Основной каталог Kyocera 2021 - 2022 - страница 1058

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Terms and angle of toolholders Turning Terms and angles of turning toolholder Side rake angle Side relief angle Overall length Minor cutting edge angle Shank width Corner radius Cutting Approach angle edge angle Edge height Inclination angle Shank height Front relief angle Function of tool angle Tool angle Name Function Effect Side rake angle · If it is positive (+) angle, sharper cutting performance is obtained. (less cutting force, less edge strength) · Affects cutting force, cutting heat, chip · Positive (+) angle is recommended for easy to machine workpieces or thin workpieces. Rake angle Inclination angle evacuation and tool life. · Smaller rake angle or negative (-) angle is recommended when a stronger edge is required like scale machining or interrupted machining. Front relief angle · Prevents the tool's contact to the workpiece Relief angle · When it is small, the cutting edge becomes strong, but the wear at relief faces may shorten the tool life. Side relief angle surface, except the cutting edge. · Affects chip control and the direction of Cutting edge angle · When it is large, chip thickness becomes thick and chip control improves. cutting force. · When it is large, chip thickness becomes thin and chip control worsens, but cutting force is dispersed and Cutting edge angle · Affects chip control and the direction ofApproach angle edge strength improves. cutting force. · When it is small, chip control ability improves. · Prevents friction between cutting edge and Minor cutting edge angle · When it is large, edge strength deteriorates. R workpiece surface. Toolholder rigidity 1. Flexure of toolholder 2. Flexure of boring bar Symbol Name Unit Symbol Name Unit δ (Delta) Deflection mm δ (Delta) Deflection mm B Shank width mm DCON Shank dia. mm H Shank height mm E Young ratio N/mm2 4 x F x (LPR)3 4 x k x ap x f x (LPR)3 E Young ratio N/mm2 ap Depth of cut mm δ= =E x B x H3E x B x H3 ap Depth of cut mm f Feed rate mm/rev f Feed rate mm/rev δ= 64 x F x (LPR)3 = 64 x k x ap x f x (LPR)3 k Specific cutting force N/mm2 Incorrect k Specific cutting force N/mm2 3 x E x π x (DCON)4 3 x E x π x (DCON)4 LPR Overhang mm LPR Overhang mm F Cutting force N H F Cutting force N Clamp screw (F = k x ap x f) (F = k x ap x f) Overhang LPR Cutting force F Load The exural strength of toolholder will decrease by increasing of shank height by third root and will decrease of reducing overhang by third root. Minimizing toolholder shank overhang as much as possible is important as well as shank's sectional square measure. Supporting point Amount ofOverhang LPRSleevedisplacement R30 Technical information DCON