ToolTex: Hot Air Cold Staking

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Hot Air Cold Staking

Special situations require special solutions. Hot air/cold staking is used in place of heat staking in order to get repeatable and tight staking. It is used in place of an ultrasonic system when there is concern about damage to the reverse side of the part. Also, it is more cost effective than ultrasonic welding when there are multiple staking points within a confined area.Standard Flared Stake

Standard Flared Stake
The standard flared stake satisfies the requirement of most applications. This stake is recommended for bosses with an O.D. of 1/16 inch (1.6mm) or larger, and is ideally suited for low density, nonabrasive amorphous plastics.

Spherical Stake
The spherical stake is preferred for bosses with an O.D. less than 1/16 inch (1.6mm), and is recommended for rigid crystalline plastics with sharp highly defined melting temperatures, for plastics with abrasive fillers, and for materials that degrade easily.

Hollow Stake
Bosses with an O.D. in excess of 5/32 inch (4mm) should be made hollow. Staking a hollow boss produces a large, strong head without having to melt a large amount of material. Also, the hollow stake avoids sink mark on the opposite side of the component, and enables the parts to be reassembled with self-tapping screws should repair and disassembly be necessary

GENERAL DESCRIPTION
A hot air/cold staking system functions as follows:
A part is placed onto the support fixture. Once it is in place a nozzle introduces hot air onto the boss for a predetermined length of time, heating the staking points of the part. When the cycle is over, a cold swaging tool, which is controlled by pneumatics, comes down and folds over the heated materials, securing the part.