Characterization of surface textures generated on hardened steel parts in high-precision machining operations

W Grzesik,K Żak,J Rech

doi:10.1007/s00170-015-6800-4

Abstract

This paper presents the comparison of surface textures produced by high-precision cutting and abrasive processes on hardened steel parts. Investigations include surfaces generated by hard turning, belt grinding, and superfinishing (external honing) operations. As a result, several surfaces generated with different process kinematics and the Sa roughness parameter of about 0.05 μm were compared. Apart from the standard 2D and 3D roughness parameters, the fractal, motif, and frequency parameters were considered.

Highlights

The technological shifts in surface metrology allow the surface features generated by modern manufacturing processes to be characterized with a higher accuracy using a number of the field parameters
Hardened rings made of a 41Cr4 (57±1 HRC) with initial 0.4 μm Sa obtained by Cubic boron nitride (CBN) turning were optionally turned, belt ground, and superfinished in order to generate surfaces with the Sa roughness of about 0.05 μm
The machine tools were Okuma Genos L200E-M CNC precision turning center, special belt grinding device described in [9] and superfinishing head mounted in a conventional lathe described in [10]

Summary

Introduction

The technological shifts in surface metrology allow the surface features generated by modern manufacturing processes (including hard part machining) to be characterized with a higher accuracy using a number of the field parametersW. The capability profiles of cutting and grinding operations against the functionality of the machined surfaces were discussed. This is because hard turning and grinding, as well as other abrasive finishing operations, generate different surface structures which influence distinctly their functional properties. This attempt includes only 2D height and amplitude parameters and the relevant bearing area curves (BACs) shapes [8]. The quantitative criterion was that the Sa and Sz roughness parameters are about 0.05 and 1 μm, respectively

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Results

Conclusion