Freeman's
Guide To Core Vents
Part 1 of 2: Core Vent Overview
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directly to Part 2: Freeman's Line of Core Vents
Core
box air release vents enable "core blowing" equipment
to effectively fill the core box with sand, and allow
for
the safe escape of gases, heat, and air during core manufacturing.
Freeman offers a large selection of vents in brass, brass
alloy, steel,
and aluminum for a wide range of applications.
When
selecting the proper core vent for an application, please
follow these guidelines...
#1 - Type of Metal:
Three basic metals are offered: Brass, Steel, and Aluminum.
- Brass
is a softer metal which makes it easier to contour, remove
from the core box, and clean.
- Brass
Alloy (SAE-430-B), available only with Ventistamp
core vents, features higher wear resistance than steel.
- Steel
vents offer greater wear resistance, can withstand higher
temperatures, and match metal with steel core boxes for
uniform heating and cooling.
- Aluminum
vents are popular for Styrofoam molding applications and
offer many of the same advantages as the steel vents.
#2
- Style of Vent:
Nearly
all of
the core vents sold are one of the four styles: Shalco
Super Vents, Ventistamp Zanatta vents, Slotted vents, and
Screen vents.
Shalco
Super Vents
(43%
opening rate, self cleaning)
|
Ventistamp
Zanatta Vents
(one
piece construction, very hard metal alloy, self-cleaning)
|
Slotted
(can be ground to contour with
surface of core box, ~13% opening rate)
|
Screen
Mesh
(~30% opening, designed for flat areas)
|
#3
- Slot Width/Screen Mesh:
The
width of the slot or the size of the mesh required is determined
by the size of the sand (mesh) being used in the construction
of your core. The width/mesh of your vent must not be greater
then the sand mesh in order to hold the sand in the core box
while permitting the air to escape.
#4
- Dimensions:
- Depth
– is based on the depth of the shoulder created by
the step drill (insert drill).
- Head
Thickness – affects the ability to contour
the vent to the tool surface. The thicker the head the more
contouring can be done and the thinner the head the less
likely it is to clog with binders.
- Diameter
– is determined by the size of the area requiring
venting and the number of vents preferred in the particular
location on the core box.
Continue
to Part 2 of 2: Freeman's Line of Core Vents
|
