581 Каталог SUMITOMO 2015 Режущий инструмент и инструментальная оснастка Стр.577

Каталог SUMITOMO 2015 Инструмент и оснастка Стр. 577 0581 ENG Lab2u

Tool Life Tool Life Wearing Process Curve Life Curve (V-T Lines) Tool Life Equation Alternative Tool Life Criteria Flank Wear Vb Vc Vn V n/t c TO C LL' <4- °> pS Sudden Wear I VB Width of Flank SS t j '"steady State Wear Mean Wear Vc Maximum Wear of Nose Radius VN Grooving Wear Cutting Time T (mm) Initial wear very fast,then evens out to a more gradual pattern, until limit is reached; wear is then increased substantially. Crater Wear Depth of Crater Wear Width of Land Distance Between The Center of Crater Wear and Cutting Edge - Cutting Time T (min.. Crater wear is more progressive; no sudden breakdown pattern. At four speeds V1, V2, V3 and V4, the relative tool lives for a given flank wear VB or crater K are indicated as Ti, T2, T3 and T4 respectively, using log-log graph paper. Flank Wear Face Wear e c o CL CD c ar e 5 Cutting Time (mm) e O e Vi V2 V3 V4 ) V1 V2 V3 V4 Y- T3 T4 1 T2 Lifetime (min. T1 T2 T 3 Li.etime (min.) T Tool Life Equation (Taylor's Equation) VTn = C V Cutting Speed T Tool Life n Constants determined C by work material, tool material, tool design, etc. When surface finish deteriorates unacceptably. When a fixed amount of tool wear is reached (see the right-hand table). (3) When work piece dimension is out of tolerance. When power consumption reaches limit. Sparking or chip discoloration and disfigurement. Cutting time or component quantity. Width of Flank Wear for General Life Determination (For Cemented Carbides) Width ofWear (in.) Applications .008 Finish cutting of non-ferrous alloys, fine & light cut, etc. .016 Cutting of special steels .028 Normal cutting of cast irons, steels, etc. .040-.050 Rough cutting of common cast irons 577 Technical Guidance