JPH0352757A - Method for removing core - Google Patents
Method for removing coreInfo
- Publication number
- JPH0352757A JPH0352757A JP18699089A JP18699089A JPH0352757A JP H0352757 A JPH0352757 A JP H0352757A JP 18699089 A JP18699089 A JP 18699089A JP 18699089 A JP18699089 A JP 18699089A JP H0352757 A JPH0352757 A JP H0352757A
- Authority
- JP
- Japan
- Prior art keywords
- core
- air
- baseboard
- organic binder
- print part
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000011230 binding agent Substances 0.000 claims abstract description 23
- 239000007789 gas Substances 0.000 claims abstract description 20
- 239000000567 combustion gas Substances 0.000 claims abstract description 14
- 238000001816 cooling Methods 0.000 claims abstract description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 18
- 239000001301 oxygen Substances 0.000 claims description 18
- 229910052760 oxygen Inorganic materials 0.000 claims description 18
- 238000005266 casting Methods 0.000 claims description 11
- 239000004576 sand Substances 0.000 abstract description 10
- 238000002485 combustion reaction Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 3
- 238000007711 solidification Methods 0.000 abstract description 2
- 230000008023 solidification Effects 0.000 abstract description 2
- 238000007664 blowing Methods 0.000 abstract 1
- 239000002994 raw material Substances 0.000 abstract 1
- 238000010304 firing Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野１
本発明は中子除去方法、更に詳しくは鋳型に金型を用い
る鋳造法において、鋳造後に中子を除去する方法に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a method for removing a core, and more particularly to a method for removing a core after casting in a casting method using a metal mold as a mold.
［従来の技術］
有機粘結剤を用いた中子を使用した鋳造法において、鋳
造後に鋳包まれた中子を容易に除去するために空気など
の酸素含有ガスを中子に供給する方法が知られている。[Prior art] In a casting method using a core using an organic binder, there is a method of supplying an oxygen-containing gas such as air to the core in order to easily remove the encased core after casting. Are known.
例えば本出願人は特開昭５８− １４１８４４号公報に
記載された、鋳物中に鋳ぐるまれている有機粘結剤を用
いた中子に、該有機粘結剤の燃焼温度以上に加熱された
酸素を含有する燃焼用ガスを供給せしめる鋳物中の中子
の除去方法を提案した。For example, the applicant of the present application has disclosed in Japanese Unexamined Patent Publication No. 141844/1983 that a core using an organic binder that is enclosed in a casting is heated to a temperature higher than the combustion temperature of the organic binder. We proposed a method for removing cores from castings that supplies combustion gas containing oxygen.
更に本出願人は特開平１ − １３４１６１号において
、鋳造後の型開き前に中子に酸素含有ガスを供給して有
機粘結剤を燃焼させる際に、中子温度が所定の温度範囲
内となるように、前記酸素含有ガスの供給を間欠的に行
なうか、又は前記酸素含有ガスの供給量を増減させる中
子除去方法を提案した。Furthermore, in Japanese Patent Application Laid-open No. 1-134161, the present applicant discloses that when an oxygen-containing gas is supplied to the core to burn an organic binder before opening the mold after casting, the core temperature is within a predetermined temperature range. Thus, a core removal method has been proposed in which the oxygen-containing gas is supplied intermittently or the amount of oxygen-containing gas supplied is increased or decreased.
［発明が解決しようとする課題］
鋳造用の中子は中子本体と巾木部とからなる。然して、
従来中子に酸素含有ガスを供給する際には、中子本体を
鋳型のキャビティ内の所定位置に保持するための固定手
段である巾木部の少なくとも一つから酸素含有ガスを供
給し、他の巾木部から燃焼ガスを排出していた。しかし
ながら、中子の巾木部から酸素含有ガスを供給し続ける
と，中子本体の有機粘結剤のみならず燃焼ガスを排出す
る中子の巾木部の有機粘結剤ち燃焼する。このため、前
記巾木部が崩壊し、巾木部の砂が燃焼ガスの排出口の周
囲に飛散するので鋳型の清掃が必要であった。又、酸素
含有ガスの供給口が一箇所で排出口が複数箇所ある場合
、一箇所の排出口から砂が飛散すると中子内で酸素含有
ガスがショートパスを起し、中子内の有機粘結剤の燃焼
状態に片寄りが生ずる。その上、崩壊した巾木部に対応
する排出口から排出される燃焼ガスには有機粘結剤の未
燃焼分が含まれており、これが前記排出口の周囲の鋳型
壁面に接して約４００℃以下に冷却されるとヤニ状とな
って鋳型壁面に付着し、除去のためには多大の労力及び
時間を必要とする。[Problems to be Solved by the Invention] A core for casting consists of a core body and a baseboard. However,
Conventionally, when supplying oxygen-containing gas to the core, the oxygen-containing gas is supplied from at least one of the baseboard parts, which is a fixing means for holding the core body in a predetermined position in the cavity of the mold; Combustion gas was being discharged from the baseboard. However, if oxygen-containing gas is continued to be supplied from the baseboard of the core, not only the organic binder in the core body but also the organic binder in the baseboard of the core that discharges combustion gas will burn. As a result, the baseboard collapses and the sand in the baseboard scatters around the combustion gas outlet, making it necessary to clean the mold. In addition, if the oxygen-containing gas has one supply port and multiple discharge ports, if sand scatters from one discharge port, the oxygen-containing gas will cause a short pass inside the core, causing organic viscosity inside the core. Unevenness occurs in the combustion state of the binder. Furthermore, the combustion gas discharged from the outlet corresponding to the collapsed baseboard contains unburned organic binder, which is heated to about 400°C in contact with the mold wall surface around the outlet. When it is cooled below, it becomes tar-like and adheres to the mold wall, requiring a great deal of effort and time to remove it.
本発明は上記従来技術における問題点を解決するための
ものであり、その目的とするところは、中子に酸素含有
ガスを供給する際の、中子の巾木部からの砂の飛散、中
子内の酸素含有ガスのショートパス及び鋳型壁面へのヤ
ニの付着を防止することができる中子除去方法を提供す
ることにある。The present invention is intended to solve the above-mentioned problems in the prior art, and its purpose is to reduce the scattering of sand from the baseboard of the core when supplying oxygen-containing gas to the core. It is an object of the present invention to provide a method for removing a core that can prevent a short path of oxygen-containing gas inside the core and prevent tar from adhering to the wall surface of the mold.
〔課題を解決するための手段］
すなわち本発明の中子除去方法は、鋳造後の型開き前に
、本体と巾木部とからなる中子の少なくとも一つの巾木
部から酸素含有ガスを供給し他の巾木部から燃焼ガスを
排出して中子本体の有機粘結剤を燃焼させる際に、燃焼
ガスを排出する中子の巾本部に気流を当てて該巾木部を
冷却することを特徴とする。[Means for Solving the Problems] In other words, the core removal method of the present invention includes supplying an oxygen-containing gas from at least one baseboard portion of the core consisting of a main body and a baseboard portion before opening the mold after casting. When exhausting combustion gas from other baseboard parts to burn the organic binder in the core body, airflow is applied to the baseboard part of the core from which the combustion gas is discharged to cool the baseboard part. It is characterized by
燃焼ガスを排出する中子の巾本部に当てる気流としては
、該巾木部を冷却できるものであればよく、例えば空気
、二酸化炭素、窒素等の気流が挙げられる。これらは単
独又は混合して用いることができる。その流量は適宜選
択する。The airflow applied to the width portion of the core from which combustion gas is discharged may be of any type as long as it can cool the baseboard, and examples thereof include airflow, carbon dioxide, nitrogen, and the like. These can be used alone or in combination. The flow rate is selected appropriately.
又、前記中本部に気流を当てる手段としては、燃焼ガス
の排出口とは別に冷却用気流の供給口を設ける。冷却用
の気流は吸引によって供給してもよいし、又は圧送して
もよい。気流によるψ却条件は予め実験によって決定し
ておくか、又は冷却すべき巾木部又はその近傍の鋳型に
温度センサを設けて手動又は自動により調整してもよい
。なお、酸素含有ガスとしては空気を使用するのが実用
上都合がよいが、有機粘結剤を燃焼させ得る程度に酸素
を含有するものであれば、他の組成のガスでもよい。Further, as a means for applying airflow to the central portion, a cooling airflow supply port is provided separately from the combustion gas exhaust port. The cooling airflow may be provided by suction or may be pumped. The ψ cooling conditions due to the airflow may be determined in advance through experiments, or may be adjusted manually or automatically by providing a temperature sensor on the baseboard to be cooled or on the mold in the vicinity thereof. Although it is practically convenient to use air as the oxygen-containing gas, other gases may be used as long as they contain oxygen to the extent that the organic binder can be combusted.
中子の有機粘結剤を燃焼させる際に、燃焼ガスを排出す
る中子の巾本部に気流を当てて該巾木部を冷却するため
、該巾木部の有機粘結剤の燃焼による崩壊を防止するこ
とができる。When the organic binder in the core is burnt, airflow is applied to the width of the core that releases combustion gas to cool the baseboard, which causes the organic binder in the baseboard to collapse due to combustion. can be prevented.
以下の実施例により本発明を更に詳細に説明する。なお
、本発明は下記実施例に限定されるものではない。The invention will be explained in further detail by the following examples. Note that the present invention is not limited to the following examples.
第１図はシリンダーブロックを製造する際に、本発明の
方法を適用した例を示す。図中、１．２及び３は有機粘
結剤を結合剤としたウォータージャケット中子の各部分
を示し、■は中子本体、２及び３は巾木部である。FIG. 1 shows an example in which the method of the present invention is applied to manufacturing a cylinder block. In the figure, numerals 1, 2 and 3 indicate the respective parts of the water jacket core using an organic binder as a binder, ▪ is the core body, and 2 and 3 are the baseboard parts.
アルミニウム溶湯を金型９のキャビティ内に注入後粗材
４の凝固が完了した時点で、空気をバルブ８を有する供
給管５から圧力５ Ｋｇ／ｃｒｎ”、流量０． １Ｎｎ
ｆ ／分で巾木部２を通して図中矢印の如く中子に吹込
む。この空気は、中子の巾木部２を通り中子本体ｌの有
機粘結剤を燃焼させながら、巾木部３を通って図中矢印
の如く排出口６から金型９外へ排出される。この状態で
空気を吹込み続けると、巾木部３の有機粘結剤も燃焼す
るため巾木部３が崩壊し、砂が排出口６から飛散する。After the aluminum molten metal is injected into the cavity of the mold 9 and solidification of the rough material 4 is completed, air is supplied from the supply pipe 5 having the valve 8 at a pressure of 5 Kg/crn and a flow rate of 0.1 Nn.
Blow into the core through the baseboard 2 at a rate of f/min as shown by the arrow in the figure. This air passes through the baseboard part 2 of the core, burns the organic binder in the core body l, passes through the baseboard part 3, and is discharged from the outlet 6 to the outside of the mold 9 as shown by the arrow in the figure. Ru. If air is continued to be blown in this state, the organic binder in the baseboard 3 will also burn, causing the baseboard 3 to collapse and sand to scatter from the discharge port 6.
これを防ぐため、供給管５から空気を吹込んだ約２秒後
に、排出口６から吸引することにより、大気中の空気を
供給口７から図中矢印の如く吸込み、巾木部３を冷却し
た。これにより巾木部３の崩壊は防止され、排出口６か
らの砂の飛散の問題は解消された。なお、供給口７から
空気を嗅込む代りに、供給口７から例えば圧力５ Ｋｇ
／ｃｒｒ？未満の空気を圧送してもよい。中子木体ｌの
有機粘結剤を完全に燃焼させた後は、巾木部２及び３を
抜取り、又、中子本体は容易に崩壊するので砂出しする
ことにより除去した。In order to prevent this, approximately 2 seconds after air is blown in from the supply pipe 5, air is sucked from the exhaust port 6, and air from the atmosphere is sucked in from the supply port 7 as shown by the arrow in the figure, thereby cooling the baseboard portion 3. did. This prevented the baseboard portion 3 from collapsing and solved the problem of sand scattering from the discharge port 6. Note that instead of sniffing air from the supply port 7, for example, a pressure of 5 kg is supplied from the supply port 7.
/crr? Air may be pumped in less than 2 hours. After the organic binder in the core wood l was completely burnt out, the baseboard parts 2 and 3 were removed, and since the core body easily disintegrated, it was removed by sanding.
［考案の効果］
上述の如く本発明の中子除去方法は、酸素含有ガスを中
子に供給して中子の有機粘結剤を燃焼させる際に、燃焼
ガスを排出する中子の巾木部に気流を当てて該巾木部を
冷却するため、該巾木部の有機粘結剤の燃焼による崩壊
を防止することができる。このため、前記巾木部の砂が
鋳型内に飛散することがなく、鋳造した粗材を鋳型から
取出す時に鋳型内に砂が残留せず、又、鋳型壁面へのヤ
ニの付着もなく、鋳型の清掃の必要がなくなるため中子
の除去が容易であり、作業効率が向上する。更に中子内
の酸素含有ガスのショートパスによる中子の焼成不良ち
ない。それ故、従来の鋳造工程の中で中子砂焼き工程を
兼ねることが可能となり、中子妙の除去を目的とした砂
焼き工程を別途設ける必要が無くなり、工場設備スペー
スの有効活用及び少エネルギーに多大な効果を示す。[Effects of the invention] As described above, the core removal method of the present invention provides a core baseboard that discharges combustion gas when oxygen-containing gas is supplied to the core to burn the organic binder in the core. Since the baseboard is cooled by applying airflow to the baseboard, it is possible to prevent the baseboard from collapsing due to combustion of the organic binder. Therefore, the sand in the baseboard does not scatter into the mold, no sand remains in the mold when the cast rough material is taken out of the mold, and there is no resin attached to the mold wall. Since there is no need to clean the core, it is easy to remove the core, improving work efficiency. Furthermore, a short pass of the oxygen-containing gas inside the core may result in poor firing of the core. Therefore, it is possible to combine the core sand firing process in the conventional casting process, eliminating the need for a separate sand firing process for the purpose of removing core defects, making effective use of factory equipment space and using less energy. shows great effects.
第１図は本発明の中子除去方法の一実施例の説明図であ
る。
図中、
ｌ・・・中子本体 ２．３・・・巾木部 ４・・・粗
材５・・・供給管 ６・・・排出口 ７・・・
供給口８・・・バルブ ９・・・金型FIG. 1 is an explanatory diagram of an embodiment of the core removal method of the present invention. In the figure, l... core body 2.3... baseboard part 4... rough material 5... supply pipe 6... discharge port 7...
Supply port 8... Valve 9... Mold
Claims (1)
なくとも一つの巾木部から酸素含有ガスを供給し他の巾
木部から燃焼ガスを排出して中子本体の有機粘結剤を燃
焼させる際に、燃焼ガスを排出する中子の巾木部に気流
を当てて該巾木部を冷却することを特徴とする中子除去
方法。After casting, before opening the mold, oxygen-containing gas is supplied from at least one baseboard part of the core consisting of a main body and a baseboard part, and combustion gas is discharged from the other baseboard parts to reduce the organic viscosity of the core body. A method for removing cores, which comprises cooling the baseboard part of the core by applying airflow to the baseboard part from which combustion gas is discharged when burning the binder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18699089A JPH0352757A (en) | 1989-07-19 | 1989-07-19 | Method for removing core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18699089A JPH0352757A (en) | 1989-07-19 | 1989-07-19 | Method for removing core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0352757A true JPH0352757A (en) | 1991-03-06 |
Family
ID=16198275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18699089A Pending JPH0352757A (en) | 1989-07-19 | 1989-07-19 | Method for removing core |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0352757A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016112604A (en) * | 2014-12-17 | 2016-06-23 | リョービ株式会社 | Sand core removal method |
-
1989
- 1989-07-19 JP JP18699089A patent/JPH0352757A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016112604A (en) * | 2014-12-17 | 2016-06-23 | リョービ株式会社 | Sand core removal method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| ATE289236T1 (en) | METHOD FOR DIRECT COOLED CASTING | |
| DE60311658D1 (en) | Method for casting a directionally solidified casting body | |
| JPS6316853A (en) | Sand removing method for core sand | |
| JP2854814B2 (en) | Vanishing model casting | |
| JPH05161957A (en) | Casting method and mold | |
| JPH0352757A (en) | Method for removing core | |
| JP2007160323A (en) | Vacuum molding | |
| JP2827827B2 (en) | Degassing equipment in casting mold equipment | |
| JPH03465A (en) | Method for removing core | |
| JPS61296938A (en) | Casting method using sand mold | |
| JPH11207456A (en) | Sand mold and method for holding molten metal pouring mold | |
| JPS63264243A (en) | Mold for casting sublimation pattern | |
| JPH02224866A (en) | Method for removing core | |
| JPH0635047B2 (en) | How to remove the core | |
| JPH04344867A (en) | Method for cleaning and discharging harmful gas produced at the time of casting into lost foam pattern | |
| JPS57193266A (en) | Metallic mold for casting | |
| JPH01205865A (en) | Method for removing core sand in casting | |
| US4266595A (en) | Use of mold venting practices in green sand molding for odor reduction | |
| JP2006212669A (en) | Cooling device for molten metal pouring flask | |
| JPS6015062A (en) | Prevention of casting defect | |
| JPH029531B2 (en) | ||
| JPS63130255A (en) | Method for sand stripping of core for casting | |
| JPS623850A (en) | Molding method for consumable casting mold | |
| JP2004270466A (en) | Cylinder bore machining method | |
| KR100411103B1 (en) | Port core floating prevention device of mold |