Applied Machining Technology by Heinz Tschätsch

By Heinz Tschätsch

Machining and slicing applied sciences are nonetheless the most important for lots of production procedures. This reference provides all very important machining methods in a finished and coherent means. It offers the working towards engineer with many technical info of the producing methods and collects crucial facets reminiscent of greatest accessible precision, mistakes or reference values.

Many examples of concrete calculations, difficulties and their recommendations illustrate the fabric and aid the training reader. the net addresses given within the appendix supply with a quick hyperlink to additional information sources.

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1 Metal removal rate With regard to the metal removal rate, we have to distinguish between the volume of the removed material Qw and the space needed for the randomly arranged metal chips Qsp. The volume of the removed material identifies the volume occupied by a chip with cross section ap· f (depth of cut multiplied with feed) and a defined length per minute. Qw = ap · f · vc · 103 Qw ap f vc 103 in mm3/min in mm in mm in m/min mm/m volume of removed material depth of cut feed cutting speed conversion factor for vc, from m/min to mm/min The volume of the randomly arranged metal chips removed Qsp is greater than the real volume of the same amount of removed material Qw, since, in a reservoir, the chips are not located one next to one another without gaps.

In the case of steel, kc1,1 increases as a function of C content and alloying components. The coefficients kc1,1 and z are regarded as material constants. 2 Thickness of cut h Thickness of cut is the variable that has the most effect on ks. The greater h, the less ks. 19). kch  z kch kc1,1 (1 mm) z s kc1,1 hz chip thickness exponent (material constant) in N/mm2 spec. cutting force (influence of h taken into account) in N/mm2 spec. 4 Rake angle γ Rake angle γ is taken into account when calculating the correction coefficient Kγ.

For this reason, ball grains are used instead of centre points in the case of larger workpieces. 9 Taper turning by sidewise shifting of the tailstock a sliding movement of the tailstock sR, b inadequate position of the tail centre Tapers that are produced by swivelling out of the tailstock, can also be generated with automatic lengthwise feeding movement of the lathe. 6 Copy turning The shape of the workpiece is taken from geometry storage (taper guide bar, template, and replica) and transmitted to the longitudinal- and cross slides.

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