JPH07306104A - Pressure measuring device in metal mold - Google Patents
Pressure measuring device in metal moldInfo
- Publication number
- JPH07306104A JPH07306104A JP9623394A JP9623394A JPH07306104A JP H07306104 A JPH07306104 A JP H07306104A JP 9623394 A JP9623394 A JP 9623394A JP 9623394 A JP9623394 A JP 9623394A JP H07306104 A JPH07306104 A JP H07306104A
- Authority
- JP
- Japan
- Prior art keywords
- plate
- amount
- measuring plate
- bending
- amount measuring
- 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.)
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- Measuring Fluid Pressure (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は，例えば，アルミニウム
合金やマグネシウム合金等の軽金属合金を金型を用いて
加圧鋳造する際に有用な金型内圧力計測装置に関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure measuring device in a mold useful when pressure-casting a light metal alloy such as an aluminum alloy or a magnesium alloy by using a mold.
【０００２】[0002]
【従来の技術】従来より，アルミニウム合金等の軽金属
合金を鋳造する際は，一般的に，引け巣を低減するた
め，溶湯を金型に鋳込んでから凝固が完了するまでの
間，高圧力を加圧し続ける方法が採られてきた。特に，
自動車部品等のように耐圧性，高強度等の高品質が要求
される場合，上記のような高圧で鋳造する方法が多く用
いられている。この場合，製品各部に充填している溶湯
に加わる圧力の大きさが，製品の品質に大きく影響を及
ぼす。このため，従来より，溶湯の圧力を計測して，そ
れを鋳造条件の管理に利用することがあったが，その場
合には，押出ピンの裏に歪ゲージをセットし，溶湯の圧
力を計測していた。2. Description of the Related Art Conventionally, when casting a light metal alloy such as an aluminum alloy, in general, in order to reduce shrinkage cavities, high pressure is applied from the time when the molten metal is cast into the mold until the solidification is completed. The method of continuing to pressurize has been adopted. In particular,
When high quality such as pressure resistance and high strength is required such as automobile parts, the above-mentioned high pressure casting method is often used. In this case, the magnitude of the pressure applied to the molten metal filling each part of the product greatly affects the quality of the product. For this reason, conventionally, the pressure of the molten metal was measured and used to control the casting conditions. In that case, a strain gauge was set on the back of the extrusion pin and the pressure of the molten metal was measured. Was.
【０００３】このように，押出ピンの裏に歪ゲージをセ
ットした場合，押出ピンの金型等に対する摺動抵抗や摩
擦力のため，計測値が正確でないという問題があった。
この摺動抵抗は，鋳造を続けていくうちに，焼付き，か
じり等によって増加する。なお，特願平４−３４２５７
５号に記載した，加圧力をパルス的に加える場合，特
に，この問題が大きくクローズアップされる。すなわ
ち，押出ピンにかけられた圧力が減少から増加に転じた
場合，その増加分が静止摩擦力を越えるまでの間は，押
出ピンは静止してしまう。逆に，圧力が増加から減少に
転じた場合も，その減少分が静止摩擦力を越えるまでの
間は，押出ピンは静止する。そのため，圧力変動が静止
摩擦力より小さい場合は，押出ピンが全く動かず，圧力
を計測できないケースが出てくることがあった。As described above, when the strain gauge is set on the back of the extrusion pin, there is a problem that the measured value is not accurate due to the sliding resistance and frictional force of the extrusion pin with respect to the mold or the like.
This sliding resistance increases due to seizure, galling, etc. as casting is continued. In addition, Japanese Patent Application No. 4-34257
This problem is greatly highlighted especially when the pressing force is applied in pulses as described in No. 5. That is, when the pressure applied to the extrusion pin changes from a decrease to an increase, the extrusion pin remains stationary until the increase exceeds the static friction force. Conversely, when the pressure changes from increasing to decreasing, the push pin remains stationary until the amount of decrease exceeds the static friction force. Therefore, if the pressure fluctuation is smaller than the static frictional force, the push pin may not move at all and the pressure may not be measured in some cases.
【０００４】そこで，本出願人会社では，このような欠
点を解消するために，金型内圧力計測装置を，金型のキ
ャビティに面した部分の一部が加圧力によって撓むよう
な構造にし，従来のように摺動抵抗を受けることなく，
正確に溶湯の圧力を計測できるようにした。そして，例
えば，特願平５−１１６０１４号や特願平５−２７９５
１１号明細書に記載したように，金型のキャビティ側の
表面の一部に撓み板部を設け，撓み板部の中央部裏側に
先端が接している撓み量伝達棒を配し，撓み量伝達棒の
後端面に例えば円板状の撓み量計測板を押付けた状態で
配し，金型に取付けた保持具で撓み量計測板の外周部を
支持し，撓み量計測板の平面部に歪ゲージを取付けた。Therefore, in order to eliminate such drawbacks, the applicant company has an in-mold pressure measuring device having a structure in which a part of the part of the mold facing the cavity is bent by a pressing force. Without receiving sliding resistance as in the past,
The pressure of the molten metal can be measured accurately. And, for example, Japanese Patent Application No. 5-116014 and Japanese Patent Application No. 5-2795.
As described in No. 11, a bending plate is provided on a part of the surface of the mold on the cavity side, and a bending amount transmitting rod whose tip is in contact with the back side of the central part of the bending plate is arranged to obtain the bending amount. For example, a disk-shaped flexure amount measurement plate is placed on the rear end surface of the transmission rod in a pressed state, and the outer periphery of the flexure amount measurement plate is supported by a holder attached to the die, and the flat surface part of the flexure amount measurement plate is supported. A strain gauge was attached.
【０００５】[0005]
【発明が解決しようとする課題】しかし，これらの方
法，装置においては，撓み量計測板として円板状のもの
を用い，撓み量計測板の外周全部を単純支持で支持して
いたので，歪ゲージによる歪や撓み量の計測，および，
それに伴って演算して求める金型内の圧力を正確に求め
ることが比較的に難しかった。However, in these methods and devices, since a disk-shaped bending amount measuring plate is used and the entire circumference of the bending amount measuring plate is supported by simple support, strain Measurement of strain and deflection with a gauge, and
Accompanying this, it has been relatively difficult to accurately obtain the pressure in the die that is calculated and obtained.
【０００６】すなわち，従来のものでは，図４に示すよ
うに，円板状の撓み量計測板３０の裏側に歪ゲージ３１
がはり付けてあり，図４に図示していない金型のキャビ
ティに面した部分の加圧力によって撓むようにした部分
の裏側に先端を当接させている撓み量伝達棒３２の後端
を撓み量計測板３０の表面の中央部に当接させていたの
で，撓み量計測板３０は，加圧力の大きさによって，例
えば，図４に実線で示したように湾曲したり，２点鎖線
で示したように湾曲する。That is, in the conventional case, as shown in FIG. 4, a strain gauge 31 is provided on the back side of the disk-shaped bending amount measuring plate 30.
The tip end is abutted against the back side of the portion of the mold facing the cavity, which is not shown in FIG. 4, and the rear end of the deflection transmission rod 32 is bent. Since it is brought into contact with the central portion of the surface of the measurement plate 30, the deflection amount measurement plate 30 is curved, for example, as shown by the solid line in FIG. 4 or shown by the chain double-dashed line, depending on the magnitude of the pressing force. Bends like
【０００７】この場合，撓み量はそれぞれδ1 ，δ2 と
なり，支持部材３３の角から撓み量計測板３０の端部ま
での距離は，それぞれａ，ｂとなり，撓むにしたがっ
て，この距離は短くなる。このように，撓み量の変化に
伴って支持点が移動するので，歪変化が直線的でなくな
る。In this case, the bending amounts are δ 1 and δ 2 , respectively, and the distances from the corners of the supporting member 33 to the ends of the bending amount measuring plate 30 are a and b, respectively. It gets shorter. In this way, since the support point moves with the change in the amount of bending, the strain change is not linear.
【０００８】また，撓み量計測板３０は円板であり，単
純支持であるため，その芯がずれる場合もあり，そのた
めに正しい計測値が得られない場合もある。一方，前記
従来の方法，装置では，金型の温度変化の歪ゲージへの
影響が考慮されていなかった。すなわち，温度の歪ゲー
ジ抵抗値への影響が考慮されていなかった。Further, since the flexure amount measuring plate 30 is a circular plate and is simply supported, its core may be displaced, which may result in failure to obtain a correct measured value. On the other hand, in the above-mentioned conventional method and device, the influence of the temperature change of the mold on the strain gauge was not taken into consideration. That is, the effect of temperature on the strain gauge resistance value was not taken into consideration.
【０００９】また，従来のものでは，撓み量伝達棒３２
の先端部の金型の撓み板部の裏面に当接している部分，
および，撓み量伝達棒３２の後端部の撓み量計測板３０
に当接している部分が所定の幅を有する平面になってい
たので，金型の撓み板部や撓み量計測板３０が撓んだと
きに，撓み量伝達棒３２の先端部や後端部との当接位置
が変化することがあった。Further, in the conventional one, the deflection amount transmission rod 32
Of the tip of the abutting part of the back surface of the flexible plate of the mold,
Also, the bending amount measuring plate 30 at the rear end of the bending amount transmission rod 32
Since the portion in contact with the flat surface has a predetermined width, when the bending plate portion of the mold or the bending amount measuring plate 30 bends, the bending amount transmitting rod 32 has a front end portion or a rear end portion. The contact position with and sometimes changed.
【００１０】また，例えば，図５に示したように，計測
部分である金型の撓み板部３４に作用する力Ｆの作用点
が，撓み量伝達棒３２の位置と違った場合は，撓み量伝
達棒３２の先端部の一方の角３２ａのみに撓み板部３４
が当るようになり，正確な計測がし難い。このような種
々の理由により，従来は正確な金型内圧力を求めるのが
できなかったか，あるいは，できたとしても，非常に難
しく，面倒であった。Further, for example, as shown in FIG. 5, when the acting point of the force F acting on the bending plate portion 34 of the mold, which is the measuring portion, is different from the position of the bending amount transmitting rod 32, The flexible plate portion 34 is provided only on one corner 32a of the tip portion of the quantity transmission rod 32.
It becomes difficult to make accurate measurements. Due to various reasons as described above, it has been difficult or difficult to obtain an accurate in-mold pressure in the past.
【００１１】[0011]
【課題を解決するための手段】本発明は，このような課
題を解決するために行ったものであり，金型のキャビテ
ィ側の表面の一部に撓み板部を設け，撓み板部の中央部
等の裏面に先端が接している撓み量伝達棒を配し，撓み
量伝達棒の後端面に撓み量計測板を押付けた状態で配
し，金型に取付けた保持具で撓み量計測板の一部を支持
し，撓み量計測板の平面部に歪ゲージを取付けた金型内
圧力計測装置において，撓み量計測板を平板状とし，こ
の平板状の撓み量計測板の一端部を前記保持具に片持梁
状に固定し，撓み量伝達棒の後端面が撓み量計測板に当
接している位置よりも根本側で歪ゲージを撓み量計測板
に取付けた。The present invention has been made in order to solve such a problem, and a bending plate portion is provided on a part of the cavity side surface of a mold, and the bending plate portion has a center portion. The bending amount transmitting rod whose tip is in contact with the back surface of the part is placed, and the bending amount measuring plate is pressed against the rear end face of the bending amount transmitting rod, and the bending amount measuring plate is attached by the holder attached to the mold. In the in-mold pressure measuring device that supports a part of the plate, and the strain gauge is attached to the flat surface of the bending amount measuring plate, the bending amount measuring plate is made into a flat plate shape, and one end of this flat plate shaped bending amount measuring plate is The strain gauge was fixed to the holder in a cantilever shape, and the strain gauge was attached to the deflection amount measurement plate at the root side of the position where the rear end face of the deflection amount transmission rod was in contact with the deflection amount measurement plate.
【００１２】また，撓み量伝達棒の後端面が撓み量計測
板に当接している位置よりも先端側で温度補償用歪ゲー
ジを撓み量計測板に取付けた。さらに，撓み板部の中央
部裏面に接している撓み量伝達棒の先端中央部を先細形
状にしたり，撓み量計測板に当接している撓み量伝達棒
の後端中央部を先細形状にした。Further, a temperature compensating strain gauge is attached to the flexure amount measuring plate at the tip end side of the position where the rear end surface of the flexure amount transmitting rod is in contact with the flexure amount measuring plate. Further, the center of the tip of the bending amount transmitting rod that is in contact with the back surface of the center of the bending plate is tapered, or the center of the rear end of the bending amount transmitting rod that is in contact with the bending amount measuring plate is tapered. .
【００１３】[0013]
【作用】金型のキャビティ内に溶湯等が射出されてキャ
ビティ内に圧力が発生すれば，撓み板部が撓み，撓み量
伝達棒が押され，片持支持されている平板状の撓み量計
測板が撓み，歪ゲージでその歪量を計測する。この歪量
をコンピュータ等で演算し，金型内圧力を求める。[Function] When molten metal or the like is injected into the cavity of the mold and pressure is generated in the cavity, the bending plate portion bends, the bending amount transmission rod is pushed, and the plate-shaped bending amount supported in a cantilever manner is measured. The plate bends and the amount of strain is measured with a strain gauge. The amount of strain is calculated by a computer, etc., and the pressure inside the mold is determined.
【００１４】この場合，撓み量計測板は片持固定支持さ
れており，歪ゲージは撓み量計測板の根本側に取付けら
れているので，支点が移動しないし，歪変化が直線的に
あらわれ，歪を容易に計測することができ，また，温度
補償用歪ゲージを撓み量計測板の先端側の無変形部分に
取付けているので，温度変化によって変化した撓み量計
測板の伸びのみを正確に計測することができ，温度補償
をすることができる。In this case, since the deflection amount measuring plate is cantilevered and fixed and the strain gauge is attached to the base side of the deflection amount measuring plate, the fulcrum does not move and the strain change appears linearly. The strain can be easily measured, and since the temperature compensating strain gauge is attached to the non-deformation part on the tip side of the deflection amount measurement plate, only the extension of the deflection amount measurement plate that changes due to temperature change can be accurately measured. It can be measured and temperature can be compensated.
【００１５】また，撓み量伝達棒の先端部と後端部が先
細形状になっているので，撓み板部や撓み量計測板との
接触点が変化したり，ずれたりすることがなく，常に良
好な計測が行える。Further, since the tip end portion and the rear end portion of the flexure amount transmission rod are tapered, the contact points with the flexure plate portion and the flexure amount measuring plate do not change or shift, and are always Good measurement is possible.
【００１６】[0016]
【実施例】図１，図２は本発明の１実施例を示すもの
で，図１は縦断面図，図２は底面図である。１は金型の
一部，２は金型１内の溶湯鋳込空間であるキャビティ，
３は金型１のキャビティ２側の表面の一部に設けた比較
的に薄い円形状の撓み板部であり，したがって，撓み板
部３の後方には，比較的に深い穴４が後側から設けられ
ている。1 and 2 show one embodiment of the present invention. FIG. 1 is a longitudinal sectional view and FIG. 2 is a bottom view. 1 is a part of the mold, 2 is a cavity which is a molten metal pouring space in the mold 1,
Reference numeral 3 denotes a relatively thin circular flexible plate portion provided on a part of the surface of the mold 1 on the side of the cavity 2. Therefore, behind the flexible plate portion 3, a relatively deep hole 4 is provided on the rear side. It is provided by.
【００１７】撓み板部３の中央部の裏側には，丸棒状の
撓み量伝達棒５の先端を接しさせて配し，撓み量伝達棒
５の後端面に比較的に薄い平板状の撓み量計測板６の中
央部を押付けた状態または当接した状態で配した。穴４
の中には，段付円筒状のブロック７を装入し，ブロック
７は，その先端面を撓み板部３の裏面に接触させた状態
で，ボルト８によって，金型１の後側に取付けた。撓み
量伝達棒５の外周面の一部はブロック７の一部で軸線方
向に摺動自在にガイドしておくのが望ましい。On the back side of the central portion of the bending plate portion 3, a round bar-shaped bending amount transmission rod 5 is disposed so as to be in contact with the tip thereof, and a relatively thin flat plate-shaped bending amount is formed on the rear end face of the bending amount transmission rod 5. The measurement plate 6 was arranged in a state where the central portion thereof was pressed or abutted. Hole 4
A stepped cylindrical block 7 is inserted into the inside of the mold, and the block 7 is attached to the rear side of the mold 1 with a bolt 8 in a state where the tip surface of the block 7 is in contact with the back surface of the flexible plate portion 3. It was It is desirable that a part of the outer peripheral surface of the flexure amount transmission rod 5 is guided by a part of the block 7 so as to be slidable in the axial direction.
【００１８】ブロック７の中央部に設けた円形穴の後端
部には，筒状の部材９をねじ取付けした。部材９には，
その内部を上下方向に貫通している断面凸状の穴１０を
設けた。また，突起状の穴１０ａのない側の部材９は，
その一部を一定幅で切削して高さを低く加工した。A tubular member 9 was screwed to the rear end of the circular hole provided in the center of the block 7. In the member 9,
A hole 10 having a convex cross-section is provided so as to pass through the inside thereof in the vertical direction. Further, the member 9 on the side without the protruding hole 10a is
Part of it was cut with a constant width to reduce the height.
【００１９】この加工した面に，平板状の撓み量計測板
６の一端側を，押え板１１とボルト１２で片持状に固定
した。撓み量計測板６の先端部は突起状の穴１０ａの中
まで伸びており，この先端部の側面は穴１０ａの内面に
接触しないようにして，自由に上下動し得るように設け
た。なお，ここで，ブロック７，部材９，ボルト１２等
は，撓み量計測板６の一端部を片持支持しておくための
金型１に取付けた保持具を構成している。One end side of the flat plate-shaped deflection amount measuring plate 6 was cantilevered to the machined surface with a holding plate 11 and bolts 12. The tip of the flexure amount measuring plate 6 extends into the protruding hole 10a, and the side surface of the tip is provided so as not to come into contact with the inner surface of the hole 10a and to be able to freely move up and down. Here, the block 7, the member 9, the bolt 12 and the like constitute a holder attached to the mold 1 for cantileverly supporting one end of the deflection amount measuring plate 6.
【００２０】撓み量計測板６の裏面の根本側には市販の
歪ゲージ１３がはり付けられており，歪ゲージ１０は，
図示していない歪量計測器本体に連結されている。この
装置においては，撓み板部３が撓み量伝達棒５を介して
撓み量計測板６に繋がっているので，撓み量計測板６の
歪量は，圧力の大きさに比例して撓む撓み板部３の歪量
と対応している。そして，撓み板部３の厚みやブロック
７と押え部材９の内径の大きさ，撓み量伝達棒５の後端
部と撓み量計測板６の当接位置から撓み量計測板６の根
本部までの距離，撓み量計測板の寸法等を考慮して，撓
み量計測板６の歪量から撓み板部３に作用した圧力を換
算して常にすぐに正確に求めることができる。換算して
得た圧力は，数値として表示したり，グラフでモニタに
表示したりして，その圧力変動状態を知ることができ
る。A commercially available strain gauge 13 is attached to the bottom side of the back surface of the deflection amount measuring plate 6, and the strain gauge 10 is
It is connected to a strain amount measuring device body (not shown). In this device, since the bending plate portion 3 is connected to the bending amount measuring plate 6 via the bending amount transmitting rod 5, the bending amount of the bending amount measuring plate 6 is bent in proportion to the pressure. It corresponds to the amount of strain of the plate portion 3. The thickness of the flexible plate portion 3, the inner diameters of the block 7 and the pressing member 9, the contact position between the rear end portion of the flexible amount transmission rod 5 and the flexible amount measuring plate 6 to the base portion of the flexible amount measuring plate 6. In consideration of the distance, the size of the flexure amount measuring plate, etc., the pressure acting on the flexure plate portion 3 can be converted from the strain amount of the flexure amount measuring plate 6 and always immediately and accurately obtained. The pressure obtained by the conversion can be displayed as a numerical value or can be displayed on a monitor in a graph to know the pressure fluctuation state.
【００２１】撓み量計測板６の先端側の裏面には，温度
補償用の歪ゲージ１４をはり付けた。片持支持している
撓み量計測板６においては，撓み量伝達棒５が当接して
いる点よりも先端側は，撓み量伝達棒５で押されても変
形しない無変形部分となっているので，ここでの歪は，
温度変化によって撓み量計測板６が伸び縮みすることに
よる歪のみである。したがって，温度補償用の歪ゲージ
１４で計測した歪に基づいて，演算により温度変化を求
めたり，金型内圧力を演算で求める際に温度補償をし
て，金型内圧力をより正確に求めることができる。A strain gauge 14 for temperature compensation was attached to the back surface of the bending amount measuring plate 6 on the front end side. In the cantilevered flexure amount measuring plate 6, the tip end side of the contact point of the flexure amount transmitting rod 5 is a non-deformable portion that is not deformed even when pushed by the flexure amount transmitting rod 5. So the distortion here is
It is only the strain due to the bending amount measuring plate 6 expanding and contracting due to the temperature change. Therefore, on the basis of the strain measured by the temperature compensating strain gauge 14, temperature change is obtained by calculation, or temperature compensation is performed when the mold internal pressure is calculated, and the mold internal pressure is obtained more accurately. be able to.
【００２２】図３は，本発明の他の実施例を示す縦断面
図である。図３において，図１と同じ部分は図１と同じ
符号を付して，その説明は省略する。図３において，撓
み板部３は，中央部に設けた円形状の比較的に薄い部分
３ａと，その回りの比較的に厚い円形状の部分３ｂによ
って構成した。そして，金型１にねじ取付けしたブロッ
ク７の先端部に設けたリング状の突起７ａを厚い部分３
ｂの裏面に当接させた。このような形状にしたのは，撓
み板部３が振動しやすいようにし，キャビティ２内に鋳
込んだ溶湯に振動を与え，凝固時の金属組織がより良好
になるようにしたためである。FIG. 3 is a vertical sectional view showing another embodiment of the present invention. 3, the same parts as those in FIG. 1 are designated by the same reference numerals as those in FIG. 1, and the description thereof will be omitted. In FIG. 3, the flexible plate portion 3 is composed of a circular relatively thin portion 3a provided in the central portion and a relatively thick circular portion 3b around the circular portion 3a. The ring-shaped protrusion 7a provided at the tip of the block 7 screwed to the die 1 is provided on the thick portion 3
It was brought into contact with the back surface of b. The reason why such a shape is adopted is that the flexible plate portion 3 is made to easily vibrate, and the molten metal cast in the cavity 2 is vibrated so that the metal structure at the time of solidification becomes better.
【００２３】ブロック７の軸心中央部にはブッシュ１５
を取付け，撓み量伝達棒１５を軸線方向に摺動自在にガ
イドした。このようにしておくと，撓み量伝達棒５の位
置がずれることはなく，撓み量伝達棒５の先端部５ａは
常に薄い部分３ａの中心位置に当接していることにな
る。撓み量伝達棒５の先端部５ａは球面状にし，撓み板
部３に力が偏心して加わっても，先端部５ａが常に一点
になるようにした。一方，撓み量伝達棒５の後端部５ｂ
は円錐状または球面状にし，同様に点接触を保つように
した。A bush 15 is provided at the center of the axis of the block 7.
Was attached, and the deflection amount transmission rod 15 was slidably guided in the axial direction. By doing so, the position of the bending amount transmitting rod 5 does not shift, and the tip portion 5a of the bending amount transmitting rod 5 is always in contact with the center position of the thin portion 3a. The tip portion 5a of the deflection amount transmitting rod 5 is formed in a spherical shape so that the tip portion 5a is always one point even if a force is eccentrically applied to the bending plate portion 3. On the other hand, the rear end portion 5b of the deflection amount transmission rod 5
Was made to be conical or spherical, and similarly, point contact was maintained.
【００２４】歪ゲージ１３または，歪ゲージ１３と温度
補償用歪ゲージ１４に発生した歪を求める場合は，公知
のホイートストンブリッジ回路を用い，電気抵抗の変化
としてとらえて行う。このホイートストンブリッジ回路
を用いれば，歪ゲージが複数個の場合でも応用できる。
歪ゲージ１３を例えば２個用いる場合は，撓み量計測板
６に並べてはったり，表裏の両面にはったりすることが
できる。When the strain generated in the strain gauge 13 or the strain gauge 13 and the temperature compensating strain gauge 14 is to be obtained, a known Wheatstone bridge circuit is used and it is recognized as a change in electric resistance. If this Wheatstone bridge circuit is used, it can be applied even if there are multiple strain gauges.
For example, when two strain gauges 13 are used, they can be arranged on the deflection amount measuring plate 6 or can be placed on both front and back surfaces.
【００２５】温度補償用歪ゲージ１４の場合も，温度変
化によって生じた抵抗値の変化量を検知して行う。この
場合，この温度補償用歪ゲージ１４はダミーゲージとし
ての役割をし，加圧力による歪は拾わない。この場合
は，公知のアクティブ・ダミー法と呼ばれているブリッ
ジ回路を用いることができる。Also in the case of the temperature compensating strain gauge 14, the change amount of the resistance value caused by the temperature change is detected. In this case, the temperature compensating strain gauge 14 functions as a dummy gauge, and strain due to the applied pressure is not picked up. In this case, a bridge circuit known as an active dummy method can be used.
【００２６】なお，前記実施例においては，歪ゲージ１
３，１４を撓み量計測板６の裏面にはりつけた例を示し
たが，これは撓み量計測板６の表面にはりつけておくこ
ともできる。In the above embodiment, the strain gauge 1
Although the example in which 3, 14 are attached to the back surface of the deflection amount measuring plate 6 is shown, this may be attached to the front surface of the deflection amount measuring plate 6.
【００２７】[0027]
【発明の効果】本発明においては，金型のキャビティ側
の表面の一部に撓み板部を設け，撓み板部の中央部裏面
に先端が接している撓み量伝達棒を配し，撓み量伝達棒
の後端面に撓み量計測板を押付けた状態で配し，金型に
取付けた保持具で撓み量計測板の一部を支持し，撓み量
計測板の平面部に歪ゲージを取付けた金型内圧力計測装
置において，撓み量計測板を平板状とし，この平板状の
撓み量計測板の一端部を前記保持具に片持梁状に固定
し，撓み量伝達棒の後端面が撓み量計測板に当接してい
る位置よりも根本側で歪ゲージを撓み量計測板に取付け
たので，撓み量計測板は片持固定支持した状態になって
おり，撓み量伝達棒で撓み量計測板が押された場合に，
その力の大きさの違いによって，支点が移動することも
なく，歪変化が直線的にあらわれ，また，単純な梁の撓
み歪のために，歪や撓み量，および金型内圧力および圧
力変動を確実容易に計測，演算することができる。According to the present invention, the bending plate portion is provided on a part of the cavity side surface of the mold, and the bending amount transmitting rod whose tip is in contact with the back surface of the central portion of the bending plate portion is arranged. The flexure amount measuring plate was placed on the rear end face of the transmission rod in a pressed state, a part of the flexure amount measuring plate was supported by the holder attached to the mold, and the strain gauge was attached to the flat part of the flexure amount measuring plate. In the in-mold pressure measuring device, the deflection amount measuring plate is formed into a flat plate shape, and one end portion of the flat plate-like deflection amount measuring plate is fixed to the holder in a cantilever manner, and the rear end face of the deflection amount transmitting rod is bent. Since the strain gauge is attached to the deflection amount measurement plate at the base side of the position where it is in contact with the amount measurement plate, the deflection amount measurement plate is cantilevered and supported, and the deflection amount is measured with the deflection amount transmission rod. When the plate is pressed,
Due to the difference in the magnitude of the force, the fulcrum does not move and the strain changes linearly. Also, due to the bending strain of a simple beam, the strain and the amount of bending, and the pressure and pressure fluctuations in the mold Can be measured and calculated reliably and easily.
【００２８】撓み量伝達棒の後端面に撓み量計測板に当
接している位置よりも先端側で温度補償用歪ゲージを撓
み量計測板に取付けたので，無変形部分に温度補償用歪
ゲージを取付けたことになり，温度変化によって変化し
た撓み量計測板の伸びのみを正確に計測することがで
き，温度補償をすることができる。なお，従来は，全周
を支持した円板状の撓み量計測板を用い，その中央部に
撓み量伝達棒を当接していたので，撓み量計測板の全て
の部分に歪が発生しており，温度補償用歪ゲージを取付
けることはできなかったが，本発明においては，温度補
償用歪ゲージを容易に取付けることができるようになっ
た。Since the temperature compensating strain gauge is attached to the flexure amount measuring plate at the tip end side of the rear end face of the flexure amount transmitting rod with respect to the position in contact with the flexure amount measuring plate, the temperature compensating strain gauge is provided in the non-deformable portion. This means that only the extension of the flexure amount measuring plate that changes due to temperature changes can be accurately measured, and temperature compensation can be performed. Incidentally, in the past, a disk-shaped bending amount measuring plate supporting the entire circumference was used, and the bending amount transmitting rod was in contact with the central portion thereof, so that distortion occurred in all parts of the bending amount measuring plate. Therefore, the temperature compensating strain gauge could not be attached, but in the present invention, the temperature compensating strain gauge can be easily attached.
【００２９】また，撓み量伝達棒の先端部と後端部が先
細形状になっているので，撓み板部や撓み量計測板との
接触点が変化したり，ずれたりすることがなく，常に良
好な計測が行える。そして，前記した種々の利点の総合
的な結果として，金型内圧力および圧力の変動を，常に
確実容易にかつ正確に求めることができる。そして，例
えば，キャビティ内の溶湯に，例えば，数１００ｋｇ／
ｃｍ2 の大きい圧力と小さい圧力が交互に１０〜１００
Ｈｚ程度でパルス状に作用する場合であっても，特に抵
抗が発生する部分もなく，素早く応答するので，その圧
力変動を確実容易に検知することができる。Further, since the front end and the rear end of the bending amount transmitting rod are tapered, the contact points with the bending plate portion and the bending amount measuring plate do not change or deviate, and are always Good measurement is possible. As a result of the above-mentioned various advantages, the pressure in the mold and the fluctuation of the pressure can always be reliably, easily and accurately determined. And, for example, in the molten metal in the cavity, for example, several hundred kg /
Alternating large and small pressures of cm 2 are 10-100
Even when acting in a pulse shape at about Hz, there is no part where resistance is particularly generated and a quick response is made, so that the pressure fluctuation can be surely and easily detected.
【図１】本発明の１実施例を示す縦断面図である。FIG. 1 is a vertical sectional view showing an embodiment of the present invention.
【図２】図１の底面図である。FIG. 2 is a bottom view of FIG.
【図３】本発明の他の実施例を示す縦断面図である。FIG. 3 is a vertical sectional view showing another embodiment of the present invention.
【図４】従来技術における作用を例示した説明図であ
る。FIG. 4 is an explanatory view illustrating the operation in the conventional technique.
【図５】従来技術における作用の他の例を示した縦断面
図である。FIG. 5 is a vertical cross-sectional view showing another example of the operation in the conventional technique.
１ 金型 ２ キャビティ ３，３４ 撓み板部 ３，３２ 撓み量伝達棒 ６，３０ 撓み量計測板 ７ ブロック ９ 部材 １０ 穴 １３，３１ 歪ゲージ １４ 温度補償用歪ゲージ １５ ブッシュ DESCRIPTION OF SYMBOLS 1 Mold 2 Cavity 3,34 Bending plate part 3,32 Bending amount transmitting rod 6,30 Bending amount measuring plate 7 Block 9 Member 10 Hole 13,31 Strain gauge 14 Strain gauge for temperature compensation 15 Bush
Claims (4)
板部を設け，撓み板部の裏面に先端が接している撓み量
伝達棒を配し，撓み量伝達棒の後端面に撓み量計測板を
押付けた状態で配し，金型に取付けた保持具で撓み量計
測板の一部を支持し，撓み量計測板の平面部に歪ゲージ
を取付けた金型内圧力計測装置において，撓み量計測板
を平板状とし，この平板状の撓み量計測板の一端部を前
記保持具に片持梁状に固定し，撓み量伝達棒の後端面が
撓み量計測板に当接している位置よりも根本側で歪ゲー
ジを撓み量計測板に取付けた金型内圧力計測装置。1. A bending plate portion is provided on a part of a cavity side surface of a mold, and a bending amount transmitting rod having a tip in contact with the back surface of the bending plate portion is arranged. In a mold pressure measuring device in which the amount measuring plate is placed in a pressed state, a part of the bending amount measuring plate is supported by a holder attached to the mold, and a strain gauge is attached to the flat part of the bending amount measuring plate , The bending amount measuring plate is flat, and one end of this bending amount measuring plate is fixed to the holder in a cantilever manner, and the rear end face of the bending amount transmitting rod abuts against the bending amount measuring plate. An in-mold pressure measurement device with a strain gauge attached to the deflection amount measurement plate at the root side of the existing position.
当接している位置よりも先端側で温度補償用歪ゲージを
撓み量計測板に取付けた特許請求の範囲請求項１記載の
金型内圧力計測装置。2. The temperature compensating strain gauge is attached to the flexure amount measuring plate at the tip end side of the position where the rear end face of the flexure amount transmitting rod is in contact with the flexure amount measuring plate. In-mold pressure measuring device.
量伝達棒の先端中央部を先細形状にした特許請求の範囲
請求項１または請求項２記載の金型内圧力計測装置。3. The in-mold pressure measuring device according to claim 1 or 2, wherein a central portion of a tip of the bending amount transmitting rod, which is in contact with the back surface of the central portion of the bending plate portion, has a tapered shape.
棒の後端中央部を先細形状にした特許請求の範囲請求項
１ないし請求項３記載の金型内圧力計測装置。4. The in-mold pressure measuring device according to claim 1, wherein the central portion of the rear end of the bending amount transmitting rod that is in contact with the bending amount measuring plate is tapered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9623394A JPH07306104A (en) | 1994-05-10 | 1994-05-10 | Pressure measuring device in metal mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9623394A JPH07306104A (en) | 1994-05-10 | 1994-05-10 | Pressure measuring device in metal mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07306104A true JPH07306104A (en) | 1995-11-21 |
Family
ID=14159516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9623394A Pending JPH07306104A (en) | 1994-05-10 | 1994-05-10 | Pressure measuring device in metal mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07306104A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014142330A (en) * | 2012-12-28 | 2014-08-07 | Seiko Instruments Inc | Pressure sensor |
-
1994
- 1994-05-10 JP JP9623394A patent/JPH07306104A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014142330A (en) * | 2012-12-28 | 2014-08-07 | Seiko Instruments Inc | Pressure sensor |
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