JPH01143736A - Method for assembling wax-made pattern in lost wax mold - Google Patents
Method for assembling wax-made pattern in lost wax moldInfo
- Publication number
- JPH01143736A JPH01143736A JP30131387A JP30131387A JPH01143736A JP H01143736 A JPH01143736 A JP H01143736A JP 30131387 A JP30131387 A JP 30131387A JP 30131387 A JP30131387 A JP 30131387A JP H01143736 A JPH01143736 A JP H01143736A
- Authority
- JP
- Japan
- Prior art keywords
- wax
- mold
- runner
- molten metal
- small piece
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000011248 coating agent Substances 0.000 abstract description 6
- 238000000576 coating method Methods 0.000 abstract description 6
- 239000011230 binding agent Substances 0.000 abstract description 5
- 238000000465 moulding Methods 0.000 abstract description 5
- 239000000919 ceramic Substances 0.000 abstract description 3
- 230000035699 permeability Effects 0.000 abstract 1
- 239000002184 metal Substances 0.000 description 26
- 238000005266 casting Methods 0.000 description 8
- 238000005495 investment casting Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 3
- 238000010304 firing Methods 0.000 description 2
- 239000003110 molding sand Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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］
本発明は精密鋳造法の一つとして知られているロストワ
ックス法による鋳型のロウ製原型の組立方法に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for assembling a wax master mold for a casting mold by the lost wax method, which is known as one of the precision casting methods.
［従来の技術］
ロストワックス法は、ロウで原型を作り、その表面に鋳
物砂を粘結剤を混じえてコーティングしこれを乾燥させ
た後加熱してロウを溶かし出して中空殻状の通気性鋳型
を製作しこれをさらに高温で焼成した後溶湯を注ぐもの
で、精密鋳造法の一つとして知られているとおりである
。[Conventional technology] The lost wax method creates a model with wax, coats its surface with molding sand mixed with a binder, dries it, and then heats it to melt the wax and create a hollow shell-like breathable model. This method involves making a mold, firing it at a higher temperature, and then pouring the molten metal into it, and is known as a precision casting method.
一方、特公昭５２−３８９２４号公報に開示されたロス
トワックス法における鋳込方法の改良は、米国の大手ロ
ストワックス品メーカーであるヒツチナー社が開発した
もので、減圧吸上精密鋳造法と称されており新技術とし
て当分野で注目を集めているものである０次にこの減圧
吸上精密鋳造法について第６ａ図〜第６ｄ図面の簡単な
説明する。第６ａ図において、１００は金属溶湯槽、１
０１はその上方に昇降自在に支持されたチャンバ、１０
３は鋳物砂を焼成して作られた鋳型である。鋳型１０３
はその一端に溶湯吸上管１０４が一体に形成されている
と共に該溶湯吸上管１０４の基部には膨径部１０５が形
成されている。この場合該吸上管１０４の膨径部１０５
より先をチャンバ１０１の底部開孔１０６から下方に突
出させて該チャンバ１０１内に設定する。そして該チャ
ンバ１０１を第６ｂ図に示したように下降させて吸上管
１０４の先端を溶湯中に浸漬する一方、吸気ロ１０７を
真空ポンプに継ぐことによって該チャンバ１０１内を減
圧する。そうすると鋳型１０３は通気性の中空殻状に作
られているのでその内部が減圧され吸上管１０４から溶
湯を吸引し該鋳型内が溶湯で満たされる。そこで第６ｃ
図に示したようにチャンバ１０１を上昇させ製品部内の
溶湯が凝固したところで減圧状態を解くことにより該鋳
型の湯道中にある未凝固の溶湯だけを流出させ湯道部を
空洞にする。この鋳型１０３を取り出して砂おどしをす
れば第６ｄ図に示したように製品１０８が取り出せるも
のである。On the other hand, the improved casting method in the lost wax method disclosed in Japanese Patent Publication No. 52-38924 was developed by Hutchner, a major lost wax product manufacturer in the United States, and is called the vacuum wicking precision casting method. This zero-order vacuum wicking precision casting method, which is attracting attention in this field as a new technology, will be briefly explained in FIGS. 6a to 6d. In FIG. 6a, 100 is a molten metal tank, 1
01 is a chamber supported above it so that it can be raised and lowered; 10
3 is a mold made by firing foundry sand. Mold 103
A molten metal suction pipe 104 is integrally formed at one end of the molten metal suction pipe 104, and an expanded diameter portion 105 is formed at the base of the molten metal suction pipe 104. In this case, the expanded diameter portion 105 of the suction pipe 104
The tip thereof is set in the chamber 101 with its tip protruding downward from the bottom opening 106 of the chamber 101. Then, as shown in FIG. 6b, the chamber 101 is lowered to immerse the tip of the suction pipe 104 into the molten metal, while the pressure inside the chamber 101 is reduced by connecting the suction tube 107 to a vacuum pump. Then, since the mold 103 is made in the shape of a breathable hollow shell, the pressure inside the mold is reduced, and the molten metal is sucked through the suction pipe 104, and the inside of the mold is filled with the molten metal. So the 6th c.
As shown in the figure, when the chamber 101 is raised and the molten metal in the product section solidifies, the reduced pressure is released, allowing only the unsolidified molten metal in the runner of the mold to flow out, making the runner section hollow. If this mold 103 is taken out and sanded, a product 108 can be taken out as shown in FIG. 6d.
しかしてこの減圧吸上精密鋳造法は、鋳型で直接に溶湯
を減圧吸引した後、湯道に入った溶湯が再び湯槽に戻さ
れ次の鋳型に吸引されるので鋳造歩留が７０％以上とな
り通常の取鍋を使う上注ぎ方法の３５〜４０％前後と比
較して大幅な歩留向上が見込めること、および、鋳型で
直接に溶湯を減圧吸引するために湯廻りがよく、複雑な
形状や極薄肉の製品などでも一体鋳造できること、溶湯
の汚染がなく品質が向上するなど種々の利点があるもの
である。However, in the vacuum suction precision casting method, the molten metal is vacuumed directly into the mold, and then the molten metal that enters the runner is returned to the molten metal bath and sucked into the next mold, resulting in a casting yield of over 70%. A significant improvement in yield is expected compared to around 35-40% for the top-pouring method that uses a regular ladle, and since the molten metal is vacuum-suctioned directly into the mold, the flow of the molten metal is good, and it is possible to handle complicated shapes and It has various advantages, such as being able to integrally cast even extremely thin products, and improving quality because there is no contamination of the molten metal.
［従来の技術の問題点］
しかるに従来の上記減圧吸上精密鋳造法のロウ製の原型
は機械的強度が小さいところからその製品成形部分が大
きいとその製品成形部分と湯道部とを継ぐ細いゲート部
にて鋳物砂コーティングのときに破断を起こし易くこの
ために極めて注意深い取抜いを必要としていた。特に粘
結剤を塗着するときにはまんべんなく塗着させるため原
型に回転を与える場合がありこのときに遠心力で製品成
形部分がゲート部から破断し易く、また、製品によって
は溶湯を入れたくない部分があるときは細径ワックスの
ライナーを用いていたが、鋳造後にその部分の余分な地
金取りを行なわなければならないという問題点があった
。[Problems with the conventional technology] However, the wax master mold of the conventional vacuum wicking precision casting method has low mechanical strength, so if the molded part of the product is large, a thin mold that connects the molded part of the product and the runner part is difficult to obtain. The gate part was prone to breakage when coated with foundry sand, which required extremely careful removal. In particular, when applying the binder, the master mold may be rotated to ensure even application, and at this time, the product molding part is likely to break from the gate part due to centrifugal force, and depending on the product, there are parts where you do not want to put molten metal. At one time, a thin wax liner was used, but this had the problem of having to remove excess metal from that area after casting.
［問題点を解決するための手段］
そこで本発明は大型製品の鋳造にも適するようにロスト
ワックス法鋳型の製造方法を改良しようとするものであ
る。その目的を達成するため本発明のロストワックス鋳
型のロウ製原型の組立方法は、ロウ製の原型の湯道に連
なる複数のゲートのう号少なくとも一つ以上のゲートに
耐熱性の小片を設けたことを特徴とするものである。[Means for Solving the Problems] Therefore, the present invention aims to improve the method of manufacturing a lost wax mold so that it is suitable for casting large-sized products. In order to achieve this purpose, the method for assembling a wax model of a lost wax mold of the present invention includes providing a small heat-resistant piece on at least one gate of a plurality of gates connected to the runner of the wax model. It is characterized by this.
［実施例コ
次に第１図乃至第５図に従い本発明の一実施例を減圧吸
上精密鋳造法の場合で説明する。第１図にロウ製の原型
を湯道部に固定する方法を示す。[Example 1] Next, an example of the present invention will be described using a vacuum suction precision casting method with reference to FIGS. 1 to 5. Figure 1 shows the method of fixing the wax model to the runner.
図中、１は湯道部、２は該その下方に延設された溶湯吸
上管部、３はその中間の膨径部、４は湯道１の上方に延
設されたロボット把持部、５は製品成形部、６は該製品
成形部５の上方に形成された押湯部、７は押湯部６の上
部と湯道部１とを継ぐゲート部を夫々示す。しかして、
８はセラミックス製の小片で、各小片の両端にはワック
スを接着しておき各小片の一端を湯道部１の一部１′に
接着して固定させ他の一端を製品成形部５の一部５′に
接着して固定する。このようにしてロウ製の原型と湯道
部との固定をする。しかしてこの原型１０の表面には粘
結剤および鋳物砂を交互に多層にコーティングすること
により第２図に示した通気性の鋳型１１を造る。その場
合小片８は製品成形部５を湯道部ｌに連結しているので
、コーティングの度に外力がかかつてもゲート部７にさ
ほどの負荷をかけることなくその破壊をまぬがれること
ができる。こうして出来た鋳型は粘結剤を乾燥させさら
にロウをとかし出した後、溶湯を鋳込む、即ち。In the figure, 1 is a runner, 2 is a molten metal suction pipe extending below the runner, 3 is an expanded diameter part in the middle, 4 is a robot gripping part extending above the runner 1, Reference numeral 5 indicates a product forming section, 6 indicates a riser section formed above the product forming section 5, and 7 indicates a gate section connecting the upper part of the riser section 6 and the runner section 1, respectively. However,
Reference numeral 8 denotes small pieces made of ceramics, wax is glued to both ends of each small piece, one end of each small piece is glued and fixed to a part 1' of the runner section 1, and the other end is attached to a part of the product forming section 5. It is fixed by adhering it to the portion 5'. In this way, the wax model and the runner are fixed. By coating the surface of the lever master mold 10 in multiple layers alternately with a binder and molding sand, an air-permeable mold 11 as shown in FIG. 2 is fabricated. In this case, since the small piece 8 connects the product forming part 5 to the runner part l, even if an external force is applied every time coating is applied, the gate part 7 can be prevented from being destroyed without applying a significant load. After drying the binder and melting the wax, the molten metal is poured into the mold thus created.
この実施例に示す減圧吸上鋳造法では第３図に示したよ
うにチャンバ１２の底部開口より溶湯吸上管部２を垂下
させ、該吸上管部の先端を溶湯中に浸漬し、チャンバ１
２内を減圧する。こうして鋳型１１内に溶湯を導入する
。そうして製品成形部５および押湯部６に溶湯が充満で
きたところで減圧状態を解除し湯道部１の溶湯を自重に
より第４図に示したように流出させる。そして揚湯部６
の溶湯荷重を製品成形部５の溶湯に負荷させつつ凝固さ
せ。In the vacuum wicking casting method shown in this embodiment, as shown in FIG. 1
Reduce the pressure inside 2. In this way, the molten metal is introduced into the mold 11. When the product forming section 5 and feeder section 6 are filled with the molten metal, the reduced pressure state is released and the molten metal in the runner section 1 is allowed to flow out due to its own weight as shown in FIG. 4. And fried water section 6
The molten metal in the product forming section 5 is solidified while applying a molten metal load of .
製品成形部５に引巣欠陥が発生するのを防止している。This prevents nesting defects from occurring in the product molding part 5.
なお、鋳造製品を取り出すに際しては小片８は切除され
る。Note that the small piece 8 is cut off when taking out the cast product.
小片８はこの実施例のように溶湯と反応するおそれのな
いセラミックス製のものが望ましいが、その他の耐熱材
を使用してもよい。It is preferable that the small piece 8 is made of ceramics, which is unlikely to react with the molten metal, as in this embodiment, but other heat-resistant materials may also be used.
［発明の効果コ
以上実施例について説明したように、本発明のロストワ
ックス鋳型のロウ製原型の組立方法は。[Effects of the Invention] As described in the embodiments above, the method for assembling a wax master model of a lost wax mold according to the present invention is as follows.
耐熱性の小片をもって原型の製品成形部を湯道部に連結
させるものであるので、製品成形部が大型であってもゲ
ート部のみに外力が負荷することなくその破断がまぬが
れる。このためコーティング作業が行い易くなり、また
余分なライナーを省略することができ製品表面仕上作業
等が容易になることによって作業性、生産性が向上する
有益な効果がある。Since the product molding part of the original model is connected to the runner part using a heat-resistant small piece, even if the product molding part is large, external force is not applied only to the gate part and breakage can be avoided. For this reason, coating work is easier to perform, and extra liners can be omitted, making it easier to finish the surface of the product, which has the beneficial effect of improving workability and productivity.
第１図〜第５図は本発明の一実施例を示したもので、第
１図は原型の縦断面図、第２図は鋳型の縦断面図、第３
図乃至第５図はその鋳型２の鋳込の行程を順に示した縦
断面図、第６ａ〜第６ｄ図は減圧吸上鋳造法の行程を順
に示した縦断面図である。
１・・・・湯道部、５・・・・製品成形部、７・・・・
ゲート部、８・・・・小片、１０・・・・原型、１１・
・・・鋳型。
第５図Figures 1 to 5 show an embodiment of the present invention, in which Figure 1 is a vertical cross-sectional view of a prototype, Figure 2 is a vertical cross-sectional view of a mold, and Figure 3 is a vertical cross-sectional view of a mold.
5 to 5 are vertical cross-sectional views sequentially showing the steps of casting the mold 2, and FIGS. 6a to 6d are vertical cross-sectional views sequentially showing the steps of the vacuum suction casting method. 1... runner section, 5... product forming section, 7...
Gate part, 8...Small piece, 10...Prototype, 11...
···template. Figure 5
Claims (1)
くとも一つ以上のゲートに耐熱性の小片を設けたことを
特徴としたロストワックス鋳型のロウ製原型の組立方法
。A method for assembling a wax prototype of a lost wax mold, characterized in that a heat-resistant small piece is provided on at least one gate of a plurality of gates connected to a runner part of the wax prototype.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30131387A JPH01143736A (en) | 1987-11-27 | 1987-11-27 | Method for assembling wax-made pattern in lost wax mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30131387A JPH01143736A (en) | 1987-11-27 | 1987-11-27 | Method for assembling wax-made pattern in lost wax mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01143736A true JPH01143736A (en) | 1989-06-06 |
Family
ID=17895348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30131387A Pending JPH01143736A (en) | 1987-11-27 | 1987-11-27 | Method for assembling wax-made pattern in lost wax mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01143736A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03126254U (en) * | 1990-03-28 | 1991-12-19 |
-
1987
- 1987-11-27 JP JP30131387A patent/JPH01143736A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03126254U (en) * | 1990-03-28 | 1991-12-19 |
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