JP2005052843A

JP2005052843A - Method for injecting low melting point metallic material

Info

Publication number: JP2005052843A
Application number: JP2003205987A
Authority: JP
Inventors: Norihiro Koda; 紀泰甲田; Mamoru Miyagawa; 守宮川
Original assignee: Nissei Plastic Industrial Co Ltd
Current assignee: Nissei Plastic Industrial Co Ltd
Priority date: 2003-08-05
Filing date: 2003-08-05
Publication date: 2005-03-03
Anticipated expiration: 2023-08-05
Also published as: JP3848939B2

Abstract

<P>PROBLEM TO BE SOLVED: To directly make touchable of a nozzle to a metallic mold horizontally set on a machine table by standing up a molten metal storing cylinder having a preheating part for granular material in an injection heating cylinder even in the case of being an injection device for storing/pouring weighing the molten metal related to the injection device and further, to make removable of the deposit from the bottom part by constituting the bottom part of a molten metal holding chamber in the injection heating cylinder with a covering member 16. <P>SOLUTION: The molten metal holding chamber 14 in the horizontal injection heating cylinder 1 having the weighing chamber 13 communicating with a nozzle hole at the tip end part, is constituted so as to perform the removal of the deposit from the bottom part by closing the bottom part of a vertical hole penetrated in the injection heating cylinder 1 with the covering member 16. The molten metal storing cylinder 2 having a heating means 3 on the molten metal holding chamber 14 at the outer periphery is stood up and the molten metal storing chamber succeeded to the molten metal holding chamber 14, is integrally formed. A hopper device 4 connected to a cylindrical body 42 with a shutter 43 in the molten metal storing cylinder 2 at the lower end of the hopper 41, is connected to the molten metal storing cylinder as the preliminary temperature adjusting part of the granular material M to the cylinder body 42. Further, a storing device is arranged at the lower part of the molten metal storing cylinder 2 from the upper part of the hopper device 4. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
この発明は、亜鉛、マグネシウム又はそれら合金等の低融点金属の粒状材料を溶融し、その溶体を射出プランジャにより金型に射出充填して金属製品に成形する射出装置に関するものである。
【０００２】
【従来の技術】
【０００３】
従来の低融点金属材料の射出装置では、ホッパーの粒状金属材料を予熱加熱してからてから水平な加熱シリンダに供給し、その加熱シリンダ内のスクリュ回転により粒状材料を溶解したのち射出するようにしているしている（例えば、特許文献１参照）。
【０００４】
またノズル口と連通した計量室を先端部に有し、中程上側に供給口を有する筒体内に射出ロッドを備え、射出ロッド先端の射出プランジャを計量室内に進退自在に設けた溶解筒を、型締機構に対し下向きに傾斜し、その溶解筒により粒状材料を溶解すると共に貯留して、射出プランジャの後退移動により溶解筒内の溶湯を吸引計量した後、射出プランジャの前進移動により金型に射出充填するものもある（例えば、特許文献２参照）。
【０００５】
【特許文献１】
特開２００１−１３８０２４号公報（第４−５頁、図１）。
【特許文献２】
特開２００３−２００２４９号公報（第４−５頁、図２）。
【０００６】
【発明が解決しようとする課題】
加熱シリンダの後部上に予備加熱装置付きのホッパーを備えた成形機では、予熱後の粒状金属材料をスクリュフィダにより加熱シリンダの後部に供給しているため、溶解とは別に保温手段が必要となる。またスクリュ回転により溶融した溶体の計量をスクリュ後退により行うことから、成形の都度、材料の供給と溶融とを連続して行わねばならず、材料の予備加熱により溶解能力の不足を補っていても、それに限界があって、多量の材料を短時間で溶解して大型の金属製品を射出成形するには採用し難いとしれている。
【０００７】
また加熱シリンダを液相線温度以上の温度に維持することは容易であっても、加熱温度を固相線温度と液相線温度間に維持し難く、粒状材料を温度むらなく半溶融状態に溶融して、固相が粒状に結晶化した金属組織の製品を射出成形するには技術的に困難であり、予備加熱された粒状材料の温度むらの解消も、フィーダとホッパー部とを仕切る仕切柵の作用により粒状材料を循環させなければならぬなど、材料供給がホッパーから直ちに加熱シリンダに行えないという課題をも有する。
【０００８】
上記特許文献２に記載の成形機では、溶解筒により粒状材料を直接溶解して、材料を多量の溶湯として先端部に貯留し、その一部を内装する射出プランジャの強制後退をもって、射出成形ごとに先端の計量室に吸引計量してから金型に射出しているので、温度制御は多量の溶湯を対象に行われることになり、このため１ショット分の僅かな量の溶湯を対象とする場合よりも温度制御は容易となって、安定した温度管理の下に完全溶融又は半溶融状態の溶体を温度むらなく貯留できるので、射出量に左右されず常に安定した成形が行える。
【０００９】
しかし、この成形機では多量の溶湯に貯留するために、溶解筒を型締装置に対して傾斜設置することを不可欠とする。このため金型へのノズルタッチを湯漏れを来すことなく直接行うことが難しくなり、ノズルタッチはノズルタッチブロックを介した間接的なものとなる。また貯留により生ずる不純物の排出口を設けているが、溶解筒の先端部下側に部分的に設けられた排出口では、先端部下側の全体にわたり沈積した不純物を、清掃時に効率よく除去し難く、成形機としても傾斜設置により後部高さが一段と高くなり、これらが大型化する際の課題となっている。
【００１０】
この発明は、上記従来技術の課題を解決するために考えられたものであって、その目的は、粒状材料を溶融して貯留する成形機であっても、機台上に水平に設置して金型に直接ノズルタッチすることができ、また粒状材料の予備加熱から溶融及び貯留、吸引計量後の射出充填に至るまでの温度管理が容易で、溶体温度を温度むらなく保持でき、沈積物の除去も溶体保持室の底部を蓋部材により構成することによって効率よく行え、構成もこれまでよりも簡素化されて大型化も可能な新たな低融点金属材料の射出装置を提供すことにある。
【００１１】
【課題を解決するための手段】
上記目的によるこの発明は、ノズル口と連通した計量室を先端部に有し、内部に計量室と連通した溶体保持室を有する水平な射出加熱筒と、先端の射出プランジャを計量室に進退自在に挿入して射出加熱筒内に設けた射出ロッドとを備え、上記射出プランジャの強制後退により溶体保持室の溶体を計量室に吸引計量する低融点金属材料の射出装置であって、上記溶体保持室を射出加熱筒に貫設した縦穴の底部を蓋部材により閉塞して、底部から沈積物の除去を行えるように構成し、その溶体保持室の上に加熱手段を外周囲に有する溶融貯留筒を立設して、溶体保持室に及ぶ溶融貯留室を一体形成し、その溶融貯留筒にシャッター付きの筒体をホッパー下端に連設したホッパー装置を、該筒体を粒状材料の予備温調部として溶融貯留筒に連結し、そのホッパー装置の上部から溶融貯留筒の下部内に攪拌装置を設けてなる、というものである。
【００１２】
また上記溶解筒は上部内にアルゴンガス等の不活性ガスパイプを具備し、その不活性ガスパイプは、ガス噴出口の位置が溶融面を境に上下に異なる複数本の不活性ガスパイプからなり、その不活性ガスパイプの圧力差から溶融貯留筒内の溶体貯留量の増減を検出する手段を有する、というものである。
【００１３】
【発明の実施の形態】
図中１は射出加熱筒、２は溶融貯留筒で、それらの外周囲には加熱温度を個々に制御できるヒータ等による加熱手段３が設けてある。４は粒状材料のホッパー装置、５は油圧作動の射出駆動装置、６は金型７を備えた機台８上の型締装置で、この型締装置６に対して射出加熱筒１が射出駆動装置５と共に機台８上に水平に設置してある。
【００１４】
上記射出加熱筒１は、筒状本体１１の先端に部材１１ａをもって取付けたノズル部材１２を備え、そのノズル部材１２のノズル孔と連通する後部内は、所要長さの計量室１３に形成してある。この計量室１３は筒状本体１１の内部に形成した上部開口の縦長の溶体保持室１４と流通口１５を介して連通している。部材１１ａ及びノズル部材１２の外周囲には加熱手段３が設けてある。
【００１５】
上記溶体保持室１４は、筒状本体１１を貫通して穿設した縦穴の底部を、ボルトにより着脱自在に取付けた蓋部材１６により閉塞して構成され、その蓋部材１６の取り外しにより、溶体保持室１４の底部に生じたスラッジやドロスなどの沈積物Ｍ_０を、清掃時に除去できるようにしてある。
【００１６】
筒状本体１１の中央には、筒状本体１１の後端から挿入した射出ロッド１７が、先端の射出プランジャ１８を流通口１５から計量室１２に進退自在に挿入して設けてある。この射出ロッド１７の溶体保持室１４に位置する部分は、複数の環状段部による攪拌部１７ａに形成してある。
【００１７】
また射出ロッド１７の後端は、筒体本体１１の後端に連結した後部部材１９から外部に突出して、上記射出駆動装置５のピストンロツド５１に連結してある。この射出駆動装置５と後部部材１９の支持盤３０は、機台８上に旋回自在に設置固定したベース３１の上部のガイドバー３２に脚部を摺動自在に挿通してあり、これにより射出加熱筒１は射出駆動装置５と共に、上記型締装置６に対して機台８上に水平に設置されている。
【００１８】
上記射出プランジャ１８は、図ではその詳細は省略するが、外周囲にリングバルブを備えたものからなり、そのリングバルブにより、計量室１３の内壁面と射出プランジャ１８の外側面との間形成した吸引クリアランスを開閉して、溶体保持室１４の溶体Ｍ_１の吸引計量と、計量室の溶体Ｍ_２の金型７への射出充填が行い得る構造からなる。
【００１９】
上記溶融貯留筒２は、溶体保持室１４と内径が同径の筒体２１の外周囲に上記加熱手段３と、筒体側部に設けた温度検出端子２２とを備え、下端を溶体保持室１４の上部開口に嵌合して、射出加熱筒１の筒状本体上に垂直に立設してある。これにより溶融貯留筒２の内部は、同一径の溶体保持室１４との一体化により、該溶体保持室に及ぶ溶体貯留室となって、上記射出プランジャ１８の射出動作ごとに、貯留された溶体Ｍ_１が溶体保持室１４から計量室１３に吸引計量されるようになる。
【００２０】
上記ホッパ装置４は、ホッパー４１とその下部に連設した筒体４２と、その筒体４２の下部内に設けた外部から開閉操作が可能なシャッター４３と、材料投入口４４及びガス排出口４５とを有する蓋４６とからなり、その蓋４６の中央に下端が筒体４２の下部内に達する長さの保持筒４７が、図では省略するが断熱手段を介して設けてある。上記シャッター４３には任意構造のものが採用されるが、図示の例は、保持筒４７を取り囲むように設けた多数枚の羽根板を、カム溝とピン及び回動リングとにより構成し、リングを回動して羽根板を開閉する所謂羽根シャッターからなる。
【００２１】
ホッパー４１は、上記筒体４２を溶融貯留筒２の筒体２１の上端に連結して溶融貯留筒２の上に連設され、筒体４２が外周囲に設けた予備加熱手段３ａ（２００°〜３００℃）により、粒状材料Ｍの予備温調部として機能するようにしてある。
【００２２】
上記保持筒４７の内部には、蓋上に設置したモータ４８から溶融貯留筒２の下部内に達する長さで、下端に攪拌部材４９ａを有するの攪拌軸４９が、図示しないモータ軸との接続を断熱的に行って収容して有り、また保持筒４７の内壁に沿ってアルゴンガス等の２本の不活性ガスパイプ５０ａ，５０ｂが、ガス噴出口を溶体Ｍ_１の溶融面を境に上下位置させて上部から溶融貯留筒内に設けてある。
【００２３】
この溶融貯留筒２における溶体Ｍ_１の貯留量は、成形される金属製品の質量によって異なるが、溶体Ｍ_１を長時間にわたり貯留すると金属間化合物が過剰に生成されるおそれがあるので、１０ショット前後の分量を貯留するのが好ましい。この貯留量の増減は、上記不活性ガスパイプ５０ａ，５０ｂにおける圧力差から検出している。
【００２４】
この検出手段は既に実施されているものであって、両不活性ガスパイプ５０ａ，５０ｂのガス噴出口間に溶体Ｍ_１の溶融面が位置して、溶体Ｍ_１に長い方の不活性ガスパイプ５０ｂのガス噴出口が没し、そこに生ずる不活性ガスの噴出抵抗の差から、両ガスパイプに圧力差が生じているときを適正量としている。
【００２５】
これに対して、溶体Ｍ_１の増加による溶融面の上昇により両方のガス噴出口が溶体中に没し、不活性ガスパイプ５０ａの圧力が上昇して、両ガスパイプに圧力差が無くなると満タンを検出して供給停止となる。反対に溶体Ｍ_１の液面が降下して両方のガス噴出口が気中に露出し、不活性ガスパイプ５０ｂの圧力が低下して、両ガスパイプに圧力差が無くなると溶体不足を検出し、警告を発して材料供給が促進される。その何れにおいても射出成形は継続されるので、供給停止後に満タンは解消されて適正量となり材料供給が再開される。溶体不足でも溶融貯留室の溶体深さから貯留量に余裕があるので、その間の材料促進によって適正量に回復するようになる。
【００２６】
溶融貯留筒２及び溶体保持室１４における溶体Ｍ_１の保持温度は、低融点金属材料によって異なり、溶融状態によっても異なる。例えば、マグネシウム合金でも樹枝状組織を有する材料で液相状態に溶融される場合には、その温度を保持して貯留する必要性から、温度は液相線温度以上（例えば、６２０℃）に設定される。
【００２７】
また、そこに採用される粒状材料Ｍとしては、成形後の粉砕材も含まれるが、マグネシウム合金（ＡＺ９１Ｄ）で、固相が粒状に結晶化したチクソトロピー性状を潜在的に有する固体材料を、切削機械により長さが９．０ｍｍ未満に切削されたチップ形状の場合には、粒状材料Ｍを半溶融状態に溶融する目的から、固液共存温度領域の温度（５７０°〜５９５℃）、加熱手段３における設定温度としては液相線温度よりも若干高い温度（６００°）に設定される。
【００２８】
上記構成では、予め設定された回数分の粒状材料Ｍが、材料投入口４４からシャッター４３により筒体内が閉ざされたホッパー４１に送り込まれ、シャッター上からからホッパー内に蓄積される。筒体４２では粒状材料Ｍ_０が外周囲の予備加熱手段３ａにより、部分溶融しない範囲の温度に加熱されたその温度を保持する。
【００２９】
設定回数分の射出成形が済んでカウンターにより検出されると、シャッター４３が開作動して蓄積された設定回数分の粒状材料Ｍが、上記不活性ガスパイプ５０ａ，５０ｂから噴出している不活性ガスにより、不活性ガス雰囲気に維持された溶融貯留筒２に落下し、溶体Ｍ_１の溶融面に落ち込んでゆく。この際の粒状材料の落下供給量は、シャッター４３の開度と時間により制御される。
【００３０】
粒状材料Ｍが落ち込んだ際の溶体温度は、粒状材料との温度差により低下するが、その温度差は蓄積されている間の予備加熱により小さいので、その溶体温度の低下は溶融面近傍に止まり、また溶体Ｍ_１が深く貯留されていることから、溶体保持室１４の溶体にまで及ぶことがなく、材料供給時においても設定温度で溶体Ｍ_１の計量及び射出を行い得る。
【００３１】
また粒状材料Ｍが予備加熱されていることにより、溶融熱による溶融も急速に行われて、溶体Ｍ_１の溶融面に高く積もる間もなく溶融するので蒸し焼き状態がなくなり、これが原因とされるスラッジ等の発生が抑制されることから、溶体保持室１４における沈積物Ｍ_０も減少するようになる。粒状材料Ｍの落下後、タイマーからの指示によりシャッター４３が閉作動して筒体内を閉ざすと、新たな同量の粒状材料Ｍがホッパー４１に送り込まれ、シャッター４３が開作動するまで設定温度に予備加熱される。
【００３２】
溶体保持室１４の溶体Ｍ_１は、上記射出ロッド１５の射出作動後の強制後退により、計量室１３の前進限に位置した射出プランジャ１８が、計量室１３を後退限位置まで移動する間、ノズル口の閉栓によって生ずる負圧で、上記吸引クリアランスから計量室内に吸引されてゆく。
【００３３】
計量室１３に吸引計量された溶体Ｍ_２は、上記射出ロッド１７の前進移動により計量室内を前進移動する射出プランジャ１８によって、ノズル口から型閉した金型７の図示しないキャビティに射出充填され、冷却により所望の金属製品に成形される。この際、吸引クリアランスは溶体Ｍ_２の圧縮抵抗により後退作動するリングバルブにより閉鎖され、吸引クリアランスからの溶体Ｍ_２の逆流が防止される。
【００３４】
したがって、計量室内を進退移動する射出プランジャ１８が、溶融貯留室の溶体Ｍ_１を溶体保持室１４から計量室１３の溶体Ｍ_２として順に送込むポンプを兼ねることになるので、他に溶体Ｍ_１の移送手段は不要となり、射出プランジャ１７が溶体Ｍ_１と接する長さも短くなるので、射出装置全体における温度管理も容易となって、温度むらによる不良成形が減少する。
【００３５】
また溶融貯留室の溶体Ｍ_１は、攪拌軸４９の先端の攪拌部材４９ａと、進退移動する射出ロッド１５が備える環状段部の攪拌部１７ａとにより攪拌されるので、溶体保持室１４におけるスラッジ等の生成が防止される。長期間の稼働により生じた沈積物Ｍ_０は、その殆どが底面を形成する蓋部材１６の上に積もるので、溶体Ｍ_１の殆どを射出したのち、温度が危険範囲よりも低下してから、射出加熱筒１の先端側を機台８の外まで旋回移動して止め、蓋部材１６を外すことによって、溶体保持室１４からそっくり除去することができる。これにより定期的な沈積物Ｍ_０の除去と、溶融貯留室内の清掃を容易に行うことができる。
【００３６】
また射出加熱筒１の溶体保持室１４の上部に、保温貯留筒２を立設したことによって、貯留した溶体Ｍ_１を吸引計量後に射出充填する射出装置であっても、溶融貯留筒２によって溶体Ｍ_１の深さを充分に確保できるので、溶融時に起こりがちなガスの取込みが防止でき、また溶体中のガスの逃出もシャッターが開く度に、ホッパー装置４を通して自然に行われるので、これまでのように射出加熱筒１を型締装置６に対して傾斜設置する必要がなくなる。これにより射出加熱筒１を機台上に水平に設置して金型に直接ノズルタッチすることができることから、ノズルタッチブロックや傾斜支持部材などが不要となり、傾斜設置と比べて機械高さも低くなるので、溶体の貯留・吸引計量を採用した射出装置の大型化も可能となる。
【図面の簡単な説明】
【図１】この発明に係わる低融点金属材料の射出装置の縦断側面図である。
【図２】同上の溶融貯留筒部位の縦断正面図である。
【符号の説明】
１射出加熱筒
２溶融貯留筒
３加熱手段
３ａ予備加熱手段
４ホッパー装置
５射出駆動装置
６型締装置
８機台
１１筒状本体
１２ノズル部材
１３計量室
１４溶体保持室
１５連通口
１６蓋部材
１７射出ロッド
１７ａ攪拌部
１８射出プランジャ
２１溶融貯留筒の筒体
４１ホッパー
４２ホッパーの筒体
４３シャッター
４８攪拌装置のモータ
４９攪拌軸
４９ａ攪拌部材
５０ａ，５０ｂ不活性ガスパイプ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an injection apparatus for melting a granular material of a low melting point metal such as zinc, magnesium, or an alloy thereof, and injecting and filling the solution into a mold by an injection plunger to form a metal product.
[0002]
[Prior art]
[0003]
In the conventional low melting point metal material injection device, the granular metal material of the hopper is preheated and then supplied to a horizontal heating cylinder, and the granular material is melted by rotating the screw in the heating cylinder and then injected. (For example, refer to Patent Document 1).
[0004]
In addition, a melting cylinder having a measuring chamber in communication with the nozzle port at the tip, an injection rod in the cylinder having a supply port in the middle, and an injection plunger at the tip of the injection rod provided in the measuring chamber so as to freely advance and retract, Inclined downward with respect to the mold clamping mechanism, the granular material is melted and stored by the melting cylinder, the molten metal in the melting cylinder is sucked and measured by the backward movement of the injection plunger, and then moved to the mold by the forward movement of the injection plunger. Some are injection-filled (see, for example, Patent Document 2).
[0005]
[Patent Document 1]
JP 2001-138024 A (page 4-5, FIG. 1).
[Patent Document 2]
Japanese Patent Laying-Open No. 2003-200409 (page 4-5, FIG. 2).
[0006]
[Problems to be solved by the invention]
In a molding machine provided with a hopper with a preheating device on the rear part of the heating cylinder, since the granular metal material after preheating is supplied to the rear part of the heating cylinder by a screw feeder, a heat retaining means is required separately from melting. Also, since the solution melted by the screw rotation is measured by retreating the screw, it is necessary to continuously supply and melt the material each time it is molded. However, there is a limit to this, and it may be difficult to adopt a large metal product by injection molding by melting a large amount of material in a short time.
[0007]
Even if it is easy to maintain the heating cylinder at a temperature higher than the liquidus temperature, it is difficult to maintain the heating temperature between the solidus temperature and the liquidus temperature, and the granular material is in a semi-molten state without uneven temperature. It is technically difficult to injection mold a product with a metal structure that has melted and crystallized into a solid phase. The partition that separates the feeder from the hopper is also effective in eliminating uneven temperature of the preheated granular material. There is also a problem that material supply cannot be immediately performed from the hopper to the heating cylinder, for example, the granular material must be circulated by the action of the fence.
[0008]
In the molding machine described in Patent Document 2, the granular material is directly melted by a melting cylinder, the material is stored as a large amount of molten metal at the tip, and the injection plunger forcibly retracting a part of the material is used for each injection molding. In addition, since the sample is sucked into the measuring chamber at the tip and then injected into the mold, the temperature control is performed for a large amount of molten metal. For this reason, a small amount of molten metal for one shot is targeted. Temperature control becomes easier than in the case, and a completely melted or semi-molten solution can be stored without temperature unevenness under stable temperature control, so that stable molding can always be performed regardless of the injection amount.
[0009]
However, in this molding machine, in order to store in a large amount of molten metal, it is indispensable to install the melting cylinder at an inclination with respect to the mold clamping device. For this reason, it becomes difficult to directly perform the nozzle touch to the mold without causing the hot water leak, and the nozzle touch becomes indirect via the nozzle touch block. In addition, although the discharge port for impurities generated by storage is provided, in the discharge port partially provided on the lower side of the distal end portion of the melting cylinder, it is difficult to efficiently remove impurities deposited over the entire lower side of the distal end portion during cleaning, As a molding machine, the height of the rear part is further increased by the inclined installation, which is a problem when these are increased in size.
[0010]
The present invention was conceived in order to solve the above-described problems of the prior art, and its purpose is to install it horizontally on a machine base even in a molding machine that melts and stores granular material. The nozzle can be directly touched to the mold, and the temperature control from the preheating of the granular material to melting and storage, injection filling after suction metering is easy, the solution temperature can be maintained evenly, and the deposit An object of the present invention is to provide a new low melting point metal material injection device that can be efficiently removed by forming the bottom of the solution holding chamber with a lid member, and whose configuration is simplified and can be increased in size.
[0011]
[Means for Solving the Problems]
According to the above-described object, the present invention has a horizontal injection heating cylinder having a measuring chamber communicating with the nozzle opening at the tip, a solution holding chamber communicating with the measuring chamber inside, and an injection plunger at the leading end capable of moving forward and backward to the measuring chamber. An injection rod provided in the injection heating cylinder, and a low melting point metal material injection device for sucking and measuring the solution in the solution holding chamber into the measuring chamber by forcibly retreating the injection plunger. A melt storage cylinder in which the bottom part of a vertical hole penetrating the chamber in the injection heating cylinder is closed by a lid member so that deposits can be removed from the bottom part, and heating means is provided on the outer periphery on the solution holding chamber A hopper device in which a melt storage chamber extending to the solution holding chamber is integrally formed, and a cylinder with a shutter is connected to the melt storage cylinder at the lower end of the hopper, and the cylinder is preliminarily adjusted to a granular material. Connected to the melt storage cylinder as part Formed by providing a stirring device from the upper into the lower of the melting reservoir tube of the hopper, is that.
[0012]
In addition, the melting cylinder includes an inert gas pipe such as argon gas in the upper part, and the inert gas pipe is composed of a plurality of inert gas pipes whose upper and lower positions are different from each other at the melting surface. It has means for detecting an increase / decrease in the amount of stored solution in the molten storage cylinder from the pressure difference of the active gas pipe.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
In the figure, 1 is an injection heating cylinder, 2 is a melt storage cylinder, and a heating means 3 such as a heater capable of individually controlling the heating temperature is provided on the outer periphery thereof. 4 is a granular material hopper device, 5 is a hydraulically operated injection drive device, 6 is a mold clamping device on a machine base 8 equipped with a mold 7, and the injection heating cylinder 1 is driven to inject the mold clamping device 6. It is installed horizontally on the machine base 8 together with the device 5.
[0014]
The injection heating cylinder 1 includes a nozzle member 12 attached to the tip of a cylindrical body 11 with a member 11a, and a rear portion communicating with a nozzle hole of the nozzle member 12 is formed in a measuring chamber 13 having a required length. is there. This measuring chamber 13 communicates with a vertically long solution holding chamber 14 formed in the inside of the cylindrical main body 11 through a circulation port 15. A heating means 3 is provided on the outer periphery of the member 11 a and the nozzle member 12.
[0015]
The solution holding chamber 14 is configured by closing the bottom of a vertical hole that penetrates through the cylindrical main body 11 with a lid member 16 that is detachably attached with a bolt, and the solution holding is achieved by removing the lid member 16. the deposit M _0, such as sludge and dross generated at the bottom of the chamber 14 are also available removed during cleaning.
[0016]
An injection rod 17 inserted from the rear end of the cylindrical main body 11 is provided at the center of the cylindrical main body 11 by inserting an injection plunger 18 at the front end from the flow port 15 into the measuring chamber 12 so as to be able to advance and retract. A portion of the injection rod 17 positioned in the solution holding chamber 14 is formed in a stirring portion 17a having a plurality of annular step portions.
[0017]
The rear end of the injection rod 17 protrudes from the rear member 19 connected to the rear end of the cylindrical body 11 and is connected to the piston rod 51 of the injection driving device 5. The injection driving device 5 and the support plate 30 of the rear member 19 are slidably inserted into the guide bar 32 on the upper part of the base 31 which is installed and fixed on the machine base 8 so as to be slidable. The heating cylinder 1, together with the injection driving device 5, is installed horizontally on the machine base 8 with respect to the mold clamping device 6.
[0018]
Although the details of the injection plunger 18 are omitted in the drawing, the injection plunger 18 is provided with a ring valve on the outer periphery, and is formed between the inner wall surface of the measuring chamber 13 and the outer surface of the injection plunger 18 by the ring valve. by opening and closing the suction clearance, made from a structure and a suction metering of solution M ₁ of solution holding chamber 14, it is injected and filled into the mold 7 of solution M ₂ weighing chambers may be made.
[0019]
The molten storage cylinder 2 includes the heating means 3 and the temperature detection terminal 22 provided on the side of the cylinder around the outer periphery of the cylinder 21 having the same inner diameter as the solution holding chamber 14. And is vertically installed on the cylindrical main body of the injection heating cylinder 1. Thereby, the inside of the melt storage cylinder 2 becomes a solution storage chamber extending to the solution holding chamber by being integrated with the solution holding chamber 14 having the same diameter, and is stored for each injection operation of the injection plunger 18. M ₁ is sucked and measured from the solution holding chamber 14 to the measuring chamber 13.
[0020]
The hopper device 4 includes a hopper 41, a cylinder 42 provided continuously below the hopper 41, a shutter 43 provided in the lower part of the cylinder 42 that can be opened and closed from the outside, a material input port 44, and a gas discharge port 45. A holding cylinder 47 having a length at which the lower end reaches the lower part of the cylindrical body 42 is provided in the center of the lid 46 via a heat insulating means (not shown). The shutter 43 has an arbitrary structure, but in the illustrated example, a plurality of blade plates provided so as to surround the holding cylinder 47 are constituted by cam grooves, pins, and a rotating ring. Is a so-called blade shutter that opens and closes the blade plate.
[0021]
The hopper 41 is connected to the upper end of the cylindrical body 21 of the molten storage cylinder 2 by connecting the cylindrical body 42 to the molten storage cylinder 2, and the preheating means 3a (200 °) is provided on the outer periphery. ˜300 ° C.), it functions as a preliminary temperature control unit for the granular material M.
[0022]
In the holding cylinder 47, a stirring shaft 49 having a length reaching the lower part of the molten storage cylinder 2 from a motor 48 installed on the lid and having a stirring member 49a at the lower end is connected to a motor shaft (not shown). the presence accommodated performed adiabatically, also two inert gas pipe 50a such as argon gas, along the inner wall of the holding cylinder 47, 50b are vertically located on the border of the molten surface of the solution M ₁ a gas port And provided in the melt storage cylinder from above.
[0023]
The storage amount of the solution M ₁ in the molten storage cylinder 2 varies depending on the mass of the metal product to be molded. However, if the solution M ₁ is stored for a long time, an excessive amount of intermetallic compounds may be generated. It is preferable to store the amount before and after. This increase / decrease in the amount of storage is detected from the pressure difference in the inert gas pipes 50a, 50b.
[0024]
The detection means may be those which have already been carried out, both inert gas pipe 50a, and the position is melted surface of the solution M ₁ between the gas ejection port of 50b, the longer the inert gas pipe 50b in solution M ₁ An appropriate amount is set when the pressure difference is generated between the two gas pipes due to the difference in the resistance of the inert gas generated when the gas outlet is submerged.
[0025]
In contrast, both the gas ports by an increase in the melt surface due to the increase of solution M ₁ is immersed in the solution, the pressure of the inert gas pipe 50a is increased, the full differential pressure between both the gas pipe is eliminated Detected and supply stopped. Both gas ejection port by lowering the liquid surface of the solution M ₁ is is exposed in the gas Conversely, decreases the pressure of the inert gas pipe 50b, detects the solution insufficient when the pressure difference disappears on both gas pipe, warning The material supply is promoted. In either case, since injection molding is continued, the full tank is eliminated after the supply is stopped, and the material supply is resumed to an appropriate amount. Even if there is a shortage of solution, there is a surplus in the storage amount from the solution depth of the melt storage chamber, so that the proper amount is recovered by promoting the material during that time.
[0026]
Holding the temperature of solution M ₁ in the melt reservoir tube 2 and the solution holding chamber 14, it depends on the low melting point metal material differs depending molten state. For example, when a magnesium alloy is melted in a liquid phase with a material having a dendritic structure, the temperature is set to the liquidus temperature or higher (eg, 620 ° C.) because it is necessary to maintain and store the temperature. Is done.
[0027]
In addition, the granular material M employed therein includes a pulverized material after molding, but a solid material having a thixotropic property, which is a magnesium alloy (AZ91D) and whose solid phase is crystallized into particles, is cut. In the case of a chip shape cut to a length of less than 9.0 mm by a machine, for the purpose of melting the granular material M into a semi-molten state, the temperature in the solid-liquid coexistence temperature range (570 ° to 595 ° C.), heating means 3 is set to a temperature (600 °) slightly higher than the liquidus temperature.
[0028]
In the above-described configuration, a predetermined number of the granular materials M are sent from the material charging port 44 to the hopper 41 whose cylinder is closed by the shutter 43, and accumulated in the hopper from above the shutter. The preliminary heating means 3a of the particulate material M ₀ in the cylindrical member 42 is an outer periphery, and holds the temperature that has been heated to a temperature range not partial melting.
[0029]
When the preset number of injection moldings are completed and detected by the counter, the inert gas in which the particulate material M corresponding to the set number of times accumulated by opening the shutter 43 is ejected from the inert gas pipes 50a and 50b. Accordingly, drops into the molten reservoir tube 2 maintained in an inert gas atmosphere, Yuku depressed the melting surface of the solution M _1. At this time, the amount of the granular material dropped is controlled by the opening degree and time of the shutter 43.
[0030]
The solution temperature when the granular material M falls is lowered by the temperature difference with the granular material, but the temperature difference is smaller than the preheating while being accumulated, so the decrease in the solution temperature stops near the melting surface. In addition, since the solution M ₁ is deeply stored, the solution M ₁ can be measured and injected at the set temperature even when the material is supplied without reaching the solution holding chamber 14.
[0031]
Further, by granular material M is preheated, being made rapidly even melted by heat of fusion, it is not steamed state since high piles soon melted to the melting surface of the solution M _1, which is such as sludge is caused Since the generation is suppressed, the deposit M ₀ in the solution holding chamber 14 also decreases. When the shutter 43 is closed by the instruction from the timer after the granular material M is dropped and the cylinder is closed, a new equal amount of the granular material M is fed into the hopper 41 and is kept at the set temperature until the shutter 43 is opened. Preheated.
[0032]
The solution M _{1 in the} solution holding chamber 14 is a nozzle while the injection plunger 18 located at the forward limit of the measuring chamber 13 moves to the backward limit position by the forced retraction after the injection operation of the injection rod 15. The negative pressure generated by closing the mouth is sucked into the measurement chamber from the suction clearance.
[0033]
The solution M ₂ sucked and measured in the measuring chamber 13 is injected and filled into a cavity (not shown) of the mold 7 that is closed from the nozzle port by the injection plunger 18 that moves forward in the measuring chamber by the forward movement of the injection rod 17. The desired metal product is formed by cooling. At this time, the suction clearance is closed by a ring valve which retracting operation by the compression resistance of the solution M _2, backflow of solution M ₂ is prevented from suction clearance.
[0034]
Accordingly, the injection plunger 18 to move forward and backward the measuring chamber, so also serves as a pump Komu fed sequentially to a solution M ₁ of molten reservoir as a solution M ₂ metering chamber 13 from the solution holding chamber 14, solution M ₁ other the transfer means becomes unnecessary, since the injection plunger 17 is also shortened length in contact with the solution M _1, becomes easy temperature control in the entire injection apparatus is reduced defective molding due to temperature unevenness.
[0035]
The melt reservoir solution M ₁ of the agitating member 49a at the tip of the stirring shaft 49, since it is stirred by a stirring portion 17a of the annular step the injection rod 15 is provided to move forward and backward, such as sludge in the solution retaining chamber 14 Generation is prevented. Since most of the deposit M ₀ generated by the long-term operation is accumulated on the cover member 16 forming the bottom surface, after most of the solution M ₁ is injected, the temperature falls below the danger range. The injection heating cylinder 1 can be removed from the solution holding chamber 14 by turning and stopping the distal end side of the injection heating cylinder 1 to the outside of the machine base 8 and removing the lid member 16. Thus the removal of the regular deposits M _0, it is possible to easily clean the melt storage chamber.
[0036]
Also on top of the solution holding chamber 14 of the injection heating cylinder 1, by the heat insulating storage cylinder 2 standing, even an injection device for injecting and filling the solution M ₁ which stores after suction weighing solution by melt reservoir tube 2 Since the depth of M ₁ can be secured sufficiently, it is possible to prevent the gas that tends to occur at the time of melting, and the escape of the gas in the solution is naturally performed through the hopper device 4 every time the shutter is opened. It is not necessary to install the injection heating cylinder 1 at an angle with respect to the mold clamping device 6 as described above. As a result, the injection heating cylinder 1 can be installed horizontally on the machine base and can directly touch the nozzle with the mold, so that a nozzle touch block, an inclined support member and the like are not required, and the machine height is lower than that of the inclined installation. Therefore, it is possible to increase the size of the injection apparatus that employs solution storage and suction metering.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view of a low melting point metal material injection apparatus according to the present invention.
FIG. 2 is a longitudinal front view of the same molten storage cylinder portion.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Injection heating cylinder 2 Melting storage cylinder 3 Heating means 3a Preheating means 4 Hopper apparatus 5 Injection drive apparatus 6 Clamping apparatus 8 Machine base 11 Cylindrical main body 12 Nozzle member 13 Measuring chamber 14 Solution holding chamber 15 Communication port 16 Lid member 17 Injection rod 17a Stirrer 18 Injection plunger 21 Molten storage cylinder 41 Hopper 42 Hopper cylinder 43 Shutter 48 Stirrer motor 49 Stirring shaft 49a Stirring members 50a, 50b Inert gas pipe

Claims

ノズル口と連通した計量室を先端部に有し、内部に計量室と連通した溶体保持室を有する水平な射出加熱筒と、先端の射出プランジャを計量室に進退自在に挿入して射出加熱筒内に設けた射出ロッドとを備え、上記射出プランジャの強制後退により溶体保持室の溶体を計量室に吸引計量する低融点金属材料の射出装置であって、
上記溶体保持室を射出加熱筒に貫設した縦穴の底部を蓋部材により閉塞して、底部から沈積物の除去を行えるように構成し、
その溶体保持室の上に加熱手段を外周囲に有する溶融貯留筒を立設して、溶体保持室に及ぶ溶融貯留室を一体形成し、
その溶融貯留筒にシャッター付きの筒体をホッパー下端に連設したホッパー装置を、該筒体を粒状材料の予備温調部として溶融貯留筒に連結し、
そのホッパー装置の上部から溶融貯留筒の下部内に攪拌装置を設けてなることを特徴とする低融点金属材料の射出装置。A horizontal injection heating cylinder having a measuring chamber in communication with the nozzle opening at the tip, a solution holding chamber in communication with the measuring chamber inside, and an injection plunger at the tip are inserted into the measuring chamber so as to freely advance and retract. A low melting point metal material injection device for sucking and metering the solution in the solution holding chamber into the measurement chamber by forcibly retreating the injection plunger,
The bottom of the vertical hole penetrating the solution holding chamber in the injection heating cylinder is closed with a lid member, and the deposit can be removed from the bottom.
On the solution holding chamber, a melt storage cylinder having a heating means on the outer periphery is erected, integrally forming a melt storage chamber extending to the solution holding chamber,
A hopper device in which a cylinder with a shutter is connected to the lower end of the hopper on the melt storage cylinder, and the cylinder is connected to the melt storage cylinder as a preliminary temperature control unit for the granular material,
An injection device for a low-melting-point metal material, characterized in that a stirring device is provided from the upper part of the hopper device to the lower part of the molten storage cylinder.

上記射出ロッドは、溶体保持室に位置する部分に、複数の環状段部による攪拌部を有することを特徴とする請求項１記載の低融点金属材料の射出装置。The low-melting-point metal material injection apparatus according to claim 1, wherein the injection rod has a stirring portion having a plurality of annular step portions in a portion located in the solution holding chamber.

上記溶解筒は上部内にアルゴンガス等の不活性ガスパイプを具備することを特徴とする請求項１記載の低融点金属材料の射出装置。2. The low melting point metal material injection apparatus according to claim 1, wherein the melting cylinder includes an inert gas pipe such as argon gas in an upper portion thereof.

上記不活性ガスパイプは、ガス噴出口の位置が溶融面を境に上下に異なる複数本の不活性ガスパイプからなり、その不活性ガスパイプの圧力差から溶融貯留筒内の溶体貯留量の増減を検出する手段を有することを特徴とする請求項１又は４記載の低融点金属材料の射出装置。The inert gas pipe is composed of a plurality of inert gas pipes whose gas outlets are vertically different from each other at the melting surface, and detects an increase or decrease in the amount of solution stored in the molten storage cylinder from the pressure difference of the inert gas pipe. 5. The low melting point metal material injection apparatus according to claim 1 or 4, further comprising means.