tailieunhanh - Metal Machining - Theory and Applications P2

Typical purchase price, consumable cost and change time for a range of cutting tools (prices from UK catalogues, circa 1990, excluding discounts and taxes) Tool type and size, dimensions in mm. Turning solid HSS, 6 x 8 x 100 Brazed carbide carbide insert, plain 12 x 12 x 4 25 x 25 x 7 carbide insert, coated 12 x 12 x 4 25 x 25 x 7 ceramic insert, plain 12 x 12 x 4 25 x 25 x 7 cubic boron nitride polycrystalline diamond ∅6 ∅25 ∅100 solid carbide ∅6 ∅12 ∅25 brazed carbide ∅12 ∅25 ∅50 carbide. | Materials technology 23 Table Typical purchase price consumable cost and change time for a range of cutting tools prices from UK catalogues circa 1990 excluding discounts and taxes Tool type and size dimensions in mm. Typical purchase price . Tool consumable cost Cv . Tool change time i min. Turning solid HSS 6 x 8 x 100 6 Time depends on machine Brazed carbide tool for example 5 min. carbide insert plain for solid tooling on 12 x 12 x 4 mechanical or simple CNC 25 x 25 x 7 lathe 2 min for insert tooling carbide insert coated on simple CNC lathe 1 min 12 x 12 x 4 for insert tooling on turning 25 x 25 x 7 ceramic insert plain centre 12 x 12 x 4 25 x 25 x 7 cubic boron nitride 50-60 - polycrystalline diamond 60-70 - Milling solid HSS 06 9-14 7-8 Machine dependent for 025 30-60 13-20 example 10 min for 0100 100-250 30-60 mechanical machine 5 min solid carbide 06 18-33 14-17 for simple CNC mill 2 min 012 40-80 23-31 for machining centre 025 200-400 60-100 brazed carbide 012 50 27 025 75 40 050 150 70 carbide inserts 0 50 plain per insert as turning price as turning per insert Drilling solid HSS 03 1 - 3 06 - 5 012 3 - 8 solid carbide 03 7 06 15 012 60 cutter diameter and that drilling is similar to milling with respect to regrind conditions. There is clearly great scope for these costs to vary. The interested reader could by the methods of Section test how strongly these assumptions influence the costs of machining. To extend the range of Table some data are also given for the price and consumable costs of coated carbide cubic boron nitride CBN and polycrystalline diamond PCD inserts. Coated carbides carbides with thin coatings usually of titanium nitride titanium carbide or alumina are widely used to increase tool wear resistance particularly in finishing operations CBN and PCD tools have .