An injection molding machine has two mold plates: one is stationary, called the fixed mold plate; the other is movable, called the moving mold plate. The mold is fixed to these two mold plates by screws and pressure plates. When the mold opens, the moving mold plate moves, thereby opening the mold.
Once the mold is manufactured, injection molding is required. The mold is then loaded onto an injection molding machine to begin producing the product. However, there are many models of injection molding machines, each with its own parameters. The mold design must meet the requirements of the injection molding machine model provided by the customer; otherwise, production will be impossible.
Injection molding machines have many design parameters. Below, we will focus on several parameters related to molds, which readers should pay attention to when designing molds.
1. Injection volume
Injection volume refers to the maximum mass (or volume) of molten plastic that an injection molding machine can inject in a single operation, representing the maximum injection capacity of that model of injection molding machine. The amount of molten plastic used in a single mold design must be less than the injection volume of the injection molding machine. Otherwise, the product will not be fully filled, and production will be impossible.
2. Clamping force
The clamping force exerted by the injection molding machine on the mold plate when the mold closes is what causes the problem. The clamping force required for the molded product during molding must be less than the rated clamping force of the selected injection molding machine. Otherwise, molten plastic will easily leak from the parting line, resulting in flash.
3. Tie rod spacing
There are four tie rods in the dead corners of the fixed and moving platens of the injection molding machine. Their function is to ensure that the injection molding machine has sufficient strength and rigidity, and to be responsible for the sliding platen. However, they often limit the external dimensions of the mold because the mold is hoisted in from the middle of the tie rods during installation.
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