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Manufacturing:
Metal Casting
Metal
Casting Techniques - "H" Process
Molding
This process utilizes a
horizontal, controlled pouring process for
the repetitious production of castings.
It makes use of rigid, double-sided molds
produced by coreblowing machines. Each mold
carries a half casting impression on each
side, complete with runner bar, feeder head
and ingates.
Molds, when clamped together
horizontally, form a pouring system of a
top continuous runner and feeder bar. This
runner/feeder bar is opened up at one end
to form a pouring basin. Each mold is designed
so that when the string of molds is poured,
control of the metal flow is obtained.
The first mold is poured
and is full before the metal proceeds to
fill the second mold. This procedure of
mold filling ensures a "flow feed"
of each casting as all metal must pass through
the feeder heads of the preceding castings.
Maximum yield of metal is obtained.
The horizontal clamping
arrangement of the molds in the "H"
process achieves the lowest possible ferrostatic
casting pressure. This reduces the strain
on mold parting joints, resulting in close
control of casting dimensions and a minimum
of casting cleaning. Presently the process
has been applied to most cast metals.
Advantages
- Close control of casting
dimensions.
- Reduction in casting
cleaning costs.
- The molds can be produced
on core machines and from any of the known
core or mold binder technologies in use
today.
Disadvantages
- Mold size with this
process is limited to available equipment.
- Productivity is controlled
by existing production of molds, molding
handling systems, and the pouring of mold
assemblies.
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