3.高圧クランプ後に角度が90°を超える場合の原因と対策, 逆ヒンジが発生する

1.金型開口部の油圧リングの面積が小さすぎる
型 型開力＝型開油圧リング面積×型開油圧
最大圧力が決まっている場合に型開力を大きくしたい場合, 金型開口部の油圧リング面積を増やすことしかできません, シリンダー径を大きくするか、ピストンロッド径を小さくすることで、型開き油圧リング面積を増やすことができます。.

2.型の開口部とオイルの隙間が小さすぎる
型開き部にて, 油圧緩衝スリーブとシリンダーフロントカバーの内穴との隙間が小さすぎるため, 圧力油がシリンダー開口部のキャビティに入るのが遅い、または入りにくい, 最大の型開力が得られない.
油圧緩衝スリーブとシリンダーフロントカバーの内穴とのマッチングギャップを大きくする, 圧力油がシリンダー開口部のキャビティに素早く入り、一定の衝撃で型を開く力を形成できるようにします。, 金型が開くときに一定の衝撃が生じる可能性があります.

3.高圧クランプ後に角度が90°を超える, 逆ヒンジが発生する
The design of the hinge parameters and the stroke and installation position of the clamping cylinder determine the end position of the small hinge during the final high-pressure clamping and form a angle. The designed angle must ensure that the machine installed within the cumulative tolerance range of each part processing The angle must be absolutely less than 90°.
Once the angle exceeds 90°, the small hinge will appear reverse hinge. At the moment when the mold is opened, the hook hinge and the long hinge are leaned in a straight line to generate greater clamping force. 最後に, the mold opening force is not enough to overcome the increase. Due to the deformation force generated by the large clamping force, the mold opening cannot be completed instantly.

4. The mold opening force cannot overcome the excessive deformation force
いつ マシーン hinge of the machine reaming machine is designed, the magnification ratio of the machine hinge when it produces the predetermined clamping force to be achieved has also been determined. これを踏まえて, the required thrust of the mold clamping cylinder can be designed to determine the diameter of the clamping cylinder. The cylinder must have sufficient mold opening force. For sufficient mold opening force, the larger the cylinder diameter, the better.
But the cylinder diameter is too large, which results in too much cylinder thrust during mold clamping, which makes the clamping force overload (when the mold adjustment is not good), the deformation force of the machine hinge is too large, 型を開ける力が過剰な変形力に勝てず、型を開けることができなくなります。. .
この場合, 通常、高圧のクランプ圧力と流量を制限することで、クランプ力の過負荷を防ぐことができます。. 金型を調整するときは辛抱強くしてください, より低いクランプ圧力を使用して、可能な限りクランプ力を調整します。.

5. 低い型開圧力と低い流量, その結果、型開きの衝撃が小さくなります
型開圧力が低く、流量が少ないため, 型開き推力が小さい, 機械のヒンジの変形力に勝てない. 特に, サーボ制御システムによって提供される第 1 段階の型開き流量が小さい, 型開き推力が小さい, 型を開けるのが難しくなります.
This problem can increase the mold opening impulse by modifying the controller’s PID and mold opening slope.

6. The temperature rise after the mold is installed and the pressure is tested, which makes it difficult to open the mold
After a period of time of pressure test, the mold heats up and expands and the clamping force increases, which makes it difficult to open the mold. Pay attention to timely adjust the modulus to make the clamping force return to the original value to avoid mold opening failure.

7. The downtime after installation and clamping is too long, resulting in failure to open the mold
After the mold is locked, the downtime is too long, which leads to the complete disappearance of the lubricating oil film of the machine hinge, and the deformation of the machine hinge further increases, which makes it impossible to open the mold.
したがって, reduce the downtime of the mold as much as possible, and remember to open the mold before shutting down, and do not shut down with the mold locked.

8. Back pressure of mold opening, resulting in insufficient mold opening impulse
Setting the mold opening back pressure in the mold opening section of the oil circuit also results in insufficient mold opening impulse. If this situation is found, the mold opening back pressure is cancelled.

9. The frictional resistance in the hinge is too large, resulting in mold opening resistance
The friction resistance between the large pin shaft and the steel sleeve in the injection molding machine hinge is too large, resulting in the need for greater mold opening force to overcome its friction resistance:
(1) The edge of the oil groove in the steel sleeve is not deburred, causing the burrs to wear into particles and enter the mating surface of the large pin shaft and the steel sleeve, and cause the mating surface to wear or burn to the mating surface.
In order to avoid this problem, it is required to trim the burrs and smooth the parts after processing these parts. Check again during installation and clean the surfaces and apply grease before installation.
(2) If there is insufficient lubrication or lubrication failure, it will also cause excessive friction resistance. 現時点では, check whether the lubricating oil circuit is normal and whether the lubricating pump is normal.