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            Injection mould machine English | 中文
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            Contact Us

            Name: Haijiang Sales Team
            Tel: +86-574-87994054
            Fax: +86-574-56877329
            Mobile: +86-18658255281
            E-mail: admin@taihong-machine.com
            Add: 707,Minghui Dasha 666#,Jinyulu,Yinzhou area, Ningbo city,China
            Skype: haiflymachinery
            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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