JPH01228640A - Supply for precision casting mold - Google Patents
Supply for precision casting moldInfo
- Publication number
- JPH01228640A JPH01228640A JP5429388A JP5429388A JPH01228640A JP H01228640 A JPH01228640 A JP H01228640A JP 5429388 A JP5429388 A JP 5429388A JP 5429388 A JP5429388 A JP 5429388A JP H01228640 A JPH01228640 A JP H01228640A
- Authority
- JP
- Japan
- Prior art keywords
- slurry
- ethyl silicate
- precision casting
- mold
- refractory powder
- 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
- 238000005495 investment casting Methods 0.000 title claims description 13
- 239000002002 slurry Substances 0.000 claims abstract description 36
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 12
- 239000003638 chemical reducing agent Substances 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 abstract description 9
- 230000007062 hydrolysis Effects 0.000 abstract description 5
- 238000006460 hydrolysis reaction Methods 0.000 abstract description 5
- 150000002334 glycols Chemical class 0.000 abstract description 2
- 230000003405 preventing effect Effects 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 abstract 2
- 230000015271 coagulation Effects 0.000 abstract 1
- 238000005345 coagulation Methods 0.000 abstract 1
- 238000000465 moulding Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 235000013312 flour Nutrition 0.000 description 5
- 229910052845 zircon Inorganic materials 0.000 description 5
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 5
- 238000005266 casting Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000008119 colloidal silica Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000005350 fused silica glass Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Landscapes
- Mold Materials And Core Materials (AREA)
Abstract
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は精密鋳造鋳型用スラリーに関する。[Detailed description of the invention] (Industrial application field) The present invention relates to a slurry for precision casting molds.
（従来の技術）
精密鋳造法は、従来の鋳造法に比べて寸法精度が極めて
良い鋳物を得ることができるため、機械加工が不可能な
ものや、機械加工ではコスト高になるものの製造に採用
されており、近年急速に進歩普及してきた。精密鋳造法
は、周知のように、消失模型の表面に耐火物粉末とバイ
ンダーからなる精密鋳造鋳型スラリー（以下、スラリー
という）をコーティングし、耐火スタッコ砂によりサン
ディングし、乾燥するという３工程を数回繰り返すこと
により、所要の厚さをもたせたセラミックシェル層を形
成し、その後、内部の消失模型を加熱等の手段で溶かし
出し、消失模型の抜けた所に溶融金属を注湯して鋳物を
作る方法である。(Conventional technology) Precision casting can produce castings with extremely high dimensional accuracy compared to conventional casting methods, so it is used to manufacture items that cannot be machined or items that would be costly to machine. It has been rapidly progressing and becoming popular in recent years. As is well known, the precision casting method involves three steps: coating the surface of the vanishing model with precision casting mold slurry (hereinafter referred to as slurry) made of refractory powder and binder, sanding with refractory stucco sand, and drying. By repeating this process several times, a ceramic shell layer with the required thickness is formed, and then the internal disappearing model is melted out by heating or other means, and molten metal is poured into the areas where the disappearing model has escaped to form a casting. This is the way to make it.
しかしながら、上記の精密鋳造方法においては、使用す
るスラリーの性質によって、鋳型作成中に鋳型にクラッ
クが生しることがある。特に、大きいクラックが生成す
ると、鋳型の強度が不十分となるため、その後の鋳造が
不可能となる。上記クラックの発生は、スラリーを消失
模型に塗布し、乾燥し、脱型する工程において、コーテ
ィングの乾燥収縮が大きいことに起因し、特に鋳型の生
産能率の向上を図り強制乾燥を行う場合に起こりやすい
。However, in the precision casting method described above, cracks may occur in the mold during mold creation depending on the properties of the slurry used. In particular, when large cracks form, the strength of the mold becomes insufficient, making subsequent casting impossible. The occurrence of the above cracks is due to the large drying shrinkage of the coating during the process of applying slurry to the disappearing model, drying it, and removing it from the mold.This occurs especially when forced drying is performed to improve mold production efficiency. Cheap.
従来、クラック発生を減少させるための簡単な手段とし
ては、耐火粉末の含有率を高めたスラリーを用いる方法
があった。Conventionally, as a simple means to reduce the occurrence of cracks, there has been a method of using a slurry with an increased content of refractory powder.
（発明が解決しようとする課題）
しかしながら、耐火粉末の含有率を高める方法において
は、スラリーの粘度が高くなりすぎると、）Ｕ濁固形分
の沈降あるいは固結が起こりやすくなるため、粘度の増
加は僅かにしか達成できず、従って、クランクの防止効
果も僅かである。しかも、耐火粉末の沈降・固結を防く
ためにスラリーの撹拌を強くすると、スラリーの劣化が
早まるため、スラリーの使用期間も非常に限られて（る
といった問題があった。(Problem to be Solved by the Invention) However, in the method of increasing the content of refractory powder, if the viscosity of the slurry becomes too high, sedimentation or caking of U-turbid solids tends to occur, so the viscosity increases. can only be achieved to a small extent, and therefore the effect of preventing cranking is also small. Furthermore, if the slurry is strongly stirred to prevent settling and caking of the refractory powder, the slurry will deteriorate more quickly, and the period of use of the slurry will be extremely limited.
バインダーとしては、通常、エチルシリケートの加水分
解液とコロイダルシリカの２種類が使用されており、模
型の種類によって使い分けられている。バインダーとし
てコロイダルシリカを用いたスラリーのクラック防止効
果の改良は、特公昭５５−１１４２０号に記載されてい
る。本発明においては、エチルシリケートの加水分解１
佼をバインダーとするスラリーについて、クラックの発
生を防止し、しかも沈降・固結を生じることのないスラ
リーを提供することを目的とする。Two types of binders are usually used: ethyl silicate hydrolyzate and colloidal silica, which are used depending on the type of model. An improvement in the crack prevention effect of a slurry using colloidal silica as a binder is described in Japanese Patent Publication No. 11420/1983. In the present invention, hydrolysis of ethyl silicate 1
The purpose of the present invention is to provide a slurry that prevents the occurrence of cracks and does not cause sedimentation or caking, regarding a slurry using porcelain as a binder.
（課題を解決するための手段）
上記の目的を達成するだめに、本発明の精密鋳造用鋳型
スラリーは、耐火粉末、エチルシリケートの加水分解液
及び該エチルシリケートのｊＪｎ水分水分解列して０．
０１〜１５重量％の粘度低下剤を含有することを特徴と
する。(Means for Solving the Problems) In order to achieve the above object, the precision casting mold slurry of the present invention contains a refractory powder, a hydrolyzed solution of ethyl silicate, and a jJn moisture hydrolysis sequence of the ethyl silicate. ．．
It is characterized by containing 01 to 15% by weight of a viscosity reducing agent.
本発明のスラリーとして使用しうる粘度低下剤としては
、エチレングリコールに代表されるグリコール誘導体が
挙げられる。その添加量は、エチルシリケートの加水分
解液に対して０．０１〜１５重量％である。これは、添
加量が１５重景％を超えると、スラリーにおいて、エチ
ルシリケートの加水分解液のバインダーとしての機能が
失われることになり、また、添加量がｏ、ｏｉ％未満で
は、本発明の目的が充分に達成されず、耐火粉末の沈着
・固結が起こるためである。Examples of viscosity reducing agents that can be used in the slurry of the present invention include glycol derivatives typified by ethylene glycol. The amount added is 0.01 to 15% by weight based on the hydrolyzed solution of ethyl silicate. This is because if the amount added exceeds 15%, the function of the ethyl silicate hydrolyzate as a binder will be lost in the slurry, and if the amount added is less than 0%, the function of the binder will be lost. This is because the purpose is not fully achieved and the refractory powder is deposited and solidified.
本発明のスラリーは、鋳型製造の際に、全ての層に用い
てもよいが、初層のみに用いてもクランク防止効果を得
ることができる。The slurry of the present invention may be used in all layers during mold manufacturing, but the anti-crank effect can be obtained even if it is used only in the first layer.
（作用）
本発明のスラリーにおいては、粘度低下剤を０．０１−
１５％含有するため、耐火粉末の添加量を従来より５〜
２０％程度増加しても、沈着・固結が起こらない。従っ
て、これを使用することにより、クラックを発生するこ
となく精密鋳造用鋳型を製造することができる。(Function) In the slurry of the present invention, a viscosity reducing agent of 0.01-
Since it contains 15%, the amount of refractory powder added is 5 to 5% more than before.
Even if it increases by about 20%, no deposition or caking occurs. Therefore, by using this, precision casting molds can be manufactured without generating cracks.
（実施例）
第１図及び第２図はそれぞれ本実施例において使用した
消失模型の平面図及び正面図である。(Example) FIGS. 1 and 2 are a plan view and a front view, respectively, of a vanishing model used in this example.
この模型５は尿素系材料を用いて射出成形により作成し
たもので、図中、■は湯口部、２は湯道部、３は皿部、
４は製品部である。該消失模型５を用いて、本発明のス
ラリーを初層用スラリーとして用いて、精密鋳造用鋳型
を製造した。This model 5 was made by injection molding using a urea-based material, and in the figure, ■ is the sprue part, 2 is the runner part, 3 is the dish part,
4 is the product department. A precision casting mold was manufactured using the vanishing model 5 and the slurry of the present invention as a slurry for the initial layer.
実施例：
まず、下記の方法により初層用スラリーを製造する。バ
インダーとしてのエチルシリケートの加水分解液（Ｓｉ
Ｏｚ ２０重量％） １０００重附部に、耐火粉末と
してのジルコンフラワー＃３５０を４５００重量部添加
する （粘度；ザーンカップＮ０１５で２０秒）。これ
に粘度低下剤を２０重量部添加する（粘度：ザーンカッ
プＮ０９５で１３秒）。その後、さらにジルコンフラワ
ー３００重量部を添加して本発明に用いる初層用スラリ
ーとする（粘度：ザーンカップＮα５で２０秒）。Example: First, a slurry for the first layer is manufactured by the following method. Ethyl silicate hydrolyzate (Si
4,500 parts by weight of zircon flour #350 as a refractory powder was added to 1,000 parts by weight (viscosity: 20 seconds with Zahn cup N015). 20 parts by weight of a viscosity reducing agent is added to this (viscosity: 13 seconds with Zahn cup N095). Thereafter, 300 parts by weight of zircon flour is further added to prepare a slurry for the initial layer used in the present invention (viscosity: 20 seconds at Zahn cup Nα5).
次に、バンクアップ用スラリーを、上記のエチルシリケ
ートの加水分解液１０００重量部にジルコンフラワー＃
３５０を４０００重量部添加する （粘度；ザーンカッ
プＮα５で８秒）ことにより製造する。Next, the bank-up slurry was added to 1000 parts by weight of the above ethyl silicate hydrolyzate and zircon flour #
350 (viscosity: 8 seconds at Zahn cup Nα5).
上記で製造した初層用ス、ラリ−に、消失性模型５を浸
漬してコーティングを施し、これに溶融シリカ＃４８〜
１００をサンディングした後、乾燥させ、第１層を形成
させた。さらに、スラリーとしてバックアップ用スラリ
ー、スタッコ砂としてハイアルミナサンド０．３〜０．
７ ｎｕｎを用いて第２〜６層を順次積層させた。最後
に加熱することにより、消失模型を溶かして取り除き、
その後、更に加熱して尿素系材料を完全に消失させると
ともに、シェル層を焼成して精密鋳造用鋳型を造型した
。The fugitive model 5 was dipped into the slurry for the first layer produced above to coat it, and this was coated with fused silica #48~
After sanding 100, it was dried to form the first layer. Furthermore, a backup slurry is used as the slurry, and high alumina sand is used as the stucco sand.
The second to sixth layers were sequentially laminated using 7nun. Finally, by heating, the disappearing model is melted and removed.
Thereafter, the urea-based material was further heated to completely disappear, and the shell layer was fired to form a precision casting mold.
比較例１及び２：
初層用スラリーとして、下記のスラリーを使用する以外
は、全て実施例と同様にして、精密鋳造用鋳型を造型し
た。Comparative Examples 1 and 2: Precision casting molds were molded in the same manner as in the examples except that the following slurry was used as the slurry for the first layer.
比較例１の初層用スラリｍ；バインダー１０００重量部
にジルコンフラワー＃３５０を４５００重量部添加する
。 （粘度、ザーンカップＮｏ、 ５で２０秒）比較例
２の初層用スラリー：バインダー１０００重量部にジル
コンフラワー＃３５０を４８００重量部添加する。 （
粘度、ザーンカップＮｏ、 ５で３１秒）上記実施例及
び比較例１．２において、初層用スラリーの寿命を調べ
るとともに、造型した各々１０個の鋳型について、クラ
ックの発生状況を脱型（消失模型の溶出）の前後で確認
する。First layer slurry M of Comparative Example 1: 4500 parts by weight of zircon flour #350 is added to 1000 parts by weight of binder. (Viscosity, Zahn Cup No. 5, 20 seconds) First layer slurry of Comparative Example 2: 4,800 parts by weight of Zircon Flour #350 was added to 1,000 parts by weight of the binder. (
Viscosity, Zahn Cup No., 31 seconds at 5) In the above Examples and Comparative Example 1.2, the life of the slurry for the first layer was investigated, and the occurrence of cracks was investigated for each of the 10 molds produced by demolding (disappearance). Check before and after model elution).
結果を第１表に示す。The results are shown in Table 1.
第１Ｊ。1st J.
表より明らかなように、比較例１ではクランクの発生数
が多く、比較例２ではクラックが発生し、しかも初層用
スラリーの寿命が短いのに対し、本発明の実施例におい
ては、クランクの発生を防止することができ、しかも初
層用スラリーの寿命も問題なかった。As is clear from the table, in Comparative Example 1, a large number of cranks occurred, and in Comparative Example 2, cracks occurred, and the life of the slurry for the first layer was short. This could be prevented, and there was no problem with the life of the slurry for the first layer.
（発明の効果）
本発明のスラリーにおいては、粘度低下剤を０．０１〜
１５％含有するため、耐火粉末の添加量を従来より５〜
２０％程度増加することができ、精密鋳造鋳型を製造に
おけるクランクの発生数を大幅に減少することができる
。(Effect of the invention) In the slurry of the present invention, the viscosity reducing agent is
Since it contains 15%, the amount of refractory powder added is 5 to 5% more than before.
The number of cranks can be increased by about 20%, and the number of cranks produced in precision casting molds can be significantly reduced.
第１図は、本発明の一実施例において使用する消失模型
の上面図、第２図は第１図の消失模型の正面図である。
１・・・湯口部 ２・・・湯道部３・・・皿部
４・・・製品部５・・・消失模型
第１図
第２図FIG. 1 is a top view of a vanishing model used in an embodiment of the present invention, and FIG. 2 is a front view of the vanishing model of FIG. 1. 1... Sprue part 2... Runway part 3... Dish part 4... Product part 5... Vanishing model Fig. 1 Fig. 2
Claims (1)
シリケートの加水分解液に対して０．０１〜１５重量％
の粘度低下剤を含有する精密鋳造鋳型用スラリー。0.01 to 15% by weight based on the refractory powder, the hydrolyzed solution of ethyl silicate, and the hydrolyzed solution of the ethyl silicate
Slurry for precision casting molds containing a viscosity reducing agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63054293A JPH078405B2 (en) | 1988-03-08 | 1988-03-08 | How to make a precision casting mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63054293A JPH078405B2 (en) | 1988-03-08 | 1988-03-08 | How to make a precision casting mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01228640A true JPH01228640A (en) | 1989-09-12 |
| JPH078405B2 JPH078405B2 (en) | 1995-02-01 |
Family
ID=12966521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63054293A Expired - Fee Related JPH078405B2 (en) | 1988-03-08 | 1988-03-08 | How to make a precision casting mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH078405B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102744368A (en) * | 2012-07-19 | 2012-10-24 | 无锡范尼韦尔工程有限公司 | Method for maintaining viscosity of sizing agent for investment casting shell |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4880619A (en) * | 1972-02-03 | 1973-10-29 |
-
1988
- 1988-03-08 JP JP63054293A patent/JPH078405B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4880619A (en) * | 1972-02-03 | 1973-10-29 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102744368A (en) * | 2012-07-19 | 2012-10-24 | 无锡范尼韦尔工程有限公司 | Method for maintaining viscosity of sizing agent for investment casting shell |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH078405B2 (en) | 1995-02-01 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |