JPS63264246A - Production of core for casting - Google Patents
Production of core for castingInfo
- Publication number
- JPS63264246A JPS63264246A JP9820987A JP9820987A JPS63264246A JP S63264246 A JPS63264246 A JP S63264246A JP 9820987 A JP9820987 A JP 9820987A JP 9820987 A JP9820987 A JP 9820987A JP S63264246 A JPS63264246 A JP S63264246A
- Authority
- JP
- Japan
- Prior art keywords
- casting
- core
- sodium silicate
- casting core
- surface 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 abstract description 35
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 239000004576 sand Substances 0.000 claims abstract description 11
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 9
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 10
- 239000011230 binding agent Substances 0.000 claims description 9
- 238000010304 firing Methods 0.000 claims description 4
- 239000003110 molding sand Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims 1
- 230000007547 defect Effects 0.000 abstract description 10
- 239000002344 surface layer Substances 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 239000007787 solid Substances 0.000 abstract description 2
- 238000001354 calcination Methods 0.000 abstract 1
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 238000007598 dipping method Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 239000005011 phenolic resin Substances 0.000 description 2
- 239000008187 granular material Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000010112 shell-mould casting Methods 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 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〕
この発明は、鋳物砂を粘結剤により成形した鋳造用中子
の製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for producing a casting core made by molding foundry sand with a binder.
従来、この種の鋳造用中子の製造方法としてシェルモー
ルド法が知られている。このシェルモールド法は、成形
性が良く、寸法精度が高いため広く使用されている（以
下、「第一従来技術」と記す）。Conventionally, a shell mold method has been known as a method for manufacturing this type of casting core. This shell molding method is widely used because it has good moldability and high dimensional accuracy (hereinafter referred to as "first conventional technology").
その他、セラミック中子やＣｏｔ中子を製造する方法も
広（使用されている（以下、「第二従来技術」と記す）
。In addition, methods for manufacturing ceramic cores and Cot cores are widely used (hereinafter referred to as "second conventional technology").
.
しかしながら、前記第一従来技術に係る鋳造用中子の製
造方法にあっては、有機系の粘結剤（例えばフェノール
レジン等）を使用しているため、注湯時に熱によってそ
の粘結剤が分解され、ガスが発生し、その発生したガス
が溶湯中に巻き込まれ、ガス欠陥例えば、湯境等の鋳造
欠陥となり、その鋳造製品が圧力・容器であれば圧漏れ
の原因となっていた。However, in the method for manufacturing casting cores according to the first prior art, since an organic binder (for example, phenol resin, etc.) is used, the binder is destroyed by heat during pouring. When decomposed, gas is generated, and the generated gas is engulfed in the molten metal, causing gas defects, such as casting defects such as hot water boundaries, and causing pressure leaks if the cast product is a pressure container.
又、第二従来技術に係る鋳造用中子の製造方法にあって
は、ガス欠陥が少ない代わりに形状の複雑なものの成形
が困難であると共に注湯後の砂の崩壊性が悪い等の欠点
があった。In addition, although the method for manufacturing casting cores according to the second prior art has few gas defects, it has drawbacks such as difficulty in forming objects with complex shapes and poor disintegration of sand after pouring. was there.
この発明は前記不都合を解消するためになされたもので
あり、
その構成は、
鋳物砂を粘結剤により成形した鋳造用中子の製造方法に
おいて、その鋳物砂を有機系粘結剤により成形した鋳造
用中子の表面に珪酸ソーダを塗布しｈ後、その鋳造用中
子を焼成したことを特徴とする鋳造用中子の製造方法で
ある。This invention was made in order to solve the above-mentioned inconvenience, and its structure is as follows: In a method for manufacturing a foundry core in which foundry sand is molded with a binder, the foundry sand is molded with an organic binder. This is a method for manufacturing a casting core, characterized in that the surface of the casting core is coated with sodium silicate, and then the casting core is fired.
この発明の鋳造用中子の製造方法の作用は、鋳物砂を有
機系粘結剤により成形した鋳造用中子であっても、その
鋳造用中子の表面に珪酸ソーダを塗布した後、その鋳造
用中子を焼成することにより、成形性も良く、しかも寸
法精度が高く、ガス欠陥例えば、湯境等の鋳造欠陥のな
い鋳造用中子が得られるものである。The method of manufacturing a casting core of the present invention works by applying sodium silicate to the surface of the casting core, even if the casting core is made by molding foundry sand with an organic binder. By firing the casting core, it is possible to obtain a casting core that has good moldability, high dimensional accuracy, and no casting defects such as gas defects such as hot water spots.
この発明の詳細な説明する。 This invention will be explained in detail.
まず、表面にフェノールレジンがコーティングされたジ
ルコンサンドの砂粒を、２００〜３００℃に加熱された
金型内に、空気と一緒に圧入し、約３０秒間保持した後
、その金型を開き、押し出しピンを利用して、鋳造用中
子を取り出す。First, zircon sand grains whose surface is coated with phenol resin are press-fitted with air into a mold heated to 200-300°C, held for about 30 seconds, then the mold is opened and extruded. Use the pin to take out the casting core.
その後、その鋳造用中子を、８０℃に加熱された１０〜
５０％の珪酸ソーダ水溶液中に、１０〜２０分間浸漬保
持した後取り出し、８００〜１０００℃で２時間焼成す
ると、第１図に示すように、固形状に形成された表面層
１と、その表面層１の 、内部２は鋳物砂３が粒状に形
成された鋳造用中子４が成形されるものである。Thereafter, the casting core was heated to 80°C.
After being immersed in a 50% sodium silicate aqueous solution for 10 to 20 minutes and then taken out and baked at 800 to 1000°C for 2 hours, a solid surface layer 1 and its surface are formed as shown in Fig. 1. In the interior 2 of the layer 1, a casting core 4 in which molding sand 3 is formed into granules is molded.
この場合、その表面Ｎ１の厚さは、例えば、珪酸ソーダ
水溶液の濃度もしくは温度またはその水溶液への浸漬時
間等を変えることによって、変化させることができるも
のである。In this case, the thickness of the surface N1 can be changed by, for example, changing the concentration or temperature of the sodium silicate aqueous solution or the immersion time in the aqueous solution.
このようにして成形したこの発明の鋳造用中子を、従来
のシェル中子やセラミック中子と機能を比較した結果、
第１表の通りであった。なお、表中において、■印は極
めて良い、○印は良い、Δ印はやや悪い、×印は極めて
悪いを意味するものである。As a result of comparing the functions of the casting core of this invention molded in this way with conventional shell cores and ceramic cores,
It was as shown in Table 1. In addition, in the table, the ■ mark means extremely good, the ○ mark means good, the Δ mark means somewhat bad, and the × mark means extremely bad.
第１表
〔発明の効果〕
このように、この発明の鋳造用中子の製造方法は、鋳物
砂を有機系粘結剤により成形した鋳造用中子であっても
、その鋳造用中子の表面に珪酸ソーダを塗布した後、そ
の鋳造用中子を焼成したことにより、成形性も良く、し
かも寸法精度が高く、ガス欠陥例えば、湯境等の鋳造欠
陥のない鋳造用中子を得ることができるものである。Table 1 [Effects of the Invention] As described above, the method for producing a foundry core of the present invention can be applied to a foundry core made by molding foundry sand with an organic binder. By applying sodium silicate to the surface and firing the casting core, a casting core with good moldability, high dimensional accuracy, and no casting defects such as gas defects such as hot water spots can be obtained. It is something that can be done.
第１図は、この発明の鋳造用中子の一部断面斜視図であ
る。
ｌ ・・・ 表面層
２ ・・・ 内部
３ ・・・ 鋳物砂
４ ・・・ 鋳造用中子FIG. 1 is a partially sectional perspective view of a casting core of the present invention. l ... Surface layer 2 ... Inside 3 ... Foundry sand 4 ... Casting core
Claims (3)
造方法において、その鋳物砂を有機系粘結剤により成形
した鋳造用中子の表面に珪酸ソーダを塗布した後、その
鋳造用中子を焼成したことを特徴とする鋳造用中子の製
造方法。(1) In a method for manufacturing a foundry core made of molding sand molded with a binder, sodium silicate is applied to the surface of the foundry core made of foundry sand molded with an organic binder, and then the casting A method for producing a casting core, the method comprising firing a casting core.
布したことを特徴とする特許請求の範囲第１項記載の鋳
造用中子の製造方法。(2) The method for producing a casting core according to claim 1, characterized in that the sodium silicate is applied by heating it to 50 to 100°C.
を特徴とする特許請求の範囲第１項又は第２項記載の鋳
造用中子の製造方法。(3) A method for producing a casting core according to claim 1 or 2, characterized in that the firing temperature is 800 to 1000°C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9820987A JPH0647144B2 (en) | 1987-04-20 | 1987-04-20 | Casting core manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9820987A JPH0647144B2 (en) | 1987-04-20 | 1987-04-20 | Casting core manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63264246A true JPS63264246A (en) | 1988-11-01 |
| JPH0647144B2 JPH0647144B2 (en) | 1994-06-22 |
Family
ID=14213593
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9820987A Expired - Lifetime JPH0647144B2 (en) | 1987-04-20 | 1987-04-20 | Casting core manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0647144B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02104143U (en) * | 1989-02-02 | 1990-08-20 | ||
| CN103611877A (en) * | 2013-11-20 | 2014-03-05 | 江苏江旭铸造集团有限公司 | Coating for casting sand mold |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6315941B1 (en) | 1999-06-24 | 2001-11-13 | Howmet Research Corporation | Ceramic core and method of making |
-
1987
- 1987-04-20 JP JP9820987A patent/JPH0647144B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02104143U (en) * | 1989-02-02 | 1990-08-20 | ||
| CN103611877A (en) * | 2013-11-20 | 2014-03-05 | 江苏江旭铸造集团有限公司 | Coating for casting sand mold |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0647144B2 (en) | 1994-06-22 |
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