JP4775613B2 - Piston die-casting method and die-casting mold - Google Patents
Piston die-casting method and die-casting mold Download PDFInfo
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Description
【０００１】
【発明の属する技術分野】
この発明は、エンジンのシリンダー内で往復動するピストンのダイカスト成形方法とその成形金型に関するものである。
【０００２】
【従来の技術】
近年、自動車、電車、飛行機等の輸送機械に用いる重金属製品類はアルミ化が進められている。その理由として、アルミ製品は軽量で後加工が容易であり、且つリサイクルが容易で省エネに適すること等が挙げられる。しかし、安全性を重視する自動車等に用いる製品のアルミ化には、アルミ合金のダイカスト成形時に発生するガス（キャビティに閉じ込められる空気も含む。）処理を解決する必要がある。その解決手段として、キャビティに連続するガス抜き装置を取付け、ガス抜き装置を介してキャビティ内のガスを吸引装置にて吸引する手段が開発され、一部ダイカスト製品の生産に利用されるに至っている。
【０００３】
【発明が解決しようとする課題】
アルミ合金のダイカスト成形おいて、ガス抜き装置を用いてもガスを完全に抜くことは困難であり、許容範囲内での歩留まりにもバラツキがある等の問題点があった。そのため、アルミダイカスト製品の用途は限られており、過酷な条件下で使用されるエンジンのピストンは、ダイカスト化が不可能と思われていた。
そこでこの発明は、従来技術の有するこのような問題点に鑑みてなされたものであり、その目的とするところは、複数のピストンを一度に、しかも高品質に成形し得るダイカスト成形方法とその成形金型を提供することにある。
【０００４】
【課題を解決するための手段】
上記目的を達成するために、本発明のピストンのダイカスト成形方法は、請求項１として、溶湯をピストンの頭部外周面から圧入し、キャビティ内のガスをピストンの裾部外周面から吸引することを特徴とする。
請求項２として、請求項１のピストンのダイカスト成形方法において、溶湯をピストンの頭部外周面に沿って回転するように圧入すると共に、頭部外周面に対しピストン裾部の側方から傾斜角を持って圧入することを特徴とする。
【０００５】
ここでピストン頭部とは、ピストンの頂部を形成する上部側を言い、頭部外周面とは、ピストン頭部の外周面を言う。
ここでピストン裾部とは、ピストン頭部の下側に連続するスカート状の部位を言い、裾部外周面とは、ピストン裾部の外周面を言う。
ここで溶湯を頭部外周面に沿って回転するように圧入するとは、頭部外周面の両側から、頭部外周面に沿って同一方向に圧入し、溶湯を回転するように誘導することを言い、傾斜角を持って圧入するとは、頭部外周面からピストン頂部方向へ圧入し、ピストン頂部方向へ誘導することを言う。
【０００６】
本発明におけるピストンのダイカスト成形金型は、請求項３として、固定金型と可動金型の間に、複数のキャビティと溶湯供給部とガス抜き部とを備え、キャビティはピストンの頭部頂面を向い合わせに配置しており、溶湯供給部はポートから相対する頭部頂面，間に向けて配置するセンターランナーと、該ランナーからピストンの頭部外周面の一方側に配置する第一分岐ランナーと他方側に配置する第二分岐ランナー、及び両分岐ランナーからピストンの頭部外周面に連続する第一・第二溶湯ゲートとを備え、ガス抜き部はガス抜き装置を介して吸引装置に連続するガス排気路を備え、ガス排気路は裾部外周面の一方側に配置する第一ガス分岐路と、他方側に配置する第二ガス分岐路と、両ガス分岐路からピストンの裾部外周面に連続する第一・第二ガスゲートとを備えていることを特徴とする。
【０００７】
請求項４として、請求項３におけるピストンのダイカスト成形金型において、第一分岐ランナーと第一溶湯ゲートとを、固定金型と可動金型との一方側に、第二分岐ランナーと第二溶湯ゲートとを、固定金型と可動金型との他方側に分けて備え、第一ガス分岐路と第一ガスゲートとを、固定金型と可動金型との一方側に、第二ガス分岐路と第二ガスゲートとを、固定金型と可動金型との他方側に分けて備え、溶湯をピストンの頭部外周面に沿って回転するように圧入し得るようにしたことを特徴とする。
【０００８】
請求項５として、請求項３，４におけるピストンのダイカスト成形金型において、ガス排気路は芯コアの挿入部を避けて設け、第一・第二溶湯ゲートは圧入方向に向けて先細を成すと共に、頭部外周面に対しピストン裾部の側方から傾斜角を持って連続していることを特徴とする。
【０００９】
ダイカスト成形金型において、複数のキャビティとは、２〜１０個のピストンを一度に形成するものを言い、ピストンの頭部頂面を向い合わせに配置するとは、ピストンの中心線をセンターランナーと直交するようにし、且つセンターランナーは挟んで上下対称に配置することを言う。また、第一分岐ランナーと第二分岐ランナーは、固定金型と可動金型に分けて設け、ピストン頭部を中心にして左右対称に配置するものであり、第一溶湯ゲートと第二溶湯ゲートも、固定金型と可動金型に分けて設け、ピストン裾部を中心にして左右対称に配置するものである。
ここで溶湯ゲートが圧入方向に先細を成すとは、楔状にテーパーを成していることを言い、頭部外周面に対しピストン裾部の側方から傾斜角を持ってとは、頭部外周面の上端側に対し、頭部頂面と平行する水平線の斜め下方から傾斜角を有して接続することを言う。
【００１０】
【発明の実施の形態】
先ず、本発明によるピストンのダイカスト成形金型の基本形態を図１に基づき説明すれば、ピストン８のキャビティ１と、キャビティ１への溶湯供給部２と、キャビティ１からのガス抜き部５とを備え、ピストン８は、ピストン頭部１８とピストン裾部２８から成り、溶湯供給部２は、ポート２０からピストン８の頭部頂面８ａより上方の中心部に向けて配置するセンターランナー２２と、該ランナー２２からピストン８の頭部外周面８ｂの一方側に配置する第一分岐ランナー３１と他方側に配置する第二分岐ランナー３２、及び両分岐ランナー３１，３２から頭部外周面８ｂに連続する溶湯ゲート４１，４２とを備え、ガス抜き部５は、ガス排気路５０からピストン８の裾部外周面８ｃの一方側に配置する第一ガス分岐路６１と他方側に配置する第二ガス分岐路６２、及び両ガス分岐路６１，６２から裾部外周面８ｃに連続するガスゲート７１，７２とを備え、ガス排気路５０はガス抜き装置Ｇを介して吸引装置Ｄに連続している。
【００１１】
次に、本発明によるダイカスト成形金型の実施形態を、基本形態と相違する点について説明すれば、図２乃至図７の如く固定金型Ａと可動金型Ｂの間に、４個のピストン８のキャビティ１を、頭部頂面８ａが向い合わせになるように配置し、相対するキャビティ１，１の頭部頂面８ａ，８ａ間に、ポート２０に連続する基幹ランナー２１を設け、基幹ランナー２１から頭部頂面８ａの中心部に向けてセンターランナー２２を配置し、第一分岐ランナー３１と第一溶湯ゲート４１を固定金型Ａ側に、第二分岐ランナー３２と第二溶湯ゲート４２とを可動金型Ｂ側に分けて設け、且つ両溶湯ゲート４１，４２を溶湯の圧入方向に向けて先細のテーパーと成すと共に、頭部外周面８ｂに対しピストン裾部２８の外側から約１０度の傾斜角θを有して連続している。
【００１２】
ガス抜き部５は、芯コアＣの挿入部を避けて設けるガス排気路５０と、該排気路５０からピストン８の裾部外周面８ｃの一方側に配置する第一ガス分岐路６１と他方側に配置する第二ガス分岐路６２、及び両ガス分岐路６１，６２から裾部外周面８ｃに連続するガスゲート７１，７２とを備え、ガス排気路５０にガス抜き装置Ｇに連通するガス抜き路１５を備えており、両ガス分岐路６１，６２とガスゲート７１，７２とガス排気路５０とを固定金型Ａ側に、ガス抜き路１５を可動金型Ｂ側に設けている。
【００１３】
本発明によるピストンのダイカスト成形方法を説明すると、前記成形金型においてポート２０よりキャビティ１に溶湯を充填すると、溶湯ゲート４１，４２が圧入方向に向けて先細のテーパーを成し、しかも頭部外周面８ｂの上端側に対し、頭部頂面８ａと平行する水平線の斜め下方から傾斜角θを持って連続しているので、溶湯は図６（イ）の如くピストン８の頭部外周面８ｂの両側から接線方向に沿って回転するように、しかも図６（ロ）の如く頭部外周面８ｂに対しピストン裾部２８の外側から傾斜角θを有して圧入される。その結果、ピストン頭部１８の隅々まで行き渡り、ピストン頭部１８の均一な形成を可能にする。
一方、ガス抜き部５のガスゲート７１，７２は、図７の如くピストン裾部２８の両側に連続し、ガス抜き装置Ｇを介して吸引装置Ｄに連通しているので、キャビティ１内のガスは順次排出される。しかもガスの吸引によって溶湯がピストン裾部２８まで誘導されるので、ピストン裾部２８の均一な形成をも可能にする。
【００１４】
【実施例】
第一分岐ランナー３１と第一溶湯ゲート４１とを可動金型Ｂ側に、第二分岐ランナー３２と第二溶湯ゲート４２とを固定金型Ａ側に形成しても同様の目的を達成するし、ガス抜き部５を可動金型Ｂ側に形成しても同様の目的を達成する。
ピストン８を４個取り、６個取り、８個取りする場合、基幹ランナー２１をポート２０側より溶湯送り先側に向けて順次小さくし、溶湯圧を均等に供給し得るようにすることが望ましい。
頭部外周面８ｂに対する第一・第二溶湯ゲート４１，４２の連続傾斜角θとして採用し得る範囲は５〜２０度、望ましい範囲は１０〜１５度である。
【００１５】
ガス排気路５０は図８（イ）と図９（イ）の如く、芯コアＣの挿入部を避けて固定金型Ａ側と可動金型Ｂ側との何れか一方側にのみ設ける場合と、図８（ロ）と図９（ロ）の如く固定金型Ａ側と可動金型Ｂ側との両側に跨って設ける場合とがある。
尚、本発明によるピストンのダイカスト成形方法とその成形金型は、上記実施形態に限定されるものではなく、本発明の要旨に反しない限り適宜変更可能である。
【００１６】
【発明の効果】
本発明によるピストンのダイカスト成形方法とその成形装置は上記の通りであるから、次の効果を奏する。
請求項１のダイカスト成形方法と請求項３の成形装置は、ピストン頭部から溶湯を充填し、ピストン裾部からキャビティのガスを吸引するので、キャビティに溶湯が均一に充填され、巣の発生を許容以内に押さえることができる。その結果、過酷な条件下で使用されるピストンでもダイカスト成形が可能になった。ダイカスト製ピストンは、成形や後加工が容易であるばかりか、軽くてリサイクルにも適する。
特に、請求項３の成形装置にあっては、ピストン裾部の両側からガスを吸引しているので、溶湯をピストン裾部まで確実に誘導し得るし、ガスの吸引による溶湯の飛び込みも少なくなる。
【００１７】
請求項２のダイカスト成形方法と請求項４，５の成形装置は、請求項１と請求項３の効果に加えて、溶湯ゲートを圧入方向に先細にすると共に、頭部外周面に対し傾斜角を有して連続しているため、ピストン頭部への溶湯の充填を、頭部外周面に沿って回転するように、しかもピストン頂部に向けて圧入することができる。その結果、溶湯の充填斑が生じにくく、更に均一なピストン頂部の形成が可能となるし、不良品の発生を著しく軽減し、ピストンを安価に提供し得る。
【図面の簡単な説明】
【図１】本発明によるピストンのダイカスト成形方法に用いる成形金型の基本形態を示す平面図である。
【図２】本発明ピストンの４個取り形態を示すダイカスト成形金型の平面図である。
【図３】その底面図である。
【図４】ピストンの４個取り形態における固定金型の平面図である。
【図５】ピストンの４個取り形態における可動金型の平面図である。
【図６】（イ）は第一・第二溶湯ゲートの配置例を示す要部断面図、（ロ）は頭部外周面に対する溶湯ゲートの連続状態を示す要部断面図である。
【図７】ピストン裾部に対する第一・第二ガスゲートの連続例を示す要部断面図である。
【図８】ガス排気路と芯コアとピストンの関係を示す要部側面図で、（イ）はピストンに対する第一分岐ランラーと第一ガス分岐路の連続状態を、（ロ）はピストンに対する第二分岐ランラーと第二ガス分岐路の連続状態を示す。
【図９】（イ）（ロ）ガス排気路の要部側面図である。
【符号の説明】
１ キャビティ
２ 溶湯供給部
２０ ポート、２１ 基幹ランナー、２２ センターランナー
３１ 第一分岐ランナー、３２ 第二分岐ランナー
４１ 第一溶湯ゲート、４２ 第二溶湯ゲート
５ ガス抜き部
１５ ガス抜き路
５０ ガス排気路
６１ 第一ガス分岐路、６２ 第二ガス分岐路
７１ 第一ガスゲート、７２ 第二ガスゲート
８ ピストン、８ａ 頂面、８ｂ 頭部外周面、８ｃ 裾部外周面
１８ ピストン頭部、２８ ピストン裾部
Ａ 固定金型、Ｂ 可動金型
Ｃ 芯コア
Ｄ 吸引装置
Ｇ ガス抜き装置
θ 溶湯ゲートの傾斜角[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a die-cast molding method for a piston that reciprocates in an engine cylinder and a molding die thereof.
[0002]
[Prior art]
In recent years, heavy metal products used in transportation machines such as automobiles, trains and airplanes have been made aluminum. The reason is that aluminum products are lightweight and easy to post-process, are easy to recycle and are suitable for energy saving. However, in order to aluminize products used for automobiles and the like that place importance on safety, it is necessary to solve the treatment of gas (including air confined in the cavity) generated during die casting of an aluminum alloy. As a solution to this problem, a means for attaching a continuous gas venting device to the cavity and sucking the gas in the cavity with the suction device via the gas venting device has been developed and has been partially used for the production of die-cast products. .
[0003]
[Problems to be solved by the invention]
In die casting of an aluminum alloy, it is difficult to completely remove gas even if a gas venting device is used, and there are problems such as variations in yield within an allowable range . For this reason, the applications of aluminum die-cast products are limited, and it has been considered impossible to die-cast engine pistons used under severe conditions.
Therefore, the present invention has been made in view of such problems of the prior art, and the object of the present invention is to provide a die-cast molding method capable of molding a plurality of pistons at once and with high quality and the molding thereof. To provide molds.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, according to a first aspect of the present invention, there is provided a die casting method for a piston, wherein the molten metal is press-fitted from the outer peripheral surface of the head of the piston and the gas in the cavity is sucked from the outer peripheral surface of the bottom of the piston. It is characterized by.
As a second aspect of the present invention, in the die casting method of the piston according to the first aspect, the molten metal is press-fitted so as to rotate along the outer peripheral surface of the head of the piston, and the inclination angle from the side of the piston hem portion with respect to the outer peripheral surface of the head. It is characterized by press fitting.
[0005]
Here, the piston head means the upper side forming the top of the piston, and the head outer peripheral surface means the outer peripheral surface of the piston head.
Here, the piston hem refers to a skirt-like portion continuous below the piston head , and the skirt outer peripheral surface refers to the outer peripheral surface of the piston hem.
Here, the melt is press-fitted so as to rotate along the head outer circumferential surface, from either side of the head outer circumferential surface, and pressed in the same direction along the head outer circumferential surface, that induced to rotate the molten metal say, the press-fitted with an inclination angle, it says that was pressed from the head outer circumferential surface to the piston crown direction, to guide the piston crown direction.
[0006]
According to a third aspect of the present invention, there is provided a die casting mold for a piston comprising a plurality of cavities, a molten metal supply section, and a gas vent section between a fixed mold and a movable mold. are arranged in the opposite alignment, the head top surface melt feed unit is a relative from the port, a center runner arranged toward between a first branch arranged on one side of the head outer circumferential surface of the piston from the runner A runner, a second branch runner arranged on the other side, and first and second molten metal gates continuous from both branch runners to the outer peripheral surface of the piston head , and the gas venting portion is connected to the suction device via the gas venting device. A continuous gas exhaust passage, the gas exhaust passage being disposed on one side of the outer peripheral surface of the bottom portion, the second gas branch passage disposed on the other side, and the bottom portion of the piston from both gas branch passages Contiguous to the outer peripheral surface Characterized in that it comprises a one-second gas gates.
[0007]
According to a fourth aspect of the present invention, in the die casting mold for the piston according to the third aspect, the first branch runner and the first molten metal gate are disposed on one side of the fixed mold and the movable mold, and the second branch runner and the second molten metal are disposed. The gate is separately provided on the other side of the fixed mold and the movable mold, and the first gas branch path and the first gas gate are provided on one side of the fixed mold and the movable mold on the second gas branch path. And the second gas gate are provided separately on the other side of the fixed mold and the movable mold, and the molten metal can be press-fitted so as to rotate along the outer peripheral surface of the head of the piston .
[0008]
As a fifth aspect of the present invention, in the die-casting die of the piston according to the third and fourth aspects, the gas exhaust passage is provided avoiding the insertion portion of the core core, and the first and second molten metal gates are tapered toward the press-fitting direction. Further, it is characterized in that it is continuous with an inclination angle from the side of the piston hem with respect to the outer peripheral surface of the head .
[0009]
In a die-casting mold, a plurality of cavities means that two to ten pistons are formed at once, and the piston center line is orthogonal to the center runner when the piston head top surface is placed facing each other. The center runner is arranged symmetrically with respect to the upper and lower sides. The first branch runner and the second branch runner are provided separately in a fixed mold and a movable mold, and are arranged symmetrically with the piston head as the center. The first molten metal gate and the second molten metal gate Also, the fixed mold and the movable mold are provided separately, and are arranged symmetrically about the piston hem.
Here, when the molten metal gate is tapered in the press-fitting direction, it means that it is tapered in a wedge shape, and having an inclination angle from the side of the piston hem with respect to the outer peripheral surface of the head means that the outer periphery of the head It means to connect to the upper end side of the surface with an inclination angle from obliquely below the horizontal line parallel to the top surface of the head .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
First, a basic configuration of a die-casting die for a piston according to the present invention will be described with reference to FIG. 1. A cavity 1 of a piston 8 , a molten metal supply part 2 to the cavity 1, and a gas vent part 5 from the cavity 1 are provided. The piston 8 is composed of a piston head 18 and a piston skirt 28, and the molten metal supply part 2 is disposed from the port 20 toward the center above the top surface 8a of the piston 8 and a center runner 22; From the runner 22, the first branch runner 31 disposed on one side of the head outer peripheral surface 8 b of the piston 8, the second branch runner 32 disposed on the other side, and the two branch runners 31, 32 are continuous from the head outer peripheral surface 8 b. to a molten metal gate 41, the gas vent portion 5, distribution to one first gas branch passage arranged on the side 61 and the other side of the skirt portion outer peripheral surface 8c of the piston 8 from the gas exhaust path 50 Continuous second gas branch path 62, and from both gas branch passage 61 and a gas gate 71 and 72 continuous to the skirt portion outer peripheral surfaces 8c, the gas exhaust passage 50 to a suction device D via the degasser G for is doing.
[0011]
Next, the embodiment of the die casting mold according to the present invention will be described in terms of differences from the basic form. Four pistons are provided between the fixed mold A and the movable mold B as shown in FIGS. 8 cavities 1 are arranged so that the head top surfaces 8a face each other, and a main runner 21 continuous to the port 20 is provided between the head top surfaces 8a, 8a of the opposite cavities 1 , 1, Center runner 22 is arranged from runner 21 toward the center of head top surface 8a. First branch runner 31 and first molten metal gate 41 are on the fixed mold A side, second branched runner 32 and second molten metal gate are located. 42 are provided separately on the movable mold B side, and both the molten metal gates 41 and 42 are tapered toward the direction of press-fitting the molten metal, and about the head outer peripheral surface 8b from the outside of the piston hem 28. a tilt angle θ of 10 degrees And continue to.
[0012]
The gas vent 5 includes a gas exhaust passage 50 provided so as to avoid the insertion portion of the core C, and a first gas branch passage 61 disposed on one side of the outer peripheral surface 8c of the piston 8 from the exhaust passage 50 and the other side. The second gas branch passage 62 disposed in the gas outlet passage 61, and the gas gates 71 and 72 continuing from the gas branch passages 61 and 62 to the skirt outer peripheral surface 8c , are connected to the gas vent passage G in the gas exhaust passage 50. 15, the gas branch paths 61 and 62, the gas gates 71 and 72, and the gas exhaust path 50 are provided on the fixed mold A side, and the gas vent path 15 is provided on the movable mold B side.
[0013]
The piston die casting method according to the present invention will be described. When the cavity 1 is filled with molten metal from the port 20 in the molding die, the molten metal gates 41 and 42 taper in the press-fitting direction, and the outer periphery of the head to the upper end surface 8b, since the continuously with an inclination angle θ from obliquely below the horizontal line parallel to the head top face 8a, a head outer circumferential surface 8b of the piston 8 as the molten metal 6 (b) In addition, as shown in FIG. 6B, the head outer peripheral surface 8b is press-fitted with an inclination angle θ from the outside of the piston skirt portion 28 so as to rotate along the tangential direction . As a result, it reaches every corner of the piston head 18 and makes it possible to form the piston head 18 uniformly.
On the other hand, the gas gates 71 and 72 of the gas vent 5 are continuous on both sides of the piston skirt 28 as shown in FIG. 7 and communicate with the suction device D through the gas vent G, so that the gas in the cavity 1 is It is discharged sequentially. In addition, since the molten metal is guided to the piston skirt 28 by gas suction, the piston skirt 28 can be formed uniformly.
[0014]
【Example】
Even if the first branch runner 31 and the first molten metal gate 41 are formed on the movable mold B side, and the second branch runner 32 and the second molten metal gate 42 are formed on the fixed mold A side, the same object can be achieved. The same purpose is achieved even if the gas vent 5 is formed on the movable mold B side.
When four, six, and eight pistons 8 are taken, it is desirable that the main runner 21 is gradually reduced from the port 20 side toward the molten metal destination side so that the molten metal pressure can be supplied uniformly.
The range that can be adopted as the continuous inclination angle θ of the first and second molten metal gates 41 and 42 with respect to the head outer peripheral surface 8b is 5 to 20 degrees, and the desirable range is 10 to 15 degrees.
[0015]
As shown in FIGS. 8 (a) and 9 (a), the gas exhaust path 50 is provided only on either the fixed mold A side or the movable mold B side while avoiding the insertion portion of the core core C. 8 (B) and FIG. 9 (B), there is a case where it is provided across both sides of the fixed mold A side and the movable mold B side.
In addition, the die-cast molding method for a piston and the molding die thereof according to the present invention are not limited to the above-described embodiment, and can be appropriately changed as long as they do not contradict the gist of the present invention.
[0016]
【The invention's effect】
Since the piston die casting method and the molding apparatus according to the present invention are as described above, the following effects can be obtained.
In the die-cast molding method of claim 1 and the molding apparatus of claim 3, the molten metal is filled from the piston head and the gas of the cavity is sucked from the bottom of the piston, so that the molten metal is uniformly filled in the cavity and the formation of nests is prevented. It can be held within tolerance. As a result, it has become possible to perform die casting even with pistons used under harsh conditions. Die-cast pistons are not only easy to mold and work, but are light and suitable for recycling.
In particular, in the molding apparatus according to the third aspect, since the gas is sucked from both sides of the piston skirt, the molten metal can be reliably guided to the piston skirt, and the amount of the molten metal jumped by the gas suction is reduced. .
[0017]
Molding apparatus die casting method as claimed in claim 4, 5 according to claim 2, in addition to the effect of claim 1 and claim 3, together with the tapering of the molten metal gates into the press direction, the inclination angle with respect to the head outer circumferential surface due to the continuously a, the filling of the molten metal to the piston head so as to rotate along the head peripheral surface, yet can be pressed toward the piston crown. As a result, it is difficult to cause molten metal filling spots, and it is possible to form a uniform piston top, to significantly reduce the occurrence of defective products, and to provide a piston at low cost.
[Brief description of the drawings]
FIG. 1 is a plan view showing a basic form of a molding die used in a die casting method for a piston according to the present invention.
FIG. 2 is a plan view of a die casting mold showing a four-piece configuration of the piston of the present invention.
FIG. 3 is a bottom view thereof.
FIG. 4 is a plan view of a fixed mold in a four-piston configuration of pistons .
FIG. 5 is a plan view of a movable mold in a four-piston configuration of pistons .
6A is a cross-sectional view of the main part showing an arrangement example of the first and second melt gates, and FIG. 6B is a cross-sectional view of the main part showing a continuous state of the melt gate with respect to the outer peripheral surface of the head .
FIG. 7 is a cross-sectional view of a main part showing a continuous example of first and second gas gates with respect to a piston skirt.
FIG. 8 is a side view of the main part showing the relationship between the gas exhaust passage, the core core, and the piston . FIG. 8A shows the continuous state of the first branch runner and the first gas branch passage with respect to the piston, and FIG. The continuous state of a two-branch runler and a second gas branch is shown.
FIGS. 9A and 9B are side views of essential parts of a gas exhaust path. FIGS.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cavity 2 Molten supply part 20 Port, 21 Core runner, 22 Center runner 31 First branch runner, 32 Second branch runner 41 First melt gate, 42 Second melt gate 5 Gas vent 15 Gas vent 50 Gas exhaust 61 1st gas branch path, 62 2nd gas branch path 71 1st gas gate, 72 2nd gas gate 8 Piston, 8a Top surface, 8b Head outer peripheral surface, 8c Bottom outer peripheral surface 18 Piston head, 28 Piston head A Fixed mold, B Movable mold C Core core D Suction device G Degassing device θ Inclination angle of molten metal gate
Claims (5)
ガス抜き部（５）はガス抜き装置（Ｇ）を介して吸引装置（Ｄ）に連続するガス排気路（５０）を備え、ガス排気路（５０）は裾部外周面（８ｃ）の一方側に配置する第一ガス分岐路（６１）と、他方側に配置する第二ガス分岐路（６２）と、両ガス分岐路（６１），（６２）からピストン（８）の裾部外周面（８ｃ）に連続する第一・第二ガスゲート（７１），（７２）とを備えていることを特徴とするピストンのダイカスト成形金型。Between the fixed mold (A) and the movable mold (B), a plurality of cavities (1), a molten metal supply section (2), and a gas vent section (5) are provided. The cavity (1) is a piston (8). are arranged in alignment opposite the head top surface (8a), the melt feed unit (2) is a head top surface relative from the port (20) (8a), a center runner arranged toward between (8a) (22), a first branch runner (31) disposed on one side of the head outer peripheral surface (8b) of the piston (8) from the runner (22), and a second branch runner (32) disposed on the other side, And first and second molten metal gates (41), (42) continuous from both branch runners (31), (32) to the head outer peripheral surface (8b) of the piston (8),
The gas vent (5) includes a gas exhaust passage (50) that is continuous with the suction device (D) via the gas vent (G), and the gas exhaust passage (50) is on one side of the outer peripheral surface (8c) of the skirt. The first gas branch passage (61) disposed on the second side, the second gas branch passage (62) disposed on the other side, and the outer peripheral surface of the bottom of the piston (8) from both the gas branch passages (61), (62) ( A die-casting die for a piston, comprising first and second gas gates (71), (72) continuing to 8c) .
第一ガス分岐路（６１）と第一ガスゲート（７１）とを、固定金型（Ａ）と可動金型（Ｂ）との一方側に、第二ガス分岐路（６２）と第二ガスゲート（７２）とを、固定金型（Ａ）と可動金型（Ｂ）との他方側に分けて備え、
溶湯をピストン（８）の頭部外周面（８ｂ）に沿って回転するように圧入し得るようにしたことを特徴とする請求項３記載のピストンのダイカスト成形金型。The first branch runner (31) and the first molten metal gate (41) are arranged on one side of the fixed mold (A) and the movable mold (B). 42) are provided separately on the other side of the fixed mold (A) and the movable mold (B),
The first gas branch (61) and the first gas gate (71) are connected to one side of the fixed mold (A) and the movable mold (B), and the second gas branch (62) and the second gas gate ( 72) are provided separately on the other side of the fixed mold (A) and the movable mold (B),
4. The die-cast molding die for a piston according to claim 3, wherein the molten metal can be press-fitted so as to rotate along the outer peripheral surface (8b) of the head of the piston (8) .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001134986A JP4775613B2 (en) | 2001-05-02 | 2001-05-02 | Piston die-casting method and die-casting mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001134986A JP4775613B2 (en) | 2001-05-02 | 2001-05-02 | Piston die-casting method and die-casting mold |
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| Publication Number | Publication Date |
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| JP4775613B2 true JP4775613B2 (en) | 2011-09-21 |
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| JP2001134986A Expired - Fee Related JP4775613B2 (en) | 2001-05-02 | 2001-05-02 | Piston die-casting method and die-casting mold |
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| CN107824749A (en) * | 2017-11-14 | 2018-03-23 | 宁波图冠精密模具有限公司 | A kind of engine cylinder mould |
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| JP4655869B2 (en) * | 2005-10-18 | 2011-03-23 | トヨタ自動車株式会社 | Die casting method |
| JP5701004B2 (en) * | 2010-10-13 | 2015-04-15 | 三菱重工業株式会社 | Die casting mold |
| DE102012107363A1 (en) * | 2011-09-16 | 2013-03-21 | Ksm Castings Group Gmbh | Three-plate die-casting tool with sprue system and sprue system |
| KR101591892B1 (en) | 2015-07-30 | 2016-02-04 | 최정훈 | Casting mold for piston |
| CN216027987U (en) * | 2021-05-14 | 2022-03-15 | 东莞宜安科技股份有限公司 | Die-casting die |
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| JPS61138448A (en) * | 1984-12-11 | 1986-06-25 | Toshiba Corp | Metal halide lamp |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107824749A (en) * | 2017-11-14 | 2018-03-23 | 宁波图冠精密模具有限公司 | A kind of engine cylinder mould |
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