1084 Каталог KORLOY 2016 Металлорежущий инструмент и станочная оснастка ENG Стр.L17

Каталог KORLOY 2016 Инструмент и оснастка Стр. L17 1084 ENG Lab2u

Cutting edge shape and the affects Turning Rake angle (a) Rake angle has big influence on cutting force, chip flow and tool life. Principai force(kg) Feed force(kg) 50 100 150 200 250 Cutting speed (m/min) 150 200 250 Cutting speed (m/min) Affects 1. High rake angle results in good suface finish. 2. As the rake angleincreases by 1° Machining power decreases by 1%. 3. High rake angle weakens cutting edge. Selection system 1. For hard workpiece / For applications that need strong cutting edge such as interrupted and machining mill scale - Low rake angle 2. For soft workpiece / Easy to cut material / When the rigidity of machine power and workpiece is low - High rake angle Rake angle and the direction of chip flow Rake angle y Side rake angle: K Y :nega(-) X :nega(-) Y :posi(+) X :nega(- Y :nega(-) X :posi(+) Y :posi(+) X :posi(+) In order to prevent machined surfacefrom damages Avoid nega, posicombination. Y ega(-) A:posi(+) Relief angle Relief angle Selecting proper tools Nowadays, It’s very difficult to select the best tools in complicating tooling system and various cutting conditions. However, It can be simplified by classifying basic factors below. Selection of inserts and tool holder Listed below is the basic factors and choose B according to A. A Basic factors Workpiece material Workpiece shape Workpiece size Hardness of workpiece Surface roughness of workpiece (before machining) Surface finish required Type of lathe machine Condition of lathe machine (rigidity, power etc) Horse power of machine Clamping method of workpiece B Selection system Select as big approach angle as possible. Select as big shank as possible. Select as strong cutting edge of insert as possible Select as big nose radius as possible In finishing, Select the insert using many corners Select as small insert as possible Cutting speed should be determined carefully according to cutting conditions Select as deep depth of cut as possible Select as fast feed as possible Cutting condition should be determined within chip breaker application ranges. Technical Information 17