How to sharpen hard high performance drill bits fast and durable

Drill bit is very common in our daily life, it is a tool with cutting ability on the rotating head, generally milled or rolling quenched with carbon steel SK, high speed steel SKH2, SKH3, etc. It is used for drilling processing of metals and other materials, and can be applied to drill press, lathe, milling machine, hand drill and other tool machines.

For those of you who are encountering drill bits for the first time, you will inevitably wonder how the drill bits are sharpened to be fast and durable. Don't worry, the following is a detailed explanation of the types of drill bits and how they are sharpened to be fast and durable. It may be helpful to you.

1. The cutting edge should be flat with the surface of the grinding wheel.

   
   

Before sharpening the drill bit, the main cutting edge of the drill bit and the grinding wheel surface must be placed on a level surface. That is, when the cutting edge touches the grinding wheel surface, the entire cutting edge must be ground. This is the first step in the relative position of the drill bit and the grinding wheel, and the position is placed and then slowly approached to the grinding wheel face.

2. The drill bit axis must be inclined at an angle of 60° to the grinding wheel face

The angle is the front angle of the drill, and the wrong angle at this point directly affects the size of the top angle of the drill and the shape of the main cutting edge and the angle of inclination of the cross edge.

3. Backward grinding from the cutting edge

After the cutting edge touches the grinding wheel, grind backward from the main cutting edge, that is, from the cutting edge of the drill first touching the grinding wheel, and then grind down slowly along the whole back of the cutting surface.

4. The drill edge should swing up and down and the end of the drill should not be warped

This is the standard drill grinding action, the main cutting edge should swing up and down on the grinding wheel, i.e. the hand holding the front of the drill should swing evenly on the the hyperbolic cosine of the drill bit should be swung up and down on the grinding wheel surface.

5. Ensure that the symmetry of the cutting edge tip to both sides of the shaft is slowly corrected

When grinding one side and the other side, you must ensure that the edge tip is in the middle of the drill shaft and the edge tip on both sides is symmetrical. Experienced masters look at the symmetry of the drill against the light and grind slowly.

6. After grinding both edges, attention should be paid to the tip of the drill with a larger diameter

There is a flat surface at the tip of the drill bit that affects the center surface of the drill bit and the center positioning of the drill bit. It is necessary to chamfer behind the cutting edge to reduce the flatness of the cutting edge tip as much as possible.

Of course, there is no certain definite formula for sharpening drill bits, and experience is needed in actual operation. Through comparison, observation and repeated testing, the drill bit will definitely be sharpened better.