WO2023214452A1 - 低圧鋳造装置 - Google Patents

低圧鋳造装置 Download PDF

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Publication number
WO2023214452A1
WO2023214452A1 PCT/JP2022/019520 JP2022019520W WO2023214452A1 WO 2023214452 A1 WO2023214452 A1 WO 2023214452A1 JP 2022019520 W JP2022019520 W JP 2022019520W WO 2023214452 A1 WO2023214452 A1 WO 2023214452A1
Authority
WO
WIPO (PCT)
Prior art keywords
mold
lower mold
main part
low
pressure casting
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.)
Ceased
Application number
PCT/JP2022/019520
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
誠吾 庄禮
儀一郎 岡村
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.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co 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 Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Priority to US18/861,623 priority Critical patent/US12605760B2/en
Priority to JP2024519154A priority patent/JP7750401B2/ja
Priority to PCT/JP2022/019520 priority patent/WO2023214452A1/ja
Priority to CN202280095491.5A priority patent/CN119095680B/zh
Priority to EP22940505.5A priority patent/EP4520455B1/en
Publication of WO2023214452A1 publication Critical patent/WO2023214452A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould

Definitions

  • the present invention relates to improvements in low pressure casting equipment.
  • Patent Document 1 As a conventional low-pressure casting device, there is one described in Patent Document 1, for example.
  • the low-pressure casting apparatus described in Patent Document 1 includes a lower mold placed on a holding furnace, an upper mold that can be raised and lowered relative to the lower mold, and a plurality of horizontal molds that can be moved forward and backward with respect to the center of the mold on the lower mold. We are prepared.
  • the low-pressure casting device forms a cavity between a lower mold, a lowered upper mold, and an advanced horizontal mold.
  • the lower mold has a sprue portion that communicates with the stalk.
  • the low-pressure casting device pressurizes the inside of the holding furnace, thereby passing the molten metal inside the holding furnace through the stalk and the sprue to fill the cavity. After that, the low-pressure casting device opens the mold and releases the cast product after the molten metal in the cavity is cooled and solidified.
  • a guide column is arranged in the lower mold to regulate the forward position of the horizontal mold, and the temperature of the lower mold with the sprue is relative to that of the lower mold. become higher. Therefore, in the conventional low-pressure casting apparatus, the lower mold tends to undergo thermal expansion in the horizontal direction, and when thermal expansion occurs, the position of the guide column is displaced toward the outside of the mold, and the forward movement position of the horizontal mold is shifted toward the front. As a result, in the conventional low-pressure casting apparatus, there is a possibility that a gap exceeding the clearance may be generated between the upper mold and the horizontal mold, and it has been a challenge to solve such problems.
  • the present invention has been achieved by focusing on the above-mentioned conventional problems, and can improve mold closing accuracy by preventing excessive gaps between molds caused by thermal expansion of the lower mold.
  • the purpose is to provide a low pressure casting device.
  • a low-pressure casting apparatus includes a lower mold placed on a holding furnace, an upper mold that can be raised and lowered relative to the lower mold, and a plurality of side molds placed on the lower mold. , and form a cavity between the side molds.
  • the lower mold includes a lower mold main part that forms the inner bottom surface of the cavity, and a lower mold base part that holds the lower mold main part.
  • the main part of the lower mold has a sprue bush that opens into the cavity.
  • At least one of the side molds is movable forward and backward with respect to the center of the mold, and the lower mold base portion has a guide column that regulates the forward position of the movable side mold.
  • the low-pressure casting apparatus is characterized in that a horizontal adjustment gap is provided between the lower mold main part and the lower mold base part.
  • the low-pressure casting apparatus having the above configuration, during casting, the temperature of the main part of the lower mold having the sprue bush becomes relatively high, and thermal expansion mainly occurs in the horizontal direction.
  • the lower mold is divided into the main part of the lower mold and the base part of the lower mold, and an adjustment gap is provided between the two, so the thermal expansion of the main part of the lower mold is controlled by the adjustment gap. to suppress thermal deformation of the lower mold base.
  • the low-pressure casting equipment prevents the guide column from displacing at the lower die base, secures the correct forward position of the side die that can move forward and backward, and prevents the gap between the side die and the upper die from being larger than the clearance. prevent this from occurring.
  • the low-pressure casting apparatus according to the present invention can prevent an excessive gap between molds caused by thermal expansion of the lower mold, and can improve mold closing accuracy.
  • FIG. 2 is a plan view of a lower mold showing an open state in the first embodiment of the low-pressure casting apparatus according to the present invention.
  • FIG. 3 is a vertical cross-sectional view showing the mold in an open state.
  • FIG. 2 is a plan view of the lower mold showing the mold closed state following FIG. 1 .
  • FIG. 3 is a vertical sectional view following FIG. 2 and showing the mold closed state.
  • FIG. 7 is a vertical cross-sectional view showing the mold open state in a second embodiment of the low-pressure casting apparatus according to the present invention. It is a top view of the lower mold which shows a mold opening state.
  • FIG. 6 is a vertical sectional view following FIG. 5 and showing the mold closed state.
  • FIG. 7 is a vertical cross-sectional view showing the mold closed state in a third embodiment of the low-pressure casting apparatus according to the present invention.
  • FIG. 9 is an explanatory circuit diagram showing a suction mechanism of the low-pressure casting apparatus shown in FIG. 8;
  • the low-pressure casting apparatus shown in FIGS. 1 and 2 includes a lower mold 1 placed on a holding furnace 50, an upper mold 2 that can be raised and lowered relative to the lower mold 1, and a plurality of molds (the illustrated example is 4) side molds 3 to 6. As shown in FIGS. 3 and 4, the low-pressure casting apparatus forms a cavity 7, which is a casting space, between the lower mold 1, the upper mold 2, and the plurality of side molds 3 to 6. Note that in FIGS. 2 and 4, only the side molds 3 and 5 arranged on the left and right sides in the figures are shown.
  • the holding furnace 50 is a well-known type that stores molten metal and is equipped with a stalk serving as a filling path for the molten metal, an internal pressurizing mechanism, and the like.
  • the lower mold 1 includes a lower mold main part 1A that forms the inner bottom surface of the cavity 7, and a lower mold base part (die base) 1B that holds the lower mold main part 1A.
  • the main part 1A of the lower mold in the illustrated example has a square shape in plan view, and four sprue bushes 8 are arranged vertically and horizontally in the center thereof. Each sprue bush 8 communicates with the stalk of the holding furnace 50 at its lower end, and opens into the cavity 7 at its upper end.
  • the lower mold main part 1A has a downward step on its outer periphery
  • the lower mold base part 1B has an upward step on the inner periphery of the housing part of the lower mold main part 1A.
  • the two stepped portions are engaged with each other. Thereby, the lower mold main part 1A and the lower mold base part 1B are combined so that their upper surfaces are continuous in the same plane, and a horizontal adjustment gap S is provided between them.
  • the upper mold 2 integrally includes an upper mold main part 2A that forms the inner upper surface of the cavity 7 and an upper mold base part 2B, and can be raised and lowered by a drive mechanism (not shown), and the upper mold main part 2A is moved up and down by a drive mechanism (not shown).
  • a mold release plate 9 is provided with a plurality of mold release pins 9A penetrating vertically. This mold release plate 9 can be raised and lowered by a drive mechanism different from the drive mechanism for the upper mold.
  • At least one of the side molds 3 to 6 of the low-pressure casting apparatus according to the present invention can move forward and backward with respect to the center of the mold.
  • the side molds 3 to 6 in the illustrated example have side mold main parts 3A to 6A forming the inner side surface of the cavity 7, and plates 3B to 6B arranged on the back side thereof, and are arranged in four directions with respect to the cavity 7. Both can be moved forward and backward relative to the center of the mold by a drive mechanism (not shown).
  • These side molds 3 to 6 are arranged at positions corresponding to each side of the main part 1A of the square lower mold.
  • the lower mold base portion 1B of the lower mold 1 has a side that can move forward and backward at a position between the adjacent side molds 3 to 6 on the outside of the four corners of the square-shaped lower mold main portion 1A. It has a guide column 10 that regulates the forward position of the molds 3 to 6.
  • This guide column 10 is designed to allow the plates 3B to 6B of the side molds 3 to 6 to come into contact with each other as shown in FIG. 3 when the side molds 3 to 6 are advanced toward the center of the mold from the state shown in FIG. , regulates the forward position of each side mold 3 to 6.
  • the low-pressure casting apparatus having the above configuration is constructed by moving the side molds 3 to 6 forward and lowering the upper mold 2 from the mold open state shown in FIGS. 1 and 2, as shown in FIGS. 3 and 4.
  • the low-pressure casting apparatus appropriately pressurizes the holding furnace 50 and depressurizes the cavity 7 to fill the cavity 7 with the molten metal in the holding furnace 50 through the stalk and each sprue bush 8.
  • the mold is opened as shown in FIGS. 1 and 2, the mold release plate 9 is lowered relative to the upper mold 2, and the mold release pin 9A is projected from the upper mold 2 to release the cast product. Make a mold.
  • the low-pressure casting device divides the lower mold 1 into a lower mold main part 1A and a lower mold base part 1B, and provides an adjustment gap S between the two, so that the lower mold main part 1A Thermal expansion can be absorbed by the adjustment gap S, thereby suppressing thermal deformation of the lower die base portion 1B.
  • the low-pressure casting apparatus prevents the guide columns 10 from displacing in the lower mold base portion 1B, secures the correct forward position of the side molds 3 to 6 that can move forward and backward by these guide struts 10, and moves the lower mold 1
  • An excessive gap larger than the clearance should not be created between the side molds 3 to 6 and between the side molds 3 to 6 and the upper mold 2.
  • the low-pressure casting apparatus can prevent an excessive gap between the molds caused by thermal expansion of the lower mold 1, and can improve mold closing accuracy.
  • the low-pressure casting apparatus can improve the dimensional accuracy of the cast product as the mold closing accuracy improves, and can reduce sticking defects, especially in casting using aluminum as the material.
  • FIGS. 5 to 9 are diagrams illustrating second and third embodiments of the low-pressure casting apparatus according to the present invention.
  • the same reference numerals are given to the same components as in the first embodiment, and detailed description thereof will be omitted.
  • the low-pressure casting apparatus shown in FIGS. 5 and 6 includes a plurality of sets (two sets in the illustrated example) of a lower mold 1, an upper mold 2, and a plurality of side molds 3 to 6.
  • the lower mold 1 has two lower mold main parts 1A, but the lower mold base part 1A is common.
  • the upper mold 2 is divided into an upper mold main part 2A forming the inner upper surface of the cavity 7 and an upper mold base part 2B. It is held so that it can reciprocate in the arrangement direction of ⁇ 6.
  • the main part 2A of the upper mold in the illustrated example is capable of reciprocating in the direction in which the side molds 3 and 5 are arranged, which is the left-right direction in the figure.
  • the upper mold main part 2A is connected to the upper mold base part 2B by a slidable uneven structure such as grooves and protrusions or by an elastic body.
  • the reciprocating range of the upper mold main part 2A may be within a range that allows the mold to be closed.
  • the upper mold main part 2B has a hole through which the release pin 9A is inserted so as to have an elongated cross section in order to allow relative movement with the release pin 9A.
  • the low pressure casting apparatus includes a center base 11 that positions at least one of the side molds.
  • the center base 11 is a structure extending from between the two upper mold base parts 2B and 2B to the lower mold 1, and includes two side molds 3 and 5 whose back surfaces face each other, that is, the right side in FIG.
  • the right side mold 5 in the group and the left side mold 3 in the left group in the figure are positioned.
  • center base 11 may be raised and lowered by a drive mechanism (not shown), and positioning in the horizontal direction is achieved by engaging the concave portion 11A provided at the lower end with the convex portion 1C of the lower mold base portion 1B. be done.
  • the center base 11 and the side molds 5 and 3 positioned by the center base 11 are separated so that an adjustment shim 12 can be inserted therebetween. That is, the center base 11 and the side molds 3 and 5 have flat surfaces that face each other, and the flat adjustment shim 12 can be interposed between the facing surfaces.
  • the above-mentioned center base 11 can also constitute a center type including the side types 3 and 5.
  • the side molds 3 and 5 correspond to the main parts (3A, 5A) of the side molds forming the inner side surface of the cavity 7, and the center base 11 corresponds to the center Corresponds to the mold base.
  • the center mold is divided into the side mold main parts (3, 5) and the center mold base part (11), and the structure allows the adjustment shim 12 to be interposed between the two parts.
  • the low-pressure casting apparatus uses the adjustment gap S provided between the lower mold main parts 1A, 1A and the lower mold base part 1B in the lower mold 1 to provide a lower mold main part 1B. It absorbs the thermal expansion of the parts 1A, 1A, suppresses the thermal expansion of the lower mold base part 1B, and prevents the position of the guide column 10 and the forward positions of the side molds 3, 4, 6, which can move back and forth, from shifting. Therefore, it is possible to maintain good mold closing accuracy.
  • the above-mentioned low-pressure casting apparatus divides the upper mold 2 into an upper mold main part 2A and an upper mold base part 2B, and presses the upper mold base part 2B against the center base 11, while the lower mold main part 2A It is capable of reciprocating relative to the upper die base portion 2B.
  • each upper mold main part 2A can move in the opposite direction (arrow direction) with respect to the center base 11 when the mold is closed.
  • the portion 2A can be corrected to the correct mold closing position, and mold closing accuracy can be further improved.
  • the above-mentioned low-pressure casting apparatus can adjust the positions of the side molds 3 and 5 by employing a center base 11 for positioning the two side molds 3 and 5 and an adjustment shim 12, and furthermore, Since the other side molds and the main part 2A of the upper mold are closed based on the fixed side molds 3 and 5, it is possible to further improve mold closing accuracy.
  • center base 11 in the low-pressure casting apparatus eliminates the need for a drive mechanism for the side molds 3 and 5 for positioning. Miniaturization can be achieved.
  • the low-pressure casting apparatus shown in FIG. 8 has the same basic configuration as the second embodiment (FIGS. 5 to 7). It has an exhaust path P1 for discharging the air, and a suction mechanism 60 that sucks the air inside the cavity 7 to the outside through the exhaust path P.
  • the suction mechanism 60 has two exhaust pipes 61A and 61B connected to each set of exhaust passages P of the low-pressure casting apparatus.
  • Each exhaust pipe 61A, 61B is connected to a suction source 62 consisting of a vacuum pump or a vacuum tank, and pressure adjustment valves V1, V2 and exhaust valve V3 are provided in between, and the pressure gauges of each cavity 7, 7
  • the suction source 62 and each valve V1 to V3 are controlled based on the measured values of M1 and M2.
  • the low-pressure casting apparatus with the above configuration has good mold closing accuracy, so the general clearance between the molds and the exhaust path P differentiation is possible.
  • the low-pressure casting device has no unnecessary gaps between the molds, so the air inside the cavity 7 can be effectively sucked and discharged using the exhaust path P, and the entire casting device can be housed in a large casing.
  • the degree of vacuum in the cavity 7 can be increased without surrounding it with the body.
  • the low-pressure casting apparatus enables low-pressure casting using a multi-cavity mold, and can successfully produce thin-walled castings.
  • the configuration of the low-pressure casting apparatus according to the present invention is not limited to the above-mentioned embodiments, and can be modified as appropriate without departing from the gist of the present invention. Casting using a core, etc. Of course, it is also applicable to

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
PCT/JP2022/019520 2022-05-02 2022-05-02 低圧鋳造装置 Ceased WO2023214452A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US18/861,623 US12605760B2 (en) 2022-05-02 2022-05-02 Low-pressure casting apparatus
JP2024519154A JP7750401B2 (ja) 2022-05-02 2022-05-02 低圧鋳造装置
PCT/JP2022/019520 WO2023214452A1 (ja) 2022-05-02 2022-05-02 低圧鋳造装置
CN202280095491.5A CN119095680B (zh) 2022-05-02 2022-05-02 低压铸造装置
EP22940505.5A EP4520455B1 (en) 2022-05-02 2022-05-02 Low-pressure casting apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/019520 WO2023214452A1 (ja) 2022-05-02 2022-05-02 低圧鋳造装置

Publications (1)

Publication Number Publication Date
WO2023214452A1 true WO2023214452A1 (ja) 2023-11-09

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Application Number Title Priority Date Filing Date
PCT/JP2022/019520 Ceased WO2023214452A1 (ja) 2022-05-02 2022-05-02 低圧鋳造装置

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US (1) US12605760B2 (https=)
EP (1) EP4520455B1 (https=)
JP (1) JP7750401B2 (https=)
CN (1) CN119095680B (https=)
WO (1) WO2023214452A1 (https=)

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JPH01109357U (https=) * 1988-01-08 1989-07-24
JPH0447838U (https=) * 1990-08-31 1992-04-23
JP2001286984A (ja) * 2000-04-10 2001-10-16 Honda Motor Co Ltd 鋳造用金型装置
JP2007050435A (ja) * 2005-08-19 2007-03-01 Toyota Motor Corp 鋳造用金型
JP2007319891A (ja) 2006-05-31 2007-12-13 Toyota Motor Corp 低圧鋳造装置
JP2013086118A (ja) * 2011-10-17 2013-05-13 Honda Motor Co Ltd 金型位置決め機構
US20150343520A1 (en) * 2014-05-27 2015-12-03 Honda Motor Co., Ltd. Cylinder head casting apparatus and methods
JP2016215243A (ja) * 2015-05-21 2016-12-22 日産自動車株式会社 鋳造装置の溶湯充填制御方法
JP2020006375A (ja) * 2018-07-03 2020-01-16 日産自動車株式会社 鋳造用金型装置および低圧鋳造方法

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US4824351A (en) * 1987-10-14 1989-04-25 Matrix Technologies, Incorporated Molding and gauging system
JP3808167B2 (ja) * 1997-05-01 2006-08-09 Ｙｋｋ株式会社 金型で加圧鋳造成形された非晶質合金成形品の製造方法及び装置
JP4430412B2 (ja) * 2004-01-21 2010-03-10 ヤマハ発動機株式会社 鋳造機
CN201677021U (zh) * 2010-03-01 2010-12-22 何灿东 低压铸造轮毂模具
CN203508996U (zh) * 2013-09-04 2014-04-02 广东中兴液力传动有限公司 一种液力偶合器叶轮低压铸造模具
WO2016185610A1 (ja) * 2015-05-21 2016-11-24 日産自動車株式会社 鋳造装置の圧力制御方法
KR101909854B1 (ko) 2015-05-29 2018-10-18 닛산 지도우샤 가부시키가이샤 실린더 헤드의 주조 장치 및 실린더 헤드의 주조 방법
CN205496515U (zh) * 2016-04-21 2016-08-24 江苏新安驰铝业有限公司 一种通盘轮毂铸造模具
CN211000145U (zh) * 2019-08-30 2020-07-14 山东泰开精密铸造有限公司 低压模具结构
CN110695339B (zh) * 2019-10-12 2021-09-03 保定市立中车轮制造有限公司 一种五开式边模轮毂铸造模具

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01109357U (https=) * 1988-01-08 1989-07-24
JPH0447838U (https=) * 1990-08-31 1992-04-23
JP2001286984A (ja) * 2000-04-10 2001-10-16 Honda Motor Co Ltd 鋳造用金型装置
JP2007050435A (ja) * 2005-08-19 2007-03-01 Toyota Motor Corp 鋳造用金型
JP2007319891A (ja) 2006-05-31 2007-12-13 Toyota Motor Corp 低圧鋳造装置
JP2013086118A (ja) * 2011-10-17 2013-05-13 Honda Motor Co Ltd 金型位置決め機構
US20150343520A1 (en) * 2014-05-27 2015-12-03 Honda Motor Co., Ltd. Cylinder head casting apparatus and methods
JP2016215243A (ja) * 2015-05-21 2016-12-22 日産自動車株式会社 鋳造装置の溶湯充填制御方法
JP2020006375A (ja) * 2018-07-03 2020-01-16 日産自動車株式会社 鋳造用金型装置および低圧鋳造方法

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Publication number Publication date
EP4520455A1 (en) 2025-03-12
US12605760B2 (en) 2026-04-21
EP4520455A4 (en) 2025-07-02
JP7750401B2 (ja) 2025-10-07
EP4520455B1 (en) 2026-02-11
CN119095680A (zh) 2024-12-06
JPWO2023214452A1 (https=) 2023-11-09
CN119095680B (zh) 2025-11-11
US20250256326A1 (en) 2025-08-14

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