Precision Engineering by VENKATESH

By VENKATESH

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C) Free abrasive (erosion) processes such as lapping, polishing, elastic-emission machining and selective chemico-mechanical polishing (d) Chemical (corrosion) processes such as controlled etch machining (e) Energy beam processes (removal, deformation and accretion) including those given below: (i) Photon (laser) beam for cutting, drilling transformation hardening and hard coating (ii) Electron beam for lithography, welding (iii) Electrolytic jet machining for smoothing and profiling (iv) Electro-discharge (current) beam (EDM) for profiling (v) Electrochemical (current) (ECM) for profiling (vi) Inert ion beam for milling (erosion) microprofiling (vii) Reactive ion beam (etching) (viii) Epitaxial crystal growth by molecular-bit accretion for manufacturing new super-lattice crystals, etc.

The special performance of the coatings and the substrate can be summarized as follows: Tool Materials for Precision Machining 39 TiCN/TiN Alpha Al2O3 HTCVD TiCN 5 μm (a) (b) Fig. 6: (a) A TiC coated carbide insert without any eta phase carbides (W3Co3C) and free tungsten (Widia) and (b) a newly developed Kennametal grade KC9010 showing coated layers [9]. 18 μm TiCN/TiN ⎫ ⎪ Alpha Al2O3 ⎬ 18 μm total ⎪ HTCVD TiCN ⎭ Fig. 7: Microstructure of the Kennametal grade KC9110 showing the cross section of the tool nose [10].

Further modifications are necessary, such as a variable speed for the gradual increase in speed, and a variable feed to minimize the shock while the tool enters and leaves the work piece. F. V. drive. This lathe has been installed in the Machine Tool Laboratory of the Indian Institute of Technology, Madras. 1 Hot-pressed Ceramics Hot-pressed ceramics or black ceramics, which were introduced in the 1960s typically, contain a mixture of aluminium oxide and titanium carbide. Black ceramics are usually employed in the machining of cast iron with hardness above 235 HB and steel with a hardness of between HRC 34 and HRC 66.

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