Oscillating Punching Mechanism
Original Publication Date: 1987-Nov-01
Included in the Prior Art Database: 2005-Feb-02
A mechanism has been proposed for improving the quality of via holes punched in a constantly moving greensheet used in the fabrication of multilayer ceramic substrates. The proposed tool would oscillate the punch head or the greensheet while the greensheet is moving through the punch. This provides a relative displacement of zero during the time necessary to punch the via. (Image Omitted) The relationship of flying speed and hole elongation is given in Fig. 1. In punching vias 1 with a stationary punch 2 while the greensheet material 3 is moving, the flying speed of the material is depenupon the engagement time of the punch and the elongation 4, wmax, where: if maximum distortion, wmax = 0.0002 in punch engagement time, t = 0.