JPH1177240A - Casting metallic mold - Google Patents
Casting metallic moldInfo
- Publication number
- JPH1177240A JPH1177240A JP23638297A JP23638297A JPH1177240A JP H1177240 A JPH1177240 A JP H1177240A JP 23638297 A JP23638297 A JP 23638297A JP 23638297 A JP23638297 A JP 23638297A JP H1177240 A JPH1177240 A JP H1177240A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- molten metal
- thermal conductivity
- casting
- cast
- 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
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は鋳造金型に関する。The present invention relates to a casting mold.
【０００２】[0002]
【従来の技術】鋳造成形を行う際には、図２に示すよう
な金型を用いるのが一般的である。ここで、４は固定側
金型、５は移動側金型で、両金型４、５の間にキャビテ
ィ３が形成されている。１は第１の湯口、６はランナ
ー、２は第２の湯口である。2. Description of the Related Art It is common to use a mold as shown in FIG. 2 when performing casting. Here, 4 is a fixed mold and 5 is a movable mold, and a cavity 3 is formed between the two molds 4 and 5. 1 is a first gate, 6 is a runner, and 2 is a second gate.
【０００３】成形時には、溶湯たとえば溶融状態にある
合金が、成形機より湯口１、２を通過して、キャビティ
３内に流入してくる。その際、溶湯は、この湯口１、２
およびキャビティ３に流入、充填されていく過程におい
て、常に金型４、５との間で熱交換を行う。このため、
溶湯の温度低下が進行し、液相状態から固相状態へと状
態変化していく。たとえば溶湯がマグネシウム合金であ
る場合は、金型温度２５０℃、製品肉厚１ｍｍのときの
凝固時間は、０．０１秒である。During molding, a molten metal, for example, an alloy in a molten state, flows into the cavity 3 from the molding machine through the gates 1 and 2. At that time, the molten metal is
In the process of flowing into and filling the cavity 3, heat exchange is always performed between the molds 4 and 5. For this reason,
As the temperature of the molten metal decreases, the state changes from a liquid state to a solid state. For example, when the molten metal is a magnesium alloy, the solidification time at a mold temperature of 250 ° C. and a product thickness of 1 mm is 0.01 second.
【０００４】つまり、この凝固時間以内に溶湯をキャビ
ティ３内に充填しないと、充填不良、巣、湯じわなどの
成形不良が発生してしまう。したがって、非常に早い速
度で溶湯を金型キャビティ３の内部に注入する必要があ
る。[0004] That is, if the molten metal is not filled into the cavity 3 within the solidification time, defective molding such as defective filling, nests, and hot lines will occur. Therefore, it is necessary to inject the molten metal into the mold cavity 3 at a very high speed.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、このよ
うに非常な高速で溶湯をキャビティ３の内部に注入する
ことは困難であり、特に基本肉厚の薄い成形品を得よう
とする場合には、既存の成形機を用いてギャビティ３内
に溶湯を十分に充填することは不可能である。また液相
状態では溶湯自体の粘性が低く、そのうえに溶湯の流入
速度が早いため、湯流れが乱流状態になる。したがっ
て、鋳造成形の安定性が確保できにくくなり、鋳造成形
時に鋳バリが発生しやすくなり、また金型破損の恐れが
大きくなるといった問題がある。However, it is difficult to inject the molten metal into the interior of the cavity 3 at such a very high speed. Particularly, when a molded product having a small basic thickness is to be obtained, It is impossible to sufficiently fill the cavity 3 with molten metal using an existing molding machine. Further, in the liquid phase state, the viscosity of the molten metal itself is low, and further, the flowing speed of the molten metal is high. Therefore, there is a problem that it is difficult to secure the stability of the casting, it is easy to generate casting burrs at the time of casting, and the possibility of damage to the mold is increased.
【０００６】本発明は、上記従来の問題点を解決するも
ので、合金などを用いた鋳造成形時において、薄肉の鋳
造成形品の充填性の改善を図るとともに、鋳造成形品に
おける巣、湯じわ、クラックなどの成形不良の発生を防
止することを目的とする。SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems. The present invention aims at improving the filling property of a thin-walled cast product at the time of casting using an alloy or the like. An object of the present invention is to prevent the occurrence of molding defects such as cracks and cracks.
【０００７】[0007]
【課題を解決するための手段】この目的を達成するため
本発明は、溶湯が流れる金型表面部分に、溶湯から金型
への熱伝導を抑えて溶湯の冷却固化速度を遅延させるた
めの、金型の材料よりも熱伝導率の小さい材料が設けら
れているようにしたものである。SUMMARY OF THE INVENTION In order to achieve this object, the present invention provides a method for suppressing the heat conduction from the molten metal to the mold and delaying the cooling and solidifying speed of the molten metal at the surface of the mold through which the molten metal flows. A material having a lower thermal conductivity than the material of the mold is provided.
【０００８】このような構成によると、金型の材料より
も熱伝導率の小さい材料を設けた鋳造金型で成形を行う
ことにより、金型内に流入した溶湯の冷却固化が遅延さ
れ、このため充填可能な距離が伸び、また、巣、湯じ
わ、クラックなどの成形不良が低減される。[0008] According to such a configuration, by performing molding in a casting mold provided with a material having a lower thermal conductivity than the material of the mold, the cooling and solidification of the molten metal flowing into the mold is delayed. Therefore, the filling distance is extended, and molding defects such as nests, hot lines, cracks and the like are reduced.
【０００９】[0009]
【発明の実施の形態】以下、本発明の実施の形態を、図
１にもとづき、図２に示したものと同一の部材には同一
の参照番号を付して、詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIG. 1 and by attaching the same reference numerals to the same members as those shown in FIG.
【００１０】図１に示すように、キャビティ３を形成す
るための固定側金型４の内面と移動側金型５の内面とに
は、それぞれ断熱層７、７が形成されている。この断熱
層７、７は、金型４、５の材料よりも熱伝導率の小さい
材料にて形成されている。As shown in FIG. 1, heat insulating layers 7, 7 are formed on the inner surface of the fixed mold 4 and the inner surface of the movable mold 5 for forming the cavity 3, respectively. The heat insulating layers 7, 7 are formed of a material having a lower thermal conductivity than the material of the molds 4, 5.
【００１１】すなわち、たとえば金型４、５が鋼材の場
合には、断熱層７、７は、その熱伝導率が０．０５ｃａ
ｌ／ｃｍ・ｓｅｃ・℃以下であることが好ましい。この
場合に、熱伝導率が０．０５ｃａｌ／ｃｍ・ｓｅｃ・℃
を越えると、溶湯の冷却固化を十分に遅らせることが困
難になる。たとえば、上述のように金型４、５が鋼材
で、また溶湯がマグネシウム合金である場合には、断熱
層７、７は、溶射材やセラミックス複合無機電解メッキ
材やその他の材料によって形成されているのが好適であ
る。That is, for example, when the molds 4 and 5 are made of steel, the heat insulating layers 7 and 7 have a thermal conductivity of 0.05
It is preferably 1 / cm · sec · ° C. or less. In this case, the thermal conductivity is 0.05 cal / cm · sec · ° C.
If the temperature exceeds, it is difficult to sufficiently delay the cooling and solidification of the molten metal. For example, when the molds 4 and 5 are steel materials and the molten metal is a magnesium alloy as described above, the heat insulating layers 7 and 7 are formed of a thermal spray material, a ceramic composite inorganic electrolytic plating material, or another material. Is preferred.
【００１２】溶湯の冷却固化を遅らせる目的で設けられ
る断熱層７、７は、その目的に応じて、その厚さが１μ
ｍ〜５ｍｍの範囲であるのが好適である。そして断熱層
７、７は、上記の範囲における所望の厚さとするため
に、単層、あるいは複数の層で形成された複数層のいず
れかによって形成される。また断熱層７、７は、適宜の
手段によって金型４、５の内面に固着される。The heat insulating layers 7, 7 provided for the purpose of delaying the cooling and solidification of the molten metal have a thickness of 1 μm depending on the purpose.
Preferably, it is in the range of m to 5 mm. The heat insulating layers 7, 7 are formed of either a single layer or a plurality of layers formed to have a desired thickness in the above range. The heat insulating layers 7, 7 are fixed to the inner surfaces of the molds 4, 5 by appropriate means.
【００１３】[0013]
【実施例】以下本発明の一実施例について説明する。す
なわち、下記の仕様で鋳造成形品を得た。An embodiment of the present invention will be described below. That is, a cast product was obtained with the following specifications.
【００１４】 成形品 ：２８インチサイズのＴＶキャビネット 成形品サイズ ：約６９５ｍｍ×約４７２ｍｍ×約１６３ｍｍ 一般肉厚 ：２．０ｍｍ 合金材料 ：マグネシウム合金（ＡＺ９１） 金型材料 ：ＳＫＤ６１ 断熱層材料 ：セラミックス 溶射 断熱層熱伝導率 ：０．００４ｃａｌ／ｃｍ・ｓｅｃ・℃ 断熱層厚さ ：２００μｍ 上記成形品の場合、使用した成形機のもつ充填能力と成
形品重量とから算出される理論所要肉厚は２．０ｍｍで
あるが、本発明の断熱層を備えた鋳造成形金型を用いて
既存の成形機にて鋳造成形したところ、充填性が改善さ
れて肉厚１．２ｍｍの薄肉成形品を得ることができた。Molded product: TV cabinet of 28 inch size Molded product size: about 695 mm × about 472 mm × about 163 mm General thickness: 2.0 mm Alloy material: magnesium alloy (AZ91) Mold material: SKD61 Heat insulation layer material: ceramics thermal spray Insulation layer thermal conductivity: 0.004 cal / cm · sec · ° C. Insulation layer thickness: 200 μm In the case of the above molded product, the theoretical required wall thickness calculated from the filling capacity of the molding machine used and the molded product weight is 2 It is 0.0 mm, but when it is cast-formed with an existing molding machine using a casting mold provided with a heat insulating layer of the present invention, a fillability is improved and a thin molded product having a thickness of 1.2 mm is obtained. Was completed.
【００１５】[0015]
【発明の効果】以上のように本発明によると、溶湯が流
れる金型表面部分に、金型の材料よりも熱伝導率の小さ
い材料を設けたことにより、金型内に流入した溶湯の冷
却固化を遅延でき、このため充填可能な距離を伸ばすこ
とができ、また、巣、湯じわ、クラックなどの成形不良
を低減できる。このため、既存の成形機を用いて薄肉成
形品の鋳造を実現できるだけでなく、鋳造成形の安定性
を確保でき、鋳造成形時の鋳バリを低減できて成形品の
２次加工の削減を図ることができ、また金型破損の恐れ
を少なくすることができる。As described above, according to the present invention, a material having a lower thermal conductivity than the material of the mold is provided on the surface of the mold through which the molten metal flows, thereby cooling the molten metal flowing into the mold. The solidification can be delayed, so that the fillable distance can be increased, and molding defects such as nests, hot lines, cracks, etc. can be reduced. For this reason, casting of a thin-walled molded product can be realized by using an existing molding machine, as well as stability of the cast molding can be secured, casting burrs at the time of casting can be reduced, and secondary processing of the molded product can be reduced. And the risk of mold breakage can be reduced.
【図１】本発明の実施の形態の鋳造金型の断面図であ
る。FIG. 1 is a sectional view of a casting mold according to an embodiment of the present invention.
【図２】従来の鋳造金型の断面図である。FIG. 2 is a sectional view of a conventional casting mold.
３ キャビティ ４ 固定側金型 ５ 可動側金型 ７ 断熱層 3 Cavity 4 Fixed mold 5 Movable mold 7 Heat insulation layer
Claims (4)
金型への熱伝導を抑えて溶湯の冷却固化速度を遅延させ
るための、金型の材料よりも熱伝導率の小さい材料が設
けられていることを特徴とする鋳造金型。1. A material having a lower thermal conductivity than a material of a mold for suppressing heat conduction from the melt to the mold and delaying a cooling and solidifying rate of the melt is provided on a surface of the mold in which the melt flows. A casting mold characterized by being made.
が単層または複数層で設けられていることを特徴とする
請求項１記載の鋳造金型。2. The casting mold according to claim 1, wherein a material having a lower thermal conductivity than the material of the mold is provided in a single layer or a plurality of layers.
に、金型の材料よりも熱伝導率の小さい材料の熱伝導率
が０．０５ｃａｌ／ｃｍ・ｓｅｃ・℃以下であることを
特徴とする請求項１または２記載の鋳造金型。3. The method according to claim 1, wherein the mold is formed of a steel material, and a material having a lower thermal conductivity than the material of the mold has a thermal conductivity of 0.05 cal / cm · sec · ° C. or less. The casting mold according to claim 1 or 2, wherein
型の材料よりも熱伝導率の小さい材料が溶射材またはセ
ラミックス複合無機電解メッキ材であることを特徴とす
る請求項３記載の鋳造金型。4. The casting mold according to claim 3, wherein the molten metal is a magnesium alloy melt, and the material having a lower thermal conductivity than the material of the mold is a thermal spray material or a ceramic composite inorganic electrolytic plating material. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23638297A JPH1177240A (en) | 1997-09-02 | 1997-09-02 | Casting metallic mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23638297A JPH1177240A (en) | 1997-09-02 | 1997-09-02 | Casting metallic mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1177240A true JPH1177240A (en) | 1999-03-23 |
Family
ID=16999965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23638297A Pending JPH1177240A (en) | 1997-09-02 | 1997-09-02 | Casting metallic mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1177240A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000343199A (en) * | 1999-06-08 | 2000-12-12 | Mitsui Mining & Smelting Co Ltd | Die scheme, die cast casting, and die cast product |
| JP2007118071A (en) * | 2005-10-31 | 2007-05-17 | Honda Motor Co Ltd | Method for producing cast product and die |
| JP2015512788A (en) * | 2012-04-12 | 2015-04-30 | レル， インコーポレイテッド | Insulation for casting articles |
-
1997
- 1997-09-02 JP JP23638297A patent/JPH1177240A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000343199A (en) * | 1999-06-08 | 2000-12-12 | Mitsui Mining & Smelting Co Ltd | Die scheme, die cast casting, and die cast product |
| KR100412071B1 (en) * | 1999-06-08 | 2003-12-31 | 미츠이 긴조쿠 고교 가부시키가이샤 | Method for molding, method for die casting and die cast products |
| JP2007118071A (en) * | 2005-10-31 | 2007-05-17 | Honda Motor Co Ltd | Method for producing cast product and die |
| JP4579131B2 (en) * | 2005-10-31 | 2010-11-10 | 本田技研工業株式会社 | Manufacturing method and mold for body frame for motorcycle |
| JP2015512788A (en) * | 2012-04-12 | 2015-04-30 | レル， インコーポレイテッド | Insulation for casting articles |
| JP2015512789A (en) * | 2012-04-12 | 2015-04-30 | レル， インコーポレイテッド | Insulating spray for casting articles |
| US10179364B2 (en) | 2012-04-12 | 2019-01-15 | Rel, Inc. | Thermal isolation for casting articles |
| US10434568B2 (en) | 2012-04-12 | 2019-10-08 | Loukus Technologies, Inc. | Thermal isolation spray for casting articles |
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