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The
Reason For Hemming Wire Mesh |
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Hems are commonly used to
re-enforce the edges of wire mesh,
hide imperfections and provide a safer
(smother) edge to handle. When a design
calls for a safe, even edge the added cost of material
and processing of a hem is often preferable to other
wire mesh edge treating
processes. Doubling a hem can create an edge perfectly
safe to be handled without regard for the initial
wire mesh edge quality.
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This Shape is also referred to as a "Double Fold" |
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Hems can even be used to
double the thickness of wire mesh
in areas of a part which may require extra
support. |
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How
Wire Mesh is Hemmed |
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The term hemming has its
origins in wire cloth fabrication
where the edge of the mesh
is folded back on (over)
itself and then flattened (coined)
shut. |
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The most common Wire Mesh Hem is the "Single Folded
Flat Hem" |
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When working with a Brake
Press (often referred to as a "Press
Brake") hems are always created in a two step
process: |
- Create a bend
with Acute Angle Tooling in the
mesh,
30° is preferable but 45° will work for some
circumstances.
- Place the acute bend
under a flattening bar and apply enough pressure to
finish closing the wire mesh
bend.
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The first step is done the same as any regular acute
angle bend. The second stage of the hemming process requires some additional
know how on the part of the Brake Press operator and tool designer because the
angle of the wire mesh, the flattening bar wants to
slide down and away from the wire mesh material. In
addition the work piece wants to slide out from between the bars. These two
forces are known as thrust forces. |
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This requires that the flattening die be designed
to withstand the thrust forces and remain flat. In addition it requires that
the operator put a forward force against the wire mesh
to prevent it from sliding out of the die. These forces are most prominent on
thicker work pieces with shorter flanges. |
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[Technical
Reference
Index]
[Woven Wire
Main Index]
[Wire
Wire Mesh Products] |
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Screen Technology Group, Inc |
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33008 NE Washougal River Road, Washougal
WA 98671 USA |
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Screen Technology Group,
established in 1988 With our success built on
providing a level of customer service that is
second to none, competent technical assistance,
quality materials at competitive prices,
properly package every order, always ship promptly
according to schedule. |
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Screen Technology Group, Inc.
All Rights Reserved.
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Last modified:
August 28, 2016 |
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