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How to choose the right milling cutter and milling method for CNC machining?

Time：

2020-02-10 10:54

Choosing the right milling tool, rolling in the face milling process, and hole milling with a milling cutter when conditions are suitable, manufacturers can greatly increase production capacity and increase processing efficiency without investing in new equipment Save a lot of time and costs.
 
When selecting a milling cutter that is suitable for the machining task, various issues such as the geometry, size and workpiece material of the machined part must be considered.
 
Milling rake angle
 
The main deflection angle is the angle between the cutting edge and the cutting plane. The main declination has a great influence on the radial cutting force and cutting depth. The magnitude of the radial cutting force directly affects the cutting power and the vibration resistance of the tool.
 
The smaller the main deflection angle of the milling cutter, the smaller the radial cutting force and the better the vibration resistance, but the cutting depth also decreases.
 
A 90 ° main deflection angle is used when milling the plane with square shoulders. This type of tool has good versatility and is used in single piece and small batch processing. Because the radial cutting force of this type of tool is equal to the cutting force, the feed resistance is large, and it is easy to vibrate. Therefore, the machine tool is required to have large power and sufficient rigidity.
 
When machining planes with square shoulders, a milling cutter with a 88 ° deflection angle can also be selected. Compared with 90 ° main deflection milling cutter, its cutting performance has been improved. 90 ° square shoulder milling cutters are also common for face milling. In some cases, this choice is justified. Square-milled cutters may be the best choice for milling workpieces with irregular shapes or casting surfaces that can cause changes in depth of cut. In other cases, a standard 45 ° face milling cutter may benefit more.
 
When the cutting angle of the milling cutter is less than 90 °, the thickness of the axial chips will be smaller than the feed rate of the milling cutter due to the thinning of the chips. The cutting angle of the milling cutter will have a great influence on the feed per tooth that it is suitable for.
 
In face milling, a face milling cutter with a 45 ° entry angle makes the chip thinner. As the cutting angle decreases, the chip thickness will be less than the feed per tooth, which in turn can increase the feed rate to 1.4 times the original. The radial cutting force of the 45 ° main deflection milling cutter is greatly reduced, which is about equal to the axial cutting force. The cutting load is distributed on the longer cutting edge. Longer processing occasions. When machining planes with this type of tool, the breakage rate of the insert is low and the durability is high; when machining cast iron parts, the edge of the workpiece is not prone to chipping.

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