INTERNAL LATCH LOCK Typical Application Design Guidelines Basic Selection and Application Design Guidelines 1.
Select the appropriate Internal Latch Lock size – 28mm diameter (small), 34mm diameter (medium), 45mm diameter (large) or 60mm diameter (extra) based on the width of the mold base, as indicated in the chart on page 123. However, large molds, thick plates or heavy load applications may require the next largest size assembly than is specified. 2. S elect the appropriate travel range from the two choices for each size in the table on page 123. This selection is based on the specific application requirements for the amount of travel that must occur at one parting line prior to the latch being released. The total travel requirements are based on the amount needed for the application as explained above, plus 3mm (.12”) minimum additional allowance. This added 3mm minimum will make sure the full required travel has occurred before the latch lock starts its releasing action. 3. S elect the appropriate length for the center puller pin from the two choices for each size in the chart. The length of the pin is determined by the specific application including the mold base plate thicknesses, where the pin will be mounted, etc. If possible, the center puller pin should be mounted in the support plate. However, some applications require the center puller pin to be mounted in the bottom clamping plate. This will depend on the travel or the length of the split sleeve component which controls the travel and the plate thicknesses in the mold base. 4. The answers to the above items (1-3) should establish a specific item number assembly from the table on page 123. 5. A minimum of four assemblies are recommended per mold. However, for larger molds, thick plates, or an application where loads are near maximum, additional assemblies and/or next largest size assemblies may be required. An application must never exceed the maximum recommended load values. A balanced load must be maintained to avoid cocking and binding which could cause severe overloading. Only one size latch lock assembly should be used in each mold base. 6. T he center puller pin should be counterbored into its mounting plate 4mm (.157”) minimum for most applications, as shown in the drawings at right. This counterbore aligns the center puller pin with the other components in the assembly.
U.S. Patent No. 5,494,435
7. The most common applications for the latch locks are for the DME AX-Series stripper plate mold bases. However, many other types of stripper plate mold bases can also be used with this internal plate latching mechanism. It is important to make sure that the leader pin lengths in all applications are long enough to fully engage the stripper plate through its full travel. The latch lock mechanism latches two plates together but is not intended to provide guidance. Instead, it relies on the leader pins in the mold for proper alignment and support of the actuated stripper plates. 8. In the fully latched position the Internal Latch Lock mechanism will allow movement of approximately 0.4mm (.016”) for the 28mm diameter and 34mm diameter assemblies and approximately 0.5mm (.020”) for the 45mm and 60mm diameter assemblies. 9. Injection molding machine mold opening speed may have to be reduced in order to make sure that excessive shock loading does not occur. 10. The Internal Latch Lock is not recommended for severe load applications. 11. The Internal Latch Lock must not be exposed to temperatures that exceed 150°C (300°F) at any time. 12. Lubricate all metal-to-metal contact areas initially and periodically as required. A good grade of moldmakers non-melting type grease for the appropriate temperature should be used. 13. A n optional sleeve can be added to the latch lock that provides two additional functions. However, this optional sleeve is not required for the latch lock function. The optional sleeve can be added to incorporate guided ejection and/or normal ejector assembly return functions in the mold. Refer to page 127 for specific information regarding this sleeve option.
Internal Latch Lock application with center puller pins mounted in the support plate. This is typically done in applications where the travel is shorter and/ or when mold plates are thicker. DME AX-Series mold base is shown in this typical application.
Internal Latch Lock application with center puller pin mounted in the bottom clamping plate. This is typically done in applications where the travel is longer and/or when mold plates are thinner. (Some applications may require a thicker than standard bottom clamping plate.) DME AX-Series mold base is shown in this typical application.
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