Welding is a phenomenon in which a part of the work dissolved by cutting heat adheres to the tip of the cutting tool. Welding is particularly likely to occur with soft work such as aluminum and soft iron, causing various problems such as deterioration of tool life and poor product. This article explains the causes of welding in cutting and countermeasures.
At the time of cutting, the part where the tool and the work are in contact are high temperature and high pressure. In that environment, the phenomenon in which a part of the cut powder caused by processing adheres to the tool due to physical and chemical factors is "wolf".
Weld is ease of ease of occurrence depending on the work material, making it easier to occur with relatively highly extended aluminum or soft iron. The temperature of welded vary depending on the type of material, but it tends to generate welding when cutting at relatively low speed. On the other hand, if the temperature is too high, welds will be less likely to occur because the welded materials will soften.
The following issues that occur in welded are the following. id = "" that affects tool lifethat leads to major problems such as chipping
The work that is welded on the tool (the tip of the configuration) grows while continuing to cut, and when it grows, it can not maintain the welding state and peels off the tool. At this time, the edge of the tool is peeled off together, affecting the tool life. In addition, the cutting time is increased due to a decrease in cutting properties due to welding, and the increase in wear increases is one of the factors that affect the tool life.
The tip of the configuration generated by welding causes a tool chipping (small chip) when dropping off. Chipping refers to a phenomenon in which the work (covered material) on the tool is peeled off, including the tip of the tool, in addition to vibration and impact. When a chipping occurs, the cutting resistance increases and the finishing surface deteriorates. Care must be taken because small cracks caused by chipping can lead to major problems such as tool damage.
The cut tools are filled with the grooves of the cutting tools, making the cut powder difficult to discharge. Cutting that could not be discharged could be inserted between the tools and the work, and the bitten cut powder could cause poor processing. In addition, cutting powder (composition blade) lounged on the blades repeats growth and dropping, so that the processing accuracy becomes worse due to the changing horns and the horns are changed.
Weld is a phenomenon that is easy to occur when processing soft work such as aluminum and soft iron, which are easily melted due to cutting heat. In addition, it depends on the compatibility between the cutting tool and the work, especially in the case of active combinations that are particularly likely to respond to chemical reactions. The conditions at the time of processing are more likely to occur when the area where the tools and the work are rubbed is large or the drainage is difficult to discharge.
Countermeasures for welds include tool selection and cutting conditions.
The points of selecting tools that are unlikely to occur in welding include scooping surface, scooping horns, coolant methods, tools and coating.
It is important how to discharge cutting powder because the cut powder that occurs during cutting causes welding. In the cutting tool, the surface of the cut powder that generates during cutting is called the surface, and this scooping surface can be selected from the mirror surface to improve the exhaustivity of the powder.
The scooping corner of the cutting tool and the vertical horn of the cutting point are called scooping horns. By increasing the scooping horns, the angle of cutting tools entering the work is small, so the thickness of the cut powder is reduced. Since the cut powder is easier to discharge the thinner, it is possible to increase the drainage exhaust properties by increasing the scooping corner. It is important to note that the larger the square, the lower the strength of the cutting edge.
Weld is more likely to occur when the cutting tool material and the material of the work are active. Therefore, when selecting a tool, it is important to select a work and inactive material. Even if the tool is an active material, coating the tools can reduce the occurrence of welding.
The setting of the cutting condition considering the temperature of the processing path, the cooling point, and the temperature of the cutting point is the point to suppress weld.
In order to suppress weld, selecting a processing path is important. If you select a processing path that causes rubbing like a step processing, welds are more likely to occur due to the effects of the slaps caused by rubbing.
The use of coolant is effective to prevent the cutting point from becoming high. In addition to improving the cooling properties during cutting, the coolant can also improve the lubricity, so that it is possible to efficiently discharge the generated cutting powder. In order to suppress the welding during cutting, the cooling of the cutting point is greatly effective.
Suppressing the temperature rise at the pointing point and keeping it constant is also effective in suppressing welding. Increasing the cutting speed (rotation speed) and sending speed will lead to an increase in temperature, so it is a good idea to optimize the speed of the cutting point so that the temperature does not rise.
In this article, we explained the causes of welding in cutting processing and the countermeasures. In order to prevent welding, it is important to know the characteristics of the material and the compatibility with the tools and select the optimal cutting tools such as coating tools. Let's take measures in conjunction with the prevention of the configurated blade.
