Browse Prior Art Database

Oscillating Punching Mechanism

IP.com Disclosure Number: IPCOM000040512D
Original Publication Date: 1987-Nov-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Long, DC: AUTHOR [+4]

Abstract

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.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 56% of the total text.

Page 1 of 2

Oscillating Punching Mechanism

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 = 0.0002 sec table speed, v = 1 in/sec v = wmax/ t Oscillating of the punching mechanism will eliminate such a time dependency.

(Image Omitted)

With an oscillating mechanism the punched material will still move at a constant speed (Fig. 2A). The velocity of the table and greensheet is constant with respect to the ground. The punching mechanism will oscillate about a fixed position with respect to the ground (Fig. 2B). The relative velocity between the punching mechanism and the material is the difference of these two velocities (Fig. 2C). During the half cycle while the punch is traveling with the same velocity as the sheet, their relative displacement is zero and the hole is punched as if the material were station...