Rake angle of numerical control tool
Generally speaking, the rake angle has a great influence on cutting force, chip discharge and tool durability.
The influence of rake angle of NC tool
1) Large positive front angle and sharp cutting edge;
2) The cutting power decreases by 1% with the increase of front angle by 1 degree.
3) If the positive rake angle is too large, the edge strength decreases; if the negative rake angle is too large, the cutting force increases.
Large negative rake angle of NC cutter
1) Cutting hard materials;
2) The cutting edge should be strong enough to adapt to the intermittent cutting and the processing conditions of cutting the surface layer containing black skin.
Large positive front angle for
1) Cutting soft materials;
2) Free cutting materials;
3) When the rigidity of machined materials and machine tools is poor.
Benefits of rake angle cutting with NC tools
1) Because the front angle can reduce the resistance encountered in cutting, the cutting efficiency can be improved.
2) It can reduce the temperature and vibration generated during cutting and improve the cutting accuracy.
3) Reduce tool wear and prolong tool life;
4) When choosing the right cutting tool material and cutting angle, the use of rake angle can reduce tool wear and enhance the reliability of the cutting edge.
Excessive front corner
1) Because the increase of the rake angle will reduce the angle and cutting efficiency of the cutting tool to cut into the workpiece, if the rake angle is too large, the tool will easily wear and even collapse when cutting the workpiece with higher hardness.
2) When the material of the cutting tool is weak, the reliability of the cutting edge can hardly be maintained.
CNC Tool Back Angle You, CNC Machining
The rear angle reduces friction between the back of the cutter and the workpiece, and enables the cutter to cut into the workpiece freely.
Effect of Back Angle of NC Tool
1) Large rear angle, small positive wear of the rear knife
2) The strength of the tool tip decreases when the rear angle is large.
Small rear angle for
1) Cutting hardness material;
2) When cutting strength is high.
Large rear angle for
1) Cutting soft materials
2) Cutting materials that are easy to work and harden.
Benefits of Back Angle Cutting
1) Large rear angle cutting can reduce the wear of the flank, so it is better to prolong the life of the tool when the front angle loss does not increase sharply.
2) Generally speaking, it is easier to dissolve in cutting ductile and softer materials. Solution can increase the back angle and the contact surface of the workpiece, increase the cutting resistance and reduce the cutting accuracy. Therefore, if such materials are cut with a larger rear angle, the occurrence of this situation can be avoided.
Limitation of Back Angle Cutting of NC Tools
1) When cutting materials with low heat transfer, such as titanium alloy and stainless steel, the use of large rear angle cutting will make the rake face prone to wear, and even tool damage. Therefore, large rear angle is not suitable for cutting this type of material.
2) Although the use of large rear angle can reduce the wear of the flank, it will accelerate the decay of the blade. Therefore, the cutting depth will be reduced and the cutting accuracy will be affected. For this reason, technicians need to adjust the angle of the tool regularly to maintain the cutting accuracy.
3) When cutting materials with high hardness, if the large rear angle is too large, the resistance encountered in cutting will cause the front angle to be damaged or damaged due to the strong compressive force.
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