JPH0471752A - Method for forming hollow core - Google Patents
Method for forming hollow coreInfo
- Publication number
- JPH0471752A JPH0471752A JP18065590A JP18065590A JPH0471752A JP H0471752 A JPH0471752 A JP H0471752A JP 18065590 A JP18065590 A JP 18065590A JP 18065590 A JP18065590 A JP 18065590A JP H0471752 A JPH0471752 A JP H0471752A
- Authority
- JP
- Japan
- Prior art keywords
- core
- hollow
- sand
- hollow core
- hollow 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 39
- 239000004576 sand Substances 0.000 claims abstract description 27
- 238000000465 moulding Methods 0.000 claims abstract description 23
- 239000011347 resin Substances 0.000 claims abstract description 17
- 229920005989 resin Polymers 0.000 claims abstract description 17
- 239000002904 solvent Substances 0.000 claims abstract description 9
- 239000003208 petroleum Substances 0.000 claims abstract description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 239000004848 polyfunctional curative Substances 0.000 abstract description 3
- 239000006260 foam Substances 0.000 abstract 4
- 238000004140 cleaning Methods 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 24
- 239000007789 gas Substances 0.000 description 5
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 229920006248 expandable polystyrene Polymers 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011796 hollow space material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920001228 polyisocyanate Polymers 0.000 description 1
- 239000005056 polyisocyanate Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000013585 weight reducing agent 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
本発明は、中空部を有する鋳物用中子に適用される中空
中子成形法に関し、特に、コールドホックス法や自硬性
鋳型などを使用した中空中子の成形に適した方法に関す
る。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hollow core molding method applied to foundry cores having a hollow part, and in particular, to a method for molding a hollow core using a cold hox method, a self-hardening mold, etc. Concerning methods suitable for molding children.
従来の技術
鋳物に中空部を作る目的で主型の所定の位置に配設され
る中子は、中子自身の軽量化や鋳込時に発生するガス対
策などを考慮して、中空形状とするのが一般的である。Conventional technologyThe core, which is placed in a predetermined position in the main mold to create a hollow part in the casting, is made hollow in order to reduce the weight of the core itself and to prevent gases generated during casting. is common.
そこで、従来の中空中子成形法を第4図及び第5図に基
づいて簡単に説明する。第4図はマンドレル(入子中子
)を使用した成形法を示しており、中子型の所定の位置
にマンドレル9をセットして砂づめ造型後、中空中子l
からマンドレル9を弓き抜いて中空部2を形成するもの
である。また、第5図は、シェルモールド法による中空
中子成形法を示しており、加熱した中子型5′にシェル
砂を吹き込み、一定時間経過後に中子型を反転して内部
に残った未硬化部分の砂10を排出することにより、こ
のシェル砂の存在した部分が中空中子lの中空部2とな
るものである。Therefore, the conventional hollow core molding method will be briefly explained based on FIGS. 4 and 5. Figure 4 shows a molding method using a mandrel (nested core), in which the mandrel 9 is set in a predetermined position of the core mold, and after sand-filled molding, the hollow core l
The hollow part 2 is formed by punching out the mandrel 9 from the mandrel 9. Fig. 5 shows a hollow core molding method using the shell mold method, in which shell sand is blown into a heated core mold 5', and after a certain period of time, the core mold is turned over to remove any unremoved residue inside. By discharging the hardened sand 10, the part where the shell sand was present becomes the hollow part 2 of the hollow core l.
発明が解決しようとする課題
ところで、前述した従来の中空中子成形法は、いずれも
次のような問題点を有している。Problems to be Solved by the Invention The conventional hollow core molding methods described above all have the following problems.
すなわち、マンドレルを引き抜いて中空部を形成する第
1従来例の場合は、これを適用できる中子の形状に制限
を受け、たとえば第1図に示す如く、マンドレルの抜き
穴を十分に確保できない形状や複雑な形状のものに適用
するのは困難であった。このため、第1従来例の中空中
子成形法を適用できない場合には、第2従来例に示した
如く、フェルモールド法による反転落下方式で中空中子
を造形していた。しかしながら、この反転落下方式によ
る中空中子の造形は、コールドボックス法や自硬性鋳型
などを使用した場合には適用することができなかった。In other words, in the case of the first conventional example in which a hollow part is formed by pulling out a mandrel, there are restrictions on the shape of the core to which this can be applied. It was difficult to apply it to objects with complex shapes. For this reason, when the hollow core molding method of the first conventional example cannot be applied, the hollow core is formed by an inverted drop method using the Fermold method, as shown in the second conventional example. However, modeling of hollow cores using this inverted drop method could not be applied when using a cold box method or a self-hardening mold.
本発明は、上記の事情に鑑みてなされたもので、その目
的とするところは、中子の形状にとられれることなくコ
ールドボックス法や自硬性鋳型を使用して中空中子の造
形ができる中空中子成形法を提供することである。The present invention was made in view of the above-mentioned circumstances, and its purpose is to be able to mold a hollow core using a cold box method or a self-hardening mold without depending on the shape of the core. An object of the present invention is to provide a hollow core molding method.
課題を解決するための手段
本発明は、前述の課題を解決するもので、中子型の所定
の位置に発泡樹脂製の模型を配設した後砂づめをし、該
砂に含まれる硬化剤中の石油系溶剤と発泡樹脂との反応
によって、前記模型を収縮させて中子の中空部を形成し
たことを特徴とする中空中子成形法である。Means for Solving the Problems The present invention solves the above-mentioned problems. After placing a foamed resin model in a predetermined position of a core mold, it is filled with sand, and a curing agent contained in the sand is removed. This hollow core molding method is characterized in that the model is contracted by a reaction between a petroleum solvent and a foamed resin to form a hollow part of the core.
作用
前述の手段によれば、中空中子の中空部に相当する位置
に発泡樹脂製の模型を配設して砂づめをするので、この
砂に含まれている硬化剤中の石油系溶剤と発泡樹脂とが
反応し、発泡樹脂性の模型が収縮して中子に中空部が形
成される。Effect According to the above-mentioned method, a model made of foamed resin is placed at a position corresponding to the hollow part of the hollow core and filled with sand, so that the petroleum solvent in the hardening agent contained in this sand is removed. The foamed resin reacts with the molded resin, and the foamed resin model contracts, forming a hollow part in the core.
実施例
本発明による中空中子成形法の一実施例を第1図ないし
第3c図に基づいて説明する。第1図及び第2図は中空
中子の中空部形成を説明するための断面図、第38図な
いし第3C図はコールドボックス法による中空中子の造
型手順を示す図である。Embodiment An embodiment of the hollow core molding method according to the present invention will be described with reference to FIGS. 1 to 3c. 1 and 2 are cross-sectional views for explaining the formation of the hollow part of the hollow core, and FIGS. 38 to 3C are diagrams showing the procedure for molding the hollow core by the cold box method.
鋳物に中空部を形成する中子は、軽量化やガス抜き対策
などのため中空形状のものが採用されている。この中空
中子lをコールドボックス法で造型する場合、最初に中
空中子lの中空部2に相当する形状の模型3を、発泡ポ
リスチレンや発泡ポリメタクリルなどの発泡樹脂で製作
する。発泡樹脂は非常に軽く(たとえば、発泡ポリスチ
レンの比重は0.02〜0.04)、かつ加工性も良好
である。The core that forms the hollow part in the casting is hollow to reduce weight and prevent gas release. When molding this hollow core 1 by the cold box method, first a model 3 having a shape corresponding to the hollow part 2 of the hollow core 1 is manufactured from a foamed resin such as foamed polystyrene or foamed polymethacrylic. The foamed resin is very light (for example, the specific gravity of foamed polystyrene is 0.02 to 0.04) and has good processability.
次に、製作された発泡樹脂製の模型3を、心金4を支持
部材として中子型5の所定の位置に配設する。この後、
中子型5に砂づめをするが、この砂づめは、吹込式造型
機6を使用してもよいし、あるいは手込め造型でもよい
。なお、コールドボックス法で使用される砂7は、けい
砂に硬化剤(粘結剤)としてフェノールレジンとポリイ
ソシアネ−ト(M、D、1.)とが適量加えられて混合
されたものである。こうして砂づめが完了した後、模型
3の外周部に造型された中空中子lにトリエチルアミン
などのアミンガスを吹き込むことにより、該アンガスが
砂7の硬化剤と反応して中空中子lは瞬間的に硬化する
。なお、硬化が完了した後には反応の終ったガス及び未
反応のガスを空気により排出し、排気浄化槽8に導いて
浄化する。Next, the produced model 3 made of foamed resin is placed in a predetermined position of the core mold 5 using the mandrel 4 as a supporting member. After this,
The core mold 5 is filled with sand, and this sand filling may be done by using a blow molding machine 6 or by manual molding. The sand 7 used in the cold box method is a mixture of silica sand with appropriate amounts of phenol resin and polyisocyanate (M, D, 1.) added as hardeners (binding agents). . After sand filling is completed in this way, by blowing amine gas such as triethylamine into the hollow core L formed on the outer periphery of the model 3, the Angus reacts with the hardening agent of the sand 7, and the hollow core L is instantly hardens to. Furthermore, after the curing is completed, the reacted gas and unreacted gas are discharged by air and introduced into the exhaust purification tank 8 for purification.
ところで、発泡ポリスチレンなどの発泡樹脂は、コール
ドボックス法で使用される砂に含まれている硬化剤中の
石油系溶剤と反応して収縮する性質を有している。この
ため、中子型5に砂づめがなされると、発泡樹脂製の模
型3は砂7と接触し、該砂に含まれている石油系溶剤と
の反応によってゆっくりと収縮する。そして、第1図に
示す如く、模型3の外周で瞬間的に硬化した砂7に囲ま
れている模型3の収縮が完了すると、第2図に示す如く
、模型3の存在した位置に中空部2が形成される。この
後、心金4を抜き取って中空中子lの造型が完了する。By the way, foamed resins such as foamed polystyrene have the property of shrinking by reacting with the petroleum-based solvent in the curing agent contained in the sand used in the cold box method. Therefore, when the core mold 5 is filled with sand, the foamed resin model 3 comes into contact with the sand 7 and slowly shrinks due to the reaction with the petroleum solvent contained in the sand. As shown in FIG. 1, when the shrinkage of the model 3, which is surrounded by instantaneously hardened sand 7 on the outer periphery of the model 3, is completed, a hollow space is formed at the position where the model 3 was, as shown in FIG. 2 is formed. Thereafter, the mandrel 4 is removed and the molding of the hollow core 1 is completed.
この時、収縮した模型3′が中空部に残されるが、中空
中子lの軽量化やガス抜きに支障をきたすことはない。At this time, the shrunken model 3' is left in the hollow portion, but this does not interfere with the weight reduction or degassing of the hollow core l.
また、模型3の収縮を促進したい場合には、模型3と一
体の中空中子lを80〜120℃程度に熱すると効果的
である。Moreover, when it is desired to promote the contraction of the model 3, it is effective to heat the hollow core l integrated with the model 3 to about 80 to 120°C.
上述したような中空中子成形法を採用すると、所望の形
状の中空部に合わせて発泡樹脂製の模型を作り、中子型
内で該模型の外周に吹き込んだ砂を硬化させた後、石油
系溶剤と反応した模型が収縮して中空部を形成するので
、中空部の形状が複雑な中空中子や、あるいは、マンド
レルの抜き穴を確保できないような形状の中空中子であ
っても、中子や中空部の形状にとられれることなく、コ
ールドボックス法による中子成形を容易に実施すること
ができる。When the hollow core molding method described above is adopted, a model made of foamed resin is made to fit the hollow part of the desired shape, and after hardening the sand blown around the outer periphery of the model in the core mold, oil The model reacts with the solvent and shrinks to form a hollow part, so even if the hollow part has a complicated shape or a shape that makes it impossible to secure a hole for the mandrel, Core molding by the cold box method can be easily carried out without having to worry about the shape of the core or hollow part.
なお、上記実施例は、本発明による中空中子成形法をコ
ールドボックス法に適用した場合を示して説明したが、
本発明は、コールドボックス法の他にも、石油系溶剤を
含んだ砂を使用する自硬性鋳型などにも適用可能なこと
は言うまでもない。In addition, although the above-mentioned example showed and explained the case where the hollow core molding method according to the present invention was applied to the cold box method,
It goes without saying that the present invention is applicable not only to the cold box method but also to self-hardening molds using sand containing petroleum solvents.
発明の効果
前述した本発明によれば、コールドボックス法や自硬性
鋳型で所望の形状の中空部を形成できるようになり、成
形可能な中空中子の形状及びその成形性選択の自由度が
増す。従って、所望の形状の中空中子を、その形状、精
度及びコストなどの優劣を考慮し、最適の成形法を採用
して造形することができるようになる。Effects of the Invention According to the present invention described above, it becomes possible to form a hollow portion of a desired shape using a cold box method or a self-hardening mold, increasing the degree of freedom in selecting the shape of a moldable hollow core and its moldability. . Therefore, it becomes possible to mold a hollow core of a desired shape by adopting the most suitable molding method, taking into consideration the advantages and disadvantages of the shape, precision, cost, etc.
図面は本発明による中空中子成形法の一実施例を示すも
ので、第1図及び第2図は中空中子の中空部形成を説明
するための図であって、第1図は中空部形成前の断面図
、第2図は中空部形成後の断面図、第3a図ないし第3
c図はコールドボックス法による中空中子の造型手順を
示す図、第4図及び第5図は従来例を示す図である。
!・・中空中子、2・・中空部、
4・・心金、5・・中空型、6・・
7・・砂、8・・排気浄化槽、9・The drawings show an embodiment of the hollow core molding method according to the present invention, and FIGS. 1 and 2 are diagrams for explaining the formation of the hollow part of the hollow core, and FIG. 1 shows the hollow part. Figure 2 is a cross-sectional view before forming the hollow part, Figures 3a to 3 are cross-sectional views after forming the hollow part.
Fig. c shows the procedure for forming a hollow core by the cold box method, and Figs. 4 and 5 show conventional examples. ! ...Hollow core, 2.Hollow part, 4. Core metal, 5.Hollow type, 6.. 7.Sand, 8.Exhaust septic tank, 9.
Claims (1)
づめをし、該砂に含まれる硬化剤中の石油系溶剤と発泡
樹脂との反応によって、前記模型を収縮させて中子の中
空部を形成したことを特徴とする中空中子成形法。After a foamed resin model is placed in a predetermined position in the core mold, it is filled with sand, and the foamed resin shrinks due to the reaction between the petroleum solvent in the hardening agent contained in the sand and the foamed resin. A hollow core molding method characterized by forming a hollow part of the core.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18065590A JPH0832353B2 (en) | 1990-07-10 | 1990-07-10 | Hollow core molding method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18065590A JPH0832353B2 (en) | 1990-07-10 | 1990-07-10 | Hollow core molding method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0471752A true JPH0471752A (en) | 1992-03-06 |
JPH0832353B2 JPH0832353B2 (en) | 1996-03-29 |
Family
ID=16087001
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18065590A Expired - Lifetime JPH0832353B2 (en) | 1990-07-10 | 1990-07-10 | Hollow core molding method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0832353B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100288460A1 (en) * | 2009-05-15 | 2010-11-18 | Gm Global Technology Operations, Inc. | Method of forming a hollow sand core |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104190872B (en) * | 2014-09-12 | 2016-03-30 | 苏州明志科技有限公司 | A kind of material-saving core and core-making method thereof |
-
1990
- 1990-07-10 JP JP18065590A patent/JPH0832353B2/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100288460A1 (en) * | 2009-05-15 | 2010-11-18 | Gm Global Technology Operations, Inc. | Method of forming a hollow sand core |
US8091608B2 (en) * | 2009-05-15 | 2012-01-10 | GM Global Technology Operations LLC | Method of forming a hollow sand core |
Also Published As
Publication number | Publication date |
---|---|
JPH0832353B2 (en) | 1996-03-29 |
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