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US20190111474A1 - Method for molding - Google Patents

Method for molding Download PDF

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Publication number
US20190111474A1
US20190111474A1 US16/087,289 US201716087289A US2019111474A1 US 20190111474 A1 US20190111474 A1 US 20190111474A1 US 201716087289 A US201716087289 A US 201716087289A US 2019111474 A1 US2019111474 A1 US 2019111474A1
Authority
US
United States
Prior art keywords
squeeze
molding
pattern
flask
molding sand
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.)
Abandoned
Application number
US16/087,289
Other languages
English (en)
Inventor
Masahide Noguchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sintokogio Ltd
Original Assignee
Sintokogio Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sintokogio Ltd filed Critical Sintokogio Ltd
Assigned to SINTOKOGIO, LTD. reassignment SINTOKOGIO, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NOGUCHI, MASAHIDE
Publication of US20190111474A1 publication Critical patent/US20190111474A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/28—Compacting by different means acting simultaneously or successively, e.g. preliminary blowing and finally pressing
    • B22C15/30—Compacting by different means acting simultaneously or successively, e.g. preliminary blowing and finally pressing by both pressing and jarring devices
    • 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
    • B22C11/00—Moulding machines characterised by the relative arrangement of the parts of same
    • B22C11/02—Machines in which the moulds are moved during a cycle of successive operations
    • B22C11/08—Machines in which the moulds are moved during a cycle of successive operations by non-rotary conveying means, e.g. by travelling platforms
    • 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
    • B22C11/10—Moulding machines characterised by the relative arrangement of the parts of same with one or more flasks forming part of the machine, from which only the sand moulds made by compacting are removed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/23—Compacting by gas pressure or vacuum
    • B22C15/24—Compacting by gas pressure or vacuum involving blowing devices in which the mould material is supplied in the form of loose particles
    • 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

Definitions

  • the present invention relates to a method for molding by squeezing molding sand that has filled flasks.
  • a molding space is formed as follows: in the portion of a pattern, which portion is high, squeeze feet are lowered to reduce the amount of the molding sand, and in the portion of a pattern, which portion is low, the squeeze feet remain to be lifted so that the amount of the molding sand to be squeezed is large.
  • This process has been publicly known (for example, see Patent Literature 1).
  • the present invention has been conceived to solve that problem. Its aim is to provide a method for molding by which the density of the sand in a mold at the portion of a pattern that is concave on the parting plane is caused to be high, so that the density of the sand in the mold is almost uniform.
  • a method for molding of the present invention is to form a mold by using molding sand wherein a flask and a pattern plate are used. It has a step of forming a molding space by using the flask, using an auxiliary flask that has a lower opening that is connectable to an upper opening of the flask, using a squeeze head that has a squeeze board that can enter and withdraw from the auxiliary flask and has a plurality of squeeze feet that pass through the squeeze board and vertically move in relation to the squeeze board, and using the pattern plate. It also has a step of filling the molding sand into the molding space, which molding sand has been stored in a hopper for filling the molding sand.
  • It also has a step of squeezing the molding sand by lowering the squeeze head.
  • the squeeze feet that face a concavity of a pattern that is formed in the pattern plate are lowered at the same time as the step of squeezing starts, or during the step of squeezing.
  • a pressure for squeezing that is a pressure to squeeze the molding sand is measured. If the measured pressure for squeezing reaches a predetermined pressure, the squeeze feet that face the concavity of the pattern that is formed in the pattern plate start to be lowered.
  • a downward distance of the squeeze head to squeeze the molding sand is measured. If the measured downward distance reaches a predetermined distance, the squeeze feet that face a concavity of the pattern that is formed in the pattern plate start to be lowered.
  • the squeeze feet that face the convexity of the pattern that is formed in the pattern plate are lowered, and then the step of filling is carried out.
  • the step of squeezing is carried out after the squeeze feet that face the convexity of the pattern that is formed in the pattern plate are lifted or while the squeeze feet are being lifted.
  • a frame that encloses, and vertically slides on, the outer circumference of the pattern plate, is used.
  • the molding space is partially formed by means of the frame.
  • the method for molding is to form a mold by molding sand wherein a flask and a pattern plate are used, the method comprising the steps of 1) forming a molding space by using the flask, an auxiliary flask that has a lower opening that is connectable to an upper opening of the flask, a squeeze head that has a squeeze board that can enter and withdraw from the auxiliary flask and a plurality of squeeze feet that pass through the squeeze board and vertically move in relation to the squeeze board, and the pattern plate, 2) filling the molding sand that has been stored in a hopper for filling the molding sand into the molding space, and 3) squeezing the molding sand by lowering the squeeze head, wherein the squeeze feet that face a concavity of a pattern that is formed in the pattern plate are lowered at the same time as the step of squeezing starts or during the step of squeezing, various advantages can be achieved, such that the density of the sand in the mold
  • FIG. 1 is a schematic sectional view of the configuration of the embodiment of the present invention when a molding space is formed.
  • FIG. 2 is a schematic sectional view of the configuration of the embodiment of the present invention when the squeeze feet that face a convexity of the pattern are lowered to a predetermined position.
  • FIG. 3 is a schematic sectional view of the configuration of the embodiment of the present invention when the molding sand is subject to aeration.
  • FIG. 4 is a schematic sectional view of the configuration of the embodiment of the present invention when the squeeze feet that face the convexity of the pattern are lifted to an upper end.
  • FIG. 5 is a schematic sectional view of the configuration of the embodiment of the present invention when squeezing the molding sand is completed.
  • FIG. 6 is a sectional view of a flask in which a mold is formed.
  • FIG. 7 is a schematic sectional view of the configuration of the embodiment of the present invention when a molding space is formed by using another pattern carrier.
  • FIG. 1 is a schematic sectional view of the embodiment to show a portion for filling the molding sand and a portion for squeezing the molding sand of the molding machine.
  • the portions of the molding machine other than the portion for filling the molding sand and the portion for squeezing the molding sand of the molding machine are omitted.
  • a pattern plate 2 for the upper flask is detachably attached to a carrier 1 for the pattern.
  • the outer circumference of the pattern plate 2 is surrounded by the carrier 1 for the pattern.
  • the flask 3 is mounted on the carrier 1 for the pattern (the pattern plate 2 ).
  • the flask 3 is conveyed into and out of the molding machine by a conveyor for carrying the flask in and out, which is not shown.
  • the flask 3 is vertically moved by a means for vertically moving the flask, which is also not shown.
  • An auxiliary flask 4 adheres to the flask 3 under a pushing force.
  • the auxiliary flask 4 has a lower opening 4 a that is connectable to an upper opening 3 a of the flask 3 .
  • the auxiliary flask 4 is vertically moved by a means for vertically moving an auxiliary flask, which is not shown.
  • the auxiliary flask 4 is equipped with an encoder, which is not shown, so that the vertical distance of the auxiliary flask 4 is measured by the encoder.
  • FIG. 1 shows the status in which the upper opening 3 a of the flask 3 is connected to the lower opening 4 a of the auxiliary flask 4 .
  • the lower end of the hopper 5 for filling the molding sand that stores the molding sand S (green sand in this embodiment) is inserted into the auxiliary flask 4 .
  • a squeeze head 6 is attached to the lower end of the hopper 5 for filling the molding sand to be inserted into the auxiliary flask 4 .
  • the squeeze head 6 has a squeeze board 7 that vertically moves within the auxiliary flask 4 and has a plurality of segment-type squeeze feet 8 that pass through the squeeze board 7 and that vertically move in relation to the squeeze board 7 .
  • the plurality of squeeze feet 8 are driven by an oil cylinder.
  • a port 10 for supplying the molding sand is formed at the top of the hopper 5 for filling the molding sand.
  • the port 10 is closed by a sliding gate 9 .
  • a pipe 12 for supplying air which introduces air at a low pressure (e.g., 0.05-0.18 MPa), is connected to the upper portion of the hopper 5 for filling the molding sand through an on-off valve 11 .
  • the lower portion of the hopper 5 for filling the molding sand is formed by a bifurcated bifurcating chute 13 .
  • On the inner surface of the hopper 5 for filling the molding sand many apertures 14 for ejecting air are provided that connect to a source of compressed air, which is not shown, through an on-off valve, which is not shown.
  • Air at a low pressure (e.g., 0.05-0.18 MPa) is ejected from the many apertures 14 for ejecting air into the hopper 5 for filling the molding sand to form the aeration by which the molding sand S is floated and fluidized.
  • a port 15 for filling the molding sand is provided to downwardly feed the molding sand S in the chute 13 .
  • Nozzles 16 for filling the molding sand are formed at both sides of the squeeze feet 8 of the squeeze board 7 so as to feed the molding sand S to a molding space below the squeeze board 7 .
  • the nozzles 16 for filling the molding sand are connected to the respective ports 15 for filling the molding sand.
  • the hopper 5 for filling the molding sand and the squeeze head 6 which is attached to the bottom of the hopper 5 , are vertically moved by means for vertically moving the hopper for filling the molding sand (an oil cylinder in this embodiment), which is not shown.
  • a convexity 2 a of the pattern and a concavity 2 b of the pattern are formed in the pattern plate 2 .
  • the convexity of the pattern is the part of the pattern that is higher than the level of the parting plane 2 c of the pattern plate 2 .
  • the concavity of the pattern is the part of the pattern that is lower than the level of the parting plane 2 c of the pattern plate 2 .
  • FIG. 1 shows a state where a molding space is formed by means of the flask 3 , the auxiliary flask 4 , the squeeze head 6 , and the pattern plate 2 .
  • the squeeze feet 8 that face the convexity 2 a of the pattern formed in the pattern plate 2 are lowered to a predetermined position, to be in a state as in FIG. 2 .
  • the amount of the molding sand S that is to be squeezed by the squeeze feet 8 that face the convexity 2 a of the pattern is reduced.
  • a preferable molding space is formed.
  • air at a low pressure is ejected through the many apertures 14 for ejecting air to the hopper 5 for filling the molding sand.
  • the aeration is carried out where the molding sand S in the hopper 5 for filling the molding sand is floated and fluidized. While the aeration is carried out, air at the low pressure is supplied from the pipe 12 for supplying air to the hopper 5 for filling the molding sand through the on-off valve 11 .
  • the molding sand S is filled by the aeration by means of the air at the low pressure in the molding space through the port 15 for filling the molding sand and the nozzle 16 for filling the molding sand, as in FIG. 3 .
  • the air that is used for filling by the aeration is discharged through vent holes in the auxiliary flask 4 , which vent holes are not shown.
  • the squeeze feet 8 that face the convexity 2 a of the pattern are lifted to the upper end.
  • a vacant portion 17 which is a space where there is no molding sand S, is formed in the molding space.
  • the hopper 5 for filling the molding sand and the squeeze head 6 are lowered by a means for vertically moving the hopper for filling the molding sand so that the molding sand S in the molding space is squeezed by means of the squeeze board 7 and the plurality of the squeeze feet 8 .
  • the squeeze feet 8 that face the concavity 2 b of the pattern that is formed in the pattern plate 2 are lowered, so that the molding sand S in the concavity 2 b of the pattern is partially squeezed (see FIG. 5 ).
  • the vacant portion 17 disappears as the squeeze feet 8 are lowered to squeeze.
  • the hopper 5 for filling the molding sand and the squeeze head 6 are lifted by the means for vertically moving the hopper for filling the molding sand, so that the squeeze head 6 is separated from the flask 3 in which the mold is molded.
  • the squeeze feet 8 that face the concavity 2 b of the pattern are lifted as high as possible.
  • the auxiliary flask 4 is lifted by the means for vertically moving the auxiliary flask, so that the auxiliary flask 4 is separated from the flask 3 .
  • the flask is lifted by the means for vertically moving the flask, so that the mold is drawn out of the flask.
  • the flask 3 is separated from the pattern plate 2 .
  • the flask 3 in which the mold is molded is carried out by means of the conveyor for carrying the flask in and out. Then an empty flask 3 is conveyed.
  • the flask 3 in which the mold has been molded is shown in FIG. 6 .
  • the pattern plate 2 and the carrier 1 for the pattern are carried out of the molding machine by means of a device for changing a pattern, which is not shown.
  • a pattern plate for a lower flask, which is not shown, and the pattern carrier, are carried in the molding machine.
  • the empty flask 3 is lowered by the means for vertically moving the flask to be placed on a pattern plate (a pattern carrier) for a lower flask.
  • the auxiliary flask 4 is lowered by the means for vertically moving the auxiliary flask, to adhere to the flask 3 under a pushing force.
  • the hopper 5 for filling the molding sand and the squeeze head 6 are lowered by the means for vertically moving the hopper for filling the molding sand, so that the squeeze head 6 is inserted into the auxiliary flask 4 . In this way the molding space is again formed. The above-mentioned operation is repeated.
  • the pressure to lower the squeeze feet 8 that face the concavity 2 b of the pattern that is formed in the pattern plate 2 can be changed to a desired pressure, namely, it is adjustable.
  • the pressure to lower these squeeze feet 8 can be set to be low in comparison with the normal pressure, so that any defect can be prevented when the concavity 2 b of the pattern is removed. This is an advantage.
  • the pressure to lower these squeeze feet 8 is set to be a pressure that is lower than the designed pressure (for example, one-half of the designed pressure), so that the resistance in removing the concavity 2 b of the pattern from the mold in a vertical direction is reduced.
  • the designed pressure for example, one-half of the designed pressure
  • the pressure for squeezing the molding sand S by lowering the squeeze head 6 is measured. If the measured pressure reaches the set pressure, the squeeze feet 8 that face the concavity 2 b of the pattern that is formed in the pattern plate 2 start to be lowered.
  • the molding sand S may not be sufficiently squeezed, depending on the shape of the pattern. If it were to be too late, the molding sand S would not have been squeezed by lowering the squeeze feet 8 , since to some extent it had already been squeezed.
  • the squeeze feet 8 that face the concavity 2 b of the pattern can start to be lowered at an appropriate time. This is an advantage.
  • the pressure for squeezing the molding sand S by lowering the squeeze head 6 acts as a pressure to lower the means for vertically moving the hopper for filling the molding sand in order to squeeze the molding sand S.
  • the time for starting to lower the squeeze feet 8 that face the concavity 2 b of the pattern is determined as above.
  • the configuration is not limited to this one.
  • the downward distance of the squeeze head 6 to squeeze the molding sand S is measured.
  • the squeeze feet 8 that face the concavity 2 b of the pattern that is formed in the pattern plate 2 may start to be lowered.
  • an encoder which is not shown, is attached to the hopper 5 for filling the molding sand to measure the downward distance of the squeeze head 6 .
  • the squeeze feet 8 that face the convexity 2 a of the pattern that is formed in the pattern plate 2 are lowered, and then the molding sand S fills the molding space.
  • this step need not be carried out. Namely, it is not mandatory.
  • the squeeze feet 8 that face the convexity 2 a of the pattern are not lowered, no step of lifting them is carried out.
  • the squeeze feet 8 that face the convexity 2 a of the pattern that is formed in the pattern plate 2 is lifted, and then the squeeze head 6 is lowered to squeeze the molding sand S.
  • a vacant portion 17 that is a part of the molding space where there is no molding sand S can be formed as in FIG. 4 .
  • the amount of the molding sand S that is to be squeezed on the convexity 2 a of the pattern is reduced.
  • the squeeze feet 8 that face the concavity 2 b of the pattern are lowered, the molding sand S on the concavity 2 b of the pattern is easily squeezed. This is an advantage.
  • the squeeze head 6 is lowered to squeeze the molding sand S.
  • the configuration is not limited to this one.
  • the squeeze head 6 may be lowered to squeeze the molding sand S.
  • the carrier 1 for the pattern is not limited to the above-mentioned one. Now another embodiment of the carrier for the pattern is discussed.
  • FIG. 7 shows that a molding space is formed by using another carrier 18 for the pattern.
  • the carrier 18 for the pattern has a frame 19 that surrounds the outer circumference of the pattern plate 2 and vertically slides on it.
  • Multiple guiding pins 20 are connected to the bottom of the frame 19 .
  • the guiding pins 20 are vertically and slidably inserted into the main frame 21 .
  • the frame 19 is vertically moved through the guiding pin 20 by means of a vertical cylinder, which is not shown.
  • the upper surface of the frame 19 slightly projects (e.g., 30 mm) from the parting plane 2 c of the pattern plate 2 when the vertical cylinder is extended to its maximum (see FIG. 7 ).
  • the upper surface of the frame 19 is almost on the same plane as the parting plane 2 c of the pattern plate 2 when the vertical cylinder is retracted.
  • the carrier 18 for the pattern has the frame 19 that surrounds the outer circumference of the pattern plate 2 and vertically slides on it.
  • the molding space is partially formed by the frame 19 .
  • the nozzles 16 for filling the molding sand are formed at both sides of the plurality of the squeeze feet 8 of the squeeze board 7 .
  • the configuration is not limited to this one.
  • the nozzles 16 for filling the molding sand may be formed to pass though the sides of the auxiliary flask 4 .
  • the bifurcated chute 13 which is the lower part of the hopper 5 for filling the molding sand, may be located outside of the auxiliary flask 4 and may be fixed to it.
  • the port 15 for filling the molding sand that is provided at the bottom of the chute 13 can be connected to the nozzle 16 for filling the molding sand that is formed in the side of the auxiliary flask 4 .
  • the squeeze head 6 can be vertically moved by means of another actuator.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
US16/087,289 2016-07-20 2017-03-16 Method for molding Abandoned US20190111474A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2016142452 2016-07-20
JP2016-142452 2016-07-20
PCT/JP2017/010595 WO2018016123A1 (ja) 2016-07-20 2017-03-16 鋳型造型方法

Publications (1)

Publication Number Publication Date
US20190111474A1 true US20190111474A1 (en) 2019-04-18

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ID=60993294

Family Applications (1)

Application Number Title Priority Date Filing Date
US16/087,289 Abandoned US20190111474A1 (en) 2016-07-20 2017-03-16 Method for molding

Country Status (8)

Country Link
US (1) US20190111474A1 (es)
EP (1) EP3488945B1 (es)
JP (1) JP6665935B2 (es)
KR (1) KR20190027777A (es)
CN (1) CN109195729B (es)
BR (1) BR112018074860A2 (es)
MX (1) MX2018014692A (es)
WO (1) WO2018016123A1 (es)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110756747B (zh) * 2019-11-29 2020-11-17 安庆海威尔机械有限公司 活塞环砂型成型方法
CN112828248A (zh) * 2021-02-22 2021-05-25 临沂市卓杰机械有限公司 预压结构及射砂机

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0422535A (ja) * 1990-05-15 1992-01-27 Mazda Motor Corp 鋳型の造型方法
JP3083042B2 (ja) * 1994-05-12 2000-09-04 新東工業株式会社 鋳型造型方法
JP3252632B2 (ja) * 1994-12-28 2002-02-04 日産自動車株式会社 鋳造用砂型の造型方法および造型装置
JP2001038451A (ja) 1999-07-28 2001-02-13 Sintokogio Ltd 鋳物砂の充填方法及びその装置並びに主型造型方法及びその装置
JP3413798B2 (ja) * 2000-01-14 2003-06-09 新東工業株式会社 枠付造型装置の造型方法及び造型システム
EP1240957B1 (en) * 2001-03-16 2007-01-03 Sintokogio, Ltd. Method and apparatus for compacting molding sand
JP3802358B2 (ja) * 2001-03-16 2006-07-26 新東工業株式会社 鋳物砂の圧縮方法および鋳物砂の造型方法
JP3595320B2 (ja) * 2002-07-22 2004-12-02 メタルエンジニアリング株式会社 鋳型造型方法および装置並びにその使用方法
JP2005152938A (ja) * 2003-11-25 2005-06-16 Aisin Takaoka Ltd 鋳型造型機
US7726380B2 (en) * 2004-04-21 2010-06-01 Sintokogio, Ltd. Method for manufacturing sand mold
JP4379795B2 (ja) * 2004-04-21 2009-12-09 新東工業株式会社 鋳物砂の充填方法
CN101811176B (zh) * 2009-12-04 2012-11-14 新东工业株式会社 铸型造型装置以及铸型造型方法

Also Published As

Publication number Publication date
BR112018074860A2 (pt) 2019-03-06
MX2018014692A (es) 2019-02-28
WO2018016123A1 (ja) 2018-01-25
JPWO2018016123A1 (ja) 2019-05-09
CN109195729B (zh) 2021-03-12
CN109195729A (zh) 2019-01-11
EP3488945A1 (en) 2019-05-29
EP3488945B1 (en) 2020-08-19
KR20190027777A (ko) 2019-03-15
JP6665935B2 (ja) 2020-03-13
EP3488945A4 (en) 2019-12-04

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