Reasonable sharpening of the drill bit has a great impact on the life of the center drill. This new type of center drill has a faster wear on the front end bit than the other parts. Note when sharpening: 1 Improve the sharpening quality of the tool, and ensure that the surface of the tool has a low surface roughness value. Generally, Ra = 0. 4μm, which can reduce the friction between the chip and the rake face and between the workpiece and the tool. Effective measures for production efficiency and tool life. 2 The sharpening edge must also grind a large relief angle (8°~12°). Otherwise, the flank of the drill center will be seriously rubbed against the workpiece and the knife will be resistant to cutting. 3 The drill bit mainly sharpens the two main flank faces. In addition to ensuring the correct size of the apex angle and the back angle, it is also necessary to ensure that the two main cutting edges are symmetrical to prevent the aperture from expanding and the hole axis from being straight, which is prone to hole drilling. Partial. 4 Grinding the chisel edge is generally guaranteed to be at 0. 50 ~ 1mm, in order to reduce the axial resistance and the squeeze phenomenon, improve the centering action of the drill bit and the stability of the cutting. 5 The center drill is mainly used for chip breaking. According to the practice, the sharpening bit ensures that the transverse blade length is 0. 50 ~ 1mm, and the secondary back angle D surface of 6°~8° is ground on the flank of the drill bit (see Figure 3). When the two rear corner faces meet, an edge appears, and the chip breaking effect is very good. It is easy for the broken chips after chip breaking to be easily discharged from the spiral groove under the impact of the cutting fluid, avoiding the chaotic winding. On the tool, to prevent chip clogging and affect normal processing.
4. Conclusion
The above-mentioned high-efficiency composite center-drilling structure design and its rational use method are all combined with practice, continuous trial production, continuous exploration, and continuous accumulation of experience. Effectively ensure the accuracy of the center hole, improve the quality of the product and processing efficiency. Not only does it improve machine utilization, but it also increases tool life and reduces tool wear and tool costs.
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