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 Joining method takes to dissimilar materials
Structural bonding is replacing mechanical
fastening-bolt, screw, clip or weld-throughout the assembly process. Structural
adhesives cover the entire bond area, often creating a stronger bond than
traditional, intermittently spaced fasteners.
Structural adhesives are designed to bond metal to
metal or to plastic, fibreglass or other substrates. Typical adhesives include
two-component epoxies or modified acrylics. In many cases, these high-viscosity
adhesives have various mix-ratios, a rapid cure time, and require special
handling for optimum performance.
Structural bonding is particularly appealing for
replacing welds-no more bubbles or extra work to repair areas for cosmetic
reasons. Some structural adhesives can be used on clean or painted surfaces,
while others are effective on oily metal.
Metering, mixing and
dispensing
The equipment and method of metering, mixing and
dispensing the structural adhesive are as important as the adhesive itself.
Integrated Dispensing Systems offers meter
/ mix / dispense systems that are ideally suited for structural bonding.
The
Program-A-BeadŽ 692 system is a robotic-integrated system that meters, mixes and
dispenses precisely sized beads of two-component adhesives or sealants for
high-volume robot or automated structural bonding applications.
Servomotor powered, the advanced system's positive
displacement meter electronically controls the flow rate of the mixed material
through all facets of the dispense process. With its servo drive and Device Net
controls interface, the dispense rate is varied in conjunction with the robot
tool tip speed. This is especially useful in making corner beads consistently
sized with straight bead paths for a constant bead profile regardless of
contour.
 Mounted on the end of the robotic system's arm, a
Snuf-Bak™ dispense valve with
No-Flush™ disposable mixer /
applicator nozzle assures thorough material mixing and eliminates the need for
solvent flushing.
 Constant
flow
Sealant's
SeeFlo®
494 system is a bead-dispensing system for precisely proportioned
two-component structural adhesives, ideal for applications where
a constant
flow rate is preferred. A reliable, versatile and durable dispense system,
SeeFlo® 494 is designed to robotically
or manually dispense a high-quality, mixed, uniform bead of two-component
structural adhesive (epoxy, polyurethane, or acrylic) onto galvanized sheet
metal, fibreglass-reinforced plastic, or sheet-moulded compound parts.
The system accurately controls the flow rate of mixed
material at a preset rate, thereby dispensing a precise uniform bead of
adhesive throughout the specified bead path. The system's positive-displacement
volumetric-metering pumps feature abrasion-resistant seals and a "quick
service" seal cartridge. SeeFlo® 494
provides consistent flow capability. Its Snuf-Bak™ dual-component dispense gun
features a No-Flush™ disposable,
no-moving-parts mixer nozzle.
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