Engineering: high friction surfaces improve: shrink and press fits - swage fits - clamps

The green trace in the graph below is typical of dry metal to metal friction grip experienced between a tool like a drill or router gripped with a collet chuck. Trib treatment boosts frictional coupling between most static metal interfaces and uniquely changes stick/slip behaviour once slip starts as shown below.

Trib is a highly stable metallurgical process that uses a chemical to instantly enhance asperity cold pressure welds, which is classic friction; it does not employ interlocking abrasives or curing adhesives, both of which can degrade over life if subjected to cyclical loading or temperatures.

Given a steady contact pressure between smooth metal pairs, dry friction between faces follows the green curve below where static friction is greater than dynamic friction. Significantly after Trib treatment, dynamic friction (grey curve) rises above the static level and arrests slip and prevents fretting, thus for example when used on a tool shank clasped by a chuck Trib causes an extra grasping action as friction grip automatically rises to eliminate slip!

HIGH-GRIP permanent swaged, press-fit and shrink-fit torque joins

The graph below shows how the torque strength of friction joins made with H7/p6 mid range pre-fit is boosted by treating their surfaces with TRIB treatments. The green line shows a join of similar interference made with untreated surfaces. The blue line is a join treated with a moderate Trib-Gel, providing a join that will yield and absorb energy before shearing the shaft. The red line shows a very sensitive Trib-Gel that creates a join that matches parent metal strength and the shaft fails in shear with no detectable slip only elastic wind up.

	Strength of press-fit joins raised between 200% and 400%
	An alternative to spline couplings
	Shrink fit torque strength improved 100%
	Pull-out strength of swaged rigging joins strength improved 50%
	Strength of magnetic swaged joins typically doubled
	Drive shaft coupling strength improved torque strength increased typically by 25%
	Improved self locking joins angle-poise joins strength improved 100%
	Collet grip improved grip strength improved  40%
	Rotary saw blade grip more than doubled thus slip almost eliminated
	Router chuck (wood working) - grip strength improved 35%
	3-jaw chuck grip - strength improved 70% and tightening made less critical
	Improved quick-change shaft couplings and chucks - chuck grip raised typically 25%

for more information email: info8@tribtech.com

The TribTech name derives from  "tribos" - Greek for 'rubbing'. 'TribTech' is a trade name used by Ball Burnishing Machine Tools Ltd. Registered Office 12 Brookmans Av. Hatfield, Herts. AL9 7QJ. United Kingdom;  Company Reg. No. 1408807, VAT Reg. No. 421 6210 04; a knowledge based company that develops, patents and licenses technology based on aspects of  tribology, the science of surfaces. All rights reserved by Ball Burnishing Machine Tools Ltd. Last modified:  01-Oct-2009 copyright © 1999/2009. The information and data provided herein should be considered generally representative for the tools and technologies described. In all cases users should carefully evaluate the tools and technologies to determine their suitability for a particular purpose.