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      Injection mould machine English | 中文
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      Name: Haijiang Sales Team
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      QQ: 2692648818
      SKYPE: haiflymachinery QQ: 2692648818

      mould constrution

      Introduction Of Mould

      Function of Major Parts
      You will learn about the names and functions of major parts used for an ejection system.
      A push back pin and a coil spring are used for regular molds, whereas a push back pin and a gas spring are sometimes used for large size molds.
      This figure illustrates an example of a large mold. 

      Ejector Stopper (Stroke End Pin)

      A block that stops an ejector plate from going forward [ stop pin]

      Sprue Lock Pins

      A pin has the edge of which is undercut to pull a part in mold opening and remove a sprue from a sprue bush.
      After mold opening, this pin will function as an ejector pin and ejects the sprue from a aprue bush. Also it releases gas contained in molten plastic.

      Ejector Plate

      Also called a push plate. A plate that supports an edge of an ejector pin or a push back pin to eject a part from a mould.
      It is ejected by an ejector device of a molding machine, and returned to the original position when the edge of a push back pin collides with a cavity plate during mold clamping.

      Stop Pins

      A stopper installed to keep an ejector plate horizontal or prevent the ejector plate from retreating too far and damaging a core adaptor plate.

      Ejector Guide Pins / Ejector Guide Bush

      An ejector guide pin is also called a push plate guide pin and functions as a guide for sliding of an ejector plate.
      Because an ejector guide bush slides, a hard material is used.
      An ejector guide bush is also called a push plate guide bush. It is a cylindrical part used to determine the position by matching the ejector guide pin.

      Push Rods

      A shaft linked to the force (hydraulic or mechanical) of the molding machine in order to get the ejector plate to work.

      Gas Spring / Gas Spring Holder 

      A gas spring forcibly pushes back an ejector plate. The strength of the spring is adjusted by adjusting the filling pressure.
      When using a gas spring, make sure to avoid high temperature (heat may expand gas, deteriorating the original functions of a gas spring).
      Calculating Filling Pressure
      To figure out filling pressure (
      P) from early load (Wo):
      P = 100 * Wo /C (C: constant)
      To figure out corresponding spring constant (
      K) from filling pressure (P) and gas spring constant (G):
      K =G * P / 100
      To figure out force by displacement (
      x) from the top D.C. of the piston rod (W):
      W = P (Gx + C)
      * See the catalog of each manufacturer for constant (
      C) and gas spring constant (G).
      A gas spring holder is a block used to fix a gas spring to an ejector plate.
      Counter bore process for a bolt installation hole, for it also functions as an push rod.

      Gas Spring / Gas Spring Holder 

      A gas spring forcibly pushes back an ejector plate. The strength of the spring is adjusted by adjusting the filling pressure.
      When using a gas spring, make sure to avoid
      high temperature (heat may expand gas, deteriorating the original functions of a gas spring).

      Calculating Filling Pressure
      To figure out filling pressure (
      P) from early load (Wo):
      P = 100 * Wo /C (C: constant)
      To figure out corresponding spring constant (
      K) from filling pressure (P) and gas spring constant (G):
      K =G * P / 100
      To figure out force by displacement (
      x) from the top D.C. of the piston rod (W):
      W = P (Gx + C)
      * See the catalog of each manufacturer for constant (
      C) and gas spring constant (G).
      A gas spring holder is a block used to fix a gas spring to an ejector plate.
      Counter bore process for a bolt installation hole, for it also functions as an push rod.

       

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