The problem of cutting powder (Kiriko) that cannot be passed in cuts. If you cannot discharge well, you will be able to take appropriate measures because it will lead to poor processing and chocolate stops. In this article, I will explain the trouble of cutting powder in cutting and the countermeasures.
Cutting is a metal "chopping" generated by cutting. From the flour powder to the long connected spiral powder, the shape varies. It is no exaggeration to say that the state of the cut powder varies depending on the processing method and work material, so it is said that the good or bad of the processing can be seen by looking at the cut powder. In general turning processing, "flow -type" cut powder is considered ideal. The following table is a status and characteristics of processing, which is expected for each cut powder shape. It is also possible to judge the quality of processing not only from the shape but also from the color. Since the knife is pressed by pressing the knife while the covered object is rotated during processing, the oxide film generated by pressure and friction causes high heat (cutting fever) causes light rebuilt. The color changes depending on the thickness of the membrane at this time, and in general, when the cutting heat is high, it becomes warm and cold when the temperature is low. In addition, in addition to shapes and colors can be compared, the length is about a few millimeters to a few centimeters, and the number of windings is about 1 to 5 windings.
It is a cut powder that can be used as a material for the processing of processing status, but there are cases where the cut powder itself leads to trouble during processing. For example, the following cases are listed. that cuts the product by wrapping the cut powder around tools and workChatical powder is bitten at the time of work replacement and processing is generated The drill is folded due to clogging clogging during holes
Cutting may be wrapped around tools and work during processing, which may hurt the product. & nbsp; Elements that affect the processing of cutting are mainly chip breakers, nose R, cut angle, cut angle, cut depth, transmitting speed, and coquettable material. Specifically, at the time of application, start with low feed and check the safety and processing surface quality of the chip, then raise the sending to improve the cut -out processing. By making the cuts larger than the nose R, the deflection in the diameter direction of the chip can be minimized. In consideration of these elements, it is important to control the cut powder during processing.
If the cut powder is not drained well, the chicks and shank may be bitten. The bite of the cut powder may be reliably discharged because it causes poor processing and chocolate stops due to alarm.
Care must be taken in hole processing such as inner diameter processing and middle -grained processing, as the powder tends to accumulate in the hole. If cut powder is not excreted well, there is a risk of drilling due to overload. In the case described above, it is necessary to respond to the fact that the generated cut powder is as shorter as possible, and to review and devise elements such as tools and conditions.
The following causes of cutting powder that are likely to cause trouble include the following. Cutting conditions do not meet Large nose R
In a word, there are some cutting conditions, so it is better to make it faster for each material, and it is better to be slower, so there is a debate how to make adjustments. However, when adjusting cutting conditions at the processing site, it is also true that only the rotation speed, sending speed, and cut amount of the main axis can be adjusted. To prevent trouble due to cutting flour Spinning axis rotation speed Sending speed Cutting amount >It is important to balance these three elements. The following are the points to be aware of when adjusting each of the above three elements. If you become aware of the cut powder only, it may affect the quality of the product, so be careful.
Pay attention to the speed of rotation. The speed of rotation is low (slow), and the rate of rotation, which tends to cause poor accuracy, increases (fast) blades, leading to the lack of tools .
Pay attention to the speed of sending speed (slow) Cutting is low (slow), and the transmission speed is likely to cause poor processing, which is likely to cause defective (fast).
Cutting amount is not functioned by the chip breaker with a small cut volume, and the cutlery cannot be controlled.If you cannot solve it above, you will need to review the path and review tools.
If the nose R (the rounded square of the turning chip) is large, the cutting resistance will increase and the drainage of the cut powder will be worse. The size of the nose R also affects the tool life and processing accuracy, so it is necessary to carefully consider it according to the cutting conditions. Generally, the smaller the nose R, the more you can control the cuts than the larger nose R.
If the cutting conditions are good and the cut powder is not excreted well, the tip breaker may not work due to the wear of the tool. It is necessary to properly manage the time to replace the tool.
There are various approaches for cutting powder, which causes poor processing. This section describes the cut powder countermeasures held at the cutting site.
By curling and separating a tool with a chip breaker, it prevents winding on tools and work. The performance of the chip breaker depends greatly on the amount of cut and work material, so it is important to select according to the cutting conditions.
By devising a cutting path and changing the cutting path, you can control the occurrence of cutting powder. For cutting powder, step feed (intermittent processing) during processing and Dwell (NC program delay) are also effective. Depending on the machine tools, some models are equipped with a cutting -powder separation function using vibration.
Eve out a high -pressure coolant and wash off the powder. There are various methods for supplying coolant, but especially for holes such as deep holes, the "center -through system" that erupts a coolant from the tip of the drill is effective.
It is a relatively high cutting condition that coordinates at processing sites are relatively large, Spinning axis rotation speed Sending speed Cutting amount >The common procedures are used for cutting powder measures by adjustment. It is done with the image of repeating 1 to 3. Adjust the rotation speed and sending speed of the main axis that approaches the ideal flow type cut powder.<1>で調整が困難な場合、切り込み量や切削パスを見直しチップブレーカが機能するようなパスに調整を行うIf it is difficult to adjust with & lt; 2 & gt;, select a chip and adjust from ①. By increasing the rotation speed and sending speed of the main axis, the cutting speed is increased, the processing of the processing is reduced, and the cutting temperature is high, so it can be expected to be approached to the ideal flow type cut powder. The load is also large, and if you chip, the cut powder will become a sinking type and a cracked type. If the cutting speed does not improve the drainage of the cutting, review the "cut amount", function with the chip breaker, and divide the cut powder. However, it is necessary to be careful when adjusting, as it will lead to damage to the tool. The above is an example of the adjustment method. If these cutting conditions are not solved, reconsider the cutting path and tool selection.
In this article, we explained the trouble of cutting and the countermeasures. Cutting discharge is a major challenge in cutting. In NC machine tools, which have been automated, how to discharge the cut powder in each process is the key to improving productivity.
