Spirol Brass Inserts Used To Mould Components

Spirol Industries' Series 13 self-tapping brass inserts have been used by a moulding company to mould components for high-voltage controls. The inserts are able to withstand a high torque load and are resistant to the vibration caused by constant low-frequency switching when installed within plastic parts. The plastic housing has been designed to resist extremely high temperatures during normal operation and, accordingly, the plastic composition has a high percentage of glass and mineral fillers to withstand the harsh environment.

The plastic's resistance to melting had made it difficult for the moulder to install brass inserts using heat or ultrasonic equipment. However, without properly installed inserts, the plastic assembly failed, causing short circuits. Spirol recommended that the moulder change to Series 13 self-tapping inserts. The hole size in the moulded part did not require any modification to accommodate the new self-tapping inserts and it was also possible to utilise its existing X-Y fixture tooling for part positioning.

Spirol's model TA automatic insert driver was installed in place of the moulder's existing ultrasonic unit - almost a direct bolt-in - and production resumed immediately. The thread-cutting inserts were said to be simple to install into the hard plastic component and they exceeded the performance requirements of the assembly.

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