It is an effective solution to reduce the cost of machining to effectively apply different parts of turning NC tools. Therefore, in addition to the material of the tools, it is also necessary to understand the geometric angle of the NC tools. However, the range of cutting geometry rate design is quite wide. Now we mainly focus on the application of the most common cutting angles of front angle back angle the influence of them on cutting.

Front angle of CNC tool

Generally speaking, the front angle has a great influence on cutting force, chip discharge tool durability.

The influence of the front angle of NC tool

1) Large front angle, sharp cutting edge;

2) The cutting power decreases by 1% for every 1 degree increase of rake angle;

3) If the positive rake angle is too large, the blade strength will decrease; if the negative rake angle is too large, the cutting force will increase.

The large negative rake angle of NC tool is used for

1) Cutting hard materials;

2) In order to adapt to the intermittent cutting the machining conditions of the surface layer with black skin, it is necessary to have a strong cutting edge.

Large front angle for

1) Cutting soft materials;

2) Free cutting materials;

3) When the rigidity of the processed material machine tool is poor.

The advantage of using CNC tool in front angle cutting

1) The use of rake angle can reduce the resistance encountered in cutting, so it can improve the cutting efficiency;

2) It can reduce the temperature vibration during cutting improve the cutting accuracy;

3) Reduce tool loss prolong tool life;

4) When choosing the right tool material cutting angle, using the front angle can reduce the tool wear enhance the reliability of the blade.

The front corner is too big

1) Because the increase of rake angle will reduce the angle efficiency of cutting tool, if the rake angle is too large, the tool is easy to wear even collapse when cutting the workpiece with high hardness;

2) When the tool material is weak, the reliability of cutting edge is difficult to maintain.

Back angle of NC tool

The back angle reduces the friction between the back of the tool the workpiece, enables the tool to cut into the workpiece freely.

The influence of back angle of NC tool

1) Large rear angle, small positive wear of rear knife

2) When the back angle is large, the strength of the tip decreases.

Small back angle for

1) Cutting hard materials;

2) When cutting strength is high.

Large back angle for

1) Cutting soft materials

2) Cutting materials that are easy to work harden.

Benefits of rear corner cutting

1) The cutting with large back angle can reduce the wear of the back cutting face, so when the front angle loss does increase sharply, the use of large back angle small back angle can prolong the service life of the tool;

2) Generally speaking, when cutting ductile softer materials, it is easier to dissolve. Melting will increase the back angle the contact surface of the workpiece, increase the cutting resistance reduce the cutting accuracy. Therefore, if the material is cut with a large back angle, this situation can be avoided.

The limitation of back angle cutting of NC tool

1) When cutting materials with low heat transfer, such as titanium alloy stainless steel, the use of large back angle cutting will make the front cutter face easy to wear, even the cutter will be damaged. Therefore, large back angle is suitable for cutting this type of material;

2) Although the use of large back angle can reduce the wear of the back face, it will accelerate the decline of the blade. Therefore, the cutting depth will be reduced, which will affect the cutting accuracy. For this reason, technicians need to adjust the angle of cutting tools regularly to maintain the cutting accuracy;

3) When cutting high hardness materials, such as large back angle, the resistance encountered in cutting will cause the front angle to be damaged damaged due to strong compression force.