JP5146014B2

JP5146014B2 - Vacuum casting method and vacuum casting mold

Info

Publication number: JP5146014B2
Application number: JP2008053152A
Authority: JP
Inventors: 巖森川
Original assignee: DIEENGINEERING CORP.
Current assignee: DIEENGINEERING CORP.
Priority date: 2008-03-04
Filing date: 2008-03-04
Publication date: 2013-02-20
Anticipated expiration: 2028-03-04
Also published as: JP2009208109A

Description

本発明は、真空装置とガス抜き装置とを使用する真空鋳造方法及び真空鋳造金型に関するもので、特に真空ダイカスト方法と真空ダイカスト金型に関するものである。 The present invention relates to a vacuum casting method and a vacuum casting mold using a vacuum apparatus and a gas venting apparatus, and more particularly to a vacuum die casting method and a vacuum die casting mold.

真空鋳造方法（以下、真空鋳造金型を含む）は、図１０の如く鋳造金型にガス抜き装置を介して真空装置を連続し、鋳造金型のキャビティ内に閉じ込められた空気や、キャビティ内に充填された溶湯から発生するガス等を吸引しながら鋳造するものである。代表的な真空鋳造方法として真空ダイカスト方法が知られており、この真空ダイカスト方法に使用するバルブ式ガス抜き装置として、単バルブ式ガス抜き装置（特公平０７−５１２６６号公報や特開２００２−１７２４５６号公報）と双バルブ式ガス抜き装置（特開２００２−９６１５１号公報や特開２００２−１４４００８号公報）が知られている。
真空鋳造方法にあっては、キャビティ内で溶湯が冷却個化して製品となる一方、キャビティからガス抜き溝を介してガス抜き装置に達した溶湯も冷却個化し、切捨部材として製品と一体化している。この一体化した製品と切捨部材は、鋳造金型を型開きして、一度に同時に取出すものである。 A vacuum casting method (hereinafter, including a vacuum casting mold) is performed by connecting a vacuum apparatus to a casting mold through a gas venting device as shown in FIG. The casting is performed while sucking the gas generated from the molten metal filled in the container. A vacuum die casting method is known as a typical vacuum casting method. As a valve type gas venting device used in this vacuum die casting method, a single valve type gas venting device (Japanese Patent Publication No. 07-51266 and Japanese Patent Application Laid-Open No. 2002-172456) is known. And a double-valve degassing apparatus (Japanese Patent Laid-Open No. 2002-96151 and Japanese Patent Laid-Open No. 2002-144008) are known.
In the vacuum casting method, the molten metal is cooled and individualized in the cavity to become a product, while the molten metal that has reached the gas venting device from the cavity via the gas venting groove is also cooled and individualized, and integrated with the product as a cutting member. ing. The integrated product and the cut-off member are to be taken out at the same time by opening the casting mold.

双バルブ式ガス抜き装置は図６の如く、鋳造金型のガス抜き溝に連続する溶湯路１３と、溶湯路１３に侵入した溶湯圧にて作動する受圧バルブ１４（ピストンとも称する）と、真空装置への溶湯の流出を阻止する閉鎖バルブ１６と、受圧バルブの作動を閉鎖バルブに伝えるレバー１５とを備えている。
また、キャビティとガス抜き装置との間に設けるガス抜き溝は、特開２００２−１４４００９号公報や特開２００３−１７０４７９号公報の如く、キャビティより外側に配置するガス抜きガイド路に、ガス抜き装置に連続するガス抜きブリッジと、キャビティに連続するガス抜きゲートとを備え、ガス抜きブリッジとガス抜きゲートとの夫々を、ガス抜きガイド路の長手方向に直交して設けていた。 As shown in FIG. 6, the double-valve degassing device includes a molten metal passage 13 that continues to a degassing groove of a casting mold, a pressure receiving valve 14 (also referred to as a piston) that operates with a molten metal pressure that has entered the molten metal passage 13, and a vacuum. A closing valve 16 for preventing the molten metal from flowing out to the apparatus and a lever 15 for transmitting the operation of the pressure receiving valve to the closing valve are provided.
Further, a gas vent groove provided between the cavity and the gas venting device is provided in a gas vent guide path disposed outside the cavity as disclosed in JP 2002-144209 A and JP 2003-170479 A. The degassing bridge and the degassing gate continuing to the cavity are provided, and each of the degassing bridge and the degassing gate is provided orthogonal to the longitudinal direction of the degassing guide path.

特公平０７−５１２６６号公報Japanese Patent Publication No. 07-51266 特開２００２−１７２４５６号公報JP 2002-172456 A 特開２００２−９６１５１号公報JP 2002-96151 A 特開２００２−１４４００８号公報JP 2002-144008 A 特開２００２−１４４００９号公報JP 2002-144209 A 特開２００３−１７０４７９号公報JP 2003-170479 A

従来のバルブ式ガス抜き装置、特に双バルブ式ガス抜き装置を用いる真空鋳造方法と真空鋳造金型では、バルブの目詰まりが発生し、生産性を低下させることがあった。その原因の多くは、バルブを構成するシリンダーとバルブピストンのクリアランスにあるが、クリアランスを適正にし、更にバルブの作動調整をしても、バルブの目詰まりを発生することがあった。発明者は新たな原因として、図１１の如くキャビティ３からガス抜きゲート６を経由してガス抜きガイド路５に流入する溶湯が、ガス抜きガイド路５で左右に飛散（分流）し、一方向に飛散した溶湯がガス抜き溝４からガス抜き装置に侵入する。この時、ガス抜き装置においては、真空吸入が行われている為、ガス抜き装置に侵入した溶湯が脈動し、それによりバルブの衝撃荷重も変動したり、シリンダーとバルブピストンのクリアランス内に流入したりすることを想定した。
また、キャビティに充填される溶湯に溶湯滓（以下、溶湯粒を含む）が混在していたり、キャビティに充填された溶湯から溶湯滓が発生し、その溶湯滓が溶湯より先に吸引されることも想定した。 In conventional vacuum casting methods and vacuum casting dies using a valve-type gas venting device, particularly a double-valve type gas venting device, valve clogging may occur and productivity may be reduced. Most of the causes lie in the clearance between the cylinder constituting the valve and the valve piston. However, even when the clearance is made appropriate and the operation of the valve is adjusted, the valve may be clogged. As a new cause, the inventor, as shown in FIG. 11, the molten metal flowing from the cavity 3 through the gas vent gate 6 into the gas vent guide path 5 scatters (divides) left and right in the gas vent guide path 5 and is unidirectional. The molten metal scattered on the gas enters the gas venting device through the gas vent groove 4. At this time, since the vacuum venting is performed in the gas venting device, the molten metal that has entered the gas venting device pulsates, thereby changing the impact load of the valve or flowing into the clearance between the cylinder and the valve piston. It was assumed that
Also, the molten metal filled in the cavity is mixed with molten metal (hereinafter, including molten particles), or molten metal is generated from the molten metal filled in the cavity, and the molten metal is sucked before the molten metal. Also assumed.

鋳造金型を型開きして、製品を取出す際、製品と一体化している図１２の如く切捨部材Ｅも同時に取出されるが、切捨部材は非製品であるため、可能な限り細く薄く形成されるため、時々切捨部材ｅの曲がり角で折損し、一部が金型内に残り、再度、取出さなければならない不都合もあった。
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、今まで見落とされていたガス抜き溝に注目し、特にガス抜き溝のガス抜き路とガス抜きゲートの配置に工夫を凝らすことにより、バルブの目詰りを減少し、生産性を向上することに成功し、その真空鋳造方法と真空鋳造金型を提供するものである。 When the casting mold is opened and the product is taken out, the cut-out member E integrated with the product is also taken out at the same time, but the cut-off member is a non-product, so it is as thin and thin as possible. Since it is formed, it sometimes breaks at the corner of the cut-off member e, a part remains in the mold, and there is a disadvantage that it must be taken out again.
Accordingly, the present invention has been made in view of such problems of the prior art, and pays attention to the gas vent groove that has been overlooked so far, and in particular, the arrangement of the gas vent path and the gas vent gate of the gas vent groove. By devising the idea, it succeeds in reducing the clogging of the valve and improving the productivity, and provides a vacuum casting method and a vacuum casting mold.

上記目的を達成するために、本発明の真空鋳造方法は、請求項１として、バルブ式ガス抜き装置を取りつけた真空鋳造金型において、キャビティよりバルブ式ガス抜き装置に向けて設けるガス抜き溝を、キャビティより外側に配置するガス抜きガイド路と、キャビティよりガス抜きガイド路に連続するガス抜きゲートと、ガス抜きガイド路よりガス抜き装置に連続するガス抜きブリッジ路とから構成し、バルブ式ガス抜き装置が、少なくともガス抜きブリッジ路に連通する溶湯路と、溶湯路に向けて往復動する受圧バルブと閉鎖バルブ、及び受圧バルブの動きを閉鎖バルブに伝達するレバーとを備えた双バルブ式ガス抜き装置であり、ガス抜きゲートをガス抜きガイド路におけるガス流動方向に対して逆向きのゲート連続角度で連続し、そのゲート連続角度を最良範囲４０〜５０度にすることでガス抜き装置におけるバルブの目詰まりを少なくし得るようにしたことを特徴とする。 In order to achieve the above object, a vacuum casting method according to the present invention includes, as claimed in claim 1, a vacuum casting mold having a valve-type gas venting device provided with a gas vent groove provided from the cavity toward the valve-type gas venting device. The valve-type gas is composed of a gas vent guide path arranged outside the cavity, a gas vent gate continuing from the cavity to the gas vent guide path, and a gas vent bridge path continuing from the gas vent guide path to the gas vent device. A double valve gas in which the venting device includes at least a molten metal path communicating with the gas venting bridge path, a pressure receiving valve and a closing valve that reciprocate toward the molten metal path, and a lever that transmits the movement of the pressure receiving valve to the closing valve. a vent device, and continuous gate continuous angle opposite the degassing gate relative gas flow direction in the gas vent guide path, the Characterized in that the over preparative continuous angle adapted to reduce clogging of the valve in the degassing apparatus by the best range 40 to 50 degrees.

ここで真空鋳造方法とは、鋳造金型の型締め時にキャビティ内に閉じ込められた空気、型締め状態においてキャビティ内に充填される溶湯、及び充填された溶湯から発生する溶湯ガス等（以下、これらをガスとする）を真空装置にて吸引しながら鋳造する方法を言う。
ここでバルブ式ガス抜き装置とは、一個のバルブを電気式センサーにて開閉する単バルブ式ガス抜き装置と、レバーを介して受圧バルブ（ピストンとも称する）の動きを開閉バルブに伝える双バルブ式ガス抜き装置とを言う。
ここでガス抜き溝とは、キャビティ内のガスを吸引して排出するための溝を言い、ガス抜きガイド路とは、キャビティより少し離れた外側に設ける溝を言い、ガス抜きゲートとは、キャビティとメーン路との間に設ける溝を言い、ガス抜きブリッジ路とは、メーン路とガス抜き装置との間に設ける溝を言う。
ここでガス流動方向とは、ガス抜き溝内を流れる溶湯ガス（キャビティに閉じ込められた空気、溶湯滓を含む）の方向、即ち、吸引方向に沿った流れを言う。
逆向きのゲート連続角度とは、キャビティからガス抜きガイド路に流出した溶湯を、ガス抜きゲートによりガス流動方向に対し逆方向に流出させる角度を言い、そのことにより、密度の高い溶湯を、ガス抜き装置の溶湯路に流出させ、ピストンに衝撃荷重を発生させ、確実にバルブを閉鎖し、バルブの目詰まりを防止して、生産性を向上する。ゲート連続角度は、実験によって総てを導き出したものではないが、最良範囲は４０〜５０度であると思われる。３０度以下になると溶湯の流れが悪くなり、６０度以上になると従来と同様になると思われる。 Here, the vacuum casting method refers to air confined in the cavity during mold clamping of the casting mold, molten metal filled in the cavity in the mold clamping state, molten gas generated from the filled molten metal, etc. And gas) are sucked with a vacuum device.
Here, the valve type gas venting device is a single valve type gas venting device that opens and closes one valve with an electric sensor, and a double valve type that transmits the movement of a pressure receiving valve (also referred to as a piston) to the opening / closing valve via a lever. A degassing device.
Here, the gas vent groove refers to a groove for sucking and discharging the gas in the cavity, the gas vent guide path refers to a groove provided slightly outside the cavity, and the gas vent gate refers to the cavity. And a gas vent bridge path refers to a groove provided between the main path and the gas venting device.
Here, the gas flow direction refers to the flow along the direction of the molten gas (including air confined in the cavity and molten metal) flowing in the gas vent groove, that is, the suction direction.
The reverse gate continuous angle refers to the angle at which the molten metal that has flowed out of the cavity into the degassing guide path is caused to flow out in the opposite direction to the gas flow direction by the degassing gate. It flows out to the molten metal path of the punching device, generates an impact load on the piston, reliably closes the valve, prevents clogging of the valve, and improves productivity. The gate continuity angle is not all derived by experiment, but the best range seems to be 40-50 degrees. If it is 30 degrees or less, the flow of the molten metal will be poor, and if it is 60 degrees or more, it will be the same as the conventional one.

また、本発明の真空鋳造金型は、請求項２として、バルブ式ガス抜き装置を取りつけた真空鋳造金型において、キャビティよりバルブ式ガス抜き装置に向けて設けるガス抜き溝を、キャビティより外側に配置するガス抜きガイド路と、キャビティよりガス抜きガイド路に連続するガス抜きゲートと、ガス抜きガイド路よりガス抜き装置に連続するガス抜きブリッジ路とから構成し、バルブ式ガス抜き装置が、少なくともガス抜きブリッジ路に連通する溶湯路と、溶湯路に向けて往復動する受圧バルブと閉鎖バルブ、及び受圧バルブの動きを閉鎖バルブに伝達するレバーとを備えた双バルブ式ガス抜き装置であり、ガス抜きゲートをガス抜きガイド路におけるガス流動方向に対して最良範囲４０〜５０度逆向きのゲート連続角度で連続し、ガス抜き装置におけるバルブの目詰まりを少なくし得るようにしたことを特徴とする。
請求項３は、請求項２記載の真空鋳造金型において、ガス抜きガイド路が、ガス抜きブリッジ路に直交する横ガイド部と、横ガイド部の先部に交差連続する縦ガイド部とから成り、両ガイド部の交差部に、縦ガイド部の延長方向に延設するガイド突出部を備えていることを特徴とする。
請求項４は、請求項２記載の真空鋳造金型において、ガス抜きガイド路が、ガス抜きブリッジ路に直交する横ガイド部の先端部に、横ガイド部と交差角度で連続するガイド傾斜部を備え、そのガイド傾斜部の端部に縦ガイド部を連続していることを特徴とする。
請求項５は、請求項４記載の真空鋳造金型において、横ガイド部とガイド傾斜部の交差角度が６０〜８９度の鋭角であることを特徴とする。 According to a second aspect of the present invention, there is provided a vacuum casting mold according to claim 2 , wherein in the vacuum casting mold having a valve type gas venting device, a gas vent groove provided from the cavity toward the valve type gas venting device is provided outside the cavity. a degassing guide path to place a degassing gate continuous to degassing guide path from the cavity, and composed of a gas vent bridge path continuous with degasser the gas vent guide path, the valve-type venting device comprises at least A double valve type gas venting device comprising a molten metal channel communicating with the degassing bridge channel, a pressure receiving valve that reciprocates toward the molten metal channel and a closing valve, and a lever that transmits the movement of the pressure receiving valve to the closing valve; degassing gate contiguous with the gate successive angular best range 40 to 50 degrees opposite to that gas flow direction in the gas vent guide path, gas Characterized by being adapted to reduce clogging of the valve in the exhaust device.
According to a third aspect of the present invention, in the vacuum casting mold according to the second aspect , the degassing guide path includes a horizontal guide part orthogonal to the degassing bridge path and a vertical guide part intersecting and continuous with the front part of the horizontal guide part. A guide protrusion that extends in the extending direction of the vertical guide portion is provided at the intersection of the two guide portions.
According to a fourth aspect of the present invention, in the vacuum casting mold according to the second aspect , a guide inclined portion in which the degassing guide path is continuous at a crossing angle with the horizontal guide portion at a tip portion of the horizontal guide portion orthogonal to the degassing bridge path And a longitudinal guide portion is continuous with an end portion of the guide inclined portion .
According to a fifth aspect of the present invention, in the vacuum casting mold according to the fourth aspect , the crossing angle between the lateral guide portion and the guide inclined portion is an acute angle of 60 to 89 degrees.

ここでガイド突出部とは、ガス抜きガイド路の曲がり角、即ち、横ガイド部と縦ガイド部との交差部に設けるもので、主に曲がり角を補強するものである。
ここで交差角度とは、ガス抜きガイド路の曲がり角、即ち、横ガイド部とガイド傾斜部との交差部を言い、交差角度を鋭角にすることで主に曲がり角を補強するものである。交差角度は、度実験によって総てを導き出したものではないが、採用し得る範囲は６０〜８９度であると思われる。６０度以下になると溶湯の流れが悪くなり、８５度以上になると従来と同様になると思われる。 Here, the guide protruding portion is provided at the corner of the gas vent guide path, that is, at the intersection of the horizontal guide portion and the vertical guide portion, and mainly reinforces the corner.
Here, the intersection angle refers to a corner of the gas vent guide path, that is, an intersection between the lateral guide portion and the guide inclined portion, and the corner is mainly reinforced by making the intersection angle an acute angle. The crossing angles are not all derived by degree experiments, but the range that can be adopted seems to be 60-89 degrees. If it is 60 degrees or less, the flow of the molten metal will be poor, and if it is 85 degrees or more, it will be the same as the conventional one.

本発明による真空鋳造方法は上記のとおりであるから、次に記載する効果を奏する。
請求項１の真空鋳造方法は、ガス抜き溝を形成するガス抜きゲートを、ガス抜きガイド路におけるガス流動方向に対して逆向きのゲート連続角度で設けたことにより、溶湯によるバルブの目詰まりが少なくなり、生産性が向上した。
その原因は正確に解明されていないが、ガス抜きゲートをガス流動方向に対して４５度逆向きのゲート連続角度で設けたことによると思われる。即ち、キャビティからガス抜きゲートを介してガス抜きガイド路に流入する溶湯に脈動を生じないためとも思われる。
また、ガスの通過は、ガス抜き溝の形状（ガス抜きゲートの逆向き角度）に影響を受けることはほとんどないが、粘性を有する溶湯は、順方向には滑らかに通過するも、急激な方向転換（逆向きに流れにくい）が困難なこと等が考えられる。その結果、ガス抜き溝に密度の高い溶湯が流れ、その溶湯がガス抜き装置の溶湯路に流入して衝撃荷重でバルブを作動するため、バルブの目詰まりを防止し得るものと思われる。
ガス抜き溝（ガス抜きブリッジ、ガス抜きガイド路、ガス抜きゲート）は、一般に、ガスや溶湯がスムーズに流れるようガス流動方向に向け、即ち、ガス流動方向の順方向に設けるが、本発明では溶湯が逆方向に流入し得るようにした。 Since the vacuum casting method according to the present invention is as described above, the following effects can be obtained.
In the vacuum casting method according to claim 1 , the gas vent gate for forming the gas vent groove is provided at a gate continuous angle opposite to the gas flow direction in the gas vent guide path, so that the valve is clogged by the molten metal. Reduced productivity.
The reason for this is not exactly understood, but it is thought that the degassing gate is provided at a continuous gate angle of 45 degrees opposite to the gas flow direction. That is, it is also considered that pulsation does not occur in the molten metal flowing from the cavity to the gas vent guide path through the gas vent gate.
In addition, the passage of gas is hardly affected by the shape of the gas vent groove (the reverse angle of the gas vent gate), but the viscous molten metal passes smoothly in the forward direction, but in a sharp direction. It may be difficult to switch (it is difficult to flow in the opposite direction). As a result, a molten metal having a high density flows into the gas vent groove, and the melt flows into the melt path of the gas venting device to operate the valve with an impact load. Therefore, it seems that the valve can be prevented from being clogged.
The gas vent groove (gas vent bridge, gas vent guide path, gas vent gate) is generally provided in the gas flow direction so that the gas or molten metal flows smoothly, that is, in the forward direction of the gas flow direction. The molten metal was allowed to flow in the reverse direction.

また、本発明の真空鋳造金型は上記のとおりであるから、次に記載する効果を奏する。
請求項２の真空鋳造金型は、ガス抜き溝のガス抜きゲートを、ガス流動方向に対して４０〜５０度逆向きのゲート連続角度で連続するので、上記真空鋳造方法と同様の効果が得られる。更に、ガス抜きゲートを逆向きに連続するだけであるから、金型の加工に、特別な加工手段や加工工具を必要としない利点もある。
請求項３の真空鋳造金型は、請求項２記載の特徴に加えて、ガス抜きガイド路を形成する横ガイド部と縦ガイド部の交差部に、縦ガイド部のガス流動方向側に延長するガイド突出部を備えているので、ガス抜きガイド路で冷却個化した切捨部材の曲がり角が補強される。その結果、切捨部材の取出し時に折損が少なくなる。また、縦ガイド部の延長側にガイド突出部を備えているので、キャビティより縦ガイド部に先に飛び込む溶湯粒（溶湯カス）等をガイド突出部に止めることができる。その結果、溶湯粒等によるバルブの目詰まりを防止することができる。
請求項４、５の真空鋳造金型は、請求項２記載の特徴に加えて、ガス抜きガイド路を形成する横ガイド部とガイド傾斜部との交差角度が鋭角を成すので、ガス抜きガイド路で冷却個化した切捨部材の交差部が補強される。その結果、切捨部材の取出し時に折損が少なくなる。また、その交差部で溶湯からガスや溶湯粒（溶湯カス）等が分離され、純度の高い溶湯（一段と密度の高い溶湯）がガス抜き装置に流し得るものと思われる。 Moreover, since the vacuum casting mold of this invention is as above-mentioned, there exists an effect described below.
The vacuum casting mold according to claim 2 has the same effect as the vacuum casting method because the gas vent gate of the gas vent groove is continuous at a gate continuous angle of 40 to 50 degrees opposite to the gas flow direction. It is done. Furthermore, since the degassing gate is simply continued in the reverse direction, there is an advantage that no special processing means or processing tool is required for processing the mold.
In addition to the features of claim 2 , the vacuum casting mold according to claim 3 extends to the gas flow direction side of the vertical guide portion at the intersection of the horizontal guide portion and the vertical guide portion forming the gas vent guide path. Since the guide protrusion is provided, the bending angle of the cut-off member cooled and separated in the gas vent guide path is reinforced. As a result, the breakage is reduced when the cut-off member is taken out. Moreover, since the guide protrusion part is provided in the extension side of the vertical guide part, the molten particle (molten waste) etc. which jumps into a vertical guide part previously from a cavity can be stopped by a guide protrusion part. As a result, the clogging of the valve due to molten metal particles can be prevented.
In addition to the features of claim 2 , the vacuum casting mold of claims 4 and 5 is characterized in that the crossing angle between the lateral guide part and the guide inclined part forming the gas vent guide path forms an acute angle. The crossing part of the cut-off member that has been cooled and separated in step 1 is reinforced. As a result, the breakage is reduced when the cut-off member is taken out. In addition, it is considered that gas, molten particles (molten waste) and the like are separated from the molten metal at the intersection, and a molten metal with higher purity (a molten metal with higher density) can flow to the degasser.

本発明に係わる真空鋳造方法と真空鋳造金型の最良形態を示す概略図である。It is the schematic which shows the best form of the vacuum casting method and vacuum casting metal mold | die concerning this invention. 本発明の真空鋳造金型に用いる固定金型の平面図である。It is a top view of the fixed metal mold | die used for the vacuum casting metal mold | die of this invention. 同、真空鋳造金型に用いる可動金型の平面図である。It is a top view of the movable metal mold | die used for a vacuum casting metal mold | die similarly. 図２−２のＸ部を中心とする拡大図で、横ガイド部のガス流動方向と溶湯流動方向を示す。It is an enlarged view centering on the X section of FIG. 2-2, and shows the gas flow direction and molten metal flow direction of a horizontal guide part. 縦ガイド部のガス流動方向と溶湯流動方向を示す要部拡大図である。It is a principal part enlarged view which shows the gas flow direction and molten metal flow direction of a vertical guide part. ガス抜きガイド路の第一実施例を示す要部平面図である。It is a principal part top view which shows the 1st Example of a degassing guide path. ガス抜きガイド路の第二実施例を示す要部平面図である。It is a principal part top view which shows the 2nd Example of a degassing guide path. 双バルブ式ガス抜き装置の断面図である。It is sectional drawing of a double valve type degassing apparatus. ガス抜き溝の形成例を示す可動金型の平面図である。It is a top view of the movable metal mold | die which shows the example of formation of a gas vent groove. 単バルブ式ガス抜き装置を用いた真空鋳造金型の断面図である。It is sectional drawing of the vacuum casting metal mold | die using a single valve type gas venting apparatus. チルベント式ガス抜き装置を用いた真空鋳造金型の可動金型側平面図である。It is a movable metal mold | die side top view of the vacuum casting metal mold | die using a chill vent type gas venting apparatus. 従来真空鋳造金型における可動金型側の概略図である。It is the schematic on the movable mold side in the conventional vacuum casting mold . 図１０のＺ部を中心とする拡大図である。It is an enlarged view centering on the Z section of FIG. 切捨部材の平面図である。It is a top view of a cutoff member.

本発明による真空鋳造方法と真空鋳造金型を図１乃至図３に基づき説明すれば、真空鋳造金型として真空ダイカスト金型Ｄを、バルブ式ガス抜き装置Ｖとして双バルブ式ガス抜き装置１０（以下、ガス抜き装置１０と略す）を用い、ガス抜き装置１０より真空装置Ｓに吸入ホースＨを連続するものであり、真空ダイカスト金型Ｄは、固定金型２１と可動金型２２との間にキャビティ３と、キャビティ３よりガス抜き装置１０に連続するガス抜き溝４とを備え、且つ、キャビティ３に湯口ランナー２５を介して湯口２６に連続しており、双バルブ式ガス抜き装置１０は図６の如く、固定金型２１に取付ける固定型１１と、可動金型２２に取付ける可動型１２との接合部に、真空ダイカスト金型Ｄのガス抜き溝４に連通する溶湯路１３を備え、固定型２１に溶湯路１３に向けて往復動する受圧バルブ１４と閉鎖バルブ１６、及び受圧バルブ１４の動きを閉鎖バルブ１６に伝達するレバー１５と、レバー１５の揺動を規制する固定プレート１７とを備えている。 A vacuum casting method and a vacuum casting mold according to the present invention will be described with reference to FIGS. 1 to 3. A vacuum die casting mold D is used as a vacuum casting mold, and a double valve type gas venting apparatus 10 ( (Hereinafter abbreviated as “gas venting device 10”), the suction hose H is continued from the gas venting device 10 to the vacuum device S, and the vacuum die casting mold D is located between the fixed mold 21 and the movable mold 22. Are provided with a cavity 3 and a gas vent groove 4 that continues from the cavity 3 to the gas venting device 10, and continues to the gate 26 via the gate runner 25 in the cavity 3. As shown in FIG. 6, a molten metal passage 13 communicating with the gas vent groove 4 of the vacuum die casting mold D is provided at a joint portion between the fixed mold 11 attached to the fixed mold 21 and the movable mold 12 attached to the movable mold 22. Solid A pressure receiving valve 14 and a closing valve 16 that reciprocate toward the molten metal path 13 in the mold 21, a lever 15 that transmits the movement of the pressure receiving valve 14 to the closing valve 16, and a fixed plate 17 that restricts the swing of the lever 15. I have.

真空ダイカスト金型Ｄのガス抜き溝４は図２−２の如く、キャビティ３より少し離れた外側に形成するガス抜きガイド路５と、キャビティ３よりガス抜きガイド路５に連続するガス抜きゲート６と、ガス抜きガイド路５よりガス抜き装置１０に連続するガス抜きブリッジ７とから成り、ガス抜きガイド路５が、ガス抜きブリッジ７に直交する横ガイド部５ａと、該ガイド部５ａの先部に交差連続する縦ガイド部５ｂとから成り、図３−１と図３−２の如く横ガイド部５ａとキャビティ３の間、及び縦ガイド部５ｂとキャビティ３の間に各々ガス抜きゲート６をゲート連続角度αで設け、このゲート連続角度αが横ガイド部５ａ及び縦ガイド部５ｂにおけるガス流動方向Ｇに対して４５度逆向きに形成する。 As shown in FIG. 2B, the gas vent groove 4 of the vacuum die casting mold D includes a gas vent guide path 5 formed on the outer side slightly away from the cavity 3, and a gas vent gate 6 continuous from the cavity 3 to the gas vent guide path 5. And a degassing bridge 7 continuing from the degassing guide path 5 to the degassing device 10 , and the degassing guide path 5 includes a lateral guide portion 5 a orthogonal to the degassing bridge 7, and a tip portion of the guide portion 5 a. , And a degassing gate 6 between the horizontal guide 5a and the cavity 3 and between the vertical guide 5b and the cavity 3, respectively, as shown in FIGS. 3-1 and 3-2. A gate continuous angle α is provided, and the gate continuous angle α is formed to be 45 degrees opposite to the gas flow direction G in the horizontal guide portion 5a and the vertical guide portion 5b.

（実験例１）
鋳造機＝東芝ダイカストマシンＤＣ１３５Ｊ−Ｓ（東芝機械株式会社）
型閉力＝１３５０（１３８）ｋＮ（ｔｏｎ）
射出速度＝０．０５〜６．０ｍ／ｓｅｃ
タイバー開閉（タテ×ヨコ）＝４６０×４６０ｍｍ
金型厚さ＝５００〜２５０ｍｍ
ダイストローク＝３５０ｍｍ
真空装置Ｓ＝ＤＩＥＶＳ４０−ＳＵＭ９（弊社製品）
双バルブ式ガス抜き装置１０＝ＮＶＶ（弊社製品） (Experimental example 1)
Casting machine = Toshiba Die Casting Machine DC135J-S (Toshiba Machine Co., Ltd.)
Mold closing force = 1350 (138) kN (ton)
Injection speed = 0.05-6.0 m / sec
Tie bar opening / closing (vertical x horizontal) = 460 x 460mm
Mold thickness = 500-250mm
Die stroke = 350mm
Vacuum device S = DIEVS40-SUM9 (our product)
Double valve type gas venting device 10 = NVV (our product)

本発明の真空鋳造金型＝図２−１と図２−２の通り。
キャビティ３＝矩形
ガス抜きガイド路５の路幅＝１１・５ｍｍ、路深さ＝６〜７ｍｍ
ガス抜きブリッジ７の路幅＝１１・５ｍｍ、路深さ＝１１・５ｍｍ
ゲート連続角度α＝４５度逆向き
対照鋳造金型＝図１０の通り。
ガス抜きゲート６の連続状態以外は本発明の真空鋳造金型Ｄと同じ。 Vacuum casting mold of the present invention = as shown in FIGS. 2-1 and 2-2.
Cavity 3 = rectangular Degassing guide path 5 width = 11.5 mm, path depth = 6-7 mm
Road width of degassing bridge 7 = 11.5mm, road depth = 11.5mm
Gate continuous angle α = 45 degrees opposite direction Control casting mold = as shown in FIG.
Except for the continuous state of the gas vent gate 6, it is the same as the vacuum casting mold D of the present invention.

本発明による真空鋳造方法と真空鋳造金型を用いてアルミ製品を鋳造する場合、先ず、真空鋳造金型Ｄの固定金型２１と可動金型２２を型閉めし、両金型２１，２２の間にキャビティ３を形成した後、湯口２６よりキャビティ３に溶湯を流し込む。
真空鋳造金型Ｄの型閉めと同時に、望ましくは溶湯を流し込む直前から真空装置Ｓを作動し、キャビティ３に流し込まれた溶湯から発生するガスを吸引する。その際、キャビティ３内に閉じ込められた空気も同時に吸引されるので、以後、ガスには空気も含まれものとする。
真空装置Ｓにより吸引されるガスは、キャビティ３よりガス抜きゲート６、ガス抜きガイド路５、ガス抜きブリッジ７、ガス抜き装置１０の溶湯路１３を順に通り、真空装置Ｓに吸引される。このガスの吸引に伴い、溶湯もガス抜きゲート６、ガス抜きガイド路５、ガス抜きブリッジ７を順に通り、ガス抜き装置１０の溶湯路１３に達し、先ず受圧バルブ１４を作動し、次いで閉鎖バルブ１６を作動する。
この手順は対照鋳造金型を用いた場合も同様である。 When an aluminum product is cast using the vacuum casting method and vacuum casting mold according to the present invention, first, the fixed mold 21 and the movable mold 22 of the vacuum casting mold D are closed, and both the molds 21 and 22 are closed. After the cavity 3 is formed therebetween, the molten metal is poured into the cavity 3 from the gate 26.
Simultaneously with the closing of the vacuum casting mold D, the vacuum device S is operated immediately before the molten metal is poured, and the gas generated from the molten metal poured into the cavity 3 is sucked. At that time, since the air confined in the cavity 3 is also sucked at the same time, it is assumed that the gas includes air.
The gas sucked by the vacuum device S is sucked by the vacuum device S from the cavity 3 through the gas vent gate 6, the gas vent guide path 5, the gas vent bridge 7, and the molten metal path 13 of the gas vent device 10 in order. As the gas is sucked, the molten metal also passes through the degassing gate 6, the degassing guide path 5, and the degassing bridge 7 in this order, and reaches the molten metal path 13 of the degassing device 10, firstly operating the pressure receiving valve 14, and then the closing valve. 16 is activated.
This procedure is the same when the control casting mold is used.

対照鋳造金型では、５００ショットで１回程度、ガス抜き装置１０においてバルブの目詰まりを生じたが、本発明による真空鋳造方法と真空鋳造金型では、３０００ショットでもガス抜き装置１０はバルブの目詰まりを発生しなかった。その原因は正確に解明されていないが、本発明の真空鋳造金型Ｄにおいて、ガス抜きゲート６を横ガイド部５ａ及び縦ガイド部５ｂにおけるガス流動方向Ｇに対して４５度逆向きのゲート連続角度αで設けたことによると思われる。即ち、キャビティ３からガス抜きゲート６を介してガス抜きガイド路５に流入する溶湯に脈動を生じないためとも思われる。
また、ガス抜きゲート６から縦ガイド部５ｂに流入するガスは流動性に優れているので、ゲート連続角度αが４５度逆向きであっても素早くガス流動方向Ｇに方向転換し得るも、溶湯は粘性を有しているため、ガス抜きゲート６の連続方向、即ち、縦ガイド部５ｂを流れるガス流動方向Ｇと逆向きに一旦流入し、その後、方向転換してガス流動方向Ｇに流れる。その結果、ガスが溶湯から分離し、密度の高い溶湯がガス抜き装置１０に達するものと思われる。
尚、対照鋳造金型で目詰まりを発生する原因として、キャビティ３に溶湯を高圧で充填すると、その圧力がキャビティ３からガス抜きゲート６を介してガス抜きガイド路５に流入する溶湯に影響を与え、溶湯が脈動するためと想定した。 In the control casting mold, the clogging of the valve occurred in the degassing apparatus 10 about once every 500 shots. However, in the vacuum casting method and the vacuum casting mold according to the present invention, the degassing apparatus 10 is not used even in 3000 shots. There was no clogging. Although the cause has not been elucidated exactly, in the vacuum casting mold D of the present invention, the gas vent gate 6 is connected to a gate continuous at 45 degrees opposite to the gas flow direction G in the horizontal guide portion 5a and the vertical guide portion 5b. This is probably due to the provision of the angle α. That is, it is also considered that pulsation does not occur in the molten metal flowing from the cavity 3 through the gas vent gate 6 into the gas vent guide path 5.
Further, since the gas flowing into the vertical guide portion 5b from the gas vent gate 6 is excellent in fluidity, the gas can be quickly changed to the gas flow direction G even if the gate continuous angle α is opposite to 45 degrees. Since it has viscosity, it once flows in the continuous direction of the degassing gate 6, that is, in the direction opposite to the gas flow direction G flowing through the vertical guide portion 5 b, and then changes direction and flows in the gas flow direction G. As a result, it is considered that the gas is separated from the molten metal and the molten metal having a high density reaches the degassing device 10.
As a cause of clogging in the control casting mold, when the molten metal is filled into the cavity 3 at a high pressure, the pressure affects the molten metal flowing from the cavity 3 into the degassing guide path 5 through the degassing gate 6. It was assumed that the molten metal pulsated.

本発明による真空鋳造金型の第一実施例は図４の如く、ガス抜きガイド路５の曲がり角（横ガイド部５ａと縦ガイド部５ｂとの交差部）に、縦ガイド部５ｂのガス流動方向Ｇに延長するガイド突出部５ｃを備えている。
縦ガイド部５ｂを流れる溶湯は粘性を有するので、ガス流動方向Ｇに設けたガイド突出部５ｃに進みやすく、ガイド突出部５ｃで冷却固化した時、ガス抜きガイド路５の曲がり角を補強し、冷却固化した製品と一体を成す切捨部材Ｅ、特にガス抜きガイド路５において冷却固化した切捨部材ｅの折損を防ぐ。
尚、溶湯の一部がガイド突出部５ｃに流入することで、ガス抜き装置１０に達した溶湯の圧力変動（圧力上昇）も防げる。即ち、溶湯に混入する溶湯滓等は、溶湯より先に流れる傾向にあるので、溶湯滓がガイド突出部５ｃに溜り、ガス抜き装置１０まで達することが少なくなる。その結果、バルブの目詰まり防止にも役立つと思われる。 In the first embodiment of the vacuum casting mold according to the present invention, as shown in FIG. 4, the gas flow direction of the vertical guide portion 5b is at the corner of the gas vent guide path 5 (intersection of the horizontal guide portion 5a and the vertical guide portion 5b). Guide protrusions 5c extending to G are provided.
Since the molten metal flowing through the vertical guide portion 5b has viscosity, it easily proceeds to the guide protrusion portion 5c provided in the gas flow direction G, and when cooled and solidified by the guide protrusion portion 5c, the bending angle of the gas vent guide path 5 is reinforced and cooled. This prevents breakage of the cutting member E integrated with the solidified product, particularly the cutting member e cooled and solidified in the gas vent guide path 5.
In addition, since a part of molten metal flows into the guide protrusion part 5c, the pressure fluctuation (pressure rise) of the molten metal which reached the degassing apparatus 10 can also be prevented. That is, since the molten metal lees mixed in the molten metal tend to flow before the molten metal, the molten metal is less likely to accumulate in the guide protrusion 5c and reach the gas venting device 10. As a result, it may be useful for preventing valve clogging.

本発明による真空鋳造金型の第二実施例は図５の如く、ガス抜きガイド路５の曲がり角（横ガイド部５ａと縦ガイド部５ｂとの交差部）に、８０度の交差角度βでガイド傾斜部５ｄを連続している。即ち、横ガイド部５ａとガイド傾斜部５ｄの交差角度βを鋭角にすることで、溶湯が交差部で冷却固化した時、ガス抜きガイド路５の曲がり角を補強し、冷却固化した製品と一体を成す切捨部材Ｅ、特にガス抜きガイド路５で冷却固化した切捨部材ｅの折損を防ぐ。
尚、交差角度βを鋭角にすると、溶湯は急激に方向転換できにくく、そのことにより溶湯からガスの分離が促進され、ガスの吸引排出が向上すると思われる。
横ガイド部５ａとガイド傾斜部５ｄとの交差角度βとして採用し得る角度は８９〜６０度であるが、交差角度βを大きくする程、溶湯の通過が容易になり、ガスと共に通過することになるし、交差角度βを小さくする程、溶湯とガスの分離が促進されるが、交差角度βが４５度以下にすると、交差部で溶湯が詰まる。 Second embodiment of a vacuum casting mold according to the invention as shown in FIG. 5, the corner degassing guide path 5 (intersection of the horizontal guide portion 5a and the longitudinal guide portion 5b), guides 80 degrees crossing angle β The inclined portion 5d is continuous. That is, by making the crossing angle β between the horizontal guide part 5a and the guide inclined part 5d acute, when the molten metal is cooled and solidified at the crossing part, the bending angle of the gas vent guide path 5 is reinforced and integrated with the cooled and solidified product. Breakage of the cut-off member E to be formed, in particular, the cut-off member e cooled and solidified in the gas vent guide path 5 is prevented.
If the crossing angle β is set to an acute angle, it is difficult for the molten metal to rapidly change its direction, which promotes the separation of the gas from the molten metal and improves the suction and discharge of the gas.
The angle that can be adopted as the intersecting angle β between the lateral guide portion 5a and the guide inclined portion 5d is 89 to 60 degrees. However, the larger the intersecting angle β, the easier the passage of the molten metal and the passage with the gas. In other words, the smaller the crossing angle β, the more the separation of the molten metal and the gas is promoted. However, when the crossing angle β is 45 degrees or less, the molten metal is clogged at the crossing portion.

（実験例２）
本発明の真空鋳造金型＝図５の通り、実験例１で使用した本発明の真空鋳造金型Ｄにおいて、横ガイド部５ａと縦ガイド部５ｂの間に、交差角度βで連続するガイド傾斜部５ｄを備えた。
ガイド突出部５ｃの突出長さ＝６ｍｍ
交差角度β＝８０度
対照鋳造金型＝図１０の通り。 (Experimental example 2)
As the vacuum casting mold = 5 of the present invention, Oite the vacuum casting mold D of the present invention used in Example 1, between the side guide portion 5a and the longitudinal guide portion 5b, continues in intersection angle β A guide inclined portion 5d was provided .
Projection length of guide projection 5c = 6 mm
Crossing angle β = 80 degrees Control casting mold = as shown in FIG.

対照鋳造金型では、５００ショットで１０回程度、切捨部材ｅの曲がり角での折損が発生した。特に、真空鋳造金型Ｄから切捨部材Ｅを荒々しく取除くと、切捨部材ｅの曲がり角での折損は更に増加したが、本発明による真空鋳造方法と真空鋳造金型では、３０００ショットでも切捨部材ｅの曲がり角での折損はなかった。
切捨部材ｅの一部が真空鋳造金型Ｄに取残されると、取残された切捨部材ｅの排除に時間を浪費する。 In the control casting mold, breakage at the corner of the cut-off member e occurred about 10 times in 500 shots. In particular, when the cutting member E is roughly removed from the vacuum casting mold D, the breakage of the cutting member e is further increased. However, in the vacuum casting method and the vacuum casting mold according to the present invention, 3000 shots are obtained. However, there was no breakage at the corner of the cut-off member e.
When a part of the cut-off member e is left in the vacuum casting mold D, time is wasted in eliminating the left-off cut-off member e.

実施形態ではガス抜き溝４のガス抜きガイド路５を、キャビティ３より少し離れた外側において取囲むように形成したが、キャビティ３の大きさや形状等により、図７の如くキャビティ３の半分を取囲むように形成することも可能である。
真空鋳造金型Ｄの固定金型２１を、金型本体２Ａと、該本体２Ａに組み込む固定金型２ａとから構成する一方、可動金型２２も金型本体２Ｂと、該本体２Ｂに組み込む可動金型２ｂとから構成し、固定金型２ａと可動金型２ｂとの間にキャビティ３を備えることも可能である。 In the embodiment, the gas vent guide path 5 of the gas vent groove 4 is formed so as to surround the outer side slightly away from the cavity 3. However, depending on the size and shape of the cavity 3, half of the cavity 3 is removed as shown in FIG. It is also possible to form it so as to surround it.
The fixed mold 21 of the vacuum casting mold D is composed of a mold main body 2A and a fixed mold 2a incorporated in the main body 2A, while the movable mold 22 is also movable in the mold main body 2B and the main body 2B. It is also possible to provide a cavity 3 between the fixed mold 2a and the movable mold 2b.

Ｖバルブ式ガス抜き装置
１０双バルブ式ガス抜き装置、１単バルブ式ガス抜き装置
１１固定型、１２可動型
１３溶湯路
１４受圧バルブ（ピストン）
１５レバー
１６閉鎖バルブ
１７固定プレート
Ｄ真空鋳造金型（真空ダイカスト金型）
２１固定金型、２Ａ固定金型本体、２ａ固定金型中子
２２可動金型、２Ｂ可動金型本体、２ｂ可動金型中子
２３押し出しピン、２４パイプ
２５湯口ランナー、２６スタンプ
３キャビティ
４ガス抜き溝
５ガス抜きガイド路
５ａ横ガイド部、５ｂ縦ガイド部、５ｃガイド突出部、５ｄガイド傾斜部
６ガス抜きゲート
７ガス抜きブリッジ
Ｓ真空装置、Ｈ吸入ホース
Ｅ，ｅ切捨部材
Ｇガス流動方向
Ｙ溶湯流動方向
α ゲート連続角度
β 交差角度 V valve type gas venting device 10 double valve type gas venting device, 1 single valve type gas venting device 11 fixed type, 12 movable type 13 molten metal path 14 pressure receiving valve (piston)
15 Lever 16 Closing valve 17 Fixed plate D Vacuum casting mold (Vacuum die casting mold)
21 Fixed mold, 2A Fixed mold main body, 2a Fixed mold core 22 Movable mold, 2B Movable mold main body, 2b Movable mold core 23 Extrusion pin, 24 Pipe 25 Sprue runner, 26 Stamp 3 Cavity 4 Gas Vent groove 5 Gas vent guide path 5a Horizontal guide portion, 5b Vertical guide portion, 5c Guide protrusion, 5d Guide inclined portion 6 Gas vent gate 7 Gas vent bridge S Vacuum device, H Suction hose E, e Cutting member G Gas flow Direction Y Melt flow direction α Gate continuous angle β Crossing angle

Claims

In vacuum casting mold D with a valve-type gas venting device attached,
A gas vent groove provided from the cavity toward the valve-type gas vent device is provided outside the cavity, a gas vent guide passage extending from the cavity to the gas vent guide passage, and a gas vent device extending from the gas vent guide passage. It consists of a degassing bridge road that continues to
The valve-type gas venting device includes a double-sided pipe provided with at least a molten metal path that communicates with the degassing bridge path, a pressure receiving valve that reciprocates toward the molten metal path, a closing valve, and a lever that transmits the movement of the pressure receiving valve to the closing valve. A valve-type gas venting device,
The gas vent gate is continued at a gate continuous angle (α) opposite to the gas flow direction (G) in the gas vent guide path, and the gate continuous angle (α) is set to the best range of 40 to 50 degrees. A vacuum casting method characterized in that clogging of a valve in a punching device can be reduced.

In vacuum casting mold D with a valve-type gas venting device attached,
A gas vent groove provided from the cavity toward the valve-type gas vent device is provided outside the cavity, a gas vent guide passage extending from the cavity to the gas vent guide passage, and a gas vent device extending from the gas vent guide passage. It consists of a degassing bridge road that continues to
The valve-type gas venting device includes a double-sided pipe provided with at least a molten metal path communicating with the degassing bridge path, a pressure receiving valve that reciprocates toward the molten metal path, a closing valve, and a lever that transmits the movement of the pressure receiving valve to the closing valve. A valve-type gas venting device,
The degassing gate is continued at the gate continuous angle (α) opposite to the best range of 40 to 50 degrees with respect to the gas flow direction (G) in the degassing guide path so that the valve in the degassing device can be less clogged. A vacuum casting mold characterized by the fact that

The degassing guide path is composed of a horizontal guide part orthogonal to the degassing bridge path and a vertical guide part intersecting and continuous with the front part of the horizontal guide part, and in the extending direction of the vertical guide part at the intersecting part of both guide parts. The vacuum casting mold according to claim 2, further comprising a guide protrusion extending .

The degassing guide path includes a guide inclined portion that is continuous with the horizontal guide portion at an intersection angle (β) at the distal end portion of the horizontal guide portion that is orthogonal to the degassing bridge path, and the vertical guide portion at the end of the guide inclined portion. claim 2 vacuum casting mold wherein that continuously.

The vacuum casting mold according to claim 4, wherein the crossing angle (β) of the lateral guide portion and the guide inclined portion is an acute angle of 60 to 89 degrees.