vertical type three plate multi-cavity injection mold

   
 
injection mold (vertical type)  
Figure 1 is an example of a basic vertical type three plate multi-cavity injection mold, however, you are not limited to three plates. The mold does not require heater elements or temperature controllers. The molding temperature is fully controlled by the injection press it is running in.  
 

Molding Procedure: The press opens the mold. It remains in the press. Center plates are separated by the stripper bolts and hang from the top plate. (However, some core bars or plates may be designed to be removed to retrieve the finished molded parts.) When bonding to metal inserts, they are placed into the cavities at this time. The mold is closed by the press and the fully automated injection cycle begins. A large ram or screw forces preheated uncured rubber through the injection nozzle, through the mold's runner system, down through the "sprues" and into the cavities. The uncured rubber is then forced into the shape of the cavity in the mold. A slight excess of material flows out of the cavity, along the gates and vents. The mold remains closed until the rubber is cured, completing the cycle.

 
 
injection mold (horizontal type)  
Figure 2 is an example of a basic horizontal type two plate multi-cavity injection mold. In general, you are limited to two plates. Again the mold does not require heater elements or temperature controllers. The molding temperature is fully controlled by the injection press it is running in.  
 

Molding Procedure: The molding procedures for horizontal and vertical molds are very similar. The main differences are:

  • The lack of sprues in the two plate design. Cavities are normally filled from an injection point along the cavity parting line.
  • Often, parts can be ejected and swept out of the mold by the press brushes.
  • Utilizing the press brushes and ejector system, molds can complete the cure, eject the cull, runner and parts, brush off any remaining rubber and begin the next cycle without the intervention of the press operator.
  • Less rubber lost to the injection runner system.

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