What are the three structures of the working part of the profiled blade?

The working part of the cutting tool is the part that generates and processes the chip, including the blade, the structure that makes the chip broken or rolled up, the space for chip removal or storage, the channel of cutting fluid and so on. The working part of some cutting tools is the cutting part, such as turning tool, planer, boring cutter and milling cutter; while the working part of some cutting tools includes cutting part and calibration part, such as drill, reamer, inner surface broach and tap, etc. The function of the cutting part is to remove the chip with the cutting edge, and the function of the calibration part is to polish the machined surface and guide the tool.
There are three kinds of special-shaped clamping and welding structure. The overall structure is to make cutting edge on the cutter body; the welding structure is to braze the blade to the steel knife body; there are two mechanical clamping structures, one is to clamp the blade to the cutter body, and the other is to clamp the brazed cutter head on the cutter body. Cemented carbide tools are generally made of welding structure or mechanical clamping structure; ceramic cutting tools are mechanically clamped structure.
The geometric parameters of the cutting part of the special-shaped blade have a great influence on the cutting efficiency and machining quality. Increasing the rake angle can reduce the plastic deformation of the cutting layer and the friction resistance of the chip flowing through the front, thus reducing the cutting force and cutting heat. However, with the increase of rake angle, the strength of cutting edge will be reduced and the heat dissipation volume of cutter head will be reduced.
There are two kinds of clamping parts of the film with holes and handles. The special-shaped blade is set on the spindle or spindle of the machine tool through the inner hole, and transmits the torsional torque of the circular blade by means of the axial key or end key, such as cylindrical milling cutter, sleeve surface milling cutter, etc.
There are usually three kinds of special-shaped blades: rectangular handle, cylindrical handle and conical handle. Generally, the taper shank bears the axial thrust and transmits the torque by friction; the cylindrical shank is generally suitable for small twist drills and end mills, and the torsion moment is transmitted by the friction force generated during clamping. The handle of many tools with handles is made of low-alloy steel, while the working part is made of high-speed round blade steel by butt welding the two parts.