EP3064292A1 - Mold shaping device - Google Patents
Mold shaping device Download PDFInfo
- Publication number
- EP3064292A1 EP3064292A1 EP14857419.7A EP14857419A EP3064292A1 EP 3064292 A1 EP3064292 A1 EP 3064292A1 EP 14857419 A EP14857419 A EP 14857419A EP 3064292 A1 EP3064292 A1 EP 3064292A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mold
- forming
- runners
- foamed mixture
- forming mold
- 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
- 238000007493 shaping process Methods 0.000 title 1
- 239000000203 mixture Substances 0.000 claims abstract description 77
- 238000002347 injection Methods 0.000 claims abstract description 37
- 239000007924 injection Substances 0.000 claims abstract description 37
- 239000000654 additive Substances 0.000 claims description 16
- 230000000996 additive effect Effects 0.000 claims description 16
- 238000013019 agitation Methods 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000003232 water-soluble binding agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C13/00—Moulding machines for making moulds or cores of particular shapes
- B22C13/08—Moulding machines for making moulds or cores of particular shapes for shell moulds or shell cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C19/00—Components or accessories for moulding machines
-
- 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
- B22C9/04—Use of lost patterns
- B22C9/046—Use of patterns which are eliminated by the liquid metal in the mould
Definitions
- the present invention relates to a mold forming apparatus, and more particularly to a mold forming apparatus including: a storage tank that has in its bottom an injection port capable of being opened and closed and that stores a foamed mixture formed by agitating a granular aggregate and an additive; a forming mold that has a runner into which the foamed mixture is introduced through the injection port of the storage tank and that has a cavity for forming the introduced foamed mixture into a mold in a predetermined shape; and pressing means that is disposed so as to correspond to the forming mold and that presses the foamed mixture stored in the storage tank to inject the foamed mixture into the cavity through the runner of the forming mold.
- Patent Document 1 is known as related art of a mold forming apparatus.
- Patent Document 1 describes a mold forming apparatus that forms a mold by filling a cavity of a heated mold with a foamed mixture formed by agitating a granular aggregate, a water soluble binder, and water by an injection method, characterized by including: mixture storage means that has a hollow rectangular parallelepiped body having the shape of a rectangular parallelepiped and having a space extending in the vertical direction, that has a bottom plate closing an opening at the lower end of the hollow rectangular parallelepiped body and having injection holes for injecting the foamed mixture, and that has both a function as an agitation tank in which the granular aggregate, the water soluble binder, and the water are agitated, and a function as an injection cylinder that stores the foamed mixture in order to inject the foamed mixture; and plug means capable of closing the injection holes.
- a plurality of runners are formed in the forming mold according to the size, shape, etc. of a mold to be formed, and a plurality of injection holes are formed in the bottom plate of the hollow rectangular parallelepiped body (hereinafter referred to as a "bottom of the storage tank") so as to correspond to inlets of the runners.
- the runners are typically formed linearly and parallel to the direction in which the foamed mixture stored in the storage tank is injected.
- the forming mold is typically formed by a pair of forming molds that can be opened and closed, and is often formed such that abutting surfaces (parting surface) of both the forming molds extend in a direction perpendicular to the direction in which the pressing means presses the foamed mixture, that is, such that the runners are formed in one of the forming molds and the direction in which the forming molds are opened and closed is parallel to the direction in which the pressing means presses the foamed mixture.
- Patent Document International Publication No. WO 2005/089984
- injection ports are formed in the bottom of the storage tank so as to correspond to the inlets of the runners.
- the bottom of the storage tank therefore needs to have substantially the same size as the maximum width of the surface of the forming mold in which the inlets of the runners are formed.
- the storage tank is formed in a cylindrical shape in order to agitate the granular aggregate and the additive to form the foamed mixture by rotating agitating blades in the storage tank
- the storage tank is formed such that the diameter of the bottom of the cylindrical storage tank is substantially the same as the maximum width of the surface of the forming mold in which the inlets of the runners are formed. Accordingly, in the case where the cavity of the forming mold is large or has a complex shape etc., the diameter of the storage tank is increased accordingly, which increases the overall size of the mold forming apparatus and the space required to install the mold forming apparatus.
- the direction in which the forming molds are opened and closed is parallel to the direction in which the pressing means presses the foamed mixture
- a large distance is required between the forming mold and the pressing means so that the forming mold does not interfere with the pressing means when opened. This increases the overall size of the mold forming apparatus and the space required to install the mold forming apparatus.
- the runners are formed in one of the forming molds. In this case, the solidified foamed mixture remains in the runners after a mold is formed, and it is difficult to remove this solidified foamed mixture.
- the present invention was developed in view of the above problems, and it is an object of the present invention to provide a mold forming apparatus capable of accurately forming a mold by reliably causing a foamed mixture to appropriately fill a cavity of a forming mold by a simple configuration, and capable of achieving reduction in size.
- a mold forming apparatus of claim 1 is a mold forming apparatus including a storage tank that has in its bottom a plurality of injection ports capable of being opened and closed, and that stores a foamed mixture formed by agitating a granular aggregate and an additive, a forming mold that has a plurality of runners into which the foamed mixture is introduced through their inlets formed so as to correspond to the respective injection ports of the storage tank, and that has a cavity for forming the introduced foamed mixture into a mold with a predetermined shape, and pressing means that is disposed so as to correspond to the forming mold and that presses the foamed mixture stored in the storage tank to inject the foamed mixture into the cavity through the runners of the forming mold, characterized in that a parting surface of the forming mold is formed parallel to a pressing direction of the pressing means, and each of the runners of the forming mold is formed in the parting surface and is tilted with respect to the pressing direction of the pressing means so as to spread
- the invention of the mold forming apparatus of claim 2 is characterized in that the runners extend from the inlets and branch off in an intermediate portion on a downstream side being allowed to obtain the plurality of outlets guided to the cavities.
- the parting surface of the forming mold is formed parallel to the pressing direction of the pressing means, and each of the runners of the forming mold is formed in the parting surface of the forming mold and is tilted with respect to the pressing direction of the pressing means so as to spread apart from other runners from the inlet toward its outlet to the cavity.
- the bottom of the storage tank can be made smaller than the maximum width of the surface of the forming mold in which the inlets of the runners are formed.
- the storage tank therefore need not have a size according to the size of the forming mold, and can thus be reduced in size.
- the forming mold does not interfere with the pressing means when opened.
- the mold forming apparatus can thus be reduced in size. Since the runners are formed in the parting surface of the forming mold, any solidified foamed mixture remaining inside the runners can be easily removed by opening the forming mold.
- the runners extend from the inlets and branch off in an intermediate portion on the downstream side, and have the plurality of the outlets, which guide to the cavities.
- the inlets of the runners therefore need not be formed so as to correspond to the number of cavities, and the foamed mixture can be reliably caused to appropriately fill the cavities of the forming mold.
- invention that can be claimed includes at least the "invention” or “present invention” that is the invention described in the claims, but may include an invention having a narrower concept than the present invention or an invention having a broader concept or a different concept than the present invention) will be shown and described below.
- the forms are divided into items, the items are numbered, and the number(s) of other item(s) is cited as necessary. This is merely for facilitating understanding of the invention that can be claimed, and is not intended to limit the combination of constituent elements forming the invention that can be claimed to the combinations described in the items shown below.
- the agitating member After the granular aggregate and the additive which have been put in the storage tank are agitated by the agitating member to form the foamed mixture, the agitating member is immediately moved relative to the storage tank to the withdrawn position by the moving means, and the storage tank is relatively moved to the position between the forming mold and the pressing means to connect the injection ports to the inlets of the runners of the forming mold.
- the cavities of the forming mold can thus be reliably and quickly filled with the foamed mixture in a satisfactory state.
- FIGS. 1 to 3 An embodiment of a mold forming apparatus of the present invention will be described in detail based on FIGS. 1 to 3 .
- the same reference numerals and characters are used throughout the figures to denote similar or corresponding portions.
- the mold forming apparatus of the present invention generally includes: a storage tank 1 that has in its bottom 1a a plurality of injection ports 10 capable of being opened and closed, and that stores a foamed mixture formed by agitating a granular aggregate and an additive; a forming mold 2 that has a plurality of runners 20 into which the foamed mixture is introduced through their inlets 20a formed so as to correspond to the respective injection ports 10 of the storage tank 1, and that has cavities 21 for forming the introduced foamed mixture into a mold with a predetermined shape; and pressing means 3 that is disposed so as to correspond to the forming mold 2 and that presses the foamed mixture stored in the storage tank 1 to inject the foamed mixture into the cavities 21 through the runners 20 of the forming mold 2.
- a parting surface 22 of the forming mold 2 is formed parallel to a pressing direction P of the pressing means 3.
- Each of the runners 20 of the forming mold 2 is formed in the parting surface 22 and is tilted with respect to the pressing direction P of the pressing means 3 so as to spread apart from other runners in a direction from the inlet toward its outlet guided to the cavity.
- the runners 20 extend from the inlets 20a and branch off in an intermediate portion on a downstream side being allowed to obtain the plurality of the outlets 20b guided to the cavities 21.
- the storage tank 1 is formed in a cylindrical shape (hereinafter referred to as the "cylindrical tank 1"), and the bottom 1a has a diameter D smaller than the maximum width W of a surface 2a of the forming mold 2 in which the inlets 20a of the runners 20 are formed.
- the mold forming apparatus of the present embodiment further includes agitating means 4 including an agitating member 40 that rotates inside the cylindrical tank 1 to agitate the granular aggregate and the additive, which have been put in the cylindrical tank 1, to form the foamed mixture.
- the mold forming apparatus of the present embodiment further includes moving means (described later) for relatively moving the cylindrical tank 1 and the agitating member 40 between an agitating position where the agitating member 40 is located inside the cylindrical tank 1 and a withdrawn position where the agitating member 40 is located outside the cylindrical tank 1 and for relatively moving the cylindrical tank 1 between the withdrawn position and a position between the forming mold 2 and the pressing means 3 where the injection ports 10 are connected to the inlets 20a of the runners 20 of the forming mold 2.
- moving means described later
- the cylindrical tank 1 is open in its upper part and has the plurality of injection ports 10 in the bottom 1a.
- the bottom 1a therefore has a circular shape as shown in FIG. 2 .
- the bottom 1a is provided with opening/closing means such as a plug member or a shutter which controllably opens and closes the injection ports 10.
- the forming mold 2 is formed by a pair of forming molds 2A, 2B so that the parting surface 22 of the forming molds 2A, 2B extends vertically.
- the forming molds 2A, 2B are therefore opened and closed along the vertical direction on the paper of FIG. 2 showing a plan view.
- the runners 20 for introducing the foamed mixture and the cavities 21 for forming a mold with a predetermined shape are formed in abutting surfaces of the forming molds 2A, 2B.
- the inlets 20a of the runners 20 are open at the upper surface of the forming mold 2 in FIG. 3 .
- the inlets 20a of the runners 20 are disposed so as to be aligned with the injection ports 10 when the cylindrical tank 1 is located on the surface 2a of the forming mold 2 in which the inlets 20a of the runners 20 are formed.
- the runners 20 are formed such that small parts of their upstream portions which extend from the inlets 20a to be connected to the injection ports 10 are parallel to the pressing direction P of the pressing means 3.
- the runners 20 are bent at an intermediate position, and their intermediate portions forming large parts of the runners 20 are tilted with respect to the pressing direction P of the pressing means 3 so as to spread apart from each other.
- each of the runners 20 branches into two in its downstream portion, and the outlets 20b are respectively open to a plurality of the cavities 21 via a core print part 23 provided in the forming mold 2.
- the angle at which the runners 20 are tilted with respect to the pressing direction P of the pressing means 3 can be set as appropriate in view of the shape and size of a mold to be formed, the positions of the cavities 21 that are formed in the forming mold 2, fluidity of the foamed mixture, etc.
- the pressing means 3 has a cylinder 30 provided above the forming mold 2, and a piston 31 fittingly inserted in the cylinder 30 and provided with a pressing portion 31a that enters the cylindrical tank 1 through an opening in the upper part of the cylindrical tank 1 to press the foamed mixture.
- the pressing direction P of the pressing means 3 is downward in the vertical direction in FIG. 3 .
- the pressing portion 31a at the tip end of the piston 31 can thus enter the cylindrical tank 1 through the opening in the upper part of the cylindrical tank 1 and press the foamed mixture to inject the foamed mixture through the injection ports 10 to fill the cavities 21 with the foamed mixture through the runners 20 of the forming mold 2. That is, the cylindrical tank 1 functions as an injection cylinder that injects the foamed mixture stored therein to fill the cavities 21 of the forming mold 2 with the foamed mixture.
- the parting surface 22 of the forming molds 2A, 2B extends vertically, and the forming molds 2A, 2B are opened and closed along the lateral direction or in the front -back direction in the plane of the paper of FIG. 3 .
- the cylinder 30 can therefore be disposed at about such a height that, with the piston 31 in the cylinder 30 being in a retracted state, the pressing portion 31a does not interfere with the cylindrical tank 1 when the cylindrical tank 1 is moved to the left from the withdrawn position of agitating blades 40a as indicated by an arrow S in FIG. 1 .
- the agitating member 40 of the agitating means 4 has a plurality of agitating blades 40a around a rotary shaft 40b.
- the rotary shaft 40b for the agitating blades 40a is connected to a rotary drive shaft of a motor 41.
- the motor 41 is supported by a support member 42.
- the cylindrical tank 1 can function not only as the injection cylinder described above but also as an agitation tank in which the granular aggregate and the additive are agitated to form the foamed mixture.
- the agitating blades 40a can also be reduced in size. The load on the motor 41 that drivingly rotates the agitating blades 40a is therefore reduced accordingly, whereby the motor 41 can also be reduced in size.
- the moving means includes: agitating blade moving means 5 that moves the agitating blades 40a of the agitating means 4 between the agitating position where the agitating blades 40a having been moved into the cylindrical tank 1 through the opening in the upper part of the cylindrical tank 1 can agitate the granular aggregate and the additive, and the withdrawn position where the agitating blades 40a are withdrawn out of the cylindrical tank 1 through the opening in the upper part of the cylindrical tank 1 (see an arrow V in FIG. 1 ); and moving the cylindrical tank 1 to the position between the pressing portion 31a and the forming mold 2 with the agitating blades 40a being located at the withdrawn position and the piston 31 of the pressing means 3 being in the retracted state (see the arrow S in FIG.
- the agitating blade moving means 5 includes a cylinder 50 disposed at a predetermined height and having the support member 42 bonded to the tip end of a piston rod 51.
- the piston rod 51 of the cylinder 50 is immediately driven to retract so that the agitating blades 40a are moved to withdraw, and the cylindrical tank 1 is moved in the direction indicated by the arrow S in FIG. 1 to the position between the upper surface 2a of the forming mold 2 and the pressing portion 31a of the pressing means 3.
- the bottom 1a is placed on the upper surface 2a of the forming mold 2 such that the injection ports 10 are aligned with the inlets 20a of the runners 20.
- the cavities 21 of the forming mold 2 are thus filled with the foamed mixture in a satisfactory state, and a mold having satisfactory shape accuracy etc. can be formed.
- the outlets 20b of the runners 20 which open to the cavities 21 in the forming mold 2 are disposed according to the size or shape of a mold to be formed.
- the runners 20 are formed in the parting surface 22 of the forming mold 2 and are tilted with respect to the pressing direction P of the pressing means 3 so as to spread apart from each other from the inlets 20a toward the outlets 20b.
- the inlets 20a of the runners 20 are formed in the upper surface 2a of the forming mold 2 which is to be contacted by the cylindrical tank 1, and are open to the parting surface 22 of the forming molds 2A, 2B.
- the injection ports 10 of the cylindrical tank 1 are disposed in the bottom 1a such that the injection ports 10 can be aligned with the inlets 20a of the runners 20 so as to communicate with the inlets 20a of the runners 20.
- the cylindrical tank 1 is therefore formed such that its diameter D is smaller than the maximum width W of the forming mold 2.
- the diameter D of the cylindrical tank 1 can be set such that the area of the bottom 1a is 70% to 30%, more preferably 50% to 30%, of that of the upper surface 2a of the forming mold 2 in which the inlets 20a of the runners 20 are open. This can reliably make the bottom 1a of the cylindrical tank 1 smaller than the maximum width W of the upper surface 2a of the forming mold 2 in which the inlets 20a of the runners 20 are formed.
- the mold forming apparatus can therefore be reduced in size. Since the parting surface 22 of the forming mold 2 is parallel to the pressing direction P of the pressing means 3, the pressing means 3 does not interfere with the forming mold 2 when the forming mold is opened. The mold forming apparatus can therefore be reduced in size. Any solidified foamed mixture remaining in the runners 20 can be easily removed by opening the forming mold 2.
- the present invention is not limited to the above embodiment in which the bottom 1a of the cylindrical tank 1 is positioned on the lower side in the figure and the pressing means 3 presses the foamed mixture from above.
- the present invention may include a configuration in which the bottom 1a of the cylindrical tank 1 is disposed laterally, the forming mold 2 is disposed laterally on the bottom 1a of the cylindrical tank 1, and the pressing means 3 laterally presses the foamed mixture to fill the cavities of the forming mold 2 with the foamed mixture.
- the present invention may also include a configuration in which the bottom 1a of the cylindrical tank 1 is positioned on the upper side upward, the forming mold 2 is disposed on the bottom 1a of the cylindrical tank 1, and the pressing means 3 presses the foamed mixture from below to fill the cavities of the forming mold 2 with the foamed mixture, etc.
- the present invention can be applied to any apparatus that forms a mold in a predetermined shape by storing in a storage tank a foamed mixture formed by agitating a granular aggregate and an additive, and pressing the foamed mixture by pressing means to inject the foamed mixture from the storage tank through an injection port to fill a cavity with the foamed mixture through a runner of a forming mold.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Casting Devices For Molds (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
Description
- The present invention relates to a mold forming apparatus, and more particularly to a mold forming apparatus including: a storage tank that has in its bottom an injection port capable of being opened and closed and that stores a foamed mixture formed by agitating a granular aggregate and an additive; a forming mold that has a runner into which the foamed mixture is introduced through the injection port of the storage tank and that has a cavity for forming the introduced foamed mixture into a mold in a predetermined shape; and pressing means that is disposed so as to correspond to the forming mold and that presses the foamed mixture stored in the storage tank to inject the foamed mixture into the cavity through the runner of the forming mold.
-
Patent Document 1 is known as related art of a mold forming apparatus.Patent Document 1 describes a mold forming apparatus that forms a mold by filling a cavity of a heated mold with a foamed mixture formed by agitating a granular aggregate, a water soluble binder, and water by an injection method, characterized by including: mixture storage means that has a hollow rectangular parallelepiped body having the shape of a rectangular parallelepiped and having a space extending in the vertical direction, that has a bottom plate closing an opening at the lower end of the hollow rectangular parallelepiped body and having injection holes for injecting the foamed mixture, and that has both a function as an agitation tank in which the granular aggregate, the water soluble binder, and the water are agitated, and a function as an injection cylinder that stores the foamed mixture in order to inject the foamed mixture; and plug means capable of closing the injection holes. - In such a mold forming apparatus, in general, in order to cause the foamed mixture to entirely fill the cavity of the forming mold, a plurality of runners are formed in the forming mold according to the size, shape, etc. of a mold to be formed, and a plurality of injection holes are formed in the bottom plate of the hollow rectangular parallelepiped body (hereinafter referred to as a "bottom of the storage tank") so as to correspond to inlets of the runners. In order for the foamed mixture to be reliably injected into the cavity with minimum resistance, the runners are typically formed linearly and parallel to the direction in which the foamed mixture stored in the storage tank is injected.
- The forming mold is typically formed by a pair of forming molds that can be opened and closed, and is often formed such that abutting surfaces (parting surface) of both the forming molds extend in a direction perpendicular to the direction in which the pressing means presses the foamed mixture, that is, such that the runners are formed in one of the forming molds and the direction in which the forming molds are opened and closed is parallel to the direction in which the pressing means presses the foamed mixture.
- Patent Document: International Publication No.
WO 2005/089984 - However, in the case where a plurality of runners are formed according to the size, shape, etc. of a mold to be formed such that the runners extend linearly and parallel to the direction in which the foamed mixture is injected as in the related art, injection ports are formed in the bottom of the storage tank so as to correspond to the inlets of the runners. The bottom of the storage tank therefore needs to have substantially the same size as the maximum width of the surface of the forming mold in which the inlets of the runners are formed. In particular, in the case where the storage tank is formed in a cylindrical shape in order to agitate the granular aggregate and the additive to form the foamed mixture by rotating agitating blades in the storage tank, the storage tank is formed such that the diameter of the bottom of the cylindrical storage tank is substantially the same as the maximum width of the surface of the forming mold in which the inlets of the runners are formed. Accordingly, in the case where the cavity of the forming mold is large or has a complex shape etc., the diameter of the storage tank is increased accordingly, which increases the overall size of the mold forming apparatus and the space required to install the mold forming apparatus.
- In the case where the direction in which the forming molds are opened and closed is parallel to the direction in which the pressing means presses the foamed mixture, a large distance is required between the forming mold and the pressing means so that the forming mold does not interfere with the pressing means when opened. This increases the overall size of the mold forming apparatus and the space required to install the mold forming apparatus. Moreover, in the case where the direction in which the forming molds are opened and closed is parallel to the direction in which the pressing means presses the foamed mixture, the runners are formed in one of the forming molds. In this case, the solidified foamed mixture remains in the runners after a mold is formed, and it is difficult to remove this solidified foamed mixture.
- The present invention was developed in view of the above problems, and it is an object of the present invention to provide a mold forming apparatus capable of accurately forming a mold by reliably causing a foamed mixture to appropriately fill a cavity of a forming mold by a simple configuration, and capable of achieving reduction in size.
- In order to achieve the above object, the invention according to a mold forming apparatus of
claim 1 is a mold forming apparatus including a storage tank that has in its bottom a plurality of injection ports capable of being opened and closed, and that stores a foamed mixture formed by agitating a granular aggregate and an additive, a forming mold that has a plurality of runners into which the foamed mixture is introduced through their inlets formed so as to correspond to the respective injection ports of the storage tank, and that has a cavity for forming the introduced foamed mixture into a mold with a predetermined shape, and pressing means that is disposed so as to correspond to the forming mold and that presses the foamed mixture stored in the storage tank to inject the foamed mixture into the cavity through the runners of the forming mold, characterized in that a parting surface of the forming mold is formed parallel to a pressing direction of the pressing means, and each of the runners of the forming mold is formed in the parting surface and is tilted with respect to the pressing direction of the pressing means so as to spread apart from the inlet toward its outlet guided to the cavity. - In order to achieve the above object, in the invention of
claim 1, the invention of the mold forming apparatus ofclaim 2 is characterized in that the runners extend from the inlets and branch off in an intermediate portion on a downstream side being allowed to obtain the plurality of outlets guided to the cavities. - According to the invention of
claim 1, the parting surface of the forming mold is formed parallel to the pressing direction of the pressing means, and each of the runners of the forming mold is formed in the parting surface of the forming mold and is tilted with respect to the pressing direction of the pressing means so as to spread apart from other runners from the inlet toward its outlet to the cavity. With this simple configuration, the bottom of the storage tank can be made smaller than the maximum width of the surface of the forming mold in which the inlets of the runners are formed. The storage tank therefore need not have a size according to the size of the forming mold, and can thus be reduced in size. Moreover, the forming mold does not interfere with the pressing means when opened. The mold forming apparatus can thus be reduced in size. Since the runners are formed in the parting surface of the forming mold, any solidified foamed mixture remaining inside the runners can be easily removed by opening the forming mold. - According to the invention of
claim 2, the runners extend from the inlets and branch off in an intermediate portion on the downstream side, and have the plurality of the outlets, which guide to the cavities. The inlets of the runners therefore need not be formed so as to correspond to the number of cavities, and the foamed mixture can be reliably caused to appropriately fill the cavities of the forming mold. - Some forms of the invention that is recognized as being able to be claimed in the present application (hereinafter sometimes referred to as the "invention that can be claimed"; the invention that can be claimed includes at least the "invention" or "present invention" that is the invention described in the claims, but may include an invention having a narrower concept than the present invention or an invention having a broader concept or a different concept than the present invention) will be shown and described below. As in the claims, the forms are divided into items, the items are numbered, and the number(s) of other item(s) is cited as necessary. This is merely for facilitating understanding of the invention that can be claimed, and is not intended to limit the combination of constituent elements forming the invention that can be claimed to the combinations described in the items shown below. That is, the invention that can be claimed should be interpreted in view of the description associated with each item, the description of the embodiment, etc., and any form in which other constituent element(s) is added to the form of each item or any form in which the constituent element(s) is eliminated from the form of each item may be one form of the invention that can be claimed, as long as these forms are consistent with the interpretation. In the following items, items (1), (2) correspond to
claims - (1) A mold forming apparatus including
a storage tank that has in its bottom a plurality of injection ports capable of being opened and closed, and that stores a foamed mixture formed by agitating a granular aggregate and an additive;
a forming mold that has a plurality of runners into which the foamed mixture is introduced through their inlets formed so as to correspond to the respective injection ports of the storage tank, and that has a cavity for forming the introduced foamed mixture into a mold with a predetermined shape; and
pressing means that is disposed so as to correspond to the forming mold and that presses the foamed mixture stored in the storage tank to inject the foamed mixture into the cavity through the runners of the forming mold, characterized in that
a parting surface of the forming mold is formed parallel to a pressing direction of the pressing means, and
each of the runners of the forming mold is formed in the parting surface and is tilted with respect to the pressing direction of the pressing means so as to spread apart from the inlet toward its outlet guided to the cavity. - (2) The mold forming apparatus according to item (1), characterized in that the runners extend from the inlets and branch off in an intermediate portion on a downstream side being allowed to obtain the plurality of the outlets guided to the cavity.
- (3) The mold forming apparatus according to item (1) or (2), characterized in that an area of the bottom of the storage tank is 70% to 30% of that of a surface of the forming mold in which the inlets of the runners are formed.
Setting the area of the bottom of the tank to 70% to 30%, more preferably 50% to 30%, of that of the surface of the forming mold in which the inlets of the runners are formed makes it possible to make the diameter of the bottom of the cylindrical storage tank smaller than a maximum width of the surface of the forming mold in which the inlets_of the runners are formed. - (4) The mold forming apparatus according to any one of items (1) to (3), characterized in that the storage tank is formed in a cylindrical shape and the bottom has a diameter smaller than a maximum width of the surface of the forming mold in which the inlets of the runners are formed.
Making the diameter of the bottom of the cylindrical storage tank smaller than the maximum width of the surface of the forming mold in which the inlets of the runners are formed makes it possible to make the bottom of the storage tank smaller than the maximum width of the surface of the forming mold in which the inlets of the runners are formed. - (5) The mold forming apparatus according to any one of items (1) to (4), characterized by further including agitating means including an agitating member that rotates inside the storage tank to agitate the granular aggregate and the additive, which have been put in the storage tank, to form the foamed mixture.
With the agitating means, the storage tank can function both as an agitation tank in which the granular aggregate and the additive are agitated and as an injection cylinder that injects the foamed mixture stored therein into the forming mold. - (6) The mold forming apparatus according to item (5), characterized by further including moving means for relatively moving the storage tank and the agitating member between an agitating position where the agitating member is located inside the storage tank and a withdrawn position where the agitating member is located outside the storage tank and for relatively moving the storage tank between the withdrawn position and a position between the forming mold and the pressing means where the injection ports are connected to the inlets of the runners of the forming mold.
- After the granular aggregate and the additive which have been put in the storage tank are agitated by the agitating member to form the foamed mixture, the agitating member is immediately moved relative to the storage tank to the withdrawn position by the moving means, and the storage tank is relatively moved to the position between the forming mold and the pressing means to connect the injection ports to the inlets of the runners of the forming mold. The cavities of the forming mold can thus be reliably and quickly filled with the foamed mixture in a satisfactory state.
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- [
FIG. 1] FIG. 1 is a schematic front view illustrating an embodiment of an entire mold forming apparatus of the present invention. - [
FIG. 2] FIG. 2 is a plan view illustrating a storage tank and a forming mold of the present invention. - [
FIG. 3] FIG. 3 is a front view ofFIG. 2 . - An embodiment of a mold forming apparatus of the present invention will be described in detail based on
FIGS. 1 to 3 . The same reference numerals and characters are used throughout the figures to denote similar or corresponding portions. - The mold forming apparatus of the present invention generally includes: a
storage tank 1 that has in itsbottom 1a a plurality ofinjection ports 10 capable of being opened and closed, and that stores a foamed mixture formed by agitating a granular aggregate and an additive; a formingmold 2 that has a plurality ofrunners 20 into which the foamed mixture is introduced through theirinlets 20a formed so as to correspond to therespective injection ports 10 of thestorage tank 1, and that hascavities 21 for forming the introduced foamed mixture into a mold with a predetermined shape; and pressingmeans 3 that is disposed so as to correspond to the formingmold 2 and that presses the foamed mixture stored in thestorage tank 1 to inject the foamed mixture into thecavities 21 through therunners 20 of the formingmold 2. Aparting surface 22 of the formingmold 2 is formed parallel to a pressing direction P of the pressingmeans 3. Each of therunners 20 of the formingmold 2 is formed in theparting surface 22 and is tilted with respect to the pressing direction P of thepressing means 3 so as to spread apart from other runners in a direction from the inlet toward its outlet guided to the cavity. - In the mold forming apparatus of the present invention, the
runners 20 extend from theinlets 20a and branch off in an intermediate portion on a downstream side being allowed to obtain the plurality of theoutlets 20b guided to thecavities 21. - In the mold forming apparatus of the present embodiment, the
storage tank 1 is formed in a cylindrical shape (hereinafter referred to as the "cylindrical tank 1"), and the bottom 1a has a diameter D smaller than the maximum width W of asurface 2a of the formingmold 2 in which theinlets 20a of therunners 20 are formed. The mold forming apparatus of the present embodiment further includes agitating means 4 including an agitatingmember 40 that rotates inside thecylindrical tank 1 to agitate the granular aggregate and the additive, which have been put in thecylindrical tank 1, to form the foamed mixture. The mold forming apparatus of the present embodiment further includes moving means (described later) for relatively moving thecylindrical tank 1 and the agitatingmember 40 between an agitating position where the agitatingmember 40 is located inside thecylindrical tank 1 and a withdrawn position where the agitatingmember 40 is located outside thecylindrical tank 1 and for relatively moving thecylindrical tank 1 between the withdrawn position and a position between the formingmold 2 and thepressing means 3 where theinjection ports 10 are connected to theinlets 20a of therunners 20 of the formingmold 2. - The
cylindrical tank 1 is open in its upper part and has the plurality ofinjection ports 10 in the bottom 1a. The bottom 1a therefore has a circular shape as shown inFIG. 2 . The bottom 1a is provided with opening/closing means such as a plug member or a shutter which controllably opens and closes theinjection ports 10. - In the present embodiment, the forming
mold 2 is formed by a pair of formingmolds parting surface 22 of the formingmolds molds FIG. 2 showing a plan view. Therunners 20 for introducing the foamed mixture and thecavities 21 for forming a mold with a predetermined shape are formed in abutting surfaces of the formingmolds inlets 20a of therunners 20 are open at the upper surface of the formingmold 2 inFIG. 3 . Theinlets 20a of therunners 20 are disposed so as to be aligned with theinjection ports 10 when thecylindrical tank 1 is located on thesurface 2a of the formingmold 2 in which theinlets 20a of therunners 20 are formed. In the embodiment shown inFIG. 3 , therunners 20 are formed such that small parts of their upstream portions which extend from theinlets 20a to be connected to theinjection ports 10 are parallel to the pressing direction P of thepressing means 3. Therunners 20 are bent at an intermediate position, and their intermediate portions forming large parts of therunners 20 are tilted with respect to the pressing direction P of thepressing means 3 so as to spread apart from each other. In the present embodiment, each of therunners 20 branches into two in its downstream portion, and theoutlets 20b are respectively open to a plurality of thecavities 21 via acore print part 23 provided in the formingmold 2. The angle at which therunners 20 are tilted with respect to the pressing direction P of thepressing means 3 can be set as appropriate in view of the shape and size of a mold to be formed, the positions of thecavities 21 that are formed in the formingmold 2, fluidity of the foamed mixture, etc. - In the present embodiment, the
pressing means 3 has acylinder 30 provided above the formingmold 2, and apiston 31 fittingly inserted in thecylinder 30 and provided with apressing portion 31a that enters thecylindrical tank 1 through an opening in the upper part of thecylindrical tank 1 to press the foamed mixture. In the present embodiment, the pressing direction P of thepressing means 3 is downward in the vertical direction inFIG. 3 . With the bottom 1a of thecylindrical tank 1 being placed on theupper surface 2a of the formingmold 2 such that theinjection ports 10 are aligned with theinlets 20a of therunners 20 and are opened, thepiston 31 in thecylinder 30 is driven to extend. Thepressing portion 31a at the tip end of thepiston 31 can thus enter thecylindrical tank 1 through the opening in the upper part of thecylindrical tank 1 and press the foamed mixture to inject the foamed mixture through theinjection ports 10 to fill thecavities 21 with the foamed mixture through therunners 20 of the formingmold 2. That is, thecylindrical tank 1 functions as an injection cylinder that injects the foamed mixture stored therein to fill thecavities 21 of the formingmold 2 with the foamed mixture. Theparting surface 22 of the formingmolds molds FIG. 3 . As described below, thecylinder 30 can therefore be disposed at about such a height that, with thepiston 31 in thecylinder 30 being in a retracted state, thepressing portion 31a does not interfere with thecylindrical tank 1 when thecylindrical tank 1 is moved to the left from the withdrawn position of agitatingblades 40a as indicated by an arrow S inFIG. 1 . - In the present embodiment, the agitating
member 40 of the agitating means 4 has a plurality of agitatingblades 40a around arotary shaft 40b. Therotary shaft 40b for the agitatingblades 40a is connected to a rotary drive shaft of amotor 41. Themotor 41 is supported by asupport member 42. With theinjection ports 10 of thecylindrical tank 1 being closed, the granular aggregate and the additive are put in thecylindrical tank 1. The agitatingblades 40a are moved into thecylindrical tank 1, and themotor 41 is driven to rotate, whereby the granular aggregate and the additive can be agitated to form the foamed mixture in thecylindrical tank 1. That is, thecylindrical tank 1 can function not only as the injection cylinder described above but also as an agitation tank in which the granular aggregate and the additive are agitated to form the foamed mixture. In the present invention, since the diameter D of the bottom 1a of thecylindrical tank 1 is smaller than the maximum width W of thesurface 2a of the formingmold 2 in which theinlets 20a of therunners 20 are formed, the agitatingblades 40a can also be reduced in size. The load on themotor 41 that drivingly rotates the agitatingblades 40a is therefore reduced accordingly, whereby themotor 41 can also be reduced in size. - In the present embodiment, the moving means includes: agitating blade moving means 5 that moves the agitating
blades 40a of the agitating means 4 between the agitating position where the agitatingblades 40a having been moved into thecylindrical tank 1 through the opening in the upper part of thecylindrical tank 1 can agitate the granular aggregate and the additive, and the withdrawn position where the agitatingblades 40a are withdrawn out of thecylindrical tank 1 through the opening in the upper part of the cylindrical tank 1 (see an arrow V inFIG. 1 ); and moving thecylindrical tank 1 to the position between thepressing portion 31a and the formingmold 2 with the agitatingblades 40a being located at the withdrawn position and thepiston 31 of thepressing means 3 being in the retracted state (see the arrow S inFIG. 1 ). In the present embodiment, the agitatingblade moving means 5 includes acylinder 50 disposed at a predetermined height and having thesupport member 42 bonded to the tip end of apiston rod 51. In the present embodiment, after the granular aggregate and the additive which have been put in thecylindrical tank 1 are agitated by the agitatingblades 40a to form the foamed mixture, thepiston rod 51 of thecylinder 50 is immediately driven to retract so that the agitatingblades 40a are moved to withdraw, and thecylindrical tank 1 is moved in the direction indicated by the arrow S inFIG. 1 to the position between theupper surface 2a of the formingmold 2 and thepressing portion 31a of thepressing means 3. The bottom 1a is placed on theupper surface 2a of the formingmold 2 such that theinjection ports 10 are aligned with theinlets 20a of therunners 20. Thecavities 21 of the formingmold 2 are thus filled with the foamed mixture in a satisfactory state, and a mold having satisfactory shape accuracy etc. can be formed. - The
outlets 20b of therunners 20 which open to thecavities 21 in the formingmold 2 are disposed according to the size or shape of a mold to be formed. Therunners 20 are formed in theparting surface 22 of the formingmold 2 and are tilted with respect to the pressing direction P of thepressing means 3 so as to spread apart from each other from theinlets 20a toward theoutlets 20b. Theinlets 20a of therunners 20 are formed in theupper surface 2a of the formingmold 2 which is to be contacted by thecylindrical tank 1, and are open to theparting surface 22 of the formingmolds injection ports 10 of thecylindrical tank 1 are disposed in the bottom 1a such that theinjection ports 10 can be aligned with theinlets 20a of therunners 20 so as to communicate with theinlets 20a of therunners 20. Thecylindrical tank 1 is therefore formed such that its diameter D is smaller than the maximum width W of the formingmold 2. The diameter D of thecylindrical tank 1 can be set such that the area of the bottom 1a is 70% to 30%, more preferably 50% to 30%, of that of theupper surface 2a of the formingmold 2 in which theinlets 20a of therunners 20 are open. This can reliably make the bottom 1a of thecylindrical tank 1 smaller than the maximum width W of theupper surface 2a of the formingmold 2 in which theinlets 20a of therunners 20 are formed. The mold forming apparatus can therefore be reduced in size. Since theparting surface 22 of the formingmold 2 is parallel to the pressing direction P of thepressing means 3, thepressing means 3 does not interfere with the formingmold 2 when the forming mold is opened. The mold forming apparatus can therefore be reduced in size. Any solidified foamed mixture remaining in therunners 20 can be easily removed by opening the formingmold 2. - The present invention is not limited to the above embodiment in which the bottom 1a of the
cylindrical tank 1 is positioned on the lower side in the figure and thepressing means 3 presses the foamed mixture from above. For example, the present invention may include a configuration in which the bottom 1a of thecylindrical tank 1 is disposed laterally, the formingmold 2 is disposed laterally on the bottom 1a of thecylindrical tank 1, and thepressing means 3 laterally presses the foamed mixture to fill the cavities of the formingmold 2 with the foamed mixture. The present invention may also include a configuration in which the bottom 1a of thecylindrical tank 1 is positioned on the upper side upward, the formingmold 2 is disposed on the bottom 1a of thecylindrical tank 1, and thepressing means 3 presses the foamed mixture from below to fill the cavities of the formingmold 2 with the foamed mixture, etc. - The present invention can be applied to any apparatus that forms a mold in a predetermined shape by storing in a storage tank a foamed mixture formed by agitating a granular aggregate and an additive, and pressing the foamed mixture by pressing means to inject the foamed mixture from the storage tank through an injection port to fill a cavity with the foamed mixture through a runner of a forming mold.
-
- 1:
- Cylindrical Tank (Storage Tank)
- 1a:
- Bottom
- 2:
- Forming Mold
- 3:
- Pressing Means
- 4:
- Agitating Means
- 10:
- Injection Port
- 20:
- Runner
- 20a:
- Inlet
- 20b:
- Outlet
- 21:
- Cavity
- 22:
- Parting Surface
- 40:
- Agitating Member
- D:
- Diameter of Cylindrical Tank
- W:
- Maximum Width of Forming Mold
Claims (2)
- A mold forming apparatus including:a storage tank that has in its bottom a plurality of injection ports capable of being opened and closed, and that stores a foamed mixture formed by agitating a granular aggregate and an additive,a forming mold that has a plurality of runners into which the foamed mixture is introduced through their inlets formed so as to correspond to the respective injection ports of the storage tank, and that has a cavity for forming the introduced foamed mixture into a mold with a predetermined shape, anda pressing means that is disposed so as to correspond to the forming mold and that presses the foamed mixture stored in the storage tank to inject the foamed mixture into the cavity through the runners of the forming mold, whereina parting surface of the forming mold is formed parallel to a pressing direction of the pressing means, andeach of the runners of the forming mold is formed in the parting surface and is tilted with respect to the pressing direction of the pressing means so as to spread apart from the inlet toward its outlet guided to the cavity.
- The mold forming apparatus according to claim 1, wherein the runners extend from the inlets and branch off in an intermediate portion on a downstream side being allowed to obtain the plurality of the outlets guided to the cavity.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL14857419T PL3064292T3 (en) | 2013-10-30 | 2014-09-17 | Mold shaping device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2013225382A JP5854525B2 (en) | 2013-10-30 | 2013-10-30 | Mold making equipment |
PCT/JP2014/074549 WO2015064236A1 (en) | 2013-10-30 | 2014-09-17 | Mold shaping device |
Publications (3)
Publication Number | Publication Date |
---|---|
EP3064292A1 true EP3064292A1 (en) | 2016-09-07 |
EP3064292A4 EP3064292A4 (en) | 2017-07-26 |
EP3064292B1 EP3064292B1 (en) | 2018-05-16 |
Family
ID=53003849
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14857419.7A Active EP3064292B1 (en) | 2013-10-30 | 2014-09-17 | Mold shaping device |
Country Status (6)
Country | Link |
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US (1) | US20160228942A1 (en) |
EP (1) | EP3064292B1 (en) |
JP (1) | JP5854525B2 (en) |
CN (1) | CN105705267A (en) |
PL (1) | PL3064292T3 (en) |
WO (1) | WO2015064236A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017181170A1 (en) | 2016-04-15 | 2017-10-19 | Hi-Tech Mold & Engineering, Inc | Die insert for molding a speaker grille |
US10144164B2 (en) | 2016-04-15 | 2018-12-04 | Hi-Tech Mold & Engineering, Inc. | Die insert for molding a speaker grille and method of forming same |
CN110587940B (en) * | 2019-08-23 | 2022-02-18 | 合肥帝品数码科技有限公司 | PVC foaming board extrusion tooling |
JP7310666B2 (en) | 2020-03-16 | 2023-07-19 | トヨタ自動車株式会社 | core molding machine |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1432666A (en) * | 1921-03-21 | 1922-10-17 | Ira A Wyant | Core-box plate |
FR2382293A1 (en) * | 1977-03-02 | 1978-09-29 | Pont A Mousson | MACHINE FOR MANUFACTURING FOUNDRY CORES |
US4135569A (en) * | 1977-07-13 | 1979-01-23 | Acme-Cleveland Corporation | Molding machine clean out |
DE2833999C2 (en) * | 1978-08-03 | 1981-11-19 | Eugen Dipl.-Ing. 8871 Burtenbach Bühler | Method and device for the production of casting molds and cores |
US4239079A (en) * | 1979-05-30 | 1980-12-16 | Joseph Simmons | Sand deflector for automatic molding machine |
JPH04127936A (en) * | 1990-09-19 | 1992-04-28 | Sanyu:Kk | Device for forming core in shell mold |
JPH0747445A (en) * | 1993-08-06 | 1995-02-21 | Honda Motor Co Ltd | Metallic mold casting method |
JPH0929387A (en) * | 1995-07-20 | 1997-02-04 | Aisin Takaoka Ltd | Core die heating and controlling device |
JP3407877B2 (en) * | 2000-03-24 | 2003-05-19 | 新東工業株式会社 | Blow molding machine |
CN1618546A (en) * | 2000-03-21 | 2005-05-25 | 新东工业株式会社 | Casting sand blowing device for molding machines |
US20040031580A1 (en) * | 2002-08-15 | 2004-02-19 | Smith Douglas W. | Contour mold casting method |
WO2005089984A1 (en) | 2004-03-23 | 2005-09-29 | Sintokogio, Ltd. | Casting mold forming apparatus and metal mold unit for use therein |
CN101360574B (en) * | 2005-11-21 | 2010-09-08 | 新东工业株式会社 | Process for making molds |
JP5484502B2 (en) * | 2012-03-13 | 2014-05-07 | リョービ株式会社 | Core manufacturing equipment |
-
2013
- 2013-10-30 JP JP2013225382A patent/JP5854525B2/en active Active
-
2014
- 2014-09-17 WO PCT/JP2014/074549 patent/WO2015064236A1/en active Application Filing
- 2014-09-17 US US14/909,531 patent/US20160228942A1/en not_active Abandoned
- 2014-09-17 PL PL14857419T patent/PL3064292T3/en unknown
- 2014-09-17 EP EP14857419.7A patent/EP3064292B1/en active Active
- 2014-09-17 CN CN201480059833.3A patent/CN105705267A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
WO2015064236A1 (en) | 2015-05-07 |
PL3064292T3 (en) | 2018-09-28 |
EP3064292A4 (en) | 2017-07-26 |
US20160228942A1 (en) | 2016-08-11 |
JP2015085351A (en) | 2015-05-07 |
JP5854525B2 (en) | 2016-02-09 |
EP3064292B1 (en) | 2018-05-16 |
CN105705267A (en) | 2016-06-22 |
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