Influence of Different Grinding Processes on Surface and Subsurface Characteristics of Carbide Tools

Abstract

The manufacturing process of coated cutting carbide tools is highly specialized and indicated by a complex grinding strategy. Different grinding operations are used with high demands towards homogenous properties of ground surfaces. Properties like roughness, surface topography, and residual stress highly influence the wear behavior of cutting tools and especially of coated cutting tools. Due to complex shaped drilling and milling tools, several grinding operations are used to manufacture the entire tool. The different grinding processes determine different residual stress states in the subsurface of the substrate due to various mechanical and thermal loads. In this contribution the three different grinding operations, cup wheel grinding, creep feed grinding, and peripheral grinding, are investigated. The experimental procedure shows, that the various grinding processes determine different properties of the ground surface like topography, roughness and residual stress. To characterize and compare the various grinding operations, a model for chip thickness in grinding is introduced. The results in experiments show a distinct correlation between the chip thickness in grinding and several properties of the ground surface. As a result of improving the residual stress state of the carbide tool, a superior wear behavior in dry machining is observed.

Influence of substrate microstructure and surface finish on cracking and delamination response of TiN-coated cemented carbides

“…A ground variant is compared to a mirror-like polished one, the latter used here as reference condition. It is well-established that thermal and mechanical loads in grinding of hardmetal tools induce surface integrity alterations [21,[28][29][30][31][32][33][34][35][36][37][38][39][40][41].…”

Contact damage resistance of TiN-coated hardmetals: Beneficial effects associated with substrate grinding

“…On the other hand, a favorable effect of substrate grinding on lifetime of coated hardmetal tools (i.e. enhanced tribomechanical performance) is well established [3,7,13,17,[19][20][21]. Therefore, knowledge and understanding of these surface finish effects become relevant for effective design of coated hardmetals in machining applications involving extreme service conditions, e.g.…”

Precision Vertical Grinding of Cemented Tungsten Carbide Using CBN Wheels

“…In recent years, because of the good wearability and high hardness, cemented tungsten carbide materials are wildly used in electronics, optics, instrumentation, aerospace, defense industry fields [1,2]. Precision grinding technology of tungsten carbide has aroused widespread concern in all countries [3,4]. Precsion grinding using cubic boron nitride (CBN) grinding wheel is recognized as the most appropriate method for efficient processing of hard and brittle materials.…”