Extruded Tapped Hole Sheet Metal

The minimum distance from an extruded hole to a bend is three times the material thickness plus the bend radius.

Extruded tapped hole sheet metal. Prepunched or extruded holes on the sheet are threaded through a coordinated rotation of the turret press autoindex station and ram stroke. They are used in thin materials. Extruded tapped hole u nuts push the workpiece material downward to create a tapped hole. First prevailing off torque is an indication of locking torque and resistance to vibrational loosening and is favorably high for extrude tite screws in thin sheet metal.

The following illustration shows the extruded hole geometry. Creating an extruded hole using a punching process requires extreme pressure force. Therefore the minimum distance between the extruded hole to edge if maintained. Design for manufacturability sheet metal guidelines bends for the ease of manufacturing multiple bends on the same plane should occur in the same direction.

Avoid large sheet metal parts with small bent flanges. Extruded holes very close to the part edge can lead to sheet metal deformation or tearing. Performance in extruded holes is slightly higher than in drilled holes. Tap fix screws for extruded holes in light gauge steel this article provides tap fix hole size recommendations for metals using light gauge punched extruded materials.

A pre punched hole is required as a one hit pierce and extrude gives poor hole quality and has limited adjustment on the machine. The tooling produces a full range of threaded holes in. In low carbon steel sheet metal the minimum radius of a bend should be one half the material thickness or 0 80 mm. Extruded hole to part edge b 3t d 2.