JP2002066717A - Method of forming passage for cooling medium in metal cast mold for aluminum wheel - Google Patents
Method of forming passage for cooling medium in metal cast mold for aluminum wheelInfo
- Publication number
- JP2002066717A JP2002066717A JP2000262899A JP2000262899A JP2002066717A JP 2002066717 A JP2002066717 A JP 2002066717A JP 2000262899 A JP2000262899 A JP 2000262899A JP 2000262899 A JP2000262899 A JP 2000262899A JP 2002066717 A JP2002066717 A JP 2002066717A
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- Prior art keywords
- cooling medium
- mold
- hole
- passage
- foregoing
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、竪型ダイカストに
よって溶湯を金型の下方より充填させて、アルミホイー
ルを鋳造するためのアルミホイール鋳造金型用冷却媒体
通路の形成方法に関するものであり、特にスポークとリ
ムの交叉部や意匠面スポーク部反意匠面等の厚肉部付近
の冷却媒体通路の形成方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a cooling medium passage for an aluminum wheel casting mold for casting an aluminum wheel by filling molten metal from below the mold by vertical die casting. In particular, the present invention relates to a method for forming a cooling medium passage near a thick portion such as an intersection between a spoke and a rim and a spoke surface opposite a design surface.
【０００２】[0002]
【従来の技術】アルミホイール鋳造金型においては金型
の局部的な温度上昇を防止するため、一般的には金型内
の温度が高くなる部分に近い所に冷却媒体を通す穴をあ
けるが、構造的に目的の場所近くに冷却媒体用の穴をあ
けることが困難な場合がある。すなわち、アルミホイー
ル用金型の場合、溶湯をキャビテイに充填するゲート
（溶湯鋳込口）が中央部にあり、更に、この近傍にアル
ミホイールを車軸に取付けるための締結用ナット穴を創
生するための鋳抜部、スポークとリムの交叉部やスポー
ク部反意匠面等の厚肉部があり、これらの部位において
は局部的に受熱量が多く、温度上昇が大きいにも拘らず
この部位に冷却媒体用の穴をあけることが難しい。2. Description of the Related Art In an aluminum wheel casting mold, in order to prevent a local temperature rise of the mold, a hole for passing a cooling medium is generally formed near a portion in the mold where the temperature becomes high. In some cases, it is structurally difficult to make a hole for the cooling medium near the intended place. That is, in the case of a mold for an aluminum wheel, a gate (a molten metal pouring port) for filling a cavity with a molten metal is provided at a central portion, and a fastening nut hole for attaching an aluminum wheel to an axle is created near the gate. There are thick parts such as cast-out parts, intersections of spokes and rims and spoke parts anti-design surface, and these parts receive a large amount of heat locally, and despite the large temperature rise, It is difficult to drill holes for cooling media.
【０００３】また、良好なダイカスト製品を得るため
に、湯流れ性の向上と離型性の確保を目的として鋳造サ
イクル毎に金型表面に離型剤を噴霧し、離型剤中の粉末
成分を金型表面に均一に付着させている。ここで、離型
剤の機能について説明する。離型剤は無機質からなる粉
末を水に希釈して、これを金型表面に噴霧して水分を金
型の熱で蒸発させて粉末のみを金型表面に均一に付着さ
せる。また、高圧鋳造、特に射出速度の遅いスクイズ鋳
造においては離型剤の塗布が必須であり、この離型剤は
離型性の向上とともに、溶湯の射出・充填中（キャビテ
ィ内のメタル圧力が低い期間中）には断熱層としての機
能も果たしており、湯流れを良好にしている。更に、保
圧工程ではキャビティ内のメタル圧（溶湯にかかる圧
力）が高くなり、前記断熱層は押し潰されて溶湯から金
型冷却媒体への熱移動を促進できる状態となる。Further, in order to obtain a good die-cast product, a mold release agent is sprayed on a mold surface for each casting cycle for the purpose of improving the flowability of the molten metal and securing the mold release property, and the powder component in the mold release agent is sprayed. Is uniformly attached to the mold surface. Here, the function of the release agent will be described. The release agent dilutes an inorganic powder into water, sprays the powder on the mold surface, evaporates the water with the heat of the mold, and uniformly adheres only the powder to the mold surface. Also, in high-pressure casting, especially in squeeze casting with a slow injection speed, application of a release agent is essential. This release agent improves the releasability and reduces the pressure during the injection and filling of the molten metal (the metal pressure in the cavity is low). During the period), it also functions as a heat insulating layer, and makes the hot water flow good. Further, in the pressure-holding step, the metal pressure in the cavity (the pressure applied to the molten metal) increases, and the heat-insulating layer is crushed so that heat transfer from the molten metal to the mold cooling medium can be promoted.
【０００４】一方、離型剤中の粉末が金型に均一に付着
するためには、金型温度を一定の範囲にしておくことが
必要である。金型温度が高すぎると離型剤中の粉末の金
型表面への付着が悪くなる。逆に、金型温度が低すぎる
と水分が残り、アルミと反応するため鋳造できなくな
る。このため、金型の表面温度を一定の範囲に、且つ、
均一に保持する必要がある。以上のように、金型を局部
的に冷却するには離型剤だけによる冷却では困難なた
め、一般的には金型内部から冷却媒体により除熱を行な
っている。On the other hand, in order for the powder in the release agent to adhere uniformly to the mold, it is necessary to keep the mold temperature within a certain range. If the mold temperature is too high, the adhesion of the powder in the release agent to the mold surface will be poor. Conversely, if the mold temperature is too low, moisture remains and reacts with the aluminum, making casting impossible. Therefore, the surface temperature of the mold is kept within a certain range, and
Must be kept uniform. As described above, since it is difficult to locally cool the mold by cooling only with the release agent, the heat is generally removed from the inside of the mold by the cooling medium.
【０００５】また、一般的に温度の高い部分に離型剤を
噴霧すると、離型剤中の水の潜熱のために表面が急冷さ
れるが、金型の熱伝導に時間遅れがあるので、金型の内
部の温度は高いままで金型表面と内部との温度差が非常
に大きくなり、金型表面に大きな引張の熱応力が発生
し、更に給湯工程で金型表面は急速加熱を受ける。この
ようにして、鋳造工程において金型表面は繰り返しの引
張応力と圧縮応力を受け、このために金型表面や冷却媒
体通路穴のコーナ部等にクラックが発生し、金型寿命を
短命化させている。このような現象は離型剤の噴霧量が
多い程顕著にあらわれる。従って、金型寿命の延命化を
図るためには、離型剤の噴霧量を必要最小限して適正な
金型温度を保持し、均一な離型剤付着を行なうことが重
要である。In general, when a release agent is sprayed on a high temperature part, the surface is rapidly cooled due to latent heat of water in the release agent, but there is a time delay in the heat conduction of the mold. While the temperature inside the mold remains high, the temperature difference between the mold surface and the inside becomes very large, large tensile thermal stress is generated on the mold surface, and the mold surface is rapidly heated in the hot water supply process . In this way, the mold surface is subjected to repeated tensile and compressive stresses in the casting process, and as a result, cracks occur on the mold surface and the corners of the cooling medium passage holes, thereby shortening the life of the mold. ing. Such a phenomenon becomes remarkable as the spray amount of the release agent increases. Therefore, in order to prolong the life of the mold, it is important to maintain a proper mold temperature by minimizing the spray amount of the mold release agent and to uniformly apply the mold release agent.
【０００６】[0006]
【発明が解決しようとする課題】本発明の目的は、強く
冷却したい部分への冷却媒体通路を形成するにあたり、
冷却媒体、特に水で冷却すると冷やしすぎになる所や冷
却媒体通路用の穴に仕切板を設置するのが困難な所を冷
却するのに最適で、且つ、構造の簡単な冷却媒体通路の
形成方法を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to form a cooling medium passage to a portion to be strongly cooled.
Forming a cooling medium passage that is optimal and simple in structure for cooling a place where the cooling medium, especially when cooled with water, becomes too cool or where it is difficult to install a partition plate in a hole for the cooling medium passage. It is to provide a method.
【０００７】[0007]
【課題を解決するための手段】以上のような課題を解決
するために本発明では、竪鋳込アルミホイール鋳造用金
型において、スポークとリムとの交差部のように局部的
に肉厚形状となる部分で且つ、金型外面より直接に冷却
媒体用の穴を穿設できない部分に冷却媒体通路を形成す
るに際し、まず、金型反キャビティ側上面に環状の深溝
を加工し、次に前記深溝から円周方向に複数分割した位
置より上下方向に堅穴を穿設するとともに、前記堅穴と
交差し、且つ、前記厚肉形状部位方向に金型内周側面よ
り斜穴を穿設し、次に、前記堅穴をまたぐように丸棒を
前記斜穴に嵌着し、弾性部材を介して前記丸棒を前記斜
穴先端に押圧するとともに、前記堅穴に冷却媒体が１折
流となるように仕切板を配設し、前記深溝に入口と出口
を残した全域に蓋をして冷却媒体通路を形成するように
した。In order to solve the above-mentioned problems, the present invention provides a vertical casting aluminum wheel casting mold in which a locally thick portion such as an intersection between a spoke and a rim is formed. In forming a cooling medium passage in a portion to be formed and a portion where a hole for a cooling medium cannot be directly formed from the outer surface of the mold, first, an annular deep groove is machined on the upper surface of the mold opposite to the cavity, and then the A solid hole is formed in the vertical direction from a position divided into a plurality of parts in the circumferential direction from the deep groove, and an oblique hole is formed from the inner peripheral side surface of the mold in a direction intersecting with the solid hole and in the direction of the thick portion. Next, a round bar is fitted into the oblique hole so as to straddle the hard hole, the round bar is pressed to the tip of the oblique hole via an elastic member, and the cooling medium flows once into the solid hole. A partition plate is provided so that the entrance and exit are left in the deep groove. And to form a cooling medium passage and.
【０００８】[0008]
【作用】金型キャビティの表面温度はアルミニウム等の
溶湯の凝固熱および顯熱を吸収、蓄熱して上昇する。こ
れらの熱を吸収して金型外へ排出して金型内をある一定
の温度に保つために、離型剤の噴霧による除熱とともに
金型の内部に冷却媒体通路を設けて冷却媒体を流すこと
による除熱も行なっている。本発明は局部的に高温とな
る個所を金型の内部に冷却媒体通路を設けることにより
除熱を行なう方法に関するものである。The surface temperature of the mold cavity rises by absorbing and storing the heat of solidification and heat of the molten metal such as aluminum. In order to absorb these heats and discharge them out of the mold and keep the inside of the mold at a certain temperature, a cooling medium passage is provided inside the mold together with the heat removal by spraying the release agent, and the cooling medium is provided. Heat removal by flowing is also performed. The present invention relates to a method for removing heat by providing a cooling medium passage inside a mold at a location where the temperature becomes locally high.
【０００９】一般的に、冷却能力（除熱能力）が同じで
あれば，鋳造品の厚さの厚い部分は溶湯からの放出熱が
多く、金型温度が高くなり、厚さの薄い部分は溶湯から
の放出熱が少ないので金型温度はあまり高くならない。
一方、溶湯鋳込口付近にはホイール取付け部（ハブ取付
け部）があり、更に、スポーク部やホイール外周コーナ
部のスポークとリムとの交叉部等の厚肉部がある。これ
らの厚肉部は溶湯鋳込み時には大きな熱量を保有するこ
とになり、局部的に温度が高くなる。In general, when the cooling capacity (heat removal capacity) is the same, the thick part of the casting has a large amount of heat released from the molten metal, the mold temperature is high, and the thin part has a small thickness. Since the heat released from the molten metal is small, the mold temperature does not increase so much.
On the other hand, there is a wheel mounting portion (hub mounting portion) near the molten metal casting port, and further, there are a thick portion such as a spoke portion or a crossing portion between a spoke and a rim of a wheel outer peripheral corner portion. These thick portions have a large amount of heat during the casting of the molten metal, and the temperature locally increases.
【００１０】また、リム部は薄肉であり、冷却が強いと
リムフランジ末端までメタル圧が伝達できないため、引
け巣の原因となる。従って、金型上面よりスポークとリ
ムとの交叉部に堅穴を穿設して前記交叉部を冷却するの
はリム部をも強く冷却するので好ましくない。そこで、
リム部より内側に離れた所にキャビティ面に向かって竪
穴を穿設した後、この竪穴を通り前述の交叉部に向かっ
て金型内周側面より斜穴を穿設する。このとき、金型キ
ャビティ面と斜穴先端部との距離（間隔）は適正な値に
保つ必要がある。この間隔が小さすぎると冷却過大にな
るとともに、温度勾配が大きくなり過大な熱応力の発生
原因ともなる。逆に、この間隔が大きすぎると、冷却能
力が不足することになる。Further, the rim portion is thin, and if the cooling is strong, the metal pressure cannot be transmitted to the end of the rim flange, which causes a shrinkage cavity. Therefore, it is not preferable to form a hard hole at the intersection of the spoke and the rim from the upper surface of the mold to cool the intersection because the rim is also strongly cooled. Therefore,
After drilling a vertical hole toward the cavity surface away from the rim, an oblique hole is drilled through the vertical hole from the inner peripheral side of the mold toward the above-mentioned intersection. At this time, the distance (interval) between the mold cavity surface and the tip of the oblique hole must be kept at an appropriate value. If this interval is too small, cooling becomes excessive, and the temperature gradient becomes large, which causes excessive thermal stress. Conversely, if this interval is too large, the cooling capacity will be insufficient.
【００１１】また、冷却媒体がショートパスすることな
く確実に斜穴先端部に流れるようにするためには斜穴内
に仕切板を挿入する必要がある。しかしながら、竪穴と
の関係や金型構造上からも斜穴内に仕切板を挿入するの
は困難である。そこで、この斜穴に熱伝導率の大きな材
料からなる丸棒を先端部及び内周部とも隙間のないよう
に嵌合し、弾性部材で斜穴先端部に強く押圧した状態で
装着する。前記竪穴を貫通している丸棒の部位の手前で
折り返す状態（１折流という）で冷却媒体を流すことに
よりスポークとリムとの交叉部等の肉厚部を適切に冷却
することができる。In order to ensure that the cooling medium flows to the tip of the oblique hole without causing a short path, it is necessary to insert a partition plate into the oblique hole. However, it is difficult to insert the partition plate into the oblique hole from the viewpoint of the relationship with the pit and the mold structure. Therefore, a round bar made of a material having a high thermal conductivity is fitted into the oblique hole so that there is no gap between the distal end portion and the inner peripheral portion, and the oblique hole is attached while being strongly pressed to the oblique hole distal end portion by an elastic member. By flowing the cooling medium in a state of being turned back (referred to as one-fold flow) in front of the portion of the round bar penetrating the vertical hole, it is possible to appropriately cool the thick portion such as the intersection between the spoke and the rim.
【００１２】このようにして、薄肉のリム部の冷却を弱
めながら、厚肉部である前記交叉部を適切に冷却するこ
とができる。これにより、金型温度を所定の温度範囲に
均一に保持するとともに、リム部を適切に冷却すること
が可能となり、溶湯の射出・充填時のメタル圧をリムフ
ランジ末端部まで伝えることができる。従って、厚肉部
の凝固収縮により発生する空隙部に溶湯を補給してひけ
巣の発生を防止し、金型の円周方向の温度差を少なくす
ることによる均一な湯流れと相俟って良好な品質の鋳造
品を鋳造することができる。また、溶湯鋳込み時の金型
温度を均一化することができ、また、金型温度の局部的
な上昇を防止し、金型内部とキャビティ面との温度差
（温度勾配）を小さくすることにより、金型寿命の延命
化を図ることが可能となる。In this way, it is possible to appropriately cool the thicker portion of the cross portion while weakening the cooling of the thin rim portion. As a result, the mold temperature can be maintained uniformly within a predetermined temperature range, the rim can be appropriately cooled, and the metal pressure during injection and filling of the molten metal can be transmitted to the end of the rim flange. Accordingly, the molten metal is replenished to the voids generated by solidification shrinkage of the thick part to prevent the occurrence of sinkholes, and this is combined with the uniform molten metal flow by reducing the temperature difference in the circumferential direction of the mold. Good quality castings can be cast. In addition, it is possible to make the mold temperature uniform during the casting of the molten metal, to prevent the mold temperature from locally increasing, and to reduce the temperature difference (temperature gradient) between the inside of the mold and the cavity surface. Thus, the life of the mold can be extended.
【００１３】[0013]
【発明の実施の形態】図１及び図２によって本発明の実
施の形態を説明する。図１は本発明に使用するアルミホ
イール金型の全体構成図であり、図示しない型締装置に
よって金型が型締めされた状態を示す。１は下金型ない
しは固定金型、２は下金型１の上面側の意匠型、３は下
金型１の下面側のバックアップ型、４は上金型ないしは
可動金型、５は上金型４のスライド型、６は射出スリー
ブ、７は射出プランジャ、８はゲート部、９はゲート切
断ピン、１０は下金型１と上金型４とスライド型５によ
り形成されているキャビテイ（金型空間）である。この
キャビティ１０はハブ部１０ａ、スポーク部１０ｂ、リ
ム部１０ｃ、リムフランジ部１０ｄよりなっている。１
３はホイールを車軸に締結するボルトを取付けるための
鋳抜穴１４（図２（Ｃ）参照のこと）を創生するための
凸部である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an overall configuration diagram of an aluminum wheel mold used in the present invention, and shows a state in which the mold is clamped by a mold clamping device (not shown). 1 is a lower mold or fixed mold, 2 is a design mold on the upper surface side of the lower mold 1, 3 is a backup mold on the lower surface side of the lower mold 1, 4 is an upper mold or a movable mold, and 5 is an upper mold. The slide mold of the mold 4, 6 is an injection sleeve, 7 is an injection plunger, 8 is a gate section, 9 is a gate cutting pin, and 10 is a cavity (metal) formed by the lower mold 1, the upper mold 4 and the slide mold 5. Type space). The cavity 10 includes a hub 10a, a spoke 10b, a rim 10c, and a rim flange 10d. 1
Reference numeral 3 denotes a projection for creating a cast hole 14 (see FIG. 2C) for attaching a bolt for fastening the wheel to the axle.
【００１４】バックアップ型３は中央部に円柱状の有底
穴を有した凹部２２となっており，バックアップ型３の
上に意匠型２が嵌合されて意匠型２とバックアップ型３
相互の芯ずれを防止し得るようになっている。なお、符
号２４は意匠型２とバックアップ型とを一体化するため
の締付ボルトである。また、上金型４の反キャビティ側
上面には環状の深溝４１が設けられている。図２（Ｃ）
に示すように、この深溝４１には外部に設置した図示し
ない冷却媒体循環ユニットと接続するための冷却媒体出
入口４２が形成されている。冷却媒体出入口４２は、入
口通路４２ａと出口通路４２ｂより構成されており、ま
た、冷却媒体のショートパスを防止するために入口通路
と出口通路の間に深溝用仕切板４８が配設されている。The backup mold 3 is a concave portion 22 having a cylindrical bottomed hole at the center, and the design mold 2 is fitted on the backup mold 3 so that the design mold 2 and the backup mold 3 are joined together.
Mutual misalignment can be prevented. Reference numeral 24 denotes a tightening bolt for integrating the design mold 2 and the backup mold. An annular deep groove 41 is provided on the upper surface of the upper mold 4 on the side opposite to the cavity. FIG. 2 (C)
As shown in FIG. 5, a cooling medium inlet / outlet 42 for connecting to a cooling medium circulation unit (not shown) installed outside is formed in the deep groove 41. The cooling medium inlet / outlet 42 includes an inlet passage 42a and an outlet passage 42b, and a deep groove partition plate 48 is provided between the inlet passage and the outlet passage to prevent a short path of the cooling medium. .
【００１５】図２（Ｃ）に示すように、環状の深溝４１
にはスポーク（ディスクともいう）部のほぼ中央に堅穴
４３が穿設されている。上金型４の内周面よりこの堅穴
４３を通りスポークの反意匠面肉厚部近傍まで斜穴４４
を穿設する。この斜穴４４は深すぎると斜穴先端の厚み
が薄くなるとともに溶湯鋳込時の金型キャビティ表面と
斜穴先端部との温度差が大きくなり、大きな熱応力が発
生するので好ましくない。次に、この斜穴４４に熱伝導
率の大きな材料からなる丸棒４５を適度のシメシロをつ
けて嵌めこむ。このとき、丸棒４５の先端が斜穴底部に
隙間なく接するように押し込む必要がある。また、丸棒
４５の材料としては銅が好ましい。As shown in FIG. 2C, an annular deep groove 41 is formed.
Is provided with a hard hole 43 substantially at the center of a spoke (also called a disk) portion. The oblique hole 44 extends from the inner peripheral surface of the upper mold 4 through the hard hole 43 to the vicinity of the thicker portion of the anti-design surface of the spoke.
Drilling. If the oblique hole 44 is too deep, the thickness of the oblique hole tip becomes thin, and the temperature difference between the surface of the mold cavity and the oblique hole tip at the time of casting the molten metal becomes large. Next, a round bar 45 made of a material having a high thermal conductivity is fitted into the oblique hole 44 with an appropriate squeeze. At this time, it is necessary to push the round bar 45 so that the tip of the round bar 45 contacts the bottom of the oblique hole without any gap. Further, copper is preferable as the material of the round bar 45.
【００１６】一方、鋳造サイクルの繰り返しにより丸棒
４５の先端と斜穴底部との間に隙間が生じることがあ
る。これは最初に丸棒（銅棒）４５を斜穴４４に装着し
た後、キャビティ１０に溶湯が鋳込まれた際に銅棒４５
は加熱され、溶湯充填直後金型を冷却する際に銅棒４５
が収縮する。このように鋳造サイクル毎に銅棒４５が膨
張と圧縮を繰り返すことにより銅棒の表面にヘタリが発
生して、棒４５の先端と斜穴底部との間に隙間が生じる
ことになる。このような隙間が発生するとこの部分での
熱伝達率が低下し除熱能力が不足することになる。これ
を防ぐために、棒４５を斜穴底部に押付ける工夫が必要
となる。本実施例においては、弾性部材４６としてコイ
ルバネを使用し、閉止金物４７とコイルバネ４６により
銅棒４５を付勢する構成とした。なお、閉止金物４７は
斜穴にネジ方式で係止している。On the other hand, a gap may occur between the tip of the round bar 45 and the bottom of the oblique hole due to the repetition of the casting cycle. This is because a round bar (copper bar) 45 is first attached to the oblique hole 44 and then when the molten metal is cast into the cavity 10, the copper bar 45 is inserted.
Is heated, and the copper rod 45 is cooled immediately after the mold is cooled.
Contracts. By repeatedly expanding and compressing the copper rod 45 in each casting cycle, settling occurs on the surface of the copper rod, and a gap is generated between the tip of the rod 45 and the bottom of the oblique hole. When such a gap is generated, the heat transfer coefficient at this portion decreases, and the heat removal ability becomes insufficient. In order to prevent this, a device for pressing the rod 45 against the bottom of the oblique hole is required. In this embodiment, a coil spring is used as the elastic member 46, and the copper bar 45 is urged by the closing metal 47 and the coil spring 46. The closing hardware 47 is screwed into the oblique hole.
【００１７】このようにして、丸棒４５の加熱・冷却に
よる拡縮によって丸棒４５と斜穴先端部との間に隙間が
生じるのを防止している。こうすることにより、スポー
ク部１０ｂに到達した溶湯の熱は丸棒４５に伝わり、熱
伝導率の高い丸棒４５中を伝わって冷却媒体に接する銅
棒の部位が冷却されることによってスポーク部１０ｂの
冷却が促進される。In this manner, a gap is prevented from being formed between the round bar 45 and the tip of the oblique hole due to the expansion and contraction of the round bar 45 due to heating and cooling. By doing so, the heat of the molten metal that has reached spoke portion 10b is transmitted to round bar 45, and transmitted through round bar 45 having a high thermal conductivity to cool the portion of the copper bar in contact with the cooling medium, so that spoke portion 10b is cooled. Cooling is promoted.
【００１８】このようにスポーク部１０ｂに蓄熱されて
いる大量の熱を除熱することにより、金型キャビティの
表面温度は均一になり、離型剤を金型表面に均一に、効
率良く付着させることができる。なお、丸棒４５の直径
と堅穴４３の直径との関係は、冷却媒体通路の流れ抵抗
を考慮して決定することができる。即ち、堅穴４３先端
部を１折流で折り返して流れる冷却媒体に大きな流通抵
抗が生じないようにすることが望ましい。また、冷却媒
体としては、一般的には水が望ましいが、油などを用い
ることもできる。By removing a large amount of heat stored in the spoke portions 10b in this manner, the surface temperature of the mold cavity becomes uniform, and the release agent is uniformly and efficiently adhered to the mold surface. be able to. The relationship between the diameter of the round bar 45 and the diameter of the hard hole 43 can be determined in consideration of the flow resistance of the cooling medium passage. In other words, it is desirable that the cooling medium flowing by bending the tip of the hard hole 43 in one folding flow does not generate a large flow resistance. As the cooling medium, water is generally desirable, but oil or the like can also be used.
【００１９】以上のように構成されたアルミホイール鋳
造用金型を用いて、アルミホイールを成形する場合の動
作について述べる。まず、型締を行うとともに、溶湯が
注入された射出スリーブ６をバックアップ型３に接合し
ている状態で射出シリンダにより射出プランジャ７を前
進させると、溶湯は射出プランジャ７に押され、キャビ
ティ１０内へ射出・充填される。The operation in the case of forming an aluminum wheel using the aluminum wheel casting mold configured as described above will be described. First, when the injection plunger 7 is advanced by the injection cylinder while the injection sleeve 6 in which the molten metal is injected is joined to the backup die 3 while the mold is clamped, the molten metal is pushed by the injection plunger 7 and Injection and filling.
【００２０】キャビティ１０内にアルミニウム溶湯を射
出・充填後、金型の冷却・鋳造品の取出しまでの一連の
鋳造・成形の動作中は、常時、冷却媒体を金型内に循環
させておく。即ち、図２（Ｃ）に示すように、冷却媒体
は冷却媒体入口通路４２ａから導入され、環状の深溝４
１、竪穴用仕切板４９により隔壁された竪穴４３の半分
を経由して丸棒４５を冷却し、その後、竪穴４３の残り
半分を経由して深溝４１に達する。これを竪穴の数だけ
繰り返して流れた後、冷却媒体出口通路４２ｂから排出
される。After the injection and filling of the molten aluminum into the cavity 10, the cooling medium is constantly circulated in the mold during a series of casting and molding operations from cooling of the mold to removal of the casting. That is, as shown in FIG. 2 (C), the cooling medium is introduced from the cooling medium inlet passage 42a, and the annular deep groove 4
1. The round bar 45 is cooled through half of the vertical hole 43 partitioned by the vertical partition plate 49, and then reaches the deep groove 41 through the other half of the vertical hole 43. This is repeated by the number of pits, and then discharged from the cooling medium outlet passage 42b.
【００２１】キャビティ１０への溶湯の充填が完了する
と、金型は冷却されキャビティ１０内に充填された溶湯
は固化するが、冷却媒体の連続的な流通によって丸棒４
５の先端部は冷却され、丸棒４５内に温度勾配ができ高
い熱伝導率によってスポーク部１０ｂに蓄熱されている
大量の熱を除熱できるようになっている。When the filling of the cavity 10 with the molten metal is completed, the mold is cooled and the molten metal filled in the cavity 10 is solidified.
5 is cooled, a temperature gradient is formed in the round bar 45, and a large amount of heat stored in the spoke portion 10b can be removed by a high thermal conductivity.
【００２２】[0022]
【発明の効果】以上に説明したように本発明の効果は下
記の通りである。 （１）薄肉のリム部の冷却を弱めながら、厚肉部である
スポークとリムとの交叉部を強力に冷却することができ
る。従って、金型温度を所定の温度範囲に均一に保持す
るとともに、リム部を適切に除冷することが可能とな
り、溶湯の射出・充填時のメタル圧をリムフランジ末端
部まで伝えることができる。これにより、厚肉部の凝固
収縮により発生する空隙部に溶湯を補給してひけ巣の発
生を防止し、金型の円周方向の温度差が少ないことによ
る均一な湯流れと相俟って良好な品質の鋳造品を鋳造す
ることができる。 （２）また、溶湯鋳込み時の金型温度の局部的な上昇を
防止し、金型温度を均一化することができる。従って、
金型内部とキャビティ面との温度差（温度勾配）を小さ
くすることにより、金型寿命の延命化を図ることができ
る。 （３）更に、弾性部材により丸棒を斜穴底部に押圧する
ことにより、丸棒の加熱・冷却による拡縮によって丸棒
と斜穴先端部との間に隙間が生じるのを防止することが
できる。これにより、厚肉部よりの除熱を確実に行なう
ことが可能となった。As described above, the effects of the present invention are as follows. (1) While the cooling of the thin rim portion is weakened, the intersection portion between the spoke and the rim, which is the thick portion, can be strongly cooled. Therefore, the mold temperature can be maintained uniformly within a predetermined temperature range, and the rim portion can be appropriately cooled, and the metal pressure during injection and filling of the molten metal can be transmitted to the rim flange end portion. Thereby, the molten metal is replenished to the void portion generated by the solidification shrinkage of the thick portion to prevent the occurrence of sink marks, and this is combined with the uniform molten metal flow due to the small temperature difference in the circumferential direction of the mold. Good quality castings can be cast. (2) Further, it is possible to prevent a local rise in the mold temperature at the time of casting the molten metal, and to make the mold temperature uniform. Therefore,
By reducing the temperature difference (temperature gradient) between the inside of the mold and the cavity surface, it is possible to extend the life of the mold. (3) Further, by pressing the round bar against the bottom of the oblique hole by the elastic member, it is possible to prevent a gap from being generated between the round bar and the tip of the oblique hole due to expansion and contraction due to heating and cooling of the round bar. . This has made it possible to reliably remove heat from the thick portion.
【図１】図１は本発明に使用するアルミホイール金型の
全体構成図である。FIG. 1 is an overall configuration diagram of an aluminum wheel mold used in the present invention.
【図２】図２は本発明に係る冷却媒体通路の形成方法を
説明するための要部拡大図であり、（Ａ）は断面図であ
り、（Ｂ）は（Ａ）におけるＰ−Ｐ位置での断面図、
（Ｃ）はホイール（金型ではない）平面図に金型に形成
する冷却媒体通路及び金型を想像線で示したものであ
る。FIG. 2 is an enlarged view of a main part for describing a method of forming a cooling medium passage according to the present invention, in which (A) is a cross-sectional view, and (B) is a PP position in (A). Cross section at
(C) is a plan view of a cooling medium passage and a mold formed in the mold in a wheel (not a mold) plan view by imaginary lines.
１ 下金型（固定金型） ２ 意匠型 ３ バックアップ型 ４ 可動金型（上金型） ５ スライド型 ６ 射出スリーブ ７ 射出プランジャ ８ ゲート部 ９ ゲート切断ピン １０ キャビティ（金型空間） １０ａ ハブ部（ホイール取付け部） １０ｂ スポーク部（ディスク部） １０ｃ リム部 １０ｄ リムフランジ部 １１ｅ ホイール取付け部（ハブ取付け部） １３ 突起部（凸部） １４ 鋳抜穴 １８ 蓋（カバー） ２２ 凹部 ２４ 締付ボルト ３０ 溶湯鋳込口 ４１ 環状の深溝 ４２ 冷却媒体出入口 ４２ａ （冷却媒体）入口通路 ４２ｂ （冷却媒体）出口通路 ４３ 竪穴 ４４ 斜穴 ４５ 丸棒 ４６ 弾性部材 ４７ 閉止金物 ４８ 深溝用仕切板 ４９ 竪穴用仕切板 １００ アルミホイール金型 Reference Signs List 1 lower die (fixed die) 2 design die 3 backup die 4 movable die (upper die) 5 slide die 6 injection sleeve 7 injection plunger 8 gate part 9 gate cutting pin 10 cavity (die space) 10a hub part (Wheel mounting part) 10b Spoke part (disk part) 10c Rim part 10d Rim flange part 11e Wheel mounting part (hub mounting part) 13 Projection part (convex part) 14 Cast-out hole 18 Lid (cover) 22 Depression 24 Tightening bolt Reference Signs List 30 molten metal casting port 41 annular deep groove 42 cooling medium inlet / outlet 42a (cooling medium) inlet passage 42b (cooling medium) outlet passage 43 vertical hole 44 oblique hole 45 round bar 46 elastic member 47 closing hardware 48 deep groove partitioning plate 49 vertical hole partition Plate 100 Aluminum wheel mold
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｂ２２Ｄ 17/00 Ｂ２２Ｄ 17/00 Ｂ Ｂ６０Ｂ 3/06 Ｂ６０Ｂ 3/06 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) B22D 17/00 B22D 17/00 B B60B 3/06 B60B 3/06
Claims (1)
て、スポークとリムとの交差部のように局部的に肉厚形
状となる部分で且つ、金型外面より直接に冷却媒体用の
穴を穿設できない部分に冷却媒体通路を形成するに際
し、 まず、金型反キャビティ側上面に環状の深溝を加工し、
次に前記深溝から円周方向に複数分割した位置より上下
方向に堅穴を穿設するとともに、前記堅穴と交差し、且
つ、前記厚肉形状部位方向に金型内周側面より斜穴を穿
設し、 次に、前記堅穴をまたぐように丸棒を前記斜穴に嵌着
し、弾性部材を介して前記丸棒を斜穴先端に押圧すると
ともに、前記堅穴に冷却媒体が１折流となるように仕切
板を配設し、前記深溝に入口と出口を残した全域に蓋を
して冷却媒体通路を形成するようにしたことを特徴とす
るアルミホイール鋳造金型用冷却媒体通路の形成方法。In a vertical casting aluminum wheel casting mold, a hole for a cooling medium is formed in a locally thick portion such as an intersection of a spoke and a rim, and directly from an outer surface of the mold. When forming the cooling medium passage in the part that cannot be drilled, first, an annular deep groove is machined on the upper surface of the mold opposite to the cavity,
Next, while drilling a solid hole in the vertical direction from a position divided into a plurality of pieces in the circumferential direction from the deep groove, and crossing the solid hole, and forming an oblique hole from the inner peripheral side surface of the mold in the direction of the thick portion. Then, a round bar is fitted into the oblique hole so as to straddle the hard hole, and the round bar is pressed to the tip of the oblique hole via an elastic member, and the cooling medium is inserted into the solid hole by 1 mm. A cooling medium for an aluminum wheel casting mold, wherein a partition plate is arranged so as to form a flow, and a cooling medium passage is formed by covering the entire area except for an inlet and an outlet in the deep groove. The method of forming the passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000262899A JP3707372B2 (en) | 2000-08-31 | 2000-08-31 | Method for forming coolant passage for aluminum wheel casting mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000262899A JP3707372B2 (en) | 2000-08-31 | 2000-08-31 | Method for forming coolant passage for aluminum wheel casting mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002066717A true JP2002066717A (en) | 2002-03-05 |
| JP3707372B2 JP3707372B2 (en) | 2005-10-19 |
Family
ID=18750511
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000262899A Expired - Fee Related JP3707372B2 (en) | 2000-08-31 | 2000-08-31 | Method for forming coolant passage for aluminum wheel casting mold |
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| Country | Link |
|---|---|
| JP (1) | JP3707372B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104353809A (en) * | 2014-12-05 | 2015-02-18 | 重庆戴卡捷力轮毂制造有限公司 | Water-cooled die-casting die for manufacturing aluminium alloy hubs |
| CN104353808A (en) * | 2014-12-05 | 2015-02-18 | 重庆戴卡捷力轮毂制造有限公司 | Water-cooled die casting mold for manufacturing aluminum alloy wheel hub |
| CN107252877A (en) * | 2017-08-09 | 2017-10-17 | 佛山市南海奔达模具有限公司 | Mould multiple spot cooling body and its hub mold of application |
| CN111842842A (en) * | 2020-08-04 | 2020-10-30 | 中信戴卡股份有限公司 | Side forms and wheel hub low pressure casting mould |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110640111A (en) * | 2019-09-26 | 2020-01-03 | 浙江华朔科技股份有限公司 | Die casting die for rapidly cooling embedded part |
-
2000
- 2000-08-31 JP JP2000262899A patent/JP3707372B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104353809A (en) * | 2014-12-05 | 2015-02-18 | 重庆戴卡捷力轮毂制造有限公司 | Water-cooled die-casting die for manufacturing aluminium alloy hubs |
| CN104353808A (en) * | 2014-12-05 | 2015-02-18 | 重庆戴卡捷力轮毂制造有限公司 | Water-cooled die casting mold for manufacturing aluminum alloy wheel hub |
| CN107252877A (en) * | 2017-08-09 | 2017-10-17 | 佛山市南海奔达模具有限公司 | Mould multiple spot cooling body and its hub mold of application |
| CN111842842A (en) * | 2020-08-04 | 2020-10-30 | 中信戴卡股份有限公司 | Side forms and wheel hub low pressure casting mould |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3707372B2 (en) | 2005-10-19 |
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