Sub-runner in metal injection molding mould
refers to a mainstream between sprue and gate. It is the transition for melting
material flowing from sprue into cavity and
through section area change to material diversion in pouring system. It
can make material get a smooth transformation.
Section Design
A. General design is circular
B. Considering better process, it is usually designed to U shape, V shape, trapezoidal shape or hexagon shape
C. Shape and size of section should be based on the volume, wall thickness, shape of products as well as process properties, injection speed and length of runner.
2. There are two layouts for runner: balanced feed and non-balanced feed. Balanced feed is to ensure each feeding throat fed evenly at the same time. The unbalanced feed refers to not feeding each feeding throat evenly at the same time. Generally it is evaluated through mold flow analysis.
Section Design
A. General design is circular
B. Considering better process, it is usually designed to U shape, V shape, trapezoidal shape or hexagon shape
C. Shape and size of section should be based on the volume, wall thickness, shape of products as well as process properties, injection speed and length of runner.
2. There are two layouts for runner: balanced feed and non-balanced feed. Balanced feed is to ensure each feeding throat fed evenly at the same time. The unbalanced feed refers to not feeding each feeding throat evenly at the same time. Generally it is evaluated through mold flow analysis.
Original
article link：Metal
Injection Molding http://www.zcmim.com/article/metal-injection-molding-mimms_1.html
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