News
Add: L4-19370 West Grand Gate, No.33, Two Period, International Trade City, YiWu City
Tel：0579-85191701
Fax：0579-85191702
Mob：13757916187
Web：www.shilitools.com
E_mail：shilitools@163.com
Location : Home > News
Twist drill structural features and cutting
Author： Views：2994 Time：2013-03-14(1) the diameter of the twist drills by the aperture limitation, the helical groove so that the finer core drilling, drill low stiffness; only two rib belt guide, the axis of the hole is easily deflected; chisel the centering difficulties axial resistance increaselarge, easy to drill swing. Therefore, the shape and position of the drilled hole error.
(2) the rake face and the flank of the twist drill is curved along various points of the main cutting edge the rake angle, rear corner of the same transverse edge of the front angle of -55 °. Cutting conditions are very poor; unreasonable distribution of the cutting speed along the cutting edge the weakest nose cutting speed so badly worn. Therefore, the hole machining accuracy is low.
(3) of the drill main cutting edge wholly edge cutting blade at each point on the cutting speed is not equal, and is easy to form a spiral-shaped chip, chip removal difficult. Extrusion friction so the chips and the hole wall, often scratching the hole wall, the surface roughness after machining low
(2) the rake face and the flank of the twist drill is curved along various points of the main cutting edge the rake angle, rear corner of the same transverse edge of the front angle of -55 °. Cutting conditions are very poor; unreasonable distribution of the cutting speed along the cutting edge the weakest nose cutting speed so badly worn. Therefore, the hole machining accuracy is low.
(3) of the drill main cutting edge wholly edge cutting blade at each point on the cutting speed is not equal, and is easy to form a spiral-shaped chip, chip removal difficult. Extrusion friction so the chips and the hole wall, often scratching the hole wall, the surface roughness after machining low
Copyright: China World Hardware Co., Ltd. （JINHUA JIUHENG INDUSTRY AND TRADE CO.LTD） Throughout the planning:www.zhongqi.cn