Runner Cross Section Guidelines
Flow efficiency in runners increases as the cross
section approaches a circular shape. The round runner configuration shown
in Figure 15 requires machining both halves of the mold across the parting
line. Typically, a compromise is reached with the half-round approach.
Trapezoidal and rectangular runner systems are not optimum, as most of the
flow takes place in the circular channels (dark shaded on the diagram),
and the rest of the runner cross section is not used efficiently.
Runner Design Guidelines
Half-Round Runner Design
Usually a 5 degree draft angle on the flat sides
of the runner to ensure good ejection. The bottom of the runner should be
fully radiused.
Determining Sizes Bases on Provided Full Round Dimensions
When provided with full-round runner sizes and tool
must use another cross section the simplest method for determining the
dimensions for the alternate shape is to circumscribe a circle of the
recommended diameter with the alternate shape.
Figure 16
Half-Round Runner Design
the question. This
is the answer to the question. This is the answer to the question. This is
the answer to the question. This is the answer to the question.
This is the answer to the question. This is the answer to the question.
This is the answer to the question. This is the answer to the question. This
is the answer to the question. This is the answer to the question. This is
the answer to the question. This is the answer to the question.
This is the answer to the question. This is the answer to the question.
This is the answer to the question. This is the answer to the question. This
is the answer to the question. This is the answer to the question. This is
the answer to the question. This is the answer to the question.
This is the answer to the question. This is the answer to the question.
This is the answer to the question. This is the answer to the question. This
is the answer to the question. This is the answer to the question. This is
the answer to the question. This is the answer to the question.
This is the answer to the question. This is the answer to the question.
This is the answer to the question. This is the answer to the question. This
is the answer to the question. This is the answer to the question. This is
the answer to the question. This is the answer to the question.
This is the answer to the question. This is the answer to the question.
This is the answer to the question. This is the answer to the question. This
is the answer to the question.
This is the answer to the question. This is the answer to the question.
This is the answer to the question. This is the answer to the question. This
is the answer to the question. This is the answer to the question. This is
the answer to the question. This is the answer to the question.
This is the answer to the question. This is the answer to the question.
This is the answer to the question. This is the answer to the question. This
is the answer to the question.
|
