How to grind a knife in general? There should be six kinds of knives on the lathe.

I have been a lathe worker for more than 20 years, served as the instructor of lathe technicians, and now I am the technical director of the machining workshop of a large enterprise.

Turning tool should master its various angles. The main angles of the tool include rake angle, rake angle, auxiliary deflection angle and blade inclination angle. The function of each corner is:

The rake angle is the sharp effect when cutting; The greater the angle, the sharper the tool, but the weaker the tip strength, generally at 5-8.

Clearance angle-reduces the friction between the rake face and the workpiece during cutting. The larger the clearance angle, the smaller the friction force, but the smaller the tip strength, generally 3-5.

Main deflection angle-Control the ratio of axial force to radial force. Commonly used tools are 90, 45, 60, 75, etc. , mainly according to the actual processing situation. Usually, the angle refers to the main deflection angle.

Auxiliary deflection angle-reducing the friction between the auxiliary flank and the workpiece mainly depends on the tool itself and the machining requirements.

Blade inclination-mainly controls the direction of chip removal. When chip removal is backward, the secondary value is forward, and when it is 0, it is upward.

Knowing the angle of the tool can be sharpened according to the requirements of the workpiece material and the machined surface, most of which are hand-sharpened, and a grinder can be used if conditions permit.

For cemented carbide non-regrinding turning tools, grinding is generally not needed, just choose a suitable tool.

To grind turning tools well, we must practice more, constantly sum up experience in our work and master a certain theoretical basis. Practice makes perfect, and finally you can grind out a useful and durable car.