JP6536480B2 - Blanking machine - Google Patents

Description

  The present disclosure relates to a frame forming machine.

  Patent Documents 1 and 2 disclose a frame forming machine for forming a frameless mold having no frame. This molding machine includes a pair of upper and lower flasks for holding a match plate on which a model is installed, a feeding mechanism for feeding mold sand, and a squeeze mechanism for compressing mold sand. The molding machine brings the lower flask close to the upper flask and puts the match plate between the upper flask and the lower flask. In this state, the molding machine operates the supply mechanism to supply mold sand to the upper and lower molding spaces formed by the upper and lower flasks. The molding machine compresses the mold sand in the upper and lower molding space by operating the squeeze mechanism. Through the above steps, the upper and lower molds are simultaneously formed.

  The squeeze mechanism of the molding machine includes an upper squeeze cylinder and a lower squeeze cylinder. The upper squeeze cylinder applies downward pressure to mold sand in the upper molding space, and the lower squeeze cylinder applies upward pressure to mold sand in the lower molding space. This increases the hardness of the mold sand. Hydraulic cylinders are used as the upper squeeze cylinder and the lower squeeze cylinder.

  The molding machine includes a hydraulic circuit that controls the hydraulic pressure of the upper squeeze cylinder and a hydraulic circuit that controls the hydraulic pressure of the lower squeeze cylinder. As a result, the difference between the upper and lower squeeze forces is adjusted to be within the allowable range. Specifically, the extension operation of the squeeze cylinder having the higher squeeze force is interrupted until the difference between the upper and lower squeeze forces falls within the allowable range.

JP, 2008-161931, A Patent No. 4321654

  By the way, when non-uniform pressure is applied to mold sand, molds with partially different hardness are molded. For this reason, the devices described in Patent Documents 1 and 2 have room for improvement so as to apply more uniform pressure to mold sand. There is a need in the art for a mold removal machine for forming superior mold or cast products.

  The frame forming machine according to one aspect of the present invention is a frame forming machine for forming an upper mold and a lower mold of a non-casting frame, which is disposed under the upper flask and the upper flask, the upper flask Together with a lower flask capable of holding the match plate, a lower flask drive for moving the lower flask vertically, and an upper part of the lower flask which can be connected to the lower opening of the lower flask. A lower filling frame having an opening, an upper plate capable of entering and exiting the upper opening of the upper molding frame, a lower plate capable of entering and exiting the lower opening of the lower filling frame, and an upper molding hydraulic pressure connected to the upper molding frame A cylinder, a first hydraulic circuit for moving the upper form hydraulic cylinder in the vertical direction, a lower filling hydraulic cylinder connected to the lower filling frame, and a second hydraulic circuit for moving the lower filling hydraulic cylinder in the vertical direction And a drive unit for moving the lower plate upward to perform squeeze processing, and the first hydraulic circuit includes The first hydraulic circuit includes a first back pressure circuit for applying a first back pressure to the upper flask hydraulic cylinder, which resists the upward movement of the upper flask with respect to the upper plate during processing, and the second hydraulic circuit It has a second back pressure circuit which provides the lower filling frame hydraulic cylinder with a second back pressure that resists the downward movement of the lower filling frame relative to the lower plate during the squeeze processing.

  In this frame-forming machine, the lower plate is moved upward by the drive unit, and squeeze processing is performed. In this molding machine, for example, when the squeeze force to the upper mold is large, the first back pressure circuit top casts the first back pressure that resists the upward movement of the upper flask relative to the upper plate. Can be applied to the frame hydraulic cylinder. In addition, for example, when the squeeze force to the lower mold is large, this molding machine uses the second back pressure circuit to generate a second back pressure that resists the downward movement of the lower filling frame relative to the lower plate. It can be applied to the lower fill frame hydraulic cylinder. Thus, this extrusion molding machine has a back pressure circuit that adjusts the balance of the upper and lower squeeze forces, so that uniform pressure can be applied to the mold sand, and as a result, an excellent mold or cast product Can be molded.

  In one embodiment, the first back pressure circuit and the second back pressure circuit may include a counterbalance valve. When configured in this manner, the molding machine can control the back pressure of the upper frame hydraulic cylinder and the lower fill hydraulic cylinder by controlling the oil that is discharged from the cylinder.

  In one embodiment, the counterbalance valve may be an electromagnetic relief valve capable of controlling pressure proportionally to the input voltage. When configured in this manner, the molding machine can dynamically set the back pressure by controlling the input voltage.

  The frame forming machine according to another aspect of the present invention is a frame forming machine for forming an upper mold and a lower mold of a non-casting frame, the upper flask having a first opening and a second opening, A lower flask having a fourth opening capable of holding the match plate between the third opening and the second opening of the upper flask, a fifth opening, and a third of the lower flask A lower filling frame having a sixth opening connectable to the opening, an upper plate capable of entering and exiting the first opening of the upper flask, a lower plate capable of entering and exiting the fifth opening of the lower filling frame A drawing frame cylinder for adjusting the positional relationship between the molding frame and the upper plate, a first hydraulic circuit for driving the drawing frame cylinder, an upper squeeze cylinder for moving the upper plate, a lower squeeze cylinder for moving the lower plate, A squeeze cylinder and a squeeze hydraulic circuit for driving the lower squeeze cylinder; The circuit has a first back pressure circuit that provides a first back pressure to the frame cylinder that resists movement of the upper plate toward the match plate during squeeze processing of the upper squeeze cylinder and the lower squeeze cylinder. The squeeze hydraulic circuit is a second back pressure circuit that provides the lower squeeze cylinder with a second back pressure that resists movement of the lower plate toward the match plate during squeeze processing of the upper squeeze cylinder and the lower squeeze cylinder. Have.

  In this frame-forming machine, the upper plate and the lower plate are moved by the upper squeeze cylinder and the lower squeeze cylinder, and the squeeze process is performed. In this molding machine, for example, when the squeezing force in the direction in which the upper plate approaches the match plate is larger than the squeezing force in the direction in which the lower plate approaches the match plate, the upper plate A first back pressure can be applied to the draw cylinder that resists movement in a direction towards the match plate. Further, in this molding machine, for example, when the squeezing force in the direction in which the lower plate approaches the match plate is larger than the squeeze force in the direction in which the upper plate approaches the match plate, the lower plate A second back pressure can be applied to the lower squeeze cylinder that resists movement towards the match plate. In this way, since this mold removal molding machine has a back pressure circuit that adjusts the balance of the squeeze force, uniform pressure can be applied to the mold sand, and as a result, an excellent mold or cast product is molded can do.

  A frame forming machine according to another aspect of the present invention is a frame forming machine for forming an upper mold and a lower mold of an unformed frame, which comprises an upper plate forming an upper forming space together with a match plate and an upper flask. A lower plate forming a lower molding space together with a match plate and a lower flask, a squeeze cylinder for applying a squeeze force to sand filled in the upper molding space and the lower molding space, a hydraulic circuit for driving the squeeze cylinder, and the squeeze A first back pressure circuit that provides a first back pressure that resists movement toward the upper plate and the match plate during squeeze processing by the cylinder, and a lower plate and the match plate approach during the squeeze processing by the squeeze cylinder And a second back pressure circuit that provides a second back pressure that resists movement in the direction.

  The squeeze processing is performed by the squeeze cylinder in this frame forming machine. In this molding machine, for example, when the squeezing force in the direction in which the upper plate approaches the match plate is larger than the squeezing force in the direction in which the lower plate approaches the match plate, the upper plate It can provide resistance to movement towards the match plate. In addition, this molding machine is, for example, lowered by the second back pressure circuit when the squeezing force in the direction in which the lower plate approaches the match plate is greater than the squeezing force in the direction in which the upper plate approaches the match plate. Resistance is provided to movement of the plate towards the match plate. In this way, since this mold removal molding machine has a back pressure circuit that adjusts the balance of the squeeze force, uniform pressure can be applied to the mold sand, and as a result, an excellent mold or cast product is molded can do.

  A frame forming machine according to another aspect of the present invention is a frame forming machine for forming an upper mold and a lower mold of an unformed frame, comprising a pair of upper and lower flasks, an upper flask and a lower case. A squeeze cylinder for applying a squeeze process to press mold sand filled in a flask with a predetermined squeeze force, a resistance generating mechanism for applying a resistance force against the squeeze force during the squeeze process by the squeeze cylinder Equipped with

  The squeeze processing is performed by the squeeze cylinder in this frame forming machine. In this molding machine, a resistance force generating mechanism applies a resistance force against the squeeze force. As described above, since this mold removal molding machine has a resistance generating mechanism for adjusting the balance of the squeeze force, uniform pressure can be applied to the mold sand, and as a result, an excellent mold or cast product can be obtained. It can be molded.

  The frame forming machine according to another aspect of the present invention is a frame forming machine for forming an upper mold and a lower mold of a non-casting frame, which is connected to a pair of the upper casting frame and the lower flask, and the lower flask A lower filling frame, a squeeze cylinder performing squeeze processing for pressing mold sand filled in the upper forming frame, the lower forming frame and the lower filling frame with a predetermined squeeze force, and a first hydraulic circuit driving the squeeze cylinder And a cylinder for moving the upper molding frame, the lower molding frame or the lower filling frame in the squeeze direction, and a second hydraulic circuit for driving the cylinder and for providing a back pressure that is a resistance against the squeeze force of the squeeze cylinder. .

  The squeeze processing is performed by the squeeze cylinder in this frame forming machine. In the molding machine, the second hydraulic circuit applies a resistance to the squeeze force to the cylinder for moving the upper flask, the lower flask or the lower fill in the squeeze direction. Thus, since this mold removal molding machine has the second hydraulic circuit for adjusting the balance of the squeeze force, uniform pressure can be applied to the mold sand, and as a result, an excellent mold or cast product can be obtained. It can be molded.

  According to various aspects and embodiments of the present invention, there is provided an extrusion molding machine for forming excellent mold or casting products.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view of the front side of the frame forming machine which concerns on one Embodiment. It is a front view of the frame forming machine which concerns on one Embodiment. It is a schematic diagram of the left-hand side of a formwork molding machine concerning one embodiment. It is a fragmentary sectional view in the state where the 1st lower sand tank and the 2nd lower sand tank were connected. It is a top view in the state where the 1st lower sand tank and the 2nd lower sand tank were connected. It is a schematic diagram of the 1st connection port of the 1st lower sand tank. It is a partial expanded sectional view of a sealing mechanism. It is a flowchart explaining the molding processing of the removal molding machine based on one Embodiment. It is a schematic diagram explaining shuttle in processing. It is a schematic diagram explaining frame set processing. It is a schematic diagram explaining aeration processing. It is a schematic diagram explaining squeeze processing. It is a schematic diagram explaining die-cutting processing. It is a schematic diagram explaining shuttle out processing. It is a schematic diagram explaining framing processing. It is a schematic diagram explaining frame omission processing. It is a schematic diagram explaining the 1st frame separation processing (the first half). It is a schematic diagram explaining mold extrusion processing. It is a schematic diagram explaining the 2nd frame separation processing (the second half). It is a hydraulic circuit of the removal frame molding machine which concerns on one Embodiment. It is a schematic diagram explaining the principal part of the frame forming machine concerning a modification. It is a principal part and hydraulic circuit of the frame forming machine which concerns on a modification.

  Hereinafter, embodiments will be described with reference to the attached drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and redundant description will be omitted. In the following, 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.

[Outline of the frame forming machine]
FIG. 1 is a perspective view of the front side of a frame forming machine 1 according to an embodiment. The frame forming machine 1 is a molding machine for forming the upper mold and the lower mold of an unformed frame. As shown in FIG. 1, the frame making machine 1 includes a molding unit A1 and a transport unit A2. In the molding portion A1, box-shaped upper and lower flasks that can operate in the vertical direction (Z-axis direction) are disposed. The transport unit A2 introduces the match plate on which the model is disposed to the molding unit A1. The upper and lower flasks of the molding portion A1 move so as to be close to each other, and hold the match plate. Mold sand is filled in the upper and lower flasks. The mold sand filled in the upper and lower flasks is pressed from above and below by the squeeze mechanism provided in the molding unit A1, and the upper and lower molds are simultaneously formed. Thereafter, the upper mold is pulled out of the upper flask, and the lower mold is pulled out of the lower flask, and is carried out of the apparatus. Thus, the frame making machine 1 forms the upper mold and the lower mold of a non-forming frame.

[Frame structure]
FIG. 2 is a front view of the frame forming machine 1 according to the embodiment. FIG. 3 is a schematic view on the left side of the frame forming machine 1 according to the embodiment. As shown in FIGS. 2 and 3, the form-removal machine 1 includes an upper frame 10, a lower frame 11, and four guides 12 connecting the upper frame 10 and the lower frame 11. The guide 12 is connected at its upper end to the upper frame 10 and at its lower end to the lower frame 11. The upper frame 10, the lower frame 11, and the four guides 12 constitute the frame of the above-described molding unit A1.

  The support frame 13 (FIG. 2) of the transport unit A2 is disposed on the side of the frame of the molding unit A1 (in 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 portion A1 (the positive direction of the Y axis). The support frame 14 supports a first lower sand tank described later.

[Upper flask and lower flask]
The frame making machine 1 is provided with an upper flask 15. The upper flask 15 is a box-shaped frame in which the upper end and the lower end are opened. The upper flask 15 is movably attached to the four guides 12. The upper flask 15 is supported by the upper flask cylinder 16 attached to the upper frame 10, and moves up and down along the guide 12 in accordance with the operation of the upper flask cylinder 16.

  The frame-forming machine 1 includes a lower flask 17 disposed below the upper flask 15. The lower flask 17 is a box-shaped frame in which the upper end and the lower end are opened. The lower flask 17 is movably attached to the four guides 12. The lower flask 17 is supported by two lower flask 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 flask cylinder 18. Hereinafter, the region surrounded by the guide 12 is also referred to as a modeling position.

  Between the upper flask 15 and the lower flask 17, a match plate 19 is introduced from the transport portion A2. The match plate 19 is a plate-like member in which models are disposed on both sides thereof, and advances and retracts between the upper flask 15 and the lower flask 17. As a specific example, the support frame 13 of the transport unit A2 is provided with a rail toward the shaping position, a roller-equipped transport plate 20 disposed on the rail, and a transport cylinder 21 for operating the transport plate 20. . The match plate 19 is disposed on the transport plate 20 and is disposed between the upper flask 15 and the lower flask 17 at the shaping position by the operation of the transport cylinder 21. The upper flask 15 and the lower flask 17 can hold the arranged match plate 19 in the vertical direction. Hereinafter, the area on the support frame 13 is also referred to as a retracted position.

[Sand tank]
The frame making machine 1 includes an upper sand tank 22 disposed above the upper flask 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 stores mold sand to be supplied to the upper flask 15 therein. The upper sand tank 22 is open at its upper end and lower end. At the upper end portion of the upper sand tank 22, a slide gate 23 is provided for sliding a plate-like shielding member in the horizontal direction (the positive and negative directions of the X axis). The upper end portion of the upper sand tank 22 is configured to be openable and closable by the operation of the slide gate 23. Further, above the upper sand tank 22, a mold sand input chute 24 for inserting mold sand is fixedly disposed. The mold sand input chute 24 will be described later. When the slide gate 23 is open, mold sand is supplied to the upper sand tank 22 via the mold sand input chute 24.

  The lower end of the upper sand tank 22 is open, 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 communicating from the upper sand tank 22 into the upper flask 15. The mold sand in the upper sand tank 22 is supplied into the upper flask 15 through the supply port of the upper plate 25. The upper plate 25 is substantially the same as the size of the opening of the upper flask 15. As the upper flask 15 moves upward, the upper plate 25 enters into the upper flask 15. As the upper flask 15 moves downward, the upper plate 25 is withdrawn from the inside of the upper flask 15. Thus, the upper plate 25 is configured to be able to advance and retract in the upper flask 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 at its upper portion to a pipe 26 (FIG. 2) for supplying compressed air, and is connected to the compressed air source via the pipe 26. The pipe 26 is provided with an electro-pneumatic proportional valve 27 (FIG. 2). The electro-pneumatic proportional valve 27 not only switches supply and stop of compressed air, but also automatically adjusts the valve opening degree according to the pressure on the output side. Therefore, compressed air of a predetermined pressure is supplied to the upper sand tank 22. When the slide gate 23 is closed, the compressed air supplied from the upper portion of the upper sand tank 22 is fed toward the lower portion of the upper sand tank 22. The mold sand in the upper sand tank 22 is supplied into the upper flask 15 through the supply port of the upper plate 25 together with the compressed air.

  Further, the upper sand tank 22 is provided on its inner surface with a permeable member 22a (FIG. 3) having a plurality of holes through which compressed air can flow. As a result, compressed air is supplied to the entire internal space through the entire surface of the permeable member 22a, so that the fluidity of the mold sand is improved. The permeable member 22a may be formed of a porous material. The upper sand tank 22 is connected at its side with a pipe (not shown) for supplying compressed air and a pipe 29 (FIG. 2) for exhausting the compressed air. The pipe 29 is provided with a filter that allows the compressed air to pass through without passing the mold sand, and the mold sand can be prevented from being exhausted out of the upper sand tank 22.

  The frame-forming machine 1 includes a lower sand tank for storing mold sand supplied into the lower flask 17. The lower sand tank is divided into, for example, 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 to the side of the upper sand tank 22. The first lower sand tank 30 stores mold sand to be supplied to the lower flask 17 therein.

  The first lower sand tank 30 is supported by the support frame 14 and is movably attached to vertically extending guides 12A (FIG. 1) provided on the support frame 14. More specifically, the first lower sand tank 30 is supported by the lower tank cylinder (adjustment drive unit) 32 (FIG. 3) attached to the upper frame 10, and is guided by the guide 12A 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 open. At the upper end portion of the first lower sand tank 30, a slide gate 33 (FIG. 3) is provided for sliding a plate-like shielding member in the horizontal direction (the positive and negative directions of the X axis). The upper end portion of the first lower sand tank 30 is configured to be openable and closable by the operation of the slide gate 33. In addition, above the first lower sand tank 30, a hopper 34 (FIG. 3) for inserting mold sand is fixedly arranged. The connection between the hopper 34 and the mold sand input chute 24 will be described later. When the slide gate 33 is open, mold sand is supplied to the first lower sand tank 30 through the hopper 34.

  The lower end portion 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 end portion. 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 mold sand is supplied to the second lower sand tank 31 via the first connection port 35. In addition, a first closing plate 36 extending in the vertical direction is provided at the tip of the first lower sand tank 30. The second connection port of the second lower sand tank 31 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, a pipe (not shown) for supplying compressed air to the upper portion of the first lower sand tank 30 is connected, and the first lower sand tank 30 is connected to the compressed air source through the pipe. The piping is provided with an electro-pneumatic proportional valve (not shown). For this reason, compressed air of a predetermined pressure is supplied to the first lower sand tank 30. When the slide gate 33 is closed and the second connection port of the second lower sand tank 31 described later is in the connection position, compressed air is supplied from the upper portion of the first lower sand tank 30. Compressed air is fed toward the lower portion of the first lower sand tank 30, and 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. Be done.

  In addition, the first lower sand tank 30 is provided on its inner surface with a permeable member 30a having a plurality of holes through which compressed air can flow. As a result, compressed air is supplied to the entire internal space through the entire surface of the permeable member 30a, so that the fluidity of the mold sand is improved. The permeable member 30a may be formed of a porous material. A pipe 30b for exhausting compressed air is connected to the side of the first lower sand tank 30. The pipe 30 b (FIG. 3) is provided with a filter that allows the compressed air to pass through without passing the mold sand, so that the mold sand can be prevented from being exhausted out of the first lower sand tank 30.

  The second lower sand tank 31 is disposed below the lower flask 17. The second lower sand tank 31 stores mold sand to be supplied to the lower flask 17 therein. The second lower sand tank 31 is movably attached to the four guides 12 and is supported so as to be vertically movable by a squeeze cylinder (lower flask driving unit) 37 extending in the vertical direction.

  A second connection port 38 (FIG. 3) connectable to the first connection port 35 of the first lower sand tank is formed on the side portion 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 the height at which the first connection port 35 and the second connection port 38 are connected, and specifically, the position at which the first connection port 35 and the second connection port 38 are coaxially arranged. . The first connection port 35 and the second connection port 38 are connected at a connection surface along the vertical direction.

  FIG. 4 is a partial cross-sectional view of a state in which the first lower sand tank 30 and the second lower sand tank 31 are connected. FIG. 5 is a plan view of a state in which the first lower sand tank 30 and the second lower sand tank 31 are connected. As shown in FIGS. 4 and 5, the first lower sand tank 30 and the second lower sand tank 31 are mutually connected by connecting the first connection port 35 and the second connection port 38 at a predetermined connection position. It will be in the connected state. The 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. Further, the second connection port 38 of the second lower sand tank 31 is provided with a second closing plate 39 (FIGS. 3 to 5) extending in the vertical direction. Guide rails 71 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. By the second closing plate 39 being guided by the guide rail 71, 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 tank 30 is shielded by the second closing plate 39 when not located at the connection position.

  In addition, the removal frame molding machine 1 may be equipped with the sealing mechanism which seals the connecting surface of the 1st connection port 35 and the 2nd connection port 38 airtightly. For example, the sealing mechanism is provided on the first connection port 35 side. FIG. 6 is a schematic view of the first connection port 35 of the first lower sand tank 30, and is a view of the first connection port 35 viewed from the opened side. As shown in FIG. 6, the first connection port 35 includes an opening 35 a communicating with the inside of the first lower sand tank 30. The sealing mechanism includes a sealing member 72 and a holding member 73. The seal member 72 is an annular member surrounding the opening 35a. The seal member 72 has a tube shape capable of introducing a gas into the inside thereof and is flexible. The holding member 73 is an annular member surrounding the opening 35 a and abuts on the second closing plate 39. In the surface of the holding member 73 with which the second closing plate 39 abuts, a groove capable of accommodating the sealing member 72 is formed. FIG. 7 is a partially enlarged cross-sectional view of the sealing mechanism. As shown in FIG. 7, the seal member 72 is housed so as not to protrude from the surface of the holding member 73 with which the second closing plate 39 abuts. In the holding member 73, a gas introduction port 73a (FIGS. 4 to 7) communicating with the seal member 72 is formed. When the gas is introduced into the sealing member 72, the sealing member 72 expands and protrudes from the surface of the holding member 73 to airtightly seal the connection surfaces of the first connection port 35 and the second connection port 38. In addition, the removal frame molding machine 1 may employ | adopt sealing mechanisms other than the sealing mechanism shown by FIGS. 4-7.

  The upper end of the second lower sand tank 31 is open, 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 communicating with the lower frame 17 from the second lower sand tank 31. The mold sand in the second lower sand tank 31 is supplied into the lower flask 17 through the supply port of the lower plate 40 and the lower filling frame described later. Details of the lower plate 40 will be described later.

[Lower frame]
The frame forming machine 1 includes a lower filling frame 41 as an example. The lower filling frame 41 is disposed below the lower flask 17. The lower filling frame 41 is a box-shaped frame in which the upper end and the lower end are opened. The opening (upper opening) at the upper end of the lower filling frame 41 is connected to the opening (lower opening) at the lower end of the lower flask 17. The lower filling frame 41 is configured to be able to accommodate the second lower sand tank 31 therein. The lower filling frame 41 is supported by the lower filling frame cylinder 42 fixed to the second lower sand tank 31 so as to be able to move up and down. The lower plate 40 has substantially the same size as the openings of the lower filling frame 41 and the lower flask 17. The lower filling frame 41 capable of moving up and down has a position at which the second lower sand tank 31 and the lower plate 40 are accommodated therein as the original position (initial position), and is the falling end. As the lower filling frame 41 moves upward, the lower plate 40 exits from the lower filling frame 41. The lower plate 40 moves into the lower filling frame 41 as the lower filling frame 41 moved upward moves downward. Thus, the lower plate 40 is configured to be able to move in and out of the lower filling frame 41. Since the stroke of the lower flask 17 can be shortened by providing the lower filling frame 41, the blanking machine 1 has a lower height than the case where the lower filling frame 41 is not provided. It can be done. Moreover, since the stroke of the lower molding frame 17 can be shortened by providing the lower filling frame 41, the mold removal molding machine 1 can shorten the molding time of one set of upper mold and lower mold.

  The mold removal molding machine 1 may not have the lower filling frame 41. In this case, the lower plate 40 is configured to be able to move in (to and from) the lower flask 17. The lower end of the lower flask 17, which can move up and down, is at the original position (initial position). That is, the lower plate 40 moves into the lower flask 17 by moving relatively upward than the lower flask 17 moving upward. The lower plate 40 moves out of the lower flask 17 by moving relatively downward than the lower flask 17.

[Forming space and squeeze]
The molding space (upper molding space) of the upper mold is formed by the upper plate 25, the upper flask 15 and the match plate 19. The molding space (lower molding space) of the lower mold is formed by the lower plate 40, the lower flask 17, and the match plate 19. When the upper molding frame 16 and the lower molding space operate the upper molding cylinder 16, the lower molding cylinder 18 and the squeeze cylinder 37, and the upper molding 15 and the lower molding 17 hold the match plate at a predetermined height. Is formed. In the case where the extrusion frame molding machine 1 includes the lower filling frame 41, the lower molding space may be formed by the lower plate 40, the lower flask 17, the lower filling frame 41, and the match plate 19.

The upper mold space is filled with mold sand stored in the upper sand tank 22 via the upper plate 25. The lower molding space is filled with mold sand stored in the second lower sand tank 31 via the lower plate 40. The CB of mold sand filled in the upper mold forming space and the lower mold forming space may be set in the range of 30% to 42%. The compression strength of the molding sand filled in the upper molding space and the lower molding space ^can be set in the range of ^{8N / cm 2 ~15N / cm 2} . In addition, since the thickness of the mold to be formed changes with the model shape and CB (Compactability) of mold sand, the target height of the second lower sand tank 31 changes according to the thickness of the mold. 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 may be realized by the control device 50 (FIG. 3) described later.

  The squeeze cylinder 37 squeezes with 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 mold sand in the overmolding space to form the overmold. At the same time, pressure is applied to the mold sand in the lower molding space to form a lower mold.

[Mold sanding chute]
The upper end portion of the mold sand input chute 24 is opened, and the lower end portion is branched into two. A switching damper 43 is provided at the upper end. The switching damper 43 changes its tilt direction so that the mold sand falls to one of the branched lower end portions. Further, one lower end portion of the mold sand input chute 24 is fixed to the upper portion of the upper sand tank 22, and the other lower end portion of the mold sand injection chute 24 is accommodated in the hopper 34 and is not fixed. Thus, the lower tank cylinder 32 is independent of the height of the first connection port 35 of the first lower sand tank 30 from the upper sand tank 22 because the lower end portion on the first lower sand tank 30 side is not fixed. Can be controlled.

[Control device]
The frame forming machine 1 may include a control device 50. 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 a display device, and a communication unit such as a network card. Control mold sand supply system, compressed air supply system, drive system and power supply system. In this control device 50, the operator can perform an input operation of a command and the like in order to manage the frame forming machine 1 by using the input device, and the operation status of the frame forming machine 1 is displayed by the display device. It can be visualized and displayed. Furthermore, in the storage unit of the control device 50, the control program for controlling various processes executed by the frame forming machine 1 by the processor, and the processing of each component of the frame forming machine 1 according to the forming conditions. A program for execution is stored.

[Forming process]
The molding process according to the present embodiment will be outlined. FIG. 8 is a flowchart illustrating the molding process of the frame forming machine according to an embodiment. The molding process shown in FIG. 8 is a process for molding a pair of upper mold and lower mold. The molding process shown in FIG. 8 is automatically activated under one of the conditions that the posture of the frame forming machine 1 is at the original position (initial position). When the posture of the extrusion molding machine 1 is not at the original position, it is operated manually to move it to the original position. When the automatic start button is pressed in the posture (original position) of the form-removal molding machine 1 shown in FIG. 3, the molding process shown in FIG. 8 is started.

  When the molding process is started, first, a shuttle in process (S12) is performed. FIG. 9 is a schematic diagram for explaining the shuttle-in process. As shown in FIG. 9, in the shuttle-in process, the transfer cylinder 21 moves the transfer plate 20 on which the match plate 19 is placed to the molding position.

  Next, a frame setting process (S14) is performed. FIG. 10 is a schematic diagram for explaining the frame setting process. As shown in FIG. 10, in the frame setting process, the upper flask cylinder 16, the lower flask cylinder 18 (FIG. 2), the lower fill cylinder 42, and the squeeze cylinder 37 expand and contract in accordance with the thickness of the mold formed. . As a result, the upper flask 15 moves to a predetermined position, and the lower flask 17 abuts on the match plate 19, and thereafter, the lower flask 17 on which the match plate 19 is placed moves to a predetermined position. The match plate 19 is held between the frame 15 and the lower flask 17. Then, the second lower sand tank 31 and the lower filling frame 41 rise, and the lower filling frame 41 abuts on the lower flask 17. 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. It will be in the state which corresponds with the height of connection mouth 38. At this time, the upper molding space and the lower molding space are in the state (height) determined by the control device 50.

  Next, an aeration process (S16) is performed. FIG. 11 is a schematic view illustrating an aeration process. As shown in FIG. 11, 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 compressed air source and the electropneumatic proportional valve are in the upper sand tank 22 and the first lower sand tank 30. Supply compressed air. Thereby, while flowing mold sand, mold sand is filled in the upper molding space and the lower molding space. As one example, when the set pressure and time are satisfied, the aeration process ends.

  Next, squeeze processing (S18) is performed. FIG. 12 is a schematic diagram for explaining the squeeze process. As shown in FIG. 12, in the squeeze process, the sealing mechanism operated in the aeration process (S16) releases the seal, and the squeeze cylinder 37 further extends, whereby the second lower sand tank 31 further rises. Do. Thereby, the lower plate 40 attached to the second lower sand tank 31 enters the lower filling frame 41, compresses the mold sand in the lower molding space, and the upper plate 25 enters the upper flask 15. , Compress mold sand in the upper mold 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 processing ends. When the upper flask cylinder 16, the lower flask cylinder 18, and the lower fill cylinder 42 are controlled by a hydraulic circuit during the squeeze process, each cylinder is set to a free circuit. As a result, each cylinder loses its squeeze force and contracts.

  Next, the die-cutting process (S20) is performed. FIG. 13 is a schematic view for explaining the die-cutting process. As shown in FIG. 13, in the punching process, the lower filling frame cylinder 42 is contracted to lower the lower filling frame 41. Thereafter, the squeeze cylinder 37 contracts to lower the second lower sand tank 31, and subsequently lower the lower flask 17 on which the match plate 19 and the transfer plate 20 are placed. Then, a die is cast from the upper flask 15. When the lower flask 17 is lowered to the fixing portion (not shown), the match plate 19 and the transfer plate 20 are supported by the fixing portion. As a result, a die is cast from the lower flask 17.

  Next, a shuttle out process (S22) is performed. FIG. 14 is a schematic diagram for explaining the shuttle out process. As shown in FIG. 14, in the shuttle-out process, the transport plate 20 is moved to the retracted position by contraction of the transport cylinder 21. In the state shown in FIG. 14, the core is placed on the upper flask 15 or the lower flask 17 if necessary.

  Next, a framing process (S24) is performed. FIG. 15 is a schematic diagram for explaining the framing process. As shown in FIG. 15, in the frame alignment process, the lower flask cylinder 18 is contracted and the squeeze cylinder 37 is extended to raise the lower flask 17 and the second lower sand tank 31 to align the frames. .

  Next, a removal process (S26) is performed. FIG. 16 is a schematic view for explaining the removal process. As shown in FIG. 16, in the frame removal processing, the upper flask frame cylinder 16 and the lower flask frame cylinder 18 are contracted to raise the upper flask frame 15 and the lower flask frame 17 up to the rising end, thereby removing the flask frame. Do.

  Next, a first frame separation process (S28) is performed. FIG. 17 is a schematic diagram for explaining the first frame separation process (first half). As shown in FIG. 17, in the first frame separation process, the squeeze cylinder 37 contracts in a state where the mold is placed on the lower plate 40 of the second lower sand tank 31, and the second lower sand tank 31 is lowered. Let At this time, the lower flask cylinder 18 is extended, and the lower flask 17 is lowered and stopped at a position where it does not get in the way when carrying out the mold.

  Next, a mold extrusion process (S30) is performed. FIG. 18 is a schematic view illustrating a mold extrusion process. As shown in FIG. 18, in the mold extrusion process, the upper mold and the lower mold are carried out of the apparatus (for example, a molding line) by the extrusion cylinder 48 (see FIG. 2) being extended.

  Next, second frame separation processing (S32) is performed. FIG. 19 is a schematic diagram for explaining the second frame separation processing (second half). As shown in FIG. 19, in the second frame separation processing, the lower flask cylinder 18 is extended, and the lower flask 17 is returned to the original position.

  This is the end of the process of forming a pair of upper and lower molds.

[Hydraulic circuit]
The squeeze cylinder 37, the upper flask cylinder 16 and the lower filling cylinder 42 may be constituted by hydraulic cylinders. FIG. 20 shows a hydraulic circuit 60 of the frame forming machine 1 according to an embodiment. The hydraulic circuit 60 is connected to the hydraulic pump 61 and the oil tank 62, and includes a squeeze cylinder 37 which is a hydraulic actuator, an upper flask cylinder (upper flask hydraulic cylinder) 16 and a lower filling cylinder (lower fill cylinder hydraulic cylinder) 42. It is a circuit to drive. The hydraulic circuit 60 includes a squeeze solenoid valve 63, an upper flask electromagnetic valve 64, an upper flask free electromagnetic valve 65 and an upper flask counter balance valve 66, a lower fill frame electromagnetic valve 68, a lower fill frame free electromagnetic valve 69 and a lower deposit A frame counter balance valve 70 is provided. The hydraulic circuit 60 is not limited to the above embodiment. For example, a hydraulic circuit, a hydraulic pump, and an oil tank may be prepared for each of the squeeze cylinder 37, the upper flask cylinder 16 and the lower fill cylinder 42. Below, the hydraulic circuit for operating the squeeze cylinder 37 in the vertical direction is the squeeze hydraulic circuit 80, and the hydraulic circuit for operating the upper flask cylinder 16 in the vertical direction is the upper flask hydraulic circuit (first hydraulic circuit) 81 The hydraulic circuit for operating the lower filling cylinder 42 in the vertical direction is referred to as a lower filling hydraulic circuit (second hydraulic circuit) 83.

  The operation of the squeeze cylinder 37 is controlled by the squeeze hydraulic circuit 80. The squeeze hydraulic circuit 80 has a squeeze solenoid valve 63. The squeeze solenoid valve 63 is a valve that controls the direction of the oil flowing to the squeeze cylinder 37. The squeeze cylinder 37 has an internal space on the rod side (the side on which the piston rod of the cylinder is out) and an internal space on the non-rod side (the side on which the piston rod of the cylinder is not out). It is connected to the valve 63. The squeeze solenoid valve 63 causes the squeeze cylinder 37 to be output in the pulling direction by causing the oil to flow into the internal space on the rod side. The squeeze solenoid valve 63 causes the squeeze cylinder 37 to be output in the pushing direction by causing the oil to flow into the internal space on the non-rod side. Thus, the squeeze cylinder 37 is driven by the hydraulic pressure. The squeeze cylinder 37 and the squeeze hydraulic circuit 80 function as a drive unit that moves the lower plate 40 upward to perform squeeze processing.

  The operation of the upper flask cylinder 16 is controlled by the upper flask hydraulic circuit 81. The upper form hydraulic circuit 81 is a first back pressure that provides the upper form cylinder 16 with a first back pressure that resists the upward movement of the upper form 15 relative to the upper plate 25 during the squeeze processing of the drive unit. It has a circuit 82. The upward movement of the upper flask 15 with respect to the upper plate 25 means, for example, the movement of the upper flask 15 relative to the upper plate 25 so as to be relatively upward. More specifically, the upper flask hydraulic circuit 81 includes an upper flask electromagnetic valve 64, an upper flask free solenoid valve 65, and an upper flask counterbalance valve 66. The upper flask solenoid valve 64 is a solenoid valve that controls the direction of the oil flowing to the upper flask cylinder 16. The upper flask cylinder 16 has an inner space on the rod side and an inner space on the non-rod side, both of which are connected to the upper flask electromagnetic valve 64. The upper flask solenoid valve 64 causes the upper flask cylinder 16 to be output in the pulling direction by causing the oil to flow into the internal space on the rod side. The upper flask solenoid valve 64 causes the upper flask cylinder 16 to be output in the pushing direction by causing oil to flow into the internal space on the non-rod side. Thus, the upper flask cylinder 16 is driven by the hydraulic pressure.

  The upper flask-free solenoid valve 65 is a solenoid valve that makes oil flowing to the upper flask cylinder 16 free. By means of the upper flask-free electromagnetic valve 65, the upper flask cylinder 16 can switch between a state in which a force is applied to the upper flask 15 and a state in which no force is applied. The upper flask counterbalance valve 66 is a pressure control valve that adjusts the pressure of the oil freed by the upper flask free solenoid valve 65. The upper flask counterbalance valve 66 generates a resistance (first back pressure) when the upper flask cylinder 16 outputs in the pulling direction. That is, the back flask control of the first back pressure circuit 82 is realized by the upper flask counter balance valve 66. The upper flask counterbalance valve 66 may be an electromagnetic relief valve capable of controlling the pressure in proportion to the input voltage. By using the electromagnetic relief valve, the operator can adjust the pressure from the liquid crystal panel 67 or the like.

  The lower filling frame cylinder 42 is controlled in operation by the lower filling frame hydraulic circuit 83. The lower fill frame hydraulic circuit 83 is a second back pressure that gives the lower fill frame cylinder 42 a second back pressure that resists the downward movement of the lower fill frame 41 relative to the lower plate 40 during the squeeze processing of the drive unit. It has a circuit 84. The downward movement of the lower filling frame 41 with respect to the lower plate 40 means, for example, movement of the lower filling frame 41 so as to be lower relative to the lower plate 40. More specifically, the lower filling frame hydraulic circuit 83 includes a lower filling frame solenoid valve 68, a lower filling frame free solenoid valve 69, and a lower filling frame counterbalance valve 70. The lower fill frame solenoid valve 68 is a solenoid valve that controls the direction of the oil flowing to the lower fill frame cylinder 42. The lower filling cylinder 42 has an inner space on the rod side and an inner space on the non-rod side, both of which are connected to the lower filling frame electromagnetic valve 68. The lower fill frame electromagnetic valve 68 causes the lower fill frame cylinder 42 to be output in the pulling direction by causing the oil to flow into the internal space on the rod side. The lower filling frame electromagnetic valve 68 causes the lower filling frame cylinder 42 to be output in the pushing direction by causing the oil to flow into the internal space on the non-rod side. Thus, the lower filling frame cylinder 42 is driven by the hydraulic pressure.

  The lower filling frame free solenoid valve 69 is a solenoid valve that makes the oil flowing to the lower filling frame cylinder 42 free. The lower filling frame cylinder 42 can switch between a state in which a force is applied to the lower filling frame 41 and a state in which no force is applied by the lower filling frame free electromagnetic valve 69. The lower filling frame counter balance valve 70 is a pressure control valve that adjusts the pressure of the oil released by the lower filling frame free solenoid valve 69. The lower filling frame counterbalance valve 70 generates a resistance (second back pressure) when the lower filling frame cylinder 42 outputs in the pulling direction. That is, the backfill control of the second back pressure circuit 84 is realized by the lower fill frame counterbalance valve 70. The lower fill frame counterbalance valve 70 may be an electromagnetic relief valve capable of controlling the pressure in proportion to the input voltage. By using the electromagnetic relief valve, the operator can adjust the pressure from the liquid crystal panel 74 or the like.

  By having the above-described configuration, it is possible to perform squeeze force balance adjustment work. During the squeeze process, the squeeze cylinder 37 outputs the force in the pushing direction by the squeeze hydraulic circuit 80. At this time, if there is resistance, the squeeze force decreases, so that the upper flask-free cylinder 16 is freed by the upper flask-free electromagnetic valve 65 of the upper flask hydraulic circuit 81, and the lower flange free electromagnetic of the lower flange hydraulic circuit 83. The lower filling frame cylinder 42 is freed by the valve 69. Then, a squeeze force is generated between the upper plate 25 and the lower plate 40 in the vertical direction.

  Here, if the squeeze force applied to the upper mold is greater than the squeeze force applied to the lower mold, that is, if the force in the pushing direction of the squeeze cylinder 37 is strong, the first back pressure circuit of the upper form hydraulic circuit 81. At 82, the upper flask cylinder 16 may be provided with a first back pressure that resists the upward movement of the upper flask 15 relative to the upper plate 25. Similarly, if the squeeze force applied to the lower mold is greater than the squeeze force applied to the upper mold, that is, if the force in the pressing direction of the squeeze cylinder 37 is insufficient, the second back pressure of the lower fill frame hydraulic circuit 83 The circuit 84 may provide the lower filling frame cylinder 42 with a second back pressure that resists the downward movement of the lower filling frame 41 relative to the lower plate 40.

  As mentioned above, according to the frame forming machine 1 which concerns on this embodiment, the lower plate 40 moves upward by a drive part, and a squeeze process is performed. Then, the frame forming machine 1 generates the first back pressure or the second back pressure in the upper flask cylinder 16 or the lower fill cylinder 42 using the first back pressure circuit 82 and the second back pressure circuit 84. As a result, uniform pressure can be applied to the mold sand and as a result, excellent mold or cast products can be formed.

  Moreover, according to the frame forming machine 1 of the present embodiment, the balance of the squeeze force is controlled by the back pressure of the upper flask cylinder 16 or the lower fill cylinder 42 while keeping the force in the pushing direction of the squeeze cylinder 37 constant. You can also Thus, the control can be simplified by eliminating the need for the adjustment on the squeeze cylinder 37 side. Furthermore, the hydraulic pressure of the squeeze cylinder 37 is not turned ON (100%)-OFF (0%) and controlled to the target value as in the conventional extrusion molding machine, but it is set to an intermediate value such as 80% or 60%. Since the setting can be made, the rise time of the hydraulic pressure when turning on from OFF can be made unnecessary. Therefore, the lower plate 40 can be operated quickly to shorten the squeeze process, and as a result, the time per cycle of the molding process shown in FIG. 8 can be shortened. Furthermore, the followability to the target value can be improved as compared to the ON-OFF control.

  In addition, embodiment mentioned above shows an example of the frame-removal molding machine which concerns on this invention. The frame forming machine according to the present invention is not limited to the frame forming machine 1 according to the embodiment, and the frame forming machine 1 according to the embodiment may be modified without departing from the scope described in each claim. Or may be applied to other things.

[Modification 1]
In the embodiment described above, the squeeze cylinder 37 raises the lower plate 40 to generate the squeeze force, but the present invention is not limited to this. For example, it may be a frame forming machine that applies a squeeze force from both sides of the upper plate 25 and the lower plate 40 to squeeze. FIG. 21 is a schematic view for explaining the main part of a frame forming machine 1A according to a modification. The frame forming machine 1A shown in FIG. 21 is a forming machine for forming the upper mold and the lower mold of a non-foaming frame, and has a main part different from the frame forming machine 1. The frame forming machine 1A includes a pair of upper flask 15A and lower flask 17A. The upper flask 15A has a first opening 15a and a second opening 15b. The lower flask 17A has a fourth opening 17b capable of holding the match plate 19A between the third opening 17a and the second opening 15b of the upper flask 15A. The upper flask 15A and the lower flask 17A sandwich the match plate 19A. The frame-forming machine 1A includes a lower filling frame 41A having a fifth opening 41a and a sixth opening 41b connectable to the third opening 17a of the lower flask 17A.

  The upper plate 25A is arranged to be able to enter and exit from the first opening 15a of the upper flask 15A by the upper squeeze cylinder 80A. The lower plate 40A is arranged to be able to enter and exit from the fifth opening 41a of the lower filling frame 41A by the lower squeeze cylinder 37A. The punching frame cylinder 16A adjusts the positional relationship between the upper flask 15A and the upper plate 25A by adjusting the position of the upper plate 25A. The upper squeeze cylinder 80A moves the upper plate 25A in the direction approaching the match plate 19A, and the lower squeeze cylinder 37A moves the lower plate 40A in the direction approaching the match plate 19A. Thereby, the squeeze force can be applied from both sides of the upper flask 15A and the lower flask 17A to squeeze.

  In addition, in the removal frame molding machine 1A, it does not specifically limit about the filling method of mold sand. FIG. 22 shows a main part and a hydraulic circuit of a frame forming machine 1A according to a modification.

  As shown in FIG. 22, the main part of the frame making machine 1A is turned by 90 ° from the vertical direction around the pivoting part 100, so that the mold sand is filled. Incidentally, as shown in FIG. 22, the lower filling frame 41A may be fixed to the station side where the mold sand is filled.

  The hydraulic circuit of the frame making machine 1A will be described. The hydraulic circuit 60A is connected to the hydraulic pump 88 and the oil tank 89, and drives the lower squeeze cylinder 37A, the upper squeeze cylinder 80A, and the removal frame cylinder 16A, which are hydraulic actuators. The hydraulic circuit 60A includes a squeeze solenoid valve 90, a lower flask counterbalance valve 91, a removal frame solenoid valve 92, a removal frame free solenoid valve 93, and a removal frame counterbalance valve 94. The hydraulic circuit 60A is not limited to the above embodiment. For example, a hydraulic circuit, a hydraulic pump, and an oil tank may be prepared for each of the lower squeeze cylinder 37A, the upper squeeze cylinder 80A, and the removal frame cylinder 16A. In the following, the hydraulic circuit for operating the lower squeeze cylinder 37A and the upper squeeze cylinder 80A in the horizontal direction is squeeze hydraulic circuit 96, and the hydraulic circuit for operating the removal frame cylinder 16A in the horizontal direction is removed. Hydraulic circuit) 97.

  The operation of the lower squeeze cylinder 37A and the upper squeeze cylinder 80A is controlled by the squeeze hydraulic circuit 96. The squeeze hydraulic circuit 96 has a squeeze solenoid valve 90. The squeeze solenoid valve 90 is a valve that controls the direction of oil flowing to the lower squeeze cylinder 37A and the upper squeeze cylinder 80A. Each of the lower squeeze cylinder 37A and the upper squeeze cylinder 80A has an inner space on the rod side and an inner space on the non-rod side, and the respective spaces are connected to the squeeze solenoid valve 90. The squeeze solenoid valve 90 causes the lower squeeze cylinder 37A and the upper squeeze cylinder 80A to be output in the pulling direction by causing oil to flow into the internal space on the rod side. The squeeze solenoid valve 90 causes the lower squeeze cylinder 37A and the upper squeeze cylinder 80A to be output in the pushing direction by causing the oil to flow into the internal space on the non-rod side. Thus, the lower squeeze cylinder 37A and the upper squeeze cylinder 80A are driven by the hydraulic pressure. The lower squeeze cylinder 37A, the upper squeeze cylinder 80A, and the squeeze hydraulic circuit 96 function as a drive unit that moves the lower plate 40A and the upper plate 25A so as to approach each other and performs squeeze processing.

  The squeeze hydraulic circuit 96 provides the lower squeeze cylinder 37A with a second back pressure that resists movement of the lower squeeze cylinder 37A and the upper squeeze cylinder 80A toward the match plate 19A during the squeeze process A second back pressure circuit 98 is provided. More specifically, the second back pressure circuit 98 includes a lower flask counterbalance valve 91. The lower flask counterbalance valve 91 is a pressure control valve that adjusts the back pressure of the lower squeeze cylinder 37A. When the lower squeeze cylinder 37A outputs in the pushing direction, a resistance (second back pressure) is generated by the lower flask counterbalance valve 91. That is, back pressure control of the squeeze hydraulic circuit 96 is realized by the lower flask counter balance valve 91. The lower flask counterbalance valve 91 may be an electromagnetic relief valve capable of controlling the pressure in proportion to the input voltage. By using the electromagnetic relief valve, the operator can adjust the pressure from the liquid crystal panel 101 or the like.

  The operation of the removal frame cylinder 16A is controlled by the removal frame hydraulic circuit 97. The first frame back pressure circuit 99 provides the first frame back pressure to the frame cylinder 16A as a resistance to the movement of the upper plate 25A in the direction approaching the match plate 19A during the squeeze processing of the drive unit. Have. More specifically, the drawing frame hydraulic circuit 97 includes a drawing frame solenoid valve 92, a drawing frame free solenoid valve 93, and a drawing frame counterbalance valve 94. The removal frame solenoid valve 92 is a solenoid valve that controls the direction of the oil flowing to the removal frame cylinder 16A. The drawing frame cylinder 16A has an inner space on the rod side and an inner space on the non-rod side, and both are connected to the drawing frame solenoid valve 92. The drawing frame solenoid valve 92 causes the drawing frame cylinder 16A to output in the pulling direction by causing the oil to flow into the internal space on the rod side. The drawing frame solenoid valve 92 causes the drawing frame cylinder 16A to output in the pushing direction by causing the oil to flow into the internal space on the non-rod side. Thus, the removal frame cylinder 16A is driven by the hydraulic pressure.

  The removal frame free solenoid valve 93 is a solenoid valve that makes the oil flowing to the removal frame cylinder 16A free. By the drawing frame free electromagnetic valve 93, the drawing frame cylinder 16A can switch between the state in which a force is applied to the upper plate 25A and the state in which no force is applied. The removal frame counterbalance valve 94 is a pressure control valve that adjusts the pressure of the oil released by the removal frame free solenoid valve 93. When the upper plate 25A approaches the match plate 19A, a resistance (first back pressure) is generated by the removal frame counterbalance valve 94. That is, the removal frame counter balance valve 94 realizes back pressure control of the first back pressure circuit 99. The removal frame counterbalance valve 94 may be an electromagnetic relief valve capable of controlling the pressure in proportion to the input voltage. By using the electromagnetic relief valve, the operator can adjust the pressure from the liquid crystal panel 95 or the like.

  By having the above-described configuration, it is possible to perform squeeze force balance adjustment work. During the squeeze process, the lower squeeze cylinder 37A and the upper squeeze cylinder 80A output the force in the pushing direction by the squeeze hydraulic circuit 96. Thereby, a squeeze force is generated between the upper plate 25A and the lower plate 40A.

  Here, when the squeeze force in the direction in which the lower plate 40A approaches the match plate 19A is larger than the squeeze force in the direction in which the upper plate 25A approaches the match plate 19A, that is, the force in the pushing direction of the lower squeeze cylinder 37A is strong In this case, the second back pressure circuit 98 of the squeeze hydraulic circuit 96 causes the second squeeze cylinder 37A to resist the movement of the lower plate 40A in the direction in which the lower plate 40A approaches the match plate 19A. Just give it. Similarly, when the squeezing force in the direction in which the upper plate 25A approaches the match plate 19A is larger than the squeezing force in the direction in which the lower plate 40A approaches the match plate 19A, that is, the force in the pushing direction of the upper squeeze cylinder 80A is strong In this case, by the first back pressure circuit 99 of the drawing frame hydraulic circuit 97, the first back pressure that is a resistance to the movement of the upper plate 25A in the direction in which the upper plate 25A approaches the match plate 19A is drawn the drawing cylinder 16A. It should be given to As described above, the frame forming machine 1A according to the modification can apply uniform pressure to mold sand similarly to the frame forming machine 1, and as a result can form an excellent mold or a cast product. . In addition, the extrusion molding machine 1A according to the modification can simplify the control as well as the extrusion molding machine 1, and improve the followability to the target value compared to the ON-OFF control. it can.

  Moreover, according to the frame forming machine 1A which concerns on a modification, the structure which performs sanding in the state rotated 90 degree is employable. In the case of a conventional extrusion molding machine, when the external force is changed by the two squeeze means in such a state, peristalsis occurs. Thereby, there is a possibility that a gap between the lower plate 40A and the core (axis) of the lower flask 17 may occur. In this case, there is a risk that the seal on the outer periphery of the lower plate 40A and the urethane (the function of protecting the molding frame from sand) portion on the inner surface of the lower molding frame 17 may be worn away. On the other hand, according to the frame drawing molding machine 1A which concerns on a modification, both squeeze force can be adjusted so that generation | occurrence | production of a peristalsis may be suppressed as much as possible. For this reason, it is possible not only to form an excellent mold or cast product but also to suppress the consumption of consumables.

[Modification 2]
Although the squeeze cylinder 37 raises the lower plate 40 to generate the squeeze force in the frame forming machine 1 according to the embodiment described above, the present invention is not limited to this. For example, it may be a frame forming machine that applies a squeeze force only from the upper plate 25 to squeeze. Moreover, also in the frame forming machine 1A according to the first modification, the frame forming machine may perform the squeeze by applying the squeeze force only from the upper plate 25A, or may apply the squeeze force from only the lower plate 40A. It may be a frame forming machine that squeezes. That is, the present invention is not limited to the direction of the squeeze. Further, according to the present invention, a back pressure circuit (resistance force generating mechanism) for applying a resistance force that resists the squeeze force may be provided in the hydraulic circuit of the squeeze cylinder, or provided in the hydraulic circuit of another actuator. It is also good. Another actuator is, for example, a cylinder that moves either the upper flask, the lower flask, or the lower fill frame in the squeeze direction.

  1, 1A: extrusion frame molding machine, 12: guide, 15: upper frame, 16: upper frame cylinder (upper frame hydraulic cylinder), 16A: frame cylinder, 17: lower frame, 18: lower frame Cylinder 19 19 match plate 22 upper sand tank 25 25A upper plate 22a 30a transparent member 30 first lower sand tank 31 lower lower sand tank 32 lower tank cylinder 35 ... 1st connection port, 36 ... 1st closing plate, 37 ... squeeze cylinder, 37A ... lower squeeze cylinder, 38 ... 2nd connection port, 39 ... 2nd closing plate, 40, 40A ... lower plate, 41 ... lower filling frame , 42: lower fill frame cylinder (lower fill frame hydraulic cylinder), 50: control device, 60, 60A: hydraulic circuit, 66: upper flask counterbalance valve, 70: lower fill frame counterbalance valve, 80A: upper squeeze cylinder , 2,99 ... first back pressure circuit, 84 and 98 ... second back pressure circuit, 91 ... drag flask counterbalance valve, 94 ... covering frame counterbalance valve.

Claims (7)

A frame-forming machine for forming upper and lower molds of a casting-free frame, comprising
Upper frame,
A lower flask which is disposed below the upper flask and is capable of holding the match plate together with the upper flask;
A lower flask drive unit for moving the lower flask in the vertical direction;
A lower filling frame disposed below the lower flask and having an upper opening connectable to a lower opening of the lower flask;
An upper plate capable of entering and exiting the upper opening of the upper flask;
A lower plate capable of entering and exiting the lower opening of the lower filling frame;
An upper form hydraulic cylinder connected to the upper form;
A first hydraulic circuit for moving the upper form hydraulic cylinder in the vertical direction;
A lower filling frame hydraulic cylinder connected to the lower filling frame;
A second hydraulic circuit for moving the lower fill frame hydraulic cylinder up and down;
A driving unit that moves the lower plate upward to perform squeeze processing;
Equipped with
The first hydraulic circuit applies a first back pressure to the upper flask hydraulic cylinder, the first back pressure resisting the upward movement of the upper flask relative to the upper plate during the squeeze processing of the drive unit. Have a pressure circuit,
The second hydraulic circuit applies a second back pressure to the lower fill frame hydraulic cylinder, which is a resistance to the downward movement of the lower fill frame with respect to the lower plate during the squeeze processing of the drive unit. It has a voltage divider,
The first back pressure circuit and the second back pressure circuit use the first back pressure and the second back pressure to adjust the balance between the squeezing force applied to the upper mold and the squeezing force applied to the lower mold. Do ,
Extrusion machine molding machine.   The shed frame molding machine according to claim 1, wherein the first back pressure circuit and the second back pressure circuit include a counterbalance valve.   The frame forming machine according to claim 2, wherein the counterbalance valve is an electromagnetic relief valve capable of controlling pressure in proportion to an input voltage. A frame-forming machine for forming upper and lower molds of a casting-free frame, comprising
An upper flask having a first opening and a second opening;
A lower molding frame having a third opening and a fourth opening capable of holding a match plate between the second molding and the second opening of the upper molding;
A lower filling frame having a fifth opening, and a sixth opening connectable to the third opening of the lower flask;
An upper plate capable of entering and exiting the first opening of the upper flask;
A lower plate capable of entering and exiting the fifth opening of the lower filling frame;
A drawing frame cylinder for adjusting a positional relationship between the upper molding frame and the upper plate;
A first hydraulic circuit for driving the removal frame cylinder;
An upper squeeze cylinder for moving the upper plate;
A lower squeeze cylinder for moving the lower plate;
A squeeze hydraulic circuit for driving the upper squeeze cylinder and the lower squeeze cylinder;
Equipped with
The first hydraulic circuit is configured to apply a first back pressure, which is a resistance to movement of the upper plate in the direction approaching the match plate during the squeeze processing of the upper squeeze cylinder and the lower squeeze cylinder, to the drawing frame cylinder. Have a first back pressure circuit to provide
The squeeze hydraulic circuit applies a second back pressure to the lower squeeze cylinder that resists movement of the lower plate toward the match plate during squeeze processing of the upper squeeze cylinder and the lower squeeze cylinder. have a second back pressure circuit,
The first back pressure circuit and the second back pressure circuit use the first back pressure and the second back pressure to adjust the balance between the squeezing force applied to the upper mold and the squeezing force applied to the lower mold. Do ,
Extrusion machine molding machine. A frame-forming machine for forming upper and lower molds of a casting-free frame, comprising
An upper plate which forms a molding space together with the match plate and the upper flask;
A lower plate which forms a lower molding space together with the match plate and the lower flask;
A squeeze cylinder for applying a squeeze force to the sand filled in the upper molding space and the lower molding space;
A hydraulic circuit for driving the squeeze cylinder;
A first back pressure circuit that provides a first back pressure that resists movement in a direction in which the upper plate and the match plate approach during squeeze processing by the squeeze cylinder;
A second back pressure circuit providing a second back pressure that resists movement in a direction in which the lower plate and the match plate approach during the squeeze processing by the squeeze cylinder;
Equipped with
The first back pressure circuit and the second back pressure circuit use the first back pressure and the second back pressure to adjust the balance between the squeezing force applied to the upper mold and the squeezing force applied to the lower mold. Do ,
Extrusion machine molding machine. A frame-forming machine for forming upper and lower molds of a casting-free frame, comprising
A pair of upper and lower flasks,
A squeeze cylinder that performs squeeze processing to press mold sand filled in the upper and lower flasks with a predetermined squeeze force;
A resistance generating mechanism that applies resistance to the squeeze force during squeeze processing by the squeeze cylinder;
Equipped with
The resistance force generation mechanism adjusts the balance between the squeeze force applied to the upper mold and the squeeze force applied to the lower mold using the resistance force.
Extrusion machine molding machine. A frame-forming machine for forming upper and lower molds of a casting-free frame, comprising
A pair of upper and lower flasks,
A lower filling frame connected to the lower forming frame,
A squeeze cylinder for performing a squeeze process in which mold sand filled in the upper flask, the lower flask, and the lower fill frame is pressurized with a predetermined squeeze force;
A first hydraulic circuit for driving the squeeze cylinder;
A cylinder for moving any one of the upper flask, the lower flask, or the lower fill frame in the squeeze direction;
A second hydraulic circuit that drives the cylinder and provides a back pressure that resists the squeeze force of the squeeze cylinder;
Equipped with
The second hydraulic circuit adjusts the balance between the squeeze force applied to the upper mold and the squeeze force applied to the lower mold using the back pressure .
Extrusion machine molding machine.

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