Tips for grinding drill bits, what are the methods and techniques for grinding drill bits?

The correct way to grind the drill bit is as follows:1. First of all, remove the drill bit from the drill chuck, do not take the pistol drill to grind the drill bit together.

2. Hold the top part of the drill bit with your right hand and the tail of the drill bit with your left hand.

3. Make the top knife edge of the drill parallel to the grinding wheel of the grinder, and then grind against the grinding wheel.

4. When grinding, keep the position of the drill bit with the right hand, and move the tail of the drill slightly up and down with the left hand.

5. Grind one side of the knife edge, and then rotate 18 degrees to grind the knife edge on the other side.

The techniques and grinding methods for grinding drill bits are as follows:1. Check the status of the drill bit and mark the worn parts. See if its drill bit will be bent and if the knife edge is intact.

2. The cutting edge is flattened and the wheel is leaning, and it is sharpened by swinging up and down. Let the drill bit be close to the grinding wheel in a horizontal direction, but not yet in direct contact, and ensure that the "front angle" between the axis of the drill bit and the surface of the grinding wheel should be about 60°, and after finding the correct position, you can gently contact the grinding wheel.

3. Use after detailed inspection, daily maintenance and less loss. Finally, check the grinding of the drill bit to ensure that the incision is separated, and experiment first to ensure that the drill bit is stable and has little power when rotating.

Experience is accumulated slowly, don't rush it, and use more effort to figure it out in your work.

Take a look at how those masters grind...

Operation method: the position relationship between the drill bit axis line and the grinding wheel surface. The "sharp angle" is half of the top angle of 118° 2o, which is about 60°, which is very important and directly affects the size of the top angle of the drill bit, the shape of the main cutting edge and the bevel angle of the cross edge.

At this point, the drill bit is ready to contact the grinding wheel with the correct position.

The cutting edge of the drill begins to grind slowly along the entire flank face. This facilitates heat dissipation and sharpening. Consolidate the mantra in stability.

On the basis of one or two, the drill bit can be gently touched with the grinding wheel at this time to carry out a small amount of grinding, and the uniformity of the spark should be observed when grinding, the pressure should be adjusted in time, and the cooling of the drill bit should be paid attention to.

Skills: 1. The cutting edge should be flat with the grinding wheel surface. Before grinding the drill bit, the main cutting edge of the drill bit and the grinding wheel face should be placed on a horizontal plane, that is, the entire cutting edge should be ground when the cutting edge touches the grinding wheel surface.

This is the first step in the relative position of the drill bit and the grinding wheel, and then slowly lean against the grinding wheel face after the position is placed.

2. The axis of the drill bit should be oblique to the grinding wheel surface at an angle of 60°. This angle is the angle of the drill bit, and the angle is not correct at this time, which will directly affect the size of the top angle of the drill bit, the shape of the main cutting edge and the bevel angle of the cross edge.

Precautions for use:

A twist drill is a tool that drills a round hole in a workpiece by rotating the cut relative to its fixed axis. It is named because its chip groove is spiraled and resembles a twist. Spiral grooves have 2, 3, or more grooves, but 2 grooves are the most common.

Twist drills can be clamped on manual, electric, hand-held drilling tools or drilling, milling, lathes and even machining centers. The drill bit material is generally high-speed tool steel or cemented carbide.

The above content reference: Encyclopedia - twist diamond.

1. First of all, remove the drill bit from the drill chuck, do not take the pistol drill to grind the drill bit together. 2. Hold the top part of the drill bit with your right hand and the tail of the drill bit with your left hand. 3. Make the top knife edge of the drill parallel to the grinding wheel of the grinder, and then grind against the grinding wheel. 4. When grinding, keep the position of the drill bit with the right hand, and move the tail of the drill slightly up and down with the left hand. 5. Grind one side of the knife edge, and then rotate 180 degrees to grind the knife edge on the other side.

How to sharpen the drill bit, share with you a little trick, super practical.

When sharpening the drill bit, if the cutting edge of the drill bit is facing the axis of the grinding wheel, hold the front of the drill bit with your right hand and the back of the drill bit with your left hand. The right hand is held still, and the left hand holds the tail of the drill bit and swings it down to the left. In the whole process of grinding the drill bit, the drill tail must not be higher than the axis of the grinding wheel, otherwise the drill bit will not move.

The force used when grinding the drill bit should be from small to large, that is, when grinding backwards from the cutting edge, the force used is from small to large. When grinding the drill bit, be sure to make the top angle of the two cutting edges symmetrical, generally about 118°. After grinding the cutting edge on one side, rotate the drill 180° in the same position, and then grind the cutting edge on the other side.

If you want the hole to be drilled more round, you can grind the top angle smaller, that is, sharper, so that the drill bit is better centered when drilling, and the hole is relatively light. The two cutting edges should be the same length, and the angles of the two edges should be symmetrical, not one high and one low. The trailing angle of the cutting edge is generally between 8 12°, do not grind the cutting edge lower than the trailing angle, so the drill bit will not be able to drill.

In addition, the transverse edge of the drill bit should be narrowed, so that the axial resistance of the drill bit can be reduced when drilling, so that the drill bit can save a lot of effort when drilling down.

If the wear degree of the two sides is different, it means that the side with large wear is slightly higher than the other side. Attention should be paid to grinding a little more when grinding. The rotation of the grinding wheel should be stable, the circumferential surface should be flat, and the runout must be trimmed if the amount of runout is large.

When the edge on the outside of the drill bit is worn, the edge that has become dull should be ground off, otherwise there will be stuck drilling and sound. The pressure should not be too large when grinding, and it should be cooled by dipping it in water frequently to prevent overheating and annealing and reducing the hardness. Post-sharpening inspections can be done using a sample, but visual inspection is often used.

The cutting part of the drill bit is erected upwards, and the two eyes are level, because the two main cutting edges will produce parallax before and after each other, and often feel that the two cutting edges are one high and one low, and rotate 180 degrees to see it several times, as the result is the same, it shows symmetry. The same goes for the back angle, which can be seen at the same angle. The ground drill bit should be tested and then used after qualification.

Sharpening method: keep the main cutting edge on one side of the drill bit horizontal and slightly higher than the horizontal plane through the center of the grinding wheel during grinding, if the main cutting edge is not kept horizontal and the horizontal plane below the center of the grinding wheel will cause the main cutting edge to be arc or the flank face is high. The angle between the drill shaft and the grinding surface around the wheel is correct (half of the drill tip angle).

The right hand is in front, the left hand is in the back, hold the drill bit to contact the grinding surface around the grinding wheel, the right hand makes the drill bit rotate around its own axis according to the direction of rotation when working, apply appropriate pressure, the left hand cooperates with the right hand to make a synchronous downward pressing movement, and the pressure and amplitude of the left hand pressing down depends on the size of the subsequent angle. Large-diameter drill bits should be properly moved laterally, and the two should be rotated for grinding frequently. The drill tail should not swing beyond the horizontal plane to prevent the negative rear angle from being worn.

When the cutting edge is about to be sharpened, do not grind from the back of the blade to the direction of the cutting edge, so as to avoid annealing of the cutting edge. Small diameter drill bit, do not pick up the drill bit after grinding one side, directly turn to the other side to grind, because the position of the hand remains unchanged, so that the two main cutting edges of the drill bit are not easy to appear one high and one low. When grinding the cross-edge, the small-diameter drill bit is moved to the cross-cutting edge from the position on the outside of the flank face to the grinding wheel fillet and then to the cross-edge, which is easy to control the width and symmetry of the cross-edge, and it is not easy to control the amount of grinding without directly grinding the cross-edge.

Large-diameter drill bits can be used to shorten the cross edge directly with a grinding wheel round.

Tools Raw materials.

1. Drill bit to be grinded. There is no distinction between diameters and sizes.

2. Grinder.

Method steps.

1. Check whether the drill bit is bent and whether the knife edge is intact.

2. Hold one hand in the middle and front part of the drill bit, and this hand is used as 0 point, close to the middle of the grinding wheel of the grinder. Hold the tail of the drill bit with the other hand and move it up and down.

3. Sharpen the knife edge on both sides of the drill bit. Note that the two cuts must be the same length and can be measured with a ruler. If you are proficient, you can see it. It should also be noted that the angle between the center line of the drill bit and the knife edge is about 45 degrees.

4. After the measuring knife edge is grinded, it can be seen from the above picture that the center of the drill bit is a knife edge perpendicular to the center line of the drill bit, which hinders the downward movement of the drill bit when the drill bit is drilled, and the contact surface with the processed parts is large, resulting in the sliding of the drill bit and changing the drilling position. Here's what I do, as follows.

5. On another special slotted grinder, the transverse knife edge perpendicular to the center line of the drill bit is sharpened, which is my ingenious processing.

6. At this time, when you look down from the head of the drill bit, you can see that I have sharpened the two knife edges of the drill bit into four knife edges. The middle is pointed. That's the plus. When drilling, the drill bit is stable, the resistance is small, the positioning contact surface is small, and the hole is round.

7. Put into use. The iron filings that come out are formed, the drill bit shakes small, and the perfect drill bit is polished.

Precautions. 1. The grinding drill bit is a swinging drill bit up and down, not a rotating drill bit.

2. Reducing resistance and stability is the principle of position and maintaining the same size.

3. Pay attention to the grinder hurting your hands.

4. Pay attention to the feed should not be too large when you start using it. Consistent grinding at all times.