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Machining nickel bass superalloys

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Ni base superalloys are machined by 1st using laser or electric discharge machining to remove material, leaving recast layer, followed by chemical milling to remove only recast layer. Etchant comprises (vol.%) NHO3 40-60, HCl 5-20, water 20.55, plus FeCl3 0.016-0.025, CuSO4 at least 0.008 moles/l. FeCl2 improves removal rate but may cause pitting and intergranular attack which are inhibited by CuSO4.

Machining non-conductive workpieces

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Electrolytic and electro-discharge machining of workpiece of non-conductive material using grinding wheel with alternate conductive and non-conductive abrasive regions on periphery. Workpiece is immersed in electrolyte and rotating wheel is 1 brought into contact with it while ac or dc voltage is applied. Workpiece may be ceramic, glass, quartz or sapphire.

Machining of Hard Materials

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Machining of materials using laser beams. Pt. 9. Surface protection

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Specific properties of laser beams are increasingly used for selective improvement of surface properties with regard to fatigue, temp. and corrosion resistance. Processes are discussed.

Machining of optical surfaces with individual diamond tools

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Machining of Polycrystalline Diamond

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Machining of stainless steels by spray-etching. Pt. 2. Reproducibility of etch removal. Effect of temperature fluctuations and changes in etchant

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Strong dependence of etch rate on temp. requires constant temp. to achieve high reproducibility, e.g., use of electronically controlled thermostats. FeCl3 etchant ages relatively rapidly losing etch rate. Treatment with Cl2 gas is possible but hazardous and impracticable in small plant. Regeneration of etchant by dosing HCl, fresh etchant and additives is not recommended for precision work due to variations in etch rate.Special automatic circuit facilitates adaptation of etch period to conditions, compensating for ageing.

Machining performance and decomposition of TiAlN/Ti nitride multilayer coated metal cutting inserts.

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Machining performance of Ti-Al-Si-N coated inserts

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Machining performance of titanium nitride coatings incorporating indium as a solid lubricant

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Machining Technique is Fast, Accurate

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Machining Thermal-Resistant High-Strength Materials

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Machining Tool.

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Machining tool consisting of a hard base material, a cermet base material or a ceramic base material and a single or multi-layer hard material coating that is applied to said base material. An additional covering is applied to the hard material coating, said covering consisting of one or more metals from the group containing aluminium, copper, zinc, titanium, nickel, tin or of base alloys of said metals.

Machining tool.

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Hard base metal, cermet or ceramic base material and single or multilayer coating. An additional covering is applied to hard metal coating consisting of 1 or more of aluminium, copper, zinc, titanium, nickel, tin or base metal alloys of these.

Machining unit for a grinding machine

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Title unit carries four spindles each with a number of grinding wheels movable in X and Z axes around workpiece.