In order to improve the efficiency of CNC turning workpieces, it is crucial to select the blade, especially the arc size of the blade edge.
As we all know, cutting time is inversely proportional to the amount of tool feed. In order to shorten the cutting time, an insert with a large cutting edge arc should be used when possible.
It is recommended to use round inserts when cutting flat surfaces of workpieces such as inner and outer circles without steps.
The photo below shows a φ12 single-sided circular blade.
picture
for example. A certain outer surface is required to be turned to a roughness of 6.4.
If an R1.2 80-degree or 55-degree or triangular blade is used for turning, the tool feed should not be greater than 0.174mm per revolution (see Figure 1).
picture
If you use φ10 circular blade turning instead, the tool feed amount can be no more than 0.452mm (see Figure 2).
picture
Compared with inserts using R1.2, the cutting speed to achieve the same roughness can be accelerated to 2.6 times, that is, the cutting efficiency is increased to 2.6 times.
Another advantage of using a round blade is that it has a cutting edge all around and can be indexed and reused after wear, which can greatly save the cost of blade consumption.
The cutting force of round inserts is large, which requires high rigidity of machine tools and process systems. There is no doubt that CNC lathes, especially full-function CNC lathes, are very rigid.
We found that the use of round blades abroad is much more than the use of original blades in China.
We have seen in Japanese companies that they also use round blades when rough turning flat surfaces of workpieces. So why don't we dare to use round inserts when finishing the flat surface of the workpiece?
When using round blades, attention should be paid to the rigidity of the clamp. Not all situations can use round blades. For example, if the workpiece has a stepped surface, you cannot use a round blade. Round blades are also not suitable for turning thin-walled parts or slender shafts.
