JP3029781B2 - Vacuum die casting method - Google Patents
Vacuum die casting methodInfo
- Publication number
- JP3029781B2 JP3029781B2 JP7053663A JP5366395A JP3029781B2 JP 3029781 B2 JP3029781 B2 JP 3029781B2 JP 7053663 A JP7053663 A JP 7053663A JP 5366395 A JP5366395 A JP 5366395A JP 3029781 B2 JP3029781 B2 JP 3029781B2
- Authority
- JP
- Japan
- Prior art keywords
- cavity
- mold
- release agent
- powder release
- die casting
- 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.)
- Expired - Fee Related
Links
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Mold Materials And Core Materials (AREA)
Description
【0001】[0001]
【産業上の利用分野】この発明はアルミ又はアルミ合金
に用いられるダイカスト鋳造方法に関し、特に粉体離型
剤を用いた減圧ダイカスト鋳造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die casting method used for aluminum or an aluminum alloy, and more particularly to a reduced pressure die casting method using a powder release agent.
【0002】[0002]
【従来の技術】ダイカスト鋳造で用いる離型剤としては
従来より鉱物油、油脂類、ワックス、合成油等を界面活
性剤を用いて水に乳化させた水溶性離型剤が用いられて
いた。ところが近年、窒化ホウ素、雲母、金属酸化物、
窒化ケイ素等の無機固体潤滑剤と金属石けんや高分子化
合物等の有機化合物とからなる粉体離型剤を用いる技術
が開発されている。例えば特公平6−9730号公報に
は、各種のダイカスト鋳造用の粉体離型剤が開示されて
おり、また日本ダイカスト会議論文集JD92−03p
p23−26には、高分子化合物の重量%が5、10〜
20、及び50%の粉体離型剤が開示されている。また
粉体離型剤を用いたダイカスト鋳造における金型表面温
度については、前記論文集JD92−05pp37−4
1に、200℃を越えないことが好ましい旨開示されて
いる。更に前記論文集JD94−33pp283−29
2には、粉体離型剤を使用し、射出圧力17.5MPa
にて鋳造することが開示されている。2. Description of the Related Art As a release agent used in die casting, a water-soluble release agent obtained by emulsifying mineral oil, fat, wax, synthetic oil or the like in water using a surfactant has been used. However, in recent years, boron nitride, mica, metal oxides,
A technique using a powder release agent comprising an inorganic solid lubricant such as silicon nitride and an organic compound such as metal soap or a polymer compound has been developed. For example, Japanese Patent Publication No. 6-9730 discloses various types of powder release agents for die casting, and Japanese Die Casting Conference JD92-03p.
In p23-26, the weight percentage of the polymer compound is 5, 10 to 10.
20 and 50% powder release agents are disclosed. Regarding the die surface temperature in die casting using a powder release agent, the above-mentioned JD92-05pp37-4.
No. 1 discloses that it is preferable not to exceed 200 ° C. Furthermore, the above-mentioned collection of articles JD94-33pp283-29
For 2, a powder release agent was used and the injection pressure was 17.5 MPa.
Is disclosed.
【0003】[0003]
【発明が解決しようとする課題】しかるに上記従来の技
術では、粉体離型剤の高分子化合物の含有率や、キャビ
ティー表面での金型温度、あるいは金属溶湯の射出圧力
について、それぞれ個別の鋳造条件を教えるのみであっ
て、全体的にこれらの条件をいかに設定するのが最適化
について考えるところがない。したがって本発明は、ア
ルミまたはアルミ合金に用いられる減圧ダイカスト鋳造
方法において良好な鋳造品を得ることができる鋳造方法
を提供することを目的とする。However, in the above-mentioned prior art, the content of the polymer compound in the powder release agent, the mold temperature on the cavity surface, or the injection pressure of the molten metal are individually determined. It only teaches casting conditions, and there is no way to think about optimization as to how to set these conditions as a whole. Therefore, an object of the present invention is to provide a casting method capable of obtaining a good casting in a reduced-pressure die casting method used for aluminum or an aluminum alloy.
【0004】[0004]
【課題を解決するための手段】本発明は上記目的を達成
するためになされたものであり、すなわち、固定金型と
可動金型とによってキャビティーを形成し、該キャビテ
ィーを減圧し、前記減圧したキャビティーの金型表面に
無機固体潤滑剤と有機化合物とからなる粉体離型剤を供
給し前記金型表面に塗布し、更に前記キャビティーにア
ルミまたはアルミニウム合金の溶湯を射出して凝固させ
る減圧ダイカスト鋳造方法において、粉体離型剤の有機
化合物の含有率が0.1%以上50%以下であり、前記
キャビティーの表面での金型温度が270℃以下であ
り、且つ前記金属溶湯の射出圧力が20MPa以下であ
ることを特徴とする減圧ダイカスト鋳造方法である。SUMMARY OF THE INVENTION The present invention has been made to achieve the above object. That is, a cavity is formed by a fixed mold and a movable mold, and the pressure in the cavity is reduced. Supplying a powder release agent comprising an inorganic solid lubricant and an organic compound to the mold surface of the depressurized cavity and applying it to the mold surface, and further injecting a molten aluminum or aluminum alloy into the cavity. In the reduced pressure die casting method for solidifying, the content of the organic compound of the powder release agent is 0.1% or more and 50% or less, the mold temperature on the surface of the cavity is 270 ° C or less, and A reduced pressure die casting method, wherein the injection pressure of the molten metal is 20 MPa or less.
【0005】[0005]
【作用】本発明の各製造条件の限定理由は、以下の通り
である。粉体離型剤は、窒化ホウ素、雲母、金属酸化
物、窒化珪素等の無機固体潤滑剤と金属石鹸(カルボン
酸骨格にナトリウム、カルシウム、バリウム、リチウ
ム、カリウム、マグネシウム、又は亜鉛)、高分子化合
物(ポリエチレン、ポリプロピレン、エポキシ樹脂、ア
ルキッド樹脂、又はポリスチレン)からなる有機化合物
とを配合したものである。この配合比率は、有機化合物
の含有割合を50%以下とする。これは、粉体離型剤が
金型表面に塗布された後に、アルミニウム等の金属溶湯
と接触する時に溶湯の熱で有機化合物が反応し燃え出し
ガス化して、溶湯中に混入し、製品時にはブローホール
となるためである。また粉体離型剤中に有機化合物が含
まれない場合には、無機固体潤滑剤を金型表面に付着さ
せることが出来ないため、0.1%以上は含有する必要
がある。上記の有機化合物以外の無機固体潤滑剤は溶湯
と接触しても反応せず、金型表面部に存在し、溶湯と金
型間の熱伝導度を低下させ、断熱剤として働くために溶
湯の湯温の低下を防止する。したがって、キャビティ内
での溶湯の温度が高温に保たれるので、従来よりも薄肉
部まで溶湯がゆきわたることが出来るため、従来のダイ
カスト法に比べて薄肉の製品を得ることが出来る。The reasons for limiting the manufacturing conditions of the present invention are as follows. Powder release agents include inorganic solid lubricants such as boron nitride, mica, metal oxides, silicon nitride, and metal soaps (sodium, calcium, barium, lithium, potassium, magnesium, or zinc in the carboxylic acid skeleton), polymers Compounded with an organic compound comprising a compound (polyethylene, polypropylene, epoxy resin, alkyd resin, or polystyrene). In this mixing ratio, the content ratio of the organic compound is set to 50% or less. This is because after the powder release agent is applied to the mold surface, the organic compound reacts with the heat of the molten metal when it comes into contact with the molten metal such as aluminum, burns out and gasifies, and mixes into the molten metal. This is because it becomes a blowhole. Further, when an organic compound is not contained in the powder release agent, the inorganic solid lubricant cannot be adhered to the mold surface. Therefore, it is necessary to contain 0.1% or more. The inorganic solid lubricant other than the above-mentioned organic compound does not react even when it comes into contact with the molten metal, exists on the surface of the mold, reduces the thermal conductivity between the molten metal and the mold, and acts as a heat insulating agent. Prevents a drop in hot water temperature. Therefore, since the temperature of the molten metal in the cavity is maintained at a high temperature, the molten metal can spread to a thinner portion than in the conventional case, so that a thinner product can be obtained as compared with the conventional die casting method.
【0006】また、湯温の低下が少ないということは、
従来よりも低温で射出が可能となるため、使用する金型
材が低級材ですみ、従来の高級材を金型に用いた場合に
は使用可能時間が延びる。更に金型表面温度は、前記の
粉体離型剤中の有機化合物が溶けることから270℃以
下とする。また、キャビティー内を減圧することで溶湯
が充填しやすく、上記したように粉体離型剤を用いるこ
とでも湯流れが良くなるため射出圧力は20MPa以下
で良いので、鋳造機自体の射出圧力が従来に比べて低く
てすみ、鋳造機自体も小型化が可能となる。[0006] Further, the fact that the decrease in the temperature of the hot water is small means that
Since injection can be performed at a lower temperature than in the past, the mold material to be used can be a low-grade material, and when a conventional high-grade material is used for the mold, the usable time is extended. Further, the mold surface temperature is set to 270 ° C. or lower because the organic compound in the powder release agent is dissolved. Also, by reducing the pressure in the cavity, the molten metal can be easily filled, and the flow of the molten metal can be improved by using the powder release agent as described above. Therefore, the injection pressure may be 20 MPa or less. However, the casting machine itself can be reduced in size, and the casting machine itself can be downsized.
【0007】[0007]
【実施例】本発明を図面によって説明する。図1は本発
明方法を適用するための鋳造装置の一例を示し、この鋳
造装置は固定金型1と可動金型2とを有し、両金型1,
2によってキャビティー3が形成されている。固定金型
1にはスリーブ4が接続されており、スリーブ4内には
図示しない押圧装置によって摺動するプランジャーチッ
プ5が内装されている。スリーブ4の下面には、アルミ
ニウム合金の溶湯を供給する電磁ポンプ6が接続されて
おり、スリーブ4の上面には、静電ノズル7が取り付け
られている。タンク8には粉体離型剤9が充填されてお
り、タンク8内の粉体離型剤9は流動エアー10によっ
て流動化されている。粉体離型剤9としては、タルク、
窒化ホウ素、雲母、黒鉛無機固体潤滑剤80〜90%と
高分子化合物10〜20%とからなる。BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 shows an example of a casting apparatus to which the method of the present invention is applied. This casting apparatus has a fixed mold 1 and a movable mold 2,
2 forms a cavity 3. A sleeve 4 is connected to the fixed mold 1, and a plunger tip 5 that is slid by a pressing device (not shown) is provided inside the sleeve 4. An electromagnetic pump 6 for supplying molten aluminum alloy is connected to the lower surface of the sleeve 4, and an electrostatic nozzle 7 is attached to the upper surface of the sleeve 4. The tank 8 is filled with a powder release agent 9, and the powder release agent 9 in the tank 8 is fluidized by flowing air 10. As the powder release agent 9, talc,
It is composed of 80 to 90% of boron nitride, mica and graphite inorganic solid lubricant and 10 to 20% of a high molecular compound.
【0008】タンク8には定流量吐出器11が接続され
ており、この定流量吐出器11に吐出エアー12を吐出
することにより、粉体離型剤9を静電ノズル7よりスリ
ーブ4を通じてキャビティー3に吐出するように構成さ
れている。静電ノズル7は高電圧発生器13の負極に接
続されており、高電圧発生器13の正極は固定金型1に
接続されており、こうして静電ノズル7より吐出された
粉体離型剤9は、静電塗装法によってキャビティー3の
表面に塗布される。またキャビティー3は真空遮断弁1
4を介して、真空ポンプ16によって減圧される真空タ
ンク15に接続されている。A constant flow rate discharger 11 is connected to the tank 8, and discharge air 12 is discharged to the constant flow rate discharger 11 so that the powder release agent 9 is transferred from the electrostatic nozzle 7 through the sleeve 4 to the cabinet 8. It is configured to discharge to the tee 3. The electrostatic nozzle 7 is connected to the negative electrode of the high voltage generator 13, and the positive electrode of the high voltage generator 13 is connected to the fixed mold 1, and thus the powder release agent discharged from the electrostatic nozzle 7 9 is applied to the surface of the cavity 3 by an electrostatic coating method. The cavity 3 is a vacuum shut-off valve 1
4 is connected to a vacuum tank 15, which is depressurized by a vacuum pump 16.
【0009】次に上記鋳造装置を用いたダイカスト鋳造
方法について説明すると、先ず可動金型2を前進し、固
定金型1と密着させ型締めをしキャビティー3を形成し
た後にプランジャーチップ5を若干前進させて、図1に
示すように電磁ポンプ6からの給湯口を塞ぎ、真空遮断
弁14を開いてキャビティー3内を真空タンク15によ
り真空吸引する。キャビティー3内の真空度が一定程度
高まった後に、真空遮断弁14を閉じ、定流量吐出器1
1を動作させて、スリーブ4を通じて粉体離型剤9を吐
出ガス12によりキャビティー3に吐出する。これによ
り、スリーブ4内面とキャビティー3の金型面に粉体離
型剤が塗布される。次いでプランジャーチップ5を後退
させて電磁ポンプ6によりスリーブ4内にアルミニウム
合金の溶湯を注湯し、プランジャーチップ5を前進させ
てスリーブ4内の溶湯をキャビティー3内に射出する。
このとき、金型の表面温度が270℃以下となるよう
に、必要により金型1,2を局部的に冷却する。また射
出圧力は20MPa以下とする。キャビティー3に注湯
されたアルミニウム合金の溶湯が凝固した後に、可動金
型2を後退させて鋳造品を取出して1回の鋳造サイクル
を終了する。Next, a die casting method using the above-described casting apparatus will be described. First, the movable mold 2 is advanced, and the movable mold 2 is brought into close contact with the fixed mold 1 to form a cavity 3. By slightly moving forward, the hot water supply port from the electromagnetic pump 6 is closed as shown in FIG. 1, the vacuum shut-off valve 14 is opened, and the inside of the cavity 3 is evacuated by the vacuum tank 15. After the degree of vacuum in the cavity 3 has increased to a certain degree, the vacuum shutoff valve 14 is closed and the constant flow rate discharger 1
By operating 1, the powder release agent 9 is discharged into the cavity 3 by the discharge gas 12 through the sleeve 4. Thus, the powder release agent is applied to the inner surface of the sleeve 4 and the mold surface of the cavity 3. Next, the plunger tip 5 is retracted, a molten aluminum alloy is poured into the sleeve 4 by the electromagnetic pump 6, and the plunger tip 5 is advanced to inject the molten metal in the sleeve 4 into the cavity 3.
At this time, the molds 1 and 2 are locally cooled as necessary so that the surface temperature of the molds becomes 270 ° C. or less. The injection pressure is set to 20 MPa or less. After the melt of the aluminum alloy poured into the cavity 3 is solidified, the movable mold 2 is retracted to take out a casting, and one casting cycle is completed.
【0010】以上のように本実施例では、高分子化合物
の含有率が50%以下の粉体離型剤を用いているから、
50%を越える無機固体潤滑剤が燃焼せずにキャビティ
ー3の表面に付着し、これが断熱材として作用して湯温
の低下を防止する。したがってより低温の溶湯を注湯す
ることができるから、耐高温材が不要となり、同一の金
型1,2でのショット数の増加を図ることができる。ま
たキャビティーの表面での金型温度が270℃以下であ
るから、型寿命が伸び、金属組織の不良が減少する。更
に溶湯の射出圧力が20MPa以下であるから、鋳造装
置の小型化を図ることができる。As described above, in this embodiment, since the powder release agent having a content of the high molecular compound of 50% or less is used,
More than 50% of the inorganic solid lubricant adheres to the surface of the cavity 3 without burning, and acts as a heat insulating material to prevent the temperature of the hot water from lowering. Therefore, since a lower-temperature molten metal can be poured, a high-temperature resistant material is not required, and the number of shots in the same molds 1 and 2 can be increased. Further, since the mold temperature on the surface of the cavity is 270 ° C. or less, the life of the mold is extended, and the defects of the metal structure are reduced. Further, since the injection pressure of the molten metal is 20 MPa or less, the size of the casting apparatus can be reduced.
【0011】[0011]
【発明の効果】以上のように本発明方法では、減圧ダイ
カスト鋳造方法に有機化合物の含有率を50%以下の粉
体離型剤を用い、キャビティーの表面での金型温度を2
70℃以下とし、且つ金型溶湯の射出圧力を20MPa
以下としたから、小型で安価な鋳造装置を用いて、品質
の優れたダイカスト品を鋳造することができる。As described above, according to the method of the present invention, the depressurizing die-casting method uses a powder release agent having an organic compound content of 50% or less and reduces the mold temperature on the cavity surface to 2%.
70 ° C or less, and injection pressure of the molten metal mold is 20 MPa
From the following, it is possible to cast a high-quality die-cast product using a small and inexpensive casting apparatus.
【図1】本発明方法を適用する鋳造装置の一例を示す系
統図FIG. 1 is a system diagram showing an example of a casting apparatus to which the method of the present invention is applied.
1…固定金型 2…可動金型 3
…キャビティー 4…スリーブ 5…プランジャーチップ 6
…電磁ポンプ 7…静電ノズル 8…タンク 9
…粉体離型剤 10…流動エアー 11…定流量吐出器 1
2…吐出エアー 13…高電圧発生器 14…真空遮断弁 1
5…真空タンク 16…真空ポンプ1 ... fixed mold 2 ... movable mold 3
… Cavity 4… Sleeve 5… Plunger tip 6
... Electromagnetic pump 7 ... Electrostatic nozzle 8 ... Tank 9
... powder release agent 10 ... flowing air 11 ... constant flow rate discharger 1
2 ... Discharge air 13 ... High voltage generator 14 ... Vacuum shut-off valve 1
5 ... Vacuum tank 16 ... Vacuum pump
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平3−243242(JP,A) 特開 平6−322493(JP,A) 特開 昭63−220962(JP,A) 特開 昭49−1427(JP,A) (58)調査した分野(Int.Cl.7,DB名) B22D 17/14 B22D 17/20 B22D 17/22 B22D 17/32 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-243242 (JP, A) JP-A-6-322493 (JP, A) JP-A-63-220962 (JP, A) JP-A-49-49 1427 (JP, A) (58) Field surveyed (Int. Cl. 7 , DB name) B22D 17/14 B22D 17/20 B22D 17/22 B22D 17/32
Claims (1)
ィーを形成し、該キャビティーを減圧し、前記減圧した
キャビティーの金型表面に無機固体潤滑剤と有機化合物
とからなる粉体離型剤を供給し前記金型表面に塗布し、
更に前記キャビティーにアルミまたはアルミニウム合金
の溶湯を射出して凝固させる減圧ダイカスト鋳造方法に
おいて、 前記粉体離型剤の有機化合物の含有率が0.1%以上5
0%以下であり、前記キャビティーの表面での金型温度
が270℃以下であり、且つ前記金属溶湯の射出圧力が
20MPa以下であることを特徴とする減圧ダイカスト
鋳造方法。1. A forming a cavity by a fixed mold and a movable mold and vacuum the cavity, an inorganic solid lubricant and an organic compound on the mold surface of the vacuum was <br/> cavity A powder release agent is supplied and applied to the mold surface,
In addition, aluminum or aluminum alloy is placed in the cavity.
In a vacuum die casting method for injecting and solidifying a molten metal, the content of the organic compound in the powder release agent is 0.1% or more.
Or less 0%, the mold temperature at the surface of the cavity is at 270 ° C. or less, and vacuum die casting method, wherein the injection pressure of the molten metal is not more than 20 MPa.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7053663A JP3029781B2 (en) | 1995-02-17 | 1995-02-17 | Vacuum die casting method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7053663A JP3029781B2 (en) | 1995-02-17 | 1995-02-17 | Vacuum die casting method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH08215821A JPH08215821A (en) | 1996-08-27 |
JP3029781B2 true JP3029781B2 (en) | 2000-04-04 |
Family
ID=12949100
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7053663A Expired - Fee Related JP3029781B2 (en) | 1995-02-17 | 1995-02-17 | Vacuum die casting method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3029781B2 (en) |
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---|---|---|---|---|
DE19753660C2 (en) * | 1997-12-03 | 2001-01-25 | Wagner Internat Ag Altstaetten | Method and device for applying a release agent to an injection mold |
DE10025489C2 (en) * | 2000-05-23 | 2002-08-01 | Daimler Chrysler Ag | Device and method for producing metal-ceramic composites |
CN108994272A (en) * | 2018-09-13 | 2018-12-14 | 台山市国峰耐磨金属科技有限公司 | A kind of pressure casting method of die casting |
CN109732038B (en) * | 2019-03-04 | 2021-04-06 | 宁波辉宏新材料有限公司 | Die-casting release agent and preparation method thereof |
-
1995
- 1995-02-17 JP JP7053663A patent/JP3029781B2/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2014103898A (en) * | 2012-11-28 | 2014-06-09 | Seiwa:Kk | Greenhouse curtain drawing member and opening/closing mechanism for greenhouse curtain |
KR101890490B1 (en) | 2016-12-13 | 2018-08-21 | 김종화 | Ventilation equipment of Plant factory type Greenhouse |
Also Published As
Publication number | Publication date |
---|---|
JPH08215821A (en) | 1996-08-27 |
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