The selection of tool clearance angle can follow the following principles
15 7月 2022 | 没有评论 | posted by admin | in Article
(1) When processing materials with high plasticity or elasticity, in order to reduce the friction between the flank surfaces, take a large relief angle; when machining high-strength and high-hardness workpieces, in order to ensure the strength of the cutting edge, a small relief angle should be taken; The machining cutting force is small, in order to reduce friction and improve the quality of the machined surface, a larger clearance angle is preferable;
(2) When rough machining, the cutting force is large, in order to ensure the strength of the cutting edge, a smaller relief angle can be selected; the finishing cutting force is small, in order to reduce friction and improve the quality of the machined surface, a smaller relief angle can be selected;
(3) The relief angle of the high-speed steel tool can be 2~3 degrees larger than that of the tungsten steel tool;
(4) When the radial wear of the milling cutter will affect the machining accuracy, for example, after the circumferential teeth of the keyway milling cutter are worn, the diameter decreases, which directly affects the width of the keyway, and the clearance angle should be appropriately reduced (usually 8 degrees).
(5) The friction between the back of the cutter teeth of the milling cutter and the workpiece is in the direction of the re-cutting speed, and the cutting thickness is smaller than that of general turning, so the wear mainly occurs on the flank face, so appropriately increasing the clearance angle of the milling cutter can reduce the wear.
The selection of the rake angle of the tool can roughly follow the following principles
14 7月 2022 | 没有评论 | posted by admin | in Article
(1) The strength and hardness of the workpiece material are high, and the rake angle should be selected smaller; otherwise, a larger rake angle can be selected;
(2) When processing plastic materials, a larger rake angle should be selected; when processing brittle materials, a smaller rake angle can be selected;
(3) During rough machining, in order to ensure that the blade has better strength and heat dissipation conditions, the rake angle should be selected to a small point; during finishing, in order to improve the quality of the machined surface and make the blade sharp, a larger rake angle should be selected;
(4) High-speed steel tools have good bending strength and impact toughness, and a larger rake angle can be selected; carbide tools are poor in these two aspects, and a smaller rake angle should be selected;
(5) When the rigidity and power of the machine tool are insufficient, a larger rake angle should be selected to reduce the cutting force and cutting power and reduce vibration;
Sharp tooth milling cutter
13 7月 2022 | 没有评论 | posted by admin | in Article
A narrow land is ground on the flank to form the relief angle, which has a high life due to the reasonable cutting angle. The tooth back of the sharp tooth milling cutter has three forms: straight line, curved line and broken line. Linear tooth backs are often used for fine-tooth finishing milling cutters. Curved and broken line tooth backs have better tooth strength and can withstand heavier cutting loads, and are often used in coarse-tooth milling cutters.
