The cutting knife should be used for cutting. The shape of the cutting knife is similar to that of the grooving knife, but the knife head is narrow and the dagger is easy to break. Cutting knives include high-speed steel cutting knives, cemented carbide cutting knives, elastic cutting knives, reverse cutting knives and other types.
There are several cutting methods for CNC lathe:
1. Straight forward method
The cutter feeds perpendicular to the axis of the workpiece. This method has high efficiency, but it has high requirements for the grinding and clamping of lathe and cutting knife, otherwise it is easy to break the knife head.
2. Left and right knife borrowing method
In the case of insufficient rigidity of cutting tools, workpieces and lathes, the tool borrowing method can be used to cut off workpieces. This method means that the cutter moves back and forth repeatedly in the axis direction, and then feeds radially on both sides until the workpiece is cut off.
3. Reverse tangent method
The reverse cutting method refers to the reverse clamping of the workpiece and the turning tool. This cutting method is suitable for cutting workpieces with large diameter. Its advantages are: because the cutting force acting on the workpiece is consistent with the gravity direction of the spindle (downward), the spindle is not easy to jump up and down, it is relatively stable when cutting the workpiece, and the chips are discharged downward, which will not be blocked in the cutting groove, and the chip removal is smooth.