Why does the drill bit have a transverse edge, and what is the function of the transverse blade in t

It is the head of the drill that performs the cutting role, and its cutting edge part and the transverse edge function as a tool. In order to ensure that the conical surface of the cutting part does not touch the workpiece and has a trailing angle, the value of the trailing angle should be appropriately selected according to the workpiece material.

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The cutting edge formed by the intersection of the two main flank faces, that is, the line of the two main cutting edges, is the transverse edge. The transverse edge is through the drill bar line, and it is projected as a straight line on the drill end face, so the base surface of each point on the transverse edge is the same. The rake angle of the transverse blade is negative.

Since the transverse edge has a large negative rake angle, a large cylindrical force is generated when working. The cross edge is too short, which affects the strength of the drill head; Too long back is an increase in the cylindrical force, which is not good for the drill bit.

The angle between the cross edge and the main cutting edge is the bevel angle of the cross edge. Its size is determined by the trailing angle, when the trailing angle is large, the bevel decreases and the transverse blade becomes longer: the trailing angle is the opposite.

How to get out of the cutting waste without opening the cross edge...

1. The main function of the transverse edge of the drill bit is centering.

2. When the borehole is rotten, the maximum axial force is also generated by the transverse edge.

3. Therefore, when sharpening the drill bit, the horizontal edge should be sharpened narrower, so as to reduce the axial force when drilling as much as possible, so that the drilling can be more relaxed.

4. When drilling with a bench drill or hand drill, it feels particularly obvious.

1. There will be a drill tip after the cross-edge grinding, and the centering effect will be fixed when feeding, that is, if your center is not ground correctly, the hole diameter will be large or biased to a certain extent.

2. The angle of the cross blade can check whether the rear angle and front angle of the drill bit are correct, because the larger the angle of the cross edge, the front angle at the drill center increases, the rear angle decreases, the cutting environment becomes worse, and the angle is too small, which will lead to grinding off the cutting edge at the drill core of another cutting edge, resulting in the inability to cut or the cutting resistance becomes greater.

3. The length of the transverse blade can determine the size of the pre-cutting force, when other parameters remain unchanged, the longer the transverse blade, the greater the cutting resistance, and vice versa.

But the answer is that Sun has a degree in everything, the horizontal blade is too short, the knife edge is sharp, and the strength of the knife edge becomes smaller.

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.

There are several points that need to be paid attention to in the sharpening of twist drills, first of all, to ensure that the correct rear angle is grinded, the length and angle of the two main cutting edges should be symmetrical, there is a mantra: the drill edge is flat and the wheel is leaning, and the drill shaft is oblique to the left of the front angle. Grind the back angle from the blade to the back, and swing the tail up and down.

If necessary, the transverse edge can be resharpened, the wiper blade can be sharpened and the chip groove can be opened, and the cooling should be carried out during the grinding process to avoid the annealing of the cutting edge.

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.

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.