563 Каталог SUMITOMO 2018 Инструмент металлорежущий Пластины Резцы Фрезы Сверла Стр.N7

Каталог SUMITOMO 2018 Инструмент металлорежущий Стр. N7 0563 Lab2u

Technical Guidance Basics of Milling Functions of the Various Cutting Angles Description Code Functions Influences j Axial rake angle Radial rake angle yX YY Controls chip removal direction, effects adhesion of the chips and thrust force etc. Rake angles can vary from positive to negative (large to small) with typical combinations of positive and negative, positive and positive or negative and negative configurations. Approach angle K Controls chip thickness and chip removal direction The effect of the small approach angle is to reduce the chip thickness and cutting force. True rake angle (Effective rake angle) Y Controls cutting performance and ability to retain a cutting edge - With a positive (large) angle, cutting ability and adhesion resistance are improved but the strength of the cutting edge is weakened. - With negative (small) angle, the strength of the cutting edge is improved but chips will tend to adhere more easily. Inclination angle X Controls chip removal direction - With a positive (large) angle, the chip removal is satisfactory with less cutting resistance but the strengh of the corner is weaker. Wiper flat clearance angle a f Controls surface finish A smaller clearance angle will produce a better surface finish. Clearance angle a Controls edge strength, tool life and chattering, etc True Rake Angle Chart K Approach angle Inclination Angle Chart -25° -20° ; -15‘ g j-10 ; - 5- k O’ r + 5" i +io' A +15" +20“ +25° +30' 80' 75° 70' 65° r55°50’45'40'35°30° 25' 20° 15 10’ K Approach angle +30° +25° +20° +15" +10° + 5° 0" £ - 5° -10° -15° -20° -25° ,-30° Exampl j Yy Yx K = in using the above chart: Axial rake angle = +10° Radial rake angle = -30° : Approach angle = 30° Solution: True rake angle Y = - 8o Exampl j Yy Yx K = in using the above chart : : Axial rake angle = -10° Radial rake angle = +10° Approach angle = 65° Solution: Inclination angle X = - 15° Formula : tan Y = tan Yx . sin k + tan Yy . cos k Formula : tan X = tan Yy . sin k - tan Yx . cos k Rake Angle Combination Negative - Positive Type Double Positive Type Double Negative Type The effects of the various angle configurations with relation to chip formation and chip removal. Chip removal direction & Rotation Radial rake angle (Positive) Axial rake angle (Positive) Approach angle (60° 75°) Advantage Disadvantage Application Typical cutter Excellent chip removal and good cutting action Only single-sided inserts can be use For Steel, Cast iron, Stainless steel, Alloy steel WGX, WGC, UFO Good cutting action Lower cutting edge strength and only single-sided inserts can be use For general milling of steel For low rigidly work piece DPG Double-sided inserts can be use and higher cutting edge strength Dull cutting action For light milling of cast iron and steel DNX, DGC, DNF Chips (Eg.) Workpiece: 37Cr4 vc = 130 m/min ft = 0.23 mm/tooth doc = 3 mm & & & & f 9 9 S) C) t t j t N7 Technical Guidance