Ceramic Cutting Tools. Materials, Development and by E. Dow Whitney

By E. Dow Whitney

Curiosity in ceramics as a excessive pace slicing instrument fabric relies totally on favorable fabric houses. As a category of fabrics, ceramics own excessive melting issues, first-class hardness and sturdy put on resistance. not like such a lot metals, hardness degrees in ceramics regularly stay excessive at increased temperatures this means that slicing tip integrity is comparatively unaffected at excessive slicing speeds. Ceramics are Read more...

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S that are usually beyond the practical region. It is thus evident that Opitz's empirical correlation between dominant wear mode and the product (Vt06 ) is associated with tool tip temperature. tl/ V Figure 2-2. 5 Types of predominant tool wear depending on [VtO. s where V = fpm and t = ipr (after [3,4]). 6 Tool Life 17 A type of tool wear not included in Figures 2-1 and 2-2 is groove formation at the chip edge. Feed Tool Figure 2-3. Turning operation showing wear grooves formed at free edges of chips A and B (after [5]).

T ~ e5 Thus, tool life varies with tool tip temperature to a high power even for a ceramic tool, but the tool temperature exponent decreases as the tool material becomes more refractory. The dominant wear mode is also found to shift with tool tip temperature. Opitz [3] showed empirically that the dominant wear mode for a given grade of tungsten carbide shifted as the quantity Vto. 6 increased as shown in Figure 2-1. For low values of Vto. 6 , the dominant wear mode corresponds to blunting or rounding of the cutting edge.

Mo: C: Cr: V: Co: Acts as a substitute for W Provides high hardness Increases hardenability Increases wear resistance Increases hot hardness the microstructure of steels, are a major contributor to the wear resistance of the grade. Grade M4 (4% vanadium) is very wear resistant, compared to the previous four grades. The addition of cobalt (Co) to the chemical composition increases the hot hardness of the steel and elevates it to a "premium" category of higher performance and price. 5% carbon, 5% vanadium, and 5% cobalt.

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