Page 45 - MetalForming April 2011
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Contact switch
Proximity switch
Light beam emitter
Light beam receiver
units always reverse direction at press bottom-dead center, stampers must configure the PLC of their press con- trols or die-protection center to read
the sensor output when the press ram is on bottom. For example, “look on” or “ready” at 175 deg., and “look off” at 185 deg.
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MetalForming/April 2011 43
Plunger
Fig. 4—To combat the problem of incom- plete-depth threads, use a sensor to look for the tap at the end of its stroke.
Sensor Locations
Any idle progression before the IDT station presents an ideal location for a hot-pilot arrangement to detect the presence of a simple pierced or extrud- ed prehole. With dies that lack idle sta- tions, stampers can install a hot-pilot system that shares another progres- sion that may be performing other operations.
Detecting successful tap penetra- tion of course must be done in the tap- ping station above or below the tapped hole, depending on tapping-device ori- entation.
Note: There’s an astounding amount of comprehensive sensor know-how available in the marketplace, so this article intends only to motivate die designers and stampers to consider the use of sensors for IDT applications.
Happy Tapping! MF
Tooling Technology
