The cutting part of the turning tool is composed of the main cutting edge, the secondary cutting edge, the front, the rear and the secondary rear, etc. The type of turning tool in front is mainly determined by the nature of the workpiece material and the tool material. The flat type with negative rake angle is suitable for carbide turning tools for machining high-strength steel and rough-cut steel castings. The planar type with chamfering is a negative chamfer ground on the positive rake angle plane to improve the strength of the cutting edge, and is suitable for machining cemented carbide turning tools for cast iron and general steel. For turning tools that require chip breaking, a rounded face type with negative chamfering can be used, or a chip breaker can be ground on the front surface of a flat type. Turning tools can be divided into outer circle, shoulder, end face, grooving, parting, threading and forming turning tools according to their use. There are also turning tools for automatic lines and digitally controlled machines. A turning tool or a lathe tool, a tool installed on a lathe to cut metallic materials. Turning tools are divided into, high-speed steel turning tools, ceramic tools, cemented carbide turning tools, cubic boron nitride turning tools, etc.
