The surface of the cut -off product is high, depth and depth that can not be seen visually even if it looks flat, and mountains and valleys with different intervals. This continuous small undulation is called "surface roughness". In recent years, it has been demanding miniaturization and sophistication of industrial products, and high -precision processing and finishing are required for the parts. This article explains the cause of deterioration of surface roughness in cutting and countermeasures.
The deterioration of the surface roughness occurs, such as the generation of frictional resistance, the deterioration of airtightness and oil density, and the glossy on the cutting surface. I will explain each issue.
If metals are combined, large surface roughness may cause frictional resistance on the surface, which may hinder the sliding (slip) of the machine. In addition, the gap between the combined metals increases, and the airtightness and oil dust deteriorate.
If you polish the metal smoothly, the metal gloss will occur. On the other hand, if the surface roughness at the time of cutting is large, the metallic luster will be lost, resulting in a rough texture. It may be processed for a rough texture, but it is often important to note that the appearance will deteriorate due to the surface roughness.
If the dimensional accuracy is strict and is not inside the tolerance during cutting, it is necessary to perform additional work. However, if the surface roughness is too large, the cost of improving the roughness will be lost, which will result in poor processing.
Here are three main factors in which the surface roughness deteriorates in the finishing process of cutting. If a configuration tip is generated in the cutting tool, the configuration blade tip will repeat growth and dropping as the cutting process is promoted, and each time the sculpture changes, the surface roughness will worsen. If the cutting tools are worn and the sharpness becomes worse, the finishing tools are worn, so that the set sculpture horns cannot be realized, or the surface nature of the worn tools is transferred to the material, and the surface roughness is transcribed to the material. Will get worse. If the cutting condition is not appropriate, the surface roughness will deteriorate if the cutting condition of the finishing process is not appropriate, such as the amount of cutting tools.
In order to prevent the surface roughness deterioration, it is necessary to take measures in the selection of cutting tools and setting conditions at the time of cutting.
Countermeasures by selecting tools include how to coat the surface of the tool, selection of tools and wiper inserts with large scooping corners of inserted corner R.
In order to suppress the occurrence of the configuration tip that causes the surface roughness, selecting a coated tool is effective. The constituent blade tip changes the ease of generating to the combination of cutting tools and work, so it is difficult to generate by coating. If the occurrence of the configuration edge is suppressed, it is possible to prevent the surface roughness from deteriorating.
By reducing the Ca with a smaller, the resistance at the time of cutting can be suppressed and the surface roughness can be deteriorated. By increasing the square horns, it is possible to suppress the wear of tools that lead to deterioration of surface roughness.
Normally, the surface roughness will deteriorate if the amount of sending is large, but the use of a wiper insert with a wiper blade can reduce the deterioration of the surface roughness even if the amount of sending is large. In addition, if the amount of sending is large, the wear of the cutting tool will be suppressed, and the life of the tool can be extended.
To prevent the surface roughness, the points that should be kept under cutting conditions are "smaller amount" and "cooling the cutting point".
If the amount of sending is increased, the processing amount per blade will increase, and the surface roughness will worsen. On the other hand, reducing the amount of sending is possible, enabling high -precision processing, reducing the deterioration of the surface roughness. However, since the processing speed is slower, it is necessary to consider that it does not affect productivity.
The configuration tip that has a negative effect on the surface roughness is more likely to occur when the temperature of the cutting point rises. By using a coolant, in addition to suppressing the rise in temperature, the lubricity can be improved, so that the surface roughness can be prevented.
In this article, we explained the cause of the surface roughness in cutting processing and the countermeasures. The surface roughness not only has good or bad dimension accuracy, but also leads to the performance of machine parts, such as sliding and durability due to friction. Let's control the surface roughness and aim for high -value -added manufacturing.
