EP1952912A1 - Molding machine and molding method - Google Patents
Molding machine and molding method Download PDFInfo
- Publication number
- EP1952912A1 EP1952912A1 EP07013122A EP07013122A EP1952912A1 EP 1952912 A1 EP1952912 A1 EP 1952912A1 EP 07013122 A EP07013122 A EP 07013122A EP 07013122 A EP07013122 A EP 07013122A EP 1952912 A1 EP1952912 A1 EP 1952912A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- flask
- match plate
- cope
- molding
- drag
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000465 moulding Methods 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000003110 molding sand Substances 0.000 claims abstract description 14
- 230000007547 defect Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C11/00—Moulding machines characterised by the relative arrangement of the parts of same
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
- B22C15/02—Compacting by pressing devices only
- B22C15/08—Compacting by pressing devices only involving pneumatic or hydraulic mechanisms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C21/00—Flasks; Accessories therefor
- B22C21/02—Sectional flasks, i.e. with divided, articulated, or interchangeable side sections
Definitions
- This invention relates to a molding machine and molding method, and, more particularly, it relates to a match-plate molding machine and a molding method using a match plate.
- WO2005/058528 A1 One example of conventional match plate molding machines for molding upper and lower molds at the same time is disclosed in WO2005/058528 A1 .
- this molding machine first, a match plate is sandwiched and held between a cope flask and a drag flask. Upper and lower squeeze members are then inserted into the respective flasks through their openings opposed to the match plate such that upper and lower molding spaces are defined. The defined molding spaces are then filled with molding sand. The upper and lower squeeze members are then moved to the match plate to squeeze the molding sand within the molding spaces to mold upper and lower molds. The cope and drag flasks, which contain the corresponding upper and lower molds, are then removed from the match plate. These removing procedures are achieved with cylinders that reciprocatingly move the cope and drag flasks relative to the match plate.
- the inconvenience of such a conventional molding machine is that the procedures for removing the cope and drag flasks from the match plate start when the match plate adheres to either the upper mold or the lower mold. That is, if the match plate adheres to either mold, first, the other mold (i.e., the mold that doesn't adhere to the match plate) and the corresponding flask that contains the other mold, are removed (i.e., stripped) from the match plate in unison (the first stripping). Then one mold (i.e., the mold that adheres to the match plate), and the corresponding flask that contains that one mold, are then removed from the match plate in unison (the second stripping). The first stripping is to be begun when the other mold is stationary.
- the second stripping should, however, be done when the moving match plate, which is moved immediately just before this point, is stopped, while the mold (the one mold) that is adhered to the match plate is still moving. Because of this, the one mold may receive a significant impact when it is removed from the match plate. Thus the second stripping may cause a defect.
- one object of the present invention is to provide a molding machine and molding method that prevent any defect in a mold that is adhered to a match plate when it, and the corresponding flask that contains the mold, are removed from the match plate.
- a molding method includes the steps of: holding a match plate between a cope flask and a drag flask; inserting an upper squeeze member and a lower squeeze member into the opening of the cope and drag flasks opposed to the match plate to define an upper molding space and a lower molding space, respectively; filling the defined molding space with molding sand; and driving the upper and lower squeeze members toward the match plate to squeeze the molding sand within the upper and lower molding space to mold an upper mold and a lower mold at the same time.
- the method is characterized in that it further comprises the step of: forcibly pushing away the cope and drag flasks that contain the molded upper and lower molds from the match plate at the same time when the flasks are stationary.
- the velocity at which the cope flask is separated from the drag flask is twice that when the match plate is separated from the drag flask, and preferably the velocity at which the cope flask is separated from the match plate is the same as that when the drag flask is separated from the match plate.
- a match-plate molding machine in another aspect of the present invention, includes: a cope flask and a drag flask; a match plate to be held between them; an upper squeeze member and a lower squeeze member that are insertable into openings of the cope and drag flasks, and which are opposed to the match plate; means for filling molding sand within an upper molding space that is defined by the cope flask, the match plate, and the upper squeeze member, and a lower molding space that is defined by the drag flask, the match plate, and the lower squeeze member; and driving means for driving the upper and lower squeeze members toward the match plate to squeeze the molding sand within the upper and lower molding spaces to mold an upper mold and a lower mold at the same time.
- the molding machine is characterized in that it further comprises: upper and lower pushing means for forcibly pushing away the cope and drag flasks that contain the molded upper and lower molds from the match plate when the flasks are stationary, wherein the upper pushing means and the lower pushing means are mounted on both the cope flask and the drag flask.
- the upper pushing means is a hydraulic cylinder that is extended by oil therein.
- the lower pushing means is a hydraulic cylinder that has less force to supply the oil that was forced inside the cylinder than that of the upper pushing means, or is an air cylinder that is extended by the compressed air, or is an elastic means that is extended by an elastic member.
- the cope and drag flasks have sand-filling ports on their sidewalls for filling sand.
- the drag flask is mounted on a rotating frame, which is rotated downwardly and upwardly in a vertical plane.
- the cope flask is mounted on the rotating frame such that the cope flask can approach and retract from the drag flasks.
- the molding machine may further comprise a shuttle for carrying in and carrying out the match plate between the cope and drag flasks. Also, it may further comprise a mechanism for the match plate to approach and retract from the drag flask.
- the molds from the match-plate molding machine of the present invention may to be tight-flask molds or flaskless molds.
- Fig. 4 schematically illustrates an alternative embodiment of the hydraulic power unit.
- the molding machine of the present invention includes a rotating frame 2, which is extended substantially vertically.
- the rotating frame 2 is pivotally mounted on a supporting shaft 1 such that it can be moved up and down in the vertical plane about the supporting shaft 1.
- a drag flask 4 whose sidewall has sand-filling ports, is mounted on the lower end of the rotating frame 2 via a supporting member 3.
- a match plate 7 is slidably and vertically mounted via guide holders 6.
- a cope flask whose sidewall has sand-filling ports, is slidably and vertically mounted via guide holders 8. Attached to the left side of the rotating frame 2 is the distal end of a piston rod of a downwardly facing, vertical cylinder 10.
- the match plate 7 can be carried in and carried out between the cope flask 9 and the drag flask 4 by any well-known shuttle (not shown).
- the match plate 7 can be moved to approach and retract from the drag flask 4 by an upwardly-facing cylinder (not shown) that is mounted on the rotating frame 2, as it is extended and contracted.
- the cope flask 9 is mounted on a cylinder 10 such that it is moved upward and downward by extending and contracting operation of the cylinder 10 to approach and retract from the match plate 7.
- Mounted near the four corners of the outer periphery of the cope flask 9 are four downwardly facing hydraulic cylinders (upper pushing means) 11 for pushing away the cope flask 9 from the match plate 7.
- mounted near the four corners of the outer periphery of the drag flask 4 are four, upwardly facing, air cylinders (lower pushing means) 12 for pushing away the drag flask 4 from the match plate 7.
- the molding machine is provided with a pressurizing fluidic unit 13 that supplies oil to the four hydraulic cylinders 11 and compressed air to the four air cylinders 12.
- the pressurizing fluidic unit 13 includes a hydraulic unit 14 having a hydraulic pump for generating the oil and a compressor 15 for generating the compressed air.
- the hydraulic pump of the hydraulic unit 14 is connected to an upper port and a lower port of a downwardly facing, hydraulic cylinder 16 through a directional control valve 17 and a shut-off valve 18.
- a pusher plate 19 On the lower end of the piston rod of the hydraulic cylinder 16, a pusher plate 19 is fixed. Below the pusher plate 19, four hydraulic pushers 21, for extruding and supplying the oil to respective upper ports of the four hydraulic cylinders 11 through four pipes 20, are provided such that their upper ends abut the pusher plate 19.
- Each of the hydraulic pushers 21 comprises an upwardly facing, hydraulic cylinder structure.
- the four pipes 20 are connected to the hydraulic pump of the hydraulic unit 14 through four respective shut-off valves 22.
- the respective lower ports of the four hydraulic cylinders 11 are connected to the hydraulic unit 14 through the directional control valve 17.
- the four air cylinders 12 are connected to the compressor 15 through a directional control valve 23.
- the match plate 7 is sandwiched and held between the cope flask 9 and the drag flask 4 at a molding station (not shown).
- Upper and lower squeeze members (not shown) are then inserted into the corresponding openings, which are opposed to the match plate 7, of the cope flask 9 and the drag flask 4, to define upper and lower molding spaces.
- the cope flask 9, the drag flask 4, the match plate 7, and their associated elements defining the molding space are then turned to their vertical positions or horizontal positions such that molding sand is blown and filled within the molding spaces through the sand-filling ports of the cope and drag flasks 9 and 4.
- the upper and lower squeeze members are then drivingly moved to the match plate 7 to squeeze the molding sand within the upper and lower molding spaces to make an upper mold and a lower mold at the same time.
- the molding machine is in the state shown in Figs. 1 and 2 .
- shut-off valve 18 is preliminarily opened to supply the oil to the lower port of the cylinder 16 and the upper ports of the four hydraulic pushers 21 to contract the cylinder 16 and to extend the four hydraulic pushers 21.
- the shut-off valve 18 is then closed and the four shut-off valves 22 are opened to supply the oil from the hydraulic pump of the hydraulic unit 14 to the four pipes 20, and the lower ports of the four hydraulic pushers 21.
- the oil from the hydraulic pump is also supplied to the upper ports of the four hydraulic cylinders 11 to contract them.
- the four shut-off valves 22, which are located between the four pipes 20 and the hydraulic unit 14, are then shut off.
- the cylinder 10 is extended to raise the cope flask 9, while another cylinder (not shown) is contracted to raise the match plate 7.
- the velocity of the cope flask 9 when it rises is preferably twice that of the match plate 7.
- the directional control valve 17 is then turned to extend the cylinder 16 to contract the four hydraulic pushers 21 through the pusher plate 19 to supply the oil to the upper ports of the four hydraulic cylinders 11 to extend them.
- the directional control valve 23 is turned to supply the compressed air from the compressor 15 to the four air cylinders 12 to extend them. Therefore, the four hydraulic cylinders 11 push down the match plate 7, while the four air cylinders 12 are simultaneously pushed up to the match plate 7.
- the match-plate molding machine for which the present invention can be applied are not limited to those described and shown herein.
- the match plate, the cope flask, and the drag flask may rotate after the match plate is held between the cope and drag flasks.
- the match plate may be held between the cope flask and the drag flask after the flasks are rotated. Therefore, the timing of holding the match plate and rotating the flasks does not limit the present invention.
- the resulting upper and lower molds that are made by the molding machine and molding method of the present invention may be tight-flask molds or flaskless molds.
- the hydraulic power unit 13 of the molding machine of the present invention is not limited to its embodiment shown in Fig. 3 .
- the hydraulic power unit 13 of Fig. 3 may be replaced with, e.g., the alternative hydraulic power unit 13A of Fig. 4 .
- the alternative hydraulic power unit 13A of Fig. 4 differs from the foregoing hydraulic power unit 13 of Fig. 3 in that the hydraulic cylinder 16 and the shut-off valve 18 are eliminated, while the upper ports of the hydraulic pushers 21 are connected to the directional control valve 17. Because the other elements of the alternative hydraulic power unit 13A of Fig. 4 are the same as those that are denoted by the same numbers of the hydraulic power unit 13 of Fig. 3 , their explanations are omitted.
- the molding machine makes the upper and lower molds at the same time, in the same manner as in the foregoing embodiment.
- the molding machine is thus in the state shown in Figs. 1 and 2 .
- the four shut-off valves are then opened to supply the oil to the four pipes 20 and the lower ports of the four hydraulic pushers 21.
- the oil is also supplied to the upper ports of the four cylinders 11, to contract them.
- the four shut-off valves are then closed to shut off the fluid communication between the four pipes 20 and the hydraulic unit 14.
- the cylinder 10 is then extended to raise the cope flask, while the other cylinder (not shown) is contracted to raise the match plate 7.
- the velocity of the cope flask 9 when it rises is preferably twice that of the match plate 7.
- the directional control valve 17 is then turned to contract the hydraulic pushers 21 through the pusher plate 19 to supply the oil to the upper ports of the four hydraulic cylinders 11, to extend them.
- the directional control valve 23 is turned to supply the compressed air from the compressor 15 to the four air cylinders 12 to extend them. Therefore, the four hydraulic cylinders 11 push down the match plate 7, while the four air cylinders 12 push up the match plate 7.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Devices For Molds (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
Description
- This invention relates to a molding machine and molding method, and, more particularly, it relates to a match-plate molding machine and a molding method using a match plate.
- One example of conventional match plate molding machines for molding upper and lower molds at the same time is disclosed in
WO2005/058528 A1 . In this molding machine, first, a match plate is sandwiched and held between a cope flask and a drag flask. Upper and lower squeeze members are then inserted into the respective flasks through their openings opposed to the match plate such that upper and lower molding spaces are defined. The defined molding spaces are then filled with molding sand. The upper and lower squeeze members are then moved to the match plate to squeeze the molding sand within the molding spaces to mold upper and lower molds. The cope and drag flasks, which contain the corresponding upper and lower molds, are then removed from the match plate. These removing procedures are achieved with cylinders that reciprocatingly move the cope and drag flasks relative to the match plate. - The inconvenience of such a conventional molding machine is that the procedures for removing the cope and drag flasks from the match plate start when the match plate adheres to either the upper mold or the lower mold. That is, if the match plate adheres to either mold, first, the other mold (i.e., the mold that doesn't adhere to the match plate) and the corresponding flask that contains the other mold, are removed (i.e., stripped) from the match plate in unison (the first stripping). Then one mold (i.e., the mold that adheres to the match plate), and the corresponding flask that contains that one mold, are then removed from the match plate in unison (the second stripping). The first stripping is to be begun when the other mold is stationary. The second stripping should, however, be done when the moving match plate, which is moved immediately just before this point, is stopped, while the mold (the one mold) that is adhered to the match plate is still moving. Because of this, the one mold may receive a significant impact when it is removed from the match plate. Thus the second stripping may cause a defect.
- Accordingly, one object of the present invention is to provide a molding machine and molding method that prevent any defect in a mold that is adhered to a match plate when it, and the corresponding flask that contains the mold, are removed from the match plate.
- In one aspect of the present invention, a molding method is provided. The method includes the steps of: holding a match plate between a cope flask and a drag flask; inserting an upper squeeze member and a lower squeeze member into the opening of the cope and drag flasks opposed to the match plate to define an upper molding space and a lower molding space, respectively; filling the defined molding space with molding sand; and driving the upper and lower squeeze members toward the match plate to squeeze the molding sand within the upper and lower molding space to mold an upper mold and a lower mold at the same time.
- The method is characterized in that it further comprises the step of: forcibly pushing away the cope and drag flasks that contain the molded upper and lower molds from the match plate at the same time when the flasks are stationary.
- Preferably, the velocity at which the cope flask is separated from the drag flask is twice that when the match plate is separated from the drag flask, and preferably the velocity at which the cope flask is separated from the match plate is the same as that when the drag flask is separated from the match plate.
- In another aspect of the present invention, a match-plate molding machine is provided. It includes: a cope flask and a drag flask; a match plate to be held between them; an upper squeeze member and a lower squeeze member that are insertable into openings of the cope and drag flasks, and which are opposed to the match plate; means for filling molding sand within an upper molding space that is defined by the cope flask, the match plate, and the upper squeeze member, and a lower molding space that is defined by the drag flask, the match plate, and the lower squeeze member; and driving means for driving the upper and lower squeeze members toward the match plate to squeeze the molding sand within the upper and lower molding spaces to mold an upper mold and a lower mold at the same time.
- The molding machine is characterized in that it further comprises: upper and lower pushing means for forcibly pushing away the cope and drag flasks that contain the molded upper and lower molds from the match plate when the flasks are stationary, wherein the upper pushing means and the lower pushing means are mounted on both the cope flask and the drag flask.
- Preferably, the upper pushing means is a hydraulic cylinder that is extended by oil therein. The lower pushing means is a hydraulic cylinder that has less force to supply the oil that was forced inside the cylinder than that of the upper pushing means, or is an air cylinder that is extended by the compressed air, or is an elastic means that is extended by an elastic member.
- In one embodiment of the present invention, the cope and drag flasks have sand-filling ports on their sidewalls for filling sand.
- Preferably, the drag flask is mounted on a rotating frame, which is rotated downwardly and upwardly in a vertical plane. The cope flask is mounted on the rotating frame such that the cope flask can approach and retract from the drag flasks.
- The molding machine may further comprise a shuttle for carrying in and carrying out the match plate between the cope and drag flasks. Also, it may further comprise a mechanism for the match plate to approach and retract from the drag flask.
- The molds from the match-plate molding machine of the present invention may to be tight-flask molds or flaskless molds.
- The foregoing and other purposes and advantages of the present invention are further clarified by the following descriptions, which refer to the accompanying drawings, in which:
-
Fig. 1 is a front view schematically illustrating a molding machine of the present invention; -
Fig. 2 is a schematic left view of the molding machine ofFig. 1 ; and -
Fig. 3 schematically illustrates a pressurizing fluidic unit that drives the molding machine ofFigs. 1 and2 . -
Fig. 4 schematically illustrates an alternative embodiment of the hydraulic power unit. - One embodiment of the match-plate molding machine of the present invention will now be explained in detail by reference to
Figs. 1 ,2 , and3 . As shown inFigs. 1 and2 , the molding machine of the present invention includes a rotatingframe 2, which is extended substantially vertically. The rotatingframe 2 is pivotally mounted on a supporting shaft 1 such that it can be moved up and down in the vertical plane about the supporting shaft 1. Adrag flask 4, whose sidewall has sand-filling ports, is mounted on the lower end of the rotatingframe 2 via a supportingmember 3. On the left side of the rotatingframe 2, a pair ofguide rods 5 is attached at a predetermined interval therebetween in back and front such that they extend substantially vertically. On theguide rods 5, amatch plate 7 is slidably and vertically mounted viaguide holders 6. Immediately above theguide holders 6 of theguide rods 5, a cope flask, whose sidewall has sand-filling ports, is slidably and vertically mounted viaguide holders 8. Attached to the left side of the rotatingframe 2 is the distal end of a piston rod of a downwardly facing,vertical cylinder 10. - The
match plate 7 can be carried in and carried out between thecope flask 9 and thedrag flask 4 by any well-known shuttle (not shown). Thematch plate 7 can be moved to approach and retract from thedrag flask 4 by an upwardly-facing cylinder (not shown) that is mounted on therotating frame 2, as it is extended and contracted. - The
cope flask 9 is mounted on acylinder 10 such that it is moved upward and downward by extending and contracting operation of thecylinder 10 to approach and retract from thematch plate 7. Mounted near the four corners of the outer periphery of thecope flask 9 are four downwardly facing hydraulic cylinders (upper pushing means) 11 for pushing away thecope flask 9 from thematch plate 7. Similarly, mounted near the four corners of the outer periphery of thedrag flask 4 are four, upwardly facing, air cylinders (lower pushing means) 12 for pushing away thedrag flask 4 from thematch plate 7. - As in
Fig. 3 , the molding machine is provided with a pressurizingfluidic unit 13 that supplies oil to the fourhydraulic cylinders 11 and compressed air to the fourair cylinders 12. The pressurizingfluidic unit 13 includes ahydraulic unit 14 having a hydraulic pump for generating the oil and acompressor 15 for generating the compressed air. The hydraulic pump of thehydraulic unit 14 is connected to an upper port and a lower port of a downwardly facing,hydraulic cylinder 16 through adirectional control valve 17 and a shut-offvalve 18. - On the lower end of the piston rod of the
hydraulic cylinder 16, apusher plate 19 is fixed. Below thepusher plate 19, fourhydraulic pushers 21, for extruding and supplying the oil to respective upper ports of the fourhydraulic cylinders 11 through fourpipes 20, are provided such that their upper ends abut thepusher plate 19. Each of thehydraulic pushers 21 comprises an upwardly facing, hydraulic cylinder structure. The fourpipes 20 are connected to the hydraulic pump of thehydraulic unit 14 through four respective shut-offvalves 22. The respective lower ports of the fourhydraulic cylinders 11 are connected to thehydraulic unit 14 through thedirectional control valve 17. The fourair cylinders 12 are connected to thecompressor 15 through adirectional control valve 23. - With the foregoing molding machine, prior to the machinery state shown in
Figs. 1 and2 , thematch plate 7 is sandwiched and held between thecope flask 9 and thedrag flask 4 at a molding station (not shown). Upper and lower squeeze members (not shown) are then inserted into the corresponding openings, which are opposed to thematch plate 7, of thecope flask 9 and thedrag flask 4, to define upper and lower molding spaces. The copeflask 9, thedrag flask 4, thematch plate 7, and their associated elements defining the molding space are then turned to their vertical positions or horizontal positions such that molding sand is blown and filled within the molding spaces through the sand-filling ports of the cope anddrag flasks match plate 7 to squeeze the molding sand within the upper and lower molding spaces to make an upper mold and a lower mold at the same time. As a result, the molding machine is in the state shown inFigs. 1 and2 . - At the same time, the shut-off
valve 18 is preliminarily opened to supply the oil to the lower port of thecylinder 16 and the upper ports of the fourhydraulic pushers 21 to contract thecylinder 16 and to extend the fourhydraulic pushers 21. The shut-offvalve 18 is then closed and the four shut-offvalves 22 are opened to supply the oil from the hydraulic pump of thehydraulic unit 14 to the fourpipes 20, and the lower ports of the fourhydraulic pushers 21. The oil from the hydraulic pump is also supplied to the upper ports of the fourhydraulic cylinders 11 to contract them. The four shut-offvalves 22, which are located between the fourpipes 20 and thehydraulic unit 14, are then shut off. - From the state shown in
Figs. 1 and2 , thecylinder 10 is extended to raise the copeflask 9, while another cylinder (not shown) is contracted to raise thematch plate 7. In this case, the velocity of the copeflask 9 when it rises is preferably twice that of thematch plate 7. Thedirectional control valve 17 is then turned to extend thecylinder 16 to contract the fourhydraulic pushers 21 through thepusher plate 19 to supply the oil to the upper ports of the fourhydraulic cylinders 11 to extend them. At the same time, thedirectional control valve 23 is turned to supply the compressed air from thecompressor 15 to the fourair cylinders 12 to extend them. Therefore, the fourhydraulic cylinders 11 push down thematch plate 7, while the fourair cylinders 12 are simultaneously pushed up to thematch plate 7. This causes the cope anddrag flasks match plate 7 and each other. In contrast to the conventional two-step stripping, the copeflask 9 and thedrag flask 4 are thus stripping at the same time. Therefore, this prevents an undesirable impact that may cause a defect in a mold that is involved in the conventional second stripping (stripping one flask from the match plate on which a mold that is contained within the flask is adhered). - In this case, setting the velocity of the cope
flask 9 when it is rising to twice that of thematch plate 7 results in there being a sufficient space in which the cope anddrag flasks match plate 7 and each other, in the following step. - While the molding machine and molding method of the present invention have been described with respect to the preferred embodiment, it is to be understood that the invention is intended to cover all of the various modifications and variations that can be included within the spirit and scope of the appended claims. Accordingly, the arrangements and operations of the match-plate molding machine for which the present invention can be applied are not limited to those described and shown herein. For example, the match plate, the cope flask, and the drag flask may rotate after the match plate is held between the cope and drag flasks. Alternatively, the match plate may be held between the cope flask and the drag flask after the flasks are rotated. Therefore, the timing of holding the match plate and rotating the flasks does not limit the present invention. The resulting upper and lower molds that are made by the molding machine and molding method of the present invention may be tight-flask molds or flaskless molds.
- Further, the
hydraulic power unit 13 of the molding machine of the present invention is not limited to its embodiment shown inFig. 3 . Thehydraulic power unit 13 ofFig. 3 may be replaced with, e.g., the alternativehydraulic power unit 13A ofFig. 4 . The alternativehydraulic power unit 13A ofFig. 4 differs from the foregoinghydraulic power unit 13 ofFig. 3 in that thehydraulic cylinder 16 and the shut-offvalve 18 are eliminated, while the upper ports of thehydraulic pushers 21 are connected to thedirectional control valve 17. Because the other elements of the alternativehydraulic power unit 13A ofFig. 4 are the same as those that are denoted by the same numbers of thehydraulic power unit 13 ofFig. 3 , their explanations are omitted. - The operation of the molding machine that employs the alternative
hydraulic power unit 13A will now be explained. First, the molding machine makes the upper and lower molds at the same time, in the same manner as in the foregoing embodiment. As a result, the molding machine is thus in the state shown inFigs. 1 and2 . The four shut-off valves are then opened to supply the oil to the fourpipes 20 and the lower ports of the fourhydraulic pushers 21. The oil is also supplied to the upper ports of the fourcylinders 11, to contract them. The four shut-off valves are then closed to shut off the fluid communication between the fourpipes 20 and thehydraulic unit 14. - From the state shown in
Figs. 1 and2 , thecylinder 10 is then extended to raise the cope flask, while the other cylinder (not shown) is contracted to raise thematch plate 7. In this case the velocity of the copeflask 9 when it rises is preferably twice that of thematch plate 7. Thedirectional control valve 17 is then turned to contract thehydraulic pushers 21 through thepusher plate 19 to supply the oil to the upper ports of the fourhydraulic cylinders 11, to extend them. At the same time, thedirectional control valve 23 is turned to supply the compressed air from thecompressor 15 to the fourair cylinders 12 to extend them. Therefore, the fourhydraulic cylinders 11 push down thematch plate 7, while the fourair cylinders 12 push up thematch plate 7. This causes the copeflask 9 and thedrag flask 4, which contain the upper and lower molds, to be simultaneously pushed away from thematch plate 7 and pushed away relative to each other. The copeflask 9 and thedrag flask 4 are thus stripped at the same time, the same as in the foregoing embodiment.
Claims (9)
- A molding method comprising steps of: holding a match plate between a cope flask and a drag flask; inserting an upper squeeze member and a lower squeeze member into openings of said cope and drag flasks, which are opposed to said match plate, to define an upper molding space and a lower molding spaces, respectively; filling said defined molding spaces with molding sand; and forcing said upper and lower squeeze members toward the match plate to squeeze said molding sand within said upper and lower molding spaces to make an upper mold and a lower mold at the same time;
said method being characterized in that:when the flasks are stationary, said cope and drag flasks that include said molded upper and lower molds are pushed away from said match plate at the same time. - The method of claim 1, wherein the velocity at which said cope flask is separated from said drag flask is twice that when said match plate is separated from said drag flask, and wherein the velocity at which said cope flask is separated from said match plate is the same as that when said drag flask is separated from said match plate.
- A molding machine comprising: a cope flask and a drag flask; a match plate to be held between said cope and drag flasks; an upper squeeze member and a lower squeeze member that are insertable into openings of said cope and drag flasks, which are opposed to said match plate; means for filling molding sand within an upper molding space that is defined by said cope flask, said match plate, and said upper squeeze member, and a lower molding space that is defined by said drag flask, said match plate, and said lower squeeze member; compacting means for forcing said upper and lower squeeze members toward the match plate to squeeze said molding sand within said upper and lower molding spaces to mold an upper mold and a lower mold at the same time:said machine being characterized in that:when the flasks are stationary, upper and lower pushing means push away said cope and drag flasks that include said upper and lower molds from said match plate at the same time, wherein said upper means and said lower means are mounted on both the cope flask and the drag flask.
- The molding machine of claim 3, wherein a said upper pushing means is a hydraulic cylinder that is extended by supplying an oil therein, and wherein said lower pushing means is a hydraulic cylinder that has a force for extruding the oil that is less that that of said upper pushing means, or an air cylinder that is extended by the compressed air, or an elastic means that is extended by an elastic member.
- The molding machine of claim 3 or 4, wherein said cope and drag flasks have sand-filling ports on their sidewalls.
- The molding machine of claim 3 or 4, wherein said drag flask is mounted on a rotating frame that is upwardly and downwardly rotated in a vertical plane, and wherein said cope flask is mounted on said rotating frame such that said cope flask can approach and retract from said drag flask.
- The molding machine of claim 3 or 4, wherein said molding machine further comprises a shuttle for carrying in and carrying out said match plate between said cope and drag flasks.
- The molding machine of claim 3 or 4, wherein said molding machine further comprises a mechanism that enables said match plate to approach and retract from the drag flask.
- The molding machine of claim 3 or 4, wherein the resulting molds are tight-flask molds or flaskless molds..
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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JP2007005585 | 2007-01-15 |
Publications (2)
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EP1952912A1 true EP1952912A1 (en) | 2008-08-06 |
EP1952912B1 EP1952912B1 (en) | 2019-03-06 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP07013122.2A Active EP1952912B1 (en) | 2007-01-15 | 2007-07-04 | Molding machine and molding method |
Country Status (9)
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US (1) | US20080169075A1 (en) |
EP (1) | EP1952912B1 (en) |
JP (1) | JP5027879B2 (en) |
KR (1) | KR101392355B1 (en) |
CN (1) | CN101578146A (en) |
BR (1) | BRPI0720981A2 (en) |
MX (1) | MX2009007561A (en) |
TR (1) | TR201904582T4 (en) |
WO (1) | WO2008087759A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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CN102078917B (en) * | 2010-12-21 | 2013-05-08 | 四川海科机械制造有限公司 | Semi-modular forming manufacturing method and application template thereof |
CN102632204B (en) * | 2012-04-28 | 2013-11-20 | 许云东 | Molding device and method for molding by molding sand |
CN114425607B (en) * | 2022-01-25 | 2024-04-02 | 常州大学 | Double-shaft linkage sand box forming equipment with driving side pressure |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3630268A (en) * | 1969-09-08 | 1971-12-28 | Sherwin Williams Co | Foundry molding machine with means to alternately index cope and drag flasks between molding and closing units |
US3744549A (en) * | 1967-08-18 | 1973-07-10 | Buehler Eugen | Apparatus for automatic production and transportation of flaskless sand moulds in metal casting |
US3878881A (en) * | 1972-03-10 | 1975-04-22 | Pettibone Corp | Method for producing and assembling cope and drag mold parts |
EP0468355A2 (en) * | 1990-07-27 | 1992-01-29 | Sintokogio Ltd. | Flaskless molding machine |
WO2000050187A1 (en) * | 1999-02-23 | 2000-08-31 | Disa Industries A/S | Machine for producing flaskless moulds |
EP1695776A1 (en) * | 2003-12-18 | 2006-08-30 | Sintokogio, Ltd. | Method and device for forming flaskless cope and drag, and method of replacing matchplate |
EP1726382A1 (en) * | 2004-03-18 | 2006-11-29 | Sintokogio, Ltd. | Method of forming molding-flask-less, upper and lower molds and device therefor |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4411303A (en) * | 1979-10-01 | 1983-10-25 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Sand mold-producing apparatus |
JPS6418547A (en) * | 1987-07-13 | 1989-01-23 | Taiyo Chuki Kk | Automatic snap flask molding method |
JP4288668B2 (en) * | 2003-12-18 | 2009-07-01 | 新東工業株式会社 | Separation device for upper and lower molds from match plate |
-
2007
- 2007-07-04 TR TR2019/04582T patent/TR201904582T4/en unknown
- 2007-07-04 EP EP07013122.2A patent/EP1952912B1/en active Active
- 2007-07-09 US US11/822,578 patent/US20080169075A1/en not_active Abandoned
- 2007-07-11 KR KR1020097015170A patent/KR101392355B1/en active IP Right Grant
- 2007-07-11 JP JP2009525815A patent/JP5027879B2/en active Active
- 2007-07-11 WO PCT/JP2007/064125 patent/WO2008087759A1/en active Application Filing
- 2007-07-11 CN CNA2007800497794A patent/CN101578146A/en active Pending
- 2007-07-11 MX MX2009007561A patent/MX2009007561A/en not_active Application Discontinuation
- 2007-07-11 BR BRPI0720981-9A patent/BRPI0720981A2/en active IP Right Grant
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3744549A (en) * | 1967-08-18 | 1973-07-10 | Buehler Eugen | Apparatus for automatic production and transportation of flaskless sand moulds in metal casting |
US3630268A (en) * | 1969-09-08 | 1971-12-28 | Sherwin Williams Co | Foundry molding machine with means to alternately index cope and drag flasks between molding and closing units |
US3878881A (en) * | 1972-03-10 | 1975-04-22 | Pettibone Corp | Method for producing and assembling cope and drag mold parts |
EP0468355A2 (en) * | 1990-07-27 | 1992-01-29 | Sintokogio Ltd. | Flaskless molding machine |
WO2000050187A1 (en) * | 1999-02-23 | 2000-08-31 | Disa Industries A/S | Machine for producing flaskless moulds |
EP1695776A1 (en) * | 2003-12-18 | 2006-08-30 | Sintokogio, Ltd. | Method and device for forming flaskless cope and drag, and method of replacing matchplate |
EP1726382A1 (en) * | 2004-03-18 | 2006-11-29 | Sintokogio, Ltd. | Method of forming molding-flask-less, upper and lower molds and device therefor |
Also Published As
Publication number | Publication date |
---|---|
KR20090101466A (en) | 2009-09-28 |
BRPI0720981A2 (en) | 2014-03-18 |
US20080169075A1 (en) | 2008-07-17 |
MX2009007561A (en) | 2009-07-22 |
CN101578146A (en) | 2009-11-11 |
JP2010515574A (en) | 2010-05-13 |
TR201904582T4 (en) | 2019-05-21 |
EP1952912B1 (en) | 2019-03-06 |
WO2008087759A1 (en) | 2008-07-24 |
KR101392355B1 (en) | 2014-05-08 |
JP5027879B2 (en) | 2012-09-19 |
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