Apr 25, 2019
The cutting part of the turning tool is composed of a main cutting edge, a minor cutting edge, a rake face, a main flank face and a minor flank face, and a cutting edge angle. The combination of the cutting portion of the turning tool and the handle (ie, the clamping portion) is mainly integrated, welded, mechanically clamped, and welded-mechanically clamped. The mechanically clamped turning tool prevents stress and cracking of the carbide insert during high temperature welding, and the tool holder can be used multiple times. Mechanically clamped turning tools are generally mechanically clamped turning tools that clamp the insert with screws and pressure plates and are equipped with indexable inserts. After the blade is blunt, it can be used for indexing and the parking time is short, so it has developed rapidly.
The cutting portion of the turning tool is composed of a main cutting edge, a minor cutting edge, a rake face, a flank face and a minor flank face. Its geometry is determined by the rake angle γo, the relief angle αo, the main declination κr, the rake angle γS, the secondary declination κr', and the radius of the tool nose arc rε. The choice of turning tool geometry parameters is influenced by many factors and must be selected according to the specific situation. The rake angle γo is selected according to the composition and strength of the workpiece material, and a smaller value should be taken when cutting the material with higher strength. For example, carbide turning tools are cutting
The carbon steel has a rake angle of 10° to 15°; when cutting chrome-manganese steel or hardened steel, it takes -2° to -10°. Under normal circumstances, the back angle is 6 ° ~ 10 °. The lead angle κr is determined according to the rigidity condition of the process system, generally takes 30° to 75°, and takes a larger value when the rigidity is poor. When the stepped shaft is used, the cutting method needs to be greater than or equal to 90°. The tool nose radius rε and the secondary declination κr' are generally selected according to the requirements of the surface roughness of the machined surface. The blade inclination angle γS is determined according to the required chip removal direction and blade strength. The type of the front of the turning tool (Fig. 2) is mainly determined by the nature of the workpiece material and the tool material. The simplest type is the flat type, and the front type of the front angle is suitable for high-speed steel turning tools and carbide turning tools for finishing.