JP3935088B2

JP3935088B2 - Die casting mold

Info

Publication number: JP3935088B2
Application number: JP2003044132A
Authority: JP
Inventors: 謙次村
Original assignee: 有限会社村製作所
Priority date: 2003-02-21
Filing date: 2003-02-21
Publication date: 2007-06-20
Anticipated expiration: 2023-02-21
Also published as: JP2004249350A

Description

【０００１】
【発明の属する技術分野】
この発明は、金属のダイカスト成形を行うための金型に用いられるガス抜き部の構造に関する。
【０００２】
【従来の技術】
【特許文献１】
実公平８−７９７０号公報
従来、金属製品のダイカスト成型に用いられる金型は、製品を成型する一対の金型から成り、その金型の一端に設けられ溶融金属である溶湯を注入する湯口と、溶湯が流れる湯道と、製品成形用のキャビティを備える。さらに、このキャビティにはガス抜き用の通路が形成されている。そして、この金型をダイカスト成型装置に取り付け、溶湯がキャビティ内に送り込まれて成型が行なわれる。ここで、このダイカスト用金型のガス抜き用の通路は特許文献１に開示されているように、キャビティ部分から連続する空間の通路であり、溶湯が噴流状態で金型のキャビティ内に注入される際の金型内のガスを適切に抜く働きをする。これにより、製品が成型される際に、成型品内にガスを巻き込んだりすることによる欠陥の発生を防止している。
【０００３】
このガス抜き用の通路空間は、特許文献１のように、波状の幅の広い凹凸を持った一対のガス抜き用ブロックを成形用金型に取り付けて対向させ、波状のガス抜き通路である空間を形成し、キャビティ内のガスを外部に逃がす構造となっていた。
【０００４】
【発明が解決しようとする課題】
しかし、このような金型構造では、ガス抜き用ブロックの雌型部分の凹溝部の形成上、ガス抜き通路を形成する波状部分と、その側面の覆い板とが別々に設けられていた。従って、この波状部分と覆い板の両者の位置が合わせが難しく、位置ずれが生じやすいものであった。さらに、この位置ずれによりその隙間に溶湯が浸入したりして、金型を損傷したり製品の歩留まりを低下させたりしていた。しかも、ガス抜き用ブロックの部品点数が多く、金型の組み立て工数がかかり、コストも高くなりやすいものであった
この発明は、上記従来技術の問題点に鑑みなされたもので、ガス抜き用の通路部分が簡単な構造で、且つガス抜きが容易確実なダイカスト用金型を提供することを目的とする。
【０００５】
【課題を解決するための手段】
この発明は、固定型と可動型の一対の成型用金型から成り、この各成型用金型には成型用キャビティに連通するガス抜き通路を形成するガス抜き用ブロックが設けられ、各ガス抜き用ブロックは互いに対向する複数の波状部を有し、この波状部は互いに対向した状態で所定間隔の隙間を形成し、この隙間がガス抜き通路として上記成型用キャビティに連通し、上記固定型に設けられた一方のガス抜き用ブロックは雄型であり、波状部である複数の凸条部が互いに平行に一定間隔で形成され、上記可動型に設けられた他方のガス抜き用ブロックは雌型であり、複数の溝状の凹溝部が平行に一定間隔で形成された波状部構成部材と、この波状部構成部材を収容した凹形状の保持部材とから成り、上記凹溝部は上記凸条部と等ピッチで形成され、上記波状部構成部材の基部には下端部に向かって広がったテーパ部が両側面に形成され、このテーパ部を有する基部と同形の収容空間が上記他方のガス抜き用ブロックの保持部材に形成され、上記収容部への上記波状部構成部材の嵌合方向が上記波状部の波の進行方向であり、上記波状部構成部材の基部を上記保持部材の収容部に合わせて側方から上記波状部の波の進行方向に摺動させて嵌合し、上記各ガス抜き用ブロックの波状部による隙間の上記ガス抜き通路を設定する位置決めを行い、ボルトにより上記波状部構成部材と上記保持部材とを一体に固定して成るダイカスト用金型である。
【０００６】
さらに、上記ガス抜き通路は、上記キャビティ側に繋がる最初の上記波状部による隙間を僅かに広くし、その後の上記隙間を相対的に僅かに狭いものである。また、上記波状部は、角を丸めた台形波状または矩形波状に形成されている。
【０００７】
この発明のダイカスト用金型は、成形用金型内に設けられたガス抜き用金型の雌型を、波状部構成部材とその基部を収容し固定する凹形状の保持部材により構成し、波状部構成部材と保持部材との隙間に溶湯が浸入しないようにしたものである。
【０００８】
【発明の実施の形態】
以下、この発明の一実施形態について、図面に基づいて説明する。この実施形態のダイカスト用金型１０は、図１に示すように、成型用金型である固定型１１と可動型１２とを備え、固定型１１及び可動型１２の上部に、ガス抜き用ブロック１３，１４が各々埋設され固定されている。ガス抜き用ブロック１３，１４は、固定型１１と可動型１２とにより形成される成型用キャビティ１６に連通するガス抜き通路を形成するもので、可動型１２のガス抜き通路１８に一端が連通している。
【０００９】
固定型１１に設けられたガス抜き用ブロック１３は雄型であり、波状部である複数の凸条部２０が互いに平行に一定間隔で形成され、凸条部２０の長手方向に対して直角方向の断面が波形に設けられて波状部を構成している。
【００１０】
また、可動型１２に設けられたガス抜き用ブロック１４は雌型であり、波状部である複数の溝状の凹溝部２２が平行に一定間隔で形成された波状部構成部材２４と、この波状部構成部材２４を収容した凹形状の保持部材２６とから成る。凹溝部２２は凸条部２０と等ピッチで形成され、図２に示すように、凸条部２０を凹溝部２２がほぼ一定の隙間を空けて収容し、凹溝部２２間の仕切部２７は凸条部２０間の谷間２８に一定の隙間を形成して入り込んでいる。この一定の隙間は、ガス抜き用ブロック１３の通路２９を介して、固定型１１と可動型１２のガス抜き通路１８に連通し、波状のガス抜き通路３０を形成している。ガス抜き通路３０の他端は、ガス抜き用ブロック１３，１４の端部に連通して、大気に解放されている。なお、このガス抜き通路３０は通路２９に繋がる最初の数本の凹凸部による隙間を僅かに広くし、その後の隙間を僅かに狭いものとするとよい。これにより、ガスの排出がより容易となるとともに溶湯の噴出を確実に防止する。
【００１１】
ガス抜き用ブロック１４は、波状部構成部材２４の基部２４ａが下端部に向かって広がったテーパ部３２が両側面に形成され、このテーパ部３２を有する基部２４ａと同形の収容空間が形成され、基部２４ａを密に嵌合する収容部３４が保持部材２６に形成されている。
【００１２】
また、波状部構成部材２４の波状部である凹溝部２２が形成された部分は、凹溝部２２の解放面に向かうに従いテーパ３２とは逆に広がる形状に設けられている。このガス抜き用ブロック１４が２部材で構成されているのは、凹溝部２２が保持部材２６の型の合わせ面よりも内側に形成されるため、凹溝部２２の溝形成を容易且つ安価にするために、波状部構成部材２４を別体としている。
【００１３】
この実施形態のダイカスト用金型１０の組み立ては、固定型１１にガス抜き用ブロック１３を図示しないボルトにより固定し、凸条部２０が固定型１１の合わせ面から突出した状態に設ける。また、可動型１２に設けるガス抜き用ブロック１４は、先ず、波状部構成部材２４の基部２４ａを、保持部材２６の収容部３４に合わせて側方から摺動させて嵌合する。位置決めした後、図示しないボルトにより波状部構成部材２４と保持部材２６とを一体に固定する。この後、ガス抜き用ブロック１４を可動型１２の所定位置に固定する。このとき、凹溝部２２は固定型１１の凸条部２０と対向して位置する。
【００１４】
このダイカスト用金型１０を用いたダイカスト成型は、周知の通り、図示しない射出プランジャーにより、溶湯が金型の湯口から成型用キャビティ１６に噴流され、その際に成型用キャビティ１６内のガスが、ガス抜き通路１８を経て、ガス抜き用ブロック１３，１４により形成される波状のガス抜き通路３０に逃げ、金型外に放出される。また、この波状のガス抜き通路３０により、溶湯が波形部分に接触する際に冷却凝固され、溶湯のフラッシングが防止される。
【００１５】
この実施形態のダイカスト用金型１０によれば、ガス抜き用ブロック１４が、波状部構成部材２４と保持部材の２部材で構成され、波状構成部材２４の基部２４ａを保持部材２６の収容部３４に嵌合させることにより位置決めされるので、正確に位置決めする事ができ、ずれることもない。しかもテーパ部３２により収容部３４に嵌合するので、上方に抜けることが無く、摺動方向にはピン等により簡単に固定することができる。また、ガス抜き用ブロック１３の冷却液の通路部分の形成も保持部材２６に容易に形成可能であり、ガスの吸引タイプの装置にも容易に適用可能なものである。また、ガス抜き通路３０の波状部は、角を丸めた台形波状または矩形波状に形成されているので、製品の型抜き時の型離れが良く、ガス抜き通路３０に溶湯の固まりが固着することがない。
【００１６】
【発明の効果】
この発明によれば、ガス抜き用ブロックが、波状部構成部材と保持部材との２部材で構成され、波状構成部材の基部を保持部材の収容部に嵌合させることにより、取り付け及び位置決めされ、正確に位置決め固定する事ができる。従って波状部の位置ずれもなく、溶湯が部材の当接部間の隙間に浸入したりすることもなく、金型の耐久性も増す。また、波状部構成部材のテーパ部を保持部材の収容部に嵌合するだけで正確に位置決めが成され、取り付け強度も高い。さらに、ガスの排出がより容易となるとともに溶湯の噴出を確実に防止するものである。また、波状部を、角を丸めた台形波状または矩形波状とすることにより、固化した溶湯の型離れも良いものである。
【図面の簡単な説明】
【図１】この発明の第一実施形態のダイカスト用金型を示す斜視図である。
【図２】この実施形態のダイカスト用金型のガス抜き用ブロックを示す縦断面図である。
【図３】この実施形態のガス抜き用ブロックの雄型を示す平面図である。
【図４】この実施形態のガス抜き用ブロックの雄型を示す正面図である。
【図５】この実施形態のガス抜き用ブロックの雌型を示す平面図である。
【図６】この実施形態のガス抜き用ブロックの雌型を示す正面図である。
【符号の説明】
１０ダイカスト用金型
１１固定型
１２可動型
１３，１４ガス抜き用ブロック
１６成型用キャビティ
１８，３０ガス抜き用通路
２０凸条部
２２凹溝部
２４波状部構成部材
２４ａ基部
２６保持部材
３２テーパ部
３４収容部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure of a gas vent used in a metal mold for performing metal die casting.
[0002]
[Prior art]
[Patent Document 1]
In fact, a mold used for die casting of a metal product is composed of a pair of molds for molding the product, and a gate for pouring a molten metal, which is provided at one end of the mold, is a molten metal. It has a runner through which molten metal flows and a cavity for product molding. Further, a degassing passage is formed in this cavity. And this metal mold | die is attached to a die-casting apparatus, and molten metal is sent in in a cavity, and shaping | molding is performed. Here, the degassing passage of this die casting mold is a passage of a space continuous from the cavity portion as disclosed in Patent Document 1, and the molten metal is injected into the mold cavity in a jet state. It works to draw out the gas in the mold properly. Thereby, when the product is molded, the occurrence of defects due to entrainment of gas in the molded product is prevented.
[0003]
This degassing passage space is a space that is a wavy degassing passage by attaching a pair of degassing blocks having wide wavy irregularities to a molding die so as to face each other as in Patent Document 1. And the gas in the cavity escapes to the outside.
[0004]
[Problems to be solved by the invention]
However, in such a mold structure, the corrugated portion forming the gas vent passage and the side cover plate are separately provided in forming the concave groove portion of the female mold portion of the gas vent block. Therefore, it is difficult to align the position of both the wavy portion and the cover plate, and the position shift tends to occur. Furthermore, this misalignment causes the molten metal to enter the gap, thereby damaging the mold and reducing the product yield. Moreover, the number of parts of the degassing block is large, the number of man-hours for assembling the mold is increased, and the cost is likely to be high.This invention is made in view of the problems of the prior art, and is used for degassing. An object of the present invention is to provide a die-casting mold having a simple passage portion and easy and reliable gas venting.
[0005]
[Means for Solving the Problems]
The present invention comprises a pair of molding dies of a fixed mold and a movable mold, and each molding mold is provided with a degassing block for forming a degassing passage communicating with the molding cavity. use block has a plurality of corrugations facing each other, the corrugations form a gap of a predetermined distance so as to face each other, this gap communicates with the molding cavity as a gas vent passage, the said fixed mold One provided degassing block is a male type, and a plurality of ridges that are wave-like parts are formed in parallel with each other at a constant interval, and the other degassing block provided in the movable mold is a female type A plurality of groove-shaped concave groove portions formed in parallel at regular intervals and a wave-shaped portion constituting member, and a concave-shaped holding member that accommodates the wave-shaped portion constituting member, wherein the groove portion is the ridge portion. And formed at equal pitch and above Tapered portions that widen toward the lower end are formed on both sides of the base portion of the wave-shaped component member, and an accommodation space having the same shape as the base portion having this tapered portion is formed in the holding member of the other degassing block, The fitting direction of the corrugated part constituting member to the accommodating part is the traveling direction of the wave of the corrugated part, and the base part of the corrugated part constituting member is aligned with the accommodating part of the holding member from the side of the corrugated part. Slide and fit in the wave traveling direction, perform positioning to set the degassing passage of the gap by the undulating portion of each degassing block, and integrate the undulating member constituting member and the holding member with bolts This is a die-casting die fixed to the die.
[0006]
Further, the gas vent passage slightly widens the gap due to the first wavy portion connected to the cavity side, and relatively narrows the gap thereafter. Further, the wavy portion is formed in a trapezoidal wave shape or a rectangular wave shape with rounded corners.
[0007]
The die casting mold according to the present invention comprises a female mold of a degassing mold provided in a molding mold, comprising a corrugated part constituting member and a concave holding member for receiving and fixing the base part, The molten metal is prevented from entering the gap between the member constituting member and the holding member.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the die casting mold 10 of this embodiment includes a fixed mold 11 and a movable mold 12 which are molding molds, and a degassing block above the fixed mold 11 and the movable mold 12. 13 and 14 are respectively embedded and fixed. The degassing blocks 13 and 14 form a degassing passage communicating with the molding cavity 16 formed by the fixed mold 11 and the movable mold 12, and one end communicates with the degassing path 18 of the movable mold 12. ing.
[0009]
The degassing block 13 provided in the fixed mold 11 is a male mold, and a plurality of ridges 20 that are wave-like portions are formed in parallel to each other at regular intervals, and are perpendicular to the longitudinal direction of the ridges 20. The cross section is provided in a waveform to form a wave-shaped portion.
[0010]
Further, the degassing block 14 provided in the movable mold 12 is a female mold, and a wave-shaped component member 24 in which a plurality of groove-shaped concave grooves 22 that are wave-shaped portions are formed in parallel at regular intervals, and the wave-shaped block. It consists of a concave holding member 26 that houses the component member 24. The concave groove portions 22 are formed at the same pitch as the convex groove portions 20, and as shown in FIG. 2, the concave groove portions 22 accommodate the convex groove portions 20 with a substantially constant gap, and the partition portion 27 between the concave groove portions 22 is A certain gap is formed in the valley 28 between the ridges 20 and enters. This constant gap communicates with the gas vent passage 18 of the fixed mold 11 and the movable mold 12 via the passage 29 of the gas vent block 13 to form a wave-like gas vent path 30. The other end of the gas vent passage 30 communicates with the end portions of the gas vent blocks 13 and 14 and is released to the atmosphere. In this case, the gas vent passage 30 is preferably formed by slightly widening the gap between the first several uneven portions connected to the passage 29 and slightly narrowing the subsequent gap. This makes it easier to discharge the gas and reliably prevents the molten metal from being ejected.
[0011]
The degassing block 14 has taper portions 32 formed on both side surfaces with the base portion 24a of the wave-like portion constituting member 24 extending toward the lower end portion, and an accommodation space having the same shape as the base portion 24a having the taper portion 32 is formed. An accommodating portion 34 for closely fitting the base portion 24 a is formed in the holding member 26.
[0012]
Further, the portion of the wavy portion constituting member 24 where the concave groove portion 22 that is the wavy portion is formed is provided in a shape that widens opposite to the taper 32 toward the release surface of the concave groove portion 22. This degassing block 14 is composed of two members because the concave groove portion 22 is formed inside the mating surface of the mold of the holding member 26, so that the groove formation of the concave groove portion 22 is easy and inexpensive. For this reason, the corrugated portion constituting member 24 is separated.
[0013]
In the assembly of the die casting mold 10 of this embodiment, the degassing block 13 is fixed to the fixed mold 11 with a bolt (not shown), and the ridge portion 20 is provided in a state protruding from the mating surface of the fixed mold 11. The degassing block 14 provided in the movable mold 12 is first fitted by sliding the base portion 24a of the wave-like portion constituting member 24 from the side in accordance with the accommodating portion 34 of the holding member 26. After the positioning, the waved portion constituting member 24 and the holding member 26 are fixed integrally with a bolt (not shown). Thereafter, the degassing block 14 is fixed to a predetermined position of the movable mold 12. At this time, the recessed groove portion 22 is positioned to face the protruding strip portion 20 of the fixed mold 11.
[0014]
As is well known, in the die casting using the die casting mold 10, the molten metal is jetted from the mold gate to the molding cavity 16 by an injection plunger (not shown), and at this time, the gas in the molding cavity 16 is discharged. Then, after passing through the gas vent passage 18, it escapes to a wave-like gas vent passage 30 formed by the gas vent blocks 13, 14 and is discharged out of the mold. Further, the undulating gas vent passage 30 cools and solidifies the molten metal when it contacts the corrugated portion, thereby preventing flushing of the molten metal.
[0015]
According to the die casting mold 10 of this embodiment, the degassing block 14 is composed of two members, a wave-like member 24 and a holding member, and the base portion 24 a of the wave-like member 24 is accommodated in the holding part 34 of the holding member 26. Since it is positioned by being fitted to, it can be positioned accurately and will not be displaced. In addition, since the taper portion 32 fits into the accommodating portion 34, the taper portion 32 does not come out upward and can be easily fixed in the sliding direction with a pin or the like. Further, the passage portion for the coolant of the degassing block 13 can be easily formed on the holding member 26, and can be easily applied to a gas suction type apparatus. In addition, since the corrugated portion of the gas vent passage 30 is formed in a trapezoidal wave shape or a rectangular corrugated shape with rounded corners, the mold release is good when the product is die-cut, and the molten metal sticks to the gas vent passage 30. There is no.
[0016]
【The invention's effect】
According to this invention, the degassing block is composed of two members, a wave-shaped component member and a holding member, and is fitted and positioned by fitting the base of the wave-shaped component member to the holding portion of the holding member, It can be positioned and fixed accurately. Therefore, there is no displacement of the wavy portion, the molten metal does not enter the gap between the contact portions of the member, and the durability of the mold is increased. In addition, the positioning can be accurately performed by simply fitting the tapered portion of the wave-shaped component member into the holding portion of the holding member, and the attachment strength is high. Furthermore, the gas can be discharged more easily and the molten metal can be reliably prevented from being ejected. Moreover, the mold release of the solidified molten metal is also good by making a wave-like part into the trapezoid wave shape or the rectangular wave shape which rounded the corner.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a die casting die according to a first embodiment of the present invention.
FIG. 2 is a longitudinal sectional view showing a degassing block of a die casting mold according to this embodiment.
FIG. 3 is a plan view showing a male mold of the degassing block of this embodiment.
FIG. 4 is a front view showing a male mold of the degassing block of this embodiment.
FIG. 5 is a plan view showing a female die of the degassing block of this embodiment.
FIG. 6 is a front view showing a female die of the degassing block of this embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Die-casting die 11 Fixed die 12 Movable die 13, 14 Degassing block 16 Molding cavity 18, 30 Degassing passage 20 Convex strip portion 22 Concave groove portion 24 Wave portion constituting member 24a Base portion 26 Holding member 32 Taper portion 34 Containment

Claims

It consists of a pair of molding molds, a fixed mold and a movable mold, and each molding mold is provided with a degassing block that forms a degassing passage communicating with the molding cavity, and each degassing block is mutually connected There are a plurality of opposing wavy portions, and the wavy portions are opposed to each other to form a gap of a predetermined interval, and this gap communicates with the molding cavity as a gas vent passage and is provided on the fixed mold The degassing block is a male type, a plurality of ridges that are wavy portions are formed in parallel with each other at a constant interval, and the other degassing block provided in the movable mold is a female type, The groove-shaped concave groove portion is formed of a wave-shaped component member formed in parallel at regular intervals, and a concave-shaped holding member that accommodates the wave-shaped component member, and the groove portion is at the same pitch as the ridge. Formed and wavy part configuration The base portion of the material is formed with taper portions extending toward the lower end portion on both side surfaces, and an accommodation space having the same shape as the base portion having this taper portion is formed in the holding member of the other degassing block, and the accommodation portion fitting direction of the corrugated part forming element to have a traveling direction of the waves of the corrugated portion, proceeds from the side of the wave of the corrugated portion combined base of the corrugated part forming element in the accommodating portion of the holding member Slid in the direction of fitting, positioning to set the gas vent passage of the gap by the corrugated portion of each degassing block, and fixing the corrugated portion constituting member and the holding member integrally with a bolt The die vent die is characterized in that the gas vent passage is slightly widened by the first wavy portion connected to the cavity side, and the subsequent gap is relatively slightly narrowed.

2. The die casting mold according to claim 1, wherein the corrugated portion is formed in a trapezoidal wave shape or a rectangular wave shape with rounded corners.