to the boxless molding machine 1 of the present embodiment, since the supply port of the mold sand can be selectively supplied by the presence or absence of the closing plates 45 and 47, the supply of the mold shape can be performed.

Further, according to the boxless molding machine 1 of the present embodiment, since the upper casting frame 15, the lower casting frame 17, and the second lower sand channel 31 are movably attached to the four guide members 12, the upper casting frame 15 and the lower portion are stabilized. The movement of the casting frame 17 and the second lower sand channel 31. Thereby, the extrusion can be performed stably. Therefore, the properties of mold release and the like can be improved, and as a result, excellent molds and cast products can be obtained.

Further, according to the boxless molding machine 1 of the present embodiment, the upper casting frame 15, the lower casting frame 17, and the second lower sand casting groove 31 are movably attached to four guide members, and the four guide members 12 are used for surrounding. The upper casting frame 15 and the lower casting frame 17 are arranged so as to form a square-shaped molding space (upper molding space and lower molding space) in which the centers of the four guides 12 are apexes in the vertical direction, and four guides are formed. The workpiece 12 guides the upper casting frame 15, the lower casting frame 17, and the second lower sand channel 31 in the vertical direction at the time of sand filling, pressing, and demolding. In this manner, when the positions of the upper casting frame 15, the lower casting frame 17, and the second lower sand channel 31 are the same at the time of sand filling, pressing, and demolding, four guides 12 can be disposed.

Further, according to the caseless molding machine 1 of the present embodiment, even when the heights of the first connection port 35 and the second connection port 38 are different, the second connection port 38 can be covered by the first closing plate 36. The first connection port 35 can also be covered by the second closing plate 39. Therefore, the mold sand can be prevented from flowing out of the sand groove.

Further, according to the boxless molding machine 1 of the present embodiment, the mold sand CB filled in the upper molding space and the lower molding space is set to 30% to 42%, and the compression strength of the molding sand is set to 8 N/cm. The mold sand in the range of ² to 15 N/cm ² can provide excellent molds and cast products.

Further, the above embodiment shows an example of the boxless molding machine of the present invention. The boxless molding machine of the present invention is not limited to the boxless molding machine 1 of the embodiment, and the boxless molding machine 1 of the embodiment may be modified without changing the scope of the claims. For other uses.

For example, in the above embodiment, the case where the upper sand groove 22 is fixed to the upper frame 10 will be described, but the upper sand groove 22 may be configured to be movable.

Further, in the above embodiment, the control device 50 can control the moving speeds of the first lower sand chute 30 and the second lower sand chute 31 by using the detection results of the first detector 51 and the second detector 52. Similarly, the control device 50 can control the moving speeds of the upper casting frame 15, the lower casting frame 17, and the lower frame 41 by using the detection results of the third detector 53, the fourth detector 54, and the fifth detector 55. For example, when the control device 50 detects that the target position has been approached (detecting that it is within a certain distance from the specific position), the moving speed may also be lowered to a specific value. By such control, the influence of contact and the shortening of the molding time of the upper mold and the lower mold can be achieved.

1‧‧‧No box moulding machine

10‧‧‧Upper frame

11‧‧‧ Lower frame

12‧‧‧ Guides

14‧‧‧Support framework

15‧‧‧Upper casting frame

16‧‧‧Upper casting frame cylinder

17‧‧‧ casting frame

22‧‧‧Upper sand tank

22a‧‧‧through components

23‧‧‧Sliding door

24‧‧‧ mold sand into the chute

25‧‧‧Upper board

30‧‧‧1st lower sand trap

30a‧‧‧through components

30b‧‧‧Pipe

31‧‧‧2nd lower sand trap

32‧‧‧ lower tank

33‧‧‧Sliding door

34‧‧‧ funnel

35‧‧‧1st connection

36‧‧‧1st closing plate

37‧‧‧Extrusion cylinder

38‧‧‧2nd connection

39‧‧‧2nd closing plate

40‧‧‧ Lower board

41‧‧‧Under frame

43‧‧‧Switching baffle

50‧‧‧Control device

X‧‧‧ direction

Y‧‧‧ direction

Z‧‧‧ direction

Claims (14)

A boxless molding machine for molding a mold without a casting frame and a lower molding die, comprising: an upper casting frame; a lower casting frame disposed under the upper casting frame and capable of being combined with the above The casting frame is clamped together with the mold plate; the upper sand groove is disposed above the upper casting frame, connected to the compressed air source, and the lower end portion thereof is opened, and the molding sand is stored therein; the upper plate is mounted on the upper plate The lower end portion of the sand groove forms at least one supply port communicating from the upper sand groove into the upper casting frame; the first lower sand groove is connected to a compressed air source, and stores mold sand therein, and has discharge storage a first connection port of the mold sand; a second lower sand groove disposed below the lower casting frame, the upper end portion being open, and having a second connection port connectable to the first connection port of the first lower sand channel And storing the mold sand supplied from the first lower sand tank and supplied into the lower casting frame; the lower plate is attached to the upper end portion of the second lower sand groove, and is formed from the second lower sand groove toward the lower portion At least one supply port communicating in the casting frame; and a driving portion for the second lower sand channel The vertical direction, the upper plate to the lower plate and the extrusion; and adjusting a drive section, which at first so that the movement in the vertical direction of a sand trap. The containerless molding machine of claim 1, wherein: the upper mold, the upper casting frame and the model plate are formed to mold a molding space above the upper mold, and the upper plate is stored on the upper plate The mold sand of the sand groove is filled into the upper mold space, and is attached to the second lower sand tank that is moved to a specific height by the driving portion. The lower plate, the lower casting frame, and the mold plate form a molding space under the lower mold, and the height of the first connection port of the first lower sand groove is adjusted by the adjustment driving unit. The mold sand stored in the first lower sand tank is supplied to the second lower sand tank at a connection position of the second connection port of the second lower sand tank, and is stored in the second lower sand tank through the lower plate. The mold sand is filled in the lower mold space, and the mold cavity is filled with the mold sand in the upper mold space and the lower mold space, and the second lower sand groove is moved upward by the drive unit. The upper plate and the lower plate are extruded. The boxless molding machine of claim 2, comprising: a lower frame, wherein the lower molding space is formed by the lower plate, the lower casting frame, the lower frame, and the model plate. The boxless molding machine according to any one of claims 1 to 3, wherein the upper sand tank and the first lower sand tank are provided with a plurality of perforated members having a plurality of holes through which compressed air can flow. The no-box molding machine according to any one of claims 1 to 4, wherein: the inner surface of the at least one supply port of the upper plate is such that an opening of a lower surface of the upper plate is higher than an upper surface of the upper plate The opening is inclined in a narrower manner. The boxless molding machine according to any one of claims 1 to 4, wherein the upper surface of the upper plate is provided with a projection having an inclined surface inclined toward the at least one supply port of the upper plate. The boxless molding machine according to any one of claims 1 to 6, further comprising: a nozzle disposed on a lower surface of the upper plate and communicating with the at least one supply port. A boxless molding machine according to any one of claims 1 to 7, wherein: The at least one supply port of the upper plate is composed of a plurality of supply ports, and a closing plate that covers a supply port selected in advance from the plurality of supply ports is disposed on a lower surface of the upper plate. The boxless molding machine according to any one of claims 1 to 8, wherein: the inner surface of the at least one supply port of the lower plate is inclined such that an opening of the upper surface of the lower plate is lower than a lower surface of the lower plate The opening is narrower. The boxless molding machine according to any one of claims 1 to 9, wherein a lower surface of the lower plate is provided with a projection having an inclined surface inclined toward the at least one supply port of the lower plate. The boxless molding machine according to any one of claims 1 to 10, further comprising: a nozzle disposed on an upper surface of the lower plate and communicating with the at least one supply port. The boxless molding machine according to any one of claims 1 to 11, wherein the at least one supply port of the lower plate is composed of a plurality of supply ports, and is disposed on the upper surface of the lower plate from the above A plurality of supply ports pre-selected closure plates for the supply ports. The boxless molding machine according to any one of claims 1 to 12, wherein the upper casting frame, the lower casting frame, and the second lower sand channel are movably attached to the four guide members. The boxless molding machine according to any one of claims 1 to 13, wherein the first connection port and the second connection port are connected to each other at a connection surface in a vertical direction, and the first connection port is formed The front end portion of the first lower sand groove is provided in a first closing plate extending in the vertical direction, and is provided at a side portion of the second lower sand groove in which the second connection port is formed, and is provided in a second closing direction extending in the vertical direction. board.