Turning is one of the cutting processing that fixes tools and rotates the work while rotating the work. It is used when processing cylindrical parts such as bolts and shaft parts using machine tools such as CNC lathes. In this article, we will explain the tasks for turning over and the points you want to keep in order to perform efficient turning.
The following tasks that occur during turning are as follows. Cutting of cut powder Processing due to chattering Tip
In the turning process, the cut powder generated during the processing cannot be processed and excreted, and the rotating work involves the cut powder, which leads to damage to the work and the cutting tool.
In turning processing, intermittent vibration may cause chattering. For chattering, it can be classified as "forced vibration", which is a vibration source for the machine body and external environment, and "self -encouraging chattering", which is a vibration source of tools and work processing points. When a chattering is generated, a scaled scale called "Vibiri Mark" occurs on the finish of the work, causing poor processing.
Chipping is a small chip that occurs at the edge of the tool. In the turning process, the cutting resistance is high and the finish of the work deteriorates by continuing to process with chipping on the edge of the tool. It becomes a glossy finish like a pear, and it becomes a poor processing.
This section describes measures to solve tasks such as cutting powder involvement, poor processing due to chattering, tool chipping and wear that occur when turning.
Countermeasures to prevent the entanglement of cut powder include swinging cutting, adjusting the amount of cuts and sending amounts, and selecting a small nose R chip.
By using a swinging cut to vibrate the tool finely, it is possible to divide the cut powder at the time of turning. By dividing the cut powder, the cut powder makes it difficult to get caught in the work.
On the scooping surface of the tool, there is a groove and protrusion called "chip breaker" for dividing cut powder. If you have a chip breaker, you can not divide the cut powder under any processing conditions. By setting the cut amount and sending amount of the tool according to the shape of the chip breaker, the cut powder can be effectively divided.
By selecting a small chip, the "nose R", which is the rounded corner of the turning tool, can reduce the cutting resistance and improve the sharpness. If the nose R is reduced, the strength of the chip will decrease, so it is important to select a tip of as small as possible while taking into account the load during cutting.
In order to prevent the processing of poor processing due to chattering, it is effective to adjust the cutting amount and cutting conditions, select a small nose R chip, and coat tip coating.
In order to suppress the occurrence of chattering, it is necessary to reduce the size of the cutting resistance and adjust the cut amount and cutting conditions in consideration of the direction. By setting the rotation speed of the work slower, setting the amount of sending and cut amounts that do not generate chattering can reduce the processing of processing due to vibeling.
Chattering is more likely to occur as the cutting resistance increases. Therefore, by selecting a small tip of the nose R, it is possible to reduce the cutting resistance and suppress the generation of chattering. Since small tips of nose R may be insufficient, it is necessary to consider the relationship between cutting conditions and the hardness between chips and work.
It is effective to consider chip coating to reduce cutting resistance. By selecting a thin film coating or non -coat, it is possible to reduce the cutting resistance, reducing the chattering.
In order to prevent chipping and wear of the edge of the blade, it is effective to consider the classification of wear and lower the cutting conditions and cutting temperature.
The wear of the edge of the blade can be classified into multiple wear, such as crater wear and frank wear (escape surface wear). Since measures are different for each wear characteristics, it is important to consider what kind of wear is generated and the classification of wear.
In order to reduce the cutting temperature that causes chipping, it is effective to lower the cutting conditions such as the amount of sending. In addition, by selecting a Surukurant holder that can directly deliver the coolant to the processing point, the welding and configuration tips that cause chipping can be reduced.
Processing of high -hardware materials may increase the cutting resistance and residual stress that is constantly generated during cutting, and the work may be greatly deformed. Therefore, when deciding the process design and clamp method for cutting, it is necessary to consider the cutting resistance and residual stress. If the clamp is strong, the work may be deformed when the clamp is removed, so it is necessary to select a clamp in consideration of deformation.
In this article, we explain the issues generated by turning and the points you want to keep for efficient turning. Turning processing is the basic processing of metal processing. Even with automatic processing with CNC lathes, it is important to have knowledge of metal material and to select tools in order to eliminate processing defects and increase the yield.
