Burnishing « Cogsdill Tool Products Cogsdill Tool Products

Burnishing
Tools and
Machines

Size
Finish
Work-Harden
in seconds

Roll-A-Finish Tools
External Roller Burnishing Machines
Diamond Burnishing Tools
Universal Roller Burnishing Tools

Roller burnishing is a surface finishing technique in which hardened, highly polished steel rollers are brought into pressure contact with a softer piece part.

As the pressure generated through the rollers exceeds the yield point of the piece-part material, the surface is plastically deformed by cold flowing of subsurface material.

The result is a mirror-like finish and a tough,work-hardened surface with load-carrying characteristics which make the burnished surface superior to finishes obtained by abrasive metal-removal methods.

Roll-a-Finish® tools for all types of part configurations

Cogsdill Roll-a-Finish tools are applied to a wide variety of part configurations, including:

Inside diameters (holes)
Outside diameters (shafts)
Flat surfaces
Tapers
Spherical surfaces and contours
Fillets (radii at shoulders)

Standard Roll-a-Finish tools are available from stock for inside diameters from .187 to 4.000 inches (4.75 to 101.6mm), and for outside diameters from .062 to 2.000 inches (1.57 to 50.8mm). The tools are easily adjustable over a typical range of .040 inch (1.02mm). Special designs are available for larger and smaller diameters, and for tapers, faces, contours, and virtually any part configuration.

Bearingizing Tools

The Bearingizing Tool combines roller burnishing with peening action. As the tool is rotated at a high speed the rolls spin, rise, and fall over a cammed arbor, delivering up to 200,000 rapid fire blows per minute to the work surface. The peaks and valleys of the machined surface are compacted into a smooth, hardened, and ultra fine surface finish.

The Bearingizer may be the tool of choice where the following conditions exist:

Parts with thin walls
Parts with irregular wall thicknesses
Applications where porosity is an issue
Applications where very tight tolerances must be held

Cogsdill CX External roller burnishing machine

External Roller Burnishing Machines

Cogsdill’s CX machines roller burnish cylindrical diameters of any length in seconds.

Parts are sized, finished and work hardened by highly polished, precision rollers in one quick pass.

Fatigue life, corrosion resistance and appearance are enhanced as your parts are accurately sized and finished. Various model options are designed to meet your manufacturing requirements. Equipment options are available to accommodate through-feed applications, parts with obstructions, and part-to-part size variations.

Diamond Burnishing Tools

Precision tool for producing low microinch finishes on shafts or faces of any diameter, or on large bores.

Four designs allow use on most turning machines, manual or CNC
Replaceable, polished diamond insert
Adjustable for optimum burnishing pressure

Cogsdill Diamond Burnishing Tools are simple, efficient tools designed to produce mirror-like finishes on a wide range of ferrous and nonferrous part surfaces on most turning machines.

Set up and cycle times are short, even for unskilled operators. In all cases, the replaceable diamond insert can be changed quickly; on some models without removing the tool holder from the machine.

UBT-T1 indexable turning-holder style burnishing tool and UBT-B1 boring-bar style burnishing tool

Universal™ Burnishing Tools

Cogsdill Universal™ Burnishing Tools are designed for burnishing shafts, faces, tapers, contours, and relatively large IDs (greater than 2.750 inches/69.85mm).

Boring-bar style and Indexable turning-holder style designs
Turning-Holder styles available with force gauges.
Tool designs to suit any part size or configuration, or any turning machine
Low surface finishes
Standard, available off-the-shelf
Adjustable for optimum burnishing pressure
Hardened steel or carbide rollers