Burnishing is a versatile process that improves the finish and dimension of precision turned parts. Tools and holders can be mounted on the machine tool to eliminate secondary operations.
In today’s cost-conscious manufacturing environment, what shop owner or production manager would not be excited about achieving accurate size and fine finish on the original machine on which parts are produced? Roller burnishing can help users eliminate secondary operations for substantial time and cost savings, while at the same time improving the quality of their product.
Roller burnishing is a method of producing an accurately sized, finely finished and densely compacted surface that resists wear. Hardened and highly polished steel rollers are brought into pressure contact with a softer workpiece. As the pressure exceeds the yield point of the workpiece material, the surface is plastically deformed by cold-flowing of subsurface material.
Roller burnishing is used to reduce the peaks and valleys that occur in the microstructure of machined parts. The process uses pressure from hardened steel rollers to deform the metal surface by cold-flowing the subsurface material. Eliminating the unstable microstructure is especially critical for optimum performance of wear parts.
Generally, a small amount of standard, lightweight oil is sufficient for lubrication of the burnishing. Keeping the metalworking fluid clean to prevent metal particles or grit from being rolled into the finished workpiece is critical for the burnish operation.
A burnished surface is actually smoother than an abrasively finished surface of the same profilometer reading. Profilometers measure roughness height. Abrasive metal removal methods lower the roughness height, but they leave sharp projections in the contact plane of the machined surface. Roller burnishing is a metal displacement process. Microscopic “peaks” on the machined surface are caused to cold flow into the “valleys,” creating a plateau-like profile in which sharpness is reduced or eliminated in the contact plane.
The burnished surface will therefore resist wear better than the abraded surface in metal-to-metal contact, as when a shaft is rotating in a bushing.
If you want to buy roller burnishing tools, welcome to our product page for details. Our roller burnishing products include: ID Roller Burnishing Tools, OD Roller Burnishing Tools, Flat Surface Roller Burnishing Tools and Taper Roller Burnishing Tools etc.