Twist drill hole accuracy is low? It turned out that these four points caused
16 4月 2018 | 没有评论 | posted by admin | in Article
1, correct sharpening cutting angle and improve surface roughness:
The bit is similar to the reamer. If there are two main cutting edges and secondary cutting edges, the secondary cutting edge is spiral, with lands and chamfers, which can increase the smoothness of cutting. As long as the cutting angle and surface roughness of the drill are improved and improved with reference to the requirements of the cutting edge. Basically there is a condition similar to a hinged blade.
2, determine the reasonable amount of cutting In the amount of cutting, the impact on the hole accuracy is the depth of cut and the amount of feed, the greater impact on the service life of the bit is the cutting depth and cutting speed. For this purpose, the depth of cut, cutting speed, and feed amount should be controlled separately. Avoid large cuts, reduce heat, avoid shocks and vibrations, eliminate cold work hardening, improve processing quality, and extend bit life. Pre-drilling should prevent the production of more chilled layers, which can increase the drilling load and wear out the fine hole drill.
3. Due to the precision machining of the drilling hole, its accuracy and surface roughness are high, and the cutting load is small. Therefore, the lubrication-based cooling lubricant should be selected.
4, because the drill will wear after multiple uses, and affect the aperture accuracy. The two cutting edges of the drill should be as symmetrical as possible. As a complex tool, the drill bit requires a large degree of durability, and imposes a certain limit on the wear amount of the corner as a blunt standard.
The formation of surface cracks at the bottom of the sipe
13 4月 2018 | 没有评论 | posted by admin | in Article
The contact surface formed by the blade and the sipe causes the uneven distribution of the black holes so that the welding cannot form a flat bond. The uneven distribution occurs so that the solder not only affects the strength of the weld and causes stress concentration, causing the blade to break. Therefore, the grinding contact surface of the boring blade should be clean and the appearance of the welding blade sipe.
The blade holder of the blade that needs to protrude is not more than 0.5mm to receive tensile force and breakage.
Three-edge cutter use
12 4月 2018 | 没有评论 | posted by admin | in Article
In addition to the main cutting edge on the circumferential surface, the three-edge milling cutter also has secondary cutting edges on both sides, thereby improving the cutting conditions, improving the cutting efficiency and reducing the surface roughness. It is mainly used for milling of stepped and grooved surfaces of medium hardness and strength metal materials. It can also be used for processing of non-metal materials. The ultra-hard material three-blade cutter is used for the milling of stepped and grooved surfaces of difficult-to-cut materials. Processing. It is mainly used to mill the groove of fixed value size, and can also mill general groove, step surface and side surface.
