JPH0768365A - Method for measuring cavity humidity and quality control method in vacuum die casting - Google Patents
Method for measuring cavity humidity and quality control method in vacuum die castingInfo
- Publication number
- JPH0768365A JPH0768365A JP21634893A JP21634893A JPH0768365A JP H0768365 A JPH0768365 A JP H0768365A JP 21634893 A JP21634893 A JP 21634893A JP 21634893 A JP21634893 A JP 21634893A JP H0768365 A JPH0768365 A JP H0768365A
- Authority
- JP
- Japan
- Prior art keywords
- cavity
- humidity
- valve
- atmosphere
- vacuum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、真空鋳造法、特に真空
ダイカストにおけるキャビティの湿度計測方法及び計測
した湿度に基づくワークの品質管理方法に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum casting method, and more particularly to a method for measuring the humidity of a cavity in vacuum die casting and a method for quality control of a work based on the measured humidity.
【０００２】[0002]
【従来の技術】複雑な形状の鋳造物を薄肉かつ高精度に
鋳造する方法として、溶湯をキャビティへ射出する直前
にキャビティ内の大気を真空ポンプ等の真空発生手段に
よって吸引して円滑な湯流れにより緻密なワークを形成
する真空ダイカストが従来から知られており、この真空
ダイカストでは、所定の圧力に減圧したキャビティ内へ
溶湯を射出するため、鋳造されたワークに大気や離型剤
のガスによるブローホール（空孔）が発生するのを抑制
している。2. Description of the Related Art As a method for casting a casting having a complicated shape with a thin wall and with high precision, the atmosphere in the cavity is sucked by a vacuum generating means such as a vacuum pump immediately before the molten metal is injected into the cavity so that the molten metal flows smoothly. Vacuum die casting for forming a dense work has been conventionally known.In this vacuum die casting, the molten metal is injected into the cavity that has been depressurized to a predetermined pressure, so that the cast work is exposed to the atmosphere and the gas of the release agent. It suppresses the generation of blow holes.
【０００３】真空ダイカストにおいては、ワークの取り
出しを容易にするためにキャビティ内部へ予め離型剤を
噴霧・塗布してから型を締め、真空発生手段による真空
引きの後に溶湯の射出を行っている。この離型剤は、水
を主成分として構成され、噴霧・塗布によってキャビテ
ィ内部だけでなく、型の分割面、型に設けられたイジェ
クタピンなどにも浸透してしまう。このため、真空発生
手段による真空引きの際に型の分割面などに浸透した離
型剤がキャビティ内部へ吸い出され、この吸い出された
離型剤と射出された溶湯が接触すると大量の水蒸気が発
生してワーク内部にブローホール（空孔）を形成する場
合があった。In vacuum die casting, a mold release agent is previously sprayed and applied to the inside of the cavity to facilitate the removal of the work, the mold is closed, and the molten metal is injected after the vacuum is generated by the vacuum generating means. . This mold release agent is composed of water as a main component, and when sprayed and applied, the mold release agent penetrates not only into the inside of the cavity but also into the mold dividing surface, the ejector pin provided in the mold, and the like. Therefore, when the vacuum is generated by the vacuum generating means, the mold release agent that has penetrated into the mold dividing surface is sucked into the cavity, and when this sucked mold release agent and the injected molten metal come into contact with each other, a large amount of water vapor is generated. In some cases, blowholes (holes) were formed inside the work due to the occurrence of the above phenomenon.
【０００４】この離型剤からの水蒸気によるブローホー
ルの発生を検知するものとして、特開昭６２−２０７５
６１号公報に開示されるようなキャビティ湿度計測方法
が知られている。Japanese Patent Application Laid-Open No. 62-2075 discloses a method for detecting the generation of blowholes due to water vapor from the release agent.
A cavity humidity measuring method as disclosed in Japanese Patent No. 61 is known.
【０００５】この方法に用いる装置は図５に示すよう
に、真空ダイカスト装置１を構成する金型１０の内部に
画成されたキャビティ１１は、真空バルブ１４、電磁弁
６を介して真空タンク７に接続され、電磁弁６と真空バ
ルブ１４との間の管路にはコントローラ５に接続された
湿度センサ４が介装される。そして、電磁弁６及び真空
バルブ１４を開弁して所定の真空に設定された真空タン
ク７によってキャビティ１１内の真空引きを行うととも
に、キャビティ１１へ溶湯を射出する。この吸引によっ
て、キャビティ１１内の大気は電磁弁６を介して真空タ
ンク７へ吸引され、このとき湿度センサ４が接触した大
気の湿度を計測し、湿度の計測値に応じてワークの良否
を判定するものである。As shown in FIG. 5, the apparatus used in this method has a cavity 11 defined inside a die 10 which constitutes a vacuum die casting apparatus 1 via a vacuum valve 14 and a solenoid valve 6, and a vacuum tank 7. The humidity sensor 4 connected to the controller 5 is interposed in the conduit between the solenoid valve 6 and the vacuum valve 14. Then, the electromagnetic valve 6 and the vacuum valve 14 are opened to evacuate the cavity 11 by the vacuum tank 7 set to a predetermined vacuum, and the molten metal is injected into the cavity 11. By this suction, the atmosphere in the cavity 11 is sucked into the vacuum tank 7 via the electromagnetic valve 6, and at this time, the humidity sensor 4 measures the humidity of the contacted atmosphere and determines the quality of the work according to the measured humidity value. To do.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記従
来の真空ダイカストにおけるキャビティ湿度計測方法に
あっては、真空引きに要する時間が数秒間と短いため、
湿度センサ４の反応時間が短時間でなければ正確な測定
結果が得られず、例えば、反応時間が２０〜３０秒の湿
度センサ（一般市販品）を使用した場合には、キャビテ
ィ内の大気は数秒間で湿度センサ４を通過してしまい、
反応時間を経過した後の湿度センサ４からの計測値はキ
ャビティ１１内のものではなく、管路の湿度を計測して
しまう場合があり、計測されたデータの精度が低下する
という問題があった。However, in the conventional method for measuring the humidity of the cavity in the vacuum die casting, the time required for vacuuming is as short as several seconds,
An accurate measurement result cannot be obtained unless the reaction time of the humidity sensor 4 is short. For example, when a humidity sensor (general commercial product) having a reaction time of 20 to 30 seconds is used, the atmosphere in the cavity is After passing through the humidity sensor 4 in a few seconds,
There is a problem that the measured value from the humidity sensor 4 after the reaction time has passed is not the value in the cavity 11 but the humidity in the pipeline may be measured, and the accuracy of the measured data may be reduced. .
【０００７】そこで本発明は、上記問題点に鑑みてなさ
れたもので、反応時間の遅い湿度センサを使用しても高
精度で計測可能な真空ダイカストにおけるキャビティ湿
度計測方法及び真空ダイカストにおける品質管理方法を
提供するものである。Therefore, the present invention has been made in view of the above problems, and a cavity humidity measuring method in a vacuum die casting and a quality control method in a vacuum die casting capable of measuring with high accuracy even if a humidity sensor having a slow reaction time is used. Is provided.
【０００８】[0008]
【課題を解決するための手段】請求項１の発明は、真空
発生手段によるキャビティの吸引開始とともにキャビテ
ィへの溶湯の供給を開始し、前記キャビティと真空発生
手段との間に介装した湿度測定手段の上流及び下流にそ
れぞれ設けた弁を開弁させてキャビティの大気を湿度測
定手段へ導いた後、前記弁の開弁から所定時間後に前記
弁を閉弁させて大気を封止する一方、前記湿度測定手段
と並行して前記キャビティと真空発生手段とを連通する
バイパスを介してキャビティの吸引を継続させるととも
に、前記湿度測定手段に封止された大気を所定の時間保
持してから湿度の計測を行う。According to a first aspect of the present invention, when the suction of the cavity is started by the vacuum generating means, the supply of the molten metal to the cavity is started, and the humidity measurement is interposed between the cavity and the vacuum generating means. After opening the valve provided respectively upstream and downstream of the means to guide the atmosphere of the cavity to the humidity measuring means, while closing the valve by closing the valve after a predetermined time from the opening of the valve, while sealing the atmosphere. In parallel with the humidity measuring means, suction of the cavity is continued through a bypass that communicates the cavity and the vacuum generating means, and the atmosphere sealed in the humidity measuring means is held for a predetermined time and then the humidity is changed. Take measurements.
【０００９】また、請求項２の発明は、真空発生手段に
よるキャビティの吸引開始とともにキャビティへの溶湯
の供給を開始し、前記キャビティと真空発生手段との間
に介装した湿度測定手段の上流及び下流にそれぞれ設け
た弁を開弁させてキャビティの大気を湿度測定手段へ導
いた後、前記弁の開弁から所定時間後に前記弁を閉弁さ
せて大気を封止する一方、前記湿度測定手段と並行して
前記キャビティと真空発生手段とを連通するバイパスを
介してキャビティの吸引を継続させるとともに、前記湿
度測定手段に封止された大気を所定の時間保持してから
計測した湿度と予め設定した湿度とを制御手段で比較
し、前記計測値が所定値未満のときにワークを良品と判
定する一方、前記計測値が所定値以上のときに不良と判
定する。Further, in the invention of claim 2, the suction of the cavity by the vacuum generating means is started and the supply of the molten metal to the cavity is started, and the upstream of the humidity measuring means interposed between the cavity and the vacuum generating means. After opening the valves respectively provided in the downstream to guide the atmosphere of the cavity to the humidity measuring means, after a predetermined time from the opening of the valve, the valves are closed to seal the atmosphere, while the humidity measuring means is used. In parallel with this, the suction of the cavity is continued through a bypass connecting the cavity and the vacuum generating means, and the humidity measured by holding the atmosphere sealed in the humidity measuring means for a predetermined time and preset The control unit compares the humidity with the measured humidity and determines that the work is a good product when the measured value is less than the predetermined value, and determines that the work is defective when the measured value is equal to or more than the predetermined value.
【００１０】[0010]
【作用】請求項１の発明は、真空発生手段によるキャビ
ティ内部の吸引及びキャビティへの溶湯の供給を開始す
るとともに、前記キャビティと真空発生手段との間に介
装した湿度測定手段の上流及び下流に設けた弁を開弁さ
せてキャビティ内部の大気を湿度測定手段へ導いた後、
前記弁を所定時間開弁させた後に閉弁することでキャビ
ティ内の大気を前記キャビティ及び真空発生手段から遮
断して湿度計測手段に封止する一方、前記湿度測定手段
と並行したバイパス回路を介してキャビティの吸引を継
続させてキャビティ内への溶湯の充填を円滑に行う。湿
度測定手段に封止された大気を所定の時間保持した後に
湿度の計測を行うことで、鋳造工程を阻害することなく
湿度計測手段は反応時間が経過するまで大気と接触して
から正確にキャビティ内の湿度の計測を行うことがで
き、計測した湿度に基づいてキャビティ内へ残存または
吸引された水蒸気の量を感知することができる。According to the invention of claim 1, the suction of the inside of the cavity by the vacuum generating means and the supply of the molten metal to the cavity are started, and the upstream and downstream of the humidity measuring means interposed between the cavity and the vacuum generating means. After opening the valve provided in to guide the atmosphere inside the cavity to the humidity measuring means,
By opening the valve for a predetermined time and then closing the valve, the atmosphere in the cavity is shut off from the cavity and the vacuum generating means and sealed in the humidity measuring means, while a bypass circuit parallel to the humidity measuring means is used. The suction of the cavity is continued to smoothly fill the melt with the molten metal. By measuring the humidity after holding the atmosphere sealed in the humidity measuring means for a predetermined time, the humidity measuring means does not interfere with the casting process until the reaction time elapses, and the humidity measuring means accurately contacts the cavity. The humidity inside can be measured, and the amount of water vapor remaining or sucked into the cavity can be sensed based on the measured humidity.
【００１１】また、請求項２の発明は、前記請求項１の
発明によって計測したキャビティ内の湿度と予め設定し
た所定の湿度とを比較し、計測値が所定値未満であれば
キャビティ内に鋳造されたワークを良品と、計測値が所
定値以上であればワークを不良品とそれぞれ判定し、計
測した湿度に基づいてワークの良否を鋳造直後に判定す
ることができる。Further, the invention of claim 2 compares the humidity in the cavity measured by the invention of claim 1 with a predetermined humidity set in advance, and if the measured value is less than the predetermined value, casting is performed in the cavity. It is possible to judge the processed work as a non-defective product, and if the measured value is a predetermined value or more, to judge the work as a defective product, and to judge the quality of the work immediately after casting based on the measured humidity.
【００１２】[0012]
【実施例】以下、本発明の実施例を添付図面に基づいて
説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
【００１３】図１〜３に示すように、真空ダイカスト装
置１は、図示しないダイプレートで開閉自在に支持され
た金型１０の内部に立て型のキャビティ１１を画成す
る。キャビティ１１の下端は、水平方向に配設されたス
リーブ１２と連通し、スリーブ１２の内周にはシリンダ
１３で駆動されるプランジャ１３Ａが摺動自由に支持さ
れて、シリンダ１３の伸長によって湯口１６から注入さ
れた溶湯がキャビティ１１内へ射出される。As shown in FIGS. 1 to 3, the vacuum die casting apparatus 1 defines a vertical cavity 11 inside a mold 10 which is openably and closably supported by a die plate (not shown). The lower end of the cavity 11 communicates with a sleeve 12 arranged in the horizontal direction, and a plunger 13A driven by a cylinder 13 is slidably supported on the inner circumference of the sleeve 12 so that the extension of the cylinder 13 causes the gate 16 to move. The molten metal injected from is injected into the cavity 11.
【００１４】一方、キャビティ１１の上端には油圧シリ
ンダ１５によって開閉駆動される真空バルブ１４が設け
られ、この真空バルブ１４にはキャビティ１１内を所定
の圧力に減圧する真空回路が接続される。On the other hand, a vacuum valve 14 which is opened and closed by a hydraulic cylinder 15 is provided at the upper end of the cavity 11, and a vacuum circuit for reducing the pressure inside the cavity 11 to a predetermined pressure is connected to the vacuum valve 14.
【００１５】この真空バルブ１４の下流に接続される真
空回路には電磁弁２、３が配設されるとともに、電磁弁
２、３を連通する計測管路４０には湿度計測手段として
の湿度センサ４が配設され、湿度センサ４は電磁弁２、
３の閉弁時に計測管路４０内に封止された大気またはガ
ス（以下大気とする）の湿度を計測してコントローラ５
へ出力する。Electromagnetic valves 2 and 3 are provided in a vacuum circuit connected downstream of the vacuum valve 14, and a humidity sensor as a humidity measuring means is provided in a measuring conduit 40 connecting the electromagnetic valves 2 and 3. 4 is provided, the humidity sensor 4 is a solenoid valve 2,
When the valve 3 is closed, the humidity of the atmosphere or gas (hereinafter referred to as the atmosphere) sealed in the measurement pipe 40 is measured and the controller 5
Output to.
【００１６】電磁弁３の下流には切換弁６を介して真空
発生手段としての真空タンク７が接続される。切換弁６
は電磁弁３の下流を真空タンク７又は大気解放の一方に
接続するものである。A vacuum tank 7 as a vacuum generating means is connected downstream of the solenoid valve 3 via a switching valve 6. Switching valve 6
Is to connect the downstream of the solenoid valve 3 to one of the vacuum tank 7 and open to the atmosphere.
【００１７】真空タンク７は、モータ７２に駆動される
真空ポンプ７１と連通して、真空タンク７の内部は常時
所定の圧力に減圧される。The vacuum tank 7 communicates with a vacuum pump 71 driven by a motor 72 so that the inside of the vacuum tank 7 is constantly depressurized to a predetermined pressure.
【００１８】上記真空回路に加えて、電磁弁２の上流
（電磁弁２と真空バルブ１４の間）と切換弁６の上流
（電磁弁３と切換弁６の間）とを連通するバイパス回路
８が湿度センサ４を備えた計測管路４０と並行して設け
られる。In addition to the above vacuum circuit, a bypass circuit 8 that connects the upstream of the solenoid valve 2 (between the solenoid valve 2 and the vacuum valve 14) and the upstream of the switching valve 6 (between the solenoid valve 3 and the switching valve 6). Are provided in parallel with the measurement conduit 40 having the humidity sensor 4.
【００１９】なお、電磁弁２、３、切換弁６、シリンダ
１３及び油圧シリンダ１５はコントローラ５の指令に基
づいて駆動される。The solenoid valves 2, 3, the switching valve 6, the cylinder 13 and the hydraulic cylinder 15 are driven based on a command from the controller 5.
【００２０】以上のように構成された真空ダイカスト装
置１における鋳造工程の概略を図２に示すサイクル線図
を参照しながら説明した後、キャビティ１１内部の湿度
計測方法について詳述する。The outline of the casting process in the vacuum die casting apparatus 1 configured as described above will be described with reference to the cycle diagram shown in FIG. 2, and then the method for measuring the humidity inside the cavity 11 will be described in detail.
【００２１】真空ダイカスト装置１における鋳造工程
は、図示しないダイプレートを駆動することにより予め
離型剤が塗布された金型１０を締めてキャビティ１１を
閉鎖し、真空バルブ１４を開弁するとともに、シリンダ
１３を所定の低速で伸長させることによりプランジャ１
３Ａが湯口１６から注がれたスリーブ１２内の溶湯をキ
ャビティ１１へ低速で射出する（図２の工程ａ〜ｃ）。In the casting process in the vacuum die casting apparatus 1, by driving a die plate (not shown), the mold 10 to which the release agent has been applied in advance is closed to close the cavity 11, and the vacuum valve 14 is opened. By extending the cylinder 13 at a predetermined low speed, the plunger 1
3A injects the molten metal in the sleeve 12 poured from the sprue 16 into the cavity 11 at a low speed (steps a to c in FIG. 2).
【００２２】そして、工程ｃの低速射出が開始された所
定時間後には切換弁６が作動して電磁弁３の下流が真空
タンク７に接続され（工程ｄ）、この切換弁６が作動し
てから電磁弁２、３が開弁し、キャビティ１１内の大気
は電磁弁２、３を介して真空タンク７へ吸引される（工
程ｅ）。Then, a predetermined time after the low speed injection in the step c is started, the switching valve 6 is operated, the downstream of the solenoid valve 3 is connected to the vacuum tank 7 (step d), and the switching valve 6 is operated. Then, the solenoid valves 2 and 3 are opened, and the atmosphere in the cavity 11 is sucked into the vacuum tank 7 through the solenoid valves 2 and 3 (step e).
【００２３】工程ｅの開始から所定時間後にシリンダ１
３が所定の高速で伸長する高速射出が行われる（工程
ｆ）。この工程ｆの開始直後に工程ｅで開弁した電磁弁
２、３は開弁から予め設定された時間Ｔａが経過するた
め閉弁し、キャビティ１１から吸引された大気は電磁弁
２、３の間の計測管路４０に封止され、湿度センサ４は
キャビティ１１内部の大気の湿度計測を開始する一方、
キャビティ１１内の大気はバイパス回路８を介して真空
タンク７へ吸引され、キャビティ１１内への溶湯の射出
が円滑に継続される。After a predetermined time has passed from the start of the step e, the cylinder 1
High-speed injection in which 3 is extended at a predetermined high speed is performed (step f). Immediately after the start of this step f, the solenoid valves 2 and 3 opened in the step e are closed because a preset time Ta elapses from the opening, and the atmosphere sucked from the cavity 11 is released from the solenoid valves 2 and 3. The humidity sensor 4 is sealed in the measuring pipe 40 between the two, and the humidity sensor 4 starts measuring the humidity of the atmosphere inside the cavity 11.
The atmosphere in the cavity 11 is sucked into the vacuum tank 7 via the bypass circuit 8 and the injection of the molten metal into the cavity 11 is smoothly continued.
【００２４】工程ｆの高速射出が終了した直後には工程
ｄで作動した切換弁６が作動して電磁弁３の下流、すな
わち、バイパス回路８の下流を大気解放に切り換えて真
空タンク７によるキャビティ１１の吸引が終了する。Immediately after the high-speed injection in step f is completed, the switching valve 6 operated in step d is operated to switch the downstream side of the solenoid valve 3, that is, the downstream side of the bypass circuit 8 to the atmosphere release, and the cavity by the vacuum tank 7 is opened. The suction of 11 is completed.
【００２５】高速射出が終了してから所定時間後には、
金型１０が開かれるとともに、図示しないイエジェクタ
が作動してキャビティ１１内に形成されたワークが取り
出される（工程ｇ）。After a lapse of a predetermined time from the end of high-speed injection,
The mold 10 is opened, and an ejector (not shown) is operated to take out the work formed in the cavity 11 (step g).
【００２６】こうして、ワークが取り出された後は、次
の鋳造の準備として、真空バルブ１４の付着物を除去す
るエアブロー（工程ｈ）が行われた後に真空バルブ１４
は油圧シリンダ１５に駆動されて閉弁し（工程ｉ）、金
型１０に離型剤を噴射するとともにエアブローが行わ
れ、されにシリンダ１３を収縮駆動してプランジャ１３
Ａは所定の収縮位置へ復帰して次の鋳造サイクルに備え
る（工程ｊ、ｋ）。In this way, after the work is taken out, as a preparation for the next casting, an air blow (step h) for removing the deposits on the vacuum valve 14 is performed and then the vacuum valve 14 is performed.
Is driven by the hydraulic cylinder 15 to close the valve (step i), the mold release agent is injected into the mold 10 and air is blown, and the cylinder 13 is contracted to drive the plunger 13 to move.
A returns to a predetermined contracted position and prepares for the next casting cycle (steps j, k).
【００２７】上記のようなサイクルで作動する真空ダイ
カスト装置１におけるキャビティ１１内の湿度の測定
は、図２の工程ｅに示す電磁弁２、３の開弁後に行われ
る。The humidity inside the cavity 11 in the vacuum die casting apparatus 1 operating in the above cycle is measured after the solenoid valves 2 and 3 shown in step e of FIG. 2 are opened.
【００２８】コントローラ５で実行される湿度の計測制
御を図３のフローチャートに示し、以下このフローチャ
ートを参照しながら湿度の計測方法を詳述する。The humidity measurement control executed by the controller 5 is shown in the flowchart of FIG. 3, and the humidity measuring method will be described in detail below with reference to this flowchart.
【００２９】上記図２の工程ｃで低速射出が開始される
とともに工程ｄで切換弁６が作動してキャビティ１１の
吸引が開始された後に図３に示す計測ルーチンが実行さ
れ、真空バルブ１４の下流に接続された電磁弁２、３が
開弁駆動する（ステップＳ１）。電磁弁２、３の開弁に
より真空バルブ１４の下流は電磁弁２、３、計測管路４
０及び切換弁６を介して真空タンク７に連通する。After the low-speed injection is started in step c of FIG. 2 and the switching valve 6 is actuated in step d to start sucking the cavity 11, the measurement routine shown in FIG. The solenoid valves 2 and 3 connected downstream are driven to open (step S1). By opening the solenoid valves 2 and 3, the solenoid valves 2 and 3 and the measurement conduit 4 are provided downstream of the vacuum valve 14.
0 and the switching valve 6 to communicate with the vacuum tank 7.
【００３０】このとき、キャビティ１１内部には所定の
低速度で伸長するプランジャ１３Ａによって射出された
スリーブ１２内の溶湯が低速で射出され、この溶湯の射
出に応じてキャビティ１１内部の大気は真空バルブ１４
から電磁弁２、３及び計測管路４０を通過して真空タン
ク７へ吸引される。At this time, the molten metal in the sleeve 12 injected by the plunger 13A extending at a predetermined low speed is injected into the cavity 11 at a low speed, and the atmosphere inside the cavity 11 is vacuumed by the injection of the molten metal. 14
Is passed through the electromagnetic valves 2 and 3 and the measuring conduit 40 and sucked into the vacuum tank 7.
【００３１】そして、電磁弁２、３は所定の時間Ｔａを
経過した後に閉弁して計測管路４０を通過中のキャビテ
ィ１１内の大気を電磁弁２、３の間の計測管路４０の内
部に封止する（ステップＳ２、３）。電磁弁２、３の閉
弁後も真空タンク７によりキャビティ１１の吸引は継続
されるが（工程ｄ）、キャビティ１１内の大気はバイパ
ス回路８を介して真空タンク７へ流入するため溶湯の射
出は円滑に行われるのである。The solenoid valves 2 and 3 are closed after a lapse of a predetermined time Ta so that the atmosphere in the cavity 11 passing through the measurement pipe 40 is discharged from the measurement pipe 40 between the solenoid valves 2 and 3. It is sealed inside (steps S2, 3). The suction of the cavity 11 is continued by the vacuum tank 7 even after the solenoid valves 2 and 3 are closed (step d), but the atmosphere in the cavity 11 flows into the vacuum tank 7 through the bypass circuit 8 and the molten metal is injected. Is done smoothly.
【００３２】時間Ｔａは電磁弁２、３の開弁時間を示
し、例えば、電磁弁２、３の開弁から上記工程ｆで高速
射出が開始された直後までの所定の値に設定され、開弁
直後には計測管路４０内に封止されていた大気を真空タ
ンク７へ排出する一方、溶湯が射出されている間のキャ
ビティ１１内の大気で電磁弁２、３の間の計測管路４０
が満たされるよう、図２に示した真空ダイカスト装置１
の鋳造サイクルに応じて予め設定されたものである。The time Ta indicates the opening time of the solenoid valves 2 and 3. For example, the time Ta is set to a predetermined value from the opening of the solenoid valves 2 and 3 to immediately after the high-speed injection is started in the step f, and the valve is opened. Immediately after the valve, the atmosphere sealed in the measuring pipe 40 is discharged to the vacuum tank 7, while the atmosphere in the cavity 11 while the molten metal is being injected is measured by the measuring pipes between the solenoid valves 2 and 3. 40
So that the vacuum die casting apparatus 1 shown in FIG.
It is preset according to the casting cycle of.
【００３３】こうして、電磁弁２、３の間の計測管路４
０に封止された溶湯と接触したキャビティ１１内の大気
は、予め設定された時間Ｔｂを経過するまで計測管路４
０内に封止されて湿度センサ４と接触し、コントローラ
５は時間Ｔｂが経過した後に湿度センサ４の計測値を読
み込む（ステップＳ４、５）。Thus, the measuring line 4 between the solenoid valves 2 and 3 is
The atmosphere in the cavity 11 that is in contact with the molten metal sealed at 0 is measured by the measurement pipe line 4 until the preset time Tb elapses.
It is sealed in 0 and comes into contact with the humidity sensor 4, and the controller 5 reads the measured value of the humidity sensor 4 after the time Tb has elapsed (steps S4 and S5).
【００３４】この時間Ｔｂは湿度センサ４の反応時間に
応じて予め設定されたものであり、開弁時間Ｔａで計測
管路４０に取り込んだ溶湯の射出中のキャビティ１１内
の大気に計測値が安定する所定の時間Ｔｂが経過するま
で湿度センサ４は接触することができ、反応時間の遅い
湿度センサ４を使用しても計測管路４０に封止した大気
を湿度センサ４が安定する時間Ｔｂまで保持するため、
キャビティ１１内で溶湯と接触した大気の湿度を正確に
計測することが可能となる一方、電磁弁２、３を閉弁し
た後はバイパス回路８を介してキャビティ１１の吸引が
継続されるため円滑に射出、鋳造が継続されて鋳造サイ
クルを遅延又は阻害することがない。This time Tb is preset according to the reaction time of the humidity sensor 4, and the measured value is measured in the atmosphere in the cavity 11 during the injection of the molten metal taken into the measuring pipe 40 at the valve opening time Ta. The humidity sensor 4 can contact until a predetermined time Tb for stabilization elapses, and even if the humidity sensor 4 having a slow reaction time is used, the time Tb during which the humidity sensor 4 stabilizes the atmosphere sealed in the measurement conduit 40. To hold up
While it is possible to accurately measure the humidity of the atmosphere in contact with the molten metal in the cavity 11, after the solenoid valves 2 and 3 are closed, the suction of the cavity 11 is continued via the bypass circuit 8 and thus smooth. Therefore, the injection and casting are not continued and the casting cycle is not delayed or hindered.
【００３５】ステップＳ５で読み込まれた湿度センサ４
の計測値は、コントローラ５に予め設定された所定の湿
度と比較される（ステップＳ６）。この比較において、
湿度の計測値が所定値未満であればキャビティ１１内に
残存または吸引された離型剤と溶湯との接触による水蒸
気が基準値未満であると判定することができ、したがっ
て、鋳造されたワークのブローホールも基準値未満と判
定してコントローラ５は良品を示す判定信号を出力する
（ステップＳ７）。Humidity sensor 4 read in step S5
The measured value of is compared with a predetermined humidity preset in the controller 5 (step S6). In this comparison,
If the measured humidity value is less than the predetermined value, it can be determined that the water vapor caused by the contact between the mold release agent remaining in or sucked into the cavity 11 and the molten metal is less than the reference value. The blow hole is also determined to be less than the reference value, and the controller 5 outputs a determination signal indicating a non-defective product (step S7).
【００３６】一方、ステップＳ６の判定で湿度の計測値
が所定値以上であれば、キャビティ１１内の水蒸気は基
準値以上であると判定することができ、したがって、ワ
ークの内部にブローホールが発生した可能性が高いと判
定し、コントローラ５は不良を示す判定信号を出力す
る。On the other hand, if the measured humidity value is greater than or equal to the predetermined value in the determination in step S6, it can be determined that the water vapor in the cavity 11 is greater than or equal to the reference value, and therefore blowholes are generated inside the work. It is determined that there is a high possibility that the failure has occurred, and the controller 5 outputs a determination signal indicating a defect.
【００３７】コントローラ５からの判定信号を図示しな
い表示装置へ出力すれば鋳造の良否を作業者に知らせる
ことができ、あるいは、図４に示すように、真空ダイカ
スト装置１に近接して配置されたワークを搬送するロボ
ット９へコントローラ５の判定信号を出力すれば、コン
トローラ５の判定結果に応じて鋳造直後のワークを良品
ライン９１又は捨打箱９２へ自動的に選別・搬送するこ
とが可能となり、ブローホールを生じている可能性の高
いワークを高精度で摘出することができ、真空ダイカス
トによる鋳造品の品質管理の精度を向上させることが可
能となる。An operator can be informed of the quality of casting by outputting a judgment signal from the controller 5 to a display device (not shown), or as shown in FIG. 4, the casting die 1 is placed close to the vacuum die casting device 1. By outputting the determination signal of the controller 5 to the robot 9 that conveys the work, it becomes possible to automatically sort and convey the work immediately after casting to the non-defective product line 91 or the waste box 92 according to the determination result of the controller 5. Therefore, it is possible to extract a work having a high possibility of having blowholes with high accuracy, and improve the accuracy of quality control of a cast product by vacuum die casting.
【００３８】上記ステップＳ１〜８を鋳造サイクルに呼
応して実行することにより、キャビティ１１内の湿度を
正確に測定するとともに、形成されたワークのブローホ
ールの有無を予め設定した湿度と比較することにより迅
速に行うことが可能となり、鋳造サイクルの影響を受け
ることなく任意の反応時間の湿度センサ４を採用するこ
とができるのである。By performing the above steps S1 to S8 in response to the casting cycle, the humidity inside the cavity 11 is accurately measured and the presence or absence of blow holes in the formed work is compared with a preset humidity. Therefore, the humidity sensor 4 having an arbitrary reaction time can be adopted without being affected by the casting cycle.
【００３９】さらに、電磁弁２、３はキャビティ１１内
の大気を取り込むとき以外は閉弁しているため、例え
ば、上記図２の工程ｈで行われるエアブローなどにおい
て、圧縮空気で真空回路内を洗浄する場合にも計測管路
４０へ高圧の大気が流入するのを防ぐことができ、湿度
センサ４は高圧の圧縮空気と接触しないために耐久性を
向上させることができる。Further, since the solenoid valves 2 and 3 are closed except when the atmosphere in the cavity 11 is taken in, for example, in the air blow performed in step h of FIG. Even in the case of cleaning, it is possible to prevent the high-pressure atmosphere from flowing into the measurement conduit 40, and the humidity sensor 4 does not come into contact with the high-pressure compressed air, so that the durability can be improved.
【００４０】なお、上記実施例において、電磁弁２、３
の開弁時期は溶湯の射出が開始された後であれば適宜変
更することができ、また、開弁時間Ｔａも射出が完了す
る以前に電磁弁２、３が閉弁可能であれば適宜変更する
ことができる。In the above embodiment, the solenoid valves 2, 3
The valve opening timing of can be changed as appropriate after the injection of the molten metal is started, and the valve opening time Ta can also be appropriately changed if the solenoid valves 2 and 3 can be closed before the injection is completed. can do.
【００４１】[0041]
【発明の効果】以上説明したように請求項１の発明は、
真空発生手段によるキャビティ内部の吸引及びキャビテ
ィへの溶湯の供給を開始するとともに、キャビティと真
空発生手段との間に介装した湿度測定手段の上流及び下
流に設けた弁を開弁させてキャビティ内部の大気を湿度
測定手段へ導いた後、前記弁を所定時間開弁させた後に
閉弁することでキャビティ内の大気を湿度計測手段に封
止する一方、前記湿度測定手段と並行したバイパス回路
を介してキャビティの吸引を継続させてキャビティ内へ
溶湯を充填するようにしたため、湿度測定手段に封止さ
れた大気を所定の時間保持した後に湿度の計測を行うこ
とで、反応時間の遅い湿度計測手段を採用しても鋳造サ
イクルに影響を与えることなく正確にキャビティ内の湿
度の計測を行うことが可能となる。As described above, the invention of claim 1 is
The suction of the inside of the cavity by the vacuum generating means and the supply of the molten metal to the cavity are started, and the valves provided upstream and downstream of the humidity measuring means interposed between the cavity and the vacuum generating means are opened to open the inside of the cavity. After guiding the atmosphere to the humidity measuring means, the atmosphere in the cavity is sealed by the humidity measuring means by opening the valve for a predetermined time and then closing the valve, while a bypass circuit parallel to the humidity measuring means is provided. The molten metal is filled into the cavity by continuing the suction of the cavity through it.By measuring the humidity after holding the atmosphere sealed in the humidity measuring means for a predetermined time, the humidity measurement with a slow reaction time is possible. Even if the means is adopted, the humidity in the cavity can be accurately measured without affecting the casting cycle.
【００４２】また、請求項２の発明は、前記請求項１の
発明によって計測したキャビティ内の湿度と予め設定し
た所定の湿度とを比較し、計測値が所定値未満であれば
キャビティ内に鋳造されたワークを良品と、計測値が所
定値以上であればワークを不良品とそれぞれ判定するよ
うにしたため、特別な検査工程を必要とすることなく鋳
造工直後のワークの欠陥を迅速に判定することが可能と
なり、製造ラインを複雑化することなく正確な品質管理
を行うことができる。Further, the invention of claim 2 compares the humidity in the cavity measured by the invention of claim 1 with a predetermined humidity set in advance, and if the measured value is less than the predetermined value, it is cast in the cavity. Since the determined work is judged as a good product and the work is judged as a defective product if the measured value is equal to or more than a predetermined value, a defect of the work immediately after casting can be promptly judged without requiring a special inspection process. This makes it possible to perform accurate quality control without complicating the production line.
【図１】本発明の実施例を示す真空ダイカスト装置のブ
ロック図である。FIG. 1 is a block diagram of a vacuum die casting apparatus showing an embodiment of the present invention.
【図２】鋳造工程を示すサイクル線図である。FIG. 2 is a cycle diagram showing a casting process.
【図３】湿度計測の内容を示すフローチャートである。FIG. 3 is a flowchart showing the contents of humidity measurement.
【図４】ワーク取り出しロボットを示す概略平面図であ
る。FIG. 4 is a schematic plan view showing a work taking-out robot.
【図５】従来例を示す真空ダイカスト装置の概略図であ
る。FIG. 5 is a schematic view of a vacuum die casting apparatus showing a conventional example.
２、３ 電磁弁 ４ 湿度センサ ５ コントローラ ７ 真空タンク ８ バイパス回路 １１ キャビティ 2, 3 Solenoid valve 4 Humidity sensor 5 Controller 7 Vacuum tank 8 Bypass circuit 11 Cavity
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ２９Ｃ 45/76 7365−4Ｆ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display location B29C 45/76 7365-4F
Claims (2)
始とともにキャビティへの溶湯の供給を開始し、前記キ
ャビティと真空発生手段との間に介装した湿度測定手段
の上流及び下流にそれぞれ設けた弁を開弁させてキャビ
ティの大気を湿度測定手段へ導いた後、前記弁の開弁か
ら所定時間後に前記弁を閉弁させて大気を封止する一
方、前記湿度測定手段と並行して前記キャビティと真空
発生手段とを連通するバイパスを介してキャビティの吸
引を継続させるとともに、前記湿度測定手段に封止され
た大気を所定の時間保持してから湿度の計測を行うこと
を特徴とする真空ダイカストにおけるキャビティ湿度計
測方法。1. A valve which is provided upstream and downstream of a humidity measuring means, which is provided between the cavity and the vacuum generating means, starts supplying molten metal to the cavity at the same time when the suction of the cavity is started by the vacuum generating means. After the valve is opened and the atmosphere in the cavity is guided to the humidity measuring means, the valve is closed after a predetermined time from the opening of the valve to seal the atmosphere, and the cavity is provided in parallel with the humidity measuring means. In a vacuum die casting, characterized in that the suction of the cavity is continued through a bypass communicating with the vacuum generating means, and the humidity sealed by the humidity measuring means is held for a predetermined time and then the humidity is measured. Cavity humidity measurement method.
始とともにキャビティへの溶湯の供給を開始し、前記キ
ャビティと真空発生手段との間に介装した湿度測定手段
の上流及び下流にそれぞれ設けた弁を開弁させてキャビ
ティの大気を湿度測定手段へ導いた後、前記弁の開弁か
ら所定時間後に前記弁を閉弁させて大気を封止する一
方、前記湿度測定手段と並行して前記キャビティと真空
発生手段とを連通するバイパスを介してキャビティの吸
引を継続させるとともに、前記湿度測定手段に封止され
た大気を所定の時間保持してから計測した湿度と予め設
定した湿度とを制御手段で比較し、前記計測値が所定値
未満のときにワークを良品と判定する一方、前記計測値
が所定値以上のときに不良と判定することを特徴とする
真空ダイカストにおける品質管理方法。2. A valve that is provided upstream and downstream of a humidity measuring means that is provided between the cavity and the vacuum generating means, starts supplying molten metal to the cavity when the suction of the cavity is started by the vacuum generating means. After the valve is opened and the atmosphere in the cavity is guided to the humidity measuring means, the valve is closed after a predetermined time from the opening of the valve to seal the atmosphere, and the cavity is provided in parallel with the humidity measuring means. While continuing suction of the cavity via a bypass communicating with the vacuum generating means, the humidity measured by holding the atmosphere sealed in the humidity measuring means for a predetermined time and the preset humidity are controlled by the control means. In comparison, when the measured value is less than a predetermined value, the work is determined to be non-defective, while when the measured value is greater than or equal to the predetermined value, it is determined to be defective. Quality control method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21634893A JP2876949B2 (en) | 1993-08-31 | 1993-08-31 | Cavity humidity measurement method in vacuum die casting and quality control method in vacuum die casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21634893A JP2876949B2 (en) | 1993-08-31 | 1993-08-31 | Cavity humidity measurement method in vacuum die casting and quality control method in vacuum die casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0768365A true JPH0768365A (en) | 1995-03-14 |
| JP2876949B2 JP2876949B2 (en) | 1999-03-31 |
Family
ID=16687149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21634893A Expired - Lifetime JP2876949B2 (en) | 1993-08-31 | 1993-08-31 | Cavity humidity measurement method in vacuum die casting and quality control method in vacuum die casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2876949B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0819487A1 (en) * | 1996-07-17 | 1998-01-21 | Alusuisse Bayrisches Druckguss-Werk GmbH & Co. KG | Device and method to produce pressure die castings |
| WO2012070426A1 (en) * | 2010-11-24 | 2012-05-31 | 東芝機械株式会社 | Quality management device and die casting machine |
| WO2014072188A1 (en) * | 2012-11-12 | 2014-05-15 | Bayerische Motoren Werke Aktiengesellschaft | Method and device for producing a die-cast part |
| KR20230001914A (en) * | 2021-06-29 | 2023-01-05 | 엘지전자 주식회사 | Die-casting process system and control method of the die-casting process system |
-
1993
- 1993-08-31 JP JP21634893A patent/JP2876949B2/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0819487A1 (en) * | 1996-07-17 | 1998-01-21 | Alusuisse Bayrisches Druckguss-Werk GmbH & Co. KG | Device and method to produce pressure die castings |
| WO2012070426A1 (en) * | 2010-11-24 | 2012-05-31 | 東芝機械株式会社 | Quality management device and die casting machine |
| JP2012125839A (en) * | 2010-11-24 | 2012-07-05 | Toshiba Mach Co Ltd | Quality control apparatus and die casting machine |
| DE112011103901B4 (en) * | 2010-11-24 | 2015-05-07 | Toshiba Kikai Kabushiki Kaisha | Quality Management Device and Die Casting Machine |
| US9132477B2 (en) | 2010-11-24 | 2015-09-15 | Toshiba Kikai Kabushiki Kaisha | Quality management device and die-cast molding machine |
| WO2014072188A1 (en) * | 2012-11-12 | 2014-05-15 | Bayerische Motoren Werke Aktiengesellschaft | Method and device for producing a die-cast part |
| CN104661774A (en) * | 2012-11-12 | 2015-05-27 | 宝马股份公司 | Method and device for producing a die-cast part |
| CN104661774B (en) * | 2012-11-12 | 2019-09-06 | 宝马股份公司 | Equipment for manufacturing die casting |
| DE102012220513B4 (en) | 2012-11-12 | 2023-02-16 | Bayerische Motoren Werke Aktiengesellschaft | Method and device for producing a die-cast part |
| KR20230001914A (en) * | 2021-06-29 | 2023-01-05 | 엘지전자 주식회사 | Die-casting process system and control method of the die-casting process system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2876949B2 (en) | 1999-03-31 |
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