Tungsten Carbide Rotary Burrs Description (2/2)

Compared with developed country, there are several problems in tungsten carbide rotary burrs of our country: 1. The defect of materials (includes the purity of raw material, the machining parameters control, etc.,); 2. The most used tungsten carbide rotary burr is not integral, which uses tungsten carbide as head, bearing steel as shank and fabricated rotary burr by welding. So it will have problems in welding firmness; 3. The precision and operability of CNC machining equipment; 4. The angle, shape and tolerances of the edge and insufficient concentricity.

In order to further improve the cutting properties and extend the service life of tungsten carbide rotary burr, we analyze it from the mechanism of cutting and forming. Generally, Carbide rotary burrs edge back is composed of straight or curved: the straight edge is easy to be processing, but the strength of the edge is lower; the intensity and difficulty of processing polyline edge back has a certain increase; although curve edge has a difficulty in processing, it can ensure that the strength at any point of the cross-section is substantially equal. Therefore, we need to find out a kind of edge that based on the strength and also easy to be fabricated.

Besides, the spacing between two edges also plays a important role in the process. If the spacing is too large, the corresponding cutting and machining efficiency decreases; if the spacing is too small, it can not ensure the scrap removing, which will have an effect on edge blocking and the efficiency of tungsten carbide rotary burr. The overall milling process can be divided into three steps: the initial wear stage, normal wear stage and rapid wear stage. On each of the different stages through reasonable cutter angle (rake angle, relief angle, the main angle, relief angle and blade angle) choice, you can reduce the wear of the cutting force and cutting heat brought in the same under the cutting conditions, cutting into full play, enhance overall efficiency and precision. Overall, improvements and material from the rotary file rotary file blade teeth should have high hardness, high strength, high wear resistance, good impact resistance and high temperature conditions can still ensure good cutting performance, but also to facilitate the processing of the material; The tolerances on the edge to be precise enough to meet the requirements of surface roughness.

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