The configuration edge is a phenomenon in which the cut powder is welded at the tip of the edge by the high pressure and frictional heat, which acts as a cutting edge. If you cut aluminum or fluffy steel, which is an extension material, at a relatively low speed, a part of the covering material adheres to the edge of the cutting edge due to the physical and chemical changes in the cutting material in the cutting part, so that a new edge has been created.
I will behave. The welded configuration blade is very hard because it is processed and cured, and it cuts the work on the edge of the blade, which causes the quality of the finish surface and the tip of the edge of the blade. This article explains the cause of the development of the configurated blade in cutting and the countermeasures.
The following issues arising from the configuration blades include the following. Reduced quality of finishing surface Dimensional accuracy Tip and tool life reduction.
The welding of the tip of the configurated blade reduces the sharpness of the edge of the blade, reducing the quality of the finishing surface. If the tip of the configuration is completely covered with the edge of the blade, the work material itself will cut the work surface, so the shape of the configurated blade will be transferred to the metal surface. Not only that, but the sharpness is so sharp that the work is removed. In other words, the quality of the finishing surface gets worse.
The larger the configuration blade, the larger the cut amount, and the dimensional accuracy is reduced. The configuration edge is repeatedly occurring, growth, and dropping during processing, so the cut -and -quantity horns change constantly.
The configuration blade tip is strongly welded on the edge of the blade, so it may cause deficiency and chips when dropping off. The configuration blade grows with cutting, and repeats the cycle of falling after a certain extent. Therefore, when the tip of the configuration comes off, it comes off to the edge of the blade. In order to prevent the loss of the edge of the blade during processing, pre -measures for the configuration blade tip are required.
The configuration tip occurs in the following situations. When processing an extension material If the temperature of the cutting point is low If the affinity of the tool and the work is high
Endoplaces such as soft steel (easy -to -extend materials) are not divided into the remaining cut powder due to cutting heat, making it easier to generate a configuration blade. (Example of extension: Solen, brass, stainless steel, aluminum, etc.)
If the temperature of the cutting point is lower than the recrystallization temperature, the hardened cut powder is welded on the edge of the blade, causing a configuration blade. It is important to note that if you drop the cutting conditions for vibration and chipping measures, the cutting heat will be reduced and the tip of the configuration is likely to occur. (Temperature in which a metal tissue that is hard and distorted by processing returns by heating)
The higher the affinity of the tool material and the work material (the property of connecting), the more likely it is to generate a configuration blade. In particular, carbide tools with tungsten as the main component have a high affinity with iron, and cut powder can be welded and cause the tip of the configuration blade. Depending on the work material, it is necessary to use the tool material properly.
In order to prevent the occurrence of a configuration blade, the selection of tools and cutting conditions is important.
We will review the selection of tools, such as the sharpness of the tools and the affinity with the work.
A large square and a sharp tool enhance the drainage of the powder to prevent the occurrence of the configurated blade. Generally, the larger the square, the thinner the powder, and the more the drainage is exhausted. Ideally, it is ideal to be more than 30 degrees, but balance is important because the larger the size, the more likely it is to chips and tool damage.
In the case of steel materials, selecting a tool with low affinity with the work material, such as a cotted tool, prevents the occurrence of a configuration blade. In particular, the main component of titanium and tantalty is ideal for finishing steel material because it has a low affinity with iron. For non -ferrous materials such as aluminum, diamond tools such as PCD and CBN with low affinity are used, but it is important to use it according to the processing process because it has high hardness and tends to cause chipping.
Review the cutting conditions such as the cut amount and cutting speed and take measures to prevent it. Adjustment of cutting conditions also affects processing efficiency and finishing quality, so balance is important.
By increasing the cut amount and increasing the cutting temperature than the recrystallization temperature of metal (cutting powder), the tip of the configuration is extinguished. Metal has the property that the temperature of the cutting point rises higher than the recrystallization temperature. (In the case of a steel material, the configuration blade disappears at about 600 ° C.) It is necessary to be careful not to increase the cutting temperature because the tip is softened with low -heat -resistant tools such as highs (high -speed tool steel).
By increasing the lubricity using a coolant, drainage that causes the configurated blade is discharged. In addition, the smaller the friction, the larger the angle, and the thinner the powder. It is important to note that if the cutting temperature is too low, it will lead to the development of a configuration blade.
By increasing the number of revolutions and sending speeds and increasing the temperature of the cutting point, the recrystal of the metal (cut powder) is suppressed and the tip of the configuration is prevented. It is important to note that the tool life increases as the cutting speed increases.
In this article, we explained the cause of the development of the configuration tip in cutting and the countermeasures. The configuration blade is a troublesome phenomenon that occurs not only by a part -time job but also by milling tools and drills. Since the occurrence conditions will vary greatly depending on the work and tool material such as steel, iron, and aluminum, let's take measures to acquire a wide range of metal materials.
