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Characteristics of front and rear angles of CNC machining tools

by:QY Precision      2020-03-13
For a hardware processing factory, the most direct and effective way to reduce CNC machining costs is to effectively apply different parts of CNC machining tools. When we select CNC machining tools, in addition to selecting the appropriate tool material, we also need to understand the impact of the application of the front and back corners of CNC machining tools on machining. Generally speaking, the front angle of CNC tools has a great influence on cutting force, chip discharge and tool durability. The influencing factors are as follows: 1. The front angle is large and the cutting edge is sharp; 2. For every 1 degree increase in the front angle, the cutting power will be reduced by 1%; 3. The front angle is too large and the Blade strength decreases; The negative front angle is too large, and the cutting force increases. The front angle of CNC tool is divided into: 1. Big negative front angle, 2. Big front corner. 1. Large negative front angle is generally used for cutting hard materials; The cutting edge strength is required to adapt to intermittent cutting and the processing conditions of cutting the surface layer containing black skin. 2. Large front angle is generally used for 1)Cutting soft material; Easy cutting material; When the rigidity of the processed materials and machine tools is poor. Let's talk about the benefits of CNC cutting tool front angle and the disadvantages of too large front angle. 1. Benefits of front angle cutting: because the front angle can reduce the resistance encountered during cutting, the cutting efficiency can be improved; It can reduce the temperature and vibration generated during cutting and improve the cutting accuracy; Reduce tool loss and prolong tool life; When selecting the correct tool material and cutting angle, using the front angle can reduce the wear of the tool and enhance the reliability of the blade. 2. The disadvantage of excessive front angle: because the increase of front angle will reduce the angle and cutting efficiency of the tool cutting into the workpiece, if the front angle is too large, the tool will easily wear out, even there was a knife collapse; When the material of the tool is weak, the reliability of the cutting edge is difficult to maintain. About the back angle of CNC tool in general, the back angle reduces the friction between the back of the tool and the workpiece, so that the tool has the function of freely cutting into the workpiece. The influencing factors are as follows: 1. The rear angle is large and the rear knife is worn out; 2. The rear angle is large and the strength of the tip decreases. The rear angle of CNC tool is divided into: 1. Small back angle, 2. Big back corner. 1. The Small Back angle is generally used for cutting hardness materials; When the cutting strength is high. 2. The large rear angle is generally used for cutting soft materials; Cutting materials that are easy to process and harden. Finally, let's talk about the benefits of CNC tool back angle cutting and the limitations of back angle cutting. 1. Advantages of rear angle cutting: large rear angle cutting can reduce the wear of the rear cutter surface, so the life of the cutter can be prolonged by using a large rear angle with a smaller rear angle without a sharp increase in front angle loss; Generally speaking, it is easier to dissolve when cutting extensibility and softer materials. Dissolution increases the contact surface of the rear angle and the workpiece, increases the cutting resistance and reduces the cutting accuracy. Therefore, this situation can be avoided if such materials are cut at a larger rear angle. 2. Limitation of rear angle cutting: when cutting materials with low heat transfer such as titanium alloy and stainless steel, using large rear angle cutting will make the front tool surface easy to wear and even cause tool damage. Therefore, the large rear angle is not suitable for cutting this type of material; Although the use of a large rear angle can reduce the wear of the rear blade surface, it will accelerate the decline of the blade. Therefore, the cutting depth of the cutting will be reduced accordingly, affecting the cutting accuracy. For this reason, technicians need to adjust the angle of the tool regularly to maintain the cutting accuracy; When cutting materials with high hardness, if the large rear angle is too large, the resistance encountered during cutting will cause the front angle to be defective or damaged due to strong compression force.
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