JPH0775851A - Metal mold casting method - Google Patents
Metal mold casting methodInfo
- Publication number
- JPH0775851A JPH0775851A JP22093393A JP22093393A JPH0775851A JP H0775851 A JPH0775851 A JP H0775851A JP 22093393 A JP22093393 A JP 22093393A JP 22093393 A JP22093393 A JP 22093393A JP H0775851 A JPH0775851 A JP H0775851A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- insert
- cavity
- die
- shrinkage
- 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.)
- Withdrawn
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- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、キャビティの一部に熱
伝導率の低い部材を臨ませて鋳造欠陥を防止するように
した金型鋳造法の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a die casting method in which a member having a low thermal conductivity is exposed in a part of a cavity to prevent a casting defect.
【０００２】[0002]
【従来の技術】従来、砂型鋳造に較べて冷却速度の速い
金型鋳造においては、厚肉部と薄肉部の凝固速度の差が
大きくなってヒケ等の鋳造欠陥を生じやすく、例えば図
６に示すような金型５１において、湯口から湯道５３を
通してキャビティ５４に注湯するような場合、特に最終
段階で凝固する厚肉部分５４ａの中心部Ｃのような場所
ではヒケ等の不具合が生じるため、例えば実開昭５８―
２３２４６号のように、キャビティの一部に熱伝導性の
低い部材を臨ませて、厚肉部、薄肉部の凝固速度を均一
にするようにした技術が知られている。すなわち、この
技術は銅或いは銅合金製の金型において、厚肉部を熱伝
導性の高い金型本体に臨ませ、薄肉部を、鉄、鋳鉄、ス
テンレス等の金型本体より熱伝導性の低い入子に臨ませ
て、厚肉部と薄肉部の凝固速度を均一化し、ヒケ等の成
形不良を抑制するようにしている。2. Description of the Related Art Conventionally, in die casting, which has a higher cooling rate than sand casting, the difference in solidification rate between the thick portion and the thin portion is large, and casting defects such as sink marks are likely to occur. In the mold 51 as shown, when pouring from the sprue into the cavity 54 through the runner 53, a defect such as a sink mark may occur especially in a place such as the central portion C of the thick portion 54a that solidifies at the final stage. , For example
As in No. 23246, there is known a technique in which a member having a low heat conductivity is made to face a part of the cavity to make the solidification rate of the thick portion and the thin portion uniform. That is, in this technique, in a mold made of copper or a copper alloy, the thick-walled part is made to face the mold body having high thermal conductivity, and the thin-walled part is made of iron, cast iron, stainless steel, etc. By facing the low nesting, the solidification rate of the thick part and the thin part is made uniform, and molding defects such as sink marks are suppressed.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記技
術においては溶湯が直接接触する部分に鉄、鋳鉄、ステ
ンレス等の金属製入子を使用しており、この入子は冷却
を伴わず且つ金属であるが故に大きな膨張・収縮差が生
じて熱変形を伴いやすく、金型本体との間の隙間が大き
くなってバリ差しが生じたり、又は製品精度、形状に悪
影響を与えたりする等の問題があった。また、金属製入
子の場合では熱疲労によって寿命が短いという問題もあ
った。更に鋳造品が複雑形状の場合、入子の製造に手間
がかかり、コストアップの要因にもなっていた。However, in the above technique, a metal insert made of iron, cast iron, stainless steel or the like is used in a portion where the molten metal comes into direct contact, and the insert is not cooled and is made of metal. Therefore, there is a large difference between expansion and contraction, which is likely to cause thermal deformation, and the gap between the main body of the mold becomes large, causing burr insertion, or adversely affecting product accuracy and shape. there were. Further, in the case of a metal insert, there is a problem that the life is short due to thermal fatigue. Further, when the cast product has a complicated shape, it takes time and labor to manufacture the insert, which causes a cost increase.
【０００４】[0004]
【課題を解決するための手段】かかる課題を解決するた
め、本発明は金型のキャビティの一部に金型素材より熱
伝導性の低い部材を臨ませて鋳造するようにした金型鋳
造法において、前記熱伝導性の低い部材をセラミックス
又は砂入子とした。In order to solve the above problems, the present invention is a die casting method in which a member having a lower thermal conductivity than a die material is made to face a part of a cavity of a die for casting. In above, the member having low thermal conductivity is ceramics or sand nest.
【０００５】[0005]
【作用】キャビティの一部にセラミックス又は砂入子の
非金属製の熱伝導性の低い入子を臨ませることで、最終
凝固時間が長くなり押湯の効果が充分得られるととも
に、入子の膨張・収縮差に起因する隙間へのバリ差し、
製品精度不良、形状不良等が防止される。また、かかる
セラミックス又は砂入子の場合は、金属に較べて複雑形
状であっても比較的簡単且つ安価に容易に製作すること
が出来る。[Function] By allowing a non-metal insert made of ceramics or sand inserts and having a low heat conductivity to face a part of the cavity, the final solidification time becomes longer and the effect of the feeder is sufficiently obtained, and the insert expands.・ Burr insertion into the gap due to the difference in shrinkage,
Product accuracy defects, shape defects, etc. are prevented. Further, in the case of such ceramics or sand inserts, it can be relatively easily and inexpensively manufactured even if it has a complicated shape as compared with metal.
【０００６】[0006]
【実施例】本発明の金型鋳造法の実施例について添付し
た図面に基づき説明する。図１は本発明に係る金型の構
成例図、図２は同一部の斜視図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the die casting method of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a structural example of a mold according to the present invention, and FIG. 2 is a perspective view of the same portion.
【０００７】図１に示すように、縦型鋳造金型として例
えば銅又は銅合金製の金型１は、型合せ面２に彫り込ま
れた垂直湯道３と、この垂直湯道３の下方から左右に分
離する水平湯道４、４と、各水平湯道４、４に連なるキ
ャビティ５、５と、このキャビティ５、５の上部に連な
る押湯部６、６を備え、前記垂直湯道３の上端には溶湯
を注湯する湯口７が形成されている。As shown in FIG. 1, a mold 1 made of, for example, copper or a copper alloy as a vertical casting mold has a vertical runner 3 engraved on a mold matching surface 2 and from below the vertical runner 3. The vertical runner 3 is provided with horizontal runners 4 and 4 that are separated into left and right, cavities 5 and 5 that are connected to the horizontal runners 4 and 4, and feeders 6 and 6 that are connected to the upper portions of the cavities 5 and 5. A gate 7 for pouring the molten metal is formed at the upper end of the.
【０００８】そして、この金型１の型合せ面２に向け
て、ほぼ対称形のキャビティ等を彫り込んだ不図示の他
の一対の金型が型締め、型開き自在とされている。A pair of other dies (not shown) having substantially symmetrical cavities are engraved toward the die-matching surface 2 of the die 1 so that the die can be opened.
【０００９】このような金型構造の場合、型締め状態で
湯口７から溶湯を注湯して湯道３、４を介してキャビテ
ィ５、押湯部６内に溶湯を充填すれば、キャビティ５内
の溶湯の表面は冷やされて外側から凝固を始める。In the case of such a die structure, when the molten metal is poured from the spout 7 in the mold clamped state and the molten metal is filled in the cavity 5 and the feeder portion 6 through the runners 3 and 4, the cavity 5 The surface of the molten metal inside is cooled and begins to solidify from the outside.
【００１０】そして、例えばキャビティ５の上方の厚肉
部分５ａの中心部が凝固する際は、凝固収縮分は上方の
押湯部６からの溶湯が補給されるが、下方の厚肉部分５
ｂの中心部が凝固する際は、凝固収縮分の溶湯は周囲か
ら補給されず、ヒケ等が生じやすくなる。Then, for example, when the central portion of the thick portion 5a above the cavity 5 is solidified, the solidification shrinkage is replenished with the molten metal from the feeder portion 6 above, but the thick portion 5 below
When the center portion of b is solidified, the melt for the solidification shrinkage is not replenished from the surroundings, and sink marks or the like are likely to occur.
【００１１】そこで、本案ではこのヒケ等の生じやすい
下方の厚肉部分５ｂの金型１の一部を、セラミックス或
いは砂型のような金属より熱伝導性の低い入子型８で置
換するようにしており、実施例の場合レジン砂を粘結し
た崩壊性のあるシェル型としている。Therefore, in the present invention, a part of the die 1 of the lower thick portion 5b where sink marks or the like are likely to occur is replaced by a nesting die 8 having a lower thermal conductivity than a metal such as ceramics or a sand die. In the case of the examples, a shell type having resin sand caking and having a disintegrating property is used.
【００１２】そしてこの入子型８は、例えば図２にも示
すようにキャビティ５の厚肉部分５ｂの一部に臨ませる
だけでなく、同時に水平湯道４と厚肉部分５ｂを結ぶ湯
道９の近傍に臨ませるようにしてもよく、この場合は湯
道９の溶湯の凝固を遅らせて同部の流動性を高めること
が出来る。The insert die 8 not only faces a part of the thick wall portion 5b of the cavity 5 as shown in FIG. 2, but also simultaneously connects the horizontal runner 4 and the thick wall portion 5b. It may be made to face the vicinity of 9, and in this case, the solidification of the molten metal of the runner 9 can be delayed to enhance the fluidity of the same portion.
【００１３】また、実施例ではこの入子型８の一部を金
型１の外部に向けて臨ませているが、かかる構成によっ
てキャビティ５内のガスのガス抜き効果を高めることが
出来る。Further, in the embodiment, a part of the insert mold 8 is exposed to the outside of the mold 1, but such a structure can enhance the effect of degassing the gas in the cavity 5.
【００１４】このような金型１において、キャビティ５
の厚肉部分５ｂに充填された溶湯は湯温の急速な低下が
妨げられ、その間の押湯効果も充分得られてヒケ等の防
止が図られるが、同時に入子型８の熱変形は金属製のも
のに較べて小さく、金型１本体と入子型８の間にバリ差
しが生じたり、製品精度が低下したりするような不具合
がない。In such a mold 1, the cavity 5
The molten metal filled in the thick-walled portion 5b of the insert hinders the rapid decrease of the hot water temperature, and the effect of the feeder can be sufficiently obtained during that time to prevent sink marks and the like, but at the same time, the thermal deformation of the insert die 8 is caused by metal. The size is smaller than that of the manufactured product, and there is no problem such that burrs are inserted between the main body of the mold 1 and the insert mold 8 or the product accuracy is deteriorated.
【００１５】また、実施例のように非金属製で且つ通気
性の良い入子型８の一部をキャビティ５に臨ませ、同時
に一部を金型１外に臨ませることによりガス抜き効果が
高まり、鋳造品質を一層高めることが出来る。Further, as in the embodiment, a part of the non-metal and highly breathable insert mold 8 is exposed to the cavity 5 and at the same time a part of the insert mold 8 is exposed to the outside of the mold 1, so that a degassing effect can be obtained. The casting quality can be further improved.
【００１６】しかも、かかる非金属製の入子型８は、複
雑な形状であっても金属製に較べて比較的簡単且つ安価
に製作することが出来る。Moreover, the non-metal insert die 8 can be manufactured relatively easily and inexpensively even if it has a complicated shape as compared with the case of metal.
【００１７】そして、溶湯が凝固すると型開きして製品
を取り出すが、この際、必要に応じて入子型８を崩壊さ
せて取替えるようにしても良い。When the molten metal solidifies, the mold is opened and the product is taken out. At this time, the insert mold 8 may be collapsed and replaced if necessary.
【００１８】次に、図３及至図５に基づき多数個取りの
金型に適用した実施例について説明する。図３は多数個
取り金型の概要図、図４は下金型の平面図、図５は下金
型の一部斜視図である。Next, an embodiment applied to a multi-cavity mold will be described with reference to FIGS. 3 to 5. 3 is a schematic view of a multi-cavity mold, FIG. 4 is a plan view of the lower mold, and FIG. 5 is a partial perspective view of the lower mold.
【００１９】この多数個取り金型は、図３に示すよう
に、湯口１０に連なる垂直湯道１１と、この垂直湯道１
１の下方から四方向に延出する水平湯道１２、…と、各
水平湯道１２、…に連なる各キャビティ１３、…を備
え、この水平湯道１２とキャビティ１３は、図４に示す
下金型１４と不図示の上金型によって画成される。As shown in FIG. 3, this multi-cavity mold has a vertical runner 11 connected to a sprue 10 and this vertical runner 1
1. The horizontal runners 12 extending in four directions from below 1 and the cavities 13 connected to the horizontal runners 12 are provided with the horizontal runners 12 and the cavities 13 shown in FIG. It is defined by the mold 14 and an upper mold (not shown).
【００２０】そして、下金型１４は、図４、図５に示す
ように、割り面ｍ、ｎを介して更に水平に分割され、各
分割金型１４ａ〜１４ｄには、隣接する２ヶ所のキャビ
ティ１３、１３に臨むことの出来る入子型１５、…を設
けている。As shown in FIGS. 4 and 5, the lower mold 14 is further divided horizontally through the split surfaces m and n, and two separate molds 14a to 14d are adjacent to each other. The insert molds 15, ... Which can face the cavities 13 are provided.
【００２１】そして、この入子型１５は前記と同様に非
金属製のシェル型であり、また、前例と同様、この入子
型１５の一部を水平湯道１２の近傍に臨ませている。そ
して不図示の上金型も、この下金型１４と対称形にほぼ
同様の構成としている。The insert mold 15 is a non-metal shell mold as described above, and a part of the insert mold 15 faces the vicinity of the horizontal runner 12 as in the previous example. . The upper mold (not shown) is also symmetrical to the lower mold 14 and has substantially the same structure.
【００２２】このような多数個取り金型の場合も、前記
と同様に入子型１５を臨ませた部分の凝固速度を遅らせ
てヒケ等を防止することが出来るのみならず、入子型１
５の熱変形等による製品精度の不良、形状不良を防止す
ることが出来、しかも、入子型１５と下金型１４の間の
バリ差しを防止することが出来る。Also in the case of such a multi-cavity mold, not only can sink marks be prevented by slowing the coagulation speed of the portion facing the insert mold 15 as in the case described above, but also the insert mold 1
It is possible to prevent defective product accuracy and defective shape due to thermal deformation of 5 and prevent burrs from being inserted between the insert die 15 and the lower die 14.
【００２３】しかも、この場合は１つの入子型１５を複
数のキャビティ１３に臨ませるようにしていることか
ら、入子型１５のセットが効率的であり、しかも安価に
構成出来る。Further, in this case, since one insert die 15 is made to face the plurality of cavities 13, the insert die 15 can be efficiently set and can be constructed at low cost.
【００２４】[0024]
【発明の効果】以上のように本発明の金型鋳造法は、ヒ
ケ等の生じやすい場所の金型の一部を金型より熱伝導性
の低いセラミックス又は砂入子に置換してキャビティに
臨ませるようにしたため、同部の溶湯の凝固速度を遅ら
せることが出来、その間の押湯効果を充分得ることが出
来てヒケ等の防止が図られるのみならず、入子の熱変形
に伴う製品精度の低下、或いは形状不良といった不具合
を防止することが出来る。また、入子の膨張・収縮差が
小さいため金型本体との間の隙間に生じるバリ差しのよ
うな不具合も抑制される。また、かかるセラミックス又
は砂入子は、金属製の入子に較べて複雑形状でも簡単に
成形出来、しかも安価である。As described above, according to the mold casting method of the present invention, a part of the mold at a place where sink marks or the like are likely to occur is replaced with ceramics or sand inserts having lower thermal conductivity than the mold, and the mold is exposed to the cavity. Since it is made possible, the solidification rate of the molten metal in the same part can be delayed, the effect of the feeder can be sufficiently obtained during that time, and not only sinks etc. can be prevented but also the product accuracy due to thermal deformation of the nest It is possible to prevent a problem such as a decrease in power or a defective shape. In addition, since the difference in expansion and contraction of the insert is small, it is possible to suppress a problem such as burr insertion which occurs in a gap between the insert and the mold body. Further, such a ceramics or sand insert can be easily formed into a complicated shape and is inexpensive as compared with a metal insert.
【図１】本発明に係る金型の構成例図FIG. 1 is a structural example diagram of a mold according to the present invention.
【図２】同一部の斜視図FIG. 2 is a perspective view of the same portion.
【図３】多数個取り金型に適用した場合の概要図[Figure 3] Schematic diagram when applied to a multi-cavity mold
【図４】同下金型の平面図FIG. 4 is a plan view of the lower mold.
【図５】同下金型の一部斜視図FIG. 5 is a partial perspective view of the lower mold.
【図６】従来例図FIG. 6 Conventional example diagram
１ 金型 ５ キャビティ ８ 入子型 1 Mold 5 Cavity 8 Nested mold
フロントページの続き (72)発明者 山口 二三夫 埼玉県狭山市新狭山１丁目10番地１ ホン ダエンジニアリング株式会社内 (72)発明者 坂下 義夫 埼玉県狭山市新狭山１丁目10番地１ ホン ダエンジニアリング株式会社内Front page continued (72) Inventor Fumio Yamaguchi 1-10-1 Shin-Sayama, Sayama-shi, Saitama Prefecture Honda Engineering Co., Ltd. (72) Yoshio Sakashita 1-10-1 Shin-Sayama, Sayama-shi, Saitama Honda Engineering Co., Ltd. In the company
Claims (1)
熱伝導性の低い部材を臨ませて鋳造するようにした金型
鋳造法において、前記熱伝導性の低い部材をセラミック
ス又は砂入子としたことを特徴とする金型鋳造法。1. A mold casting method in which a member having lower thermal conductivity than a mold material is cast in a part of a cavity of the mold to perform casting, and the member having low thermal conductivity is made of ceramic or sand. The mold casting method characterized in that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22093393A JPH0775851A (en) | 1993-09-06 | 1993-09-06 | Metal mold casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22093393A JPH0775851A (en) | 1993-09-06 | 1993-09-06 | Metal mold casting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0775851A true JPH0775851A (en) | 1995-03-20 |
Family
ID=16758835
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22093393A Withdrawn JPH0775851A (en) | 1993-09-06 | 1993-09-06 | Metal mold casting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0775851A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007118071A (en) * | 2005-10-31 | 2007-05-17 | Honda Motor Co Ltd | Method for producing cast product and die |
| JP2011245521A (en) * | 2010-05-27 | 2011-12-08 | Toyota Motor Corp | Die casting method |
| KR20150126813A (en) * | 2013-03-11 | 2015-11-13 | 에이티아이 프로퍼티즈, 인코퍼레이티드 | Enhanced techniques for centrifugal casting of molten materials |
-
1993
- 1993-09-06 JP JP22093393A patent/JPH0775851A/en not_active Withdrawn
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| JP2011245521A (en) * | 2010-05-27 | 2011-12-08 | Toyota Motor Corp | Die casting method |
| KR20150126813A (en) * | 2013-03-11 | 2015-11-13 | 에이티아이 프로퍼티즈, 인코퍼레이티드 | Enhanced techniques for centrifugal casting of molten materials |
| JP2016514056A (en) * | 2013-03-11 | 2016-05-19 | エイティーアイ・プロパティーズ・インコーポレーテッド | Improved technology for centrifugal casting of molten materials. |
| US10252327B2 (en) | 2013-03-11 | 2019-04-09 | Ati Properties Llc | Enhanced techniques for centrifugal casting of molten materials |
| KR20200044142A (en) * | 2013-03-11 | 2020-04-28 | 에이티아이 프로퍼티즈 엘엘씨 | Enhanced techniques for centrifugal casting of molten materials |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20001107 |