Geometric Angle Characteristics of CNC Machining Tools in Machining Field


Author: MULAN -Plastic Molding Manufacturer

Effectively applying turning to process different parts of CNC tools is an effective solution to reduce processing costs. Therefore, to choose a suitable CNC tool, in addition to the material of the tool, it is also necessary to understand the geometric angle of the CNC tool. However, the scope of cutting geometry rate design is quite wide. Now we mainly focus on the application of rake angle and relief angle Z common cutting angle and the influence of the two on cutting. Rake angle of CNC tools Generally speaking, the rake angle has a great influence on cutting force, chip discharge and tool durability.

The influence of the rake angle of CNC tools 1) The positive rake angle is large, and the cutting edge is sharp; 2) The cutting power is reduced by 1% for every increase of the rake angle; 3) The positive rake angle is too large, and the strength of the blade decreases; Larger, the cutting force increases. The large negative rake angle of the CNC tool is used for 1) cutting hard materials; 2) the strength of the cutting edge is required to adapt to the processing conditions of intermittent cutting and cutting the surface layer containing black skin. Large positive rake angle is used for 1) cutting soft materials; 2) easy-cutting materials; 3) when the material to be processed and the rigidity of the machine tool are poor.

The benefits of using the rake angle cutting of CNC tools 1) Since the use of the rake angle can reduce the resistance encountered during cutting, it can improve cutting efficiency; 2) It can reduce the temperature and vibration generated during cutting and improve cutting accuracy; 3) Reduce tool loss and prolong tool life; 4) When choosing the correct tool material and cutting angle, using the rake angle can reduce tool wear and enhance the reliability of the cutting edge. 1) The increase of the rake angle will reduce the cutting angle of the tool and the cutting efficiency of the workpiece. Therefore, when cutting workpieces with high hardness, if the rake angle is too large, the tool is prone to wear and even chipping 2) When the material of the tool is weak, it is difficult to maintain the reliability of the cutting edge. Relief angle of CNC tool The relief angle reduces the friction between the back of the tool and the workpiece, so that the tool can freely cut into the workpiece.

The influence of the back angle of the CNC tool 1) Larger back angle, less positive wear of the back tool 2) Larger back angle, lower tool tip strength. Small relief angle is used for 1) cutting hard materials; 2) when high cutting strength is required. Large relief angle is used for 1) cutting soft materials and 2) cutting materials that are easy to work harden.

Benefits of cutting with a large relief angle 1) Cutting with a large relief angle can reduce the wear of the flank surface, so when the loss of the rake angle does not increase sharply, using a large relief angle and a small relief angle can prolong the life of the tool; 2) General and In other words, it is more prone to fusion when cutting ductile and softer materials. Melting will increase the back angle and the contact surface of the workpiece, increase the cutting resistance and reduce the cutting accuracy. Therefore, if cutting such materials with a larger clearance angle, this situation can be avoided.

Restriction of CNC tool back angle cutting 1) When cutting materials with low heat conductivity such as titanium alloy and stainless steel, cutting with a large back angle will make the rake face prone to wear and even tool damage. Therefore, a large relief angle is not suitable for cutting this type of material; 2) Although the use of a large relief angle can reduce the wear of the flank face, it will accelerate the decline of the cutting edge. Therefore, the depth of cut will be reduced accordingly, affecting the cutting accuracy.

For this reason, technicians need to adjust the angle of the tool regularly to maintain cutting accuracy; 3) When cutting high-hardness materials, if the large rear angle is too large, the resistance encountered during cutting will cause the rake angle to be subjected to strong force. Chipping or breakage due to compression.

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