JPH0773779B2 - Vacuum casting method and apparatus - Google Patents
Vacuum casting method and apparatusInfo
- Publication number
- JPH0773779B2 JPH0773779B2 JP63313142A JP31314288A JPH0773779B2 JP H0773779 B2 JPH0773779 B2 JP H0773779B2 JP 63313142 A JP63313142 A JP 63313142A JP 31314288 A JP31314288 A JP 31314288A JP H0773779 B2 JPH0773779 B2 JP H0773779B2
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- Prior art keywords
- vacuum
- cavity
- degree
- molten metal
- casting
- Prior art date
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Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は，ダイカスト品などの真空鋳造品の品質保障を
行なうことができる真空鋳造方法およびその装置に関す
る。Description: TECHNICAL FIELD The present invention relates to a vacuum casting method and apparatus capable of ensuring the quality of vacuum cast products such as die cast products.
真空ダイカスト方法など，金型内のキャビティを真空状
態（減圧状態）にして，溶湯を射出，成形し，ダイカス
ト成形品等を製造する真空鋳造方法は広く利用されてい
る。A vacuum casting method, such as a vacuum die casting method, in which a cavity in a mold is placed in a vacuum state (a reduced pressure state), a molten metal is injected and molded, and a die cast molded product or the like is manufactured, is widely used.
上記真空ダイカスト方法に用いるダイカスト装置は，後
述する第１図に示すごとく，可動型11と固定型12との間
に形成されたキャビティ22と，該キャビティ内を減圧状
態にする真空源３と，上記キャビティ内にアルミニウム
溶湯などの被成形品の溶湯18を射出するプランジャ13と
を有する。なお,21はランナ,23は真空経路である。ま
た，上記真空源３は，バキュームタンク31と真空ポンプ
32とモータ33とよりなる。The die casting apparatus used in the vacuum die casting method includes a cavity 22 formed between a movable die 11 and a fixed die 12, a vacuum source 3 for reducing the pressure inside the cavity, as shown in FIG. A plunger (13) for injecting a molten metal (18) of a molded product such as an aluminum molten metal is provided in the cavity. 21 is a runner and 23 is a vacuum path. The vacuum source 3 includes a vacuum tank 31 and a vacuum pump.
It consists of 32 and a motor 33.
ところで，真空鋳造時においては，前記可動型11と固定
型12との当接面などより，ギャビティ22内に外部より空
気が進入し，キャビティ22内の真空度が充分に確保でき
ないことがある。また、真空源装置の故障により所望す
る真空度が確保できないこともある。By the way, during vacuum casting, air may enter from the outside into the cavity 22 due to the contact surface between the movable die 11 and the fixed die 12, etc., and a sufficient degree of vacuum in the cavity 22 may not be ensured. In addition, a desired vacuum degree may not be ensured due to a failure of the vacuum source device.
かかる事態を生じたとき，成形品の内部には鋳巣が発生
し，成形品を不良品として廃棄しなければならない。更
に，この事態の発見が後れた場合，一度に沢山の不良品
を発生してしまう。When such a situation occurs, a blowhole occurs inside the molded product, and the molded product must be discarded as a defective product. Furthermore, if the discovery of this situation is delayed, many defective products will be generated at once.
そして，かかる鋳巣はキャビティ内の真空度（減圧度）
に応じて減少する。第５図は，その１例を示すもので，
真空度が低いとき（即ち，キャビティ内の圧力が高いと
き）には成形品内のガス量（鋳巣の総容量）が大きく，
真空度が高いとき（キャビティ内圧力が低いとき）には
上記ガス量が小さい。And, such a porosity is a vacuum degree (decompression degree)
Decrease accordingly. Figure 5 shows an example of the
When the degree of vacuum is low (that is, when the pressure in the cavity is high), the amount of gas in the molded product (total volume of the porosity) is large,
The amount of gas is small when the degree of vacuum is high (when the pressure in the cavity is low).
しかして，成形品内のガス量は一般には低ければ低い程
良いが，低くするためには上記のごとく真空度を高くし
なければならない。また，真空度を高くするためにはキ
ャビティ内への空気侵入を阻止するため種々のシーム手
段を講じねばならず，コストも上昇する。また，かかる
空気侵入阻止は，真空度が高くなる程より困難となる。In general, the lower the amount of gas in the molded product, the better. However, in order to reduce the amount of gas, the degree of vacuum must be increased as described above. In addition, in order to increase the degree of vacuum, various seam means must be taken in order to prevent air from entering the cavity, which increases the cost. Further, the prevention of such air intrusion becomes more difficult as the vacuum degree becomes higher.
また，前記のごとく鋳巣の多少によって，ダイカスト成
形品の品質が変動する。そして，この鋳巣の多少と品質
との関係は，鋳巣が少ない程高品質となるが，成形品の
用途によっては鋳巣の許容量が比較的大きくても良いも
のがある。つまり，成形品の種類，即ち形状，材質，用
途等によって，鋳巣の数，全容量の許容範囲が異なる。Further, as described above, the quality of the die-cast molded product varies depending on the number of cavities. The relationship between the number of cavities and the quality is higher as the number of cavities is smaller, but the allowable amount of the cavities may be relatively large depending on the use of the molded product. In other words, the allowable range of the number of cavities and the total capacity varies depending on the type of molded product, that is, the shape, material, application, etc.
そのため，前記のごとき高真空度化によるコストアップ
と，上記成形品の種類による鋳巣の許容範囲，即ち鋳造
時の真空度とを考慮して，成形品の品質保障を行なう必
要がある。Therefore, it is necessary to guarantee the quality of the molded product in consideration of the cost increase due to the high degree of vacuum as described above and the allowable range of the porosity depending on the type of the molded product, that is, the degree of vacuum at the time of casting.
本発明は，かかる問題点に鑑み，真空鋳造成形品の種類
に応じた品質保障を行なうことができる真空鋳造方法及
び装置を提供しようとするものである。In view of such problems, the present invention aims to provide a vacuum casting method and apparatus capable of ensuring quality according to the type of vacuum casting product.
本発明は，金型を当接してキャビティを形成し，該キャ
ビティ内を得ようとする鋳造品の種類に応じた基準真空
度維以上に減圧し，前記キャビティ内に溶湯を射出する
真空鋳造方法であって， キャビティ内を減圧して溶湯射出前のキャビティ内の真
空度を測定し，その後キャビティ内に溶湯を射出し，前
記キャビティ内の真空度と，得ようとする鋳造品に応じ
た基準真空度とを比較し，鋳造品の良否を判別すること
を特徴とする真空鋳造方法にある。The present invention relates to a vacuum casting method in which a mold is abutted to form a cavity, and the cavity is depressurized to a level not lower than a reference vacuum level according to the type of cast product to be obtained, and molten metal is injected into the cavity. The pressure inside the cavity is reduced and the degree of vacuum inside the cavity is measured before the molten metal is injected. Then, the molten metal is injected into the cavity, and the degree of vacuum inside the cavity and the standard according to the cast product to be obtained This is a vacuum casting method characterized by comparing the degree of vacuum with the quality of the cast product.
また，上記方法を実施するための装置としては，金型に
よって形成されたキャビティと，該キャビティ内を減圧
状態にする真空源と，上記キャビティ内に溶湯を射出す
るプランジャとを有する真空鋳造装置において，前記キ
ャビティ内と前記真空源とを遮断する遮断手段と，この
遮断手段によって前記キャビィ内と真空源とが遮断され
た後のキャビティ内の真空度を検出する真空度検知手段
と，得ようとする成形品に応じた基準真空度を設定する
基準真空度設定器と，前記真空度検知手段により検出し
た真空度と前記基準真空度設定器で設定した基準真空度
とを比較する比較演算装置とよりなることを特徴とする
真空鋳造装置がある。As an apparatus for carrying out the above method, a vacuum casting apparatus having a cavity formed by a mold, a vacuum source for reducing the pressure inside the cavity, and a plunger for injecting molten metal into the cavity is used. A shutoff means for shutting off the inside of the cavity and the vacuum source; and a vacuum degree detecting means for sensing the degree of vacuum inside the cavity after the shutoff means shuts off the inside of the cavity and the vacuum source. A reference vacuum degree setting device for setting a reference vacuum degree according to a molded product, and a comparison calculation device for comparing the vacuum degree detected by the vacuum degree detecting means with the reference vacuum degree set by the reference vacuum degree setting device. There is a vacuum casting apparatus characterized in that
しかして，前記真空度検知手段は例えば圧力センサーか
ら成り、例えば圧力センサーは，キャビティ，真空経路
内又はその延長上に配設する。該圧力センサーはキャビ
ティ内の真空度を検出し，それに応じた電気信号を比較
演算装置に出力する。Therefore, the vacuum degree detecting means is composed of, for example, a pressure sensor, and the pressure sensor is arranged in the cavity, the vacuum path, or an extension thereof. The pressure sensor detects the degree of vacuum in the cavity and outputs an electric signal corresponding to the detected degree of vacuum to the comparison operation device.
また，基準真空度設定器は，前記のごとく真空鋳造成形
品の種類に応じて，基準真空度を設定する装置であり，
その設定値を比較演算装置に出力する。即ち，該基準真
空度設定器は成形品の種類に応じて，予め実験により得
られた，当該成形品についての真空度と成形品内ガス量
（例えば第５図）或いは不良率などのデータに基づい
て，必要とする真空度を設定する装置である。上記成形
品の種類としては，形状，材質，用途などがある。Further, the reference vacuum degree setting device is a device for setting the reference vacuum degree according to the type of the vacuum casting product as described above,
The set value is output to the comparison calculation device. That is, the reference vacuum degree setting device uses the data such as the degree of vacuum and the gas amount in the molded article (for example, FIG. 5) or the defect rate, etc., for the molded article, which is obtained in advance according to the type of the molded article. Based on this, it is a device that sets the required degree of vacuum. The types of the above-mentioned molded products include shapes, materials, and uses.
比較演算装置は，真空度検知手段により検出した真空度
の値と基準真空度設定器で設定した基準真空度の値とを
比較する装置である。The comparison operation device is a device for comparing the value of the vacuum degree detected by the vacuum degree detecting means with the value of the reference vacuum degree set by the reference vacuum degree setter.
次に，上記比較結果の信号は，表示装置に送ることもで
きる。この表示装置においては，キャビティの真空度が
基準真空度よりも低いときには，例えば警報音，警報ラ
ンプなどの警告信号を発する。即ち，品質保障が困難又
は不可能であることを表示する。一方，キャビティの真
空度が基準真空度よりも高いときには,OKランプなどに
より品質保障さおれている旨を表示する。Then, the signal of the comparison result can be sent to the display device. In this display device, when the vacuum degree of the cavity is lower than the reference vacuum degree, for example, a warning signal such as a warning sound or a warning lamp is emitted. That is, it indicates that quality assurance is difficult or impossible. On the other hand, when the vacuum degree of the cavity is higher than the reference vacuum degree, an OK lamp etc. indicate that the quality is guaranteed.
また，上記比較結果の信号は，鋳造品の良否を判別する
判別装置に送信し，良否判別を行わせることもできる。Further, the signal of the comparison result can be transmitted to a discriminating device for discriminating whether the cast product is good or bad so that the good or bad can be discriminated.
〔作 用〕 本発明の真空鋳造装置においては，真空度検知手段によ
りキャビティ内の真空度を測定し，この真空度と成形品
の種類に応じて予め設定した基準真空度とを比較し，該
基準真空度よりもキャビティ内真空度が低いとき（即ち
圧力が高いとき）には，警告ランプなどによりその旨を
表示させる。また，基準真空度よりもキャビティ内真空
度が高いときには，ランプ等によりその旨を表示させ
る。[Operation] In the vacuum casting apparatus of the present invention, the degree of vacuum in the cavity is measured by the degree-of-vacuum detection means, and this degree of vacuum is compared with a reference degree of vacuum preset according to the type of molded product. When the degree of vacuum in the cavity is lower than the reference degree of vacuum (that is, when the pressure is high), a warning lamp or the like is displayed to that effect. Further, when the degree of vacuum in the cavity is higher than the reference degree of vacuum, the fact is displayed by a lamp or the like.
そして，キャビティ内真空度が基準真空度よりも低いと
きには，成形品の品質保障が得られないとして，その鋳
造ロットの成形品を不良品と判定する。そして，次の鋳
造ロットの射出に先立って例えば可動型と固定型間のク
リアランスの再確認及び型絞力の調整，或いは真空ポン
プなどの真空源の点検，更には修理を行なう。キャビテ
ィ内真空度が基準真空度より高いときには，その鋳造ロ
ットの成形品は良品と判定する。When the degree of vacuum in the cavity is lower than the reference degree of vacuum, it is determined that the quality of the molded product cannot be guaranteed, and the molded product of the casting lot is determined to be a defective product. Then, prior to the injection of the next casting lot, for example, the clearance between the movable mold and the fixed mold is reconfirmed, the mold drawing force is adjusted, or the vacuum source such as the vacuum pump is inspected and repaired. When the vacuum degree in the cavity is higher than the reference vacuum degree, the molded product of the casting lot is judged as a good product.
本発明によれば，上記のごとく，鋳造品の種類に応じて
予め設定した基準真空度に応じてキャビティ内真空度の
良否を判定し，真空鋳造品の良品，不良品を判別するこ
とができる。また，この真空度の判定に基づいて，真空
源の点検等の保全処置を採ることもできる。According to the present invention, as described above, it is possible to determine whether the vacuum degree in the cavity is good or bad according to the reference vacuum degree preset according to the type of cast product, and to determine the good or defective vacuum cast product. . Also, based on this determination of the degree of vacuum, it is possible to take maintenance measures such as inspection of the vacuum source.
また，基準真空度は成形品の種類に応じて所望する値に
設定することができる。Further, the reference vacuum degree can be set to a desired value according to the type of molded product.
したがって，本発明によれば，真空鋳造成形品の種類に
応じた品質保障を行なうことができる真空鋳造方法及び
その装置を提供することができる。Therefore, according to the present invention, it is possible to provide a vacuum casting method and apparatus capable of ensuring quality according to the type of vacuum casting product.
第１実施例 本例の真空鋳造装置につき第１図〜第３図を用いて説明
する。First Example A vacuum casting apparatus of this example will be described with reference to FIGS. 1 to 3.
本装置は真空ダイカスト装置で第１図に示すごとく，可
動型11と，固定型12と，両者間に形成されるランナー21
及びキャビティ22と，真空源３に接続した真空経路23
と，該真空経路23を通じてキャビティ22内の圧力を検出
する、真空度検知手段としての圧力センサー40とを有す
る。また，固定型12の下方には，ランナー21を通じてキ
ャビティ22内に溶湯18を射出する，プランジャ13を配設
する。This device is a vacuum die casting device, and as shown in FIG. 1, a movable mold 11, a fixed mold 12, and a runner 21 formed between them.
And the cavity 22 and the vacuum path 23 connected to the vacuum source 3.
And a pressure sensor 40 as a degree-of-vacuum detection means for detecting the pressure inside the cavity 22 through the vacuum path 23. Further, below the fixed mold 12, a plunger 13 for injecting the molten metal 18 into the cavity 22 through the runner 21 is arranged.
しかして，該真空鋳造装置は，上記圧力センサー40と電
気的に接続した比較演算装置42を有する。該比較演算装
置42には，基準真空度設定器41及び表示装置43を電気的
に接続する。Therefore, the vacuum casting apparatus has a comparison operation device 42 electrically connected to the pressure sensor 40. A reference vacuum degree setting device 41 and a display device 43 are electrically connected to the comparison operation device 42.
本装置により，真空ダイカスト鋳造を行なうに当たって
は，まず可動型11を固定型12に当接させ，両者間にラン
ナー21,キャビティ22を形成すると共に，真空経路23を
形成する。また，真空源３のモータ33により真空ポンプ
32を作動し，バキュームタンク31,真空経路23を介して
キャビティ22内のガスを排出して，キャビティ22内を源
圧状態にする。そして，キャビティ22内の真空度が上記
基準真空度よりも高い所定値に達した時点で，真空経路
23内に設けた電磁バルプ式のカットオフピン231（図示
せず）を閉止し，キャビティ内を源圧状態に保持する。
その後，プランジャ13を前進させてキャビティ22内に溶
湯を射出する。射出された溶湯はキャビティ内で冷却，
固化され成形品となる。In performing vacuum die casting by this apparatus, first, the movable die 11 is brought into contact with the fixed die 12, a runner 21 and a cavity 22 are formed between them, and a vacuum path 23 is formed. In addition, the vacuum pump is driven by the motor 33 of the vacuum source 3.
32 is actuated, the gas in the cavity 22 is discharged through the vacuum tank 31 and the vacuum passage 23, and the inside of the cavity 22 is set to the source pressure state. When the vacuum degree in the cavity 22 reaches a predetermined value higher than the reference vacuum degree, the vacuum path
The electromagnetic valve type cut-off pin 231 (not shown) provided inside the cavity 23 is closed to maintain the source pressure inside the cavity.
Then, the plunger 13 is advanced to inject the molten metal into the cavity 22. The injected melt is cooled in the cavity,
It is solidified into a molded product.
上記射出終了までの間，キャビティ内真空度は，第２図
に示すごとき経路を取る。即ち，真空源による減圧開始
時点よりキャビティ圧力は低下（真空度が上昇）し始め
る。そして，所定時間或いは所定圧力となった時点Ａ
で，カットオフ（真空経路閉塞）を行なう。次いで,B時
点で溶湯の射出を行なう。ＡとＢの間は，例えば0.1秒
である。しかして、上記ＡとＢの時点の間では，若干の
圧力上昇が見られるが，これはカットオフ後のリークに
よるものである。溶湯射出後は，キャビティ圧力は急激
に上昇する。The vacuum degree in the cavity takes the path as shown in FIG. 2 until the injection is completed. That is, the cavity pressure starts to drop (the degree of vacuum rises) from the time when the vacuum source starts to reduce the pressure. Then, when the pressure reaches a predetermined time or a predetermined pressure A
Then, cut off (vacuum path is closed). Next, at time B, the molten metal is injected. The time between A and B is, for example, 0.1 seconds. Then, between the time points A and B, a slight increase in pressure is observed, which is due to the leakage after the cutoff. The cavity pressure rises rapidly after the molten metal is injected.
しかして，上記真空鋳造時においては，上記圧力センサ
ー40によってキャビティ内の真空度が検出され，その信
号は比較演算装置42に送られる。一方，基準真空度設定
器41においては，当該真空鋳造における成形品の種類に
応じて読め予めてある基準真空度をセットする。しかし
て，該基準真空度の信号は上記比較演算装置42に送信さ
れる。比較演算装置42においては，上記圧力センサー40
で検出したキャビティ内の真空度Ｘと上記基準真空度設
定器41で設定した基準真空度Ｙとの両信号を比較する。
この基準真空度Ｙの値としては，例えば第２図におけ
る，カットオフ時点（符号Ａ）の値を採用する。Therefore, during the vacuum casting, the pressure sensor 40 detects the degree of vacuum in the cavity, and the signal is sent to the comparison operation device 42. On the other hand, the reference vacuum degree setter 41 sets a reference vacuum degree that is readable and preset according to the type of the molded product in the vacuum casting. Then, the reference vacuum degree signal is transmitted to the comparison operation device 42. In the comparison operation device 42, the pressure sensor 40
Both signals of the degree of vacuum X in the cavity detected in step 3 and the reference degree of vacuum Y set by the reference degree of vacuum setting device 41 are compared.
As the value of the reference vacuum degree Y, for example, the value at the cut-off time point (reference A) in FIG. 2 is adopted.
そして,X＞Ｙのときには，上記真空鋳造で得た成形品は
良品と判定される。一方,X＜Ｙのときには，キャビティ
内真空度が，当該成形品の真空鋳造に必要とされる真空
度に達していなかったため，得られた成形品は不良品と
判定される。When X> Y, the molded product obtained by the above vacuum casting is judged to be a good product. On the other hand, when X <Y, the degree of vacuum in the cavity has not reached the degree of vacuum required for vacuum casting of the molded product, so the obtained molded product is determined to be defective.
なお，上記のごとくＸ＜Ｙのときには，次回の鋳造に先
立って金型の型締力調整，シール状態の点検，真空源の
点検等の保全を行なう。When X <Y as described above, maintenance such as mold clamping force adjustment, seal state inspection, and vacuum source inspection is performed prior to the next casting.
また，上記キャビティ内真空度と成形品不良率との関係
は，第３図に示すごとく真空度が大きい（即ちキャビテ
ィ圧力が低い）程，成形品不良率が低い。As for the relationship between the degree of vacuum in the cavity and the defective rate of molded products, as shown in FIG. 3, the higher the degree of vacuum (that is, the lower the cavity pressure), the lower the defective rate of molded products.
また，前記圧力センサーにおける真空度検出信号は，常
時比較演算装置42に送信すること，或いは減圧開始後一
定時間後に１回〜数回パルス送信することもできる。ま
た，該圧力センサーの信号と基準真空度信号との比較
は，常時或いは間欠的に行なうこともできる。Further, the vacuum degree detection signal in the pressure sensor can be constantly transmitted to the comparison / calculation device 42, or can be pulsed once to several times after a fixed period of time after the start of depressurization. Further, the comparison between the signal of the pressure sensor and the reference vacuum degree signal can be performed constantly or intermittently.
上記のごとく，本例装値によれば，真空鋳造成形品の種
類に応じて，品質保障を行なうことができる。As described above, according to the mounting values of this example, it is possible to guarantee the quality according to the type of the vacuum casting product.
第２実施例 本例は，第１実施例の真空鋳造装置において，良否判定
を行なうフローチャートを示すものである。Second Example This example shows a flow chart for making a quality decision in the vacuum casting apparatus of the first example.
まず,S1においては，圧力センサーによる真空度検出値
をサンプリングするため，パルス的又は減圧開始後一定
時間後に，サンプリング信号が発せられる。そして,S2
においては，圧力センサーよりキャビティ内の真空度Ｘ
を採取する。S3においては，圧力センサーの真空度デー
タと，予め設定した基準真空度とを比較し，キャビティ
内の真空度Ｘが基準真空度Ｙよりも小さいときには,S31
に移り，不良品と判定され，更にS32に進み前記保全警
報を発する。この保全警報により，作業者は，次回の真
空鋳造のために，シール状態，真空源等をチェックす
る。First, in S1, the detected value of the degree of vacuum by the pressure sensor is sampled, so a sampling signal is issued in a pulsed manner or after a fixed time after the start of decompression. And S2
, The degree of vacuum in the cavity X from the pressure sensor
To collect. In S3, the vacuum degree data of the pressure sensor is compared with a preset reference vacuum degree, and when the vacuum degree X in the cavity is smaller than the reference vacuum degree Y, S31
Then, it is determined that the product is defective, and the process proceeds to S32 to issue the maintenance alarm. With this maintenance alarm, the worker checks the seal condition, the vacuum source, etc. for the next vacuum casting.
また,S3において，真空度Ｘが基準真空度Ｘよりも大き
い（圧力が低い）ときには,S4に移り，成形品は良品と
判定される。In S3, when the vacuum degree X is larger than the reference vacuum degree X (the pressure is low), the process proceeds to S4, and the molded product is determined to be a good product.
【図面の簡単な説明】 第１図〜第３図は第１実施例を示し，第１図は真空ダイ
カスト装置の説明図，第２図は減圧時間と真空度又はキ
ャビティ内圧力の関係を示す線図，第３図は真空度又は
キャビティ内圧力と不良率との関係を示す図，第４図は
第２実施例におけるフローチャート，第５図は，キャビ
ティ内圧力と成形品内ガス量との関係を例示する線図で
ある。 18……溶湯， 22……キャビティ， 23……真空経路， ３……真空源， 40……圧力センサー，BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 3 show a first embodiment, FIG. 1 is an explanatory view of a vacuum die casting apparatus, and FIG. 2 shows a relationship between depressurization time and degree of vacuum or pressure in cavity. 3 is a diagram showing the relationship between the degree of vacuum or the pressure in the cavity and the defect rate, FIG. 4 is a flow chart in the second embodiment, and FIG. 5 is a diagram showing the relationship between the pressure in the cavity and the gas amount in the molded product. It is a diagram which illustrates a relationship. 18 ... Molten metal, 22 ... Cavity, 23 ... Vacuum path, 3 ... Vacuum source, 40 ... Pressure sensor,
───────────────────────────────────────────────────── フロントページの続き (72)発明者 近藤 文男 愛知県刈谷市昭和町１丁目１番地 日本電 装株式会社内 (72)発明者 星野 昌彦 愛知県刈谷市昭和町１丁目１番地 日本電 装株式会社内 (72)発明者 池谷 誠治 愛知県刈谷市昭和町１丁目１番地 日本電 装株式会社内 (56)参考文献 特開 昭63−4925（ＪＰ，Ａ) 特開 昭59−209468（ＪＰ，Ａ) 特開 昭57−212042（ＪＰ，Ａ) 実開 昭58−194855（ＪＰ，Ｕ) 特公 昭60−21817（ＪＰ，Ｂ２) 特公 平３−24300（ＪＰ，Ｂ２) 特公 昭59−21262（ＪＰ，Ｂ２) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Fumio Kondo 1-1, Showa-cho, Kariya city, Aichi Prefecture Nihon Denso Co., Ltd. (72) Inventor Masahiko Hoshino 1-1-chome, Showa town, Kariya city, Aichi prefecture Co., Ltd. (72) Inventor Seiji Iketani 1-1, Showa-cho, Kariya city, Aichi Nihon Denso Co., Ltd. (56) Reference JP 63-4925 (JP, A) JP 59-209468 (JP) , A) JP 57-212042 (JP, A) Actual development 58-194855 (JP, U) JP 60-6021817 (JP, B2) JP 3-24300 (JP, B2) JP 59-21262 (JP, B2)
Claims (4)
ャビティ内を得ようとする鋳造品の種類に応じた基準真
空以上に減圧し，前記キャビティ内に溶湯を射出する真
空鋳造方法であって， キャビティ内を減圧して溶湯射出前のギャビティ内の真
空度を測定し，その後キャビティ内に溶湯を射出し， 前記キャビティ内の真空度と，得ようとする鋳造品に応
じた基準真空度とを比較し，鋳造品の良否を判別するこ
とを特徴とする真空鋳造方法。1. A vacuum casting method in which a mold is contacted to form a cavity, and the cavity is depressurized to a level not lower than a reference vacuum corresponding to the type of cast product to be obtained, and molten metal is injected into the cavity. Therefore, the inside of the cavity is decompressed and the degree of vacuum inside the cavity is measured before the molten metal is injected. After that, the molten metal is injected into the cavity, and the degree of vacuum inside the cavity and the reference vacuum according to the cast product to be obtained are measured. A vacuum casting method characterized in that the quality of the cast product is determined by comparing it with the degree.
キャビティ内を減圧状態にする真空源と，上記キャビテ
ィ内に溶湯を射出するプランジャとを有する真空鋳造装
置において， 前記キャビティ内と前記真空源とを遮断する遮断手段
と，この遮断手段によって前記キャビティ内と真空源と
が遮断された後のキャビティ内の真空度を検出する真空
度検知手段と，得ようとする成形品に応じた基準真空度
を設定する基準真空度設定器と，前記真空度検知手段に
より検出した真空度と前記基準真空度設定器で設定した
基準真空度とを比較する比較演算装置とよりなることを
特徴とする真空鋳造装置。2. A vacuum casting apparatus having a cavity formed by a mold, a vacuum source for reducing the pressure in the cavity, and a plunger for injecting molten metal into the cavity, wherein the cavity and the vacuum source are provided. And a vacuum degree detection means for detecting the degree of vacuum in the cavity after the cavity and the vacuum source are shut off by the shutoff means, and a reference vacuum according to the molded product to be obtained. A vacuum characterized by comprising a reference vacuum degree setting device for setting the degree of vacuum, and a comparison operation device for comparing the vacuum degree detected by the vacuum degree detecting means with the reference vacuum degree set by the reference vacuum degree setting device. Casting equipment.
て，前記比較槽値からの出力信号を，表示装置によって
表示することを特徴とする真空鋳造装置。3. The vacuum casting apparatus according to claim 2, wherein an output signal from the comparative tank value is displayed by a display device.
て，前記比較装置からの出力信号に基づき，鋳造品の良
否を判別する判別装置を有することを特徴とする真空鋳
造装置。4. The vacuum casting apparatus according to claim 2, further comprising a discriminating device for discriminating the quality of the cast product based on the output signal from the comparison device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63313142A JPH0773779B2 (en) | 1988-12-12 | 1988-12-12 | Vacuum casting method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63313142A JPH0773779B2 (en) | 1988-12-12 | 1988-12-12 | Vacuum casting method and apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02160155A JPH02160155A (en) | 1990-06-20 |
| JPH0773779B2 true JPH0773779B2 (en) | 1995-08-09 |
Family
ID=18037607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63313142A Expired - Fee Related JPH0773779B2 (en) | 1988-12-12 | 1988-12-12 | Vacuum casting method and apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0773779B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2570488B2 (en) * | 1990-10-15 | 1997-01-08 | 日本電装株式会社 | Judgment method for die cast products |
| JP3373362B2 (en) * | 1996-07-22 | 2003-02-04 | 東芝機械株式会社 | Die casting mold cavity pressure monitoring device |
| JP4966911B2 (en) * | 2008-04-21 | 2012-07-04 | 本田技研工業株式会社 | Vacuum casting equipment |
| JP6707718B1 (en) * | 2018-09-21 | 2020-06-10 | 本田技研工業株式会社 | Die casting mold and its depressurization path conductance setting method |
| JPWO2022209504A1 (en) * | 2021-03-30 | 2022-10-06 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58194855U (en) * | 1982-06-15 | 1983-12-24 | マツダ株式会社 | Die casting machine vent valve device |
-
1988
- 1988-12-12 JP JP63313142A patent/JPH0773779B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02160155A (en) | 1990-06-20 |
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