Product category:
Turning tools
News Release from: Engis (UK) | Subject: Single-pass bore finishing - different materials
Edited by the Manufacturingtalk Editorial
Team on 13 May 2004
Single-pass bore finishing applications
broaden
From being a process only applicable in finishing of CI through bores, single-pass bore finishing can now be applied on blind bores, through bores, stepped bores and in many different materials.
From being a process that was only applicable in the finishing of cast iron through bores, single-pass Bore Finishing can now be successfully applied on blind bores, through bores, stepped bores and in almost every type of material John Welling, MD, Engis (UK), looks at developments in single-pass bore finishing, as outlined in a recent paper by Robert Marvin, Product Manager, Bore Finishing Systems, Engis Corporation
This article was originally published on Manufacturingtalk on 8 Jan 2001 at 8.00am (UK)
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"During the last few years single-pass bore finishing has gained significant popularity due to its ability to both improve bore geometry - achieving 0.0005mm in production, and improve surface finish - to better than 0.1 micron Ra in most materials.
From being a process that was only applicable in the finishing of cast iron through bores, single-pass Bore Finishing can now be successfully applied on blind bores, through bores, stepped bores and in almost every type of material.
Mechanics of the process - single-pass bore finishing is performed with barrel shaped tools coated with either diamond or cubic-boron-nitride (CBN) particles.
Further reading
Cooling nozzles boost grinding performance
Cooling system reduces coolant consumption, increases stock removal efficiency, extends grinding wheel life and provides enhanced surface finish characteristics.
Diamond compounds provide more surface coverage
Diamond compounds, specifically designed for mould polishing, provide more surface coverage and improved impregnation of lapping tools. The products are also oil soluble.
The tool is passed once through a bore while the tool, the part, or both, rotate.
Single-pass tools therefore wear more slowly than conventional hones, and can maintain tighter control of bore size.
Stock removal and surface finish capabilities are directly related to the size of the superabrasive particles used.
Many applications, therefore, require the use of a series of pre-set, single-pass tools in a multi-tool operation.
With this arrangement, coarse grit tools are used for the initial material removal stages, while fine grit tools achieve the desired surface finish, for maximum efficiency.
The single pass process has traditionally been applied to high volume production runs.
However, with recent developments in quick-change tooling and fixtures, short runs have also become practical.
Conclusion - the single-pass superabrasive process has come a long way since its introduction and a growing number of companies are now manufacturing components to a higher quality and at substantially reduced overall costs by using it.
Engis single-pass, superabrasive bore finishing systems provide a very cost-effective choice over conventional honing for virtually any bore finishing application and work-piece material, as extremely tight tolerances can be held reliably and consistently in a production environment at a lower overall cost per finished piece.
As more advances are made in this field it is possible that traditional finishing operations may even, one day, become obsolete.".
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