Rollerbrunishing Tools

Burnishing is a method employed in the microfinishing of surfaces to obtain smooth and hardened surfaces offering high load-bearing capacity and good running properties with metallic workpieces without the necessity of cutting or machining.

All machinable metals up to a hardness of about 45 HRc are suitable for burnishing.

The finishing stage begins on a rough-machined workpiece. The required degree of rough-machining depends on material, geometry and surface finish.

Standard design burnishing tools for the internal and external finishing of workpieces operate by the positive locking process, i. e. three or more tapered rollers are retained in a cage (similar to an antifriction bearing). On the tool side these rollers are supported by an adjusting taper.

Tools for the finishing of bores are provided with an adjustable outside taper and those for the finishing of shafts with an adjustable inside taper cylinder.

The cage with the rollers is arranged for axial adjustment on the adjusting taper to permit changing of the working diameter on the tool. The tool adjustment ranges are shown in the tables on the following pages. Whenever the tool and hence the adjusting taper is retracted against the spring resistance, the tool can be released from the positive locking state without any difficulty so that it will not contact the burnishing surface.

The tool will unclamp automatically when being retracted. Due to the staggered arrangement of the rollers inside the cage in relation to the tool axis, the tools have an inherent feed so that burnishing will be possible without power feed.

Burnishing tools may he used on all machine tools with rotating drives such as drill presses, lathes, milling machines, machining centers, boring mills, etc. both as resolving and fixed tools.

Burnishing speeds are in the range from 60 to 150 meters per minute, but these speeds may be exceeded or fallen below of without any adverse influence an the finishing result. It is merely the finishing times that will change. The feeds are calculated according to the formula S = 0.025 * D for inherent feed on the tools.

When through tools with inherent Feed are used on machine tools with power feed, the forced should be selected at least 10% higher that the value calculated according to the formula S = 0.025 * D for the inherent feed on the tools.

All tools may be supplied with or without inherent feed characteristics.

Low viscosity oils or fatty emulsion should be used for Lubrications. The surfaces to be burnished should be kept free from chips or impurities and Contaminations.

The burnishing allowance should always be determined by the depth of roughness obtained during rough-machining and cannot exceed  the depth of roughness obtained rough-machining.

A complete burnishing tool consists of the basic tool and the burnishing head. The basic tool is designed for a wider range of application within which the burnishing heads of different design may be exchanged (please refer to the tables on the following pages).

Each burnishing head consists of a cage, taper and rollers. These parts may also be replaced in case of wear.

burnishing tools for bores of 5 to 500 mm diameter
burnishing tools for shafts of 1 to 200 mm diameter
burnishing tools for inside and outside tapers
burnishing tools for end faces and ring surfaces
burnishing tools for spherical surfaces
burnishing tools for stepped bores
burnishing tools for radii

We also make special tools to your requirements.