JPS6326234A - Production of core for pressure casting - Google Patents
Production of core for pressure castingInfo
- Publication number
- JPS6326234A JPS6326234A JP16741086A JP16741086A JPS6326234A JP S6326234 A JPS6326234 A JP S6326234A JP 16741086 A JP16741086 A JP 16741086A JP 16741086 A JP16741086 A JP 16741086A JP S6326234 A JPS6326234 A JP S6326234A
- Authority
- JP
- Japan
- Prior art keywords
- core
- mold
- layer
- coating material
- coating layer
- 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
- 238000005266 casting Methods 0.000 title claims description 24
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 239000011247 coating layer Substances 0.000 claims abstract description 34
- 239000004576 sand Substances 0.000 claims abstract description 19
- 239000010445 mica Substances 0.000 claims abstract description 13
- 229910052618 mica group Inorganic materials 0.000 claims abstract description 13
- 238000000465 moulding Methods 0.000 claims abstract description 12
- 238000001035 drying Methods 0.000 claims abstract description 11
- 239000002245 particle Substances 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000010439 graphite Substances 0.000 claims abstract description 9
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 9
- 239000002002 slurry Substances 0.000 claims abstract description 8
- 239000011819 refractory material Substances 0.000 claims abstract description 5
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 4
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 4
- 238000001704 evaporation Methods 0.000 claims abstract 2
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000010304 firing Methods 0.000 claims description 4
- 239000010419 fine particle Substances 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 abstract description 27
- 238000000576 coating method Methods 0.000 abstract description 27
- 239000010410 layer Substances 0.000 abstract description 25
- 239000000463 material Substances 0.000 abstract description 24
- 230000013011 mating Effects 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 8
- 239000002344 surface layer Substances 0.000 abstract description 4
- 230000008020 evaporation Effects 0.000 abstract 1
- 238000012856 packing Methods 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 16
- 229910052751 metal Inorganic materials 0.000 description 13
- 239000002184 metal Substances 0.000 description 13
- 230000000694 effects Effects 0.000 description 4
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000004512 die casting Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- 206010011878 Deafness Diseases 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000008119 colloidal silica Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000019441 ethanol Nutrition 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000011268 mixed slurry Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
Landscapes
- Mold Materials And Core Materials (AREA)
- 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）
本発明は、ダイカスト法等の圧力鋳造用とじて用いる中
子の製造法の改良に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a method for manufacturing a core used for pressure casting such as die casting.
（従来の技術）
一般に、ダイカスト法等の圧力鋳造法により中空部を有
する鍋物を鋳造する場合、湯圧によりシェル中子内に溶
湯が差し込むことから、鋳造後の鋳物の中空部内壁には
シェル中子を構成する中子砂の一部が噛み込むおそれが
市る。そして、この中子砂の一部が噛み込んだ状態の鋳
物を製品として使用すると、使用中に上記中子砂が中空
部内壁より離脱して中空部内を流れるオイルや水等の液
体に混入覆ることが考えられることから、このような串
態が発生しないよう、例えば特告昭６０−１５４１８号
公報に開示されているように、シェル中子の表面に粉末
状の耐火物とコロイダルシリカとを混合したスラリー液
を塗布乾燥して第１コーティング層を形成し、その後、
該第１コーティング層上に雲母水溶液を塗布して第２コ
ーティング層を形成することにより、上記第１コーティ
ング層でもってシェル中子の表面を平滑にして中子表面
に作用する揚圧の均一化を図るとともに、上２第２コー
ティング層でもって上記シェル中子内への溶湯の浸入を
抑制するようになされたものが知られている。(Prior art) Generally, when casting pots with a hollow part by a pressure casting method such as a die casting method, the molten metal is inserted into the shell core by the hot water pressure, so the inner wall of the hollow part of the casting after casting has a shell. There is a risk that some of the core sand that makes up the core will get stuck. If a casting with part of this core sand entrapped is used as a product, the core sand will separate from the inner wall of the hollow part during use and mix with liquids such as oil and water flowing inside the hollow part. Therefore, in order to prevent such a skewed state from occurring, powdered refractories and colloidal silica are applied to the surface of the shell core, as disclosed in Japanese Patent Publication No. 60-15418, for example. The mixed slurry liquid is applied and dried to form a first coating layer, and then,
By applying a mica aqueous solution on the first coating layer to form a second coating layer, the first coating layer smoothes the surface of the shell core and equalizes the lifting pressure acting on the core surface. It is known that the upper second coating layer is used to suppress the intrusion of molten metal into the shell core.
（発明が解決しようとする問題点）
ところが、上記の従来のものでは、シェル中子の表面に
順次スラリー液および雲母水溶液を塗布する方式である
ため、シェル中子の表面に塗布されたスラリー液および
雲母水溶液は乾燥する間に垂れて、形成される第１およ
び第２コーティング層の留厚が不均一となってシェル中
子の最外表面が平滑でなくなる結果、シェル中子を組み
合わせて使用する場合に、両シェル中子の合わせ面部に
間隙が生じてこの間隙から溶湯が差し込んでしまうとい
う不具合がある。(Problem to be Solved by the Invention) However, in the conventional method described above, the slurry liquid and the mica aqueous solution are sequentially applied to the surface of the shell core, so the slurry liquid applied to the surface of the shell core is Also, the mica aqueous solution drips during drying, making the retained thickness of the first and second coating layers uneven and the outermost surface of the shell core becoming uneven, resulting in the use of a combination of shell cores. In this case, there is a problem in that a gap is created between the mating surfaces of both shell cores, and the molten metal may enter through this gap.
本発明はかかる点に鑑みてなされたものであり、その目
的とするところは、上述の如くシェル中子等中子の最外
表面に形成されるコーティング層を平滑に仕上げる適切
な手段を講することにより、中子を組み合わせて使用す
る場合に、両中子の合わせ面部に間隙が生ずることがな
く、これにより上記中子合わせ面部からの溶湯の差込み
を確実に抑制し得るようにするとともに、鋳肌の良好な
鋳物を鋳造し得るようにプることにある。The present invention has been made in view of the above, and its purpose is to provide an appropriate means for smoothing the coating layer formed on the outermost surface of a core such as a shell core, as described above. By this, when the cores are used in combination, no gap is created between the mating surfaces of both cores, thereby reliably suppressing the insertion of molten metal from the mating surfaces of the cores, and The purpose is to produce castings with good casting surfaces.
（問題点を解決するための手段）
上記の目的を達成するため、本発明の解決手段は、まず
、黒鉛、雲母等の微粒子もしくは偏平粒子を含有する溶
液を中子成形型の成形面に塗イ［シたのち９２燥工程を
経ることにより上記溶液中の揮発性分を蒸散せしめて第
１コーティング層を形成する。次に、粉末状の耐火物、
金属酸化物等を含有するスラリー液を上記第１コーティ
ング層上に塗布したのち上記成形型内に中子砂を充填す
る。(Means for Solving the Problem) In order to achieve the above object, the solution of the present invention is to first apply a solution containing fine particles or flat particles of graphite, mica, etc. to the molding surface of the core mold. After that, volatile components in the solution are evaporated through a 92-drying step to form a first coating layer. Next, powdered refractories,
After applying a slurry liquid containing metal oxides and the like onto the first coating layer, the mold is filled with core sand.
その後、加熱工程を経ることにより上記中子砂を焼成せ
しめて中子本体を成形するとともに、上記スラリー液中
の揮発性分を蒸散せしめて第２コーティング層を形成す
る。しかる後、上記焼成により成形された中子を成形型
より取り出す方法にする。Thereafter, a heating step is performed to sinter the core sand to form a core body, and to evaporate volatile components in the slurry liquid to form a second coating layer. Thereafter, the core formed by the above firing is taken out from the mold.
（作用）
上記の構成により、本発明では、中子の最外表面層を構
成する第１コーティング層は中子成形型の成形面に塗布
形成されることから、第１コーティング層の塗布形成過
程で液垂れが生じても、この液垂れは中子の最外表面で
はなくその後に塗布形成される第２コーティング層側に
生じ、これにより最終的に成形された中子の最外表面は
成形面の形状にならって所期の目的とする平滑状態に仕
上げられることとなる。よって中子を組み合わせて使用
する場合、両中子の合わせ面部に間隙が生ずることがな
く、上記中子合わせ面部からの溶湯の差込みが確実に抑
制されるとともに、鋳肌の良好な鋳物が鋳造されること
となる。(Function) With the above configuration, in the present invention, the first coating layer constituting the outermost surface layer of the core is formed by coating on the molding surface of the core mold, so the process of coating and forming the first coating layer Even if dripping occurs, this dripping will occur not on the outermost surface of the core, but on the side of the second coating layer that is applied and formed afterwards, and as a result, the outermost surface of the final molded core will be It follows the shape of the surface and is finished to the desired smooth state. Therefore, when using a combination of cores, there is no gap between the mating surfaces of both cores, and the insertion of molten metal from the mating surfaces of the cores is reliably suppressed, and castings with good casting surfaces are cast. It will be done.
（実施例） 以下、本発明の実施例を図面に基づい−（説明する。(Example) Hereinafter, embodiments of the present invention will be described based on the drawings.
第１面は本発明の実施例に係る圧力鋳造用中子製造法の
製造工程を示し、まず、第１図（ａ＞に示すような中子
成形型１を用意する。そして、第１図（ｂ）および（Ｃ
）に示ずように、黒鉛、雲母等の微粒子もしくは偏平粒
子を含有する溶液２（以下、第１塗型材という）を上記
中子成形型１内に注入したのち排出する操作を適数回繰
り返してその成形面に所定厚さの第１塗型材層３を塗％
形成する。この場合、上記第１塗型材２が黒丘イ１粒子
の塗型材で必るとぎは、例えば平均粒径０．５〜１０μ
ｒｎの黒鉛粒子５Ｑ重量部に対し水５ｏ臣伊部の割合で
配合したものを、また、雲母粒子の塗型材であるときに
は、例えば平均粒径２〜１０μγ范の雲母粒子８０重量
部に対し水ガラス（珪酸ナトリウム）２０重１部の割合
で配合したものをそれぞれ用いる。このように黒鉛およ
び雲母粒子の粒径を上記の範囲に８シ定した王！１ノ由
は、下限は製造上の問題であり、上限はその後乾燥工程
を経ることにより形成される第１コーティング層３′の
緻密化が困難となってｖｉ造時に溶湯浸入のおそれがあ
るからである。The first page shows the manufacturing process of the pressure casting core manufacturing method according to the embodiment of the present invention. First, a core mold 1 as shown in FIG. 1 (a>) is prepared. (b) and (C
), the operation of injecting a solution 2 containing fine particles or flat particles of graphite, mica, etc. (hereinafter referred to as the first coating material) into the core mold 1 and then discharging it is repeated an appropriate number of times. Then, apply a first coating material layer 3 of a predetermined thickness to the molding surface.
Form. In this case, the first mold coating material 2 must be a mold coating material of 1 particle of Kurokai, for example, with an average particle diameter of 0.5 to 10 μm.
For example, in the case of mica particle coating material, water glass is mixed with 80 parts by weight of mica particles having an average particle size of 2 to 10μγ. (Sodium silicate) A mixture of 20 parts by weight and 1 part is used, respectively. In this way, the particle sizes of graphite and mica particles were determined to be within the above range! The first reason is that the lower limit is a manufacturing problem, and the upper limit is because it becomes difficult to densify the first coating layer 3' formed by the subsequent drying process, and there is a risk of molten metal intrusion during VI manufacturing. It is.
次に、上記第１塗型材府３を塗布形成した成形型１を乾
燥工程に搬入し、例えば乾燥温度１００°Ｃ１乾燥時間
３０分の条件下で上記第１塗型材層３を乾燥せしめるこ
とにより、第１図（ｄ）に示すように、上記第１塗型材
層３の揮発性分を蒸散せしめて第１コーテイシグ層３′
を形成する。このように乾燥させることにより、後から
塗布する第２塗型材の塗布による影響すなわち第２塗型
材が第１塗型材層へ混入して第１塗型材層の厚みが不均
一になることが防止できる。この第１コーティング層３
′の層厚としては、黒鉛層の場合には例えば１０〜５０
μＴｒＬに、雲母層の場合には例えば５０〜１５０μγ
Ｆにそれぞれ形成する。このように黒鉛および雲母の層
厚゛を上記の範囲に設定した理由は、黒鉛層の場合には
１０μｍ未満では鋳造時に湯圧によりクラックが生ずる
おそれがある一方、５０μ７ｒＬを越えるとその後に成
形される中子本体６−に対する溶湯の層厚の増加に比例
した浸入防止効果が期待できないからであり、また、雲
母層の場合には上記黒鉛層と同様に５０μ７ｒＬ未満で
は鋳造時に湯圧によりクラックが生ずるおそれがある一
方、１５０μ７ｎを越えるとその後に成形される中子本
体６′に対する溶湯の層厚の増加に比例した浸入防止効
果が期待できないからである。Next, the mold 1 coated with the first coating material layer 3 is carried into a drying process, and the first coating material layer 3 is dried under conditions of, for example, a drying temperature of 100° C. and a drying time of 30 minutes. , as shown in FIG. 1(d), the volatile components of the first coating material layer 3 are evaporated and the first coating material layer 3' is formed.
form. By drying in this way, the influence of the second coating material applied later, that is, the second coating material is mixed into the first coating material layer and the thickness of the first coating material layer is prevented from becoming uneven. can. This first coating layer 3
In the case of a graphite layer, the layer thickness of ' is, for example, 10 to 50
μTrL, for example, 50 to 150 μγ in the case of a mica layer
Form each F. The reason for setting the layer thickness of graphite and mica within the above range is that if the thickness of the graphite layer is less than 10 μm, cracks may occur during casting, while if it exceeds 50 μ7 rL, it will not be possible to form the layer afterward. This is because the prevention effect proportional to the increase in the layer thickness of the molten metal into the core body 6- cannot be expected, and in the case of a mica layer, as with the graphite layer, if it is less than 50 μ7 rL, cracks will occur due to the hot water pressure during casting. On the other hand, if the thickness exceeds 150μ7n, it is impossible to expect the effect of preventing the molten metal from penetrating into the core body 6' which is formed thereafter in proportion to the increase in the layer thickness.
その後、粉末状の耐火物、金属酸化物等を含有するスラ
リー液４（以下、第２塗型材という）を、上記第１図（
ｂ）および（Ｃ）の聾饋にて、上記第１コーティング層
３′を形成した中子成形型１内に注入したのち排出する
操作を適数回繰り返して、第１図（ｅ）に示すように、
第１コーティング層３′上に所定厚さの第２塗型材層５
を塗布形成する。なお、上記第２塗型材４の配合組成と
しテハ、例えハＳ ｉ ０２ ５５．５ｕｆａ部、Ａｌ
Ｏ３２、Ｏ！ｆｆ１部、Ｆｅｚ ０３ ４．０ｌｆｔ部
、ＣａＯｏ、５Ｒｆｆ１部、Ｍｇｏ ２５．Ｏｆｆｉ
ｍ部、ＺｒＯ２０，５ｆｆｌｆｆ１部、Ｃ６，Ｏ＠ｆｆ
ｉ部、その伯 ４．５ｆｆｉｆｆ１部を、エチルアルコ
ールにて５０％に希釈したものを用いる。Thereafter, the slurry liquid 4 (hereinafter referred to as the second coating material) containing powdered refractories, metal oxides, etc. is applied to the above-mentioned Figure 1 (
In the deaf state of b) and (c), the operation of injecting into the core mold 1 on which the first coating layer 3' was formed and then discharging it was repeated an appropriate number of times, and the result was as shown in FIG. 1(e). like,
A second coating material layer 5 of a predetermined thickness is formed on the first coating layer 3'.
Form by applying. It should be noted that the composition of the second coating material 4 is as follows: for example, Si 02 55.5 ufa parts, Al
O32, O! ff1 part, Fez 03 4.0lft part, CaOo, 5Rff1 part, Mgo 25. Offi
m part, ZrO20, 5fflff 1 part, C6, O@ff
Use 1 part of 4.5ffiff diluted to 50% with ethyl alcohol.
次いで、第１図（ｆ）に示すように、上記成形型１内に
中子砂６を充填したのち加熱温度２５０°Ｃ１加熱時間
２０分の条件下の加熱工程を経ることにより、第′１図
（Ｃ＋）に示すように、上記中子砂６を焼成せしめて中
子本体６′を成形するとともに、上記第２塗型材層５中
の揮発性分つまりエチルアルコールを蒸散せしめて例え
ば１００〜３５０μｍの層厚の第２コーテイング層５−
を形成し、中子７を成形する。この中子７成形に用いる
中子砂６としては例えば２００メツシユの砂にバインダ
としてフェノール樹脂を配合したレジンコーテツドザン
ドを用いる。また、上記第２コーティング！ｖ：Ｉ５−
の層厚を上記の範囲に設定した理由は、１００μ瓦未満
では鋳造時に湯圧によりクラックが生ずるおそれがある
一方、３５０μ汎を越えると中子本体６′に対する溶湯
の層厚の増加に比例した浸入防止効果が期（、ｈできず
、かえってシェル中子７の寸法精度に恕影響を及ぼすお
それがあるからで必る。Next, as shown in FIG. 1(f), after filling the mold 1 with core sand 6, a heating process is performed at a heating temperature of 250° C. and a heating time of 20 minutes. As shown in FIG. second coating layer 5- with a layer thickness of 350 μm;
, and mold the core 7. As the core sand 6 used for molding the core 7, for example, a resin coated sand prepared by blending 200 mesh sand with a phenol resin as a binder is used. Also, the second coating above! v:I5-
The reason for setting the layer thickness in the above range is that if it is less than 100μ, cracks may occur due to the pressure of the molten metal during casting, while if it exceeds 350μ, it is proportional to the increase in the layer thickness of the molten metal relative to the core body 6'. This is necessary because there is a risk that the infiltration prevention effect may not be effective, and the dimensional accuracy of the shell core 7 may be adversely affected.
しかる後、上記成形型１を型開きして上記焼成により成
形されたシェル中子７を成形型１より取り出す。Thereafter, the mold 1 is opened and the shell core 7 formed by the firing is taken out from the mold 1.
このようにして成形されたシェル中子７は、その最外表
面層で必る第１コーティング層３′形成時に該第１コー
ティング層３′が成形型１の成形面に接触していること
から、第′１塗型材２の乾燥過程で生ずる波乗れは上記
成形面側に生ずることがなく、よって上記第１コーティ
ング層３′の外表面つまりシェル中子７の最外表面を上
記成形面の形状にならって所期の目的とする平滑状態に
仕上げることができる。The shell core 7 formed in this manner has the first coating layer 3' in contact with the molding surface of the mold 1 when the first coating layer 3' is formed on its outermost surface layer. The undulations that occur during the drying process of the 'first coating material 2' do not occur on the molding surface side, so that the outer surface of the first coating layer 3', that is, the outermost surface of the shell core 7, is It can be finished to the desired smooth state by following the shape.
したがって、第２図に示すような自動車のロータリーエ
ンジンのローター８を鋳造する場合、該ローター８鋳造
用として第３図に示すように、上下に２分割された分割
タイプの中子７ａ、７ｂを上述の如くして成形し、該両
中子７ａ、７ｂを組み合わせて、第４図に示すように、
上型９および下型１０よりなる鋳型１１内に配置し、プ
ランジャ１２の作動により溶湯Ａを鋳型１１内に注入す
ることにより行う。この場合、上記両中子７ａ。Therefore, when casting a rotor 8 for an automobile rotary engine as shown in FIG. 2, a split-type core 7a, 7b, which is divided into two upper and lower parts, is used for casting the rotor 8, as shown in FIG. After molding as described above and combining both cores 7a and 7b, as shown in FIG.
This is carried out by placing the molten metal A in a mold 11 consisting of an upper mold 9 and a lower mold 10, and injecting the molten metal A into the mold 11 by operating a plunger 12. In this case, both cores 7a.
７ｂは正規の状態に組み合わけられてその合わせ面部に
間隙が生ずることがなく、よって上記中子７ａ、７ｂ合
わせ面部からの溶汎ｊの差込みを確実に抑制することが
できるとともに、鋳肌の良好な鋳物をＶｉ造することが
できる。The cores 7b are assembled in a normal state so that no gap is created between the mating surfaces of the cores 7a and 7b, thereby reliably suppressing the insertion of the weld pan j from the mating surfaces of the cores 7a and 7b, and also preventing the casting surface from forming. Good quality castings can be made using Vi.
なお、上記実施例では、中子本体６′をレジンコーテツ
ドサンドで構成した場合について示したが、これに限ら
ず、例えばセメント砂等の自硬堆砂で構成することも採
用可能であり、この場合においては、成形型としてプラ
スチック製のものを用いてマイクロ波加熱により上記自
硬堆砂を硬化せしめて中子本体を成形する。In the above embodiment, the case where the core body 6' is made of resin-coated sand is shown, but the core body 6' is not limited to this, and it is also possible to make it made of self-hardened sand such as cement sand. In this case, a plastic mold is used to harden the self-hardened sand by microwave heating to mold the core body.
（発明の効果）
以上説明したように、本発明方法によれば、まず、中子
の最外表面層を構成する第１コーティング層を成形型の
成形面に形成した後、該第１コーティング層上に第２コ
ーティング層を形成し、しかる後、上記成形型内に中子
砂を充１眞するようにしたので、上記第１および第２コ
ーティング層を形成する過程で液垂れが生じても、この
液垂れは上記成形型側ではなく第２コーティング層側に
生じて最終的に成形された中子の最外表面は所期の目的
とする平滑状態に仕上げられることとなり、よって中子
を組み合わせて使用する場合に、両中子の合わせ面部に
間隙が生ずることがなく、これにより上記中子合ねｔｕ
ｆｆｉｊ部からの溶湯の差込みを確実に抑制することが
できるとともに、鋳肌の良好な鋳物を鋳造することがで
きる。(Effects of the Invention) As explained above, according to the method of the present invention, first, the first coating layer constituting the outermost surface layer of the core is formed on the molding surface of the mold, and then the first coating layer is formed on the molding surface of the mold. The second coating layer is formed on top, and then the mold is filled with core sand, so even if dripping occurs during the process of forming the first and second coating layers, there is no problem. This dripping occurs not on the mold side but on the second coating layer side, and the outermost surface of the final molded core is finished in the desired smooth state. When used in combination, there is no gap between the mating surfaces of both cores, which allows the cores to be joined together.
Insertion of molten metal from the ffij part can be reliably suppressed, and a casting with a good casting surface can be cast.
第１図は本発明の実施例に係る圧力ｖｆＮ用中子製造法
を示す製造工程図、第２図は自動車のロータリーエンジ
ンのローターを鋳型より取り出した状態を示づ斜視図、
＠３図はローター鋳造用の分割タイプの中子を示す分解
斜視図、第４図はローターの鋳造状態を示す縦断正面図
である。
１・・・成形型、２・・・第１塗型材、３・・・第１塗
型材層、３−・・・第１コーティング層、４・・・第２
塗型材、５・・・第２塗型材層、５−・・・第２コーテ
ィング層、６・・・中子砂、６′・・・中子本体、７・
・・シェル中子。
第４図
第３図
第２図FIG. 1 is a manufacturing process diagram showing a method for manufacturing a pressure vfN core according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a rotor of an automobile rotary engine taken out from a mold.
Figure 3 is an exploded perspective view showing a split type core for rotor casting, and Figure 4 is a longitudinal sectional front view showing the state of rotor casting. DESCRIPTION OF SYMBOLS 1... Molding mold, 2... 1st coating material, 3... 1st coating material layer, 3-... 1st coating layer, 4... 2nd
Coating material, 5... Second coating material layer, 5-... Second coating layer, 6... Core sand, 6'... Core body, 7.
...Shell core. Figure 4 Figure 3 Figure 2
Claims (1)
る溶液を中子成形型の成形面に塗布したのち乾燥工程を
経ることにより上記溶液中の揮発性分を蒸散せしめて第
１コーティング層を形成し、次に、該第１コーティング
層上に粉末状の耐火物、金属酸化物等を含有するスラリ
ー液を塗布したのち上記成形型内に中子砂を充填し、そ
の後、加熱工程を経ることにより上記中子砂を焼成せし
めて中子本体を成形するとともに、上記スラリー液中の
揮発性分を蒸散せしめて第２コーティング層を形成し、
しかる後、上記焼成により成形された中子を成形型より
取り出すことを特徴とする圧力鋳造用中子の製造法。(1) A solution containing fine particles or flat particles of graphite, mica, etc. is applied to the molding surface of the core mold, and then a drying process is performed to evaporate volatile components in the solution to form the first coating layer. Next, after applying a slurry liquid containing powdered refractories, metal oxides, etc. on the first coating layer, core sand is filled into the mold, and then a heating process is performed. By firing the core sand to form a core body, and evaporating volatile components in the slurry liquid to form a second coating layer,
A method for producing a pressure casting core, characterized in that the core formed by the firing is then taken out from the mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16741086A JPH0685975B2 (en) | 1986-07-16 | 1986-07-16 | Manufacturing method of core for pressure casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16741086A JPH0685975B2 (en) | 1986-07-16 | 1986-07-16 | Manufacturing method of core for pressure casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6326234A true JPS6326234A (en) | 1988-02-03 |
| JPH0685975B2 JPH0685975B2 (en) | 1994-11-02 |
Family
ID=15849177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16741086A Expired - Fee Related JPH0685975B2 (en) | 1986-07-16 | 1986-07-16 | Manufacturing method of core for pressure casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0685975B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01258841A (en) * | 1988-04-05 | 1989-10-16 | Honda Motor Co Ltd | Manufacture of water soluble mold |
| JPH06254657A (en) * | 1993-03-04 | 1994-09-13 | Hanano Shoji Kk | Treatment of forming surface in mold for shell molding |
| CN107803458A (en) * | 2017-11-16 | 2018-03-16 | 嘉善鑫海精密铸件有限公司 | A kind of application of new material carburant in investment casting casing |
-
1986
- 1986-07-16 JP JP16741086A patent/JPH0685975B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01258841A (en) * | 1988-04-05 | 1989-10-16 | Honda Motor Co Ltd | Manufacture of water soluble mold |
| JPH06254657A (en) * | 1993-03-04 | 1994-09-13 | Hanano Shoji Kk | Treatment of forming surface in mold for shell molding |
| CN107803458A (en) * | 2017-11-16 | 2018-03-16 | 嘉善鑫海精密铸件有限公司 | A kind of application of new material carburant in investment casting casing |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0685975B2 (en) | 1994-11-02 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |