Общий каталог Tungaloy 2020 - 2021 - страница 1628

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Parts for ToolsTechnicalReference Depth of cut: ap (mm)Depth of cut: ap (mm)Depth of cut: ap (mm)Depth of cut: ap (mm)Depth of cut: ap (mm) User’s Guide - Technical Reference Chipbreakers Factors affecting chip control • Of these, feed has the greatest effectfollowed by depth of cut and cutting speed Vc = 100 m/min Vc = 200 m/min (1) Cutting conditions in order listed.• Feed is proportionate to the thickness of 1 Feed chips. 2 Depth of cut • Depth of cut is proportionate to the width ofchips. Effective 3 Cutting speed • There are optimum values (effective range) in range feed and depth of cut. • Cutting speed is in inverse proportion to chip thickness. Effective range becomes narrow at high speed. Feed: f (mm/rev) • These are related to thickness of chips and ease of curling. Mild steel Hard steel (2) Workpiece material • Mild steel chips are thicker than those of 1 Alloy element hard steel. 2 Hardness • Hard steel chips are liable to curl more 3 Heat treatmentcondition than those of mild steel.• Chips that do not curl are thin. As anexception, in case of mild steel even if thick, may not curl. Feed: f (mm/rev) • Side cutting edge angle is relative to chip S.C.E.A: small S.C.E.A: large thickness and width Nose radius: small Nose radius: large (3) Tool geometry • Side cutting edge angle is preferably 1 Side cutting small. edge angle • Nose radius is relative to thickness and 2 Nose radius width and the direction of flowing out. • In finishing, small nose radius, whilst for rough cutting, large nose radius is better. Feed: f (mm/rev) • Rake angle is in inverse proportion to chip Rake angle: small Rake angle: large thickness. Breaker width: small Breaker width: large (4) Shape of chipbreaker • Depending on the Workpiece material, Breaker depth: large Breaker depth: small 1 Rake angle there is an optimum value.• Chipbreaker width is selected 2 Chipbreaker width proportionately to feed. 3 Chipbreaker depth • Narrow at low feed and wide at high feed. • Chipbreaker depth is to be selected so as to be inversely proportionate to feed. • Deep at low feed and shallow at high feed. Feed: f (mm/rev) • Effective range is wider with wet cutting. • Especially at low feed range is liable to Wet cutting Dry cutting curl. (5) Coolant Feed: f (mm/rev) • The machine has enough power and (6) Machine mechanical strength. 1 Rigidity • Select the machine consistent with the 2 Power limit size of Workpiece material to be used. L040 www.tungaloy.com