End mill that can do various milling processing with one bottle. It is a standard tool that efficiently cuts the work using the "outer blade" on the side of the tool, such as the side of the work but also the side, steps, and grooves, and the bottom blade on the bottom. In this article, we will explain the issues generated by milling using end mills and the points you want to keep for efficient processing.
End milled milling has the following tasks. Processing due to scaring occurs There is no life of tools
Vibration of work and end -mill may cause chattering and processing accuracy may be reduced. Various factors, such as the main axis, tool holder, jigs, cutting powder, and cutting conditions, are overlapped. In addition, the lack of rigidity of the machine and aging may cause chattering. It is necessary to check where the vibration is generated by sounding and touching.
Since the end mills are frequently used, tool life is an issue for highly productive NC machine tools. The life of the life depends on the presence or absence of coating and the number of re -polishing, but if the tools are quickly worn, the end mill of the throwing away (chip replacement type) is also considered. Slow -away mill is a separate body, which is a separate body, which is a separate body that fixes a cutting blade called insert with screws or pressed money.
Side milling processing is a processing method that efficiently cuts the side and outer periphery of the metal. It is common for processing to use the "outer blade" on the side of the end mill. There are the following issues in the side milling processing using the end mill. Processing is generated due to falling tools The processing surface becomes rough
If the cut blade in contact with the work is long, the cutting resistance may escape the end mill so that the end mill falls from the work and the processing may be poor.
Side milling with long cut blades has a large cutting resistance and may be rough.
There are the following measures to suppress the waving of milling and improve the tool life.
Adjusting the cutting conditions such as "cut amount" and "sending speed", and reducing the cutting resistance to reduce the occurrence of chattering. Generally, the larger the cutting amount and the sending speed, the more likely it is to generate scarce, and the processing surface becomes rough. Balance is important because the cutting conditions vary greatly depending on the work material and used tools.
By shortening the protruding of the end mill, it suppresses the occurrence of chattering due to the swing and flashing of the tools. Depending on the processing shape such as the groove and pockets, care must be taken because the tool holder and the work interfere. If you have to use a long tool, it is a good idea to use a thick holder, Aber, which has little interference.
By reducing the number of blades hitting the work, the cutting resistance is reduced and the occurrence of chattering is suppressed. Depending on the work shape, it is also effective to divide the processing into multiple times by "multi -stage processing". If you have to use a tool with a large number of blades, you can cut it down and adjust the rotation speed to suppress the chattering.
The use of a tool holder with high rigidity and holding power suppresses the occurrence of end mill. In particular, heavy -cuts such as mold processing are also the point of the main axis and rigidity around the shank.
Correct cutter paths and cheating generations during processing are important factors that guarantee stable blades and long tool life in milling.
By cutting into the work while drawing a curve (roll -in approach), the load at the start of the cutting is minimized and the wear of the tool is suppressed.
During processing, the end mill always contacts the work and reduces the number of cuts. Reducing the load on the tools leads to improving the life of the edge of the blade.
Side milling processing by end mills has the following measures.
Reduce the amount of sending per blade and reduce the cut depth to reduce the cutting resistance and prevent falling.
By using high -rigidity such as carbide, it reduces cutting resistance and prevents falling.
There are various approaches for improving processing aspects. The point of improving the processing surface is how to reduce the cutting resistance.
By keeping the cutting fee constant, the cutting resistance is stable and the processing surface is improved.
The use of short protruding tools to suppress the occurrence of chattering and improve the processing surface. In addition, cutting resistance can be considered as three directions. Send power: horizontal stress. Determine the size of the sending power required for cutting. Back force: axial division of force. As it gets bigger, the work accuracy is reduced. Divided force: Powerful force and dividend working in the vertical direction. It affects the amount of fever during cutting. Based on the understanding of the distributed force, it is also considered to review the cutting conditions according to the situation.
In a milling process using the end mill, it is also important to use the end milled according to the cutting point. The table below is the characteristics and usage of the frequently used end mill. The shape feature of the type blade and the use flat end -milled blade tip are highly versatile, the radius end mill, such as plane, sides, steps, and groove processing, high round strength on the tip of the blade, curved surface processing and mold processing, etc. The ball end mill blade tip is spherical Low cutting resistance, mold processing and 5 -axis processing, such as rafing end mill with good exhausting uneven flour, rough processing, etc.
End mills are classified by the number of blades, such as "one -blade", "two -blade", and "multi -blade". The larger the number of blades, the higher the rigidity and the higher the processing accuracy, but it is necessary to be careful because the drainage of the powder is worse.
In this article, we explained the tasks generated by milling using end mills and the points you want to keep. Although it is an end -mill of a universal tool, using a number of end mills according to the characteristics of processing from rough to finish is the key to accuracy improvement.
