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Geometrical Angle Characteristics Of CNC Machining Tools

Geometrical Angle Characteristics Of CNC Machining Tools

The most direct and effective way to reduce the processing cost is to effectively apply the turning to process different parts of the CNC tool. Therefore, in order to select the most suitable CNC tool, in addition to selecting the appropriate tool material, it is also necessary to understand the geometric characteristics of the CNC tool. However, due to the wide range of cutting geometries involved, we now mainly focus on the application of cutting angles, which are the most commonly used rake angles and rake angles, and the effects of both on cutting.

CNC tool rake angle

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) Large positive rake angle and sharp cutting edge;
  • 2) When the rake angle is increased by 1 degree, the cutting power (referring to the work done by the object in unit time) is reduced by 1%;
  • 3) If the positive rake angle is too large, the strength of the blade will decrease; if the negative rake angle is too large, the cutting force will increase.

The large negative rake angle of the CNC tool is used

  • 1) Cutting hard materials;
  • 2) High cutting edge strength is required to adapt to intermittent cutting and the processing conditions of cutting the surface layer containing black skin.

The large positive rake angle is used

  • 1) Cutting soft materials;
  • 2) Free cutting materials;
  • 3) When the rigidity of the machined material and machine tool is poor.

Benefits of cutting with CNC tools

  • 1) Since the use of rake angle can reduce the resistance encountered during cutting, it can improve the cutting efficiency;
  • 2) It can reduce the temperature and vibration generated during cutting and improve the cutting accuracy;
  • 3) Reduce tool wear and prolong tool life (lifetime);
  • 4) When choosing the right tool material and cutting angle, using a rake angle can reduce tool wear (a basic type of component failure) and enhance the reliability of the blade.

Bad outside of the front corner is too large

  • 1) Since the increase of the rake angle will reduce the angle and efficiency of the cutting tool into the workpiece, when cutting a workpiece with a higher hardness, if the rake angle is too large, the tool will be prone to wear (parts failure Kinds of basic types), even the situation of chipping;
  • 2) When the tool material is weak, the reliability of the cutting edge is difficult to maintain.

CNC tool back angle

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. In numerical control processing, the control system sends out instructions to make the cutter perform various movements that meet the requirements, and expresses the processing of technical requirements and processing requirements such as the shape and size of the workpiece in the form of numbers and letters. It generally refers to the process of processing parts on CNC machine tools. In order to improve production automation, shorten programming time and reduce CNC machining costs, a series of advanced CNC machining technologies have also been developed and used in the aerospace industry.
The influence of the back angle of CNC tools

  • 1) The back angle is large, and the back knife is wearing little
  • 2) The back angle is large, and the blade tip strength is reduced.

Small back angle for

  • 1) Cutting hardness (Hardness) material;
  • 2) When the cutting strength (strength) is high.

Large back angle for

  • 1) Cutting soft materials
  • 2) Cutting materials that are easy to work harden.

Benefits of back angle cutting

1) Large clearance angle cutting can reduce the wear of the flank face (a basic type of component failure), so when the rake angle loss does not increase sharply, using a large relief angle and a smaller relief angle can extend the life of the tool ;
2) Generally speaking, when cutting ductile and soft materials, it is easier to cause sintering. In numerical control processing, the control system sends out instructions to make the cutter perform various movements that meet the requirements, and expresses the processing of technical requirements and processing requirements such as the shape and size of the workpiece in the form of numbers and letters. It generally refers to the process of processing parts on CNC machine tools. In order to improve production automation, shorten programming time and reduce CNC machining costs, a series of advanced CNC machining technologies have also been developed and used in the aerospace industry. Fusion will increase the contact angle of the back angle and the workpiece, increase the cutting resistance, and reduce the cutting accuracy (accuracy). Therefore, when cutting such materials with a large clearance angle, this situation can be avoided.
Restriction of cutting angle of CNC tool

  • 1) When cutting materials with low heat transfer properties such as titanium (Ti) alloys and stainless steel (stainless acid-resistant steel), cutting with a large back angle will make the rake face prone to wear (a basic type of component failure) , There will even be broken tools. Therefore, the large clearance 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 (a basic type of component failure), it will accelerate the decline of the blade. In numerical control processing, the control system sends out instructions to make the cutter perform various movements that meet the requirements, and expresses the processing of technical requirements and processing requirements such as the shape and size of the workpiece in the form of numbers and letters. It generally refers to the process of processing parts on CNC machine tools. In order to improve production automation, shorten programming time and reduce CNC machining costs, a series of advanced CNC machining technologies have also been developed and used in the aerospace industry. Therefore, the cutting depth of the cutting will be reduced accordingly, affecting the cutting accuracy (accuracy). To this end, technicians need to regularly adjust the angle of the tool to maintain the cutting accuracy;
  • 3) When cutting high-hardness materials, if the large back angle is too large, the resistance encountered during cutting will cause the front angle to be damaged or damaged due to the strong compression force.

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