Abstract
This paper focuses on an analysis of the surface texture formed during precision machining of tungsten carbide. The work material was fabricated using direct laser deposition (DLD) technology. The experiment included precision milling of tungsten carbide samples with a monolithic torus cubic boron nitride tool and grinding with diamond and alumina cup wheels. An optical surface profiler was applied to the measurements of surface textures and roughness profiles. In addition, the micro-geometry of the milling cutter was measured with the application of an optical device. The surface roughness height was also estimated with the application of a model, which included kinematic-geometric parameters and minimum uncut chip thickness. The research revealed the occurrence of micro-grooves on the machined surface. The surface roughness height calculated on the basis of the traditional kinematic-geometric model was incompatible with the measurements. However, better agreement between the theoretical and experimental values was observed for the minimum uncut chip thickness model.
Highlights
The excellent properties of tungsten carbides, such as high hardness, high wear resistance, and good toughness enable its wide application in many industries
This paper focuses on an analysis of the surface texture formed during precision machining of tungsten carbide
Tungsten carbides have been widely used in the production of cutting tools, molds, dies, as well as wear resistant parts, for example, dental burs applied in dental restorations, tool bits intended for cutting and rock drilling, and ore crushing equipment [1]
Summary
The excellent properties of tungsten carbides, such as high hardness, high wear resistance, and good toughness enable its wide application in many industries. The wide application of cemented carbides in the production of precision parts imposes restrictive requirements related to low surface roughness and high dimensional accuracy [3] These materials are usually manufactured with the application of powder metallurgy technology, and subjected to grinding with diamond wheels. The research conducted by Liu et al [13] included milling tests of tungsten carbide P30 with the application of an ultraprecision machine tool, CBN cutter with cutting edge radius rn = 3.4 lm and uncut chip thickness equal to 0.8 lm. The obtained surface roughness was independent of the feed per tooth value and characterized by the appearance of micro-grooves, which substantially affected the growth of the surface roughness Another significant problem occurring during machining of the hard-to-cut materials with the selection of low feed per tooth values (e.g., precision and ultraprecision machining) is the growth of surface roughness height. The Rpk and Rk parameters were selected in order to evaluate the machined surface’s adherence and abrasion resistance
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