How to grind the drill bit well, how to grind the drill bit to be easy to use

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 and 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 drill bit axis and the grinding wheel surface 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.

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.

According to the different workpieces, the grinding method of the drill bit is also different, and the grinding method is also different for the same material with different thicknesses. It is difficult to teach you on the Internet, or buy a copy of the "Mechanical Cutting Manual" by yourself, and slowly explore it according to the content of the book, in short, to learn a technology, you must rely on yourself to practice more, summarize experience, in order to practice this technology of self-learning.

To mention a few references, you can refer to the manual for the name of each part and the grinding method, which cannot be said here.

1.Trim the blade shorter, but not the other. It can reduce the feed resistance.

2.Take advantage of the opportunity to shorten the crossblade and try to improve the negative rake angle at the crossblade. Increasing the rake angle at this point reduces the cutting force and makes drilling light.

3.A large variable rear angle is adopted. Reduces frictional resistance and makes drilling light and fast.

4.Reduce the apex angle. Usually, the feed pressure of the hand drill is insufficient, and appropriately reducing the top angle can increase the positive pressure of the cutting edge on the cutting surface, which is the same as the V-belt drive. But too small will affect the rake angle angle of the cutting edge.

5.Holes with loose requirements for hole diameter and roughness can properly keep the two edges slightly unbalanced. In this way, the hole diameter of the hole is slightly larger, which reduces the friction between the cutting edge and the hole wall.

The correct way to grind the drill bit: check the status of the drill bit, mark the worn parts, swing the cutting edge flat wheel face against it, swing up and down to grind it into a tip, use it after checking the details, and reduce daily maintenance and loss.

1. Check the status of the drill bit and mark the worn parts.

When grinding the drill bit, we must first check the wear and tear of the drill bit, to see if its drill bit will be bent and bent, whether the knife and diamond mouth are intact, and some of the more serious wear and tear parts must be better, in the process of grinding the drill bit, you can focus on grinding and improving efficiency.

2. The cutting edge is flattened and the wheel is leaning, and it is sharpened by swinging up and down.

The second step is to align the drill bit with the grinding wheel, so that the drill bit is close to the grinding wheel in a horizontal direction, but it cannot be directly contacted, and ensure that the "front angle" between the drill bit axis line and the grinding wheel surface should be about 60 °.

In this process, it is necessary to remember that it is swinging up and down and a lot of rotating the drill bit, one hand fixes the drill bit, and the other hand holds the tail of the drill bit to swing up and down, during which the knife edge on both sides of the drill bit should be observed, and the knife edge should be measured with a ruler in the early stage to ensure that the length of the knife edge is consistent.

3. Use after detailed inspection, daily maintenance and less loss.

Finally, check the grinding situation of the drill bit to ensure the separation of the incision, and first experiment, to ensure that when rotating, the drill bit is stable and the power is small, and the iron filings that come out are also formed, which proves that the drill bit has been grinded.

Drill bit classification:

1. Diamond: The cutting edge uses a diamond material drilling tool is a diamond drill bit, the main advantage of the diamond drill bit is that it can adapt to the formation with high abrasiveness and hard geology, and the cutting performance is also relatively good. It has very significant advantages in high-speed drilling.

2. Cone gear: Based on the structure of the cone bit, it can be divided into five parts: water eye, bearing, palm, cone and drill bit body. In the case of hermetically sealed jet cone bits, the oil storage compensation system is also included in the case.

The thread will generally be in the upper part of the cone bit, the drill string and the thread are connected to each other, and there will be a cone in the lower part of the drill bit, which has three palms, and the cone shaft is equipped with a cone wheel, and a bearing is installed between the cone shaft and each cone wheel.

The cone cone does the work of crushing the rock with its own cutting teeth. The channel of the drilling fluid is the water hole of the drill bit. In the process of oil drilling, through the transverse shear and longitudinal vibration in the drilling process, the cone bit will achieve the purpose of breaking the rock, so as to increase the drilling speed.

The methods and techniques for grinding drill bits are as follows:

1. Before grinding the drill bit, the main cutting edge of the drill bit and the grinding wheel surface should be placed on a horizontal plane, that is, to ensure that when the cutting edge touches the grinding wheel surface, the entire cutting edge must be grinded. 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 angle of the drill bit is very important, if it will directly affect the size of the top angle of the drill bit and the shape of the main cutting edge and the bevel angle of the cross edge. This refers to the position relationship between the axis line of the drill bit and the surface of the grinding wheel, which is 60°, which is generally more accurate. Here we should pay attention to the relative horizontal position and angle position of the drill bit before grinding, and the two should be taken into account, not to ignore the degree angle in order to level the cutting edge, or to ignore the leveling edge in order to set the angle.

3. After the cutting edge of the drill bit contacts the grinding wheel, it should be ground from the main cutting edge to the back, that is, from the cutting edge of the drill bit, it will first contact the grinding wheel, and then slowly grind down along the entire flank face. When the drill bit is cut, you can gently contact the grinding wheel, first carry out a small amount of grinding, and pay attention to the uniformity of the spark, adjust the pressure on the hand in time, and pay attention to the cooling of the drill bit, so that it can not be ground too much, resulting in discoloration of the cutting edge, and annealing of the cutting edge. When the cutting edge temperature is found to be high, the drill bit should be cooled in time.

4. After grinding one side of the cutting edge, and then grinding the other cutting edge, it is necessary to ensure that the cutting edge is in the middle of the drill bit axis, and the cutting edges on both sides should be symmetrical. An experienced master will look at the bright light to check the symmetry of the drill head and grind it slowly. The rear angle of the cutting edge of the drill bit is generally 10°-14°, the rear angle is large, the cutting edge is too thin, the vibration is strong during drilling, the orifice is three-sided or pentagonal, and the chips are needle-shaped; The back angle is small, the axial force is very large when drilling, it is not easy to cut in, the cutting force increases, the temperature rise is large, the drilling hair is hot, and even unable to drill.

5. After the two edges are sharpened, pay attention to sharpening the tip of the drill bit with a larger diameter. After the two edges of the drill bit are sharpened, there will be a plane at the tip of the two edges, which affects the center positioning of the drill bit, and it is necessary to reverse the angle behind the blade to grind the plane of the tip of the blade as small as possible. The method is to hold the drill upright, aim it at the corner of the grinding wheel, and pour a small groove at the root behind the blade against the tip of the blade.

This is also an important point for drill bit centering and cutting lightness.