In the model trade industry, the drill bit is one of the key tools, and its performance directly affects the quality and efficiency of model processing. However, the drill bit will gradually wear out during use, affecting the cutting effect. If it is not sharpened in time, it may lead to a decline in processing quality, an increase in cost, and even damage to the workpiece. Therefore, every machinist will have this skill--manual processing and sharpening of the drill bit.
Why does the drill bit need to be sharpened?
During the long-term use of the drill bit, the cutting edge will gradually become blunt, the drilling force will increase, and the cutting efficiency will decrease. If the blunted drill bit continues to be used, it will not only increase the processing time, but also may cause inaccurate drilling and affect the overall processing quality. Grinding the drill bit can restore its cutting performance, extend its service life, ensure processing quality, and save production costs.
How to judge whether the drill bit needs to be sharpened?
1.Cutting effect: If obvious sparks and vibrations are found during the drilling process, or the surface of the drill hole is rough and uneven, it means that the drill bit edge may have been blunted and needs to be sharpened.
2.Cutting force: When drilling, more force is required to drill through the workpiece, which is also a signal that the drill bit needs to be sharpened.
3.Processing accuracy: Inaccurate drilling size, large or small hole diameter, indicating that the cutting edge of the drill bit has been worn.
Grinding drill bits requires certain skills and tools:
1. Pay attention to the symmetry of the top angle of the drill bit. Generally, the standard drill bit is 118 degrees or 120 degrees. The 118-degree drill bit is suitable for low-carbon steel and non-ferrous metals, and the 135-degree drill bit is suitable for tool steel and high-carbon steel. The sharpening should be at a small angle, otherwise it will be difficult to cut into the material.
2. Before grinding, ensure that the length and shape of the cutting edge are as similar as possible. The inclination angle of the drill bit should be 7-10 degrees. Use diamond to evenly grind the edge to ensure that the grinding wheel cannot have radial and end vibration.
3. The auxiliary platform should be within one millimeter of the grindstone. In order to facilitate the sharpening of the drill bit, you can draw several 60-degree lines in the auxiliary area to help us maintain the correct angle during the sharpening process.
4. Keep the drill bit parallel to the platform and keep the cutting edge horizontal
5. Check the grinding effect: The drill bit should stop after it is tilted up. Grind the convex arc of the rear end face into a bow-shaped bevel, which should be symmetrical on both sides, and the back-grinding cutting groove should also be symmetrical on both sides.
6. Regular inspection: After the drill bit has been used for a period of time, the cutting edge should be checked regularly, and sharpened in time to maintain good cutting performance.
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Mastering the drill bit sharpening skills can not only improve the processing quality and efficiency, but also extend the service life of the drill bit and reduce production costs. For enterprises and individuals engaged in the trade of hand-board models, learning to sharpen drill bits is an indispensable skill. I hope this article can help everyone better understand and master the essentials of drill bit sharpening and provide strong support for production and processing.