JPH0237934A - Method for joining lost foam pattern - Google Patents

Abstract

PURPOSE:To easily and accurately form a formed product without any question to the strength by pressing template for applying adhesive to each joining face of the divided pattern to transfer hot melt type adhesive to each joining face, successively facing joining faces between themselves, joining and integrating. CONSTITUTION:Two divided patterns Wa, Wb of foamed polystyrene formed with a metallic mold are shifted to above the adhesive vessel 3 with the joining faces Ta, Tb downward and positioned. The adhesive vessel 3 melts the hot melt type adhesive (q) at the range of the prescribed viscosity in the range of the prescribed temp. When the divided patterns Wa, Wb come to shift, to there, the adhesive (q) is stuck to the top parts of the tenplates 6, 6 and the top faces are press-contacted with pressurizing force at the degree, which is possible to return back to the original shapes of the joining faces Ta, Tb, to stick the adhesive (q) as thin film state. The other side of divided pattern Wb is turned over and both divided patterns are press-contacted and integrated. By this method, both divided patterns are firmly integrated with the min. adhesive and finish work after forming is not necessary and the formed product without any question to the strength can be formed.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は鋳造用の消失性分割模型を接合する方法に閉す
る。DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention is directed to a method of joining fugitive segmented models for casting.

（従来技術） 精凹鋳造用としで使用される消失性の模型は、一般に成
形金型を用いて型込め成形するかブロック状の発泡体か
ら切出し成形するかして所要の型に成形され、また特に
形状等が複雑なものは、部分的に成形した複数の模型を
互いに接着剤等により接合して一つの模型として成形さ
れる。ところで、このような分割模型の接合には、加熱
溶融したホットメルト型接着剤をテンプレートによって
一方の模型の接合面に塗布し、その上に他方の模型を圧
接することにより行なわれるが、この種の分割模型では
、ＷＺ着剤の塗布量如何によって製品に大きな杉Ｗを与
える。すなわち、接合面とテンプレートとの間にＯ，１
ｍｍ以上の隙間ヲ持たせて接着剤を転写させたような場
合には、接着剤の量が多すぎる結果、分割模型同士を強
く接合することができる反面、接合部の周縁に接着剤が
ハミ出して、鋳造した成品の周面に蓄状の凸部を作り出
すことになつ、その部分の削り取りに多大の工数が必要
になるほか、特にマニホールドの内面やシリンダヘッド
のボート内面にこのような凸部ができたような場合には
、仕上げ加工や修正加工を施すことができないため、こ
の種の鋳造に分割模型を用いることができないといった
ことにもなる。(Prior art) A fugitive model used for fine recess casting is generally molded into the required mold by molding using a molding die or by cutting and molding from a block-shaped foam. In addition, when the shape is particularly complex, a plurality of partially molded models are joined together with an adhesive or the like to form a single model. Incidentally, to join such split models, hot-melt adhesive is applied using a template to the joining surface of one model, and the other model is pressure-welded on top of it. In the split model, a large cedar W is given to the product depending on the amount of WZ adhesive applied. In other words, there is a gap of O,1 between the bonding surface and the template.
If the adhesive is transferred with a gap of mm or more, the amount of adhesive will be too large, and although the divided models can be strongly joined together, the adhesive will get stuck around the periphery of the joint. This results in the creation of accumulation-like protrusions on the circumferential surface of the cast product, which requires a large amount of man-hours to scrape off. If a part is formed, finishing or correction cannot be performed, which means that a split model cannot be used for this type of casting.

また、逆に接合面にテンプレートを強く接触させたよう
な場合には、Ｗｉ着剤の量が少なすぎてしまう関係上、
上記したような問題は派生しないが、反面、分割模型を
接合させた際わずかな接着剤の一部が他方の接合面に存
在する凹部内に取り込まれて接着剤をざらに不足させる
結果、接合部の周囲に凹みが生じて、鋳造した成品に帯
状の凹みを作り出し、これがもとで特に大きな応力が作
用する部品にあってはその部分に応力集中を生じさせて
部品を破断させてしまう問題を生じる。On the other hand, if the template is brought into strong contact with the joint surface, the amount of Wi adhesive will be too small.
Although the above-mentioned problems do not arise, on the other hand, when the split models are joined together, a small portion of the adhesive is taken into the recess that exists on the other joint surface, causing a rough shortage of adhesive. The problem is that dents occur around the parts, creating belt-shaped dents in the cast product, and this causes stress concentration in those parts, causing the parts to break, especially in parts where large stress is applied. occurs.

（発明が解決しようとする課題） 本発明はこのような問題に鑑みてなされたもので、その
目的とするところは、接合面に塗布する接着剤の塗布Ｉ
Ｉを正確にコントロールして分割模型同士を接合する新
たな接合方法を提案することにある。(Problems to be Solved by the Invention) The present invention has been made in view of the above problems, and its purpose is to improve the application of adhesive to the joint surface.
The purpose of this study is to propose a new joining method for joining split models by accurately controlling I.

（課題を解決するための手段） すなわち、本発明はかかる課題を達成するための分割模
型の接合方法として、鋳造用消失性分割模型の各接合面
に接着剤塗布用のテンプレートを押圧してこれらの接合
面にホットメルト型接着剤を転写し、ついでこれらの接
合面同士を対向させて分割模型を接合し一体化するよう
にしたものである。(Means for Solving the Problems) That is, the present invention provides a method for joining split models to achieve the above-mentioned problems, by pressing a template for applying adhesive onto each joining surface of a fugitive split model for casting. A hot-melt adhesive is transferred to the joint surfaces of the model, and then these joint surfaces are made to face each other to join and integrate the divided models.

（実施例） そこで以下に図示した実施例について説明する。(Example) Therefore, the illustrated embodiment will be explained below.

第１図は分割模型の接合法を模式的に示したもので、は
じめに金型によって予め型込め成形した発泡ポリスチレ
ンよつなる２つの分割模型Ｗａ、Ｗｂ（第３図）を担持
用治具１．１により把持し、それぞれの接合面Ｔａ、Ｔ
ｂａ下にして接着剤槽３の上方へ移送して位置決めする
（第１図（ａ　））。Fig. 1 schematically shows a method for joining split models. First, two split models Wa and Wb (Fig. 3) made of expanded polystyrene, which have been molded in advance using a mold, are attached to a supporting jig 1. .1, and each joint surface Ta, T
ba and move it above the adhesive tank 3 and position it (FIG. 1(a)).

一方、接着剤槽３は１０５℃乃至１２５°Ｃに設定され
た温度紀囲のもとて粘度が２．５乃至３．５ポアズセン
チとなるように予めホットメルト型接着剤ｑを溶融させ
ており、ここに分割模型Ｗａ、Ｗｂが移送されてくると
、頂部が接合面Ｔａ、Ｔｂと合致するように形成された
テンプレート６．６は、その頂部に接着剤ｑを付着させ
て槽３より上昇し、その頂面を各分割模型Ｗａ、Ｗｂの
接合面Ｔａ、ｖｂに対してその弾性変形の範囲内の加圧
力、つまり、接合面Ｔａ、Ｔｂが元の形状に復帰し得る
程度の加圧力、ざらに具体的には、接合面Ｔａ、Ｔｂが
０．２ｍｍ圧縮される程度の加圧力をもって圧接し、保
持した接着剤３をこれらの接合面Ｔａ、Ｔｂに転移させ
て、これらの面Ｔａ、Ｔｂに存在する微細な凹部に接着
剤ｑを充填させるとともに、接合面Ｔａ、Ｔｂ全面に接
着剤ｑを薄膜状に付着させる（第１図（ｂ　））。On the other hand, in the adhesive tank 3, the hot melt adhesive q is melted in advance so that the viscosity becomes 2.5 to 3.5 poise centimeters under a temperature range of 105°C to 125°C. When the divided models Wa and Wb are transferred here, the template 6.6, which is formed so that its top coincides with the bonding surfaces Ta and Tb, is raised from the tank 3 with adhesive q attached to its top. Then, the top surface is pressed against the joint surfaces Ta and vb of each of the divided models Wa and Wb within the range of their elastic deformation, that is, the pressure is such that the joint surfaces Ta and Tb can return to their original shapes. , More specifically, the bonding surfaces Ta and Tb are pressed together with pressure such that the bonding surfaces Ta and Tb are compressed by 0.2 mm, and the retained adhesive 3 is transferred to these bonding surfaces Ta and Tb. , Tb are filled with the adhesive q into minute recesses, and a thin film of the adhesive q is applied to the entire surface of the bonding surfaces Ta and Tb (FIG. 1(b)).

そして以上の接着剤転写工程が終了したら、つぎに一方
の分割模型Ｗｌｌｌ＋８０°反転し、その接合面Ｔｂを
他方の分割模型Ｗａの接合面Ｔａに相対向させたよ（篤
１図（Ｃ））、両者を圧接し一体化して（第１図（ｄ）
）模型の接着を完了する。After the above adhesive transfer process was completed, one of the divided models was reversed Wllll+80°, and its joint surface Tb was made to face the joint surface Ta of the other divided model Wa (Atsushi 1 (C)). Press them together and integrate them (Fig. 1(d))
) Complete gluing the model.

第２図はこの方法に使用される装置の一例を示したもの
で、分割模型Ｗを把持する把持用治具１には、テンプレ
ート支持板７と相対向する面に圧接規制用のスタッド２
．２を立設する一方、シリンダ４によって接着剤槽３か
ら出没し得るようロッド５端に取付（すたテンプレート
６の支持板フイこは、上記した圧接規制用のスタッド２
．２と相対向させて同じく圧接規制用のスタッド８．８
を立設して、分割模型Ｗの接合面Ｔとテンプレート６．
６との圧接力を両スタット２．８の高さにより調整する
ように構成したものである。FIG. 2 shows an example of a device used in this method, in which a gripping jig 1 for gripping the split model W includes a pressure-restricting stud 2 on the surface facing the template support plate 7.
．． 2 is installed upright, and the rod 5 is attached to the end of the rod 5 so that it can be moved out and out of the adhesive tank 3 by means of the cylinder 4.
．． 2 and the stud 8.8 which also controls pressure contact.
is erected to connect the joint surface T of the split model W and the template 6.
The pressure contact force with 6 is adjusted by the height of both studs 2.8.

（効果） 以上述べたように本発明によれば、消失性分割模型の各
接合面にテンプレートを押圧して接着剤を転写するよう
にしたので、テンプレートの押圧により各接合面に存在
する微小な凹部へ接着剤を強制的に充填しつつ接合面全
面に均一な接着剤の薄膜を形成することができて、これ
らの両接合面に薄く転写して接着剤の相互接着作用によ
り、最小の接着剤をもって両分側模型を強固に一体化す
ることかできる。しかも、接合面同士を接合するに当っ
て両面に存在する微小な凹部を接着剤により埋設するた
め、一方の接着剤が他面の凹部に入り込んで接着剤の不
足をきたしたり、分割模型同士の強圧により接着剤が接
合面の周縁にはみ出すといったことがなくなって、成形
後の仕上げ加工等を必要とすることなくかつ強度的にも
問題のない成形品を容易かつ正確に成形することができ
る。(Effects) As described above, according to the present invention, since the adhesive is transferred by pressing the template to each joint surface of the fugitive split model, the pressure of the template removes the minute particles present on each joint surface. It is possible to form a uniform thin film of adhesive on the entire joint surface while forcibly filling the recess with adhesive, and by transferring a thin film to both joint surfaces, the mutual adhesion of the adhesive can minimize adhesion. The two halves of the model can be firmly integrated using the adhesive. Moreover, when joining surfaces to be joined, tiny recesses existing on both sides are filled with adhesive, so the adhesive on one side may get into the recesses on the other side, causing a shortage of adhesive, or the split models may Since the adhesive does not protrude to the periphery of the joint surface due to strong pressure, it is possible to easily and accurately mold a molded product without any problems in terms of strength and without the need for finishing processing after molding.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図（ａ）乃至（ｄ）は本発明の一実施例をなす分割
模型の接合工程を示す図、第２図は同上方法に使用され
る装置の一例を示す図、第３図は同上方法により一体化
される分割模型の−２例を示した図である。 １・・・・把持用治具 ２・・・・圧接規制用スタッド ３・・・・接着剤槽 ６・・・・テンプレート ８・・・・圧接規制用スフラド Ｗ・・・・分割模型 ■・・・・接合面 ｑ・・・・ホットメルト型接着剤Figures 1 (a) to (d) are diagrams showing the joining process of split models that constitute an embodiment of the present invention, Figure 2 is a diagram showing an example of the apparatus used in the same method, and Figure 3 is the same as the above. It is a figure which showed -2 examples of the split model integrated by the method. 1... Gripping jig 2... Stud for pressure welding regulation 3... Adhesive tank 6... Template 8... Sphrad W for pressure welding regulation... Split model ■. ...Jointing surface q...Hot melt adhesive

Claims (1)

【特許請求の範囲】[Claims] 鋳造用消失性分割模型の各接合面に接着剤塗布用のテン
プレートを押圧して該各接合面にホットメルト型接着剤
を転写し、ついで該接合面同士を対向させて上記分割模
型を接合し一体とすることを特徴とする消失性分割模型
の接合方法。Press a template for adhesive application onto each joint surface of the fugitive split model for casting to transfer the hot melt adhesive onto each joint surface, and then join the split model with the joint surfaces facing each other. A method for joining evanescent split models, characterized by integrating them into one piece.