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How to choose the angle of use of guillotine knives?

Update:01 Jun 2018
Summary:

Cemented carbide inserts are widely used as cutting too […]

Cemented carbide inserts are widely used as cutting tools in modern production and manufacturing. The choice of insert angle should be based on the principle of meeting the best use requirements, which is mainly reflected in the following aspects.
1. Front corner
The forefoot is large, the plastic deformation of the cutting layer is small, the frictional resistance of the cutter and the swarf is small, the cutting force and the cutting heat can be reduced, but if the rake angle is too large, the strength of the cutting edge and the alloy cutter head is reduced, the heat dissipation condition is deteriorated, and the tool life is reduced. The angle is small, the chip deformation increases, and the chip breaking is easy. The size of the rake angle is the same as other set parameters and should be selected according to the processing requirements. The selection principle is:
a. The lower the strength and hardness of the workpiece material, the better the plasticity, the larger rake angle should be taken; the processing of brittle materials (
If the material is short (such as cast iron) or knife-chip contact length (such as titanium alloy), should be taken to a smaller rake angle; processing of special hard materials (such as hardened steel, chilled cast iron) can even take a negative rake angle.
b. The higher the bending strength and toughness of the tool material, the larger the rake angle may be.
c. When forgings or castings with crusts are intermittently machined or rough-processed, the rake angle should be reduced appropriately. However, if there is a large negative-angled-angled fit at this time, a larger rake angle may be used to reduce the radial cutting force. .
d. In high-speed cutting, the rake angle has less influence on the chip deformation and cutting force, and it may take a smaller rake angle.
e. The rake angle of the shaped carbide tool should be selected according to the specific machining requirements.

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