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Description :

　　A drill bit is a tool used to drill through holes or blind holes in solid materials and to expand existing holes.

　　The commonly used drill bits mainly include Fried Dough Twists drill, flat drill, center drill, deep hole drill and nesting drill. Although reaming and countersunking drills cannot drill holes in solid materials, they are commonly classified as drill bits.

　　Drill bit product structure

　　The cutting action of a drill bit is its head, and its cutting edge and transverse edge act as cutting tools. In order to ensure that the conical surface of the cutting part does not touch the workpiece and has a back angle, the value of the back angle should be appropriately selected according to the material of the workpiece.

　　1. Horizontal blade

　　The sharpness of the horizontal blade is very poor. A large-diameter drill bit has a thicker core, resulting in a larger transverse edge. Additionally, the transverse edge of the drill bit will become larger during heavy grinding. To increase sharpness or restore the same sharpness as in the initial grinding stage, it is necessary to perform cross blade grinding.

　　2. Blade strap

　　Guide within the processed hole wall to ensure accurate processing. But in such situations, if there is high friction with the hole wall, the drill bit will overheat and the power consumption will also be excessive. So, usually there is a very small taper from the head of the drill bit to the handle, which is called an inverted cone, about 0 About 04-00.1 millimeters.

　　3. Spiral groove

　　It is designed to discharge chips, and its size should ensure smooth chip discharge with a spiral angle. The helix angle of its groove varies depending on the type of material used in the workpiece. For hard materials, the angle should be small, and for soft materials, the angle should be large. The ordinary drill bit used for processing steel has a helix angle of approximately 30 degrees.

　　4. Top angle of drill bit

　　When the tip angle of the drill bit is small, although it is easier to cut into the workpiece, its disadvantage is that the cutting edge becomes longer, the required power increases, and the rake angle of the cutting edge decreases, resulting in a shortened lifespan. Therefore, the top pointed drill bit is used in drilling holes in soft materials. Usually, for general steel materials, the top angle is around 120 degrees.

　　Maintenance and precautions for drill bits

　　After using the drill bit, it should be immediately checked for any damage, passivation, or other adverse conditions. If any are found, it should be ground and repaired immediately;

　　2. When storing, the drill bit should be placed in the correct position, which is convenient and time-saving for future use, saving time in searching for the drill bit again

　　When drilling through a hole, at the moment when the drill bit is about to penetrate, it is necessary to apply light pressure and slowly insert the tool to avoid the drill bit from twisting due to excessive force;

　　4. Before drilling, the center point must be drilled to accommodate stillness and prevent the drill bit from touching the bottom. This can guide the drill bit to the correct drilling position;

　　5. When drilling, full use should be made of cutting and attention should be paid to chip removal;

　　When drilling intersecting holes, large-diameter holes should be drilled first, followed by small-diameter holes;

　　7. The phenomenon of breakage or sudden stop of the drill bit during drilling may be due to too fast feed, grinding, or rapid cooling and heating during drilling;

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