Browse Prior Art Database

Lapping Process

IP.com Disclosure Number: IPCOM000074759D
Original Publication Date: 1971-Jun-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Narken, B: AUTHOR

Abstract

In this process improved flatness and less contamination in lapping glass and ceramic surfaces are obtained by using a high-viscosity abrasive vehicle. This causes the part to ride higher than in conventional lapping due to hydroplaning, which allows freer motion of abrasive and removed material. Thus, the common problems of abrasive breakdown and surface contamination are minimized.

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Lapping Process

In this process improved flatness and less contamination in lapping glass and ceramic surfaces are obtained by using a high-viscosity abrasive vehicle. This causes the part to ride higher than in conventional lapping due to hydroplaning, which allows freer motion of abrasive and removed material. Thus, the common problems of abrasive breakdown and surface contamination are minimized.

The space between the lapping wheel surface 10 and the part surface 12 is greater than the diameters of the abrasive particles, as shown in B, which results in an abrasion by particles stacking or bunching and momentary impingements. The frequency or likelihood of abrasive bunching is the same across the entire surface and is not effected by abrasive breakdown, which usually causes crowning of the surface and rounding of the edges and corners. In contrast, the abrasive action for conventional lapping, as illustrated in A, restricts abrasive entry at 11 and confines the abrasive particles and removed material between surfaces 10 and 12, which causes the abrasive particles and material to streak across the entire surface.

Typical conditions for lapping glass, is to use terpineol vehicle with 25% (by weight) suspension of 2-12 micron alumina abrasive delivered at a minimum rate of 1 cc/sec on a 24'' lapping wheel rotating at 1 rps, and applying a maximum of 2 psi lapping pressure.

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